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fs/namei.c
82.6 KB
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/* * linux/fs/namei.c * * Copyright (C) 1991, 1992 Linus Torvalds */ /* * Some corrections by tytso. */ /* [Feb 1997 T. Schoebel-Theuer] Complete rewrite of the pathname * lookup logic. */ /* [Feb-Apr 2000, AV] Rewrite to the new namespace architecture. */ #include <linux/init.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/fs.h> #include <linux/namei.h> |
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#include <linux/pagemap.h> |
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#include <linux/fsnotify.h> |
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#include <linux/personality.h> #include <linux/security.h> |
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#include <linux/ima.h> |
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#include <linux/syscalls.h> #include <linux/mount.h> #include <linux/audit.h> |
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#include <linux/capability.h> |
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#include <linux/file.h> |
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#include <linux/fcntl.h> |
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#include <linux/device_cgroup.h> |
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#include <linux/fs_struct.h> |
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#include <linux/posix_acl.h> |
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#include <asm/uaccess.h> |
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#include "internal.h" |
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#include "mount.h" |
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|
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/* [Feb-1997 T. Schoebel-Theuer] * Fundamental changes in the pathname lookup mechanisms (namei) * were necessary because of omirr. The reason is that omirr needs * to know the _real_ pathname, not the user-supplied one, in case * of symlinks (and also when transname replacements occur). * * The new code replaces the old recursive symlink resolution with * an iterative one (in case of non-nested symlink chains). It does * this with calls to <fs>_follow_link(). * As a side effect, dir_namei(), _namei() and follow_link() are now * replaced with a single function lookup_dentry() that can handle all * the special cases of the former code. * * With the new dcache, the pathname is stored at each inode, at least as * long as the refcount of the inode is positive. As a side effect, the * size of the dcache depends on the inode cache and thus is dynamic. * * [29-Apr-1998 C. Scott Ananian] Updated above description of symlink * resolution to correspond with current state of the code. * * Note that the symlink resolution is not *completely* iterative. * There is still a significant amount of tail- and mid- recursion in * the algorithm. Also, note that <fs>_readlink() is not used in * lookup_dentry(): lookup_dentry() on the result of <fs>_readlink() * may return different results than <fs>_follow_link(). Many virtual * filesystems (including /proc) exhibit this behavior. */ /* [24-Feb-97 T. Schoebel-Theuer] Side effects caused by new implementation: * New symlink semantics: when open() is called with flags O_CREAT | O_EXCL * and the name already exists in form of a symlink, try to create the new * name indicated by the symlink. The old code always complained that the * name already exists, due to not following the symlink even if its target * is nonexistent. The new semantics affects also mknod() and link() when |
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* the name is a symlink pointing to a non-existent name. |
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* * I don't know which semantics is the right one, since I have no access * to standards. But I found by trial that HP-UX 9.0 has the full "new" * semantics implemented, while SunOS 4.1.1 and Solaris (SunOS 5.4) have the * "old" one. Personally, I think the new semantics is much more logical. * Note that "ln old new" where "new" is a symlink pointing to a non-existing * file does succeed in both HP-UX and SunOs, but not in Solaris * and in the old Linux semantics. */ /* [16-Dec-97 Kevin Buhr] For security reasons, we change some symlink * semantics. See the comments in "open_namei" and "do_link" below. * * [10-Sep-98 Alan Modra] Another symlink change. */ /* [Feb-Apr 2000 AV] Complete rewrite. Rules for symlinks: * inside the path - always follow. * in the last component in creation/removal/renaming - never follow. * if LOOKUP_FOLLOW passed - follow. * if the pathname has trailing slashes - follow. * otherwise - don't follow. * (applied in that order). * * [Jun 2000 AV] Inconsistent behaviour of open() in case if flags==O_CREAT * restored for 2.4. This is the last surviving part of old 4.2BSD bug. * During the 2.4 we need to fix the userland stuff depending on it - * hopefully we will be able to get rid of that wart in 2.5. So far only * XEmacs seems to be relying on it... */ /* * [Sep 2001 AV] Single-semaphore locking scheme (kudos to David Holland) |
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* implemented. Let's see if raised priority of ->s_vfs_rename_mutex gives |
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* any extra contention... */ /* In order to reduce some races, while at the same time doing additional * checking and hopefully speeding things up, we copy filenames to the * kernel data space before using them.. * * POSIX.1 2.4: an empty pathname is invalid (ENOENT). * PATH_MAX includes the nul terminator --RR. */ |
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static int do_getname(const char __user *filename, char *page) |
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{ int retval; unsigned long len = PATH_MAX; if (!segment_eq(get_fs(), KERNEL_DS)) { if ((unsigned long) filename >= TASK_SIZE) return -EFAULT; if (TASK_SIZE - (unsigned long) filename < PATH_MAX) len = TASK_SIZE - (unsigned long) filename; } retval = strncpy_from_user(page, filename, len); if (retval > 0) { if (retval < len) return 0; return -ENAMETOOLONG; } else if (!retval) retval = -ENOENT; return retval; } |
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static char *getname_flags(const char __user *filename, int flags, int *empty) |
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{ char *tmp, *result; result = ERR_PTR(-ENOMEM); tmp = __getname(); if (tmp) { int retval = do_getname(filename, tmp); result = tmp; if (retval < 0) { |
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if (retval == -ENOENT && empty) *empty = 1; |
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if (retval != -ENOENT || !(flags & LOOKUP_EMPTY)) { __putname(tmp); result = ERR_PTR(retval); } |
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} } audit_getname(result); return result; } |
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char *getname(const char __user * filename) { |
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return getname_flags(filename, 0, 0); |
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} |
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#ifdef CONFIG_AUDITSYSCALL void putname(const char *name) { |
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if (unlikely(!audit_dummy_context())) |
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audit_putname(name); else __putname(name); } EXPORT_SYMBOL(putname); #endif |
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static int check_acl(struct inode *inode, int mask) { |
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#ifdef CONFIG_FS_POSIX_ACL |
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struct posix_acl *acl; |
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if (mask & MAY_NOT_BLOCK) { |
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acl = get_cached_acl_rcu(inode, ACL_TYPE_ACCESS); if (!acl) |
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return -EAGAIN; |
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/* no ->get_acl() calls in RCU mode... */ if (acl == ACL_NOT_CACHED) return -ECHILD; |
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return posix_acl_permission(inode, acl, mask & ~MAY_NOT_BLOCK); |
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} acl = get_cached_acl(inode, ACL_TYPE_ACCESS); /* |
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* A filesystem can force a ACL callback by just never filling the * ACL cache. But normally you'd fill the cache either at inode * instantiation time, or on the first ->get_acl call. |
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* |
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* If the filesystem doesn't have a get_acl() function at all, we'll * just create the negative cache entry. |
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*/ if (acl == ACL_NOT_CACHED) { |
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if (inode->i_op->get_acl) { acl = inode->i_op->get_acl(inode, ACL_TYPE_ACCESS); if (IS_ERR(acl)) return PTR_ERR(acl); } else { set_cached_acl(inode, ACL_TYPE_ACCESS, NULL); return -EAGAIN; } |
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} if (acl) { int error = posix_acl_permission(inode, acl, mask); posix_acl_release(acl); return error; } |
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#endif |
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return -EAGAIN; } |
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/* |
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* This does the basic permission checking |
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*/ |
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static int acl_permission_check(struct inode *inode, int mask) |
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{ |
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unsigned int mode = inode->i_mode; |
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|
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if (current_user_ns() != inode_userns(inode)) goto other_perms; |
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if (likely(current_fsuid() == inode->i_uid)) |
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mode >>= 6; else { |
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if (IS_POSIXACL(inode) && (mode & S_IRWXG)) { |
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int error = check_acl(inode, mask); |
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if (error != -EAGAIN) return error; |
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} if (in_group_p(inode->i_gid)) mode >>= 3; } |
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other_perms: |
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/* * If the DACs are ok we don't need any capability check. */ |
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if ((mask & ~mode & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
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return 0; |
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return -EACCES; } /** |
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* generic_permission - check for access rights on a Posix-like filesystem |
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* @inode: inode to check access rights for |
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* @mask: right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC, ...) |
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* * Used to check for read/write/execute permissions on a file. * We use "fsuid" for this, letting us set arbitrary permissions * for filesystem access without changing the "normal" uids which |
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* are used for other things. * * generic_permission is rcu-walk aware. It returns -ECHILD in case an rcu-walk * request cannot be satisfied (eg. requires blocking or too much complexity). * It would then be called again in ref-walk mode. |
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*/ |
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int generic_permission(struct inode *inode, int mask) |
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{ int ret; /* |
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* Do the basic permission checks. |
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*/ |
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ret = acl_permission_check(inode, mask); |
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if (ret != -EACCES) return ret; |
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|
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if (S_ISDIR(inode->i_mode)) { /* DACs are overridable for directories */ if (ns_capable(inode_userns(inode), CAP_DAC_OVERRIDE)) return 0; if (!(mask & MAY_WRITE)) if (ns_capable(inode_userns(inode), CAP_DAC_READ_SEARCH)) return 0; return -EACCES; } |
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/* * Read/write DACs are always overridable. |
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* Executable DACs are overridable when there is * at least one exec bit set. |
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*/ |
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if (!(mask & MAY_EXEC) || (inode->i_mode & S_IXUGO)) |
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if (ns_capable(inode_userns(inode), CAP_DAC_OVERRIDE)) |
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return 0; /* * Searching includes executable on directories, else just read. */ |
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mask &= MAY_READ | MAY_WRITE | MAY_EXEC; |
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if (mask == MAY_READ) |
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if (ns_capable(inode_userns(inode), CAP_DAC_READ_SEARCH)) |
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return 0; return -EACCES; } |
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/* * We _really_ want to just do "generic_permission()" without * even looking at the inode->i_op values. So we keep a cache * flag in inode->i_opflags, that says "this has not special * permission function, use the fast case". */ static inline int do_inode_permission(struct inode *inode, int mask) { if (unlikely(!(inode->i_opflags & IOP_FASTPERM))) { if (likely(inode->i_op->permission)) return inode->i_op->permission(inode, mask); /* This gets set once for the inode lifetime */ spin_lock(&inode->i_lock); inode->i_opflags |= IOP_FASTPERM; spin_unlock(&inode->i_lock); } return generic_permission(inode, mask); } |
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/** * inode_permission - check for access rights to a given inode * @inode: inode to check permission on |
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* @mask: right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC, ...) |
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* * Used to check for read/write/execute permissions on an inode. * We use "fsuid" for this, letting us set arbitrary permissions * for filesystem access without changing the "normal" uids which * are used for other things. |
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* * When checking for MAY_APPEND, MAY_WRITE must also be set in @mask. |
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*/ |
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int inode_permission(struct inode *inode, int mask) |
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{ |
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int retval; |
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|
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if (unlikely(mask & MAY_WRITE)) { |
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umode_t mode = inode->i_mode; |
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/* * Nobody gets write access to a read-only fs. */ if (IS_RDONLY(inode) && (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) return -EROFS; /* * Nobody gets write access to an immutable file. */ if (IS_IMMUTABLE(inode)) return -EACCES; } |
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retval = do_inode_permission(inode, mask); |
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if (retval) return retval; |
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retval = devcgroup_inode_permission(inode, mask); if (retval) return retval; |
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return security_inode_permission(inode, mask); |
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} |
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/** |
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* path_get - get a reference to a path * @path: path to get the reference to * * Given a path increment the reference count to the dentry and the vfsmount. */ void path_get(struct path *path) { mntget(path->mnt); dget(path->dentry); } EXPORT_SYMBOL(path_get); /** |
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* path_put - put a reference to a path * @path: path to put the reference to * * Given a path decrement the reference count to the dentry and the vfsmount. */ void path_put(struct path *path) |
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{ |
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dput(path->dentry); mntput(path->mnt); |
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} |
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EXPORT_SYMBOL(path_put); |
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|
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/* |
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* Path walking has 2 modes, rcu-walk and ref-walk (see |
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* Documentation/filesystems/path-lookup.txt). In situations when we can't * continue in RCU mode, we attempt to drop out of rcu-walk mode and grab * normal reference counts on dentries and vfsmounts to transition to rcu-walk * mode. Refcounts are grabbed at the last known good point before rcu-walk * got stuck, so ref-walk may continue from there. If this is not successful * (eg. a seqcount has changed), then failure is returned and it's up to caller * to restart the path walk from the beginning in ref-walk mode. |
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*/ |
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/** |
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* unlazy_walk - try to switch to ref-walk mode. * @nd: nameidata pathwalk data * @dentry: child of nd->path.dentry or NULL |
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* Returns: 0 on success, -ECHILD on failure |
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* |
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* unlazy_walk attempts to legitimize the current nd->path, nd->root and dentry * for ref-walk mode. @dentry must be a path found by a do_lookup call on * @nd or NULL. Must be called from rcu-walk context. |
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*/ |
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static int unlazy_walk(struct nameidata *nd, struct dentry *dentry) |
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{ struct fs_struct *fs = current->fs; struct dentry *parent = nd->path.dentry; |
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int want_root = 0; |
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BUG_ON(!(nd->flags & LOOKUP_RCU)); |
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if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) { want_root = 1; |
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spin_lock(&fs->lock); if (nd->root.mnt != fs->root.mnt || nd->root.dentry != fs->root.dentry) goto err_root; } spin_lock(&parent->d_lock); |
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if (!dentry) { if (!__d_rcu_to_refcount(parent, nd->seq)) goto err_parent; BUG_ON(nd->inode != parent->d_inode); } else { |
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if (dentry->d_parent != parent) goto err_parent; |
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spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED); if (!__d_rcu_to_refcount(dentry, nd->seq)) goto err_child; /* * If the sequence check on the child dentry passed, then * the child has not been removed from its parent. This * means the parent dentry must be valid and able to take * a reference at this point. */ BUG_ON(!IS_ROOT(dentry) && dentry->d_parent != parent); BUG_ON(!parent->d_count); parent->d_count++; spin_unlock(&dentry->d_lock); } |
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spin_unlock(&parent->d_lock); |
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if (want_root) { |
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path_get(&nd->root); spin_unlock(&fs->lock); } mntget(nd->path.mnt); rcu_read_unlock(); br_read_unlock(vfsmount_lock); nd->flags &= ~LOOKUP_RCU; return 0; |
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err_child: |
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spin_unlock(&dentry->d_lock); |
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err_parent: |
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spin_unlock(&parent->d_lock); err_root: |
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if (want_root) |
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spin_unlock(&fs->lock); return -ECHILD; } |
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/** |
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* release_open_intent - free up open intent resources * @nd: pointer to nameidata */ void release_open_intent(struct nameidata *nd) { |
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struct file *file = nd->intent.open.file; if (file && !IS_ERR(file)) { if (file->f_path.dentry == NULL) put_filp(file); else fput(file); } |
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} |
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static inline int d_revalidate(struct dentry *dentry, struct nameidata *nd) |
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{ |
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return dentry->d_op->d_revalidate(dentry, nd); |
34286d666 fs: rcu-walk awar... |
483 |
} |
9f1fafee9 merge handle_reva... |
484 485 486 |
/** * complete_walk - successful completion of path walk * @nd: pointer nameidata |
39159de2a vfs: force reval ... |
487 |
* |
9f1fafee9 merge handle_reva... |
488 489 490 491 492 |
* If we had been in RCU mode, drop out of it and legitimize nd->path. * Revalidate the final result, unless we'd already done that during * the path walk or the filesystem doesn't ask for it. Return 0 on * success, -error on failure. In case of failure caller does not * need to drop nd->path. |
39159de2a vfs: force reval ... |
493 |
*/ |
9f1fafee9 merge handle_reva... |
494 |
static int complete_walk(struct nameidata *nd) |
39159de2a vfs: force reval ... |
495 |
{ |
16c2cd717 untangle the "nee... |
496 |
struct dentry *dentry = nd->path.dentry; |
39159de2a vfs: force reval ... |
497 |
int status; |
39159de2a vfs: force reval ... |
498 |
|
9f1fafee9 merge handle_reva... |
499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 |
if (nd->flags & LOOKUP_RCU) { nd->flags &= ~LOOKUP_RCU; if (!(nd->flags & LOOKUP_ROOT)) nd->root.mnt = NULL; spin_lock(&dentry->d_lock); if (unlikely(!__d_rcu_to_refcount(dentry, nd->seq))) { spin_unlock(&dentry->d_lock); rcu_read_unlock(); br_read_unlock(vfsmount_lock); return -ECHILD; } BUG_ON(nd->inode != dentry->d_inode); spin_unlock(&dentry->d_lock); mntget(nd->path.mnt); rcu_read_unlock(); br_read_unlock(vfsmount_lock); } |
16c2cd717 untangle the "nee... |
516 517 518 519 |
if (likely(!(nd->flags & LOOKUP_JUMPED))) return 0; if (likely(!(dentry->d_flags & DCACHE_OP_REVALIDATE))) |
39159de2a vfs: force reval ... |
520 |
return 0; |
16c2cd717 untangle the "nee... |
521 522 523 524 |
if (likely(!(dentry->d_sb->s_type->fs_flags & FS_REVAL_DOT))) return 0; /* Note: we do not d_invalidate() */ |
34286d666 fs: rcu-walk awar... |
525 |
status = d_revalidate(dentry, nd); |
39159de2a vfs: force reval ... |
526 527 |
if (status > 0) return 0; |
16c2cd717 untangle the "nee... |
528 |
if (!status) |
39159de2a vfs: force reval ... |
529 |
status = -ESTALE; |
16c2cd717 untangle the "nee... |
530 |
|
9f1fafee9 merge handle_reva... |
531 |
path_put(&nd->path); |
39159de2a vfs: force reval ... |
532 533 |
return status; } |
2a7378711 Cache root in nam... |
534 535 |
static __always_inline void set_root(struct nameidata *nd) { |
f7ad3c6be vfs: add helpers ... |
536 537 |
if (!nd->root.mnt) get_fs_root(current->fs, &nd->root); |
2a7378711 Cache root in nam... |
538 |
} |
6de88d729 kill __link_path_... |
539 |
static int link_path_walk(const char *, struct nameidata *); |
31e6b01f4 fs: rcu-walk for ... |
540 541 542 543 |
static __always_inline void set_root_rcu(struct nameidata *nd) { if (!nd->root.mnt) { struct fs_struct *fs = current->fs; |
c28cc3646 fs: fs_struct use... |
544 545 546 547 548 |
unsigned seq; do { seq = read_seqcount_begin(&fs->seq); nd->root = fs->root; |
c1530019e vfs: Fix absolute... |
549 |
nd->seq = __read_seqcount_begin(&nd->root.dentry->d_seq); |
c28cc3646 fs: fs_struct use... |
550 |
} while (read_seqcount_retry(&fs->seq, seq)); |
31e6b01f4 fs: rcu-walk for ... |
551 552 |
} } |
f16623569 [PATCH] Mark some... |
553 |
static __always_inline int __vfs_follow_link(struct nameidata *nd, const char *link) |
1da177e4c Linux-2.6.12-rc2 |
554 |
{ |
31e6b01f4 fs: rcu-walk for ... |
555 |
int ret; |
1da177e4c Linux-2.6.12-rc2 |
556 557 558 559 |
if (IS_ERR(link)) goto fail; if (*link == '/') { |
2a7378711 Cache root in nam... |
560 |
set_root(nd); |
1d957f9bf Introduce path_put() |
561 |
path_put(&nd->path); |
2a7378711 Cache root in nam... |
562 563 |
nd->path = nd->root; path_get(&nd->root); |
16c2cd717 untangle the "nee... |
564 |
nd->flags |= LOOKUP_JUMPED; |
1da177e4c Linux-2.6.12-rc2 |
565 |
} |
31e6b01f4 fs: rcu-walk for ... |
566 |
nd->inode = nd->path.dentry->d_inode; |
b4091d5f6 kill walk_init_root |
567 |
|
31e6b01f4 fs: rcu-walk for ... |
568 569 |
ret = link_path_walk(link, nd); return ret; |
1da177e4c Linux-2.6.12-rc2 |
570 |
fail: |
1d957f9bf Introduce path_put() |
571 |
path_put(&nd->path); |
1da177e4c Linux-2.6.12-rc2 |
572 573 |
return PTR_ERR(link); } |
1d957f9bf Introduce path_put() |
574 |
static void path_put_conditional(struct path *path, struct nameidata *nd) |
051d38125 [PATCH] autofs4: ... |
575 576 |
{ dput(path->dentry); |
4ac913785 Embed a struct pa... |
577 |
if (path->mnt != nd->path.mnt) |
051d38125 [PATCH] autofs4: ... |
578 579 |
mntput(path->mnt); } |
7b9337aaf fs: namei fix ->p... |
580 581 |
static inline void path_to_nameidata(const struct path *path, struct nameidata *nd) |
051d38125 [PATCH] autofs4: ... |
582 |
{ |
31e6b01f4 fs: rcu-walk for ... |
583 584 585 586 |
if (!(nd->flags & LOOKUP_RCU)) { dput(nd->path.dentry); if (nd->path.mnt != path->mnt) mntput(nd->path.mnt); |
9a2296832 namei.c : update ... |
587 |
} |
31e6b01f4 fs: rcu-walk for ... |
588 |
nd->path.mnt = path->mnt; |
4ac913785 Embed a struct pa... |
589 |
nd->path.dentry = path->dentry; |
051d38125 [PATCH] autofs4: ... |
590 |
} |
574197e0d tidy the trailing... |
591 592 593 594 595 596 597 |
static inline void put_link(struct nameidata *nd, struct path *link, void *cookie) { struct inode *inode = link->dentry->d_inode; if (!IS_ERR(cookie) && inode->i_op->put_link) inode->i_op->put_link(link->dentry, nd, cookie); path_put(link); } |
def4af30c Get rid of symlin... |
598 |
static __always_inline int |
574197e0d tidy the trailing... |
599 |
follow_link(struct path *link, struct nameidata *nd, void **p) |
1da177e4c Linux-2.6.12-rc2 |
600 601 |
{ int error; |
7b9337aaf fs: namei fix ->p... |
602 |
struct dentry *dentry = link->dentry; |
1da177e4c Linux-2.6.12-rc2 |
603 |
|
844a39179 nothing in do_fol... |
604 |
BUG_ON(nd->flags & LOOKUP_RCU); |
0e794589e fix follow_link()... |
605 606 |
if (link->mnt == nd->path.mnt) mntget(link->mnt); |
574197e0d tidy the trailing... |
607 608 |
if (unlikely(current->total_link_count >= 40)) { *p = ERR_PTR(-ELOOP); /* no ->put_link(), please */ |
574197e0d tidy the trailing... |
609 610 611 612 613 |
path_put(&nd->path); return -ELOOP; } cond_resched(); current->total_link_count++; |
7b9337aaf fs: namei fix ->p... |
614 |
touch_atime(link->mnt, dentry); |
1da177e4c Linux-2.6.12-rc2 |
615 |
nd_set_link(nd, NULL); |
cd4e91d3b [PATCH] namei fix... |
616 |
|
36f3b4f69 pull security_ino... |
617 618 619 620 621 622 |
error = security_inode_follow_link(link->dentry, nd); if (error) { *p = ERR_PTR(error); /* no ->put_link(), please */ path_put(&nd->path); return error; } |
86acdca1b fix autofs/afs/et... |
623 |
nd->last_type = LAST_BIND; |
def4af30c Get rid of symlin... |
624 625 626 |
*p = dentry->d_inode->i_op->follow_link(dentry, nd); error = PTR_ERR(*p); if (!IS_ERR(*p)) { |
1da177e4c Linux-2.6.12-rc2 |
627 |
char *s = nd_get_link(nd); |
cc314eef0 Fix nasty ncpfs s... |
628 |
error = 0; |
1da177e4c Linux-2.6.12-rc2 |
629 630 |
if (s) error = __vfs_follow_link(nd, s); |
bcda76524 Allow O_PATH for ... |
631 |
else if (nd->last_type == LAST_BIND) { |
16c2cd717 untangle the "nee... |
632 |
nd->flags |= LOOKUP_JUMPED; |
b21041d0f update nd->inode ... |
633 634 |
nd->inode = nd->path.dentry->d_inode; if (nd->inode->i_op->follow_link) { |
bcda76524 Allow O_PATH for ... |
635 636 637 638 639 |
/* stepped on a _really_ weird one */ path_put(&nd->path); error = -ELOOP; } } |
1da177e4c Linux-2.6.12-rc2 |
640 |
} |
1da177e4c Linux-2.6.12-rc2 |
641 642 |
return error; } |
31e6b01f4 fs: rcu-walk for ... |
643 644 |
static int follow_up_rcu(struct path *path) { |
0714a5338 vfs: now it can b... |
645 646 |
struct mount *mnt = real_mount(path->mnt); struct mount *parent; |
31e6b01f4 fs: rcu-walk for ... |
647 |
struct dentry *mountpoint; |
0714a5338 vfs: now it can b... |
648 649 |
parent = mnt->mnt_parent; if (&parent->mnt == path->mnt) |
31e6b01f4 fs: rcu-walk for ... |
650 |
return 0; |
a73324da7 vfs: move mnt_mou... |
651 |
mountpoint = mnt->mnt_mountpoint; |
31e6b01f4 fs: rcu-walk for ... |
652 |
path->dentry = mountpoint; |
0714a5338 vfs: now it can b... |
653 |
path->mnt = &parent->mnt; |
31e6b01f4 fs: rcu-walk for ... |
654 655 |
return 1; } |
bab77ebf5 switch follow_up(... |
656 |
int follow_up(struct path *path) |
1da177e4c Linux-2.6.12-rc2 |
657 |
{ |
0714a5338 vfs: now it can b... |
658 659 |
struct mount *mnt = real_mount(path->mnt); struct mount *parent; |
1da177e4c Linux-2.6.12-rc2 |
660 |
struct dentry *mountpoint; |
99b7db7b8 fs: brlock vfsmou... |
661 662 |
br_read_lock(vfsmount_lock); |
0714a5338 vfs: now it can b... |
663 664 |
parent = mnt->mnt_parent; if (&parent->mnt == path->mnt) { |
99b7db7b8 fs: brlock vfsmou... |
665 |
br_read_unlock(vfsmount_lock); |
1da177e4c Linux-2.6.12-rc2 |
666 667 |
return 0; } |
0714a5338 vfs: now it can b... |
668 |
mntget(&parent->mnt); |
a73324da7 vfs: move mnt_mou... |
669 |
mountpoint = dget(mnt->mnt_mountpoint); |
99b7db7b8 fs: brlock vfsmou... |
670 |
br_read_unlock(vfsmount_lock); |
bab77ebf5 switch follow_up(... |
671 672 673 |
dput(path->dentry); path->dentry = mountpoint; mntput(path->mnt); |
0714a5338 vfs: now it can b... |
674 |
path->mnt = &parent->mnt; |
1da177e4c Linux-2.6.12-rc2 |
675 676 |
return 1; } |
b5c84bf6f fs: dcache remove... |
677 |
/* |
9875cf806 Add a dentry op t... |
678 679 680 |
* Perform an automount * - return -EISDIR to tell follow_managed() to stop and return the path we * were called with. |
1da177e4c Linux-2.6.12-rc2 |
681 |
*/ |
9875cf806 Add a dentry op t... |
682 683 |
static int follow_automount(struct path *path, unsigned flags, bool *need_mntput) |
31e6b01f4 fs: rcu-walk for ... |
684 |
{ |
9875cf806 Add a dentry op t... |
685 |
struct vfsmount *mnt; |
ea5b778a8 Unexport do_add_m... |
686 |
int err; |
9875cf806 Add a dentry op t... |
687 688 689 |
if (!path->dentry->d_op || !path->dentry->d_op->d_automount) return -EREMOTE; |
0ec26fd06 vfs: automount sh... |
690 691 692 693 694 695 696 697 698 699 |
/* We don't want to mount if someone's just doing a stat - * unless they're stat'ing a directory and appended a '/' to * the name. * * We do, however, want to mount if someone wants to open or * create a file of any type under the mountpoint, wants to * traverse through the mountpoint or wants to open the * mounted directory. Also, autofs may mark negative dentries * as being automount points. These will need the attentions * of the daemon to instantiate them before they can be used. |
9875cf806 Add a dentry op t... |
700 |
*/ |
0ec26fd06 vfs: automount sh... |
701 |
if (!(flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY | |
d94c177be vfs pathname look... |
702 |
LOOKUP_OPEN | LOOKUP_CREATE | LOOKUP_AUTOMOUNT)) && |
0ec26fd06 vfs: automount sh... |
703 704 |
path->dentry->d_inode) return -EISDIR; |
9875cf806 Add a dentry op t... |
705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 |
current->total_link_count++; if (current->total_link_count >= 40) return -ELOOP; mnt = path->dentry->d_op->d_automount(path); if (IS_ERR(mnt)) { /* * The filesystem is allowed to return -EISDIR here to indicate * it doesn't want to automount. For instance, autofs would do * this so that its userspace daemon can mount on this dentry. * * However, we can only permit this if it's a terminal point in * the path being looked up; if it wasn't then the remainder of * the path is inaccessible and we should say so. */ |
49084c3bb kill LOOKUP_CONTINUE |
720 |
if (PTR_ERR(mnt) == -EISDIR && (flags & LOOKUP_PARENT)) |
9875cf806 Add a dentry op t... |
721 722 |
return -EREMOTE; return PTR_ERR(mnt); |
31e6b01f4 fs: rcu-walk for ... |
723 |
} |
ea5b778a8 Unexport do_add_m... |
724 |
|
9875cf806 Add a dentry op t... |
725 726 |
if (!mnt) /* mount collision */ return 0; |
31e6b01f4 fs: rcu-walk for ... |
727 |
|
8aef18845 VFS: Fix vfsmount... |
728 729 730 731 732 |
if (!*need_mntput) { /* lock_mount() may release path->mnt on error */ mntget(path->mnt); *need_mntput = true; } |
19a167af7 Take the completi... |
733 |
err = finish_automount(mnt, path); |
9875cf806 Add a dentry op t... |
734 |
|
ea5b778a8 Unexport do_add_m... |
735 736 737 |
switch (err) { case -EBUSY: /* Someone else made a mount here whilst we were busy */ |
19a167af7 Take the completi... |
738 |
return 0; |
ea5b778a8 Unexport do_add_m... |
739 |
case 0: |
8aef18845 VFS: Fix vfsmount... |
740 |
path_put(path); |
ea5b778a8 Unexport do_add_m... |
741 742 |
path->mnt = mnt; path->dentry = dget(mnt->mnt_root); |
ea5b778a8 Unexport do_add_m... |
743 |
return 0; |
19a167af7 Take the completi... |
744 745 |
default: return err; |
ea5b778a8 Unexport do_add_m... |
746 |
} |
19a167af7 Take the completi... |
747 |
|
463ffb2e9 [PATCH] namei fix... |
748 |
} |
9875cf806 Add a dentry op t... |
749 750 |
/* * Handle a dentry that is managed in some way. |
cc53ce53c Add a dentry op t... |
751 |
* - Flagged for transit management (autofs) |
9875cf806 Add a dentry op t... |
752 753 754 755 756 757 758 759 |
* - Flagged as mountpoint * - Flagged as automount point * * This may only be called in refwalk mode. * * Serialization is taken care of in namespace.c */ static int follow_managed(struct path *path, unsigned flags) |
1da177e4c Linux-2.6.12-rc2 |
760 |
{ |
8aef18845 VFS: Fix vfsmount... |
761 |
struct vfsmount *mnt = path->mnt; /* held by caller, must be left alone */ |
9875cf806 Add a dentry op t... |
762 763 |
unsigned managed; bool need_mntput = false; |
8aef18845 VFS: Fix vfsmount... |
764 |
int ret = 0; |
9875cf806 Add a dentry op t... |
765 766 767 768 769 770 771 |
/* Given that we're not holding a lock here, we retain the value in a * local variable for each dentry as we look at it so that we don't see * the components of that value change under us */ while (managed = ACCESS_ONCE(path->dentry->d_flags), managed &= DCACHE_MANAGED_DENTRY, unlikely(managed != 0)) { |
cc53ce53c Add a dentry op t... |
772 773 774 775 776 |
/* Allow the filesystem to manage the transit without i_mutex * being held. */ if (managed & DCACHE_MANAGE_TRANSIT) { BUG_ON(!path->dentry->d_op); BUG_ON(!path->dentry->d_op->d_manage); |
1aed3e420 lose 'mounting_he... |
777 |
ret = path->dentry->d_op->d_manage(path->dentry, false); |
cc53ce53c Add a dentry op t... |
778 |
if (ret < 0) |
8aef18845 VFS: Fix vfsmount... |
779 |
break; |
cc53ce53c Add a dentry op t... |
780 |
} |
9875cf806 Add a dentry op t... |
781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 |
/* Transit to a mounted filesystem. */ if (managed & DCACHE_MOUNTED) { struct vfsmount *mounted = lookup_mnt(path); if (mounted) { dput(path->dentry); if (need_mntput) mntput(path->mnt); path->mnt = mounted; path->dentry = dget(mounted->mnt_root); need_mntput = true; continue; } /* Something is mounted on this dentry in another * namespace and/or whatever was mounted there in this * namespace got unmounted before we managed to get the * vfsmount_lock */ } /* Handle an automount point */ if (managed & DCACHE_NEED_AUTOMOUNT) { ret = follow_automount(path, flags, &need_mntput); if (ret < 0) |
8aef18845 VFS: Fix vfsmount... |
804 |
break; |
9875cf806 Add a dentry op t... |
805 806 807 808 809 |
continue; } /* We didn't change the current path point */ break; |
1da177e4c Linux-2.6.12-rc2 |
810 |
} |
8aef18845 VFS: Fix vfsmount... |
811 812 813 814 815 |
if (need_mntput && path->mnt == mnt) mntput(path->mnt); if (ret == -EISDIR) ret = 0; |
a3fbbde70 VFS: we need to s... |
816 |
return ret < 0 ? ret : need_mntput; |
1da177e4c Linux-2.6.12-rc2 |
817 |
} |
cc53ce53c Add a dentry op t... |
818 |
int follow_down_one(struct path *path) |
1da177e4c Linux-2.6.12-rc2 |
819 820 |
{ struct vfsmount *mounted; |
1c755af4d switch lookup_mnt() |
821 |
mounted = lookup_mnt(path); |
1da177e4c Linux-2.6.12-rc2 |
822 |
if (mounted) { |
9393bd07c switch follow_down() |
823 824 825 826 |
dput(path->dentry); mntput(path->mnt); path->mnt = mounted; path->dentry = dget(mounted->mnt_root); |
1da177e4c Linux-2.6.12-rc2 |
827 828 829 830 |
return 1; } return 0; } |
62a7375e5 vfs - check non-m... |
831 832 833 834 835 |
static inline bool managed_dentry_might_block(struct dentry *dentry) { return (dentry->d_flags & DCACHE_MANAGE_TRANSIT && dentry->d_op->d_manage(dentry, true) < 0); } |
9875cf806 Add a dentry op t... |
836 |
/* |
287548e46 split __follow_mo... |
837 838 |
* Try to skip to top of mountpoint pile in rcuwalk mode. Fail if * we meet a managed dentry that would need blocking. |
9875cf806 Add a dentry op t... |
839 840 |
*/ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path, |
287548e46 split __follow_mo... |
841 |
struct inode **inode) |
9875cf806 Add a dentry op t... |
842 |
{ |
62a7375e5 vfs - check non-m... |
843 |
for (;;) { |
c71053659 vfs: spread struc... |
844 |
struct mount *mounted; |
62a7375e5 vfs - check non-m... |
845 846 847 848 |
/* * Don't forget we might have a non-mountpoint managed dentry * that wants to block transit. */ |
287548e46 split __follow_mo... |
849 |
if (unlikely(managed_dentry_might_block(path->dentry))) |
ab90911ff Allow d_manage() ... |
850 |
return false; |
62a7375e5 vfs - check non-m... |
851 852 853 |
if (!d_mountpoint(path->dentry)) break; |
9875cf806 Add a dentry op t... |
854 855 856 |
mounted = __lookup_mnt(path->mnt, path->dentry, 1); if (!mounted) break; |
c71053659 vfs: spread struc... |
857 858 |
path->mnt = &mounted->mnt; path->dentry = mounted->mnt.mnt_root; |
a3fbbde70 VFS: we need to s... |
859 |
nd->flags |= LOOKUP_JUMPED; |
9875cf806 Add a dentry op t... |
860 |
nd->seq = read_seqcount_begin(&path->dentry->d_seq); |
594302624 vfs: fix race in ... |
861 862 863 864 865 866 |
/* * Update the inode too. We don't need to re-check the * dentry sequence number here after this d_inode read, * because a mount-point is always pinned. */ *inode = path->dentry->d_inode; |
9875cf806 Add a dentry op t... |
867 |
} |
9875cf806 Add a dentry op t... |
868 869 |
return true; } |
dea393761 Trim excessive ar... |
870 |
static void follow_mount_rcu(struct nameidata *nd) |
287548e46 split __follow_mo... |
871 |
{ |
dea393761 Trim excessive ar... |
872 |
while (d_mountpoint(nd->path.dentry)) { |
c71053659 vfs: spread struc... |
873 |
struct mount *mounted; |
dea393761 Trim excessive ar... |
874 |
mounted = __lookup_mnt(nd->path.mnt, nd->path.dentry, 1); |
287548e46 split __follow_mo... |
875 876 |
if (!mounted) break; |
c71053659 vfs: spread struc... |
877 878 |
nd->path.mnt = &mounted->mnt; nd->path.dentry = mounted->mnt.mnt_root; |
dea393761 Trim excessive ar... |
879 |
nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq); |
287548e46 split __follow_mo... |
880 881 |
} } |
31e6b01f4 fs: rcu-walk for ... |
882 883 |
static int follow_dotdot_rcu(struct nameidata *nd) { |
31e6b01f4 fs: rcu-walk for ... |
884 |
set_root_rcu(nd); |
9875cf806 Add a dentry op t... |
885 |
while (1) { |
31e6b01f4 fs: rcu-walk for ... |
886 887 888 889 890 891 892 893 894 895 896 |
if (nd->path.dentry == nd->root.dentry && nd->path.mnt == nd->root.mnt) { break; } if (nd->path.dentry != nd->path.mnt->mnt_root) { struct dentry *old = nd->path.dentry; struct dentry *parent = old->d_parent; unsigned seq; seq = read_seqcount_begin(&parent->d_seq); if (read_seqcount_retry(&old->d_seq, nd->seq)) |
ef7562d52 make handle_dots(... |
897 |
goto failed; |
31e6b01f4 fs: rcu-walk for ... |
898 899 900 901 902 903 904 |
nd->path.dentry = parent; nd->seq = seq; break; } if (!follow_up_rcu(&nd->path)) break; nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq); |
31e6b01f4 fs: rcu-walk for ... |
905 |
} |
dea393761 Trim excessive ar... |
906 907 |
follow_mount_rcu(nd); nd->inode = nd->path.dentry->d_inode; |
31e6b01f4 fs: rcu-walk for ... |
908 |
return 0; |
ef7562d52 make handle_dots(... |
909 910 911 |
failed: nd->flags &= ~LOOKUP_RCU; |
5b6ca027d reduce vfs_path_l... |
912 913 |
if (!(nd->flags & LOOKUP_ROOT)) nd->root.mnt = NULL; |
ef7562d52 make handle_dots(... |
914 915 916 |
rcu_read_unlock(); br_read_unlock(vfsmount_lock); return -ECHILD; |
31e6b01f4 fs: rcu-walk for ... |
917 |
} |
9875cf806 Add a dentry op t... |
918 |
/* |
cc53ce53c Add a dentry op t... |
919 920 921 |
* Follow down to the covering mount currently visible to userspace. At each * point, the filesystem owning that dentry may be queried as to whether the * caller is permitted to proceed or not. |
cc53ce53c Add a dentry op t... |
922 |
*/ |
7cc90cc3f don't pass 'mount... |
923 |
int follow_down(struct path *path) |
cc53ce53c Add a dentry op t... |
924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 |
{ unsigned managed; int ret; while (managed = ACCESS_ONCE(path->dentry->d_flags), unlikely(managed & DCACHE_MANAGED_DENTRY)) { /* Allow the filesystem to manage the transit without i_mutex * being held. * * We indicate to the filesystem if someone is trying to mount * something here. This gives autofs the chance to deny anyone * other than its daemon the right to mount on its * superstructure. * * The filesystem may sleep at this point. */ if (managed & DCACHE_MANAGE_TRANSIT) { BUG_ON(!path->dentry->d_op); BUG_ON(!path->dentry->d_op->d_manage); |
ab90911ff Allow d_manage() ... |
943 |
ret = path->dentry->d_op->d_manage( |
1aed3e420 lose 'mounting_he... |
944 |
path->dentry, false); |
cc53ce53c Add a dentry op t... |
945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 |
if (ret < 0) return ret == -EISDIR ? 0 : ret; } /* Transit to a mounted filesystem. */ if (managed & DCACHE_MOUNTED) { struct vfsmount *mounted = lookup_mnt(path); if (!mounted) break; dput(path->dentry); mntput(path->mnt); path->mnt = mounted; path->dentry = dget(mounted->mnt_root); continue; } /* Don't handle automount points here */ break; } return 0; } /* |
9875cf806 Add a dentry op t... |
968 969 970 971 972 973 974 975 976 977 978 979 980 981 |
* Skip to top of mountpoint pile in refwalk mode for follow_dotdot() */ static void follow_mount(struct path *path) { while (d_mountpoint(path->dentry)) { struct vfsmount *mounted = lookup_mnt(path); if (!mounted) break; dput(path->dentry); mntput(path->mnt); path->mnt = mounted; path->dentry = dget(mounted->mnt_root); } } |
31e6b01f4 fs: rcu-walk for ... |
982 |
static void follow_dotdot(struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
983 |
{ |
2a7378711 Cache root in nam... |
984 |
set_root(nd); |
e518ddb7b [PATCH] fs/namei.... |
985 |
|
1da177e4c Linux-2.6.12-rc2 |
986 |
while(1) { |
4ac913785 Embed a struct pa... |
987 |
struct dentry *old = nd->path.dentry; |
1da177e4c Linux-2.6.12-rc2 |
988 |
|
2a7378711 Cache root in nam... |
989 990 |
if (nd->path.dentry == nd->root.dentry && nd->path.mnt == nd->root.mnt) { |
1da177e4c Linux-2.6.12-rc2 |
991 992 |
break; } |
4ac913785 Embed a struct pa... |
993 |
if (nd->path.dentry != nd->path.mnt->mnt_root) { |
3088dd708 Clean follow_dotd... |
994 995 |
/* rare case of legitimate dget_parent()... */ nd->path.dentry = dget_parent(nd->path.dentry); |
1da177e4c Linux-2.6.12-rc2 |
996 997 998 |
dput(old); break; } |
3088dd708 Clean follow_dotd... |
999 |
if (!follow_up(&nd->path)) |
1da177e4c Linux-2.6.12-rc2 |
1000 |
break; |
1da177e4c Linux-2.6.12-rc2 |
1001 |
} |
79ed02261 switch follow_mou... |
1002 |
follow_mount(&nd->path); |
31e6b01f4 fs: rcu-walk for ... |
1003 |
nd->inode = nd->path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
1004 |
} |
1da177e4c Linux-2.6.12-rc2 |
1005 |
/* |
baa038907 fs: dentry alloca... |
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 |
* Allocate a dentry with name and parent, and perform a parent * directory ->lookup on it. Returns the new dentry, or ERR_PTR * on error. parent->d_inode->i_mutex must be held. d_lookup must * have verified that no child exists while under i_mutex. */ static struct dentry *d_alloc_and_lookup(struct dentry *parent, struct qstr *name, struct nameidata *nd) { struct inode *inode = parent->d_inode; struct dentry *dentry; struct dentry *old; /* Don't create child dentry for a dead directory. */ if (unlikely(IS_DEADDIR(inode))) return ERR_PTR(-ENOENT); dentry = d_alloc(parent, name); if (unlikely(!dentry)) return ERR_PTR(-ENOMEM); old = inode->i_op->lookup(inode, dentry, nd); if (unlikely(old)) { dput(dentry); dentry = old; } return dentry; } /* |
44396f4b5 fs: add a DCACHE_... |
1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 |
* We already have a dentry, but require a lookup to be performed on the parent * directory to fill in d_inode. Returns the new dentry, or ERR_PTR on error. * parent->d_inode->i_mutex must be held. d_lookup must have verified that no * child exists while under i_mutex. */ static struct dentry *d_inode_lookup(struct dentry *parent, struct dentry *dentry, struct nameidata *nd) { struct inode *inode = parent->d_inode; struct dentry *old; /* Don't create child dentry for a dead directory. */ if (unlikely(IS_DEADDIR(inode))) return ERR_PTR(-ENOENT); old = inode->i_op->lookup(inode, dentry, nd); if (unlikely(old)) { dput(dentry); dentry = old; } return dentry; } /* |
1da177e4c Linux-2.6.12-rc2 |
1059 1060 1061 1062 1063 |
* It's more convoluted than I'd like it to be, but... it's still fairly * small and for now I'd prefer to have fast path as straight as possible. * It _is_ time-critical. */ static int do_lookup(struct nameidata *nd, struct qstr *name, |
31e6b01f4 fs: rcu-walk for ... |
1064 |
struct path *path, struct inode **inode) |
1da177e4c Linux-2.6.12-rc2 |
1065 |
{ |
4ac913785 Embed a struct pa... |
1066 |
struct vfsmount *mnt = nd->path.mnt; |
31e6b01f4 fs: rcu-walk for ... |
1067 |
struct dentry *dentry, *parent = nd->path.dentry; |
5a18fff20 untangle do_lookup() |
1068 1069 |
int need_reval = 1; int status = 1; |
9875cf806 Add a dentry op t... |
1070 |
int err; |
3cac260ad Take hash recalcu... |
1071 |
/* |
b04f784e5 fs: remove extra ... |
1072 1073 1074 1075 |
* Rename seqlock is not required here because in the off chance * of a false negative due to a concurrent rename, we're going to * do the non-racy lookup, below. */ |
31e6b01f4 fs: rcu-walk for ... |
1076 1077 |
if (nd->flags & LOOKUP_RCU) { unsigned seq; |
31e6b01f4 fs: rcu-walk for ... |
1078 1079 |
*inode = nd->inode; dentry = __d_lookup_rcu(parent, name, &seq, inode); |
5a18fff20 untangle do_lookup() |
1080 1081 |
if (!dentry) goto unlazy; |
31e6b01f4 fs: rcu-walk for ... |
1082 1083 1084 |
/* Memory barrier in read_seqcount_begin of child is enough */ if (__read_seqcount_retry(&parent->d_seq, nd->seq)) return -ECHILD; |
31e6b01f4 fs: rcu-walk for ... |
1085 |
nd->seq = seq; |
5a18fff20 untangle do_lookup() |
1086 |
|
24643087e in do_lookup() sp... |
1087 |
if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE)) { |
5a18fff20 untangle do_lookup() |
1088 1089 1090 1091 1092 1093 |
status = d_revalidate(dentry, nd); if (unlikely(status <= 0)) { if (status != -ECHILD) need_reval = 0; goto unlazy; } |
24643087e in do_lookup() sp... |
1094 |
} |
44396f4b5 fs: add a DCACHE_... |
1095 1096 |
if (unlikely(d_need_lookup(dentry))) goto unlazy; |
31e6b01f4 fs: rcu-walk for ... |
1097 1098 |
path->mnt = mnt; path->dentry = dentry; |
d6e9bd256 Lift the check fo... |
1099 1100 1101 1102 1103 |
if (unlikely(!__follow_mount_rcu(nd, path, inode))) goto unlazy; if (unlikely(path->dentry->d_flags & DCACHE_NEED_AUTOMOUNT)) goto unlazy; return 0; |
5a18fff20 untangle do_lookup() |
1104 |
unlazy: |
19660af73 consolidate namei... |
1105 1106 |
if (unlazy_walk(nd, dentry)) return -ECHILD; |
5a18fff20 untangle do_lookup() |
1107 1108 |
} else { dentry = __d_lookup(parent, name); |
9875cf806 Add a dentry op t... |
1109 |
} |
5a18fff20 untangle do_lookup() |
1110 |
|
44396f4b5 fs: add a DCACHE_... |
1111 1112 1113 1114 |
if (dentry && unlikely(d_need_lookup(dentry))) { dput(dentry); dentry = NULL; } |
5a18fff20 untangle do_lookup() |
1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 |
retry: if (unlikely(!dentry)) { struct inode *dir = parent->d_inode; BUG_ON(nd->inode != dir); mutex_lock(&dir->i_mutex); dentry = d_lookup(parent, name); if (likely(!dentry)) { dentry = d_alloc_and_lookup(parent, name, nd); if (IS_ERR(dentry)) { mutex_unlock(&dir->i_mutex); return PTR_ERR(dentry); } /* known good */ need_reval = 0; status = 1; |
44396f4b5 fs: add a DCACHE_... |
1131 1132 1133 1134 1135 1136 1137 1138 1139 |
} else if (unlikely(d_need_lookup(dentry))) { dentry = d_inode_lookup(parent, dentry, nd); if (IS_ERR(dentry)) { mutex_unlock(&dir->i_mutex); return PTR_ERR(dentry); } /* known good */ need_reval = 0; status = 1; |
5a18fff20 untangle do_lookup() |
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 |
} mutex_unlock(&dir->i_mutex); } if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE) && need_reval) status = d_revalidate(dentry, nd); if (unlikely(status <= 0)) { if (status < 0) { dput(dentry); return status; } if (!d_invalidate(dentry)) { dput(dentry); dentry = NULL; need_reval = 1; goto retry; } |
24643087e in do_lookup() sp... |
1156 |
} |
5a18fff20 untangle do_lookup() |
1157 |
|
9875cf806 Add a dentry op t... |
1158 1159 1160 |
path->mnt = mnt; path->dentry = dentry; err = follow_managed(path, nd->flags); |
893122141 vfs - fix dentry ... |
1161 1162 |
if (unlikely(err < 0)) { path_put_conditional(path, nd); |
9875cf806 Add a dentry op t... |
1163 |
return err; |
893122141 vfs - fix dentry ... |
1164 |
} |
a3fbbde70 VFS: we need to s... |
1165 1166 |
if (err) nd->flags |= LOOKUP_JUMPED; |
9875cf806 Add a dentry op t... |
1167 |
*inode = path->dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
1168 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1169 |
} |
52094c8a0 take RCU-dependen... |
1170 1171 1172 |
static inline int may_lookup(struct nameidata *nd) { if (nd->flags & LOOKUP_RCU) { |
4ad5abb3d no reason to keep... |
1173 |
int err = inode_permission(nd->inode, MAY_EXEC|MAY_NOT_BLOCK); |
52094c8a0 take RCU-dependen... |
1174 1175 |
if (err != -ECHILD) return err; |
19660af73 consolidate namei... |
1176 |
if (unlazy_walk(nd, NULL)) |
52094c8a0 take RCU-dependen... |
1177 1178 |
return -ECHILD; } |
4ad5abb3d no reason to keep... |
1179 |
return inode_permission(nd->inode, MAY_EXEC); |
52094c8a0 take RCU-dependen... |
1180 |
} |
9856fa1b2 pull handling of ... |
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 |
static inline int handle_dots(struct nameidata *nd, int type) { if (type == LAST_DOTDOT) { if (nd->flags & LOOKUP_RCU) { if (follow_dotdot_rcu(nd)) return -ECHILD; } else follow_dotdot(nd); } return 0; } |
951361f95 get rid of the la... |
1192 1193 1194 1195 1196 1197 |
static void terminate_walk(struct nameidata *nd) { if (!(nd->flags & LOOKUP_RCU)) { path_put(&nd->path); } else { nd->flags &= ~LOOKUP_RCU; |
5b6ca027d reduce vfs_path_l... |
1198 1199 |
if (!(nd->flags & LOOKUP_ROOT)) nd->root.mnt = NULL; |
951361f95 get rid of the la... |
1200 1201 1202 1203 |
rcu_read_unlock(); br_read_unlock(vfsmount_lock); } } |
3ddcd0569 vfs: optimize ino... |
1204 1205 1206 1207 1208 1209 |
/* * Do we need to follow links? We _really_ want to be able * to do this check without having to look at inode->i_op, * so we keep a cache of "no, this doesn't need follow_link" * for the common case. */ |
7813b94a5 vfs: rename 'do_f... |
1210 |
static inline int should_follow_link(struct inode *inode, int follow) |
3ddcd0569 vfs: optimize ino... |
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 |
{ if (unlikely(!(inode->i_opflags & IOP_NOFOLLOW))) { if (likely(inode->i_op->follow_link)) return follow; /* This gets set once for the inode lifetime */ spin_lock(&inode->i_lock); inode->i_opflags |= IOP_NOFOLLOW; spin_unlock(&inode->i_lock); } return 0; } |
ce57dfc17 pull handling of ... |
1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 |
static inline int walk_component(struct nameidata *nd, struct path *path, struct qstr *name, int type, int follow) { struct inode *inode; int err; /* * "." and ".." are special - ".." especially so because it has * to be able to know about the current root directory and * parent relationships. */ if (unlikely(type != LAST_NORM)) return handle_dots(nd, type); err = do_lookup(nd, name, path, &inode); if (unlikely(err)) { terminate_walk(nd); return err; } if (!inode) { path_to_nameidata(path, nd); terminate_walk(nd); return -ENOENT; } |
7813b94a5 vfs: rename 'do_f... |
1245 |
if (should_follow_link(inode, follow)) { |
19660af73 consolidate namei... |
1246 1247 1248 1249 1250 1251 |
if (nd->flags & LOOKUP_RCU) { if (unlikely(unlazy_walk(nd, path->dentry))) { terminate_walk(nd); return -ECHILD; } } |
ce57dfc17 pull handling of ... |
1252 1253 1254 1255 1256 1257 1258 |
BUG_ON(inode != path->dentry->d_inode); return 1; } path_to_nameidata(path, nd); nd->inode = inode; return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1259 |
/* |
b356379a0 Turn resolution o... |
1260 1261 1262 1263 1264 1265 1266 1267 1268 |
* This limits recursive symlink follows to 8, while * limiting consecutive symlinks to 40. * * Without that kind of total limit, nasty chains of consecutive * symlinks can cause almost arbitrarily long lookups. */ static inline int nested_symlink(struct path *path, struct nameidata *nd) { int res; |
b356379a0 Turn resolution o... |
1269 1270 1271 1272 1273 |
if (unlikely(current->link_count >= MAX_NESTED_LINKS)) { path_put_conditional(path, nd); path_put(&nd->path); return -ELOOP; } |
1a4022f88 VFS: move BUG_ON ... |
1274 |
BUG_ON(nd->depth >= MAX_NESTED_LINKS); |
b356379a0 Turn resolution o... |
1275 1276 1277 1278 1279 1280 1281 |
nd->depth++; current->link_count++; do { struct path link = *path; void *cookie; |
574197e0d tidy the trailing... |
1282 1283 |
res = follow_link(&link, nd, &cookie); |
b356379a0 Turn resolution o... |
1284 1285 1286 |
if (!res) res = walk_component(nd, path, &nd->last, nd->last_type, LOOKUP_FOLLOW); |
574197e0d tidy the trailing... |
1287 |
put_link(nd, &link, cookie); |
b356379a0 Turn resolution o... |
1288 1289 1290 1291 1292 1293 1294 1295 |
} while (res > 0); current->link_count--; nd->depth--; return res; } /* |
3ddcd0569 vfs: optimize ino... |
1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 |
* We really don't want to look at inode->i_op->lookup * when we don't have to. So we keep a cache bit in * the inode ->i_opflags field that says "yes, we can * do lookup on this inode". */ static inline int can_lookup(struct inode *inode) { if (likely(inode->i_opflags & IOP_LOOKUP)) return 1; if (likely(!inode->i_op->lookup)) return 0; /* We do this once for the lifetime of the inode */ spin_lock(&inode->i_lock); inode->i_opflags |= IOP_LOOKUP; spin_unlock(&inode->i_lock); return 1; } /* |
1da177e4c Linux-2.6.12-rc2 |
1316 |
* Name resolution. |
ea3834d9f namei: add audit_... |
1317 1318 |
* This is the basic name resolution function, turning a pathname into * the final dentry. We expect 'base' to be positive and a directory. |
1da177e4c Linux-2.6.12-rc2 |
1319 |
* |
ea3834d9f namei: add audit_... |
1320 1321 |
* Returns 0 and nd will have valid dentry and mnt on success. * Returns error and drops reference to input namei data on failure. |
1da177e4c Linux-2.6.12-rc2 |
1322 |
*/ |
6de88d729 kill __link_path_... |
1323 |
static int link_path_walk(const char *name, struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
1324 1325 |
{ struct path next; |
1da177e4c Linux-2.6.12-rc2 |
1326 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
1327 1328 1329 1330 |
while (*name=='/') name++; if (!*name) |
086e183a6 pull dropping RCU... |
1331 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1332 |
|
1da177e4c Linux-2.6.12-rc2 |
1333 1334 1335 1336 1337 |
/* At this point we know we have a real path component. */ for(;;) { unsigned long hash; struct qstr this; unsigned int c; |
fe479a580 merge component t... |
1338 |
int type; |
1da177e4c Linux-2.6.12-rc2 |
1339 |
|
52094c8a0 take RCU-dependen... |
1340 |
err = may_lookup(nd); |
1da177e4c Linux-2.6.12-rc2 |
1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 |
if (err) break; this.name = name; c = *(const unsigned char *)name; hash = init_name_hash(); do { name++; hash = partial_name_hash(c, hash); c = *(const unsigned char *)name; } while (c && (c != '/')); this.len = name - (const char *) this.name; this.hash = end_name_hash(hash); |
fe479a580 merge component t... |
1355 1356 1357 |
type = LAST_NORM; if (this.name[0] == '.') switch (this.len) { case 2: |
16c2cd717 untangle the "nee... |
1358 |
if (this.name[1] == '.') { |
fe479a580 merge component t... |
1359 |
type = LAST_DOTDOT; |
16c2cd717 untangle the "nee... |
1360 1361 |
nd->flags |= LOOKUP_JUMPED; } |
fe479a580 merge component t... |
1362 1363 1364 1365 |
break; case 1: type = LAST_DOT; } |
5a202bcd7 sanitize pathname... |
1366 1367 |
if (likely(type == LAST_NORM)) { struct dentry *parent = nd->path.dentry; |
16c2cd717 untangle the "nee... |
1368 |
nd->flags &= ~LOOKUP_JUMPED; |
5a202bcd7 sanitize pathname... |
1369 1370 1371 1372 1373 1374 1375 |
if (unlikely(parent->d_flags & DCACHE_OP_HASH)) { err = parent->d_op->d_hash(parent, nd->inode, &this); if (err < 0) break; } } |
fe479a580 merge component t... |
1376 |
|
1da177e4c Linux-2.6.12-rc2 |
1377 1378 1379 1380 1381 |
/* remove trailing slashes? */ if (!c) goto last_component; while (*++name == '/'); if (!*name) |
b356379a0 Turn resolution o... |
1382 |
goto last_component; |
1da177e4c Linux-2.6.12-rc2 |
1383 |
|
ce57dfc17 pull handling of ... |
1384 1385 1386 |
err = walk_component(nd, &next, &this, type, LOOKUP_FOLLOW); if (err < 0) return err; |
1da177e4c Linux-2.6.12-rc2 |
1387 |
|
ce57dfc17 pull handling of ... |
1388 |
if (err) { |
b356379a0 Turn resolution o... |
1389 |
err = nested_symlink(&next, nd); |
1da177e4c Linux-2.6.12-rc2 |
1390 |
if (err) |
a7472baba make nameidata_de... |
1391 |
return err; |
31e6b01f4 fs: rcu-walk for ... |
1392 |
} |
3ddcd0569 vfs: optimize ino... |
1393 1394 |
if (can_lookup(nd->inode)) continue; |
1da177e4c Linux-2.6.12-rc2 |
1395 |
err = -ENOTDIR; |
3ddcd0569 vfs: optimize ino... |
1396 |
break; |
1da177e4c Linux-2.6.12-rc2 |
1397 |
/* here ends the main loop */ |
1da177e4c Linux-2.6.12-rc2 |
1398 |
last_component: |
b356379a0 Turn resolution o... |
1399 1400 |
nd->last = this; nd->last_type = type; |
086e183a6 pull dropping RCU... |
1401 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1402 |
} |
951361f95 get rid of the la... |
1403 |
terminate_walk(nd); |
1da177e4c Linux-2.6.12-rc2 |
1404 1405 |
return err; } |
70e9b3571 get rid of nd->file |
1406 1407 |
static int path_init(int dfd, const char *name, unsigned int flags, struct nameidata *nd, struct file **fp) |
31e6b01f4 fs: rcu-walk for ... |
1408 1409 1410 1411 1412 1413 |
{ int retval = 0; int fput_needed; struct file *file; nd->last_type = LAST_ROOT; /* if there are only slashes... */ |
16c2cd717 untangle the "nee... |
1414 |
nd->flags = flags | LOOKUP_JUMPED; |
31e6b01f4 fs: rcu-walk for ... |
1415 |
nd->depth = 0; |
5b6ca027d reduce vfs_path_l... |
1416 1417 |
if (flags & LOOKUP_ROOT) { struct inode *inode = nd->root.dentry->d_inode; |
73d049a40 open-style analog... |
1418 1419 1420 1421 1422 1423 1424 |
if (*name) { if (!inode->i_op->lookup) return -ENOTDIR; retval = inode_permission(inode, MAY_EXEC); if (retval) return retval; } |
5b6ca027d reduce vfs_path_l... |
1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 |
nd->path = nd->root; nd->inode = inode; if (flags & LOOKUP_RCU) { br_read_lock(vfsmount_lock); rcu_read_lock(); nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq); } else { path_get(&nd->path); } return 0; } |
31e6b01f4 fs: rcu-walk for ... |
1436 |
nd->root.mnt = NULL; |
31e6b01f4 fs: rcu-walk for ... |
1437 1438 |
if (*name=='/') { |
e41f7d4ee merge path_init a... |
1439 1440 1441 1442 1443 1444 1445 1446 1447 |
if (flags & LOOKUP_RCU) { br_read_lock(vfsmount_lock); rcu_read_lock(); set_root_rcu(nd); } else { set_root(nd); path_get(&nd->root); } nd->path = nd->root; |
31e6b01f4 fs: rcu-walk for ... |
1448 |
} else if (dfd == AT_FDCWD) { |
e41f7d4ee merge path_init a... |
1449 1450 1451 |
if (flags & LOOKUP_RCU) { struct fs_struct *fs = current->fs; unsigned seq; |
31e6b01f4 fs: rcu-walk for ... |
1452 |
|
e41f7d4ee merge path_init a... |
1453 1454 |
br_read_lock(vfsmount_lock); rcu_read_lock(); |
c28cc3646 fs: fs_struct use... |
1455 |
|
e41f7d4ee merge path_init a... |
1456 1457 1458 1459 1460 1461 1462 1463 |
do { seq = read_seqcount_begin(&fs->seq); nd->path = fs->pwd; nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq); } while (read_seqcount_retry(&fs->seq, seq)); } else { get_fs_pwd(current->fs, &nd->path); } |
31e6b01f4 fs: rcu-walk for ... |
1464 1465 |
} else { struct dentry *dentry; |
1abf0c718 New kind of open ... |
1466 |
file = fget_raw_light(dfd, &fput_needed); |
31e6b01f4 fs: rcu-walk for ... |
1467 1468 1469 1470 1471 |
retval = -EBADF; if (!file) goto out_fail; dentry = file->f_path.dentry; |
f52e0c113 New AT_... flag: ... |
1472 1473 1474 1475 |
if (*name) { retval = -ENOTDIR; if (!S_ISDIR(dentry->d_inode->i_mode)) goto fput_fail; |
31e6b01f4 fs: rcu-walk for ... |
1476 |
|
4ad5abb3d no reason to keep... |
1477 |
retval = inode_permission(dentry->d_inode, MAY_EXEC); |
f52e0c113 New AT_... flag: ... |
1478 1479 1480 |
if (retval) goto fput_fail; } |
31e6b01f4 fs: rcu-walk for ... |
1481 1482 |
nd->path = file->f_path; |
e41f7d4ee merge path_init a... |
1483 1484 |
if (flags & LOOKUP_RCU) { if (fput_needed) |
70e9b3571 get rid of nd->file |
1485 |
*fp = file; |
e41f7d4ee merge path_init a... |
1486 1487 1488 1489 1490 1491 1492 |
nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq); br_read_lock(vfsmount_lock); rcu_read_lock(); } else { path_get(&file->f_path); fput_light(file, fput_needed); } |
31e6b01f4 fs: rcu-walk for ... |
1493 |
} |
31e6b01f4 fs: rcu-walk for ... |
1494 |
|
31e6b01f4 fs: rcu-walk for ... |
1495 |
nd->inode = nd->path.dentry->d_inode; |
9b4a9b14a Preparations to c... |
1496 |
return 0; |
2dfdd266b fs: use path_walk... |
1497 |
|
9b4a9b14a Preparations to c... |
1498 1499 1500 1501 1502 |
fput_fail: fput_light(file, fput_needed); out_fail: return retval; } |
bd92d7fed Make trailing sym... |
1503 1504 1505 1506 1507 1508 1509 1510 1511 |
static inline int lookup_last(struct nameidata *nd, struct path *path) { if (nd->last_type == LAST_NORM && nd->last.name[nd->last.len]) nd->flags |= LOOKUP_FOLLOW | LOOKUP_DIRECTORY; nd->flags &= ~LOOKUP_PARENT; return walk_component(nd, path, &nd->last, nd->last_type, nd->flags & LOOKUP_FOLLOW); } |
9b4a9b14a Preparations to c... |
1512 |
/* Returns 0 and nd will be valid on success; Retuns error, otherwise. */ |
ee0827cd6 sanitize path_wal... |
1513 |
static int path_lookupat(int dfd, const char *name, |
9b4a9b14a Preparations to c... |
1514 1515 |
unsigned int flags, struct nameidata *nd) { |
70e9b3571 get rid of nd->file |
1516 |
struct file *base = NULL; |
bd92d7fed Make trailing sym... |
1517 1518 |
struct path path; int err; |
31e6b01f4 fs: rcu-walk for ... |
1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 |
/* * Path walking is largely split up into 2 different synchronisation * schemes, rcu-walk and ref-walk (explained in * Documentation/filesystems/path-lookup.txt). These share much of the * path walk code, but some things particularly setup, cleanup, and * following mounts are sufficiently divergent that functions are * duplicated. Typically there is a function foo(), and its RCU * analogue, foo_rcu(). * * -ECHILD is the error number of choice (just to avoid clashes) that * is returned if some aspect of an rcu-walk fails. Such an error must * be handled by restarting a traditional ref-walk (which will always * be able to complete). */ |
bd92d7fed Make trailing sym... |
1534 |
err = path_init(dfd, name, flags | LOOKUP_PARENT, nd, &base); |
ee0827cd6 sanitize path_wal... |
1535 |
|
bd92d7fed Make trailing sym... |
1536 1537 |
if (unlikely(err)) return err; |
ee0827cd6 sanitize path_wal... |
1538 1539 |
current->total_link_count = 0; |
bd92d7fed Make trailing sym... |
1540 1541 1542 |
err = link_path_walk(name, nd); if (!err && !(flags & LOOKUP_PARENT)) { |
bd92d7fed Make trailing sym... |
1543 1544 1545 1546 |
err = lookup_last(nd, &path); while (err > 0) { void *cookie; struct path link = path; |
bd92d7fed Make trailing sym... |
1547 |
nd->flags |= LOOKUP_PARENT; |
574197e0d tidy the trailing... |
1548 |
err = follow_link(&link, nd, &cookie); |
bd92d7fed Make trailing sym... |
1549 1550 |
if (!err) err = lookup_last(nd, &path); |
574197e0d tidy the trailing... |
1551 |
put_link(nd, &link, cookie); |
bd92d7fed Make trailing sym... |
1552 1553 |
} } |
ee0827cd6 sanitize path_wal... |
1554 |
|
9f1fafee9 merge handle_reva... |
1555 1556 |
if (!err) err = complete_walk(nd); |
bd92d7fed Make trailing sym... |
1557 1558 1559 1560 |
if (!err && nd->flags & LOOKUP_DIRECTORY) { if (!nd->inode->i_op->lookup) { path_put(&nd->path); |
bd23a539d fix leaks in path... |
1561 |
err = -ENOTDIR; |
bd92d7fed Make trailing sym... |
1562 1563 |
} } |
16c2cd717 untangle the "nee... |
1564 |
|
70e9b3571 get rid of nd->file |
1565 1566 |
if (base) fput(base); |
ee0827cd6 sanitize path_wal... |
1567 |
|
5b6ca027d reduce vfs_path_l... |
1568 |
if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) { |
2a7378711 Cache root in nam... |
1569 1570 1571 |
path_put(&nd->root); nd->root.mnt = NULL; } |
bd92d7fed Make trailing sym... |
1572 |
return err; |
ee0827cd6 sanitize path_wal... |
1573 |
} |
31e6b01f4 fs: rcu-walk for ... |
1574 |
|
ee0827cd6 sanitize path_wal... |
1575 1576 1577 1578 1579 1580 1581 1582 |
static int do_path_lookup(int dfd, const char *name, unsigned int flags, struct nameidata *nd) { int retval = path_lookupat(dfd, name, flags | LOOKUP_RCU, nd); if (unlikely(retval == -ECHILD)) retval = path_lookupat(dfd, name, flags, nd); if (unlikely(retval == -ESTALE)) retval = path_lookupat(dfd, name, flags | LOOKUP_REVAL, nd); |
31e6b01f4 fs: rcu-walk for ... |
1583 1584 1585 1586 1587 1588 1589 |
if (likely(!retval)) { if (unlikely(!audit_dummy_context())) { if (nd->path.dentry && nd->inode) audit_inode(name, nd->path.dentry); } } |
170aa3d02 [PATCH] namei.c: ... |
1590 |
return retval; |
1da177e4c Linux-2.6.12-rc2 |
1591 |
} |
c9c6cac0c kill path_lookup() |
1592 |
int kern_path_parent(const char *name, struct nameidata *nd) |
5590ff0d5 [PATCH] vfs: *at ... |
1593 |
{ |
c9c6cac0c kill path_lookup() |
1594 |
return do_path_lookup(AT_FDCWD, name, LOOKUP_PARENT, nd); |
5590ff0d5 [PATCH] vfs: *at ... |
1595 |
} |
d18114657 [PATCH] new helpe... |
1596 1597 1598 1599 1600 1601 1602 1603 |
int kern_path(const char *name, unsigned int flags, struct path *path) { struct nameidata nd; int res = do_path_lookup(AT_FDCWD, name, flags, &nd); if (!res) *path = nd.path; return res; } |
16f182002 fs: introduce vfs... |
1604 1605 1606 1607 1608 1609 |
/** * vfs_path_lookup - lookup a file path relative to a dentry-vfsmount pair * @dentry: pointer to dentry of the base directory * @mnt: pointer to vfs mount of the base directory * @name: pointer to file name * @flags: lookup flags |
e0a012493 switch vfs_path_l... |
1610 |
* @path: pointer to struct path to fill |
16f182002 fs: introduce vfs... |
1611 1612 1613 |
*/ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt, const char *name, unsigned int flags, |
e0a012493 switch vfs_path_l... |
1614 |
struct path *path) |
16f182002 fs: introduce vfs... |
1615 |
{ |
e0a012493 switch vfs_path_l... |
1616 1617 1618 1619 1620 |
struct nameidata nd; int err; nd.root.dentry = dentry; nd.root.mnt = mnt; BUG_ON(flags & LOOKUP_PARENT); |
5b6ca027d reduce vfs_path_l... |
1621 |
/* the first argument of do_path_lookup() is ignored with LOOKUP_ROOT */ |
e0a012493 switch vfs_path_l... |
1622 1623 1624 1625 |
err = do_path_lookup(AT_FDCWD, name, flags | LOOKUP_ROOT, &nd); if (!err) *path = nd.path; return err; |
16f182002 fs: introduce vfs... |
1626 |
} |
eead19115 partially fix up ... |
1627 1628 |
static struct dentry *__lookup_hash(struct qstr *name, struct dentry *base, struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
1629 |
{ |
81fca4440 fs: move permissi... |
1630 |
struct inode *inode = base->d_inode; |
057f6c019 security: prevent... |
1631 |
struct dentry *dentry; |
1da177e4c Linux-2.6.12-rc2 |
1632 |
int err; |
4ad5abb3d no reason to keep... |
1633 |
err = inode_permission(inode, MAY_EXEC); |
81fca4440 fs: move permissi... |
1634 1635 |
if (err) return ERR_PTR(err); |
1da177e4c Linux-2.6.12-rc2 |
1636 1637 |
/* |
b04f784e5 fs: remove extra ... |
1638 1639 1640 |
* Don't bother with __d_lookup: callers are for creat as * well as unlink, so a lot of the time it would cost * a double lookup. |
6e6b1bd1e Kill cached_looku... |
1641 |
*/ |
b04f784e5 fs: remove extra ... |
1642 |
dentry = d_lookup(base, name); |
6e6b1bd1e Kill cached_looku... |
1643 |
|
44396f4b5 fs: add a DCACHE_... |
1644 1645 1646 1647 1648 1649 1650 1651 1652 |
if (dentry && d_need_lookup(dentry)) { /* * __lookup_hash is called with the parent dir's i_mutex already * held, so we are good to go here. */ dentry = d_inode_lookup(base, dentry, nd); if (IS_ERR(dentry)) return dentry; } |
d2d9e9fbc merge do_revalida... |
1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 |
if (dentry && (dentry->d_flags & DCACHE_OP_REVALIDATE)) { int status = d_revalidate(dentry, nd); if (unlikely(status <= 0)) { /* * The dentry failed validation. * If d_revalidate returned 0 attempt to invalidate * the dentry otherwise d_revalidate is asking us * to return a fail status. */ if (status < 0) { dput(dentry); return ERR_PTR(status); } else if (!d_invalidate(dentry)) { dput(dentry); dentry = NULL; } } } |
6e6b1bd1e Kill cached_looku... |
1671 |
|
baa038907 fs: dentry alloca... |
1672 1673 |
if (!dentry) dentry = d_alloc_and_lookup(base, name, nd); |
5a202bcd7 sanitize pathname... |
1674 |
|
1da177e4c Linux-2.6.12-rc2 |
1675 1676 |
return dentry; } |
057f6c019 security: prevent... |
1677 1678 1679 1680 1681 |
/* * Restricted form of lookup. Doesn't follow links, single-component only, * needs parent already locked. Doesn't follow mounts. * SMP-safe. */ |
eead19115 partially fix up ... |
1682 |
static struct dentry *lookup_hash(struct nameidata *nd) |
057f6c019 security: prevent... |
1683 |
{ |
4ac913785 Embed a struct pa... |
1684 |
return __lookup_hash(&nd->last, nd->path.dentry, nd); |
1da177e4c Linux-2.6.12-rc2 |
1685 |
} |
eead19115 partially fix up ... |
1686 |
/** |
a6b91919e fs: fix kernel-do... |
1687 |
* lookup_one_len - filesystem helper to lookup single pathname component |
eead19115 partially fix up ... |
1688 1689 1690 1691 |
* @name: pathname component to lookup * @base: base directory to lookup from * @len: maximum length @len should be interpreted to * |
a6b91919e fs: fix kernel-do... |
1692 1693 |
* Note that this routine is purely a helper for filesystem usage and should * not be called by generic code. Also note that by using this function the |
eead19115 partially fix up ... |
1694 1695 1696 |
* nameidata argument is passed to the filesystem methods and a filesystem * using this helper needs to be prepared for that. */ |
057f6c019 security: prevent... |
1697 1698 |
struct dentry *lookup_one_len(const char *name, struct dentry *base, int len) { |
057f6c019 security: prevent... |
1699 |
struct qstr this; |
6a96ba544 kill __lookup_one... |
1700 1701 |
unsigned long hash; unsigned int c; |
057f6c019 security: prevent... |
1702 |
|
2f9092e10 Fix i_mutex vs. r... |
1703 |
WARN_ON_ONCE(!mutex_is_locked(&base->d_inode->i_mutex)); |
6a96ba544 kill __lookup_one... |
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 |
this.name = name; this.len = len; if (!len) return ERR_PTR(-EACCES); hash = init_name_hash(); while (len--) { c = *(const unsigned char *)name++; if (c == '/' || c == '\0') return ERR_PTR(-EACCES); hash = partial_name_hash(c, hash); } this.hash = end_name_hash(hash); |
5a202bcd7 sanitize pathname... |
1717 1718 1719 1720 1721 1722 1723 1724 1725 |
/* * See if the low-level filesystem might want * to use its own hash.. */ if (base->d_flags & DCACHE_OP_HASH) { int err = base->d_op->d_hash(base, base->d_inode, &this); if (err < 0) return ERR_PTR(err); } |
eead19115 partially fix up ... |
1726 |
|
49705b774 [PATCH] sanitize ... |
1727 |
return __lookup_hash(&this, base, NULL); |
057f6c019 security: prevent... |
1728 |
} |
1fa1e7f61 readlinkat: ensur... |
1729 1730 |
int user_path_at_empty(int dfd, const char __user *name, unsigned flags, struct path *path, int *empty) |
1da177e4c Linux-2.6.12-rc2 |
1731 |
{ |
2d8f30380 [PATCH] sanitize ... |
1732 |
struct nameidata nd; |
1fa1e7f61 readlinkat: ensur... |
1733 |
char *tmp = getname_flags(name, flags, empty); |
1da177e4c Linux-2.6.12-rc2 |
1734 |
int err = PTR_ERR(tmp); |
1da177e4c Linux-2.6.12-rc2 |
1735 |
if (!IS_ERR(tmp)) { |
2d8f30380 [PATCH] sanitize ... |
1736 1737 1738 1739 |
BUG_ON(flags & LOOKUP_PARENT); err = do_path_lookup(dfd, tmp, flags, &nd); |
1da177e4c Linux-2.6.12-rc2 |
1740 |
putname(tmp); |
2d8f30380 [PATCH] sanitize ... |
1741 1742 |
if (!err) *path = nd.path; |
1da177e4c Linux-2.6.12-rc2 |
1743 1744 1745 |
} return err; } |
1fa1e7f61 readlinkat: ensur... |
1746 1747 1748 1749 1750 |
int user_path_at(int dfd, const char __user *name, unsigned flags, struct path *path) { return user_path_at_empty(dfd, name, flags, path, 0); } |
2ad94ae65 [PATCH] new (loca... |
1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 |
static int user_path_parent(int dfd, const char __user *path, struct nameidata *nd, char **name) { char *s = getname(path); int error; if (IS_ERR(s)) return PTR_ERR(s); error = do_path_lookup(dfd, s, LOOKUP_PARENT, nd); if (error) putname(s); else *name = s; return error; } |
1da177e4c Linux-2.6.12-rc2 |
1768 1769 1770 1771 1772 1773 |
/* * It's inline, so penalty for filesystems that don't use sticky bit is * minimal. */ static inline int check_sticky(struct inode *dir, struct inode *inode) { |
da9592ede CRED: Wrap task c... |
1774 |
uid_t fsuid = current_fsuid(); |
1da177e4c Linux-2.6.12-rc2 |
1775 1776 |
if (!(dir->i_mode & S_ISVTX)) return 0; |
e795b7179 userns: userns: c... |
1777 1778 |
if (current_user_ns() != inode_userns(inode)) goto other_userns; |
da9592ede CRED: Wrap task c... |
1779 |
if (inode->i_uid == fsuid) |
1da177e4c Linux-2.6.12-rc2 |
1780 |
return 0; |
da9592ede CRED: Wrap task c... |
1781 |
if (dir->i_uid == fsuid) |
1da177e4c Linux-2.6.12-rc2 |
1782 |
return 0; |
e795b7179 userns: userns: c... |
1783 1784 1785 |
other_userns: return !ns_capable(inode_userns(inode), CAP_FOWNER); |
1da177e4c Linux-2.6.12-rc2 |
1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 |
} /* * Check whether we can remove a link victim from directory dir, check * whether the type of victim is right. * 1. We can't do it if dir is read-only (done in permission()) * 2. We should have write and exec permissions on dir * 3. We can't remove anything from append-only dir * 4. We can't do anything with immutable dir (done in permission()) * 5. If the sticky bit on dir is set we should either * a. be owner of dir, or * b. be owner of victim, or * c. have CAP_FOWNER capability * 6. If the victim is append-only or immutable we can't do antyhing with * links pointing to it. * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. * 9. We can't remove a root or mountpoint. * 10. We don't allow removal of NFS sillyrenamed files; it's handled by * nfs_async_unlink(). */ |
858119e15 [PATCH] Unlinline... |
1807 |
static int may_delete(struct inode *dir,struct dentry *victim,int isdir) |
1da177e4c Linux-2.6.12-rc2 |
1808 1809 1810 1811 1812 1813 1814 |
{ int error; if (!victim->d_inode) return -ENOENT; BUG_ON(victim->d_parent->d_inode != dir); |
cccc6bba3 Lose the first ar... |
1815 |
audit_inode_child(victim, dir); |
1da177e4c Linux-2.6.12-rc2 |
1816 |
|
f419a2e3b [PATCH] kill name... |
1817 |
error = inode_permission(dir, MAY_WRITE | MAY_EXEC); |
1da177e4c Linux-2.6.12-rc2 |
1818 1819 1820 1821 1822 |
if (error) return error; if (IS_APPEND(dir)) return -EPERM; if (check_sticky(dir, victim->d_inode)||IS_APPEND(victim->d_inode)|| |
f9454548e don't unlink an a... |
1823 |
IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) |
1da177e4c Linux-2.6.12-rc2 |
1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 |
return -EPERM; if (isdir) { if (!S_ISDIR(victim->d_inode->i_mode)) return -ENOTDIR; if (IS_ROOT(victim)) return -EBUSY; } else if (S_ISDIR(victim->d_inode->i_mode)) return -EISDIR; if (IS_DEADDIR(dir)) return -ENOENT; if (victim->d_flags & DCACHE_NFSFS_RENAMED) return -EBUSY; return 0; } /* Check whether we can create an object with dentry child in directory * dir. * 1. We can't do it if child already exists (open has special treatment for * this case, but since we are inlined it's OK) * 2. We can't do it if dir is read-only (done in permission()) * 3. We should have write and exec permissions on dir * 4. We can't do it if dir is immutable (done in permission()) */ |
a95164d97 [patch 3/4] vfs: ... |
1847 |
static inline int may_create(struct inode *dir, struct dentry *child) |
1da177e4c Linux-2.6.12-rc2 |
1848 1849 1850 1851 1852 |
{ if (child->d_inode) return -EEXIST; if (IS_DEADDIR(dir)) return -ENOENT; |
f419a2e3b [PATCH] kill name... |
1853 |
return inode_permission(dir, MAY_WRITE | MAY_EXEC); |
1da177e4c Linux-2.6.12-rc2 |
1854 |
} |
1da177e4c Linux-2.6.12-rc2 |
1855 1856 1857 1858 1859 1860 1861 1862 |
/* * p1 and p2 should be directories on the same fs. */ struct dentry *lock_rename(struct dentry *p1, struct dentry *p2) { struct dentry *p; if (p1 == p2) { |
f2eace23e [PATCH] lockdep: ... |
1863 |
mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_PARENT); |
1da177e4c Linux-2.6.12-rc2 |
1864 1865 |
return NULL; } |
a11f3a057 [PATCH] sem2mutex... |
1866 |
mutex_lock(&p1->d_inode->i_sb->s_vfs_rename_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1867 |
|
e2761a116 [PATCH vfs-2.6 2/... |
1868 1869 1870 1871 1872 |
p = d_ancestor(p2, p1); if (p) { mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_PARENT); mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_CHILD); return p; |
1da177e4c Linux-2.6.12-rc2 |
1873 |
} |
e2761a116 [PATCH vfs-2.6 2/... |
1874 1875 1876 1877 1878 |
p = d_ancestor(p1, p2); if (p) { mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_PARENT); mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_CHILD); return p; |
1da177e4c Linux-2.6.12-rc2 |
1879 |
} |
f2eace23e [PATCH] lockdep: ... |
1880 1881 |
mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_PARENT); mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_CHILD); |
1da177e4c Linux-2.6.12-rc2 |
1882 1883 1884 1885 1886 |
return NULL; } void unlock_rename(struct dentry *p1, struct dentry *p2) { |
1b1dcc1b5 [PATCH] mutex sub... |
1887 |
mutex_unlock(&p1->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1888 |
if (p1 != p2) { |
1b1dcc1b5 [PATCH] mutex sub... |
1889 |
mutex_unlock(&p2->d_inode->i_mutex); |
a11f3a057 [PATCH] sem2mutex... |
1890 |
mutex_unlock(&p1->d_inode->i_sb->s_vfs_rename_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1891 1892 |
} } |
4acdaf27e switch ->create()... |
1893 |
int vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
1da177e4c Linux-2.6.12-rc2 |
1894 1895 |
struct nameidata *nd) { |
a95164d97 [patch 3/4] vfs: ... |
1896 |
int error = may_create(dir, dentry); |
1da177e4c Linux-2.6.12-rc2 |
1897 1898 1899 |
if (error) return error; |
acfa4380e inode->i_op is ne... |
1900 |
if (!dir->i_op->create) |
1da177e4c Linux-2.6.12-rc2 |
1901 1902 1903 1904 1905 1906 |
return -EACCES; /* shouldn't it be ENOSYS? */ mode &= S_IALLUGO; mode |= S_IFREG; error = security_inode_create(dir, dentry, mode); if (error) return error; |
1da177e4c Linux-2.6.12-rc2 |
1907 |
error = dir->i_op->create(dir, dentry, mode, nd); |
a74574aaf [PATCH] Remove se... |
1908 |
if (!error) |
f38aa9422 [PATCH] Pass dent... |
1909 |
fsnotify_create(dir, dentry); |
1da177e4c Linux-2.6.12-rc2 |
1910 1911 |
return error; } |
73d049a40 open-style analog... |
1912 |
static int may_open(struct path *path, int acc_mode, int flag) |
1da177e4c Linux-2.6.12-rc2 |
1913 |
{ |
3fb64190a pass a struct pat... |
1914 |
struct dentry *dentry = path->dentry; |
1da177e4c Linux-2.6.12-rc2 |
1915 1916 |
struct inode *inode = dentry->d_inode; int error; |
bcda76524 Allow O_PATH for ... |
1917 1918 1919 |
/* O_PATH? */ if (!acc_mode) return 0; |
1da177e4c Linux-2.6.12-rc2 |
1920 1921 |
if (!inode) return -ENOENT; |
c8fe8f30c cleanup may_open |
1922 1923 |
switch (inode->i_mode & S_IFMT) { case S_IFLNK: |
1da177e4c Linux-2.6.12-rc2 |
1924 |
return -ELOOP; |
c8fe8f30c cleanup may_open |
1925 1926 1927 1928 1929 1930 |
case S_IFDIR: if (acc_mode & MAY_WRITE) return -EISDIR; break; case S_IFBLK: case S_IFCHR: |
3fb64190a pass a struct pat... |
1931 |
if (path->mnt->mnt_flags & MNT_NODEV) |
1da177e4c Linux-2.6.12-rc2 |
1932 |
return -EACCES; |
c8fe8f30c cleanup may_open |
1933 1934 1935 |
/*FALLTHRU*/ case S_IFIFO: case S_IFSOCK: |
1da177e4c Linux-2.6.12-rc2 |
1936 |
flag &= ~O_TRUNC; |
c8fe8f30c cleanup may_open |
1937 |
break; |
4a3fd211c [PATCH] r/o bind ... |
1938 |
} |
b41572e92 r/o bind mounts: ... |
1939 |
|
3fb64190a pass a struct pat... |
1940 |
error = inode_permission(inode, acc_mode); |
b41572e92 r/o bind mounts: ... |
1941 1942 |
if (error) return error; |
6146f0d5e integrity: IMA hooks |
1943 |
|
1da177e4c Linux-2.6.12-rc2 |
1944 1945 1946 1947 |
/* * An append-only file must be opened in append mode for writing. */ if (IS_APPEND(inode)) { |
8737c9305 Switch may_open()... |
1948 |
if ((flag & O_ACCMODE) != O_RDONLY && !(flag & O_APPEND)) |
7715b5212 O_TRUNC open shou... |
1949 |
return -EPERM; |
1da177e4c Linux-2.6.12-rc2 |
1950 |
if (flag & O_TRUNC) |
7715b5212 O_TRUNC open shou... |
1951 |
return -EPERM; |
1da177e4c Linux-2.6.12-rc2 |
1952 1953 1954 |
} /* O_NOATIME can only be set by the owner or superuser */ |
2e1496707 userns: rename is... |
1955 |
if (flag & O_NOATIME && !inode_owner_or_capable(inode)) |
7715b5212 O_TRUNC open shou... |
1956 |
return -EPERM; |
1da177e4c Linux-2.6.12-rc2 |
1957 |
|
f3c7691e8 leases: fix write... |
1958 |
return 0; |
7715b5212 O_TRUNC open shou... |
1959 |
} |
1da177e4c Linux-2.6.12-rc2 |
1960 |
|
e1181ee65 vfs: pass struct ... |
1961 |
static int handle_truncate(struct file *filp) |
7715b5212 O_TRUNC open shou... |
1962 |
{ |
e1181ee65 vfs: pass struct ... |
1963 |
struct path *path = &filp->f_path; |
7715b5212 O_TRUNC open shou... |
1964 1965 1966 1967 1968 1969 1970 1971 1972 |
struct inode *inode = path->dentry->d_inode; int error = get_write_access(inode); if (error) return error; /* * Refuse to truncate files with mandatory locks held on them. */ error = locks_verify_locked(inode); if (!error) |
ea0d3ab23 LSM: Remove unuse... |
1973 |
error = security_path_truncate(path); |
7715b5212 O_TRUNC open shou... |
1974 1975 1976 |
if (!error) { error = do_truncate(path->dentry, 0, ATTR_MTIME|ATTR_CTIME|ATTR_OPEN, |
e1181ee65 vfs: pass struct ... |
1977 |
filp); |
7715b5212 O_TRUNC open shou... |
1978 1979 |
} put_write_access(inode); |
acd0c9351 IMA: update ima_c... |
1980 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
1981 |
} |
d57999e15 [PATCH] do namei_... |
1982 1983 |
static inline int open_to_namei_flags(int flag) { |
8a5e929dd don't translitera... |
1984 1985 |
if ((flag & O_ACCMODE) == 3) flag--; |
d57999e15 [PATCH] do namei_... |
1986 1987 |
return flag; } |
31e6b01f4 fs: rcu-walk for ... |
1988 |
/* |
fe2d35ff0 switch non-create... |
1989 |
* Handle the last step of open() |
31e6b01f4 fs: rcu-walk for ... |
1990 |
*/ |
fb1cc555d gut do_filp_open(... |
1991 |
static struct file *do_last(struct nameidata *nd, struct path *path, |
c3e380b0b Collect "operatio... |
1992 |
const struct open_flags *op, const char *pathname) |
fb1cc555d gut do_filp_open(... |
1993 |
{ |
a1e28038d pull the common p... |
1994 |
struct dentry *dir = nd->path.dentry; |
6c0d46c49 fold __open_namei... |
1995 |
struct dentry *dentry; |
ca344a894 do_last: unify ma... |
1996 |
int open_flag = op->open_flag; |
6c0d46c49 fold __open_namei... |
1997 |
int will_truncate = open_flag & O_TRUNC; |
ca344a894 do_last: unify ma... |
1998 |
int want_write = 0; |
bcda76524 Allow O_PATH for ... |
1999 |
int acc_mode = op->acc_mode; |
fb1cc555d gut do_filp_open(... |
2000 |
struct file *filp; |
16c2cd717 untangle the "nee... |
2001 |
int error; |
1f36f774b Switch !O_CREAT c... |
2002 |
|
c3e380b0b Collect "operatio... |
2003 2004 |
nd->flags &= ~LOOKUP_PARENT; nd->flags |= op->intent; |
1f36f774b Switch !O_CREAT c... |
2005 2006 |
switch (nd->last_type) { case LAST_DOTDOT: |
176306f59 VFS: fix recent b... |
2007 |
case LAST_DOT: |
fe2d35ff0 switch non-create... |
2008 2009 2010 |
error = handle_dots(nd, nd->last_type); if (error) return ERR_PTR(error); |
1f36f774b Switch !O_CREAT c... |
2011 |
/* fallthrough */ |
1f36f774b Switch !O_CREAT c... |
2012 |
case LAST_ROOT: |
9f1fafee9 merge handle_reva... |
2013 |
error = complete_walk(nd); |
16c2cd717 untangle the "nee... |
2014 |
if (error) |
9f1fafee9 merge handle_reva... |
2015 |
return ERR_PTR(error); |
fe2d35ff0 switch non-create... |
2016 |
audit_inode(pathname, nd->path.dentry); |
ca344a894 do_last: unify ma... |
2017 |
if (open_flag & O_CREAT) { |
fe2d35ff0 switch non-create... |
2018 2019 2020 2021 |
error = -EISDIR; goto exit; } goto ok; |
1f36f774b Switch !O_CREAT c... |
2022 |
case LAST_BIND: |
9f1fafee9 merge handle_reva... |
2023 |
error = complete_walk(nd); |
16c2cd717 untangle the "nee... |
2024 |
if (error) |
9f1fafee9 merge handle_reva... |
2025 |
return ERR_PTR(error); |
1f36f774b Switch !O_CREAT c... |
2026 |
audit_inode(pathname, dir); |
67ee3ad21 Pull handling of ... |
2027 |
goto ok; |
1f36f774b Switch !O_CREAT c... |
2028 |
} |
67ee3ad21 Pull handling of ... |
2029 |
|
ca344a894 do_last: unify ma... |
2030 |
if (!(open_flag & O_CREAT)) { |
bcda76524 Allow O_PATH for ... |
2031 |
int symlink_ok = 0; |
fe2d35ff0 switch non-create... |
2032 2033 |
if (nd->last.name[nd->last.len]) nd->flags |= LOOKUP_FOLLOW | LOOKUP_DIRECTORY; |
bcda76524 Allow O_PATH for ... |
2034 2035 |
if (open_flag & O_PATH && !(nd->flags & LOOKUP_FOLLOW)) symlink_ok = 1; |
fe2d35ff0 switch non-create... |
2036 |
/* we _can_ be in RCU mode here */ |
ce57dfc17 pull handling of ... |
2037 2038 2039 |
error = walk_component(nd, path, &nd->last, LAST_NORM, !symlink_ok); if (error < 0) |
fe2d35ff0 switch non-create... |
2040 |
return ERR_PTR(error); |
ce57dfc17 pull handling of ... |
2041 |
if (error) /* symlink */ |
fe2d35ff0 switch non-create... |
2042 |
return NULL; |
fe2d35ff0 switch non-create... |
2043 |
/* sayonara */ |
9f1fafee9 merge handle_reva... |
2044 2045 2046 |
error = complete_walk(nd); if (error) return ERR_PTR(-ECHILD); |
fe2d35ff0 switch non-create... |
2047 2048 2049 |
error = -ENOTDIR; if (nd->flags & LOOKUP_DIRECTORY) { |
ce57dfc17 pull handling of ... |
2050 |
if (!nd->inode->i_op->lookup) |
fe2d35ff0 switch non-create... |
2051 2052 2053 2054 2055 2056 2057 |
goto exit; } audit_inode(pathname, nd->path.dentry); goto ok; } /* create side of things */ |
a3fbbde70 VFS: we need to s... |
2058 2059 2060 2061 |
/* * This will *only* deal with leaving RCU mode - LOOKUP_JUMPED has been * cleared when we got to the last component we are about to look up */ |
9f1fafee9 merge handle_reva... |
2062 2063 2064 |
error = complete_walk(nd); if (error) return ERR_PTR(error); |
fe2d35ff0 switch non-create... |
2065 2066 |
audit_inode(pathname, dir); |
16c2cd717 untangle the "nee... |
2067 |
error = -EISDIR; |
1f36f774b Switch !O_CREAT c... |
2068 |
/* trailing slashes? */ |
31e6b01f4 fs: rcu-walk for ... |
2069 2070 |
if (nd->last.name[nd->last.len]) goto exit; |
a2c36b450 pull more into do... |
2071 |
|
a1e28038d pull the common p... |
2072 |
mutex_lock(&dir->d_inode->i_mutex); |
6c0d46c49 fold __open_namei... |
2073 2074 2075 |
dentry = lookup_hash(nd); error = PTR_ERR(dentry); if (IS_ERR(dentry)) { |
fb1cc555d gut do_filp_open(... |
2076 2077 2078 |
mutex_unlock(&dir->d_inode->i_mutex); goto exit; } |
6c0d46c49 fold __open_namei... |
2079 2080 |
path->dentry = dentry; path->mnt = nd->path.mnt; |
fb1cc555d gut do_filp_open(... |
2081 |
/* Negative dentry, just create the file */ |
6c0d46c49 fold __open_namei... |
2082 |
if (!dentry->d_inode) { |
a218d0fdc switch open and m... |
2083 |
umode_t mode = op->mode; |
6c0d46c49 fold __open_namei... |
2084 2085 |
if (!IS_POSIXACL(dir->d_inode)) mode &= ~current_umask(); |
fb1cc555d gut do_filp_open(... |
2086 2087 |
/* * This write is needed to ensure that a |
6c0d46c49 fold __open_namei... |
2088 |
* rw->ro transition does not occur between |
fb1cc555d gut do_filp_open(... |
2089 2090 2091 2092 2093 2094 2095 |
* the time when the file is created and when * a permanent write count is taken through * the 'struct file' in nameidata_to_filp(). */ error = mnt_want_write(nd->path.mnt); if (error) goto exit_mutex_unlock; |
ca344a894 do_last: unify ma... |
2096 |
want_write = 1; |
9b44f1b39 move may_open() f... |
2097 |
/* Don't check for write permission, don't truncate */ |
ca344a894 do_last: unify ma... |
2098 |
open_flag &= ~O_TRUNC; |
6c0d46c49 fold __open_namei... |
2099 |
will_truncate = 0; |
bcda76524 Allow O_PATH for ... |
2100 |
acc_mode = MAY_OPEN; |
6c0d46c49 fold __open_namei... |
2101 2102 2103 2104 2105 2106 2107 2108 2109 |
error = security_path_mknod(&nd->path, dentry, mode, 0); if (error) goto exit_mutex_unlock; error = vfs_create(dir->d_inode, dentry, mode, nd); if (error) goto exit_mutex_unlock; mutex_unlock(&dir->d_inode->i_mutex); dput(nd->path.dentry); nd->path.dentry = dentry; |
ca344a894 do_last: unify ma... |
2110 |
goto common; |
fb1cc555d gut do_filp_open(... |
2111 2112 2113 2114 2115 2116 2117 2118 2119 |
} /* * It already exists. */ mutex_unlock(&dir->d_inode->i_mutex); audit_inode(pathname, path->dentry); error = -EEXIST; |
ca344a894 do_last: unify ma... |
2120 |
if (open_flag & O_EXCL) |
fb1cc555d gut do_filp_open(... |
2121 |
goto exit_dput; |
9875cf806 Add a dentry op t... |
2122 2123 2124 |
error = follow_managed(path, nd->flags); if (error < 0) goto exit_dput; |
fb1cc555d gut do_filp_open(... |
2125 |
|
a3fbbde70 VFS: we need to s... |
2126 2127 |
if (error) nd->flags |= LOOKUP_JUMPED; |
fb1cc555d gut do_filp_open(... |
2128 2129 2130 |
error = -ENOENT; if (!path->dentry->d_inode) goto exit_dput; |
9e67f3616 Kill is_link argu... |
2131 2132 |
if (path->dentry->d_inode->i_op->follow_link) |
fb1cc555d gut do_filp_open(... |
2133 |
return NULL; |
fb1cc555d gut do_filp_open(... |
2134 2135 |
path_to_nameidata(path, nd); |
31e6b01f4 fs: rcu-walk for ... |
2136 |
nd->inode = path->dentry->d_inode; |
a3fbbde70 VFS: we need to s... |
2137 2138 2139 2140 |
/* Why this, you ask? _Now_ we might have grown LOOKUP_JUMPED... */ error = complete_walk(nd); if (error) goto exit; |
fb1cc555d gut do_filp_open(... |
2141 |
error = -EISDIR; |
31e6b01f4 fs: rcu-walk for ... |
2142 |
if (S_ISDIR(nd->inode->i_mode)) |
fb1cc555d gut do_filp_open(... |
2143 |
goto exit; |
67ee3ad21 Pull handling of ... |
2144 |
ok: |
6c0d46c49 fold __open_namei... |
2145 2146 |
if (!S_ISREG(nd->inode->i_mode)) will_truncate = 0; |
0f9d1a10c expand finish_ope... |
2147 2148 2149 2150 |
if (will_truncate) { error = mnt_want_write(nd->path.mnt); if (error) goto exit; |
ca344a894 do_last: unify ma... |
2151 |
want_write = 1; |
0f9d1a10c expand finish_ope... |
2152 |
} |
ca344a894 do_last: unify ma... |
2153 |
common: |
bcda76524 Allow O_PATH for ... |
2154 |
error = may_open(&nd->path, acc_mode, open_flag); |
ca344a894 do_last: unify ma... |
2155 |
if (error) |
0f9d1a10c expand finish_ope... |
2156 |
goto exit; |
0f9d1a10c expand finish_ope... |
2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 |
filp = nameidata_to_filp(nd); if (!IS_ERR(filp)) { error = ima_file_check(filp, op->acc_mode); if (error) { fput(filp); filp = ERR_PTR(error); } } if (!IS_ERR(filp)) { if (will_truncate) { error = handle_truncate(filp); if (error) { fput(filp); filp = ERR_PTR(error); } } } |
ca344a894 do_last: unify ma... |
2174 2175 |
out: if (want_write) |
0f9d1a10c expand finish_ope... |
2176 2177 |
mnt_drop_write(nd->path.mnt); path_put(&nd->path); |
fb1cc555d gut do_filp_open(... |
2178 2179 2180 2181 2182 2183 2184 |
return filp; exit_mutex_unlock: mutex_unlock(&dir->d_inode->i_mutex); exit_dput: path_put_conditional(path, nd); exit: |
ca344a894 do_last: unify ma... |
2185 2186 |
filp = ERR_PTR(error); goto out; |
fb1cc555d gut do_filp_open(... |
2187 |
} |
13aab428a separate -ESTALE/... |
2188 |
static struct file *path_openat(int dfd, const char *pathname, |
73d049a40 open-style analog... |
2189 |
struct nameidata *nd, const struct open_flags *op, int flags) |
1da177e4c Linux-2.6.12-rc2 |
2190 |
{ |
fe2d35ff0 switch non-create... |
2191 |
struct file *base = NULL; |
4a3fd211c [PATCH] r/o bind ... |
2192 |
struct file *filp; |
9850c0565 Fix the -ESTALE h... |
2193 |
struct path path; |
13aab428a separate -ESTALE/... |
2194 |
int error; |
31e6b01f4 fs: rcu-walk for ... |
2195 2196 2197 2198 |
filp = get_empty_filp(); if (!filp) return ERR_PTR(-ENFILE); |
47c805dc2 switch do_filp_op... |
2199 |
filp->f_flags = op->open_flag; |
73d049a40 open-style analog... |
2200 2201 2202 |
nd->intent.open.file = filp; nd->intent.open.flags = open_to_namei_flags(op->open_flag); nd->intent.open.create_mode = op->mode; |
31e6b01f4 fs: rcu-walk for ... |
2203 |
|
73d049a40 open-style analog... |
2204 |
error = path_init(dfd, pathname, flags | LOOKUP_PARENT, nd, &base); |
31e6b01f4 fs: rcu-walk for ... |
2205 |
if (unlikely(error)) |
13aab428a separate -ESTALE/... |
2206 |
goto out_filp; |
31e6b01f4 fs: rcu-walk for ... |
2207 |
|
fe2d35ff0 switch non-create... |
2208 |
current->total_link_count = 0; |
73d049a40 open-style analog... |
2209 |
error = link_path_walk(pathname, nd); |
31e6b01f4 fs: rcu-walk for ... |
2210 2211 |
if (unlikely(error)) goto out_filp; |
1da177e4c Linux-2.6.12-rc2 |
2212 |
|
73d049a40 open-style analog... |
2213 |
filp = do_last(nd, &path, op, pathname); |
806b681cb Turn do_link spag... |
2214 |
while (unlikely(!filp)) { /* trailing symlink */ |
7b9337aaf fs: namei fix ->p... |
2215 |
struct path link = path; |
def4af30c Get rid of symlin... |
2216 |
void *cookie; |
574197e0d tidy the trailing... |
2217 |
if (!(nd->flags & LOOKUP_FOLLOW)) { |
73d049a40 open-style analog... |
2218 2219 |
path_put_conditional(&path, nd); path_put(&nd->path); |
40b39136f path_openat: clea... |
2220 2221 2222 |
filp = ERR_PTR(-ELOOP); break; } |
73d049a40 open-style analog... |
2223 2224 |
nd->flags |= LOOKUP_PARENT; nd->flags &= ~(LOOKUP_OPEN|LOOKUP_CREATE|LOOKUP_EXCL); |
574197e0d tidy the trailing... |
2225 |
error = follow_link(&link, nd, &cookie); |
c3e380b0b Collect "operatio... |
2226 |
if (unlikely(error)) |
f1afe9efc clean up the fail... |
2227 |
filp = ERR_PTR(error); |
c3e380b0b Collect "operatio... |
2228 |
else |
73d049a40 open-style analog... |
2229 |
filp = do_last(nd, &path, op, pathname); |
574197e0d tidy the trailing... |
2230 |
put_link(nd, &link, cookie); |
806b681cb Turn do_link spag... |
2231 |
} |
10fa8e62f Unify exits in O_... |
2232 |
out: |
73d049a40 open-style analog... |
2233 2234 |
if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) path_put(&nd->root); |
fe2d35ff0 switch non-create... |
2235 2236 |
if (base) fput(base); |
73d049a40 open-style analog... |
2237 |
release_open_intent(nd); |
10fa8e62f Unify exits in O_... |
2238 |
return filp; |
1da177e4c Linux-2.6.12-rc2 |
2239 |
|
31e6b01f4 fs: rcu-walk for ... |
2240 |
out_filp: |
806b681cb Turn do_link spag... |
2241 |
filp = ERR_PTR(error); |
10fa8e62f Unify exits in O_... |
2242 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
2243 |
} |
13aab428a separate -ESTALE/... |
2244 2245 2246 |
struct file *do_filp_open(int dfd, const char *pathname, const struct open_flags *op, int flags) { |
73d049a40 open-style analog... |
2247 |
struct nameidata nd; |
13aab428a separate -ESTALE/... |
2248 |
struct file *filp; |
73d049a40 open-style analog... |
2249 |
filp = path_openat(dfd, pathname, &nd, op, flags | LOOKUP_RCU); |
13aab428a separate -ESTALE/... |
2250 |
if (unlikely(filp == ERR_PTR(-ECHILD))) |
73d049a40 open-style analog... |
2251 |
filp = path_openat(dfd, pathname, &nd, op, flags); |
13aab428a separate -ESTALE/... |
2252 |
if (unlikely(filp == ERR_PTR(-ESTALE))) |
73d049a40 open-style analog... |
2253 |
filp = path_openat(dfd, pathname, &nd, op, flags | LOOKUP_REVAL); |
13aab428a separate -ESTALE/... |
2254 2255 |
return filp; } |
73d049a40 open-style analog... |
2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 |
struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt, const char *name, const struct open_flags *op, int flags) { struct nameidata nd; struct file *file; nd.root.mnt = mnt; nd.root.dentry = dentry; flags |= LOOKUP_ROOT; |
bcda76524 Allow O_PATH for ... |
2266 |
if (dentry->d_inode->i_op->follow_link && op->intent & LOOKUP_OPEN) |
73d049a40 open-style analog... |
2267 2268 2269 2270 2271 2272 2273 2274 2275 |
return ERR_PTR(-ELOOP); file = path_openat(-1, name, &nd, op, flags | LOOKUP_RCU); if (unlikely(file == ERR_PTR(-ECHILD))) file = path_openat(-1, name, &nd, op, flags); if (unlikely(file == ERR_PTR(-ESTALE))) file = path_openat(-1, name, &nd, op, flags | LOOKUP_REVAL); return file; } |
ed75e95de kill lookup_create() |
2276 |
struct dentry *kern_path_create(int dfd, const char *pathname, struct path *path, int is_dir) |
1da177e4c Linux-2.6.12-rc2 |
2277 |
{ |
c663e5d80 [PATCH] add some ... |
2278 |
struct dentry *dentry = ERR_PTR(-EEXIST); |
ed75e95de kill lookup_create() |
2279 2280 2281 2282 |
struct nameidata nd; int error = do_path_lookup(dfd, pathname, LOOKUP_PARENT, &nd); if (error) return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
2283 |
|
c663e5d80 [PATCH] add some ... |
2284 2285 2286 2287 |
/* * Yucky last component or no last component at all? * (foo/., foo/.., /////) */ |
ed75e95de kill lookup_create() |
2288 2289 2290 2291 2292 |
if (nd.last_type != LAST_NORM) goto out; nd.flags &= ~LOOKUP_PARENT; nd.flags |= LOOKUP_CREATE | LOOKUP_EXCL; nd.intent.open.flags = O_EXCL; |
c663e5d80 [PATCH] add some ... |
2293 2294 2295 2296 |
/* * Do the final lookup. */ |
ed75e95de kill lookup_create() |
2297 2298 |
mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); dentry = lookup_hash(&nd); |
1da177e4c Linux-2.6.12-rc2 |
2299 2300 |
if (IS_ERR(dentry)) goto fail; |
c663e5d80 [PATCH] add some ... |
2301 |
|
e9baf6e59 [PATCH] return to... |
2302 2303 |
if (dentry->d_inode) goto eexist; |
c663e5d80 [PATCH] add some ... |
2304 2305 2306 2307 2308 2309 |
/* * Special case - lookup gave negative, but... we had foo/bar/ * From the vfs_mknod() POV we just have a negative dentry - * all is fine. Let's be bastards - you had / on the end, you've * been asking for (non-existent) directory. -ENOENT for you. */ |
ed75e95de kill lookup_create() |
2310 |
if (unlikely(!is_dir && nd.last.name[nd.last.len])) { |
e9baf6e59 [PATCH] return to... |
2311 2312 |
dput(dentry); dentry = ERR_PTR(-ENOENT); |
ed75e95de kill lookup_create() |
2313 |
goto fail; |
e9baf6e59 [PATCH] return to... |
2314 |
} |
ed75e95de kill lookup_create() |
2315 |
*path = nd.path; |
1da177e4c Linux-2.6.12-rc2 |
2316 |
return dentry; |
e9baf6e59 [PATCH] return to... |
2317 |
eexist: |
1da177e4c Linux-2.6.12-rc2 |
2318 |
dput(dentry); |
e9baf6e59 [PATCH] return to... |
2319 |
dentry = ERR_PTR(-EEXIST); |
1da177e4c Linux-2.6.12-rc2 |
2320 |
fail: |
ed75e95de kill lookup_create() |
2321 2322 2323 |
mutex_unlock(&nd.path.dentry->d_inode->i_mutex); out: path_put(&nd.path); |
1da177e4c Linux-2.6.12-rc2 |
2324 2325 |
return dentry; } |
dae6ad8f3 new helpers: kern... |
2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 |
EXPORT_SYMBOL(kern_path_create); struct dentry *user_path_create(int dfd, const char __user *pathname, struct path *path, int is_dir) { char *tmp = getname(pathname); struct dentry *res; if (IS_ERR(tmp)) return ERR_CAST(tmp); res = kern_path_create(dfd, tmp, path, is_dir); putname(tmp); return res; } EXPORT_SYMBOL(user_path_create); |
1a67aafb5 switch ->mknod() ... |
2339 |
int vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
1da177e4c Linux-2.6.12-rc2 |
2340 |
{ |
a95164d97 [patch 3/4] vfs: ... |
2341 |
int error = may_create(dir, dentry); |
1da177e4c Linux-2.6.12-rc2 |
2342 2343 2344 |
if (error) return error; |
e795b7179 userns: userns: c... |
2345 2346 |
if ((S_ISCHR(mode) || S_ISBLK(mode)) && !ns_capable(inode_userns(dir), CAP_MKNOD)) |
1da177e4c Linux-2.6.12-rc2 |
2347 |
return -EPERM; |
acfa4380e inode->i_op is ne... |
2348 |
if (!dir->i_op->mknod) |
1da177e4c Linux-2.6.12-rc2 |
2349 |
return -EPERM; |
08ce5f16e cgroups: implemen... |
2350 2351 2352 |
error = devcgroup_inode_mknod(mode, dev); if (error) return error; |
1da177e4c Linux-2.6.12-rc2 |
2353 2354 2355 |
error = security_inode_mknod(dir, dentry, mode, dev); if (error) return error; |
1da177e4c Linux-2.6.12-rc2 |
2356 |
error = dir->i_op->mknod(dir, dentry, mode, dev); |
a74574aaf [PATCH] Remove se... |
2357 |
if (!error) |
f38aa9422 [PATCH] Pass dent... |
2358 |
fsnotify_create(dir, dentry); |
1da177e4c Linux-2.6.12-rc2 |
2359 2360 |
return error; } |
f69aac000 switch may_mknod(... |
2361 |
static int may_mknod(umode_t mode) |
463c31972 [PATCH] r/o bind ... |
2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 |
{ switch (mode & S_IFMT) { case S_IFREG: case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK: case 0: /* zero mode translates to S_IFREG */ return 0; case S_IFDIR: return -EPERM; default: return -EINVAL; } } |
8208a22bb switch sys_mknoda... |
2377 |
SYSCALL_DEFINE4(mknodat, int, dfd, const char __user *, filename, umode_t, mode, |
2e4d0924e [CVE-2009-0029] S... |
2378 |
unsigned, dev) |
1da177e4c Linux-2.6.12-rc2 |
2379 |
{ |
2ad94ae65 [PATCH] new (loca... |
2380 |
struct dentry *dentry; |
dae6ad8f3 new helpers: kern... |
2381 2382 |
struct path path; int error; |
1da177e4c Linux-2.6.12-rc2 |
2383 2384 2385 |
if (S_ISDIR(mode)) return -EPERM; |
1da177e4c Linux-2.6.12-rc2 |
2386 |
|
dae6ad8f3 new helpers: kern... |
2387 2388 2389 |
dentry = user_path_create(dfd, filename, &path, 0); if (IS_ERR(dentry)) return PTR_ERR(dentry); |
2ad94ae65 [PATCH] new (loca... |
2390 |
|
dae6ad8f3 new helpers: kern... |
2391 |
if (!IS_POSIXACL(path.dentry->d_inode)) |
ce3b0f8d5 New helper - curr... |
2392 |
mode &= ~current_umask(); |
463c31972 [PATCH] r/o bind ... |
2393 2394 2395 |
error = may_mknod(mode); if (error) goto out_dput; |
dae6ad8f3 new helpers: kern... |
2396 |
error = mnt_want_write(path.mnt); |
463c31972 [PATCH] r/o bind ... |
2397 2398 |
if (error) goto out_dput; |
dae6ad8f3 new helpers: kern... |
2399 |
error = security_path_mknod(&path, dentry, mode, dev); |
be6d3e56a introduce new LSM... |
2400 2401 |
if (error) goto out_drop_write; |
463c31972 [PATCH] r/o bind ... |
2402 |
switch (mode & S_IFMT) { |
1da177e4c Linux-2.6.12-rc2 |
2403 |
case 0: case S_IFREG: |
dae6ad8f3 new helpers: kern... |
2404 |
error = vfs_create(path.dentry->d_inode,dentry,mode,NULL); |
1da177e4c Linux-2.6.12-rc2 |
2405 2406 |
break; case S_IFCHR: case S_IFBLK: |
dae6ad8f3 new helpers: kern... |
2407 |
error = vfs_mknod(path.dentry->d_inode,dentry,mode, |
1da177e4c Linux-2.6.12-rc2 |
2408 2409 2410 |
new_decode_dev(dev)); break; case S_IFIFO: case S_IFSOCK: |
dae6ad8f3 new helpers: kern... |
2411 |
error = vfs_mknod(path.dentry->d_inode,dentry,mode,0); |
1da177e4c Linux-2.6.12-rc2 |
2412 |
break; |
1da177e4c Linux-2.6.12-rc2 |
2413 |
} |
be6d3e56a introduce new LSM... |
2414 |
out_drop_write: |
dae6ad8f3 new helpers: kern... |
2415 |
mnt_drop_write(path.mnt); |
463c31972 [PATCH] r/o bind ... |
2416 2417 |
out_dput: dput(dentry); |
dae6ad8f3 new helpers: kern... |
2418 2419 |
mutex_unlock(&path.dentry->d_inode->i_mutex); path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
2420 2421 2422 |
return error; } |
8208a22bb switch sys_mknoda... |
2423 |
SYSCALL_DEFINE3(mknod, const char __user *, filename, umode_t, mode, unsigned, dev) |
5590ff0d5 [PATCH] vfs: *at ... |
2424 2425 2426 |
{ return sys_mknodat(AT_FDCWD, filename, mode, dev); } |
18bb1db3e switch vfs_mkdir(... |
2427 |
int vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4c Linux-2.6.12-rc2 |
2428 |
{ |
a95164d97 [patch 3/4] vfs: ... |
2429 |
int error = may_create(dir, dentry); |
1da177e4c Linux-2.6.12-rc2 |
2430 2431 2432 |
if (error) return error; |
acfa4380e inode->i_op is ne... |
2433 |
if (!dir->i_op->mkdir) |
1da177e4c Linux-2.6.12-rc2 |
2434 2435 2436 2437 2438 2439 |
return -EPERM; mode &= (S_IRWXUGO|S_ISVTX); error = security_inode_mkdir(dir, dentry, mode); if (error) return error; |
1da177e4c Linux-2.6.12-rc2 |
2440 |
error = dir->i_op->mkdir(dir, dentry, mode); |
a74574aaf [PATCH] Remove se... |
2441 |
if (!error) |
f38aa9422 [PATCH] Pass dent... |
2442 |
fsnotify_mkdir(dir, dentry); |
1da177e4c Linux-2.6.12-rc2 |
2443 2444 |
return error; } |
a218d0fdc switch open and m... |
2445 |
SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode) |
1da177e4c Linux-2.6.12-rc2 |
2446 |
{ |
6902d925d [PATCH] r/o bind ... |
2447 |
struct dentry *dentry; |
dae6ad8f3 new helpers: kern... |
2448 2449 |
struct path path; int error; |
1da177e4c Linux-2.6.12-rc2 |
2450 |
|
dae6ad8f3 new helpers: kern... |
2451 |
dentry = user_path_create(dfd, pathname, &path, 1); |
6902d925d [PATCH] r/o bind ... |
2452 |
if (IS_ERR(dentry)) |
dae6ad8f3 new helpers: kern... |
2453 |
return PTR_ERR(dentry); |
1da177e4c Linux-2.6.12-rc2 |
2454 |
|
dae6ad8f3 new helpers: kern... |
2455 |
if (!IS_POSIXACL(path.dentry->d_inode)) |
ce3b0f8d5 New helper - curr... |
2456 |
mode &= ~current_umask(); |
dae6ad8f3 new helpers: kern... |
2457 |
error = mnt_want_write(path.mnt); |
463c31972 [PATCH] r/o bind ... |
2458 2459 |
if (error) goto out_dput; |
dae6ad8f3 new helpers: kern... |
2460 |
error = security_path_mkdir(&path, dentry, mode); |
be6d3e56a introduce new LSM... |
2461 2462 |
if (error) goto out_drop_write; |
dae6ad8f3 new helpers: kern... |
2463 |
error = vfs_mkdir(path.dentry->d_inode, dentry, mode); |
be6d3e56a introduce new LSM... |
2464 |
out_drop_write: |
dae6ad8f3 new helpers: kern... |
2465 |
mnt_drop_write(path.mnt); |
463c31972 [PATCH] r/o bind ... |
2466 |
out_dput: |
6902d925d [PATCH] r/o bind ... |
2467 |
dput(dentry); |
dae6ad8f3 new helpers: kern... |
2468 2469 |
mutex_unlock(&path.dentry->d_inode->i_mutex); path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
2470 2471 |
return error; } |
a218d0fdc switch open and m... |
2472 |
SYSCALL_DEFINE2(mkdir, const char __user *, pathname, umode_t, mode) |
5590ff0d5 [PATCH] vfs: *at ... |
2473 2474 2475 |
{ return sys_mkdirat(AT_FDCWD, pathname, mode); } |
1da177e4c Linux-2.6.12-rc2 |
2476 |
/* |
a71905f0d vfs: update dentr... |
2477 2478 2479 2480 |
* The dentry_unhash() helper will try to drop the dentry early: we * should have a usage count of 2 if we're the only user of this * dentry, and if that is true (possibly after pruning the dcache), * then we drop the dentry now. |
1da177e4c Linux-2.6.12-rc2 |
2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 |
* * A low-level filesystem can, if it choses, legally * do a * * if (!d_unhashed(dentry)) * return -EBUSY; * * if it cannot handle the case of removing a directory * that is still in use by something else.. */ void dentry_unhash(struct dentry *dentry) { |
dc168427e [PATCH] VFS: extr... |
2493 |
shrink_dcache_parent(dentry); |
1da177e4c Linux-2.6.12-rc2 |
2494 |
spin_lock(&dentry->d_lock); |
64252c75a vfs: remove dget(... |
2495 |
if (dentry->d_count == 1) |
1da177e4c Linux-2.6.12-rc2 |
2496 2497 |
__d_drop(dentry); spin_unlock(&dentry->d_lock); |
1da177e4c Linux-2.6.12-rc2 |
2498 2499 2500 2501 2502 2503 2504 2505 |
} int vfs_rmdir(struct inode *dir, struct dentry *dentry) { int error = may_delete(dir, dentry, 1); if (error) return error; |
acfa4380e inode->i_op is ne... |
2506 |
if (!dir->i_op->rmdir) |
1da177e4c Linux-2.6.12-rc2 |
2507 |
return -EPERM; |
1d2ef5901 restore pinning t... |
2508 |
dget(dentry); |
1b1dcc1b5 [PATCH] mutex sub... |
2509 |
mutex_lock(&dentry->d_inode->i_mutex); |
912dbc15d vfs: clean up vfs... |
2510 2511 |
error = -EBUSY; |
1da177e4c Linux-2.6.12-rc2 |
2512 |
if (d_mountpoint(dentry)) |
912dbc15d vfs: clean up vfs... |
2513 2514 2515 2516 2517 |
goto out; error = security_inode_rmdir(dir, dentry); if (error) goto out; |
3cebde241 vfs: shrink_dcach... |
2518 |
shrink_dcache_parent(dentry); |
912dbc15d vfs: clean up vfs... |
2519 2520 2521 2522 2523 2524 2525 2526 |
error = dir->i_op->rmdir(dir, dentry); if (error) goto out; dentry->d_inode->i_flags |= S_DEAD; dont_mount(dentry); out: |
1b1dcc1b5 [PATCH] mutex sub... |
2527 |
mutex_unlock(&dentry->d_inode->i_mutex); |
1d2ef5901 restore pinning t... |
2528 |
dput(dentry); |
912dbc15d vfs: clean up vfs... |
2529 |
if (!error) |
1da177e4c Linux-2.6.12-rc2 |
2530 |
d_delete(dentry); |
1da177e4c Linux-2.6.12-rc2 |
2531 2532 |
return error; } |
5590ff0d5 [PATCH] vfs: *at ... |
2533 |
static long do_rmdir(int dfd, const char __user *pathname) |
1da177e4c Linux-2.6.12-rc2 |
2534 2535 2536 2537 2538 |
{ int error = 0; char * name; struct dentry *dentry; struct nameidata nd; |
2ad94ae65 [PATCH] new (loca... |
2539 |
error = user_path_parent(dfd, pathname, &nd, &name); |
1da177e4c Linux-2.6.12-rc2 |
2540 |
if (error) |
2ad94ae65 [PATCH] new (loca... |
2541 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
2542 2543 |
switch(nd.last_type) { |
0612d9fb2 [PATCH vfs-2.6 5/... |
2544 2545 2546 2547 2548 2549 2550 2551 2552 |
case LAST_DOTDOT: error = -ENOTEMPTY; goto exit1; case LAST_DOT: error = -EINVAL; goto exit1; case LAST_ROOT: error = -EBUSY; goto exit1; |
1da177e4c Linux-2.6.12-rc2 |
2553 |
} |
0612d9fb2 [PATCH vfs-2.6 5/... |
2554 2555 |
nd.flags &= ~LOOKUP_PARENT; |
4ac913785 Embed a struct pa... |
2556 |
mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); |
49705b774 [PATCH] sanitize ... |
2557 |
dentry = lookup_hash(&nd); |
1da177e4c Linux-2.6.12-rc2 |
2558 |
error = PTR_ERR(dentry); |
6902d925d [PATCH] r/o bind ... |
2559 2560 |
if (IS_ERR(dentry)) goto exit2; |
e6bc45d65 vfs: make unlink(... |
2561 2562 2563 2564 |
if (!dentry->d_inode) { error = -ENOENT; goto exit3; } |
0622753b8 [PATCH] r/o bind ... |
2565 2566 2567 |
error = mnt_want_write(nd.path.mnt); if (error) goto exit3; |
be6d3e56a introduce new LSM... |
2568 2569 2570 |
error = security_path_rmdir(&nd.path, dentry); if (error) goto exit4; |
4ac913785 Embed a struct pa... |
2571 |
error = vfs_rmdir(nd.path.dentry->d_inode, dentry); |
be6d3e56a introduce new LSM... |
2572 |
exit4: |
0622753b8 [PATCH] r/o bind ... |
2573 2574 |
mnt_drop_write(nd.path.mnt); exit3: |
6902d925d [PATCH] r/o bind ... |
2575 2576 |
dput(dentry); exit2: |
4ac913785 Embed a struct pa... |
2577 |
mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2578 |
exit1: |
1d957f9bf Introduce path_put() |
2579 |
path_put(&nd.path); |
1da177e4c Linux-2.6.12-rc2 |
2580 2581 2582 |
putname(name); return error; } |
3cdad4288 [CVE-2009-0029] S... |
2583 |
SYSCALL_DEFINE1(rmdir, const char __user *, pathname) |
5590ff0d5 [PATCH] vfs: *at ... |
2584 2585 2586 |
{ return do_rmdir(AT_FDCWD, pathname); } |
1da177e4c Linux-2.6.12-rc2 |
2587 2588 2589 2590 2591 2592 |
int vfs_unlink(struct inode *dir, struct dentry *dentry) { int error = may_delete(dir, dentry, 0); if (error) return error; |
acfa4380e inode->i_op is ne... |
2593 |
if (!dir->i_op->unlink) |
1da177e4c Linux-2.6.12-rc2 |
2594 |
return -EPERM; |
1b1dcc1b5 [PATCH] mutex sub... |
2595 |
mutex_lock(&dentry->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2596 2597 2598 2599 |
if (d_mountpoint(dentry)) error = -EBUSY; else { error = security_inode_unlink(dir, dentry); |
bec1052e5 set S_DEAD on unl... |
2600 |
if (!error) { |
1da177e4c Linux-2.6.12-rc2 |
2601 |
error = dir->i_op->unlink(dir, dentry); |
bec1052e5 set S_DEAD on unl... |
2602 |
if (!error) |
d83c49f3e Fix the regressio... |
2603 |
dont_mount(dentry); |
bec1052e5 set S_DEAD on unl... |
2604 |
} |
1da177e4c Linux-2.6.12-rc2 |
2605 |
} |
1b1dcc1b5 [PATCH] mutex sub... |
2606 |
mutex_unlock(&dentry->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2607 2608 2609 |
/* We don't d_delete() NFS sillyrenamed files--they still exist. */ if (!error && !(dentry->d_flags & DCACHE_NFSFS_RENAMED)) { |
ece95912d inotify: send IN_... |
2610 |
fsnotify_link_count(dentry->d_inode); |
e234f35c5 [PATCH] inotify d... |
2611 |
d_delete(dentry); |
1da177e4c Linux-2.6.12-rc2 |
2612 |
} |
0eeca2830 [PATCH] inotify |
2613 |
|
1da177e4c Linux-2.6.12-rc2 |
2614 2615 2616 2617 2618 |
return error; } /* * Make sure that the actual truncation of the file will occur outside its |
1b1dcc1b5 [PATCH] mutex sub... |
2619 |
* directory's i_mutex. Truncate can take a long time if there is a lot of |
1da177e4c Linux-2.6.12-rc2 |
2620 2621 2622 |
* writeout happening, and we don't want to prevent access to the directory * while waiting on the I/O. */ |
5590ff0d5 [PATCH] vfs: *at ... |
2623 |
static long do_unlinkat(int dfd, const char __user *pathname) |
1da177e4c Linux-2.6.12-rc2 |
2624 |
{ |
2ad94ae65 [PATCH] new (loca... |
2625 2626 |
int error; char *name; |
1da177e4c Linux-2.6.12-rc2 |
2627 2628 2629 |
struct dentry *dentry; struct nameidata nd; struct inode *inode = NULL; |
2ad94ae65 [PATCH] new (loca... |
2630 |
error = user_path_parent(dfd, pathname, &nd, &name); |
1da177e4c Linux-2.6.12-rc2 |
2631 |
if (error) |
2ad94ae65 [PATCH] new (loca... |
2632 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
2633 2634 2635 |
error = -EISDIR; if (nd.last_type != LAST_NORM) goto exit1; |
0612d9fb2 [PATCH vfs-2.6 5/... |
2636 2637 |
nd.flags &= ~LOOKUP_PARENT; |
4ac913785 Embed a struct pa... |
2638 |
mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); |
49705b774 [PATCH] sanitize ... |
2639 |
dentry = lookup_hash(&nd); |
1da177e4c Linux-2.6.12-rc2 |
2640 2641 2642 |
error = PTR_ERR(dentry); if (!IS_ERR(dentry)) { /* Why not before? Because we want correct error value */ |
50338b889 fix wrong iput on... |
2643 2644 |
if (nd.last.name[nd.last.len]) goto slashes; |
1da177e4c Linux-2.6.12-rc2 |
2645 |
inode = dentry->d_inode; |
50338b889 fix wrong iput on... |
2646 |
if (!inode) |
e6bc45d65 vfs: make unlink(... |
2647 2648 |
goto slashes; ihold(inode); |
0622753b8 [PATCH] r/o bind ... |
2649 2650 2651 |
error = mnt_want_write(nd.path.mnt); if (error) goto exit2; |
be6d3e56a introduce new LSM... |
2652 2653 2654 |
error = security_path_unlink(&nd.path, dentry); if (error) goto exit3; |
4ac913785 Embed a struct pa... |
2655 |
error = vfs_unlink(nd.path.dentry->d_inode, dentry); |
be6d3e56a introduce new LSM... |
2656 |
exit3: |
0622753b8 [PATCH] r/o bind ... |
2657 |
mnt_drop_write(nd.path.mnt); |
1da177e4c Linux-2.6.12-rc2 |
2658 2659 2660 |
exit2: dput(dentry); } |
4ac913785 Embed a struct pa... |
2661 |
mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2662 2663 2664 |
if (inode) iput(inode); /* truncate the inode here */ exit1: |
1d957f9bf Introduce path_put() |
2665 |
path_put(&nd.path); |
1da177e4c Linux-2.6.12-rc2 |
2666 2667 2668 2669 2670 2671 2672 2673 |
putname(name); return error; slashes: error = !dentry->d_inode ? -ENOENT : S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR; goto exit2; } |
2e4d0924e [CVE-2009-0029] S... |
2674 |
SYSCALL_DEFINE3(unlinkat, int, dfd, const char __user *, pathname, int, flag) |
5590ff0d5 [PATCH] vfs: *at ... |
2675 2676 2677 2678 2679 2680 2681 2682 2683 |
{ if ((flag & ~AT_REMOVEDIR) != 0) return -EINVAL; if (flag & AT_REMOVEDIR) return do_rmdir(dfd, pathname); return do_unlinkat(dfd, pathname); } |
3480b2574 [CVE-2009-0029] S... |
2684 |
SYSCALL_DEFINE1(unlink, const char __user *, pathname) |
5590ff0d5 [PATCH] vfs: *at ... |
2685 2686 2687 |
{ return do_unlinkat(AT_FDCWD, pathname); } |
db2e747b1 [patch 5/5] vfs: ... |
2688 |
int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname) |
1da177e4c Linux-2.6.12-rc2 |
2689 |
{ |
a95164d97 [patch 3/4] vfs: ... |
2690 |
int error = may_create(dir, dentry); |
1da177e4c Linux-2.6.12-rc2 |
2691 2692 2693 |
if (error) return error; |
acfa4380e inode->i_op is ne... |
2694 |
if (!dir->i_op->symlink) |
1da177e4c Linux-2.6.12-rc2 |
2695 2696 2697 2698 2699 |
return -EPERM; error = security_inode_symlink(dir, dentry, oldname); if (error) return error; |
1da177e4c Linux-2.6.12-rc2 |
2700 |
error = dir->i_op->symlink(dir, dentry, oldname); |
a74574aaf [PATCH] Remove se... |
2701 |
if (!error) |
f38aa9422 [PATCH] Pass dent... |
2702 |
fsnotify_create(dir, dentry); |
1da177e4c Linux-2.6.12-rc2 |
2703 2704 |
return error; } |
2e4d0924e [CVE-2009-0029] S... |
2705 2706 |
SYSCALL_DEFINE3(symlinkat, const char __user *, oldname, int, newdfd, const char __user *, newname) |
1da177e4c Linux-2.6.12-rc2 |
2707 |
{ |
2ad94ae65 [PATCH] new (loca... |
2708 2709 |
int error; char *from; |
6902d925d [PATCH] r/o bind ... |
2710 |
struct dentry *dentry; |
dae6ad8f3 new helpers: kern... |
2711 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
2712 2713 |
from = getname(oldname); |
2ad94ae65 [PATCH] new (loca... |
2714 |
if (IS_ERR(from)) |
1da177e4c Linux-2.6.12-rc2 |
2715 |
return PTR_ERR(from); |
1da177e4c Linux-2.6.12-rc2 |
2716 |
|
dae6ad8f3 new helpers: kern... |
2717 |
dentry = user_path_create(newdfd, newname, &path, 0); |
6902d925d [PATCH] r/o bind ... |
2718 2719 |
error = PTR_ERR(dentry); if (IS_ERR(dentry)) |
dae6ad8f3 new helpers: kern... |
2720 |
goto out_putname; |
6902d925d [PATCH] r/o bind ... |
2721 |
|
dae6ad8f3 new helpers: kern... |
2722 |
error = mnt_want_write(path.mnt); |
75c3f29de [PATCH] r/o bind ... |
2723 2724 |
if (error) goto out_dput; |
dae6ad8f3 new helpers: kern... |
2725 |
error = security_path_symlink(&path, dentry, from); |
be6d3e56a introduce new LSM... |
2726 2727 |
if (error) goto out_drop_write; |
dae6ad8f3 new helpers: kern... |
2728 |
error = vfs_symlink(path.dentry->d_inode, dentry, from); |
be6d3e56a introduce new LSM... |
2729 |
out_drop_write: |
dae6ad8f3 new helpers: kern... |
2730 |
mnt_drop_write(path.mnt); |
75c3f29de [PATCH] r/o bind ... |
2731 |
out_dput: |
6902d925d [PATCH] r/o bind ... |
2732 |
dput(dentry); |
dae6ad8f3 new helpers: kern... |
2733 2734 |
mutex_unlock(&path.dentry->d_inode->i_mutex); path_put(&path); |
6902d925d [PATCH] r/o bind ... |
2735 |
out_putname: |
1da177e4c Linux-2.6.12-rc2 |
2736 2737 2738 |
putname(from); return error; } |
3480b2574 [CVE-2009-0029] S... |
2739 |
SYSCALL_DEFINE2(symlink, const char __user *, oldname, const char __user *, newname) |
5590ff0d5 [PATCH] vfs: *at ... |
2740 2741 2742 |
{ return sys_symlinkat(oldname, AT_FDCWD, newname); } |
1da177e4c Linux-2.6.12-rc2 |
2743 2744 2745 2746 2747 2748 2749 |
int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) { struct inode *inode = old_dentry->d_inode; int error; if (!inode) return -ENOENT; |
a95164d97 [patch 3/4] vfs: ... |
2750 |
error = may_create(dir, new_dentry); |
1da177e4c Linux-2.6.12-rc2 |
2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 |
if (error) return error; if (dir->i_sb != inode->i_sb) return -EXDEV; /* * A link to an append-only or immutable file cannot be created. */ if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) return -EPERM; |
acfa4380e inode->i_op is ne... |
2762 |
if (!dir->i_op->link) |
1da177e4c Linux-2.6.12-rc2 |
2763 |
return -EPERM; |
7e79eedb3 [patch 4/5] vfs: ... |
2764 |
if (S_ISDIR(inode->i_mode)) |
1da177e4c Linux-2.6.12-rc2 |
2765 2766 2767 2768 2769 |
return -EPERM; error = security_inode_link(old_dentry, dir, new_dentry); if (error) return error; |
7e79eedb3 [patch 4/5] vfs: ... |
2770 |
mutex_lock(&inode->i_mutex); |
aae8a97d3 fs: Don't allow t... |
2771 2772 2773 2774 2775 |
/* Make sure we don't allow creating hardlink to an unlinked file */ if (inode->i_nlink == 0) error = -ENOENT; else error = dir->i_op->link(old_dentry, dir, new_dentry); |
7e79eedb3 [patch 4/5] vfs: ... |
2776 |
mutex_unlock(&inode->i_mutex); |
e31e14ec3 [PATCH] remove th... |
2777 |
if (!error) |
7e79eedb3 [patch 4/5] vfs: ... |
2778 |
fsnotify_link(dir, inode, new_dentry); |
1da177e4c Linux-2.6.12-rc2 |
2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 |
return error; } /* * Hardlinks are often used in delicate situations. We avoid * security-related surprises by not following symlinks on the * newname. --KAB * * We don't follow them on the oldname either to be compatible * with linux 2.0, and to avoid hard-linking to directories * and other special files. --ADM */ |
2e4d0924e [CVE-2009-0029] S... |
2791 2792 |
SYSCALL_DEFINE5(linkat, int, olddfd, const char __user *, oldname, int, newdfd, const char __user *, newname, int, flags) |
1da177e4c Linux-2.6.12-rc2 |
2793 2794 |
{ struct dentry *new_dentry; |
dae6ad8f3 new helpers: kern... |
2795 |
struct path old_path, new_path; |
11a7b371b fs: allow AT_EMPT... |
2796 |
int how = 0; |
1da177e4c Linux-2.6.12-rc2 |
2797 |
int error; |
1da177e4c Linux-2.6.12-rc2 |
2798 |
|
11a7b371b fs: allow AT_EMPT... |
2799 |
if ((flags & ~(AT_SYMLINK_FOLLOW | AT_EMPTY_PATH)) != 0) |
c04030e16 [PATCH] flags par... |
2800 |
return -EINVAL; |
11a7b371b fs: allow AT_EMPT... |
2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 |
/* * To use null names we require CAP_DAC_READ_SEARCH * This ensures that not everyone will be able to create * handlink using the passed filedescriptor. */ if (flags & AT_EMPTY_PATH) { if (!capable(CAP_DAC_READ_SEARCH)) return -ENOENT; how = LOOKUP_EMPTY; } if (flags & AT_SYMLINK_FOLLOW) how |= LOOKUP_FOLLOW; |
c04030e16 [PATCH] flags par... |
2814 |
|
11a7b371b fs: allow AT_EMPT... |
2815 |
error = user_path_at(olddfd, oldname, how, &old_path); |
1da177e4c Linux-2.6.12-rc2 |
2816 |
if (error) |
2ad94ae65 [PATCH] new (loca... |
2817 |
return error; |
dae6ad8f3 new helpers: kern... |
2818 |
new_dentry = user_path_create(newdfd, newname, &new_path, 0); |
1da177e4c Linux-2.6.12-rc2 |
2819 |
error = PTR_ERR(new_dentry); |
6902d925d [PATCH] r/o bind ... |
2820 |
if (IS_ERR(new_dentry)) |
dae6ad8f3 new helpers: kern... |
2821 2822 2823 2824 2825 2826 |
goto out; error = -EXDEV; if (old_path.mnt != new_path.mnt) goto out_dput; error = mnt_want_write(new_path.mnt); |
75c3f29de [PATCH] r/o bind ... |
2827 2828 |
if (error) goto out_dput; |
dae6ad8f3 new helpers: kern... |
2829 |
error = security_path_link(old_path.dentry, &new_path, new_dentry); |
be6d3e56a introduce new LSM... |
2830 2831 |
if (error) goto out_drop_write; |
dae6ad8f3 new helpers: kern... |
2832 |
error = vfs_link(old_path.dentry, new_path.dentry->d_inode, new_dentry); |
be6d3e56a introduce new LSM... |
2833 |
out_drop_write: |
dae6ad8f3 new helpers: kern... |
2834 |
mnt_drop_write(new_path.mnt); |
75c3f29de [PATCH] r/o bind ... |
2835 |
out_dput: |
6902d925d [PATCH] r/o bind ... |
2836 |
dput(new_dentry); |
dae6ad8f3 new helpers: kern... |
2837 2838 |
mutex_unlock(&new_path.dentry->d_inode->i_mutex); path_put(&new_path); |
1da177e4c Linux-2.6.12-rc2 |
2839 |
out: |
2d8f30380 [PATCH] sanitize ... |
2840 |
path_put(&old_path); |
1da177e4c Linux-2.6.12-rc2 |
2841 2842 2843 |
return error; } |
3480b2574 [CVE-2009-0029] S... |
2844 |
SYSCALL_DEFINE2(link, const char __user *, oldname, const char __user *, newname) |
5590ff0d5 [PATCH] vfs: *at ... |
2845 |
{ |
c04030e16 [PATCH] flags par... |
2846 |
return sys_linkat(AT_FDCWD, oldname, AT_FDCWD, newname, 0); |
5590ff0d5 [PATCH] vfs: *at ... |
2847 |
} |
1da177e4c Linux-2.6.12-rc2 |
2848 2849 2850 2851 2852 2853 2854 |
/* * The worst of all namespace operations - renaming directory. "Perverted" * doesn't even start to describe it. Somebody in UCB had a heck of a trip... * Problems: * a) we can get into loop creation. Check is done in is_subdir(). * b) race potential - two innocent renames can create a loop together. * That's where 4.4 screws up. Current fix: serialization on |
a11f3a057 [PATCH] sem2mutex... |
2855 |
* sb->s_vfs_rename_mutex. We might be more accurate, but that's another |
1da177e4c Linux-2.6.12-rc2 |
2856 2857 |
* story. * c) we have to lock _three_ objects - parents and victim (if it exists). |
1b1dcc1b5 [PATCH] mutex sub... |
2858 |
* And that - after we got ->i_mutex on parents (until then we don't know |
1da177e4c Linux-2.6.12-rc2 |
2859 2860 |
* whether the target exists). Solution: try to be smart with locking * order for inodes. We rely on the fact that tree topology may change |
a11f3a057 [PATCH] sem2mutex... |
2861 |
* only under ->s_vfs_rename_mutex _and_ that parent of the object we |
1da177e4c Linux-2.6.12-rc2 |
2862 2863 2864 |
* move will be locked. Thus we can rank directories by the tree * (ancestors first) and rank all non-directories after them. * That works since everybody except rename does "lock parent, lookup, |
a11f3a057 [PATCH] sem2mutex... |
2865 |
* lock child" and rename is under ->s_vfs_rename_mutex. |
1da177e4c Linux-2.6.12-rc2 |
2866 2867 2868 |
* HOWEVER, it relies on the assumption that any object with ->lookup() * has no more than 1 dentry. If "hybrid" objects will ever appear, * we'd better make sure that there's no link(2) for them. |
e4eaac06b vfs: push dentry_... |
2869 |
* d) conversion from fhandle to dentry may come in the wrong moment - when |
1b1dcc1b5 [PATCH] mutex sub... |
2870 |
* we are removing the target. Solution: we will have to grab ->i_mutex |
1da177e4c Linux-2.6.12-rc2 |
2871 |
* in the fhandle_to_dentry code. [FIXME - current nfsfh.c relies on |
c41b20e72 Fix misspellings ... |
2872 |
* ->i_mutex on parents, which works but leads to some truly excessive |
1da177e4c Linux-2.6.12-rc2 |
2873 2874 |
* locking]. */ |
75c96f858 [PATCH] make some... |
2875 2876 |
static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) |
1da177e4c Linux-2.6.12-rc2 |
2877 2878 |
{ int error = 0; |
9055cba71 vfs: clean up vfs... |
2879 |
struct inode *target = new_dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
2880 2881 2882 2883 2884 2885 |
/* * If we are going to change the parent - check write permissions, * we'll need to flip '..'. */ if (new_dir != old_dir) { |
f419a2e3b [PATCH] kill name... |
2886 |
error = inode_permission(old_dentry->d_inode, MAY_WRITE); |
1da177e4c Linux-2.6.12-rc2 |
2887 2888 2889 2890 2891 2892 2893 |
if (error) return error; } error = security_inode_rename(old_dir, old_dentry, new_dir, new_dentry); if (error) return error; |
1d2ef5901 restore pinning t... |
2894 |
dget(new_dentry); |
d83c49f3e Fix the regressio... |
2895 |
if (target) |
1b1dcc1b5 [PATCH] mutex sub... |
2896 |
mutex_lock(&target->i_mutex); |
9055cba71 vfs: clean up vfs... |
2897 2898 2899 2900 |
error = -EBUSY; if (d_mountpoint(old_dentry) || d_mountpoint(new_dentry)) goto out; |
3cebde241 vfs: shrink_dcach... |
2901 2902 |
if (target) shrink_dcache_parent(new_dentry); |
9055cba71 vfs: clean up vfs... |
2903 2904 2905 |
error = old_dir->i_op->rename(old_dir, old_dentry, new_dir, new_dentry); if (error) goto out; |
1da177e4c Linux-2.6.12-rc2 |
2906 |
if (target) { |
9055cba71 vfs: clean up vfs... |
2907 2908 |
target->i_flags |= S_DEAD; dont_mount(new_dentry); |
1da177e4c Linux-2.6.12-rc2 |
2909 |
} |
9055cba71 vfs: clean up vfs... |
2910 2911 2912 |
out: if (target) mutex_unlock(&target->i_mutex); |
1d2ef5901 restore pinning t... |
2913 |
dput(new_dentry); |
e31e14ec3 [PATCH] remove th... |
2914 |
if (!error) |
349457ccf [PATCH] Allow fil... |
2915 2916 |
if (!(old_dir->i_sb->s_type->fs_flags & FS_RENAME_DOES_D_MOVE)) d_move(old_dentry,new_dentry); |
1da177e4c Linux-2.6.12-rc2 |
2917 2918 |
return error; } |
75c96f858 [PATCH] make some... |
2919 2920 |
static int vfs_rename_other(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) |
1da177e4c Linux-2.6.12-rc2 |
2921 |
{ |
51892bbb5 vfs: clean up vfs... |
2922 |
struct inode *target = new_dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
2923 2924 2925 2926 2927 2928 2929 |
int error; error = security_inode_rename(old_dir, old_dentry, new_dir, new_dentry); if (error) return error; dget(new_dentry); |
1da177e4c Linux-2.6.12-rc2 |
2930 |
if (target) |
1b1dcc1b5 [PATCH] mutex sub... |
2931 |
mutex_lock(&target->i_mutex); |
51892bbb5 vfs: clean up vfs... |
2932 2933 |
error = -EBUSY; |
1da177e4c Linux-2.6.12-rc2 |
2934 |
if (d_mountpoint(old_dentry)||d_mountpoint(new_dentry)) |
51892bbb5 vfs: clean up vfs... |
2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 |
goto out; error = old_dir->i_op->rename(old_dir, old_dentry, new_dir, new_dentry); if (error) goto out; if (target) dont_mount(new_dentry); if (!(old_dir->i_sb->s_type->fs_flags & FS_RENAME_DOES_D_MOVE)) d_move(old_dentry, new_dentry); out: |
1da177e4c Linux-2.6.12-rc2 |
2946 |
if (target) |
1b1dcc1b5 [PATCH] mutex sub... |
2947 |
mutex_unlock(&target->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2948 2949 2950 2951 2952 2953 2954 2955 2956 |
dput(new_dentry); return error; } int vfs_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) { int error; int is_dir = S_ISDIR(old_dentry->d_inode->i_mode); |
59b0df211 fsnotify: use uns... |
2957 |
const unsigned char *old_name; |
1da177e4c Linux-2.6.12-rc2 |
2958 2959 2960 2961 2962 2963 2964 2965 2966 |
if (old_dentry->d_inode == new_dentry->d_inode) return 0; error = may_delete(old_dir, old_dentry, is_dir); if (error) return error; if (!new_dentry->d_inode) |
a95164d97 [patch 3/4] vfs: ... |
2967 |
error = may_create(new_dir, new_dentry); |
1da177e4c Linux-2.6.12-rc2 |
2968 2969 2970 2971 |
else error = may_delete(new_dir, new_dentry, is_dir); if (error) return error; |
acfa4380e inode->i_op is ne... |
2972 |
if (!old_dir->i_op->rename) |
1da177e4c Linux-2.6.12-rc2 |
2973 |
return -EPERM; |
0eeca2830 [PATCH] inotify |
2974 |
old_name = fsnotify_oldname_init(old_dentry->d_name.name); |
1da177e4c Linux-2.6.12-rc2 |
2975 2976 2977 2978 |
if (is_dir) error = vfs_rename_dir(old_dir,old_dentry,new_dir,new_dentry); else error = vfs_rename_other(old_dir,old_dentry,new_dir,new_dentry); |
123df2944 Lose the new_name... |
2979 2980 |
if (!error) fsnotify_move(old_dir, new_dir, old_name, is_dir, |
5a190ae69 [PATCH] pass dent... |
2981 |
new_dentry->d_inode, old_dentry); |
0eeca2830 [PATCH] inotify |
2982 |
fsnotify_oldname_free(old_name); |
1da177e4c Linux-2.6.12-rc2 |
2983 2984 |
return error; } |
2e4d0924e [CVE-2009-0029] S... |
2985 2986 |
SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname, int, newdfd, const char __user *, newname) |
1da177e4c Linux-2.6.12-rc2 |
2987 |
{ |
2ad94ae65 [PATCH] new (loca... |
2988 2989 2990 |
struct dentry *old_dir, *new_dir; struct dentry *old_dentry, *new_dentry; struct dentry *trap; |
1da177e4c Linux-2.6.12-rc2 |
2991 |
struct nameidata oldnd, newnd; |
2ad94ae65 [PATCH] new (loca... |
2992 2993 2994 |
char *from; char *to; int error; |
1da177e4c Linux-2.6.12-rc2 |
2995 |
|
2ad94ae65 [PATCH] new (loca... |
2996 |
error = user_path_parent(olddfd, oldname, &oldnd, &from); |
1da177e4c Linux-2.6.12-rc2 |
2997 2998 |
if (error) goto exit; |
2ad94ae65 [PATCH] new (loca... |
2999 |
error = user_path_parent(newdfd, newname, &newnd, &to); |
1da177e4c Linux-2.6.12-rc2 |
3000 3001 3002 3003 |
if (error) goto exit1; error = -EXDEV; |
4ac913785 Embed a struct pa... |
3004 |
if (oldnd.path.mnt != newnd.path.mnt) |
1da177e4c Linux-2.6.12-rc2 |
3005 |
goto exit2; |
4ac913785 Embed a struct pa... |
3006 |
old_dir = oldnd.path.dentry; |
1da177e4c Linux-2.6.12-rc2 |
3007 3008 3009 |
error = -EBUSY; if (oldnd.last_type != LAST_NORM) goto exit2; |
4ac913785 Embed a struct pa... |
3010 |
new_dir = newnd.path.dentry; |
1da177e4c Linux-2.6.12-rc2 |
3011 3012 |
if (newnd.last_type != LAST_NORM) goto exit2; |
0612d9fb2 [PATCH vfs-2.6 5/... |
3013 3014 |
oldnd.flags &= ~LOOKUP_PARENT; newnd.flags &= ~LOOKUP_PARENT; |
4e9ed2f85 [PATCH vfs-2.6 6/... |
3015 |
newnd.flags |= LOOKUP_RENAME_TARGET; |
0612d9fb2 [PATCH vfs-2.6 5/... |
3016 |
|
1da177e4c Linux-2.6.12-rc2 |
3017 |
trap = lock_rename(new_dir, old_dir); |
49705b774 [PATCH] sanitize ... |
3018 |
old_dentry = lookup_hash(&oldnd); |
1da177e4c Linux-2.6.12-rc2 |
3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 |
error = PTR_ERR(old_dentry); if (IS_ERR(old_dentry)) goto exit3; /* source must exist */ error = -ENOENT; if (!old_dentry->d_inode) goto exit4; /* unless the source is a directory trailing slashes give -ENOTDIR */ if (!S_ISDIR(old_dentry->d_inode->i_mode)) { error = -ENOTDIR; if (oldnd.last.name[oldnd.last.len]) goto exit4; if (newnd.last.name[newnd.last.len]) goto exit4; } /* source should not be ancestor of target */ error = -EINVAL; if (old_dentry == trap) goto exit4; |
49705b774 [PATCH] sanitize ... |
3038 |
new_dentry = lookup_hash(&newnd); |
1da177e4c Linux-2.6.12-rc2 |
3039 3040 3041 3042 3043 3044 3045 |
error = PTR_ERR(new_dentry); if (IS_ERR(new_dentry)) goto exit4; /* target should not be an ancestor of source */ error = -ENOTEMPTY; if (new_dentry == trap) goto exit5; |
9079b1eb1 [PATCH] r/o bind ... |
3046 3047 3048 |
error = mnt_want_write(oldnd.path.mnt); if (error) goto exit5; |
be6d3e56a introduce new LSM... |
3049 3050 3051 3052 |
error = security_path_rename(&oldnd.path, old_dentry, &newnd.path, new_dentry); if (error) goto exit6; |
1da177e4c Linux-2.6.12-rc2 |
3053 3054 |
error = vfs_rename(old_dir->d_inode, old_dentry, new_dir->d_inode, new_dentry); |
be6d3e56a introduce new LSM... |
3055 |
exit6: |
9079b1eb1 [PATCH] r/o bind ... |
3056 |
mnt_drop_write(oldnd.path.mnt); |
1da177e4c Linux-2.6.12-rc2 |
3057 3058 3059 3060 3061 3062 3063 |
exit5: dput(new_dentry); exit4: dput(old_dentry); exit3: unlock_rename(new_dir, old_dir); exit2: |
1d957f9bf Introduce path_put() |
3064 |
path_put(&newnd.path); |
2ad94ae65 [PATCH] new (loca... |
3065 |
putname(to); |
1da177e4c Linux-2.6.12-rc2 |
3066 |
exit1: |
1d957f9bf Introduce path_put() |
3067 |
path_put(&oldnd.path); |
1da177e4c Linux-2.6.12-rc2 |
3068 |
putname(from); |
2ad94ae65 [PATCH] new (loca... |
3069 |
exit: |
1da177e4c Linux-2.6.12-rc2 |
3070 3071 |
return error; } |
a26eab240 [CVE-2009-0029] S... |
3072 |
SYSCALL_DEFINE2(rename, const char __user *, oldname, const char __user *, newname) |
5590ff0d5 [PATCH] vfs: *at ... |
3073 3074 3075 |
{ return sys_renameat(AT_FDCWD, oldname, AT_FDCWD, newname); } |
1da177e4c Linux-2.6.12-rc2 |
3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 |
int vfs_readlink(struct dentry *dentry, char __user *buffer, int buflen, const char *link) { int len; len = PTR_ERR(link); if (IS_ERR(link)) goto out; len = strlen(link); if (len > (unsigned) buflen) len = buflen; if (copy_to_user(buffer, link, len)) len = -EFAULT; out: return len; } /* * A helper for ->readlink(). This should be used *ONLY* for symlinks that * have ->follow_link() touching nd only in nd_set_link(). Using (or not * using) it for any given inode is up to filesystem. */ int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen) { struct nameidata nd; |
cc314eef0 Fix nasty ncpfs s... |
3101 |
void *cookie; |
694a1764d [patch 3/4] vfs: ... |
3102 |
int res; |
cc314eef0 Fix nasty ncpfs s... |
3103 |
|
1da177e4c Linux-2.6.12-rc2 |
3104 |
nd.depth = 0; |
cc314eef0 Fix nasty ncpfs s... |
3105 |
cookie = dentry->d_inode->i_op->follow_link(dentry, &nd); |
694a1764d [patch 3/4] vfs: ... |
3106 3107 3108 3109 3110 3111 3112 |
if (IS_ERR(cookie)) return PTR_ERR(cookie); res = vfs_readlink(dentry, buffer, buflen, nd_get_link(&nd)); if (dentry->d_inode->i_op->put_link) dentry->d_inode->i_op->put_link(dentry, &nd, cookie); return res; |
1da177e4c Linux-2.6.12-rc2 |
3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 |
} int vfs_follow_link(struct nameidata *nd, const char *link) { return __vfs_follow_link(nd, link); } /* get the link contents into pagecache */ static char *page_getlink(struct dentry * dentry, struct page **ppage) { |
ebd09abbd vfs: ensure page ... |
3123 3124 |
char *kaddr; struct page *page; |
1da177e4c Linux-2.6.12-rc2 |
3125 |
struct address_space *mapping = dentry->d_inode->i_mapping; |
090d2b185 [PATCH] read_mapp... |
3126 |
page = read_mapping_page(mapping, 0, NULL); |
1da177e4c Linux-2.6.12-rc2 |
3127 |
if (IS_ERR(page)) |
6fe6900e1 mm: make read_cac... |
3128 |
return (char*)page; |
1da177e4c Linux-2.6.12-rc2 |
3129 |
*ppage = page; |
ebd09abbd vfs: ensure page ... |
3130 3131 3132 |
kaddr = kmap(page); nd_terminate_link(kaddr, dentry->d_inode->i_size, PAGE_SIZE - 1); return kaddr; |
1da177e4c Linux-2.6.12-rc2 |
3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 |
} int page_readlink(struct dentry *dentry, char __user *buffer, int buflen) { struct page *page = NULL; char *s = page_getlink(dentry, &page); int res = vfs_readlink(dentry,buffer,buflen,s); if (page) { kunmap(page); page_cache_release(page); } return res; } |
cc314eef0 Fix nasty ncpfs s... |
3146 |
void *page_follow_link_light(struct dentry *dentry, struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
3147 |
{ |
cc314eef0 Fix nasty ncpfs s... |
3148 |
struct page *page = NULL; |
1da177e4c Linux-2.6.12-rc2 |
3149 |
nd_set_link(nd, page_getlink(dentry, &page)); |
cc314eef0 Fix nasty ncpfs s... |
3150 |
return page; |
1da177e4c Linux-2.6.12-rc2 |
3151 |
} |
cc314eef0 Fix nasty ncpfs s... |
3152 |
void page_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie) |
1da177e4c Linux-2.6.12-rc2 |
3153 |
{ |
cc314eef0 Fix nasty ncpfs s... |
3154 3155 3156 |
struct page *page = cookie; if (page) { |
1da177e4c Linux-2.6.12-rc2 |
3157 3158 |
kunmap(page); page_cache_release(page); |
1da177e4c Linux-2.6.12-rc2 |
3159 3160 |
} } |
54566b2c1 fs: symlink write... |
3161 3162 3163 3164 |
/* * The nofs argument instructs pagecache_write_begin to pass AOP_FLAG_NOFS */ int __page_symlink(struct inode *inode, const char *symname, int len, int nofs) |
1da177e4c Linux-2.6.12-rc2 |
3165 3166 |
{ struct address_space *mapping = inode->i_mapping; |
0adb25d2e [PATCH] ext3: ext... |
3167 |
struct page *page; |
afddba49d fs: introduce wri... |
3168 |
void *fsdata; |
beb497ab4 [PATCH] __page_sy... |
3169 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
3170 |
char *kaddr; |
54566b2c1 fs: symlink write... |
3171 3172 3173 |
unsigned int flags = AOP_FLAG_UNINTERRUPTIBLE; if (nofs) flags |= AOP_FLAG_NOFS; |
1da177e4c Linux-2.6.12-rc2 |
3174 |
|
7e53cac41 [PATCH] Honour AO... |
3175 |
retry: |
afddba49d fs: introduce wri... |
3176 |
err = pagecache_write_begin(NULL, mapping, 0, len-1, |
54566b2c1 fs: symlink write... |
3177 |
flags, &page, &fsdata); |
1da177e4c Linux-2.6.12-rc2 |
3178 |
if (err) |
afddba49d fs: introduce wri... |
3179 |
goto fail; |
1da177e4c Linux-2.6.12-rc2 |
3180 3181 3182 |
kaddr = kmap_atomic(page, KM_USER0); memcpy(kaddr, symname, len-1); kunmap_atomic(kaddr, KM_USER0); |
afddba49d fs: introduce wri... |
3183 3184 3185 |
err = pagecache_write_end(NULL, mapping, 0, len-1, len-1, page, fsdata); |
1da177e4c Linux-2.6.12-rc2 |
3186 3187 |
if (err < 0) goto fail; |
afddba49d fs: introduce wri... |
3188 3189 |
if (err < len-1) goto retry; |
1da177e4c Linux-2.6.12-rc2 |
3190 3191 |
mark_inode_dirty(inode); return 0; |
1da177e4c Linux-2.6.12-rc2 |
3192 3193 3194 |
fail: return err; } |
0adb25d2e [PATCH] ext3: ext... |
3195 3196 3197 |
int page_symlink(struct inode *inode, const char *symname, int len) { return __page_symlink(inode, symname, len, |
54566b2c1 fs: symlink write... |
3198 |
!(mapping_gfp_mask(inode->i_mapping) & __GFP_FS)); |
0adb25d2e [PATCH] ext3: ext... |
3199 |
} |
92e1d5be9 [PATCH] mark stru... |
3200 |
const struct inode_operations page_symlink_inode_operations = { |
1da177e4c Linux-2.6.12-rc2 |
3201 3202 3203 3204 |
.readlink = generic_readlink, .follow_link = page_follow_link_light, .put_link = page_put_link, }; |
2d8f30380 [PATCH] sanitize ... |
3205 |
EXPORT_SYMBOL(user_path_at); |
cc53ce53c Add a dentry op t... |
3206 |
EXPORT_SYMBOL(follow_down_one); |
1da177e4c Linux-2.6.12-rc2 |
3207 3208 3209 3210 3211 |
EXPORT_SYMBOL(follow_down); EXPORT_SYMBOL(follow_up); EXPORT_SYMBOL(get_write_access); /* binfmt_aout */ EXPORT_SYMBOL(getname); EXPORT_SYMBOL(lock_rename); |
1da177e4c Linux-2.6.12-rc2 |
3212 3213 3214 3215 |
EXPORT_SYMBOL(lookup_one_len); EXPORT_SYMBOL(page_follow_link_light); EXPORT_SYMBOL(page_put_link); EXPORT_SYMBOL(page_readlink); |
0adb25d2e [PATCH] ext3: ext... |
3216 |
EXPORT_SYMBOL(__page_symlink); |
1da177e4c Linux-2.6.12-rc2 |
3217 3218 |
EXPORT_SYMBOL(page_symlink); EXPORT_SYMBOL(page_symlink_inode_operations); |
d18114657 [PATCH] new helpe... |
3219 |
EXPORT_SYMBOL(kern_path); |
16f182002 fs: introduce vfs... |
3220 |
EXPORT_SYMBOL(vfs_path_lookup); |
f419a2e3b [PATCH] kill name... |
3221 |
EXPORT_SYMBOL(inode_permission); |
1da177e4c Linux-2.6.12-rc2 |
3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 |
EXPORT_SYMBOL(unlock_rename); EXPORT_SYMBOL(vfs_create); EXPORT_SYMBOL(vfs_follow_link); EXPORT_SYMBOL(vfs_link); EXPORT_SYMBOL(vfs_mkdir); EXPORT_SYMBOL(vfs_mknod); EXPORT_SYMBOL(generic_permission); EXPORT_SYMBOL(vfs_readlink); EXPORT_SYMBOL(vfs_rename); EXPORT_SYMBOL(vfs_rmdir); EXPORT_SYMBOL(vfs_symlink); EXPORT_SYMBOL(vfs_unlink); EXPORT_SYMBOL(dentry_unhash); EXPORT_SYMBOL(generic_readlink); |