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fs/overlayfs/dir.c
28 KB
d2912cb15 treewide: Replace... |
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// SPDX-License-Identifier: GPL-2.0-only |
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/* * * Copyright (C) 2011 Novell Inc. |
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*/ #include <linux/fs.h> #include <linux/namei.h> #include <linux/xattr.h> #include <linux/security.h> #include <linux/cred.h> |
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#include <linux/module.h> |
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#include <linux/posix_acl.h> #include <linux/posix_acl_xattr.h> |
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#include <linux/atomic.h> |
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#include <linux/ratelimit.h> |
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#include "overlayfs.h" |
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static unsigned short ovl_redirect_max = 256; module_param_named(redirect_max, ovl_redirect_max, ushort, 0644); |
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MODULE_PARM_DESC(redirect_max, |
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"Maximum length of absolute redirect xattr value"); |
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static int ovl_set_redirect(struct dentry *dentry, bool samedir); |
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int ovl_cleanup(struct inode *wdir, struct dentry *wdentry) |
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{ int err; dget(wdentry); |
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if (d_is_dir(wdentry)) |
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err = ovl_do_rmdir(wdir, wdentry); else err = ovl_do_unlink(wdir, wdentry); dput(wdentry); if (err) { pr_err("overlayfs: cleanup of '%pd2' failed (%i) ", wdentry, err); } |
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return err; |
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} |
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static struct dentry *ovl_lookup_temp(struct dentry *workdir) |
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{ struct dentry *temp; char name[20]; |
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static atomic_t temp_id = ATOMIC_INIT(0); |
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|
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/* counter is allowed to wrap, since temp dentries are ephemeral */ snprintf(name, sizeof(name), "#%x", atomic_inc_return(&temp_id)); |
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temp = lookup_one_len(name, workdir, strlen(name)); if (!IS_ERR(temp) && temp->d_inode) { pr_err("overlayfs: workdir/%s already exists ", name); dput(temp); temp = ERR_PTR(-EIO); } return temp; } /* caller holds i_mutex on workdir */ |
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static struct dentry *ovl_whiteout(struct dentry *workdir) |
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{ int err; struct dentry *whiteout; struct inode *wdir = workdir->d_inode; |
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whiteout = ovl_lookup_temp(workdir); |
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if (IS_ERR(whiteout)) return whiteout; err = ovl_do_whiteout(wdir, whiteout); if (err) { dput(whiteout); whiteout = ERR_PTR(err); } return whiteout; } |
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/* Caller must hold i_mutex on both workdir and dir */ int ovl_cleanup_and_whiteout(struct dentry *workdir, struct inode *dir, struct dentry *dentry) { struct inode *wdir = workdir->d_inode; struct dentry *whiteout; int err; int flags = 0; whiteout = ovl_whiteout(workdir); err = PTR_ERR(whiteout); if (IS_ERR(whiteout)) return err; if (d_is_dir(dentry)) flags = RENAME_EXCHANGE; err = ovl_do_rename(wdir, whiteout, dir, dentry, flags); if (err) goto kill_whiteout; if (flags) ovl_cleanup(wdir, dentry); out: dput(whiteout); return err; kill_whiteout: ovl_cleanup(wdir, whiteout); goto out; } |
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static int ovl_mkdir_real(struct inode *dir, struct dentry **newdentry, umode_t mode) { int err; struct dentry *d, *dentry = *newdentry; err = ovl_do_mkdir(dir, dentry, mode); if (err) return err; if (likely(!d_unhashed(dentry))) return 0; /* * vfs_mkdir() may succeed and leave the dentry passed * to it unhashed and negative. If that happens, try to * lookup a new hashed and positive dentry. */ d = lookup_one_len(dentry->d_name.name, dentry->d_parent, dentry->d_name.len); if (IS_ERR(d)) { pr_warn("overlayfs: failed lookup after mkdir (%pd2, err=%i). ", dentry, err); return PTR_ERR(d); } dput(dentry); *newdentry = d; return 0; } |
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struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, struct ovl_cattr *attr) |
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{ int err; |
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if (IS_ERR(newdentry)) return newdentry; err = -ESTALE; |
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if (newdentry->d_inode) |
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goto out; |
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|
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if (attr->hardlink) { err = ovl_do_link(attr->hardlink, dir, newdentry); |
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} else { |
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switch (attr->mode & S_IFMT) { |
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case S_IFREG: |
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err = ovl_do_create(dir, newdentry, attr->mode); |
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break; case S_IFDIR: |
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/* mkdir is special... */ err = ovl_mkdir_real(dir, &newdentry, attr->mode); |
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break; case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK: |
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err = ovl_do_mknod(dir, newdentry, attr->mode, attr->rdev); |
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break; case S_IFLNK: |
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err = ovl_do_symlink(dir, newdentry, attr->link); |
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break; default: err = -EPERM; } } if (!err && WARN_ON(!newdentry->d_inode)) { /* * Not quite sure if non-instantiated dentry is legal or not. * VFS doesn't seem to care so check and warn here. */ |
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err = -EIO; |
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} |
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out: if (err) { dput(newdentry); return ERR_PTR(err); } return newdentry; |
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} |
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struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr) { return ovl_create_real(d_inode(workdir), ovl_lookup_temp(workdir), attr); } |
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static int ovl_set_opaque_xerr(struct dentry *dentry, struct dentry *upper, int xerr) |
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{ |
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int err; |
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err = ovl_check_setxattr(dentry, upper, OVL_XATTR_OPAQUE, "y", 1, xerr); |
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if (!err) ovl_dentry_set_opaque(dentry); return err; |
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} |
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static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry) { /* * Fail with -EIO when trying to create opaque dir and upper doesn't * support xattrs. ovl_rename() calls ovl_set_opaque_xerr(-EXDEV) to * return a specific error for noxattr case. */ return ovl_set_opaque_xerr(dentry, upperdentry, -EIO); } |
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/* * Common operations required to be done after creation of file on upper. * If @hardlink is false, then @inode is a pre-allocated inode, we may or * may not use to instantiate the new dentry. */ static int ovl_instantiate(struct dentry *dentry, struct inode *inode, struct dentry *newdentry, bool hardlink) |
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{ |
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struct ovl_inode_params oip = { .upperdentry = newdentry, .newinode = inode, }; |
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ovl_dir_modified(dentry->d_parent, false); |
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ovl_dentry_set_upper_alias(dentry); |
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if (!hardlink) { |
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/* * ovl_obtain_alias() can be called after ovl_create_real() * and before we get here, so we may get an inode from cache * with the same real upperdentry that is not the inode we * pre-allocated. In this case we will use the cached inode * to instantiate the new dentry. * * XXX: if we ever use ovl_obtain_alias() to decode directory * file handles, need to use ovl_get_inode_locked() and * d_instantiate_new() here to prevent from creating two * hashed directory inode aliases. */ inode = ovl_get_inode(dentry->d_sb, &oip); |
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if (IS_ERR(inode)) |
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return PTR_ERR(inode); |
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} else { |
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WARN_ON(ovl_inode_real(inode) != d_inode(newdentry)); dput(newdentry); |
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inc_nlink(inode); } |
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|
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d_instantiate(dentry, inode); |
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if (inode != oip.newinode) { pr_warn_ratelimited("overlayfs: newly created inode found in cache (%pd2) ", dentry); } |
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/* Force lookup of new upper hardlink to find its lower */ if (hardlink) d_drop(dentry); |
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return 0; |
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} |
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static bool ovl_type_merge(struct dentry *dentry) { return OVL_TYPE_MERGE(ovl_path_type(dentry)); } |
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static bool ovl_type_origin(struct dentry *dentry) { return OVL_TYPE_ORIGIN(ovl_path_type(dentry)); } |
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static int ovl_create_upper(struct dentry *dentry, struct inode *inode, |
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struct ovl_cattr *attr) |
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{ struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); struct inode *udir = upperdir->d_inode; struct dentry *newdentry; int err; |
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if (!attr->hardlink && !IS_POSIXACL(udir)) |
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attr->mode &= ~current_umask(); |
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|
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inode_lock_nested(udir, I_MUTEX_PARENT); |
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newdentry = ovl_create_real(udir, lookup_one_len(dentry->d_name.name, upperdir, dentry->d_name.len), attr); |
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err = PTR_ERR(newdentry); if (IS_ERR(newdentry)) goto out_unlock; |
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|
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if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) { |
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/* Setting opaque here is just an optimization, allow to fail */ ovl_set_opaque(dentry, newdentry); } |
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err = ovl_instantiate(dentry, inode, newdentry, !!attr->hardlink); if (err) goto out_cleanup; |
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out_unlock: |
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inode_unlock(udir); |
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return err; |
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out_cleanup: ovl_cleanup(udir, newdentry); dput(newdentry); goto out_unlock; |
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} |
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static struct dentry *ovl_clear_empty(struct dentry *dentry, struct list_head *list) { struct dentry *workdir = ovl_workdir(dentry); struct inode *wdir = workdir->d_inode; struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); struct inode *udir = upperdir->d_inode; struct path upperpath; struct dentry *upper; struct dentry *opaquedir; struct kstat stat; int err; |
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if (WARN_ON(!workdir)) return ERR_PTR(-EROFS); |
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err = ovl_lock_rename_workdir(workdir, upperdir); if (err) goto out; ovl_path_upper(dentry, &upperpath); |
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err = vfs_getattr(&upperpath, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); |
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if (err) goto out_unlock; err = -ESTALE; if (!S_ISDIR(stat.mode)) goto out_unlock; upper = upperpath.dentry; if (upper->d_parent->d_inode != udir) goto out_unlock; |
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opaquedir = ovl_create_temp(workdir, OVL_CATTR(stat.mode)); |
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err = PTR_ERR(opaquedir); if (IS_ERR(opaquedir)) goto out_unlock; |
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err = ovl_copy_xattr(upper, opaquedir); if (err) goto out_cleanup; |
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err = ovl_set_opaque(dentry, opaquedir); |
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if (err) goto out_cleanup; |
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inode_lock(opaquedir->d_inode); |
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err = ovl_set_attr(opaquedir, &stat); |
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inode_unlock(opaquedir->d_inode); |
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if (err) goto out_cleanup; err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE); if (err) goto out_cleanup; ovl_cleanup_whiteouts(upper, list); ovl_cleanup(wdir, upper); unlock_rename(workdir, upperdir); /* dentry's upper doesn't match now, get rid of it */ d_drop(dentry); return opaquedir; out_cleanup: ovl_cleanup(wdir, opaquedir); |
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dput(opaquedir); out_unlock: unlock_rename(workdir, upperdir); out: return ERR_PTR(err); } |
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static int ovl_set_upper_acl(struct dentry *upperdentry, const char *name, const struct posix_acl *acl) { void *buffer; size_t size; int err; if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl) return 0; |
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size = posix_acl_xattr_size(acl->a_count); |
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buffer = kmalloc(size, GFP_KERNEL); if (!buffer) return -ENOMEM; |
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err = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); |
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if (err < 0) goto out_free; err = vfs_setxattr(upperdentry, name, buffer, size, XATTR_CREATE); out_free: kfree(buffer); return err; } |
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static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode, |
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struct ovl_cattr *cattr) |
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{ struct dentry *workdir = ovl_workdir(dentry); struct inode *wdir = workdir->d_inode; struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); struct inode *udir = upperdir->d_inode; struct dentry *upper; struct dentry *newdentry; int err; |
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struct posix_acl *acl, *default_acl; |
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bool hardlink = !!cattr->hardlink; |
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|
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if (WARN_ON(!workdir)) return -EROFS; |
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if (!hardlink) { err = posix_acl_create(dentry->d_parent->d_inode, |
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&cattr->mode, &default_acl, &acl); |
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if (err) return err; } |
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err = ovl_lock_rename_workdir(workdir, upperdir); if (err) goto out; |
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upper = lookup_one_len(dentry->d_name.name, upperdir, dentry->d_name.len); err = PTR_ERR(upper); if (IS_ERR(upper)) |
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goto out_unlock; |
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|
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err = -ESTALE; if (d_is_negative(upper) || !IS_WHITEOUT(d_inode(upper))) goto out_dput; |
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newdentry = ovl_create_temp(workdir, cattr); |
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err = PTR_ERR(newdentry); if (IS_ERR(newdentry)) goto out_dput; |
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|
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/* * mode could have been mutilated due to umask (e.g. sgid directory) */ |
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if (!hardlink && |
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!S_ISLNK(cattr->mode) && newdentry->d_inode->i_mode != cattr->mode) { |
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struct iattr attr = { .ia_valid = ATTR_MODE, |
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.ia_mode = cattr->mode, |
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}; inode_lock(newdentry->d_inode); err = notify_change(newdentry, &attr, NULL); inode_unlock(newdentry->d_inode); if (err) goto out_cleanup; } |
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if (!hardlink) { err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_ACCESS, acl); if (err) goto out_cleanup; err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_DEFAULT, default_acl); if (err) goto out_cleanup; } |
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|
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if (!hardlink && S_ISDIR(cattr->mode)) { |
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err = ovl_set_opaque(dentry, newdentry); |
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if (err) goto out_cleanup; err = ovl_do_rename(wdir, newdentry, udir, upper, RENAME_EXCHANGE); if (err) goto out_cleanup; ovl_cleanup(wdir, upper); } else { err = ovl_do_rename(wdir, newdentry, udir, upper, 0); if (err) goto out_cleanup; } |
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err = ovl_instantiate(dentry, inode, newdentry, hardlink); if (err) goto out_cleanup; |
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out_dput: |
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dput(upper); |
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out_unlock: unlock_rename(workdir, upperdir); out: |
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if (!hardlink) { posix_acl_release(acl); posix_acl_release(default_acl); } |
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return err; out_cleanup: ovl_cleanup(wdir, newdentry); |
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dput(newdentry); goto out_dput; |
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} |
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static int ovl_create_or_link(struct dentry *dentry, struct inode *inode, |
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struct ovl_cattr *attr, bool origin) |
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{ int err; |
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const struct cred *old_cred; struct cred *override_cred; |
ea3dad18d ovl: mark parent ... |
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struct dentry *parent = dentry->d_parent; |
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|
ea3dad18d ovl: mark parent ... |
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err = ovl_copy_up(parent); |
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if (err) |
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return err; |
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|
1175b6b8d ovl: do operation... |
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old_cred = ovl_override_creds(dentry->d_sb); |
ea3dad18d ovl: mark parent ... |
515 516 517 518 519 520 521 522 523 524 |
/* * When linking a file with copy up origin into a new parent, mark the * new parent dir "impure". */ if (origin) { err = ovl_set_impure(parent, ovl_dentry_upper(parent)); if (err) goto out_revert_creds; } |
1175b6b8d ovl: do operation... |
525 526 527 |
err = -ENOMEM; override_cred = prepare_creds(); if (override_cred) { |
bb0d2b8ad ovl: fix sgid on ... |
528 529 |
override_cred->fsuid = inode->i_uid; override_cred->fsgid = inode->i_gid; |
471ec5dcf ovl: struct cattr... |
530 |
if (!attr->hardlink) { |
2602625b7 security, overlay... |
531 |
err = security_dentry_create_files_as(dentry, |
32a3d848e ovl: clean up kst... |
532 |
attr->mode, &dentry->d_name, old_cred, |
2602625b7 security, overlay... |
533 534 535 536 537 538 |
override_cred); if (err) { put_cred(override_cred); goto out_revert_creds; } } |
1175b6b8d ovl: do operation... |
539 540 |
put_cred(override_creds(override_cred)); put_cred(override_cred); |
c412ce498 ovl: add ovl_dent... |
541 |
if (!ovl_dentry_is_whiteout(dentry)) |
471ec5dcf ovl: struct cattr... |
542 |
err = ovl_create_upper(dentry, inode, attr); |
1175b6b8d ovl: do operation... |
543 |
else |
471ec5dcf ovl: struct cattr... |
544 |
err = ovl_create_over_whiteout(dentry, inode, attr); |
e9be9d5e7 overlay filesystem |
545 |
} |
2602625b7 security, overlay... |
546 |
out_revert_creds: |
1175b6b8d ovl: do operation... |
547 |
revert_creds(old_cred); |
e9be9d5e7 overlay filesystem |
548 549 550 551 552 553 554 |
return err; } static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev, const char *link) { int err; |
51f7e52dc ovl: share inode ... |
555 |
struct inode *inode; |
471ec5dcf ovl: struct cattr... |
556 |
struct ovl_cattr attr = { |
51f7e52dc ovl: share inode ... |
557 |
.rdev = rdev, |
32a3d848e ovl: clean up kst... |
558 |
.link = link, |
51f7e52dc ovl: share inode ... |
559 |
}; |
e9be9d5e7 overlay filesystem |
560 561 |
err = ovl_want_write(dentry); |
51f7e52dc ovl: share inode ... |
562 563 |
if (err) goto out; |
01b39dcc9 ovl: use inode_in... |
564 |
/* Preallocate inode to be used by ovl_get_inode() */ |
51f7e52dc ovl: share inode ... |
565 |
err = -ENOMEM; |
ca4c8a3a8 ovl: treat specia... |
566 |
inode = ovl_new_inode(dentry->d_sb, mode, rdev); |
51f7e52dc ovl: share inode ... |
567 568 |
if (!inode) goto out_drop_write; |
6faf05c2b ovl: set I_CREATI... |
569 570 571 |
spin_lock(&inode->i_lock); inode->i_state |= I_CREATING; spin_unlock(&inode->i_lock); |
51f7e52dc ovl: share inode ... |
572 |
inode_init_owner(inode, dentry->d_parent->d_inode, mode); |
32a3d848e ovl: clean up kst... |
573 |
attr.mode = inode->i_mode; |
51f7e52dc ovl: share inode ... |
574 |
|
471ec5dcf ovl: struct cattr... |
575 |
err = ovl_create_or_link(dentry, inode, &attr, false); |
01b39dcc9 ovl: use inode_in... |
576 577 |
/* Did we end up using the preallocated inode? */ if (inode != d_inode(dentry)) |
51f7e52dc ovl: share inode ... |
578 |
iput(inode); |
e9be9d5e7 overlay filesystem |
579 |
|
51f7e52dc ovl: share inode ... |
580 581 582 |
out_drop_write: ovl_drop_write(dentry); out: |
e9be9d5e7 overlay filesystem |
583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 |
return err; } static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) { return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL); } static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) { return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL); } static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) { /* Don't allow creation of "whiteout" on overlay */ if (S_ISCHR(mode) && rdev == WHITEOUT_DEV) return -EPERM; return ovl_create_object(dentry, mode, rdev, NULL); } static int ovl_symlink(struct inode *dir, struct dentry *dentry, const char *link) { return ovl_create_object(dentry, S_IFLNK, 0, link); } |
91ff20f34 ovl: fix missing ... |
612 613 614 615 616 617 618 619 620 621 622 |
static int ovl_set_link_redirect(struct dentry *dentry) { const struct cred *old_cred; int err; old_cred = ovl_override_creds(dentry->d_sb); err = ovl_set_redirect(dentry, false); revert_creds(old_cred); return err; } |
e9be9d5e7 overlay filesystem |
623 624 625 626 |
static int ovl_link(struct dentry *old, struct inode *newdir, struct dentry *new) { int err; |
51f7e52dc ovl: share inode ... |
627 |
struct inode *inode; |
e9be9d5e7 overlay filesystem |
628 629 630 631 632 633 634 635 |
err = ovl_want_write(old); if (err) goto out; err = ovl_copy_up(old); if (err) goto out_drop_write; |
6cd078702 ovl: fix recursiv... |
636 637 638 |
err = ovl_copy_up(new->d_parent); if (err) goto out_drop_write; |
4120fe64d ovl: Set redirect... |
639 |
if (ovl_is_metacopy_dentry(old)) { |
91ff20f34 ovl: fix missing ... |
640 |
err = ovl_set_link_redirect(old); |
4120fe64d ovl: Set redirect... |
641 642 643 |
if (err) goto out_drop_write; } |
0e32992f7 ovl: remove the '... |
644 |
err = ovl_nlink_start(old); |
5f8415d6b ovl: persistent o... |
645 646 |
if (err) goto out_drop_write; |
51f7e52dc ovl: share inode ... |
647 648 |
inode = d_inode(old); ihold(inode); |
471ec5dcf ovl: struct cattr... |
649 650 651 |
err = ovl_create_or_link(new, inode, &(struct ovl_cattr) {.hardlink = ovl_dentry_upper(old)}, ovl_type_origin(old)); |
51f7e52dc ovl: share inode ... |
652 653 |
if (err) iput(inode); |
e9be9d5e7 overlay filesystem |
654 |
|
0e32992f7 ovl: remove the '... |
655 |
ovl_nlink_end(old); |
e9be9d5e7 overlay filesystem |
656 657 658 659 660 |
out_drop_write: ovl_drop_write(old); out: return err; } |
9020df372 ovl: compare inodes |
661 662 663 664 |
static bool ovl_matches_upper(struct dentry *dentry, struct dentry *upper) { return d_inode(ovl_dentry_upper(dentry)) == d_inode(upper); } |
6d0a8a90a ovl: take lower d... |
665 666 |
static int ovl_remove_and_whiteout(struct dentry *dentry, struct list_head *list) |
e9be9d5e7 overlay filesystem |
667 668 |
{ struct dentry *workdir = ovl_workdir(dentry); |
e9be9d5e7 overlay filesystem |
669 |
struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); |
e9be9d5e7 overlay filesystem |
670 671 672 |
struct dentry *upper; struct dentry *opaquedir = NULL; int err; |
cc6f67bca ovl: mount read-o... |
673 674 |
if (WARN_ON(!workdir)) return -EROFS; |
6d0a8a90a ovl: take lower d... |
675 676 |
if (!list_empty(list)) { opaquedir = ovl_clear_empty(dentry, list); |
30c17ebfb ovl: simplify emp... |
677 678 679 |
err = PTR_ERR(opaquedir); if (IS_ERR(opaquedir)) goto out; |
e9be9d5e7 overlay filesystem |
680 681 682 683 684 |
} err = ovl_lock_rename_workdir(workdir, upperdir); if (err) goto out_dput; |
cfc9fde0b ovl: verify upper... |
685 686 687 688 |
upper = lookup_one_len(dentry->d_name.name, upperdir, dentry->d_name.len); err = PTR_ERR(upper); if (IS_ERR(upper)) |
e9be9d5e7 overlay filesystem |
689 |
goto out_unlock; |
cfc9fde0b ovl: verify upper... |
690 691 692 |
err = -ESTALE; if ((opaquedir && upper != opaquedir) || (!opaquedir && ovl_dentry_upper(dentry) && |
9020df372 ovl: compare inodes |
693 |
!ovl_matches_upper(dentry, upper))) { |
cfc9fde0b ovl: verify upper... |
694 695 |
goto out_dput_upper; } |
e9be9d5e7 overlay filesystem |
696 |
|
e7dd0e713 ovl: whiteout ind... |
697 |
err = ovl_cleanup_and_whiteout(workdir, d_inode(upperdir), upper); |
cfc9fde0b ovl: verify upper... |
698 |
if (err) |
e7dd0e713 ovl: whiteout ind... |
699 |
goto out_d_drop; |
e9be9d5e7 overlay filesystem |
700 |
|
d9854c87f ovl: copy up times |
701 |
ovl_dir_modified(dentry->d_parent, true); |
e9be9d5e7 overlay filesystem |
702 703 |
out_d_drop: d_drop(dentry); |
cfc9fde0b ovl: verify upper... |
704 705 |
out_dput_upper: dput(upper); |
e9be9d5e7 overlay filesystem |
706 707 708 709 710 711 |
out_unlock: unlock_rename(workdir, upperdir); out_dput: dput(opaquedir); out: return err; |
e9be9d5e7 overlay filesystem |
712 |
} |
6d0a8a90a ovl: take lower d... |
713 714 |
static int ovl_remove_upper(struct dentry *dentry, bool is_dir, struct list_head *list) |
e9be9d5e7 overlay filesystem |
715 716 717 |
{ struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); struct inode *dir = upperdir->d_inode; |
11f371041 ovl: verify upper... |
718 |
struct dentry *upper; |
d15951198 ovl: check for em... |
719 |
struct dentry *opaquedir = NULL; |
e9be9d5e7 overlay filesystem |
720 |
int err; |
6d0a8a90a ovl: take lower d... |
721 722 |
if (!list_empty(list)) { opaquedir = ovl_clear_empty(dentry, list); |
d15951198 ovl: check for em... |
723 724 725 726 |
err = PTR_ERR(opaquedir); if (IS_ERR(opaquedir)) goto out; } |
5955102c9 wrappers for ->i_... |
727 |
inode_lock_nested(dir, I_MUTEX_PARENT); |
11f371041 ovl: verify upper... |
728 729 730 731 732 |
upper = lookup_one_len(dentry->d_name.name, upperdir, dentry->d_name.len); err = PTR_ERR(upper); if (IS_ERR(upper)) goto out_unlock; |
e9be9d5e7 overlay filesystem |
733 |
err = -ESTALE; |
d15951198 ovl: check for em... |
734 |
if ((opaquedir && upper != opaquedir) || |
9020df372 ovl: compare inodes |
735 |
(!opaquedir && !ovl_matches_upper(dentry, upper))) |
d15951198 ovl: check for em... |
736 737 738 739 740 741 |
goto out_dput_upper; if (is_dir) err = vfs_rmdir(dir, upper); else err = vfs_unlink(dir, upper, NULL); |
d9854c87f ovl: copy up times |
742 |
ovl_dir_modified(dentry->d_parent, ovl_type_origin(dentry)); |
e9be9d5e7 overlay filesystem |
743 744 745 746 747 748 749 |
/* * Keeping this dentry hashed would mean having to release * upperpath/lowerpath, which could only be done if we are the * sole user of this dentry. Too tricky... Just unhash for * now. */ |
ce9113bbc ovl: fix getcwd()... |
750 751 |
if (!err) d_drop(dentry); |
d15951198 ovl: check for em... |
752 753 |
out_dput_upper: dput(upper); |
11f371041 ovl: verify upper... |
754 |
out_unlock: |
5955102c9 wrappers for ->i_... |
755 |
inode_unlock(dir); |
d15951198 ovl: check for em... |
756 757 |
dput(opaquedir); out: |
e9be9d5e7 overlay filesystem |
758 759 |
return err; } |
6d0a8a90a ovl: take lower d... |
760 761 762 763 764 |
static bool ovl_pure_upper(struct dentry *dentry) { return !ovl_dentry_lower(dentry) && !ovl_test_flag(OVL_WHITEOUTS, d_inode(dentry)); } |
e9be9d5e7 overlay filesystem |
765 766 |
static int ovl_do_remove(struct dentry *dentry, bool is_dir) { |
e9be9d5e7 overlay filesystem |
767 |
int err; |
1175b6b8d ovl: do operation... |
768 |
const struct cred *old_cred; |
d9854c87f ovl: copy up times |
769 |
struct dentry *upperdentry; |
6d0a8a90a ovl: take lower d... |
770 771 772 773 774 775 776 777 778 |
bool lower_positive = ovl_lower_positive(dentry); LIST_HEAD(list); /* No need to clean pure upper removed by vfs_rmdir() */ if (is_dir && (lower_positive || !ovl_pure_upper(dentry))) { err = ovl_check_empty_dir(dentry, &list); if (err) goto out; } |
1175b6b8d ovl: do operation... |
779 |
|
e9be9d5e7 overlay filesystem |
780 781 782 783 784 785 786 |
err = ovl_want_write(dentry); if (err) goto out; err = ovl_copy_up(dentry->d_parent); if (err) goto out_drop_write; |
0e32992f7 ovl: remove the '... |
787 |
err = ovl_nlink_start(dentry); |
5f8415d6b ovl: persistent o... |
788 789 |
if (err) goto out_drop_write; |
e9be9d5e7 overlay filesystem |
790 |
|
1175b6b8d ovl: do operation... |
791 |
old_cred = ovl_override_creds(dentry->d_sb); |
6d0a8a90a ovl: take lower d... |
792 793 |
if (!lower_positive) err = ovl_remove_upper(dentry, is_dir, &list); |
1175b6b8d ovl: do operation... |
794 |
else |
6d0a8a90a ovl: take lower d... |
795 |
err = ovl_remove_and_whiteout(dentry, &list); |
1175b6b8d ovl: do operation... |
796 |
revert_creds(old_cred); |
dbc816d05 ovl: clear nlink ... |
797 798 799 800 801 802 |
if (!err) { if (is_dir) clear_nlink(dentry->d_inode); else drop_nlink(dentry->d_inode); } |
0e32992f7 ovl: remove the '... |
803 |
ovl_nlink_end(dentry); |
d9854c87f ovl: copy up times |
804 805 806 807 808 809 810 811 812 813 |
/* * Copy ctime * * Note: we fail to update ctime if there was no copy-up, only a * whiteout */ upperdentry = ovl_dentry_upper(dentry); if (upperdentry) ovl_copyattr(d_inode(upperdentry), d_inode(dentry)); |
e9be9d5e7 overlay filesystem |
814 815 816 |
out_drop_write: ovl_drop_write(dentry); out: |
6d0a8a90a ovl: take lower d... |
817 |
ovl_cache_free(&list); |
e9be9d5e7 overlay filesystem |
818 819 820 821 822 823 824 825 826 827 828 829 |
return err; } static int ovl_unlink(struct inode *dir, struct dentry *dentry) { return ovl_do_remove(dentry, false); } static int ovl_rmdir(struct inode *dir, struct dentry *dentry) { return ovl_do_remove(dentry, true); } |
370e55ace ovl: rename: simp... |
830 831 832 833 834 835 |
static bool ovl_type_merge_or_lower(struct dentry *dentry) { enum ovl_path_type type = ovl_path_type(dentry); return OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type); } |
a6c606551 ovl: redirect on ... |
836 837 838 839 840 |
static bool ovl_can_move(struct dentry *dentry) { return ovl_redirect_dir(dentry->d_sb) || !d_is_dir(dentry) || !ovl_type_merge_or_lower(dentry); } |
7bb083837 ovl: Set redirect... |
841 |
static char *ovl_get_redirect(struct dentry *dentry, bool abs_redirect) |
a6c606551 ovl: redirect on ... |
842 843 844 |
{ char *buf, *ret; struct dentry *d, *tmp; |
3ea22a71b ovl: allow settin... |
845 |
int buflen = ovl_redirect_max + 1; |
a6c606551 ovl: redirect on ... |
846 |
|
7bb083837 ovl: Set redirect... |
847 |
if (!abs_redirect) { |
a6c606551 ovl: redirect on ... |
848 849 850 851 |
ret = kstrndup(dentry->d_name.name, dentry->d_name.len, GFP_KERNEL); goto out; } |
0ee931c4e mm: treewide: rem... |
852 |
buf = ret = kmalloc(buflen, GFP_KERNEL); |
a6c606551 ovl: redirect on ... |
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 |
if (!buf) goto out; buflen--; buf[buflen] = '\0'; for (d = dget(dentry); !IS_ROOT(d);) { const char *name; int thislen; spin_lock(&d->d_lock); name = ovl_dentry_get_redirect(d); if (name) { thislen = strlen(name); } else { name = d->d_name.name; thislen = d->d_name.len; } /* If path is too long, fall back to userspace move */ if (thislen + (name[0] != '/') > buflen) { ret = ERR_PTR(-EXDEV); spin_unlock(&d->d_lock); goto out_put; } buflen -= thislen; memcpy(&buf[buflen], name, thislen); tmp = dget_dlock(d->d_parent); spin_unlock(&d->d_lock); dput(d); d = tmp; /* Absolute redirect: finished */ if (buf[buflen] == '/') break; buflen--; buf[buflen] = '/'; } ret = kstrdup(&buf[buflen], GFP_KERNEL); out_put: dput(d); kfree(buf); out: return ret ? ret : ERR_PTR(-ENOMEM); } |
7bb083837 ovl: Set redirect... |
899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 |
static bool ovl_need_absolute_redirect(struct dentry *dentry, bool samedir) { struct dentry *lowerdentry; if (!samedir) return true; if (d_is_dir(dentry)) return false; /* * For non-dir hardlinked files, we need absolute redirects * in general as two upper hardlinks could be in different * dirs. We could put a relative redirect now and convert * it to absolute redirect later. But when nlink > 1 and * indexing is on, that means relative redirect needs to be * converted to absolute during copy up of another lower * hardllink as well. * * So without optimizing too much, just check if lower is * a hard link or not. If lower is hard link, put absolute * redirect. */ lowerdentry = ovl_dentry_lower(dentry); return (d_inode(lowerdentry)->i_nlink > 1); } |
a6c606551 ovl: redirect on ... |
925 926 927 928 |
static int ovl_set_redirect(struct dentry *dentry, bool samedir) { int err; const char *redirect = ovl_dentry_get_redirect(dentry); |
7bb083837 ovl: Set redirect... |
929 |
bool absolute_redirect = ovl_need_absolute_redirect(dentry, samedir); |
a6c606551 ovl: redirect on ... |
930 |
|
7bb083837 ovl: Set redirect... |
931 |
if (redirect && (!absolute_redirect || redirect[0] == '/')) |
a6c606551 ovl: redirect on ... |
932 |
return 0; |
7bb083837 ovl: Set redirect... |
933 |
redirect = ovl_get_redirect(dentry, absolute_redirect); |
a6c606551 ovl: redirect on ... |
934 935 |
if (IS_ERR(redirect)) return PTR_ERR(redirect); |
21a228781 ovl: handle renam... |
936 937 938 |
err = ovl_check_setxattr(dentry, ovl_dentry_upper(dentry), OVL_XATTR_REDIRECT, redirect, strlen(redirect), -EXDEV); |
a6c606551 ovl: redirect on ... |
939 940 941 942 943 944 |
if (!err) { spin_lock(&dentry->d_lock); ovl_dentry_set_redirect(dentry, redirect); spin_unlock(&dentry->d_lock); } else { kfree(redirect); |
da2e6b7ee ovl: fix overlay:... |
945 946 947 |
pr_warn_ratelimited("overlayfs: failed to set redirect (%i) ", err); |
a6c606551 ovl: redirect on ... |
948 949 950 951 952 |
/* Fall back to userspace copy-up */ err = -EXDEV; } return err; } |
6c02cb59e ovl: rename ovl_r... |
953 954 955 |
static int ovl_rename(struct inode *olddir, struct dentry *old, struct inode *newdir, struct dentry *new, unsigned int flags) |
e9be9d5e7 overlay filesystem |
956 957 |
{ int err; |
e9be9d5e7 overlay filesystem |
958 959 960 961 962 963 964 |
struct dentry *old_upperdir; struct dentry *new_upperdir; struct dentry *olddentry; struct dentry *newdentry; struct dentry *trap; bool old_opaque; bool new_opaque; |
e9be9d5e7 overlay filesystem |
965 |
bool cleanup_whiteout = false; |
0e32992f7 ovl: remove the '... |
966 |
bool update_nlink = false; |
e9be9d5e7 overlay filesystem |
967 |
bool overwrite = !(flags & RENAME_EXCHANGE); |
e36cb0b89 VFS: (Scripted) C... |
968 |
bool is_dir = d_is_dir(old); |
370e55ace ovl: rename: simp... |
969 |
bool new_is_dir = d_is_dir(new); |
a6c606551 ovl: redirect on ... |
970 |
bool samedir = olddir == newdir; |
e9be9d5e7 overlay filesystem |
971 972 |
struct dentry *opaquedir = NULL; const struct cred *old_cred = NULL; |
6d0a8a90a ovl: take lower d... |
973 |
LIST_HEAD(list); |
e9be9d5e7 overlay filesystem |
974 975 976 977 978 979 |
err = -EINVAL; if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE)) goto out; flags &= ~RENAME_NOREPLACE; |
e9be9d5e7 overlay filesystem |
980 |
/* Don't copy up directory trees */ |
e9be9d5e7 overlay filesystem |
981 |
err = -EXDEV; |
a6c606551 ovl: redirect on ... |
982 |
if (!ovl_can_move(old)) |
370e55ace ovl: rename: simp... |
983 |
goto out; |
a6c606551 ovl: redirect on ... |
984 |
if (!overwrite && !ovl_can_move(new)) |
e9be9d5e7 overlay filesystem |
985 |
goto out; |
e9be9d5e7 overlay filesystem |
986 |
|
6d0a8a90a ovl: take lower d... |
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 |
if (overwrite && new_is_dir && !ovl_pure_upper(new)) { err = ovl_check_empty_dir(new, &list); if (err) goto out; } if (overwrite) { if (ovl_lower_positive(old)) { if (!ovl_dentry_is_whiteout(new)) { /* Whiteout source */ flags |= RENAME_WHITEOUT; } else { /* Switch whiteouts */ flags |= RENAME_EXCHANGE; } } else if (is_dir && ovl_dentry_is_whiteout(new)) { flags |= RENAME_EXCHANGE; cleanup_whiteout = true; } } |
e9be9d5e7 overlay filesystem |
1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 |
err = ovl_want_write(old); if (err) goto out; err = ovl_copy_up(old); if (err) goto out_drop_write; err = ovl_copy_up(new->d_parent); if (err) goto out_drop_write; if (!overwrite) { err = ovl_copy_up(new); if (err) goto out_drop_write; |
0e32992f7 ovl: remove the '... |
1022 1023 |
} else if (d_inode(new)) { err = ovl_nlink_start(new); |
5f8415d6b ovl: persistent o... |
1024 1025 |
if (err) goto out_drop_write; |
0e32992f7 ovl: remove the '... |
1026 1027 |
update_nlink = true; |
e9be9d5e7 overlay filesystem |
1028 |
} |
1175b6b8d ovl: do operation... |
1029 |
old_cred = ovl_override_creds(old->d_sb); |
e9be9d5e7 overlay filesystem |
1030 |
|
6d0a8a90a ovl: take lower d... |
1031 1032 |
if (!list_empty(&list)) { opaquedir = ovl_clear_empty(new, &list); |
e9be9d5e7 overlay filesystem |
1033 1034 1035 1036 1037 1038 |
err = PTR_ERR(opaquedir); if (IS_ERR(opaquedir)) { opaquedir = NULL; goto out_revert_creds; } } |
e9be9d5e7 overlay filesystem |
1039 1040 |
old_upperdir = ovl_dentry_upper(old->d_parent); new_upperdir = ovl_dentry_upper(new->d_parent); |
ee1d6d37b ovl: mark upper d... |
1041 1042 1043 |
if (!samedir) { /* * When moving a merge dir or non-dir with copy up origin into |
f3a156858 ovl: mark upper m... |
1044 1045 1046 |
* a new parent, we are marking the new parent dir "impure". * When ovl_iterate() iterates an "impure" upper dir, it will * lookup the origin inodes of the entries to fill d_ino. |
ee1d6d37b ovl: mark upper d... |
1047 |
*/ |
f3a156858 ovl: mark upper m... |
1048 |
if (ovl_type_origin(old)) { |
ee1d6d37b ovl: mark upper d... |
1049 1050 1051 1052 |
err = ovl_set_impure(new->d_parent, new_upperdir); if (err) goto out_revert_creds; } |
f3a156858 ovl: mark upper m... |
1053 |
if (!overwrite && ovl_type_origin(new)) { |
ee1d6d37b ovl: mark upper d... |
1054 1055 1056 1057 1058 |
err = ovl_set_impure(old->d_parent, old_upperdir); if (err) goto out_revert_creds; } } |
e9be9d5e7 overlay filesystem |
1059 |
trap = lock_rename(new_upperdir, old_upperdir); |
11f371041 ovl: verify upper... |
1060 1061 1062 1063 1064 1065 1066 |
olddentry = lookup_one_len(old->d_name.name, old_upperdir, old->d_name.len); err = PTR_ERR(olddentry); if (IS_ERR(olddentry)) goto out_unlock; err = -ESTALE; |
9020df372 ovl: compare inodes |
1067 |
if (!ovl_matches_upper(old, olddentry)) |
11f371041 ovl: verify upper... |
1068 1069 1070 1071 1072 1073 1074 |
goto out_dput_old; newdentry = lookup_one_len(new->d_name.name, new_upperdir, new->d_name.len); err = PTR_ERR(newdentry); if (IS_ERR(newdentry)) goto out_dput_old; |
3ee23ff10 ovl: check lower ... |
1075 1076 |
old_opaque = ovl_dentry_is_opaque(old); new_opaque = ovl_dentry_is_opaque(new); |
11f371041 ovl: verify upper... |
1077 |
err = -ESTALE; |
09d8b5867 ovl: move __upper... |
1078 |
if (d_inode(new) && ovl_dentry_upper(new)) { |
e9be9d5e7 overlay filesystem |
1079 |
if (opaquedir) { |
11f371041 ovl: verify upper... |
1080 1081 |
if (newdentry != opaquedir) goto out_dput; |
e9be9d5e7 overlay filesystem |
1082 |
} else { |
9020df372 ovl: compare inodes |
1083 |
if (!ovl_matches_upper(new, newdentry)) |
11f371041 ovl: verify upper... |
1084 |
goto out_dput; |
e9be9d5e7 overlay filesystem |
1085 1086 |
} } else { |
11f371041 ovl: verify upper... |
1087 1088 1089 |
if (!d_is_negative(newdentry) && (!new_opaque || !ovl_is_whiteout(newdentry))) goto out_dput; |
e9be9d5e7 overlay filesystem |
1090 |
} |
e9be9d5e7 overlay filesystem |
1091 1092 1093 1094 |
if (olddentry == trap) goto out_dput; if (newdentry == trap) goto out_dput; |
82a0e2573 ovl: relax WARN_O... |
1095 |
if (olddentry->d_inode == newdentry->d_inode) |
804032fab ovl: don't check ... |
1096 |
goto out_dput; |
5cf5b477f ovl: opaque cleanup |
1097 |
err = 0; |
7bb083837 ovl: Set redirect... |
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 |
if (ovl_type_merge_or_lower(old)) err = ovl_set_redirect(old, samedir); else if (is_dir && !old_opaque && ovl_type_merge(new->d_parent)) err = ovl_set_opaque_xerr(old, olddentry, -EXDEV); if (err) goto out_dput; if (!overwrite && ovl_type_merge_or_lower(new)) err = ovl_set_redirect(new, samedir); else if (!overwrite && new_is_dir && !new_opaque && ovl_type_merge(old->d_parent)) err = ovl_set_opaque_xerr(new, newdentry, -EXDEV); if (err) goto out_dput; |
e9be9d5e7 overlay filesystem |
1112 |
|
3ee23ff10 ovl: check lower ... |
1113 1114 1115 |
err = ovl_do_rename(old_upperdir->d_inode, olddentry, new_upperdir->d_inode, newdentry, flags); if (err) |
e9be9d5e7 overlay filesystem |
1116 |
goto out_dput; |
e9be9d5e7 overlay filesystem |
1117 1118 1119 |
if (cleanup_whiteout) ovl_cleanup(old_upperdir->d_inode, newdentry); |
f681eb1d5 ovl: fix nlink le... |
1120 1121 1122 1123 1124 1125 |
if (overwrite && d_inode(new)) { if (new_is_dir) clear_nlink(d_inode(new)); else drop_nlink(d_inode(new)); } |
d9854c87f ovl: copy up times |
1126 1127 1128 1129 1130 1131 1132 1133 1134 |
ovl_dir_modified(old->d_parent, ovl_type_origin(old) || (!overwrite && ovl_type_origin(new))); ovl_dir_modified(new->d_parent, ovl_type_origin(old) || (d_inode(new) && ovl_type_origin(new))); /* copy ctime: */ ovl_copyattr(d_inode(olddentry), d_inode(old)); if (d_inode(new) && ovl_dentry_upper(new)) ovl_copyattr(d_inode(newdentry), d_inode(new)); |
e9be9d5e7 overlay filesystem |
1135 1136 1137 |
out_dput: dput(newdentry); |
11f371041 ovl: verify upper... |
1138 1139 |
out_dput_old: dput(olddentry); |
e9be9d5e7 overlay filesystem |
1140 1141 1142 |
out_unlock: unlock_rename(new_upperdir, old_upperdir); out_revert_creds: |
1175b6b8d ovl: do operation... |
1143 |
revert_creds(old_cred); |
0e32992f7 ovl: remove the '... |
1144 1145 |
if (update_nlink) ovl_nlink_end(new); |
e9be9d5e7 overlay filesystem |
1146 1147 1148 1149 |
out_drop_write: ovl_drop_write(old); out: dput(opaquedir); |
6d0a8a90a ovl: take lower d... |
1150 |
ovl_cache_free(&list); |
e9be9d5e7 overlay filesystem |
1151 1152 1153 1154 1155 1156 1157 1158 1159 |
return err; } const struct inode_operations ovl_dir_inode_operations = { .lookup = ovl_lookup, .mkdir = ovl_mkdir, .symlink = ovl_symlink, .unlink = ovl_unlink, .rmdir = ovl_rmdir, |
6c02cb59e ovl: rename ovl_r... |
1160 |
.rename = ovl_rename, |
e9be9d5e7 overlay filesystem |
1161 1162 1163 1164 1165 |
.link = ovl_link, .setattr = ovl_setattr, .create = ovl_create, .mknod = ovl_mknod, .permission = ovl_permission, |
5b712091a ovl: merge getatt... |
1166 |
.getattr = ovl_getattr, |
e9be9d5e7 overlay filesystem |
1167 |
.listxattr = ovl_listxattr, |
39a25b2b3 ovl: define ->get... |
1168 |
.get_acl = ovl_get_acl, |
d719e8f26 ovl: update atime... |
1169 |
.update_time = ovl_update_time, |
e9be9d5e7 overlay filesystem |
1170 |
}; |