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fs/namei.c
73 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> #include <linux/quotaops.h> #include <linux/pagemap.h> |
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#include <linux/fsnotify.h> |
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#include <linux/personality.h> #include <linux/security.h> #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 <asm/namei.h> #include <asm/uaccess.h> #define ACC_MODE(x) ("\000\004\002\006"[(x)&O_ACCMODE]) /* [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 * the name is a symlink pointing to a non-existant name. * * 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... */ |
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static int __link_path_walk(const char *name, struct nameidata *nd); |
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/* 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; } char * getname(const char __user * filename) { char *tmp, *result; result = ERR_PTR(-ENOMEM); tmp = __getname(); if (tmp) { int retval = do_getname(filename, tmp); result = tmp; if (retval < 0) { __putname(tmp); result = ERR_PTR(retval); } } audit_getname(result); return result; } #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 /** * generic_permission - check for access rights on a Posix-like filesystem * @inode: inode to check access rights for * @mask: right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC) * @check_acl: optional callback to check for Posix ACLs * * 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 * are used for other things.. */ int generic_permission(struct inode *inode, int mask, int (*check_acl)(struct inode *inode, int mask)) { umode_t mode = inode->i_mode; if (current->fsuid == inode->i_uid) mode >>= 6; else { if (IS_POSIXACL(inode) && (mode & S_IRWXG) && check_acl) { int error = check_acl(inode, mask); if (error == -EACCES) goto check_capabilities; else if (error != -EAGAIN) return error; } if (in_group_p(inode->i_gid)) mode >>= 3; } /* * If the DACs are ok we don't need any capability check. */ if (((mode & mask & (MAY_READ|MAY_WRITE|MAY_EXEC)) == mask)) return 0; check_capabilities: /* * Read/write DACs are always overridable. * Executable DACs are overridable if at least one exec bit is set. */ if (!(mask & MAY_EXEC) || (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode)) if (capable(CAP_DAC_OVERRIDE)) return 0; /* * Searching includes executable on directories, else just read. */ if (mask == MAY_READ || (S_ISDIR(inode->i_mode) && !(mask & MAY_WRITE))) if (capable(CAP_DAC_READ_SEARCH)) return 0; return -EACCES; } int permission(struct inode *inode, int mask, struct nameidata *nd) { int retval, submask; |
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struct vfsmount *mnt = NULL; if (nd) |
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mnt = nd->path.mnt; |
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if (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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if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { /* * MAY_EXEC on regular files is denied if the fs is mounted * with the "noexec" flag. */ |
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if (mnt && (mnt->mnt_flags & MNT_NOEXEC)) |
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return -EACCES; } |
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|
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/* Ordinary permission routines do not understand MAY_APPEND. */ submask = mask & ~MAY_APPEND; |
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if (inode->i_op && inode->i_op->permission) { |
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retval = inode->i_op->permission(inode, submask, nd); |
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if (!retval) { /* * Exec permission on a regular file is denied if none * of the execute bits are set. * * This check should be done by the ->permission() * method. */ if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode) && !(inode->i_mode & S_IXUGO)) return -EACCES; } } else { |
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retval = generic_permission(inode, submask, NULL); |
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} |
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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, nd); } |
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/** * vfs_permission - check for access rights to a given path * @nd: lookup result that describes the path * @mask: right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC) * * Used to check for read/write/execute permissions on a path. * We use "fsuid" for this, letting us set arbitrary permissions * for filesystem access without changing the "normal" uids which * are used for other things. */ int vfs_permission(struct nameidata *nd, int mask) { |
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return permission(nd->path.dentry->d_inode, mask, nd); |
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} |
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/** * file_permission - check for additional access rights to a given file * @file: file to check access rights for * @mask: right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC) * * Used to check for read/write/execute permissions on an already opened * file. * * Note: * Do not use this function in new code. All access checks should * be done using vfs_permission(). */ int file_permission(struct file *file, int mask) { |
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return permission(file->f_path.dentry->d_inode, mask, NULL); |
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} |
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/* * get_write_access() gets write permission for a file. * put_write_access() releases this write permission. * This is used for regular files. * We cannot support write (and maybe mmap read-write shared) accesses and * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode * can have the following values: * 0: no writers, no VM_DENYWRITE mappings * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist * > 0: (i_writecount) users are writing to the file. * * Normally we operate on that counter with atomic_{inc,dec} and it's safe * except for the cases where we don't hold i_writecount yet. Then we need to * use {get,deny}_write_access() - these functions check the sign and refuse * to do the change if sign is wrong. Exclusion between them is provided by * the inode->i_lock spinlock. */ int get_write_access(struct inode * inode) { spin_lock(&inode->i_lock); if (atomic_read(&inode->i_writecount) < 0) { spin_unlock(&inode->i_lock); return -ETXTBSY; } atomic_inc(&inode->i_writecount); spin_unlock(&inode->i_lock); return 0; } int deny_write_access(struct file * file) { |
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struct inode *inode = file->f_path.dentry->d_inode; |
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spin_lock(&inode->i_lock); if (atomic_read(&inode->i_writecount) > 0) { spin_unlock(&inode->i_lock); return -ETXTBSY; } atomic_dec(&inode->i_writecount); spin_unlock(&inode->i_lock); return 0; } |
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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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/** * release_open_intent - free up open intent resources * @nd: pointer to nameidata */ void release_open_intent(struct nameidata *nd) { |
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if (nd->intent.open.file->f_path.dentry == NULL) |
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put_filp(nd->intent.open.file); else fput(nd->intent.open.file); } |
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static inline struct dentry * do_revalidate(struct dentry *dentry, struct nameidata *nd) { int status = dentry->d_op->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) { if (!d_invalidate(dentry)) { dput(dentry); dentry = NULL; } } else { dput(dentry); dentry = ERR_PTR(status); } } return dentry; } |
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/* * Internal lookup() using the new generic dcache. * SMP-safe */ static struct dentry * cached_lookup(struct dentry * parent, struct qstr * name, struct nameidata *nd) { struct dentry * dentry = __d_lookup(parent, name); /* lockess __d_lookup may fail due to concurrent d_move() * in some unrelated directory, so try with d_lookup */ if (!dentry) dentry = d_lookup(parent, name); |
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if (dentry && dentry->d_op && dentry->d_op->d_revalidate) dentry = do_revalidate(dentry, nd); |
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return dentry; } /* * Short-cut version of permission(), for calling by * path_walk(), when dcache lock is held. Combines parts * of permission() and generic_permission(), and tests ONLY for * MAY_EXEC permission. * * If appropriate, check DAC only. If not appropriate, or * short-cut DAC fails, then call permission() to do more * complete permission check. */ |
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static int exec_permission_lite(struct inode *inode, |
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struct nameidata *nd) { umode_t mode = inode->i_mode; if (inode->i_op && inode->i_op->permission) return -EAGAIN; if (current->fsuid == inode->i_uid) mode >>= 6; else if (in_group_p(inode->i_gid)) mode >>= 3; if (mode & MAY_EXEC) goto ok; if ((inode->i_mode & S_IXUGO) && capable(CAP_DAC_OVERRIDE)) goto ok; if (S_ISDIR(inode->i_mode) && capable(CAP_DAC_OVERRIDE)) goto ok; if (S_ISDIR(inode->i_mode) && capable(CAP_DAC_READ_SEARCH)) goto ok; return -EACCES; ok: return security_inode_permission(inode, MAY_EXEC, nd); } /* * This is called when everything else fails, and we actually have * to go to the low-level filesystem to find out what we should do.. * * We get the directory semaphore, and after getting that we also * make sure that nobody added the entry to the dcache in the meantime.. * SMP-safe */ static struct dentry * real_lookup(struct dentry * parent, struct qstr * name, struct nameidata *nd) { struct dentry * result; struct inode *dir = parent->d_inode; |
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mutex_lock(&dir->i_mutex); |
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/* * First re-do the cached lookup just in case it was created * while we waited for the directory semaphore.. * * FIXME! This could use version numbering or similar to * avoid unnecessary cache lookups. * * The "dcache_lock" is purely to protect the RCU list walker * from concurrent renames at this point (we mustn't get false * negatives from the RCU list walk here, unlike the optimistic * fast walk). * * so doing d_lookup() (with seqlock), instead of lockfree __d_lookup */ result = d_lookup(parent, name); if (!result) { struct dentry * dentry = d_alloc(parent, name); result = ERR_PTR(-ENOMEM); if (dentry) { result = dir->i_op->lookup(dir, dentry, nd); if (result) dput(dentry); else result = dentry; } |
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mutex_unlock(&dir->i_mutex); |
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return result; } /* * Uhhuh! Nasty case: the cache was re-populated while * we waited on the semaphore. Need to revalidate. */ |
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mutex_unlock(&dir->i_mutex); |
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if (result->d_op && result->d_op->d_revalidate) { |
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result = do_revalidate(result, nd); if (!result) |
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result = ERR_PTR(-ENOENT); |
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} return result; } static int __emul_lookup_dentry(const char *, struct nameidata *); /* SMP-safe */ |
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static __always_inline int |
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walk_init_root(const char *name, struct nameidata *nd) { |
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struct fs_struct *fs = current->fs; read_lock(&fs->lock); |
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if (fs->altroot.dentry && !(nd->flags & LOOKUP_NOALT)) { nd->path = fs->altroot; path_get(&fs->altroot); |
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read_unlock(&fs->lock); |
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if (__emul_lookup_dentry(name,nd)) return 0; |
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read_lock(&fs->lock); |
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} |
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nd->path = fs->root; path_get(&fs->root); |
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read_unlock(&fs->lock); |
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return 1; } |
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/* * Wrapper to retry pathname resolution whenever the underlying * file system returns an ESTALE. * * Retry the whole path once, forcing real lookup requests * instead of relying on the dcache. */ static __always_inline int link_path_walk(const char *name, struct nameidata *nd) { struct path save = nd->path; int result; /* make sure the stuff we saved doesn't go away */ dget(save.dentry); mntget(save.mnt); result = __link_path_walk(name, nd); if (result == -ESTALE) { /* nd->path had been dropped */ nd->path = save; dget(nd->path.dentry); mntget(nd->path.mnt); nd->flags |= LOOKUP_REVAL; result = __link_path_walk(name, nd); } path_put(&save); return result; } |
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static __always_inline int __vfs_follow_link(struct nameidata *nd, const char *link) |
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{ int res = 0; char *name; if (IS_ERR(link)) goto fail; if (*link == '/') { |
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path_put(&nd->path); |
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if (!walk_init_root(link, nd)) /* weird __emul_prefix() stuff did it */ goto out; } res = link_path_walk(link, nd); out: if (nd->depth || res || nd->last_type!=LAST_NORM) return res; /* * If it is an iterative symlinks resolution in open_namei() we * have to copy the last component. And all that crap because of * bloody create() on broken symlinks. Furrfu... */ name = __getname(); if (unlikely(!name)) { |
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path_put(&nd->path); |
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return -ENOMEM; } strcpy(name, nd->last.name); nd->last.name = name; return 0; fail: |
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path_put(&nd->path); |
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return PTR_ERR(link); } |
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static void path_put_conditional(struct path *path, struct nameidata *nd) |
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{ dput(path->dentry); |
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if (path->mnt != nd->path.mnt) |
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mntput(path->mnt); } static inline void path_to_nameidata(struct path *path, struct nameidata *nd) { |
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dput(nd->path.dentry); if (nd->path.mnt != path->mnt) mntput(nd->path.mnt); nd->path.mnt = path->mnt; nd->path.dentry = path->dentry; |
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} |
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static __always_inline int __do_follow_link(struct path *path, struct nameidata *nd) |
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{ int error; |
cc314eef0 Fix nasty ncpfs s... |
639 |
void *cookie; |
cd4e91d3b [PATCH] namei fix... |
640 |
struct dentry *dentry = path->dentry; |
1da177e4c Linux-2.6.12-rc2 |
641 |
|
d671a1cbf [PATCH] namei fix... |
642 |
touch_atime(path->mnt, dentry); |
1da177e4c Linux-2.6.12-rc2 |
643 |
nd_set_link(nd, NULL); |
cd4e91d3b [PATCH] namei fix... |
644 |
|
4ac913785 Embed a struct pa... |
645 |
if (path->mnt != nd->path.mnt) { |
051d38125 [PATCH] autofs4: ... |
646 647 648 649 |
path_to_nameidata(path, nd); dget(dentry); } mntget(path->mnt); |
cc314eef0 Fix nasty ncpfs s... |
650 651 652 |
cookie = dentry->d_inode->i_op->follow_link(dentry, nd); error = PTR_ERR(cookie); if (!IS_ERR(cookie)) { |
1da177e4c Linux-2.6.12-rc2 |
653 |
char *s = nd_get_link(nd); |
cc314eef0 Fix nasty ncpfs s... |
654 |
error = 0; |
1da177e4c Linux-2.6.12-rc2 |
655 656 657 |
if (s) error = __vfs_follow_link(nd, s); if (dentry->d_inode->i_op->put_link) |
cc314eef0 Fix nasty ncpfs s... |
658 |
dentry->d_inode->i_op->put_link(dentry, nd, cookie); |
1da177e4c Linux-2.6.12-rc2 |
659 |
} |
09da5916b Use path_put() in... |
660 |
path_put(path); |
1da177e4c Linux-2.6.12-rc2 |
661 662 663 664 665 666 667 668 669 670 671 |
return error; } /* * 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. */ |
90ebe5654 [PATCH] namei fixes |
672 |
static inline int do_follow_link(struct path *path, struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
673 674 675 676 677 678 679 680 |
{ int err = -ELOOP; if (current->link_count >= MAX_NESTED_LINKS) goto loop; if (current->total_link_count >= 40) goto loop; BUG_ON(nd->depth >= MAX_NESTED_LINKS); cond_resched(); |
90ebe5654 [PATCH] namei fixes |
681 |
err = security_inode_follow_link(path->dentry, nd); |
1da177e4c Linux-2.6.12-rc2 |
682 683 684 685 686 |
if (err) goto loop; current->link_count++; current->total_link_count++; nd->depth++; |
cd4e91d3b [PATCH] namei fix... |
687 |
err = __do_follow_link(path, nd); |
839d9f93c [PATCH] namei fix... |
688 689 |
current->link_count--; nd->depth--; |
1da177e4c Linux-2.6.12-rc2 |
690 691 |
return err; loop: |
1d957f9bf Introduce path_put() |
692 693 |
path_put_conditional(path, nd); path_put(&nd->path); |
1da177e4c Linux-2.6.12-rc2 |
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 |
return err; } int follow_up(struct vfsmount **mnt, struct dentry **dentry) { struct vfsmount *parent; struct dentry *mountpoint; spin_lock(&vfsmount_lock); parent=(*mnt)->mnt_parent; if (parent == *mnt) { spin_unlock(&vfsmount_lock); return 0; } mntget(parent); mountpoint=dget((*mnt)->mnt_mountpoint); spin_unlock(&vfsmount_lock); dput(*dentry); *dentry = mountpoint; mntput(*mnt); *mnt = parent; return 1; } /* no need for dcache_lock, as serialization is taken care in * namespace.c */ |
463ffb2e9 [PATCH] namei fix... |
720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 |
static int __follow_mount(struct path *path) { int res = 0; while (d_mountpoint(path->dentry)) { struct vfsmount *mounted = lookup_mnt(path->mnt, path->dentry); if (!mounted) break; dput(path->dentry); if (res) mntput(path->mnt); path->mnt = mounted; path->dentry = dget(mounted->mnt_root); res = 1; } return res; } |
58c465eba [PATCH] namei fix... |
736 |
static void follow_mount(struct vfsmount **mnt, struct dentry **dentry) |
1da177e4c Linux-2.6.12-rc2 |
737 |
{ |
1da177e4c Linux-2.6.12-rc2 |
738 739 740 741 |
while (d_mountpoint(*dentry)) { struct vfsmount *mounted = lookup_mnt(*mnt, *dentry); if (!mounted) break; |
58c465eba [PATCH] namei fix... |
742 |
dput(*dentry); |
1da177e4c Linux-2.6.12-rc2 |
743 744 |
mntput(*mnt); *mnt = mounted; |
1da177e4c Linux-2.6.12-rc2 |
745 |
*dentry = dget(mounted->mnt_root); |
1da177e4c Linux-2.6.12-rc2 |
746 |
} |
1da177e4c Linux-2.6.12-rc2 |
747 748 749 750 751 |
} /* no need for dcache_lock, as serialization is taken care in * namespace.c */ |
e13b210f6 [PATCH] namei fix... |
752 |
int follow_down(struct vfsmount **mnt, struct dentry **dentry) |
1da177e4c Linux-2.6.12-rc2 |
753 754 755 756 757 |
{ struct vfsmount *mounted; mounted = lookup_mnt(*mnt, *dentry); if (mounted) { |
e13b210f6 [PATCH] namei fix... |
758 |
dput(*dentry); |
1da177e4c Linux-2.6.12-rc2 |
759 760 |
mntput(*mnt); *mnt = mounted; |
1da177e4c Linux-2.6.12-rc2 |
761 762 763 764 765 |
*dentry = dget(mounted->mnt_root); return 1; } return 0; } |
f16623569 [PATCH] Mark some... |
766 |
static __always_inline void follow_dotdot(struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
767 |
{ |
e518ddb7b [PATCH] fs/namei.... |
768 |
struct fs_struct *fs = current->fs; |
1da177e4c Linux-2.6.12-rc2 |
769 770 |
while(1) { struct vfsmount *parent; |
4ac913785 Embed a struct pa... |
771 |
struct dentry *old = nd->path.dentry; |
1da177e4c Linux-2.6.12-rc2 |
772 |
|
e518ddb7b [PATCH] fs/namei.... |
773 |
read_lock(&fs->lock); |
6ac08c39a Use struct path i... |
774 775 |
if (nd->path.dentry == fs->root.dentry && nd->path.mnt == fs->root.mnt) { |
e518ddb7b [PATCH] fs/namei.... |
776 |
read_unlock(&fs->lock); |
1da177e4c Linux-2.6.12-rc2 |
777 778 |
break; } |
e518ddb7b [PATCH] fs/namei.... |
779 |
read_unlock(&fs->lock); |
1da177e4c Linux-2.6.12-rc2 |
780 |
spin_lock(&dcache_lock); |
4ac913785 Embed a struct pa... |
781 782 |
if (nd->path.dentry != nd->path.mnt->mnt_root) { nd->path.dentry = dget(nd->path.dentry->d_parent); |
1da177e4c Linux-2.6.12-rc2 |
783 784 785 786 787 788 |
spin_unlock(&dcache_lock); dput(old); break; } spin_unlock(&dcache_lock); spin_lock(&vfsmount_lock); |
4ac913785 Embed a struct pa... |
789 790 |
parent = nd->path.mnt->mnt_parent; if (parent == nd->path.mnt) { |
1da177e4c Linux-2.6.12-rc2 |
791 792 793 794 |
spin_unlock(&vfsmount_lock); break; } mntget(parent); |
4ac913785 Embed a struct pa... |
795 |
nd->path.dentry = dget(nd->path.mnt->mnt_mountpoint); |
1da177e4c Linux-2.6.12-rc2 |
796 797 |
spin_unlock(&vfsmount_lock); dput(old); |
4ac913785 Embed a struct pa... |
798 799 |
mntput(nd->path.mnt); nd->path.mnt = parent; |
1da177e4c Linux-2.6.12-rc2 |
800 |
} |
4ac913785 Embed a struct pa... |
801 |
follow_mount(&nd->path.mnt, &nd->path.dentry); |
1da177e4c Linux-2.6.12-rc2 |
802 |
} |
1da177e4c Linux-2.6.12-rc2 |
803 804 805 806 807 808 809 810 |
/* * 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, struct path *path) { |
4ac913785 Embed a struct pa... |
811 812 |
struct vfsmount *mnt = nd->path.mnt; struct dentry *dentry = __d_lookup(nd->path.dentry, name); |
1da177e4c Linux-2.6.12-rc2 |
813 814 815 816 817 818 819 820 |
if (!dentry) goto need_lookup; if (dentry->d_op && dentry->d_op->d_revalidate) goto need_revalidate; done: path->mnt = mnt; path->dentry = dentry; |
634ee7017 [PATCH] namei fix... |
821 |
__follow_mount(path); |
1da177e4c Linux-2.6.12-rc2 |
822 823 824 |
return 0; need_lookup: |
4ac913785 Embed a struct pa... |
825 |
dentry = real_lookup(nd->path.dentry, name, nd); |
1da177e4c Linux-2.6.12-rc2 |
826 827 828 829 830 |
if (IS_ERR(dentry)) goto fail; goto done; need_revalidate: |
bcdc5e019 [PATCH] autofs4 n... |
831 832 833 834 835 836 |
dentry = do_revalidate(dentry, nd); if (!dentry) goto need_lookup; if (IS_ERR(dentry)) goto fail; goto done; |
1da177e4c Linux-2.6.12-rc2 |
837 838 839 840 841 842 843 |
fail: return PTR_ERR(dentry); } /* * Name resolution. |
ea3834d9f namei: add audit_... |
844 845 |
* 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 |
846 |
* |
ea3834d9f namei: add audit_... |
847 848 |
* 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 |
849 |
*/ |
fc9b52cd8 fs: remove fastca... |
850 |
static int __link_path_walk(const char *name, struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
851 852 853 854 855 856 857 858 859 860 |
{ struct path next; struct inode *inode; int err; unsigned int lookup_flags = nd->flags; while (*name=='/') name++; if (!*name) goto return_reval; |
4ac913785 Embed a struct pa... |
861 |
inode = nd->path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
862 |
if (nd->depth) |
f55eab822 [PATCH] VFS: Ensu... |
863 |
lookup_flags = LOOKUP_FOLLOW | (nd->flags & LOOKUP_CONTINUE); |
1da177e4c Linux-2.6.12-rc2 |
864 865 866 867 868 869 |
/* At this point we know we have a real path component. */ for(;;) { unsigned long hash; struct qstr this; unsigned int c; |
cdce5d6b9 VFS: Make link_pa... |
870 |
nd->flags |= LOOKUP_CONTINUE; |
1da177e4c Linux-2.6.12-rc2 |
871 |
err = exec_permission_lite(inode, nd); |
e4543eddf [PATCH] add a vfs... |
872 873 |
if (err == -EAGAIN) err = vfs_permission(nd, MAY_EXEC); |
1da177e4c Linux-2.6.12-rc2 |
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 |
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); /* remove trailing slashes? */ if (!c) goto last_component; while (*++name == '/'); if (!*name) goto last_with_slashes; /* * "." and ".." are special - ".." especially so because it has * to be able to know about the current root directory and * parent relationships. */ if (this.name[0] == '.') switch (this.len) { default: break; case 2: if (this.name[1] != '.') break; |
58c465eba [PATCH] namei fix... |
907 |
follow_dotdot(nd); |
4ac913785 Embed a struct pa... |
908 |
inode = nd->path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
909 910 911 912 913 914 915 916 |
/* fallthrough */ case 1: continue; } /* * See if the low-level filesystem might want * to use its own hash.. */ |
4ac913785 Embed a struct pa... |
917 918 919 |
if (nd->path.dentry->d_op && nd->path.dentry->d_op->d_hash) { err = nd->path.dentry->d_op->d_hash(nd->path.dentry, &this); |
1da177e4c Linux-2.6.12-rc2 |
920 921 922 |
if (err < 0) break; } |
1da177e4c Linux-2.6.12-rc2 |
923 924 925 926 |
/* This does the actual lookups.. */ err = do_lookup(nd, &this, &next); if (err) break; |
1da177e4c Linux-2.6.12-rc2 |
927 928 929 930 931 932 933 934 935 936 |
err = -ENOENT; inode = next.dentry->d_inode; if (!inode) goto out_dput; err = -ENOTDIR; if (!inode->i_op) goto out_dput; if (inode->i_op->follow_link) { |
90ebe5654 [PATCH] namei fixes |
937 |
err = do_follow_link(&next, nd); |
1da177e4c Linux-2.6.12-rc2 |
938 939 940 |
if (err) goto return_err; err = -ENOENT; |
4ac913785 Embed a struct pa... |
941 |
inode = nd->path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
942 943 944 945 946 |
if (!inode) break; err = -ENOTDIR; if (!inode->i_op) break; |
09dd17d3e [PATCH] namei cle... |
947 948 |
} else path_to_nameidata(&next, nd); |
1da177e4c Linux-2.6.12-rc2 |
949 950 951 952 953 954 955 956 957 |
err = -ENOTDIR; if (!inode->i_op->lookup) break; continue; /* here ends the main loop */ last_with_slashes: lookup_flags |= LOOKUP_FOLLOW | LOOKUP_DIRECTORY; last_component: |
f55eab822 [PATCH] VFS: Ensu... |
958 959 |
/* Clear LOOKUP_CONTINUE iff it was previously unset */ nd->flags &= lookup_flags | ~LOOKUP_CONTINUE; |
1da177e4c Linux-2.6.12-rc2 |
960 961 962 963 964 965 966 967 |
if (lookup_flags & LOOKUP_PARENT) goto lookup_parent; if (this.name[0] == '.') switch (this.len) { default: break; case 2: if (this.name[1] != '.') break; |
58c465eba [PATCH] namei fix... |
968 |
follow_dotdot(nd); |
4ac913785 Embed a struct pa... |
969 |
inode = nd->path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
970 971 972 973 |
/* fallthrough */ case 1: goto return_reval; } |
4ac913785 Embed a struct pa... |
974 975 976 |
if (nd->path.dentry->d_op && nd->path.dentry->d_op->d_hash) { err = nd->path.dentry->d_op->d_hash(nd->path.dentry, &this); |
1da177e4c Linux-2.6.12-rc2 |
977 978 979 980 981 982 |
if (err < 0) break; } err = do_lookup(nd, &this, &next); if (err) break; |
1da177e4c Linux-2.6.12-rc2 |
983 984 985 |
inode = next.dentry->d_inode; if ((lookup_flags & LOOKUP_FOLLOW) && inode && inode->i_op && inode->i_op->follow_link) { |
90ebe5654 [PATCH] namei fixes |
986 |
err = do_follow_link(&next, nd); |
1da177e4c Linux-2.6.12-rc2 |
987 988 |
if (err) goto return_err; |
4ac913785 Embed a struct pa... |
989 |
inode = nd->path.dentry->d_inode; |
09dd17d3e [PATCH] namei cle... |
990 991 |
} else path_to_nameidata(&next, nd); |
1da177e4c Linux-2.6.12-rc2 |
992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 |
err = -ENOENT; if (!inode) break; if (lookup_flags & LOOKUP_DIRECTORY) { err = -ENOTDIR; if (!inode->i_op || !inode->i_op->lookup) break; } goto return_base; lookup_parent: nd->last = this; nd->last_type = LAST_NORM; if (this.name[0] != '.') goto return_base; if (this.len == 1) nd->last_type = LAST_DOT; else if (this.len == 2 && this.name[1] == '.') nd->last_type = LAST_DOTDOT; else goto return_base; return_reval: /* * We bypassed the ordinary revalidation routines. * We may need to check the cached dentry for staleness. */ |
4ac913785 Embed a struct pa... |
1017 1018 |
if (nd->path.dentry && nd->path.dentry->d_sb && (nd->path.dentry->d_sb->s_type->fs_flags & FS_REVAL_DOT)) { |
1da177e4c Linux-2.6.12-rc2 |
1019 1020 |
err = -ESTALE; /* Note: we do not d_invalidate() */ |
4ac913785 Embed a struct pa... |
1021 1022 |
if (!nd->path.dentry->d_op->d_revalidate( nd->path.dentry, nd)) |
1da177e4c Linux-2.6.12-rc2 |
1023 1024 1025 1026 1027 |
break; } return_base: return 0; out_dput: |
1d957f9bf Introduce path_put() |
1028 |
path_put_conditional(&next, nd); |
1da177e4c Linux-2.6.12-rc2 |
1029 1030 |
break; } |
1d957f9bf Introduce path_put() |
1031 |
path_put(&nd->path); |
1da177e4c Linux-2.6.12-rc2 |
1032 1033 1034 |
return_err: return err; } |
fc9b52cd8 fs: remove fastca... |
1035 |
static int path_walk(const char *name, struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
1036 1037 1038 1039 |
{ current->total_link_count = 0; return link_path_walk(name, nd); } |
ea3834d9f namei: add audit_... |
1040 1041 1042 1043 |
/* * SMP-safe: Returns 1 and nd will have valid dentry and mnt, if * everything is done. Returns 0 and drops input nd, if lookup failed; */ |
1da177e4c Linux-2.6.12-rc2 |
1044 1045 1046 1047 |
static int __emul_lookup_dentry(const char *name, struct nameidata *nd) { if (path_walk(name, nd)) return 0; /* something went wrong... */ |
4ac913785 Embed a struct pa... |
1048 1049 |
if (!nd->path.dentry->d_inode || S_ISDIR(nd->path.dentry->d_inode->i_mode)) { |
09da5916b Use path_put() in... |
1050 |
struct path old_path = nd->path; |
1da177e4c Linux-2.6.12-rc2 |
1051 1052 |
struct qstr last = nd->last; int last_type = nd->last_type; |
e518ddb7b [PATCH] fs/namei.... |
1053 |
struct fs_struct *fs = current->fs; |
1da177e4c Linux-2.6.12-rc2 |
1054 |
/* |
e518ddb7b [PATCH] fs/namei.... |
1055 1056 |
* NAME was not found in alternate root or it's a directory. * Try to find it in the normal root: |
1da177e4c Linux-2.6.12-rc2 |
1057 1058 |
*/ nd->last_type = LAST_ROOT; |
e518ddb7b [PATCH] fs/namei.... |
1059 |
read_lock(&fs->lock); |
6ac08c39a Use struct path i... |
1060 1061 |
nd->path = fs->root; path_get(&fs->root); |
e518ddb7b [PATCH] fs/namei.... |
1062 |
read_unlock(&fs->lock); |
1da177e4c Linux-2.6.12-rc2 |
1063 |
if (path_walk(name, nd) == 0) { |
4ac913785 Embed a struct pa... |
1064 |
if (nd->path.dentry->d_inode) { |
09da5916b Use path_put() in... |
1065 |
path_put(&old_path); |
1da177e4c Linux-2.6.12-rc2 |
1066 1067 |
return 1; } |
1d957f9bf Introduce path_put() |
1068 |
path_put(&nd->path); |
1da177e4c Linux-2.6.12-rc2 |
1069 |
} |
09da5916b Use path_put() in... |
1070 |
nd->path = old_path; |
1da177e4c Linux-2.6.12-rc2 |
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 |
nd->last = last; nd->last_type = last_type; } return 1; } void set_fs_altroot(void) { char *emul = __emul_prefix(); struct nameidata nd; |
6ac08c39a Use struct path i... |
1081 |
struct path path = {}, old_path; |
1da177e4c Linux-2.6.12-rc2 |
1082 |
int err; |
e518ddb7b [PATCH] fs/namei.... |
1083 |
struct fs_struct *fs = current->fs; |
1da177e4c Linux-2.6.12-rc2 |
1084 1085 1086 1087 |
if (!emul) goto set_it; err = path_lookup(emul, LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_NOALT, &nd); |
6ac08c39a Use struct path i... |
1088 1089 |
if (!err) path = nd.path; |
1da177e4c Linux-2.6.12-rc2 |
1090 |
set_it: |
e518ddb7b [PATCH] fs/namei.... |
1091 |
write_lock(&fs->lock); |
6ac08c39a Use struct path i... |
1092 1093 |
old_path = fs->altroot; fs->altroot = path; |
e518ddb7b [PATCH] fs/namei.... |
1094 |
write_unlock(&fs->lock); |
6ac08c39a Use struct path i... |
1095 1096 |
if (old_path.dentry) path_put(&old_path); |
1da177e4c Linux-2.6.12-rc2 |
1097 |
} |
ea3834d9f namei: add audit_... |
1098 |
/* Returns 0 and nd will be valid on success; Retuns error, otherwise. */ |
fc9b52cd8 fs: remove fastca... |
1099 |
static int do_path_lookup(int dfd, const char *name, |
5590ff0d5 [PATCH] vfs: *at ... |
1100 |
unsigned int flags, struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
1101 |
{ |
ea3834d9f namei: add audit_... |
1102 |
int retval = 0; |
170aa3d02 [PATCH] namei.c: ... |
1103 1104 |
int fput_needed; struct file *file; |
e518ddb7b [PATCH] fs/namei.... |
1105 |
struct fs_struct *fs = current->fs; |
1da177e4c Linux-2.6.12-rc2 |
1106 1107 1108 1109 |
nd->last_type = LAST_ROOT; /* if there are only slashes... */ nd->flags = flags; nd->depth = 0; |
1da177e4c Linux-2.6.12-rc2 |
1110 |
if (*name=='/') { |
e518ddb7b [PATCH] fs/namei.... |
1111 |
read_lock(&fs->lock); |
6ac08c39a Use struct path i... |
1112 1113 1114 |
if (fs->altroot.dentry && !(nd->flags & LOOKUP_NOALT)) { nd->path = fs->altroot; path_get(&fs->altroot); |
e518ddb7b [PATCH] fs/namei.... |
1115 |
read_unlock(&fs->lock); |
1da177e4c Linux-2.6.12-rc2 |
1116 |
if (__emul_lookup_dentry(name,nd)) |
ea3834d9f namei: add audit_... |
1117 |
goto out; /* found in altroot */ |
e518ddb7b [PATCH] fs/namei.... |
1118 |
read_lock(&fs->lock); |
1da177e4c Linux-2.6.12-rc2 |
1119 |
} |
6ac08c39a Use struct path i... |
1120 1121 |
nd->path = fs->root; path_get(&fs->root); |
e518ddb7b [PATCH] fs/namei.... |
1122 |
read_unlock(&fs->lock); |
5590ff0d5 [PATCH] vfs: *at ... |
1123 |
} else if (dfd == AT_FDCWD) { |
e518ddb7b [PATCH] fs/namei.... |
1124 |
read_lock(&fs->lock); |
6ac08c39a Use struct path i... |
1125 1126 |
nd->path = fs->pwd; path_get(&fs->pwd); |
e518ddb7b [PATCH] fs/namei.... |
1127 |
read_unlock(&fs->lock); |
5590ff0d5 [PATCH] vfs: *at ... |
1128 |
} else { |
5590ff0d5 [PATCH] vfs: *at ... |
1129 1130 1131 |
struct dentry *dentry; file = fget_light(dfd, &fput_needed); |
170aa3d02 [PATCH] namei.c: ... |
1132 1133 |
retval = -EBADF; if (!file) |
6d09bb627 [PATCH] fs/namei.... |
1134 |
goto out_fail; |
5590ff0d5 [PATCH] vfs: *at ... |
1135 |
|
0f7fc9e4d [PATCH] VFS: chan... |
1136 |
dentry = file->f_path.dentry; |
5590ff0d5 [PATCH] vfs: *at ... |
1137 |
|
170aa3d02 [PATCH] namei.c: ... |
1138 1139 |
retval = -ENOTDIR; if (!S_ISDIR(dentry->d_inode->i_mode)) |
6d09bb627 [PATCH] fs/namei.... |
1140 |
goto fput_fail; |
5590ff0d5 [PATCH] vfs: *at ... |
1141 1142 |
retval = file_permission(file, MAY_EXEC); |
170aa3d02 [PATCH] namei.c: ... |
1143 |
if (retval) |
6d09bb627 [PATCH] fs/namei.... |
1144 |
goto fput_fail; |
5590ff0d5 [PATCH] vfs: *at ... |
1145 |
|
5dd784d04 Introduce path_get() |
1146 1147 |
nd->path = file->f_path; path_get(&file->f_path); |
5590ff0d5 [PATCH] vfs: *at ... |
1148 1149 |
fput_light(file, fput_needed); |
1da177e4c Linux-2.6.12-rc2 |
1150 |
} |
2dfdd266b fs: use path_walk... |
1151 1152 |
retval = path_walk(name, nd); |
ea3834d9f namei: add audit_... |
1153 |
out: |
4ac913785 Embed a struct pa... |
1154 1155 1156 |
if (unlikely(!retval && !audit_dummy_context() && nd->path.dentry && nd->path.dentry->d_inode)) audit_inode(name, nd->path.dentry); |
6d09bb627 [PATCH] fs/namei.... |
1157 |
out_fail: |
170aa3d02 [PATCH] namei.c: ... |
1158 |
return retval; |
6d09bb627 [PATCH] fs/namei.... |
1159 |
fput_fail: |
170aa3d02 [PATCH] namei.c: ... |
1160 |
fput_light(file, fput_needed); |
6d09bb627 [PATCH] fs/namei.... |
1161 |
goto out_fail; |
1da177e4c Linux-2.6.12-rc2 |
1162 |
} |
fc9b52cd8 fs: remove fastca... |
1163 |
int path_lookup(const char *name, unsigned int flags, |
5590ff0d5 [PATCH] vfs: *at ... |
1164 1165 1166 1167 |
struct nameidata *nd) { return do_path_lookup(AT_FDCWD, name, flags, nd); } |
16f182002 fs: introduce vfs... |
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 |
/** * 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 * @nd: pointer to nameidata */ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt, const char *name, unsigned int flags, struct nameidata *nd) { int retval; /* same as do_path_lookup */ nd->last_type = LAST_ROOT; nd->flags = flags; nd->depth = 0; |
4ac913785 Embed a struct pa... |
1186 1187 |
nd->path.mnt = mntget(mnt); nd->path.dentry = dget(dentry); |
16f182002 fs: introduce vfs... |
1188 1189 |
retval = path_walk(name, nd); |
4ac913785 Embed a struct pa... |
1190 1191 1192 |
if (unlikely(!retval && !audit_dummy_context() && nd->path.dentry && nd->path.dentry->d_inode)) audit_inode(name, nd->path.dentry); |
16f182002 fs: introduce vfs... |
1193 1194 1195 1196 |
return retval; } |
5590ff0d5 [PATCH] vfs: *at ... |
1197 1198 1199 |
static int __path_lookup_intent_open(int dfd, const char *name, unsigned int lookup_flags, struct nameidata *nd, int open_flags, int create_mode) |
834f2a4a1 VFS: Allow the fi... |
1200 1201 1202 1203 1204 1205 1206 1207 1208 |
{ struct file *filp = get_empty_filp(); int err; if (filp == NULL) return -ENFILE; nd->intent.open.file = filp; nd->intent.open.flags = open_flags; nd->intent.open.create_mode = create_mode; |
5590ff0d5 [PATCH] vfs: *at ... |
1209 |
err = do_path_lookup(dfd, name, lookup_flags|LOOKUP_OPEN, nd); |
834f2a4a1 VFS: Allow the fi... |
1210 1211 1212 |
if (IS_ERR(nd->intent.open.file)) { if (err == 0) { err = PTR_ERR(nd->intent.open.file); |
1d957f9bf Introduce path_put() |
1213 |
path_put(&nd->path); |
834f2a4a1 VFS: Allow the fi... |
1214 1215 1216 1217 1218 1219 1220 1221 |
} } else if (err != 0) release_open_intent(nd); return err; } /** * path_lookup_open - lookup a file path with open intent |
7045f37b1 [PATCH] DocBook: ... |
1222 |
* @dfd: the directory to use as base, or AT_FDCWD |
834f2a4a1 VFS: Allow the fi... |
1223 1224 1225 1226 1227 |
* @name: pointer to file name * @lookup_flags: lookup intent flags * @nd: pointer to nameidata * @open_flags: open intent flags */ |
5590ff0d5 [PATCH] vfs: *at ... |
1228 |
int path_lookup_open(int dfd, const char *name, unsigned int lookup_flags, |
834f2a4a1 VFS: Allow the fi... |
1229 1230 |
struct nameidata *nd, int open_flags) { |
5590ff0d5 [PATCH] vfs: *at ... |
1231 |
return __path_lookup_intent_open(dfd, name, lookup_flags, nd, |
834f2a4a1 VFS: Allow the fi... |
1232 1233 1234 1235 1236 |
open_flags, 0); } /** * path_lookup_create - lookup a file path with open + create intent |
7045f37b1 [PATCH] DocBook: ... |
1237 |
* @dfd: the directory to use as base, or AT_FDCWD |
834f2a4a1 VFS: Allow the fi... |
1238 1239 1240 1241 1242 1243 |
* @name: pointer to file name * @lookup_flags: lookup intent flags * @nd: pointer to nameidata * @open_flags: open intent flags * @create_mode: create intent flags */ |
5590ff0d5 [PATCH] vfs: *at ... |
1244 1245 1246 |
static int path_lookup_create(int dfd, const char *name, unsigned int lookup_flags, struct nameidata *nd, int open_flags, int create_mode) |
834f2a4a1 VFS: Allow the fi... |
1247 |
{ |
5590ff0d5 [PATCH] vfs: *at ... |
1248 1249 |
return __path_lookup_intent_open(dfd, name, lookup_flags|LOOKUP_CREATE, nd, open_flags, create_mode); |
834f2a4a1 VFS: Allow the fi... |
1250 1251 1252 1253 1254 1255 1256 1257 1258 |
} int __user_path_lookup_open(const char __user *name, unsigned int lookup_flags, struct nameidata *nd, int open_flags) { char *tmp = getname(name); int err = PTR_ERR(tmp); if (!IS_ERR(tmp)) { |
5590ff0d5 [PATCH] vfs: *at ... |
1259 |
err = __path_lookup_intent_open(AT_FDCWD, tmp, lookup_flags, nd, open_flags, 0); |
834f2a4a1 VFS: Allow the fi... |
1260 1261 1262 1263 |
putname(tmp); } return err; } |
eead19115 partially fix up ... |
1264 1265 |
static struct dentry *__lookup_hash(struct qstr *name, struct dentry *base, struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
1266 |
{ |
057f6c019 security: prevent... |
1267 |
struct dentry *dentry; |
1da177e4c Linux-2.6.12-rc2 |
1268 1269 1270 1271 |
struct inode *inode; int err; inode = base->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 |
/* * See if the low-level filesystem might want * to use its own hash.. */ if (base->d_op && base->d_op->d_hash) { err = base->d_op->d_hash(base, name); dentry = ERR_PTR(err); if (err < 0) goto out; } dentry = cached_lookup(base, name, nd); if (!dentry) { struct dentry *new = d_alloc(base, name); dentry = ERR_PTR(-ENOMEM); if (!new) goto out; dentry = inode->i_op->lookup(inode, new, nd); if (!dentry) dentry = new; else dput(new); } out: return dentry; } |
057f6c019 security: prevent... |
1299 1300 1301 1302 1303 |
/* * 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 ... |
1304 |
static struct dentry *lookup_hash(struct nameidata *nd) |
057f6c019 security: prevent... |
1305 |
{ |
057f6c019 security: prevent... |
1306 |
int err; |
4ac913785 Embed a struct pa... |
1307 |
err = permission(nd->path.dentry->d_inode, MAY_EXEC, nd); |
057f6c019 security: prevent... |
1308 |
if (err) |
eead19115 partially fix up ... |
1309 |
return ERR_PTR(err); |
4ac913785 Embed a struct pa... |
1310 |
return __lookup_hash(&nd->last, nd->path.dentry, nd); |
1da177e4c Linux-2.6.12-rc2 |
1311 |
} |
eead19115 partially fix up ... |
1312 1313 |
static int __lookup_one_len(const char *name, struct qstr *this, struct dentry *base, int len) |
1da177e4c Linux-2.6.12-rc2 |
1314 1315 |
{ unsigned long hash; |
1da177e4c Linux-2.6.12-rc2 |
1316 |
unsigned int c; |
057f6c019 security: prevent... |
1317 1318 |
this->name = name; this->len = len; |
1da177e4c Linux-2.6.12-rc2 |
1319 |
if (!len) |
057f6c019 security: prevent... |
1320 |
return -EACCES; |
1da177e4c Linux-2.6.12-rc2 |
1321 1322 1323 1324 1325 |
hash = init_name_hash(); while (len--) { c = *(const unsigned char *)name++; if (c == '/' || c == '\0') |
057f6c019 security: prevent... |
1326 |
return -EACCES; |
1da177e4c Linux-2.6.12-rc2 |
1327 1328 |
hash = partial_name_hash(c, hash); } |
057f6c019 security: prevent... |
1329 1330 1331 |
this->hash = end_name_hash(hash); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1332 |
|
eead19115 partially fix up ... |
1333 |
/** |
a6b91919e fs: fix kernel-do... |
1334 |
* lookup_one_len - filesystem helper to lookup single pathname component |
eead19115 partially fix up ... |
1335 1336 1337 1338 |
* @name: pathname component to lookup * @base: base directory to lookup from * @len: maximum length @len should be interpreted to * |
a6b91919e fs: fix kernel-do... |
1339 1340 |
* 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 ... |
1341 1342 1343 |
* nameidata argument is passed to the filesystem methods and a filesystem * using this helper needs to be prepared for that. */ |
057f6c019 security: prevent... |
1344 1345 1346 1347 1348 1349 1350 1351 |
struct dentry *lookup_one_len(const char *name, struct dentry *base, int len) { int err; struct qstr this; err = __lookup_one_len(name, &this, base, len); if (err) return ERR_PTR(err); |
eead19115 partially fix up ... |
1352 1353 1354 1355 |
err = permission(base->d_inode, MAY_EXEC, NULL); if (err) return ERR_PTR(err); |
49705b774 [PATCH] sanitize ... |
1356 |
return __lookup_hash(&this, base, NULL); |
057f6c019 security: prevent... |
1357 |
} |
eead19115 partially fix up ... |
1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 |
/** * lookup_one_noperm - bad hack for sysfs * @name: pathname component to lookup * @base: base directory to lookup from * * This is a variant of lookup_one_len that doesn't perform any permission * checks. It's a horrible hack to work around the braindead sysfs * architecture and should not be used anywhere else. * * DON'T USE THIS FUNCTION EVER, thanks. */ struct dentry *lookup_one_noperm(const char *name, struct dentry *base) |
057f6c019 security: prevent... |
1370 1371 1372 |
{ int err; struct qstr this; |
eead19115 partially fix up ... |
1373 |
err = __lookup_one_len(name, &this, base, strlen(name)); |
057f6c019 security: prevent... |
1374 1375 |
if (err) return ERR_PTR(err); |
eead19115 partially fix up ... |
1376 |
return __lookup_hash(&this, base, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1377 |
} |
fc9b52cd8 fs: remove fastca... |
1378 |
int __user_walk_fd(int dfd, const char __user *name, unsigned flags, |
5590ff0d5 [PATCH] vfs: *at ... |
1379 |
struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
1380 1381 1382 1383 1384 |
{ char *tmp = getname(name); int err = PTR_ERR(tmp); if (!IS_ERR(tmp)) { |
5590ff0d5 [PATCH] vfs: *at ... |
1385 |
err = do_path_lookup(dfd, tmp, flags, nd); |
1da177e4c Linux-2.6.12-rc2 |
1386 1387 1388 1389 |
putname(tmp); } return err; } |
fc9b52cd8 fs: remove fastca... |
1390 |
int __user_walk(const char __user *name, unsigned flags, struct nameidata *nd) |
5590ff0d5 [PATCH] vfs: *at ... |
1391 1392 1393 |
{ return __user_walk_fd(AT_FDCWD, name, flags, nd); } |
1da177e4c Linux-2.6.12-rc2 |
1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 |
/* * 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) { if (!(dir->i_mode & S_ISVTX)) return 0; if (inode->i_uid == current->fsuid) return 0; if (dir->i_uid == current->fsuid) return 0; return !capable(CAP_FOWNER); } /* * 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... |
1428 |
static int may_delete(struct inode *dir,struct dentry *victim,int isdir) |
1da177e4c Linux-2.6.12-rc2 |
1429 1430 1431 1432 1433 1434 1435 |
{ int error; if (!victim->d_inode) return -ENOENT; BUG_ON(victim->d_parent->d_inode != dir); |
5a190ae69 [PATCH] pass dent... |
1436 |
audit_inode_child(victim->d_name.name, victim, dir); |
1da177e4c Linux-2.6.12-rc2 |
1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 |
error = permission(dir,MAY_WRITE | MAY_EXEC, NULL); if (error) return error; if (IS_APPEND(dir)) return -EPERM; if (check_sticky(dir, victim->d_inode)||IS_APPEND(victim->d_inode)|| IS_IMMUTABLE(victim->d_inode)) 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()) */ static inline int may_create(struct inode *dir, struct dentry *child, struct nameidata *nd) { if (child->d_inode) return -EEXIST; if (IS_DEADDIR(dir)) return -ENOENT; return permission(dir,MAY_WRITE | MAY_EXEC, nd); } /* |
1da177e4c Linux-2.6.12-rc2 |
1479 1480 1481 1482 1483 1484 1485 1486 1487 |
* O_DIRECTORY translates into forcing a directory lookup. */ static inline int lookup_flags(unsigned int f) { unsigned long retval = LOOKUP_FOLLOW; if (f & O_NOFOLLOW) retval &= ~LOOKUP_FOLLOW; |
1da177e4c Linux-2.6.12-rc2 |
1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 |
if (f & O_DIRECTORY) retval |= LOOKUP_DIRECTORY; return retval; } /* * 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: ... |
1502 |
mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_PARENT); |
1da177e4c Linux-2.6.12-rc2 |
1503 1504 |
return NULL; } |
a11f3a057 [PATCH] sem2mutex... |
1505 |
mutex_lock(&p1->d_inode->i_sb->s_vfs_rename_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1506 1507 1508 |
for (p = p1; p->d_parent != p; p = p->d_parent) { if (p->d_parent == p2) { |
f2eace23e [PATCH] lockdep: ... |
1509 1510 |
mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_PARENT); mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_CHILD); |
1da177e4c Linux-2.6.12-rc2 |
1511 1512 1513 1514 1515 1516 |
return p; } } for (p = p2; p->d_parent != p; p = p->d_parent) { if (p->d_parent == p1) { |
f2eace23e [PATCH] lockdep: ... |
1517 1518 |
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 |
1519 1520 1521 |
return p; } } |
f2eace23e [PATCH] lockdep: ... |
1522 1523 |
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 |
1524 1525 1526 1527 1528 |
return NULL; } void unlock_rename(struct dentry *p1, struct dentry *p2) { |
1b1dcc1b5 [PATCH] mutex sub... |
1529 |
mutex_unlock(&p1->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1530 |
if (p1 != p2) { |
1b1dcc1b5 [PATCH] mutex sub... |
1531 |
mutex_unlock(&p2->d_inode->i_mutex); |
a11f3a057 [PATCH] sem2mutex... |
1532 |
mutex_unlock(&p1->d_inode->i_sb->s_vfs_rename_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 |
} } int vfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) { int error = may_create(dir, dentry, nd); if (error) return error; if (!dir->i_op || !dir->i_op->create) return -EACCES; /* shouldn't it be ENOSYS? */ mode &= S_IALLUGO; mode |= S_IFREG; error = security_inode_create(dir, dentry, mode); if (error) return error; DQUOT_INIT(dir); error = dir->i_op->create(dir, dentry, mode, nd); |
a74574aaf [PATCH] Remove se... |
1553 |
if (!error) |
f38aa9422 [PATCH] Pass dent... |
1554 |
fsnotify_create(dir, dentry); |
1da177e4c Linux-2.6.12-rc2 |
1555 1556 1557 1558 1559 |
return error; } int may_open(struct nameidata *nd, int acc_mode, int flag) { |
4ac913785 Embed a struct pa... |
1560 |
struct dentry *dentry = nd->path.dentry; |
1da177e4c Linux-2.6.12-rc2 |
1561 1562 1563 1564 1565 1566 1567 1568 1569 |
struct inode *inode = dentry->d_inode; int error; if (!inode) return -ENOENT; if (S_ISLNK(inode->i_mode)) return -ELOOP; |
974a9f0b4 Use access mode i... |
1570 |
if (S_ISDIR(inode->i_mode) && (acc_mode & MAY_WRITE)) |
1da177e4c Linux-2.6.12-rc2 |
1571 |
return -EISDIR; |
1da177e4c Linux-2.6.12-rc2 |
1572 1573 1574 1575 1576 1577 1578 1579 |
/* * FIFO's, sockets and device files are special: they don't * actually live on the filesystem itself, and as such you * can write to them even if the filesystem is read-only. */ if (S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { flag &= ~O_TRUNC; } else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { |
4ac913785 Embed a struct pa... |
1580 |
if (nd->path.mnt->mnt_flags & MNT_NODEV) |
1da177e4c Linux-2.6.12-rc2 |
1581 1582 1583 |
return -EACCES; flag &= ~O_TRUNC; |
4a3fd211c [PATCH] r/o bind ... |
1584 |
} |
b41572e92 r/o bind mounts: ... |
1585 1586 1587 1588 |
error = vfs_permission(nd, acc_mode); if (error) return error; |
1da177e4c Linux-2.6.12-rc2 |
1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 |
/* * An append-only file must be opened in append mode for writing. */ if (IS_APPEND(inode)) { if ((flag & FMODE_WRITE) && !(flag & O_APPEND)) return -EPERM; if (flag & O_TRUNC) return -EPERM; } /* O_NOATIME can only be set by the owner or superuser */ if (flag & O_NOATIME) |
3bd858ab1 Introduce is_owne... |
1601 |
if (!is_owner_or_cap(inode)) |
1da177e4c Linux-2.6.12-rc2 |
1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 |
return -EPERM; /* * Ensure there are no outstanding leases on the file. */ error = break_lease(inode, flag); if (error) return error; if (flag & O_TRUNC) { 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) { DQUOT_INIT(inode); |
d139d7ffd VFS: allow filesy... |
1622 1623 1624 1625 |
error = do_truncate(dentry, 0, ATTR_MTIME|ATTR_CTIME|ATTR_OPEN, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 |
} put_write_access(inode); if (error) return error; } else if (flag & FMODE_WRITE) DQUOT_INIT(inode); return 0; } |
d57999e15 [PATCH] do namei_... |
1636 1637 1638 1639 1640 1641 |
/* * Be careful about ever adding any more callers of this * function. Its flags must be in the namei format, not * what get passed to sys_open(). */ static int __open_namei_create(struct nameidata *nd, struct path *path, |
aab520e2f [PATCH] r/o bind ... |
1642 1643 1644 |
int flag, int mode) { int error; |
4ac913785 Embed a struct pa... |
1645 |
struct dentry *dir = nd->path.dentry; |
aab520e2f [PATCH] r/o bind ... |
1646 1647 1648 1649 1650 |
if (!IS_POSIXACL(dir->d_inode)) mode &= ~current->fs->umask; error = vfs_create(dir->d_inode, path->dentry, mode, nd); mutex_unlock(&dir->d_inode->i_mutex); |
4ac913785 Embed a struct pa... |
1651 1652 |
dput(nd->path.dentry); nd->path.dentry = path->dentry; |
aab520e2f [PATCH] r/o bind ... |
1653 1654 1655 1656 1657 |
if (error) return error; /* Don't check for write permission, don't truncate */ return may_open(nd, 0, flag & ~O_TRUNC); } |
1da177e4c Linux-2.6.12-rc2 |
1658 |
/* |
d57999e15 [PATCH] do namei_... |
1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 |
* Note that while the flag value (low two bits) for sys_open means: * 00 - read-only * 01 - write-only * 10 - read-write * 11 - special * it is changed into * 00 - no permissions needed * 01 - read-permission * 10 - write-permission * 11 - read-write * for the internal routines (ie open_namei()/follow_link() etc) * This is more logical, and also allows the 00 "no perm needed" * to be used for symlinks (where the permissions are checked * later). * */ static inline int open_to_namei_flags(int flag) { if ((flag+1) & O_ACCMODE) flag++; return flag; } |
4a3fd211c [PATCH] r/o bind ... |
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 |
static int open_will_write_to_fs(int flag, struct inode *inode) { /* * We'll never write to the fs underlying * a device file. */ if (special_file(inode->i_mode)) return 0; return (flag & O_TRUNC); } |
d57999e15 [PATCH] do namei_... |
1691 |
/* |
4a3fd211c [PATCH] r/o bind ... |
1692 1693 1694 |
* Note that the low bits of the passed in "open_flag" * are not the same as in the local variable "flag". See * open_to_namei_flags() for more details. |
1da177e4c Linux-2.6.12-rc2 |
1695 |
*/ |
a70e65df8 [PATCH] merge ope... |
1696 1697 |
struct file *do_filp_open(int dfd, const char *pathname, int open_flag, int mode) |
1da177e4c Linux-2.6.12-rc2 |
1698 |
{ |
4a3fd211c [PATCH] r/o bind ... |
1699 |
struct file *filp; |
a70e65df8 [PATCH] merge ope... |
1700 |
struct nameidata nd; |
834f2a4a1 VFS: Allow the fi... |
1701 |
int acc_mode, error; |
4e7506e4d [PATCH] namei fix... |
1702 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
1703 1704 |
struct dentry *dir; int count = 0; |
4a3fd211c [PATCH] r/o bind ... |
1705 |
int will_write; |
d57999e15 [PATCH] do namei_... |
1706 |
int flag = open_to_namei_flags(open_flag); |
1da177e4c Linux-2.6.12-rc2 |
1707 1708 |
acc_mode = ACC_MODE(flag); |
834f2a4a1 VFS: Allow the fi... |
1709 1710 1711 |
/* O_TRUNC implies we need access checks for write permissions */ if (flag & O_TRUNC) acc_mode |= MAY_WRITE; |
1da177e4c Linux-2.6.12-rc2 |
1712 1713 1714 1715 |
/* Allow the LSM permission hook to distinguish append access from general write access. */ if (flag & O_APPEND) acc_mode |= MAY_APPEND; |
1da177e4c Linux-2.6.12-rc2 |
1716 1717 1718 1719 |
/* * The simplest case - just a plain lookup. */ if (!(flag & O_CREAT)) { |
5590ff0d5 [PATCH] vfs: *at ... |
1720 |
error = path_lookup_open(dfd, pathname, lookup_flags(flag), |
a70e65df8 [PATCH] merge ope... |
1721 |
&nd, flag); |
1da177e4c Linux-2.6.12-rc2 |
1722 |
if (error) |
a70e65df8 [PATCH] merge ope... |
1723 |
return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
1724 1725 1726 1727 1728 1729 |
goto ok; } /* * Create - we need to know the parent. */ |
a70e65df8 [PATCH] merge ope... |
1730 1731 |
error = path_lookup_create(dfd, pathname, LOOKUP_PARENT, &nd, flag, mode); |
1da177e4c Linux-2.6.12-rc2 |
1732 |
if (error) |
a70e65df8 [PATCH] merge ope... |
1733 |
return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
1734 1735 1736 1737 1738 1739 1740 |
/* * We have the parent and last component. First of all, check * that we are not asked to creat(2) an obvious directory - that * will not do. */ error = -EISDIR; |
a70e65df8 [PATCH] merge ope... |
1741 |
if (nd.last_type != LAST_NORM || nd.last.name[nd.last.len]) |
1da177e4c Linux-2.6.12-rc2 |
1742 |
goto exit; |
a70e65df8 [PATCH] merge ope... |
1743 1744 |
dir = nd.path.dentry; nd.flags &= ~LOOKUP_PARENT; |
1b1dcc1b5 [PATCH] mutex sub... |
1745 |
mutex_lock(&dir->d_inode->i_mutex); |
a70e65df8 [PATCH] merge ope... |
1746 1747 |
path.dentry = lookup_hash(&nd); path.mnt = nd.path.mnt; |
1da177e4c Linux-2.6.12-rc2 |
1748 1749 |
do_last: |
4e7506e4d [PATCH] namei fix... |
1750 1751 |
error = PTR_ERR(path.dentry); if (IS_ERR(path.dentry)) { |
1b1dcc1b5 [PATCH] mutex sub... |
1752 |
mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1753 1754 |
goto exit; } |
a70e65df8 [PATCH] merge ope... |
1755 |
if (IS_ERR(nd.intent.open.file)) { |
a70e65df8 [PATCH] merge ope... |
1756 |
error = PTR_ERR(nd.intent.open.file); |
4a3fd211c [PATCH] r/o bind ... |
1757 |
goto exit_mutex_unlock; |
4af4c52f3 [PATCH] Missed er... |
1758 |
} |
1da177e4c Linux-2.6.12-rc2 |
1759 |
/* Negative dentry, just create the file */ |
4e7506e4d [PATCH] namei fix... |
1760 |
if (!path.dentry->d_inode) { |
4a3fd211c [PATCH] r/o bind ... |
1761 1762 1763 1764 1765 1766 1767 1768 |
/* * This write is needed to ensure that a * ro->rw transition does not occur between * 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); |
1da177e4c Linux-2.6.12-rc2 |
1769 |
if (error) |
4a3fd211c [PATCH] r/o bind ... |
1770 1771 1772 1773 |
goto exit_mutex_unlock; error = __open_namei_create(&nd, &path, flag, mode); if (error) { mnt_drop_write(nd.path.mnt); |
1da177e4c Linux-2.6.12-rc2 |
1774 |
goto exit; |
4a3fd211c [PATCH] r/o bind ... |
1775 1776 1777 1778 |
} filp = nameidata_to_filp(&nd, open_flag); mnt_drop_write(nd.path.mnt); return filp; |
1da177e4c Linux-2.6.12-rc2 |
1779 1780 1781 1782 1783 |
} /* * It already exists. */ |
1b1dcc1b5 [PATCH] mutex sub... |
1784 |
mutex_unlock(&dir->d_inode->i_mutex); |
5a190ae69 [PATCH] pass dent... |
1785 |
audit_inode(pathname, path.dentry); |
1da177e4c Linux-2.6.12-rc2 |
1786 1787 1788 1789 |
error = -EEXIST; if (flag & O_EXCL) goto exit_dput; |
e13b210f6 [PATCH] namei fix... |
1790 |
if (__follow_mount(&path)) { |
1da177e4c Linux-2.6.12-rc2 |
1791 |
error = -ELOOP; |
ba7a4c1a7 [PATCH] namei fix... |
1792 1793 |
if (flag & O_NOFOLLOW) goto exit_dput; |
1da177e4c Linux-2.6.12-rc2 |
1794 |
} |
3e2efce06 [PATCH] fix fault... |
1795 |
|
1da177e4c Linux-2.6.12-rc2 |
1796 |
error = -ENOENT; |
4e7506e4d [PATCH] namei fix... |
1797 |
if (!path.dentry->d_inode) |
1da177e4c Linux-2.6.12-rc2 |
1798 |
goto exit_dput; |
4e7506e4d [PATCH] namei fix... |
1799 |
if (path.dentry->d_inode->i_op && path.dentry->d_inode->i_op->follow_link) |
1da177e4c Linux-2.6.12-rc2 |
1800 |
goto do_link; |
a70e65df8 [PATCH] merge ope... |
1801 |
path_to_nameidata(&path, &nd); |
1da177e4c Linux-2.6.12-rc2 |
1802 |
error = -EISDIR; |
4e7506e4d [PATCH] namei fix... |
1803 |
if (path.dentry->d_inode && S_ISDIR(path.dentry->d_inode->i_mode)) |
1da177e4c Linux-2.6.12-rc2 |
1804 1805 |
goto exit; ok: |
4a3fd211c [PATCH] r/o bind ... |
1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 |
/* * Consider: * 1. may_open() truncates a file * 2. a rw->ro mount transition occurs * 3. nameidata_to_filp() fails due to * the ro mount. * That would be inconsistent, and should * be avoided. Taking this mnt write here * ensures that (2) can not occur. */ will_write = open_will_write_to_fs(flag, nd.path.dentry->d_inode); if (will_write) { error = mnt_want_write(nd.path.mnt); if (error) goto exit; } |
a70e65df8 [PATCH] merge ope... |
1822 |
error = may_open(&nd, acc_mode, flag); |
4a3fd211c [PATCH] r/o bind ... |
1823 1824 1825 |
if (error) { if (will_write) mnt_drop_write(nd.path.mnt); |
1da177e4c Linux-2.6.12-rc2 |
1826 |
goto exit; |
4a3fd211c [PATCH] r/o bind ... |
1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 |
} filp = nameidata_to_filp(&nd, open_flag); /* * It is now safe to drop the mnt write * because the filp has had a write taken * on its behalf. */ if (will_write) mnt_drop_write(nd.path.mnt); return filp; |
1da177e4c Linux-2.6.12-rc2 |
1837 |
|
4a3fd211c [PATCH] r/o bind ... |
1838 1839 |
exit_mutex_unlock: mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1840 |
exit_dput: |
a70e65df8 [PATCH] merge ope... |
1841 |
path_put_conditional(&path, &nd); |
1da177e4c Linux-2.6.12-rc2 |
1842 |
exit: |
a70e65df8 [PATCH] merge ope... |
1843 1844 1845 1846 |
if (!IS_ERR(nd.intent.open.file)) release_open_intent(&nd); path_put(&nd.path); return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 |
do_link: error = -ELOOP; if (flag & O_NOFOLLOW) goto exit_dput; /* * This is subtle. Instead of calling do_follow_link() we do the * thing by hands. The reason is that this way we have zero link_count * and path_walk() (called from ->follow_link) honoring LOOKUP_PARENT. * After that we have the parent and last component, i.e. * we are in the same situation as after the first path_walk(). * Well, almost - if the last component is normal we get its copy * stored in nd->last.name and we will have to putname() it when we * are done. Procfs-like symlinks just set LAST_BIND. */ |
a70e65df8 [PATCH] merge ope... |
1862 1863 |
nd.flags |= LOOKUP_PARENT; error = security_inode_follow_link(path.dentry, &nd); |
1da177e4c Linux-2.6.12-rc2 |
1864 1865 |
if (error) goto exit_dput; |
a70e65df8 [PATCH] merge ope... |
1866 |
error = __do_follow_link(&path, &nd); |
de4592153 [PATCH] struct fi... |
1867 1868 1869 1870 1871 |
if (error) { /* Does someone understand code flow here? Or it is only * me so stupid? Anathema to whoever designed this non-sense * with "intent.open". */ |
a70e65df8 [PATCH] merge ope... |
1872 1873 |
release_open_intent(&nd); return ERR_PTR(error); |
de4592153 [PATCH] struct fi... |
1874 |
} |
a70e65df8 [PATCH] merge ope... |
1875 1876 |
nd.flags &= ~LOOKUP_PARENT; if (nd.last_type == LAST_BIND) |
1da177e4c Linux-2.6.12-rc2 |
1877 |
goto ok; |
1da177e4c Linux-2.6.12-rc2 |
1878 |
error = -EISDIR; |
a70e65df8 [PATCH] merge ope... |
1879 |
if (nd.last_type != LAST_NORM) |
1da177e4c Linux-2.6.12-rc2 |
1880 |
goto exit; |
a70e65df8 [PATCH] merge ope... |
1881 1882 |
if (nd.last.name[nd.last.len]) { __putname(nd.last.name); |
1da177e4c Linux-2.6.12-rc2 |
1883 1884 1885 1886 |
goto exit; } error = -ELOOP; if (count++==32) { |
a70e65df8 [PATCH] merge ope... |
1887 |
__putname(nd.last.name); |
1da177e4c Linux-2.6.12-rc2 |
1888 1889 |
goto exit; } |
a70e65df8 [PATCH] merge ope... |
1890 |
dir = nd.path.dentry; |
1b1dcc1b5 [PATCH] mutex sub... |
1891 |
mutex_lock(&dir->d_inode->i_mutex); |
a70e65df8 [PATCH] merge ope... |
1892 1893 1894 |
path.dentry = lookup_hash(&nd); path.mnt = nd.path.mnt; __putname(nd.last.name); |
1da177e4c Linux-2.6.12-rc2 |
1895 1896 1897 1898 |
goto do_last; } /** |
a70e65df8 [PATCH] merge ope... |
1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 |
* filp_open - open file and return file pointer * * @filename: path to open * @flags: open flags as per the open(2) second argument * @mode: mode for the new file if O_CREAT is set, else ignored * * This is the helper to open a file from kernelspace if you really * have to. But in generally you should not do this, so please move * along, nothing to see here.. */ struct file *filp_open(const char *filename, int flags, int mode) { return do_filp_open(AT_FDCWD, filename, flags, mode); } EXPORT_SYMBOL(filp_open); /** |
1da177e4c Linux-2.6.12-rc2 |
1916 1917 1918 1919 1920 1921 |
* lookup_create - lookup a dentry, creating it if it doesn't exist * @nd: nameidata info * @is_dir: directory flag * * Simple function to lookup and return a dentry and create it * if it doesn't exist. Is SMP-safe. |
c663e5d80 [PATCH] add some ... |
1922 |
* |
4ac913785 Embed a struct pa... |
1923 |
* Returns with nd->path.dentry->d_inode->i_mutex locked. |
1da177e4c Linux-2.6.12-rc2 |
1924 1925 1926 |
*/ struct dentry *lookup_create(struct nameidata *nd, int is_dir) { |
c663e5d80 [PATCH] add some ... |
1927 |
struct dentry *dentry = ERR_PTR(-EEXIST); |
1da177e4c Linux-2.6.12-rc2 |
1928 |
|
4ac913785 Embed a struct pa... |
1929 |
mutex_lock_nested(&nd->path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); |
c663e5d80 [PATCH] add some ... |
1930 1931 1932 1933 |
/* * Yucky last component or no last component at all? * (foo/., foo/.., /////) */ |
1da177e4c Linux-2.6.12-rc2 |
1934 1935 1936 |
if (nd->last_type != LAST_NORM) goto fail; nd->flags &= ~LOOKUP_PARENT; |
a634904a7 VFS: add lookup h... |
1937 1938 |
nd->flags |= LOOKUP_CREATE; nd->intent.open.flags = O_EXCL; |
c663e5d80 [PATCH] add some ... |
1939 1940 1941 1942 |
/* * Do the final lookup. */ |
49705b774 [PATCH] sanitize ... |
1943 |
dentry = lookup_hash(nd); |
1da177e4c Linux-2.6.12-rc2 |
1944 1945 |
if (IS_ERR(dentry)) goto fail; |
c663e5d80 [PATCH] add some ... |
1946 |
|
e9baf6e59 [PATCH] return to... |
1947 1948 |
if (dentry->d_inode) goto eexist; |
c663e5d80 [PATCH] add some ... |
1949 1950 1951 1952 1953 1954 |
/* * 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. */ |
e9baf6e59 [PATCH] return to... |
1955 1956 1957 1958 |
if (unlikely(!is_dir && nd->last.name[nd->last.len])) { dput(dentry); dentry = ERR_PTR(-ENOENT); } |
1da177e4c Linux-2.6.12-rc2 |
1959 |
return dentry; |
e9baf6e59 [PATCH] return to... |
1960 |
eexist: |
1da177e4c Linux-2.6.12-rc2 |
1961 |
dput(dentry); |
e9baf6e59 [PATCH] return to... |
1962 |
dentry = ERR_PTR(-EEXIST); |
1da177e4c Linux-2.6.12-rc2 |
1963 1964 1965 |
fail: return dentry; } |
f81a0bffa [AF_UNIX]: Use lo... |
1966 |
EXPORT_SYMBOL_GPL(lookup_create); |
1da177e4c Linux-2.6.12-rc2 |
1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 |
int vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) { int error = may_create(dir, dentry, NULL); if (error) return error; if ((S_ISCHR(mode) || S_ISBLK(mode)) && !capable(CAP_MKNOD)) return -EPERM; if (!dir->i_op || !dir->i_op->mknod) return -EPERM; |
08ce5f16e cgroups: implemen... |
1980 1981 1982 |
error = devcgroup_inode_mknod(mode, dev); if (error) return error; |
1da177e4c Linux-2.6.12-rc2 |
1983 1984 1985 1986 1987 1988 |
error = security_inode_mknod(dir, dentry, mode, dev); if (error) return error; DQUOT_INIT(dir); error = dir->i_op->mknod(dir, dentry, mode, dev); |
a74574aaf [PATCH] Remove se... |
1989 |
if (!error) |
f38aa9422 [PATCH] Pass dent... |
1990 |
fsnotify_create(dir, dentry); |
1da177e4c Linux-2.6.12-rc2 |
1991 1992 |
return error; } |
463c31972 [PATCH] r/o bind ... |
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 |
static int may_mknod(mode_t mode) { 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; } } |
5590ff0d5 [PATCH] vfs: *at ... |
2009 2010 |
asmlinkage long sys_mknodat(int dfd, const char __user *filename, int mode, unsigned dev) |
1da177e4c Linux-2.6.12-rc2 |
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 |
{ int error = 0; char * tmp; struct dentry * dentry; struct nameidata nd; if (S_ISDIR(mode)) return -EPERM; tmp = getname(filename); if (IS_ERR(tmp)) return PTR_ERR(tmp); |
5590ff0d5 [PATCH] vfs: *at ... |
2022 |
error = do_path_lookup(dfd, tmp, LOOKUP_PARENT, &nd); |
1da177e4c Linux-2.6.12-rc2 |
2023 2024 2025 |
if (error) goto out; dentry = lookup_create(&nd, 0); |
463c31972 [PATCH] r/o bind ... |
2026 2027 2028 2029 |
if (IS_ERR(dentry)) { error = PTR_ERR(dentry); goto out_unlock; } |
4ac913785 Embed a struct pa... |
2030 |
if (!IS_POSIXACL(nd.path.dentry->d_inode)) |
1da177e4c Linux-2.6.12-rc2 |
2031 |
mode &= ~current->fs->umask; |
463c31972 [PATCH] r/o bind ... |
2032 2033 2034 2035 2036 2037 2038 |
error = may_mknod(mode); if (error) goto out_dput; error = mnt_want_write(nd.path.mnt); if (error) goto out_dput; switch (mode & S_IFMT) { |
1da177e4c Linux-2.6.12-rc2 |
2039 |
case 0: case S_IFREG: |
4ac913785 Embed a struct pa... |
2040 |
error = vfs_create(nd.path.dentry->d_inode,dentry,mode,&nd); |
1da177e4c Linux-2.6.12-rc2 |
2041 2042 |
break; case S_IFCHR: case S_IFBLK: |
4ac913785 Embed a struct pa... |
2043 |
error = vfs_mknod(nd.path.dentry->d_inode,dentry,mode, |
1da177e4c Linux-2.6.12-rc2 |
2044 2045 2046 |
new_decode_dev(dev)); break; case S_IFIFO: case S_IFSOCK: |
4ac913785 Embed a struct pa... |
2047 |
error = vfs_mknod(nd.path.dentry->d_inode,dentry,mode,0); |
1da177e4c Linux-2.6.12-rc2 |
2048 |
break; |
1da177e4c Linux-2.6.12-rc2 |
2049 |
} |
463c31972 [PATCH] r/o bind ... |
2050 2051 2052 2053 |
mnt_drop_write(nd.path.mnt); out_dput: dput(dentry); out_unlock: |
4ac913785 Embed a struct pa... |
2054 |
mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
1d957f9bf Introduce path_put() |
2055 |
path_put(&nd.path); |
1da177e4c Linux-2.6.12-rc2 |
2056 2057 2058 2059 2060 |
out: putname(tmp); return error; } |
5590ff0d5 [PATCH] vfs: *at ... |
2061 2062 2063 2064 |
asmlinkage long sys_mknod(const char __user *filename, int mode, unsigned dev) { return sys_mknodat(AT_FDCWD, filename, mode, dev); } |
1da177e4c Linux-2.6.12-rc2 |
2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 |
int vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) { int error = may_create(dir, dentry, NULL); if (error) return error; if (!dir->i_op || !dir->i_op->mkdir) return -EPERM; mode &= (S_IRWXUGO|S_ISVTX); error = security_inode_mkdir(dir, dentry, mode); if (error) return error; DQUOT_INIT(dir); error = dir->i_op->mkdir(dir, dentry, mode); |
a74574aaf [PATCH] Remove se... |
2082 |
if (!error) |
f38aa9422 [PATCH] Pass dent... |
2083 |
fsnotify_mkdir(dir, dentry); |
1da177e4c Linux-2.6.12-rc2 |
2084 2085 |
return error; } |
5590ff0d5 [PATCH] vfs: *at ... |
2086 |
asmlinkage long sys_mkdirat(int dfd, const char __user *pathname, int mode) |
1da177e4c Linux-2.6.12-rc2 |
2087 2088 2089 |
{ int error = 0; char * tmp; |
6902d925d [PATCH] r/o bind ... |
2090 2091 |
struct dentry *dentry; struct nameidata nd; |
1da177e4c Linux-2.6.12-rc2 |
2092 2093 2094 |
tmp = getname(pathname); error = PTR_ERR(tmp); |
6902d925d [PATCH] r/o bind ... |
2095 2096 |
if (IS_ERR(tmp)) goto out_err; |
1da177e4c Linux-2.6.12-rc2 |
2097 |
|
6902d925d [PATCH] r/o bind ... |
2098 2099 2100 2101 2102 2103 2104 |
error = do_path_lookup(dfd, tmp, LOOKUP_PARENT, &nd); if (error) goto out; dentry = lookup_create(&nd, 1); error = PTR_ERR(dentry); if (IS_ERR(dentry)) goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
2105 |
|
4ac913785 Embed a struct pa... |
2106 |
if (!IS_POSIXACL(nd.path.dentry->d_inode)) |
6902d925d [PATCH] r/o bind ... |
2107 |
mode &= ~current->fs->umask; |
463c31972 [PATCH] r/o bind ... |
2108 2109 2110 |
error = mnt_want_write(nd.path.mnt); if (error) goto out_dput; |
4ac913785 Embed a struct pa... |
2111 |
error = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode); |
463c31972 [PATCH] r/o bind ... |
2112 2113 |
mnt_drop_write(nd.path.mnt); out_dput: |
6902d925d [PATCH] r/o bind ... |
2114 2115 |
dput(dentry); out_unlock: |
4ac913785 Embed a struct pa... |
2116 |
mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
1d957f9bf Introduce path_put() |
2117 |
path_put(&nd.path); |
6902d925d [PATCH] r/o bind ... |
2118 2119 2120 |
out: putname(tmp); out_err: |
1da177e4c Linux-2.6.12-rc2 |
2121 2122 |
return error; } |
5590ff0d5 [PATCH] vfs: *at ... |
2123 2124 2125 2126 |
asmlinkage long sys_mkdir(const char __user *pathname, int mode) { return sys_mkdirat(AT_FDCWD, pathname, mode); } |
1da177e4c Linux-2.6.12-rc2 |
2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 |
/* * We 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. * * 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) { dget(dentry); |
dc168427e [PATCH] VFS: extr... |
2145 |
shrink_dcache_parent(dentry); |
1da177e4c Linux-2.6.12-rc2 |
2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 |
spin_lock(&dcache_lock); spin_lock(&dentry->d_lock); if (atomic_read(&dentry->d_count) == 2) __d_drop(dentry); spin_unlock(&dentry->d_lock); spin_unlock(&dcache_lock); } int vfs_rmdir(struct inode *dir, struct dentry *dentry) { int error = may_delete(dir, dentry, 1); if (error) return error; if (!dir->i_op || !dir->i_op->rmdir) return -EPERM; DQUOT_INIT(dir); |
1b1dcc1b5 [PATCH] mutex sub... |
2165 |
mutex_lock(&dentry->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 |
dentry_unhash(dentry); if (d_mountpoint(dentry)) error = -EBUSY; else { error = security_inode_rmdir(dir, dentry); if (!error) { error = dir->i_op->rmdir(dir, dentry); if (!error) dentry->d_inode->i_flags |= S_DEAD; } } |
1b1dcc1b5 [PATCH] mutex sub... |
2177 |
mutex_unlock(&dentry->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2178 |
if (!error) { |
1da177e4c Linux-2.6.12-rc2 |
2179 2180 2181 2182 2183 2184 |
d_delete(dentry); } dput(dentry); return error; } |
5590ff0d5 [PATCH] vfs: *at ... |
2185 |
static long do_rmdir(int dfd, const char __user *pathname) |
1da177e4c Linux-2.6.12-rc2 |
2186 2187 2188 2189 2190 2191 2192 2193 2194 |
{ int error = 0; char * name; struct dentry *dentry; struct nameidata nd; name = getname(pathname); if(IS_ERR(name)) return PTR_ERR(name); |
5590ff0d5 [PATCH] vfs: *at ... |
2195 |
error = do_path_lookup(dfd, name, LOOKUP_PARENT, &nd); |
1da177e4c Linux-2.6.12-rc2 |
2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 |
if (error) goto exit; switch(nd.last_type) { case LAST_DOTDOT: error = -ENOTEMPTY; goto exit1; case LAST_DOT: error = -EINVAL; goto exit1; case LAST_ROOT: error = -EBUSY; goto exit1; } |
4ac913785 Embed a struct pa... |
2210 |
mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); |
49705b774 [PATCH] sanitize ... |
2211 |
dentry = lookup_hash(&nd); |
1da177e4c Linux-2.6.12-rc2 |
2212 |
error = PTR_ERR(dentry); |
6902d925d [PATCH] r/o bind ... |
2213 2214 |
if (IS_ERR(dentry)) goto exit2; |
0622753b8 [PATCH] r/o bind ... |
2215 2216 2217 |
error = mnt_want_write(nd.path.mnt); if (error) goto exit3; |
4ac913785 Embed a struct pa... |
2218 |
error = vfs_rmdir(nd.path.dentry->d_inode, dentry); |
0622753b8 [PATCH] r/o bind ... |
2219 2220 |
mnt_drop_write(nd.path.mnt); exit3: |
6902d925d [PATCH] r/o bind ... |
2221 2222 |
dput(dentry); exit2: |
4ac913785 Embed a struct pa... |
2223 |
mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2224 |
exit1: |
1d957f9bf Introduce path_put() |
2225 |
path_put(&nd.path); |
1da177e4c Linux-2.6.12-rc2 |
2226 2227 2228 2229 |
exit: putname(name); return error; } |
5590ff0d5 [PATCH] vfs: *at ... |
2230 2231 2232 2233 |
asmlinkage long sys_rmdir(const char __user *pathname) { return do_rmdir(AT_FDCWD, pathname); } |
1da177e4c Linux-2.6.12-rc2 |
2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 |
int vfs_unlink(struct inode *dir, struct dentry *dentry) { int error = may_delete(dir, dentry, 0); if (error) return error; if (!dir->i_op || !dir->i_op->unlink) return -EPERM; DQUOT_INIT(dir); |
1b1dcc1b5 [PATCH] mutex sub... |
2245 |
mutex_lock(&dentry->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2246 2247 2248 2249 2250 2251 2252 |
if (d_mountpoint(dentry)) error = -EBUSY; else { error = security_inode_unlink(dir, dentry); if (!error) error = dir->i_op->unlink(dir, dentry); } |
1b1dcc1b5 [PATCH] mutex sub... |
2253 |
mutex_unlock(&dentry->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2254 2255 2256 |
/* We don't d_delete() NFS sillyrenamed files--they still exist. */ if (!error && !(dentry->d_flags & DCACHE_NFSFS_RENAMED)) { |
ece95912d inotify: send IN_... |
2257 |
fsnotify_link_count(dentry->d_inode); |
e234f35c5 [PATCH] inotify d... |
2258 |
d_delete(dentry); |
1da177e4c Linux-2.6.12-rc2 |
2259 |
} |
0eeca2830 [PATCH] inotify |
2260 |
|
1da177e4c Linux-2.6.12-rc2 |
2261 2262 2263 2264 2265 |
return error; } /* * Make sure that the actual truncation of the file will occur outside its |
1b1dcc1b5 [PATCH] mutex sub... |
2266 |
* directory's i_mutex. Truncate can take a long time if there is a lot of |
1da177e4c Linux-2.6.12-rc2 |
2267 2268 2269 |
* writeout happening, and we don't want to prevent access to the directory * while waiting on the I/O. */ |
5590ff0d5 [PATCH] vfs: *at ... |
2270 |
static long do_unlinkat(int dfd, const char __user *pathname) |
1da177e4c Linux-2.6.12-rc2 |
2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 |
{ int error = 0; char * name; struct dentry *dentry; struct nameidata nd; struct inode *inode = NULL; name = getname(pathname); if(IS_ERR(name)) return PTR_ERR(name); |
5590ff0d5 [PATCH] vfs: *at ... |
2281 |
error = do_path_lookup(dfd, name, LOOKUP_PARENT, &nd); |
1da177e4c Linux-2.6.12-rc2 |
2282 2283 2284 2285 2286 |
if (error) goto exit; error = -EISDIR; if (nd.last_type != LAST_NORM) goto exit1; |
4ac913785 Embed a struct pa... |
2287 |
mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); |
49705b774 [PATCH] sanitize ... |
2288 |
dentry = lookup_hash(&nd); |
1da177e4c Linux-2.6.12-rc2 |
2289 2290 2291 2292 2293 2294 2295 2296 |
error = PTR_ERR(dentry); if (!IS_ERR(dentry)) { /* Why not before? Because we want correct error value */ if (nd.last.name[nd.last.len]) goto slashes; inode = dentry->d_inode; if (inode) atomic_inc(&inode->i_count); |
0622753b8 [PATCH] r/o bind ... |
2297 2298 2299 |
error = mnt_want_write(nd.path.mnt); if (error) goto exit2; |
4ac913785 Embed a struct pa... |
2300 |
error = vfs_unlink(nd.path.dentry->d_inode, dentry); |
0622753b8 [PATCH] r/o bind ... |
2301 |
mnt_drop_write(nd.path.mnt); |
1da177e4c Linux-2.6.12-rc2 |
2302 2303 2304 |
exit2: dput(dentry); } |
4ac913785 Embed a struct pa... |
2305 |
mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2306 2307 2308 |
if (inode) iput(inode); /* truncate the inode here */ exit1: |
1d957f9bf Introduce path_put() |
2309 |
path_put(&nd.path); |
1da177e4c Linux-2.6.12-rc2 |
2310 2311 2312 2313 2314 2315 2316 2317 2318 |
exit: putname(name); return error; slashes: error = !dentry->d_inode ? -ENOENT : S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR; goto exit2; } |
5590ff0d5 [PATCH] vfs: *at ... |
2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 |
asmlinkage long sys_unlinkat(int dfd, const char __user *pathname, int flag) { if ((flag & ~AT_REMOVEDIR) != 0) return -EINVAL; if (flag & AT_REMOVEDIR) return do_rmdir(dfd, pathname); return do_unlinkat(dfd, pathname); } asmlinkage long sys_unlink(const char __user *pathname) { return do_unlinkat(AT_FDCWD, pathname); } |
1da177e4c Linux-2.6.12-rc2 |
2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 |
int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname, int mode) { int error = may_create(dir, dentry, NULL); if (error) return error; if (!dir->i_op || !dir->i_op->symlink) return -EPERM; error = security_inode_symlink(dir, dentry, oldname); if (error) return error; DQUOT_INIT(dir); error = dir->i_op->symlink(dir, dentry, oldname); |
a74574aaf [PATCH] Remove se... |
2350 |
if (!error) |
f38aa9422 [PATCH] Pass dent... |
2351 |
fsnotify_create(dir, dentry); |
1da177e4c Linux-2.6.12-rc2 |
2352 2353 |
return error; } |
5590ff0d5 [PATCH] vfs: *at ... |
2354 2355 |
asmlinkage long sys_symlinkat(const char __user *oldname, int newdfd, const char __user *newname) |
1da177e4c Linux-2.6.12-rc2 |
2356 2357 2358 2359 |
{ int error = 0; char * from; char * to; |
6902d925d [PATCH] r/o bind ... |
2360 2361 |
struct dentry *dentry; struct nameidata nd; |
1da177e4c Linux-2.6.12-rc2 |
2362 2363 2364 2365 2366 2367 |
from = getname(oldname); if(IS_ERR(from)) return PTR_ERR(from); to = getname(newname); error = PTR_ERR(to); |
6902d925d [PATCH] r/o bind ... |
2368 2369 |
if (IS_ERR(to)) goto out_putname; |
1da177e4c Linux-2.6.12-rc2 |
2370 |
|
6902d925d [PATCH] r/o bind ... |
2371 2372 2373 2374 2375 2376 2377 |
error = do_path_lookup(newdfd, to, LOOKUP_PARENT, &nd); if (error) goto out; dentry = lookup_create(&nd, 0); error = PTR_ERR(dentry); if (IS_ERR(dentry)) goto out_unlock; |
75c3f29de [PATCH] r/o bind ... |
2378 2379 2380 |
error = mnt_want_write(nd.path.mnt); if (error) goto out_dput; |
4ac913785 Embed a struct pa... |
2381 |
error = vfs_symlink(nd.path.dentry->d_inode, dentry, from, S_IALLUGO); |
75c3f29de [PATCH] r/o bind ... |
2382 2383 |
mnt_drop_write(nd.path.mnt); out_dput: |
6902d925d [PATCH] r/o bind ... |
2384 2385 |
dput(dentry); out_unlock: |
4ac913785 Embed a struct pa... |
2386 |
mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
1d957f9bf Introduce path_put() |
2387 |
path_put(&nd.path); |
1da177e4c Linux-2.6.12-rc2 |
2388 |
out: |
6902d925d [PATCH] r/o bind ... |
2389 2390 |
putname(to); out_putname: |
1da177e4c Linux-2.6.12-rc2 |
2391 2392 2393 |
putname(from); return error; } |
5590ff0d5 [PATCH] vfs: *at ... |
2394 2395 2396 2397 |
asmlinkage long sys_symlink(const char __user *oldname, const char __user *newname) { return sys_symlinkat(oldname, AT_FDCWD, newname); } |
1da177e4c Linux-2.6.12-rc2 |
2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 |
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; error = may_create(dir, new_dentry, NULL); 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; if (!dir->i_op || !dir->i_op->link) return -EPERM; if (S_ISDIR(old_dentry->d_inode->i_mode)) return -EPERM; error = security_inode_link(old_dentry, dir, new_dentry); if (error) return error; |
1b1dcc1b5 [PATCH] mutex sub... |
2426 |
mutex_lock(&old_dentry->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2427 2428 |
DQUOT_INIT(dir); error = dir->i_op->link(old_dentry, dir, new_dentry); |
1b1dcc1b5 [PATCH] mutex sub... |
2429 |
mutex_unlock(&old_dentry->d_inode->i_mutex); |
e31e14ec3 [PATCH] remove th... |
2430 |
if (!error) |
ece95912d inotify: send IN_... |
2431 |
fsnotify_link(dir, old_dentry->d_inode, new_dentry); |
1da177e4c Linux-2.6.12-rc2 |
2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 |
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 */ |
5590ff0d5 [PATCH] vfs: *at ... |
2444 |
asmlinkage long sys_linkat(int olddfd, const char __user *oldname, |
c04030e16 [PATCH] flags par... |
2445 2446 |
int newdfd, const char __user *newname, int flags) |
1da177e4c Linux-2.6.12-rc2 |
2447 2448 2449 2450 2451 |
{ struct dentry *new_dentry; struct nameidata nd, old_nd; int error; char * to; |
45c9b11a1 [PATCH] Implement... |
2452 |
if ((flags & ~AT_SYMLINK_FOLLOW) != 0) |
c04030e16 [PATCH] flags par... |
2453 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
2454 2455 2456 |
to = getname(newname); if (IS_ERR(to)) return PTR_ERR(to); |
45c9b11a1 [PATCH] Implement... |
2457 2458 2459 |
error = __user_walk_fd(olddfd, oldname, flags & AT_SYMLINK_FOLLOW ? LOOKUP_FOLLOW : 0, &old_nd); |
1da177e4c Linux-2.6.12-rc2 |
2460 2461 |
if (error) goto exit; |
5590ff0d5 [PATCH] vfs: *at ... |
2462 |
error = do_path_lookup(newdfd, to, LOOKUP_PARENT, &nd); |
1da177e4c Linux-2.6.12-rc2 |
2463 2464 2465 |
if (error) goto out; error = -EXDEV; |
4ac913785 Embed a struct pa... |
2466 |
if (old_nd.path.mnt != nd.path.mnt) |
1da177e4c Linux-2.6.12-rc2 |
2467 2468 2469 |
goto out_release; new_dentry = lookup_create(&nd, 0); error = PTR_ERR(new_dentry); |
6902d925d [PATCH] r/o bind ... |
2470 2471 |
if (IS_ERR(new_dentry)) goto out_unlock; |
75c3f29de [PATCH] r/o bind ... |
2472 2473 2474 |
error = mnt_want_write(nd.path.mnt); if (error) goto out_dput; |
4ac913785 Embed a struct pa... |
2475 |
error = vfs_link(old_nd.path.dentry, nd.path.dentry->d_inode, new_dentry); |
75c3f29de [PATCH] r/o bind ... |
2476 2477 |
mnt_drop_write(nd.path.mnt); out_dput: |
6902d925d [PATCH] r/o bind ... |
2478 2479 |
dput(new_dentry); out_unlock: |
4ac913785 Embed a struct pa... |
2480 |
mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2481 |
out_release: |
1d957f9bf Introduce path_put() |
2482 |
path_put(&nd.path); |
1da177e4c Linux-2.6.12-rc2 |
2483 |
out: |
1d957f9bf Introduce path_put() |
2484 |
path_put(&old_nd.path); |
1da177e4c Linux-2.6.12-rc2 |
2485 2486 2487 2488 2489 |
exit: putname(to); return error; } |
5590ff0d5 [PATCH] vfs: *at ... |
2490 2491 |
asmlinkage long sys_link(const char __user *oldname, const char __user *newname) { |
c04030e16 [PATCH] flags par... |
2492 |
return sys_linkat(AT_FDCWD, oldname, AT_FDCWD, newname, 0); |
5590ff0d5 [PATCH] vfs: *at ... |
2493 |
} |
1da177e4c Linux-2.6.12-rc2 |
2494 2495 2496 2497 2498 2499 2500 |
/* * 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... |
2501 |
* sb->s_vfs_rename_mutex. We might be more accurate, but that's another |
1da177e4c Linux-2.6.12-rc2 |
2502 2503 |
* story. * c) we have to lock _three_ objects - parents and victim (if it exists). |
1b1dcc1b5 [PATCH] mutex sub... |
2504 |
* And that - after we got ->i_mutex on parents (until then we don't know |
1da177e4c Linux-2.6.12-rc2 |
2505 2506 |
* 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... |
2507 |
* only under ->s_vfs_rename_mutex _and_ that parent of the object we |
1da177e4c Linux-2.6.12-rc2 |
2508 2509 2510 |
* 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... |
2511 |
* lock child" and rename is under ->s_vfs_rename_mutex. |
1da177e4c Linux-2.6.12-rc2 |
2512 2513 2514 2515 2516 2517 2518 2519 2520 |
* 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. * d) some filesystems don't support opened-but-unlinked directories, * either because of layout or because they are not ready to deal with * all cases correctly. The latter will be fixed (taking this sort of * stuff into VFS), but the former is not going away. Solution: the same * trick as in rmdir(). * e) conversion from fhandle to dentry may come in the wrong moment - when |
1b1dcc1b5 [PATCH] mutex sub... |
2521 |
* we are removing the target. Solution: we will have to grab ->i_mutex |
1da177e4c Linux-2.6.12-rc2 |
2522 |
* in the fhandle_to_dentry code. [FIXME - current nfsfh.c relies on |
1b1dcc1b5 [PATCH] mutex sub... |
2523 |
* ->i_mutex on parents, which works but leads to some truely excessive |
1da177e4c Linux-2.6.12-rc2 |
2524 2525 |
* locking]. */ |
75c96f858 [PATCH] make some... |
2526 2527 |
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 |
2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 |
{ int error = 0; struct inode *target; /* * If we are going to change the parent - check write permissions, * we'll need to flip '..'. */ if (new_dir != old_dir) { error = permission(old_dentry->d_inode, MAY_WRITE, NULL); if (error) return error; } error = security_inode_rename(old_dir, old_dentry, new_dir, new_dentry); if (error) return error; target = new_dentry->d_inode; if (target) { |
1b1dcc1b5 [PATCH] mutex sub... |
2548 |
mutex_lock(&target->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2549 2550 2551 2552 2553 2554 2555 2556 2557 |
dentry_unhash(new_dentry); } if (d_mountpoint(old_dentry)||d_mountpoint(new_dentry)) error = -EBUSY; else error = old_dir->i_op->rename(old_dir, old_dentry, new_dir, new_dentry); if (target) { if (!error) target->i_flags |= S_DEAD; |
1b1dcc1b5 [PATCH] mutex sub... |
2558 |
mutex_unlock(&target->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2559 2560 2561 2562 |
if (d_unhashed(new_dentry)) d_rehash(new_dentry); dput(new_dentry); } |
e31e14ec3 [PATCH] remove th... |
2563 |
if (!error) |
349457ccf [PATCH] Allow fil... |
2564 2565 |
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 |
2566 2567 |
return error; } |
75c96f858 [PATCH] make some... |
2568 2569 |
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 |
2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 |
{ struct inode *target; int error; error = security_inode_rename(old_dir, old_dentry, new_dir, new_dentry); if (error) return error; dget(new_dentry); target = new_dentry->d_inode; if (target) |
1b1dcc1b5 [PATCH] mutex sub... |
2581 |
mutex_lock(&target->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2582 2583 2584 2585 2586 |
if (d_mountpoint(old_dentry)||d_mountpoint(new_dentry)) error = -EBUSY; else error = old_dir->i_op->rename(old_dir, old_dentry, new_dir, new_dentry); if (!error) { |
349457ccf [PATCH] Allow fil... |
2587 |
if (!(old_dir->i_sb->s_type->fs_flags & FS_RENAME_DOES_D_MOVE)) |
1da177e4c Linux-2.6.12-rc2 |
2588 |
d_move(old_dentry, new_dentry); |
1da177e4c Linux-2.6.12-rc2 |
2589 2590 |
} if (target) |
1b1dcc1b5 [PATCH] mutex sub... |
2591 |
mutex_unlock(&target->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
2592 2593 2594 2595 2596 2597 2598 2599 2600 |
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); |
0eeca2830 [PATCH] inotify |
2601 |
const char *old_name; |
1da177e4c Linux-2.6.12-rc2 |
2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 |
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) error = may_create(new_dir, new_dentry, NULL); else error = may_delete(new_dir, new_dentry, is_dir); if (error) return error; if (!old_dir->i_op || !old_dir->i_op->rename) return -EPERM; DQUOT_INIT(old_dir); DQUOT_INIT(new_dir); |
0eeca2830 [PATCH] inotify |
2622 |
old_name = fsnotify_oldname_init(old_dentry->d_name.name); |
1da177e4c Linux-2.6.12-rc2 |
2623 2624 2625 2626 2627 |
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); if (!error) { |
0eeca2830 [PATCH] inotify |
2628 |
const char *new_name = old_dentry->d_name.name; |
89204c40a [PATCH] inotify: ... |
2629 |
fsnotify_move(old_dir, new_dir, old_name, new_name, is_dir, |
5a190ae69 [PATCH] pass dent... |
2630 |
new_dentry->d_inode, old_dentry); |
1da177e4c Linux-2.6.12-rc2 |
2631 |
} |
0eeca2830 [PATCH] inotify |
2632 |
fsnotify_oldname_free(old_name); |
1da177e4c Linux-2.6.12-rc2 |
2633 2634 |
return error; } |
5590ff0d5 [PATCH] vfs: *at ... |
2635 2636 |
static int do_rename(int olddfd, const char *oldname, int newdfd, const char *newname) |
1da177e4c Linux-2.6.12-rc2 |
2637 2638 2639 2640 2641 2642 |
{ int error = 0; struct dentry * old_dir, * new_dir; struct dentry * old_dentry, *new_dentry; struct dentry * trap; struct nameidata oldnd, newnd; |
5590ff0d5 [PATCH] vfs: *at ... |
2643 |
error = do_path_lookup(olddfd, oldname, LOOKUP_PARENT, &oldnd); |
1da177e4c Linux-2.6.12-rc2 |
2644 2645 |
if (error) goto exit; |
5590ff0d5 [PATCH] vfs: *at ... |
2646 |
error = do_path_lookup(newdfd, newname, LOOKUP_PARENT, &newnd); |
1da177e4c Linux-2.6.12-rc2 |
2647 2648 2649 2650 |
if (error) goto exit1; error = -EXDEV; |
4ac913785 Embed a struct pa... |
2651 |
if (oldnd.path.mnt != newnd.path.mnt) |
1da177e4c Linux-2.6.12-rc2 |
2652 |
goto exit2; |
4ac913785 Embed a struct pa... |
2653 |
old_dir = oldnd.path.dentry; |
1da177e4c Linux-2.6.12-rc2 |
2654 2655 2656 |
error = -EBUSY; if (oldnd.last_type != LAST_NORM) goto exit2; |
4ac913785 Embed a struct pa... |
2657 |
new_dir = newnd.path.dentry; |
1da177e4c Linux-2.6.12-rc2 |
2658 2659 2660 2661 |
if (newnd.last_type != LAST_NORM) goto exit2; trap = lock_rename(new_dir, old_dir); |
49705b774 [PATCH] sanitize ... |
2662 |
old_dentry = lookup_hash(&oldnd); |
1da177e4c Linux-2.6.12-rc2 |
2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 |
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 ... |
2682 |
new_dentry = lookup_hash(&newnd); |
1da177e4c Linux-2.6.12-rc2 |
2683 2684 2685 2686 2687 2688 2689 |
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 ... |
2690 2691 2692 |
error = mnt_want_write(oldnd.path.mnt); if (error) goto exit5; |
1da177e4c Linux-2.6.12-rc2 |
2693 2694 |
error = vfs_rename(old_dir->d_inode, old_dentry, new_dir->d_inode, new_dentry); |
9079b1eb1 [PATCH] r/o bind ... |
2695 |
mnt_drop_write(oldnd.path.mnt); |
1da177e4c Linux-2.6.12-rc2 |
2696 2697 2698 2699 2700 2701 2702 |
exit5: dput(new_dentry); exit4: dput(old_dentry); exit3: unlock_rename(new_dir, old_dir); exit2: |
1d957f9bf Introduce path_put() |
2703 |
path_put(&newnd.path); |
1da177e4c Linux-2.6.12-rc2 |
2704 |
exit1: |
1d957f9bf Introduce path_put() |
2705 |
path_put(&oldnd.path); |
1da177e4c Linux-2.6.12-rc2 |
2706 2707 2708 |
exit: return error; } |
5590ff0d5 [PATCH] vfs: *at ... |
2709 2710 |
asmlinkage long sys_renameat(int olddfd, const char __user *oldname, int newdfd, const char __user *newname) |
1da177e4c Linux-2.6.12-rc2 |
2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 |
{ int error; char * from; char * to; from = getname(oldname); if(IS_ERR(from)) return PTR_ERR(from); to = getname(newname); error = PTR_ERR(to); if (!IS_ERR(to)) { |
5590ff0d5 [PATCH] vfs: *at ... |
2722 |
error = do_rename(olddfd, from, newdfd, to); |
1da177e4c Linux-2.6.12-rc2 |
2723 2724 2725 2726 2727 |
putname(to); } putname(from); return error; } |
5590ff0d5 [PATCH] vfs: *at ... |
2728 2729 2730 2731 |
asmlinkage long sys_rename(const char __user *oldname, const char __user *newname) { return sys_renameat(AT_FDCWD, oldname, AT_FDCWD, newname); } |
1da177e4c Linux-2.6.12-rc2 |
2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 |
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... |
2757 |
void *cookie; |
1da177e4c Linux-2.6.12-rc2 |
2758 |
nd.depth = 0; |
cc314eef0 Fix nasty ncpfs s... |
2759 2760 2761 |
cookie = dentry->d_inode->i_op->follow_link(dentry, &nd); if (!IS_ERR(cookie)) { int res = vfs_readlink(dentry, buffer, buflen, nd_get_link(&nd)); |
1da177e4c Linux-2.6.12-rc2 |
2762 |
if (dentry->d_inode->i_op->put_link) |
cc314eef0 Fix nasty ncpfs s... |
2763 2764 |
dentry->d_inode->i_op->put_link(dentry, &nd, cookie); cookie = ERR_PTR(res); |
1da177e4c Linux-2.6.12-rc2 |
2765 |
} |
cc314eef0 Fix nasty ncpfs s... |
2766 |
return PTR_ERR(cookie); |
1da177e4c Linux-2.6.12-rc2 |
2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 |
} 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) { struct page * page; struct address_space *mapping = dentry->d_inode->i_mapping; |
090d2b185 [PATCH] read_mapp... |
2779 |
page = read_mapping_page(mapping, 0, NULL); |
1da177e4c Linux-2.6.12-rc2 |
2780 |
if (IS_ERR(page)) |
6fe6900e1 mm: make read_cac... |
2781 |
return (char*)page; |
1da177e4c Linux-2.6.12-rc2 |
2782 2783 |
*ppage = page; return kmap(page); |
1da177e4c Linux-2.6.12-rc2 |
2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 |
} 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... |
2797 |
void *page_follow_link_light(struct dentry *dentry, struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
2798 |
{ |
cc314eef0 Fix nasty ncpfs s... |
2799 |
struct page *page = NULL; |
1da177e4c Linux-2.6.12-rc2 |
2800 |
nd_set_link(nd, page_getlink(dentry, &page)); |
cc314eef0 Fix nasty ncpfs s... |
2801 |
return page; |
1da177e4c Linux-2.6.12-rc2 |
2802 |
} |
cc314eef0 Fix nasty ncpfs s... |
2803 |
void page_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie) |
1da177e4c Linux-2.6.12-rc2 |
2804 |
{ |
cc314eef0 Fix nasty ncpfs s... |
2805 2806 2807 |
struct page *page = cookie; if (page) { |
1da177e4c Linux-2.6.12-rc2 |
2808 2809 |
kunmap(page); page_cache_release(page); |
1da177e4c Linux-2.6.12-rc2 |
2810 2811 |
} } |
0adb25d2e [PATCH] ext3: ext... |
2812 2813 |
int __page_symlink(struct inode *inode, const char *symname, int len, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
2814 2815 |
{ struct address_space *mapping = inode->i_mapping; |
0adb25d2e [PATCH] ext3: ext... |
2816 |
struct page *page; |
afddba49d fs: introduce wri... |
2817 |
void *fsdata; |
beb497ab4 [PATCH] __page_sy... |
2818 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
2819 |
char *kaddr; |
7e53cac41 [PATCH] Honour AO... |
2820 |
retry: |
afddba49d fs: introduce wri... |
2821 2822 |
err = pagecache_write_begin(NULL, mapping, 0, len-1, AOP_FLAG_UNINTERRUPTIBLE, &page, &fsdata); |
1da177e4c Linux-2.6.12-rc2 |
2823 |
if (err) |
afddba49d fs: introduce wri... |
2824 |
goto fail; |
1da177e4c Linux-2.6.12-rc2 |
2825 2826 2827 |
kaddr = kmap_atomic(page, KM_USER0); memcpy(kaddr, symname, len-1); kunmap_atomic(kaddr, KM_USER0); |
afddba49d fs: introduce wri... |
2828 2829 2830 |
err = pagecache_write_end(NULL, mapping, 0, len-1, len-1, page, fsdata); |
1da177e4c Linux-2.6.12-rc2 |
2831 2832 |
if (err < 0) goto fail; |
afddba49d fs: introduce wri... |
2833 2834 |
if (err < len-1) goto retry; |
1da177e4c Linux-2.6.12-rc2 |
2835 2836 |
mark_inode_dirty(inode); return 0; |
1da177e4c Linux-2.6.12-rc2 |
2837 2838 2839 |
fail: return err; } |
0adb25d2e [PATCH] ext3: ext... |
2840 2841 2842 2843 2844 |
int page_symlink(struct inode *inode, const char *symname, int len) { return __page_symlink(inode, symname, len, mapping_gfp_mask(inode->i_mapping)); } |
92e1d5be9 [PATCH] mark stru... |
2845 |
const struct inode_operations page_symlink_inode_operations = { |
1da177e4c Linux-2.6.12-rc2 |
2846 2847 2848 2849 2850 2851 |
.readlink = generic_readlink, .follow_link = page_follow_link_light, .put_link = page_put_link, }; EXPORT_SYMBOL(__user_walk); |
5590ff0d5 [PATCH] vfs: *at ... |
2852 |
EXPORT_SYMBOL(__user_walk_fd); |
1da177e4c Linux-2.6.12-rc2 |
2853 2854 2855 2856 2857 |
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 |
2858 2859 2860 2861 |
EXPORT_SYMBOL(lookup_one_len); EXPORT_SYMBOL(page_follow_link_light); EXPORT_SYMBOL(page_put_link); EXPORT_SYMBOL(page_readlink); |
0adb25d2e [PATCH] ext3: ext... |
2862 |
EXPORT_SYMBOL(__page_symlink); |
1da177e4c Linux-2.6.12-rc2 |
2863 2864 2865 |
EXPORT_SYMBOL(page_symlink); EXPORT_SYMBOL(page_symlink_inode_operations); EXPORT_SYMBOL(path_lookup); |
16f182002 fs: introduce vfs... |
2866 |
EXPORT_SYMBOL(vfs_path_lookup); |
1da177e4c Linux-2.6.12-rc2 |
2867 |
EXPORT_SYMBOL(permission); |
e4543eddf [PATCH] add a vfs... |
2868 |
EXPORT_SYMBOL(vfs_permission); |
8c744fb83 [PATCH] add a fil... |
2869 |
EXPORT_SYMBOL(file_permission); |
1da177e4c Linux-2.6.12-rc2 |
2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 |
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); |