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Merge branch 'cross-rename' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs

Browse source 
Pull renameat2 system call from Miklos Szeredi:
 "This adds a new syscall, renameat2(), which is the same as renameat()
  but with a flags argument.

  The purpose of extending rename is to add cross-rename, a symmetric
  variant of rename, which exchanges the two files.  This allows
  interesting things, which were not possible before, for example
  atomically replacing a directory tree with a symlink, etc...  This
  also allows overlayfs and friends to operate on whiteouts atomically.

  Andy Lutomirski also suggested a "noreplace" flag, which disables the
  overwriting behavior of rename.

  These two flags, RENAME_EXCHANGE and RENAME_NOREPLACE are only
  implemented for ext4 as an example and for testing"

* 'cross-rename' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
  ext4: add cross rename support
  ext4: rename: split out helper functions
  ext4: rename: move EMLINK check up
  ext4: rename: create ext4_renament structure for local vars
  vfs: add cross-rename
  vfs: lock_two_nondirectories: allow directory args
  security: add flags to rename hooks
  vfs: add RENAME_NOREPLACE flag
  vfs: add renameat2 syscall
  vfs: rename: use common code for dir and non-dir
  vfs: rename: move d_move() up
  vfs: add d_is_dir()
This commit is contained in:
Linus Torvalds 2014-04-04 14:03:05 -07:00
commit 7df934526c
17 changed files with 660 additions and 330 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
Documentation/filesystems/Locking
View file

@ -47,6 +47,8 @@ prototypes:
int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
int (*rename) (struct inode *, struct dentry *,
struct inode *, struct dentry *);
int (*rename2) (struct inode *, struct dentry *,
struct inode *, struct dentry *, unsigned int);
int (*readlink) (struct dentry *, char __user *,int);
void * (*follow_link) (struct dentry *, struct nameidata *);
void (*put_link) (struct dentry *, struct nameidata *, void *);
@ -78,6 +80,7 @@ mkdir: yes
unlink: yes (both)
rmdir: yes (both) (see below)
rename: yes (all) (see below)
rename2: yes (all) (see below)
readlink: no
follow_link: no
put_link: no
@ -96,7 +99,8 @@ tmpfile: no
Additionally, ->rmdir(), ->unlink() and ->rename() have ->i_mutex on
victim.
cross-directory ->rename() has (per-superblock) ->s_vfs_rename_sem.
cross-directory ->rename() and rename2() has (per-superblock)
->s_vfs_rename_sem.
See Documentation/filesystems/directory-locking for more detailed discussion
of the locking scheme for directory operations.

16
Documentation/filesystems/vfs.txt
View file

@ -347,6 +347,8 @@ struct inode_operations {
int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
int (*rename) (struct inode *, struct dentry *,
struct inode *, struct dentry *);
int (*rename2) (struct inode *, struct dentry *,
struct inode *, struct dentry *, unsigned int);
int (*readlink) (struct dentry *, char __user *,int);
void * (*follow_link) (struct dentry *, struct nameidata *);
void (*put_link) (struct dentry *, struct nameidata *, void *);
@ -414,6 +416,20 @@ otherwise noted.
rename: called by the rename(2) system call to rename the object to
have the parent and name given by the second inode and dentry.
rename2: this has an additional flags argument compared to rename.
If no flags are supported by the filesystem then this method
need not be implemented. If some flags are supported then the
filesystem must return -EINVAL for any unsupported or unknown
flags. Currently the following flags are implemented:
(1) RENAME_NOREPLACE: this flag indicates that if the target
of the rename exists the rename should fail with -EEXIST
instead of replacing the target. The VFS already checks for
existence, so for local filesystems the RENAME_NOREPLACE
implementation is equivalent to plain rename.
(2) RENAME_EXCHANGE: exchange source and target. Both must
exist; this is checked by the VFS. Unlike plain rename,
source and target may be of different type.
readlink: called by the readlink(2) system call. Only required if
you want to support reading symbolic links

1
arch/x86/syscalls/syscall_64.tbl
View file

@ -322,6 +322,7 @@
313 common finit_module sys_finit_module
314 common sched_setattr sys_sched_setattr
315 common sched_getattr sys_sched_getattr
316 common renameat2 sys_renameat2
#
# x32-specific system call numbers start at 512 to avoid cache impact

4
drivers/staging/lustre/lustre/include/linux/lustre_compat25.h
View file

@ -105,8 +105,8 @@ static inline void ll_set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
#define ll_vfs_unlink(inode,entry,mnt) vfs_unlink(inode,entry)
#define ll_vfs_mknod(dir,entry,mnt,mode,dev) vfs_mknod(dir,entry,mode,dev)
#define ll_security_inode_unlink(dir,entry,mnt) security_inode_unlink(dir,entry)
#define ll_vfs_rename(old,old_dir,mnt,new,new_dir,mnt1,delegated_inode) \
vfs_rename(old,old_dir,new,new_dir,delegated_inode)
#define ll_vfs_rename(old, old_dir, mnt, new, new_dir, mnt1) \
vfs_rename(old, old_dir, new, new_dir, NULL, 0)
#define cfs_bio_io_error(a,b) bio_io_error((a))
#define cfs_bio_endio(a,b,c) bio_endio((a),(c))

2
drivers/staging/lustre/lustre/lvfs/lvfs_linux.c
View file

@ -223,7 +223,7 @@ int lustre_rename(struct dentry *dir, struct vfsmount *mnt,
GOTO(put_old, err = PTR_ERR(dchild_new));
err = ll_vfs_rename(dir->d_inode, dchild_old, mnt,
dir->d_inode, dchild_new, mnt, NULL);
dir->d_inode, dchild_new, mnt);
dput(dchild_new);
put_old:

4
fs/cachefiles/namei.c
View file

@ -391,12 +391,12 @@ static int cachefiles_bury_object(struct cachefiles_cache *cache,
path.dentry = dir;
path_to_graveyard.mnt = cache->mnt;
path_to_graveyard.dentry = cache->graveyard;
ret = security_path_rename(&path, rep, &path_to_graveyard, grave);
ret = security_path_rename(&path, rep, &path_to_graveyard, grave, 0);
if (ret < 0) {
cachefiles_io_error(cache, "Rename security error %d", ret);
} else {
ret = vfs_rename(dir->d_inode, rep,
cache->graveyard->d_inode, grave, NULL);
cache->graveyard->d_inode, grave, NULL, 0);
if (ret != 0 && ret != -ENOMEM)
cachefiles_io_error(cache,
"Rename failed with error %d", ret);

50
fs/dcache.c
View file

@ -2483,12 +2483,14 @@ static void switch_names(struct dentry *dentry, struct dentry *target)
dentry->d_name.name = dentry->d_iname;
} else {
/*
* Both are internal. Just copy target to dentry
* Both are internal.
*/
memcpy(dentry->d_iname, target->d_name.name,
target->d_name.len + 1);
dentry->d_name.len = target->d_name.len;
return;
unsigned int i;
BUILD_BUG_ON(!IS_ALIGNED(DNAME_INLINE_LEN, sizeof(long)));
for (i = 0; i < DNAME_INLINE_LEN / sizeof(long); i++) {
swap(((long *) &dentry->d_iname)[i],
((long *) &target->d_iname)[i]);
}
}
}
swap(dentry->d_name.len, target->d_name.len);
@ -2545,13 +2547,15 @@ static void dentry_unlock_parents_for_move(struct dentry *dentry,
* __d_move - move a dentry
* @dentry: entry to move
* @target: new dentry
* @exchange: exchange the two dentries
*
* Update the dcache to reflect the move of a file name. Negative
* dcache entries should not be moved in this way. Caller must hold
* rename_lock, the i_mutex of the source and target directories,
* and the sb->s_vfs_rename_mutex if they differ. See lock_rename().
*/
static void __d_move(struct dentry * dentry, struct dentry * target)
static void __d_move(struct dentry *dentry, struct dentry *target,
bool exchange)
{
if (!dentry->d_inode)
printk(KERN_WARNING "VFS: moving negative dcache entry\n");
@ -2573,8 +2577,15 @@ static void __d_move(struct dentry * dentry, struct dentry * target)
__d_drop(dentry);
__d_rehash(dentry, d_hash(target->d_parent, target->d_name.hash));
/* Unhash the target: dput() will then get rid of it */
/*
* Unhash the target (d_delete() is not usable here). If exchanging
* the two dentries, then rehash onto the other's hash queue.
*/
__d_drop(target);
if (exchange) {
__d_rehash(target,
d_hash(dentry->d_parent, dentry->d_name.hash));
}
list_del(&dentry->d_u.d_child);
list_del(&target->d_u.d_child);
@ -2601,6 +2612,8 @@ static void __d_move(struct dentry * dentry, struct dentry * target)
write_seqcount_end(&dentry->d_seq);
dentry_unlock_parents_for_move(dentry, target);
if (exchange)
fsnotify_d_move(target);
spin_unlock(&target->d_lock);
fsnotify_d_move(dentry);
spin_unlock(&dentry->d_lock);
@ -2618,11 +2631,30 @@ static void __d_move(struct dentry * dentry, struct dentry * target)
void d_move(struct dentry *dentry, struct dentry *target)
{
write_seqlock(&rename_lock);
__d_move(dentry, target);
__d_move(dentry, target, false);
write_sequnlock(&rename_lock);
}
EXPORT_SYMBOL(d_move);
/*
* d_exchange - exchange two dentries
* @dentry1: first dentry
* @dentry2: second dentry
*/
void d_exchange(struct dentry *dentry1, struct dentry *dentry2)
{
write_seqlock(&rename_lock);
WARN_ON(!dentry1->d_inode);
WARN_ON(!dentry2->d_inode);
WARN_ON(IS_ROOT(dentry1));
WARN_ON(IS_ROOT(dentry2));
__d_move(dentry1, dentry2, true);
write_sequnlock(&rename_lock);
}
/**
* d_ancestor - search for an ancestor
* @p1: ancestor dentry
@ -2670,7 +2702,7 @@ static struct dentry *__d_unalias(struct inode *inode,
m2 = &alias->d_parent->d_inode->i_mutex;
out_unalias:
if (likely(!d_mountpoint(alias))) {
__d_move(alias, dentry);
__d_move(alias, dentry, false);
ret = alias;
}
out_err:

2
fs/ecryptfs/inode.c
View file

@ -641,7 +641,7 @@ ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
}
rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
lower_new_dir_dentry->d_inode, lower_new_dentry,
NULL);
NULL, 0);
if (rc)
goto out_lock;
if (target_inode)

478
fs/ext4/namei.c
View file

@ -3000,6 +3000,154 @@ static struct buffer_head *ext4_get_first_dir_block(handle_t *handle,
return ext4_get_first_inline_block(inode, parent_de, retval);
}
struct ext4_renament {
struct inode *dir;
struct dentry *dentry;
struct inode *inode;
bool is_dir;
int dir_nlink_delta;
/* entry for "dentry" */
struct buffer_head *bh;
struct ext4_dir_entry_2 *de;
int inlined;
/* entry for ".." in inode if it's a directory */
struct buffer_head *dir_bh;
struct ext4_dir_entry_2 *parent_de;
int dir_inlined;
};
static int ext4_rename_dir_prepare(handle_t *handle, struct ext4_renament *ent)
{
int retval;
ent->dir_bh = ext4_get_first_dir_block(handle, ent->inode,
&retval, &ent->parent_de,
&ent->dir_inlined);
if (!ent->dir_bh)
return retval;
if (le32_to_cpu(ent->parent_de->inode) != ent->dir->i_ino)
return -EIO;
BUFFER_TRACE(ent->dir_bh, "get_write_access");
return ext4_journal_get_write_access(handle, ent->dir_bh);
}
static int ext4_rename_dir_finish(handle_t *handle, struct ext4_renament *ent,
unsigned dir_ino)
{
int retval;
ent->parent_de->inode = cpu_to_le32(dir_ino);
BUFFER_TRACE(ent->dir_bh, "call ext4_handle_dirty_metadata");
if (!ent->dir_inlined) {
if (is_dx(ent->inode)) {
retval = ext4_handle_dirty_dx_node(handle,
ent->inode,
ent->dir_bh);
} else {
retval = ext4_handle_dirty_dirent_node(handle,
ent->inode,
ent->dir_bh);
}
} else {
retval = ext4_mark_inode_dirty(handle, ent->inode);
}
if (retval) {
ext4_std_error(ent->dir->i_sb, retval);
return retval;
}
return 0;
}
static int ext4_setent(handle_t *handle, struct ext4_renament *ent,
unsigned ino, unsigned file_type)
{
int retval;
BUFFER_TRACE(ent->bh, "get write access");
retval = ext4_journal_get_write_access(handle, ent->bh);
if (retval)
return retval;
ent->de->inode = cpu_to_le32(ino);
if (EXT4_HAS_INCOMPAT_FEATURE(ent->dir->i_sb,
EXT4_FEATURE_INCOMPAT_FILETYPE))
ent->de->file_type = file_type;
ent->dir->i_version++;
ent->dir->i_ctime = ent->dir->i_mtime =
ext4_current_time(ent->dir);
ext4_mark_inode_dirty(handle, ent->dir);
BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata");
if (!ent->inlined) {
retval = ext4_handle_dirty_dirent_node(handle,
ent->dir, ent->bh);
if (unlikely(retval)) {
ext4_std_error(ent->dir->i_sb, retval);
return retval;
}
}
brelse(ent->bh);
ent->bh = NULL;
return 0;
}
static int ext4_find_delete_entry(handle_t *handle, struct inode *dir,
const struct qstr *d_name)
{
int retval = -ENOENT;
struct buffer_head *bh;
struct ext4_dir_entry_2 *de;
bh = ext4_find_entry(dir, d_name, &de, NULL);
if (bh) {
retval = ext4_delete_entry(handle, dir, de, bh);
brelse(bh);
}
return retval;
}
static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent)
{
int retval;
/*
* ent->de could have moved from under us during htree split, so make
* sure that we are deleting the right entry. We might also be pointing
* to a stale entry in the unused part of ent->bh so just checking inum
* and the name isn't enough.
*/
if (le32_to_cpu(ent->de->inode) != ent->inode->i_ino ||
ent->de->name_len != ent->dentry->d_name.len ||
strncmp(ent->de->name, ent->dentry->d_name.name,
ent->de->name_len)) {
retval = ext4_find_delete_entry(handle, ent->dir,
&ent->dentry->d_name);
} else {
retval = ext4_delete_entry(handle, ent->dir, ent->de, ent->bh);
if (retval == -ENOENT) {
retval = ext4_find_delete_entry(handle, ent->dir,
&ent->dentry->d_name);
}
}
if (retval) {
ext4_warning(ent->dir->i_sb,
"Deleting old file (%lu), %d, error=%d",
ent->dir->i_ino, ent->dir->i_nlink, retval);
}
}
static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
{
if (ent->dir_nlink_delta) {
if (ent->dir_nlink_delta == -1)
ext4_dec_count(handle, ent->dir);
else
ext4_inc_count(handle, ent->dir);
ext4_mark_inode_dirty(handle, ent->dir);
}
}
/*
* Anybody can rename anything with this: the permission checks are left to the
* higher-level routines.
@ -3012,198 +3160,267 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
handle_t *handle = NULL;
struct inode *old_inode, *new_inode;
struct buffer_head *old_bh, *new_bh, *dir_bh;
struct ext4_dir_entry_2 *old_de, *new_de;
struct ext4_renament old = {
.dir = old_dir,
.dentry = old_dentry,
.inode = old_dentry->d_inode,
};
struct ext4_renament new = {
.dir = new_dir,
.dentry = new_dentry,
.inode = new_dentry->d_inode,
};
int retval;
int inlined = 0, new_inlined = 0;
struct ext4_dir_entry_2 *parent_de;
dquot_initialize(old_dir);
dquot_initialize(new_dir);
old_bh = new_bh = dir_bh = NULL;
dquot_initialize(old.dir);
dquot_initialize(new.dir);
/* Initialize quotas before so that eventual writes go
* in separate transaction */
if (new_dentry->d_inode)
dquot_initialize(new_dentry->d_inode);
if (new.inode)
dquot_initialize(new.inode);
old_bh = ext4_find_entry(old_dir, &old_dentry->d_name, &old_de, NULL);
old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL);
/*
* Check for inode number is _not_ due to possible IO errors.
* We might rmdir the source, keep it as pwd of some process
* and merrily kill the link to whatever was created under the
* same name. Goodbye sticky bit ;-<
*/
old_inode = old_dentry->d_inode;
retval = -ENOENT;
if (!old_bh || le32_to_cpu(old_de->inode) != old_inode->i_ino)
if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
goto end_rename;
new_inode = new_dentry->d_inode;
new_bh = ext4_find_entry(new_dir, &new_dentry->d_name,
&new_de, &new_inlined);
if (new_bh) {
if (!new_inode) {
brelse(new_bh);
new_bh = NULL;
new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
&new.de, &new.inlined);
if (new.bh) {
if (!new.inode) {
brelse(new.bh);
new.bh = NULL;
}
}
if (new_inode && !test_opt(new_dir->i_sb, NO_AUTO_DA_ALLOC))
ext4_alloc_da_blocks(old_inode);
if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC))
ext4_alloc_da_blocks(old.inode);
handle = ext4_journal_start(old_dir, EXT4_HT_DIR,
(2 * EXT4_DATA_TRANS_BLOCKS(old_dir->i_sb) +
handle = ext4_journal_start(old.dir, EXT4_HT_DIR,
(2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2));
if (IS_ERR(handle))
return PTR_ERR(handle);
if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
ext4_handle_sync(handle);
if (S_ISDIR(old_inode->i_mode)) {
if (new_inode) {
if (S_ISDIR(old.inode->i_mode)) {
if (new.inode) {
retval = -ENOTEMPTY;
if (!empty_dir(new_inode))
if (!empty_dir(new.inode))
goto end_rename;
} else {
retval = -EMLINK;
if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir))
goto end_rename;
}
retval = -EIO;
dir_bh = ext4_get_first_dir_block(handle, old_inode,
&retval, &parent_de,
&inlined);
if (!dir_bh)
goto end_rename;
if (le32_to_cpu(parent_de->inode) != old_dir->i_ino)
goto end_rename;
retval = -EMLINK;
if (!new_inode && new_dir != old_dir &&
EXT4_DIR_LINK_MAX(new_dir))
goto end_rename;
BUFFER_TRACE(dir_bh, "get_write_access");
retval = ext4_journal_get_write_access(handle, dir_bh);
retval = ext4_rename_dir_prepare(handle, &old);
if (retval)
goto end_rename;
}
if (!new_bh) {
retval = ext4_add_entry(handle, new_dentry, old_inode);
if (!new.bh) {
retval = ext4_add_entry(handle, new.dentry, old.inode);
if (retval)
goto end_rename;
} else {
BUFFER_TRACE(new_bh, "get write access");
retval = ext4_journal_get_write_access(handle, new_bh);
retval = ext4_setent(handle, &new,
old.inode->i_ino, old.de->file_type);
if (retval)
goto end_rename;
new_de->inode = cpu_to_le32(old_inode->i_ino);
if (EXT4_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
EXT4_FEATURE_INCOMPAT_FILETYPE))
new_de->file_type = old_de->file_type;
new_dir->i_version++;
new_dir->i_ctime = new_dir->i_mtime =
ext4_current_time(new_dir);
ext4_mark_inode_dirty(handle, new_dir);
BUFFER_TRACE(new_bh, "call ext4_handle_dirty_metadata");
if (!new_inlined) {
retval = ext4_handle_dirty_dirent_node(handle,
new_dir, new_bh);
if (unlikely(retval)) {
ext4_std_error(new_dir->i_sb, retval);
goto end_rename;
}
}
brelse(new_bh);
new_bh = NULL;
}
/*
* Like most other Unix systems, set the ctime for inodes on a
* rename.
*/
old_inode->i_ctime = ext4_current_time(old_inode);
ext4_mark_inode_dirty(handle, old_inode);
old.inode->i_ctime = ext4_current_time(old.inode);
ext4_mark_inode_dirty(handle, old.inode);
/*
* ok, that's it
*/
if (le32_to_cpu(old_de->inode) != old_inode->i_ino ||
old_de->name_len != old_dentry->d_name.len ||
strncmp(old_de->name, old_dentry->d_name.name, old_de->name_len) ||
(retval = ext4_delete_entry(handle, old_dir,
old_de, old_bh)) == -ENOENT) {
/* old_de could have moved from under us during htree split, so
* make sure that we are deleting the right entry. We might
* also be pointing to a stale entry in the unused part of
* old_bh so just checking inum and the name isn't enough. */
struct buffer_head *old_bh2;
struct ext4_dir_entry_2 *old_de2;
ext4_rename_delete(handle, &old);
old_bh2 = ext4_find_entry(old_dir, &old_dentry->d_name,
&old_de2, NULL);
if (old_bh2) {
retval = ext4_delete_entry(handle, old_dir,
old_de2, old_bh2);
brelse(old_bh2);
}
if (new.inode) {
ext4_dec_count(handle, new.inode);
new.inode->i_ctime = ext4_current_time(new.inode);
}
if (retval) {
ext4_warning(old_dir->i_sb,
"Deleting old file (%lu), %d, error=%d",
old_dir->i_ino, old_dir->i_nlink, retval);
}
if (new_inode) {
ext4_dec_count(handle, new_inode);
new_inode->i_ctime = ext4_current_time(new_inode);
}
old_dir->i_ctime = old_dir->i_mtime = ext4_current_time(old_dir);
ext4_update_dx_flag(old_dir);
if (dir_bh) {
parent_de->inode = cpu_to_le32(new_dir->i_ino);
BUFFER_TRACE(dir_bh, "call ext4_handle_dirty_metadata");
if (!inlined) {
if (is_dx(old_inode)) {
retval = ext4_handle_dirty_dx_node(handle,
old_inode,
dir_bh);
} else {
retval = ext4_handle_dirty_dirent_node(handle,
old_inode, dir_bh);
}
} else {
retval = ext4_mark_inode_dirty(handle, old_inode);
}
if (retval) {
ext4_std_error(old_dir->i_sb, retval);
old.dir->i_ctime = old.dir->i_mtime = ext4_current_time(old.dir);
ext4_update_dx_flag(old.dir);
if (old.dir_bh) {
retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
if (retval)
goto end_rename;
}
ext4_dec_count(handle, old_dir);
if (new_inode) {
ext4_dec_count(handle, old.dir);
if (new.inode) {
/* checked empty_dir above, can't have another parent,
* ext4_dec_count() won't work for many-linked dirs */
clear_nlink(new_inode);
clear_nlink(new.inode);
} else {
ext4_inc_count(handle, new_dir);
ext4_update_dx_flag(new_dir);
ext4_mark_inode_dirty(handle, new_dir);
ext4_inc_count(handle, new.dir);
ext4_update_dx_flag(new.dir);
ext4_mark_inode_dirty(handle, new.dir);
}
}
ext4_mark_inode_dirty(handle, old_dir);
if (new_inode) {
ext4_mark_inode_dirty(handle, new_inode);
if (!new_inode->i_nlink)
ext4_orphan_add(handle, new_inode);
ext4_mark_inode_dirty(handle, old.dir);
if (new.inode) {
ext4_mark_inode_dirty(handle, new.inode);
if (!new.inode->i_nlink)
ext4_orphan_add(handle, new.inode);
}
retval = 0;
end_rename:
brelse(dir_bh);
brelse(old_bh);
brelse(new_bh);
brelse(old.dir_bh);
brelse(old.bh);
brelse(new.bh);
if (handle)
ext4_journal_stop(handle);
return retval;
}
static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
handle_t *handle = NULL;
struct ext4_renament old = {
.dir = old_dir,
.dentry = old_dentry,
.inode = old_dentry->d_inode,
};
struct ext4_renament new = {
.dir = new_dir,
.dentry = new_dentry,
.inode = new_dentry->d_inode,
};
u8 new_file_type;
int retval;
dquot_initialize(old.dir);
dquot_initialize(new.dir);
old.bh = ext4_find_entry(old.dir, &old.dentry->d_name,
&old.de, &old.inlined);
/*
* Check for inode number is _not_ due to possible IO errors.
* We might rmdir the source, keep it as pwd of some process
* and merrily kill the link to whatever was created under the
* same name. Goodbye sticky bit ;-<
*/
retval = -ENOENT;
if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
goto end_rename;
new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
&new.de, &new.inlined);
/* RENAME_EXCHANGE case: old *and* new must both exist */
if (!new.bh || le32_to_cpu(new.de->inode) != new.inode->i_ino)
goto end_rename;
handle = ext4_journal_start(old.dir, EXT4_HT_DIR,
(2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2));
if (IS_ERR(handle))
return PTR_ERR(handle);
if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
ext4_handle_sync(handle);
if (S_ISDIR(old.inode->i_mode)) {
old.is_dir = true;
retval = ext4_rename_dir_prepare(handle, &old);
if (retval)
goto end_rename;
}
if (S_ISDIR(new.inode->i_mode)) {
new.is_dir = true;
retval = ext4_rename_dir_prepare(handle, &new);
if (retval)
goto end_rename;
}
/*
* Other than the special case of overwriting a directory, parents'
* nlink only needs to be modified if this is a cross directory rename.
*/
if (old.dir != new.dir && old.is_dir != new.is_dir) {
old.dir_nlink_delta = old.is_dir ? -1 : 1;
new.dir_nlink_delta = -old.dir_nlink_delta;
retval = -EMLINK;
if ((old.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(old.dir)) ||
(new.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(new.dir)))
goto end_rename;
}
new_file_type = new.de->file_type;
retval = ext4_setent(handle, &new, old.inode->i_ino, old.de->file_type);
if (retval)
goto end_rename;
retval = ext4_setent(handle, &old, new.inode->i_ino, new_file_type);
if (retval)
goto end_rename;
/*
* Like most other Unix systems, set the ctime for inodes on a
* rename.
*/
old.inode->i_ctime = ext4_current_time(old.inode);
new.inode->i_ctime = ext4_current_time(new.inode);
ext4_mark_inode_dirty(handle, old.inode);
ext4_mark_inode_dirty(handle, new.inode);
if (old.dir_bh) {
retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
if (retval)
goto end_rename;
}
if (new.dir_bh) {
retval = ext4_rename_dir_finish(handle, &new, old.dir->i_ino);
if (retval)
goto end_rename;
}
ext4_update_dir_count(handle, &old);
ext4_update_dir_count(handle, &new);
retval = 0;
end_rename:
brelse(old.dir_bh);
brelse(new.dir_bh);
brelse(old.bh);
brelse(new.bh);
if (handle)
ext4_journal_stop(handle);
return retval;
}
static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
return -EINVAL;
if (flags & RENAME_EXCHANGE) {
return ext4_cross_rename(old_dir, old_dentry,
new_dir, new_dentry);
}
/*
* Existence checking was done by the VFS, otherwise "RENAME_NOREPLACE"
* is equivalent to regular rename.
*/
return ext4_rename(old_dir, old_dentry, new_dir, new_dentry);
}
/*
* directories can handle most operations...
*/
@ -3218,6 +3435,7 @@ const struct inode_operations ext4_dir_inode_operations = {
.mknod = ext4_mknod,
.tmpfile = ext4_tmpfile,
.rename = ext4_rename,
.rename2 = ext4_rename2,
.setattr = ext4_setattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,

25
fs/inode.c
View file

@ -944,24 +944,22 @@ EXPORT_SYMBOL(unlock_new_inode);
/**
* lock_two_nondirectories - take two i_mutexes on non-directory objects
*
* Lock any non-NULL argument that is not a directory.
* Zero, one or two objects may be locked by this function.
*
* @inode1: first inode to lock
* @inode2: second inode to lock
*/
void lock_two_nondirectories(struct inode *inode1, struct inode *inode2)
{
WARN_ON_ONCE(S_ISDIR(inode1->i_mode));
if (inode1 == inode2 || !inode2) {
mutex_lock(&inode1->i_mutex);
return;
}
WARN_ON_ONCE(S_ISDIR(inode2->i_mode));
if (inode1 < inode2) {
if (inode1 > inode2)
swap(inode1, inode2);
if (inode1 && !S_ISDIR(inode1->i_mode))
mutex_lock(&inode1->i_mutex);
if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1)
mutex_lock_nested(&inode2->i_mutex, I_MUTEX_NONDIR2);
} else {
mutex_lock(&inode2->i_mutex);
mutex_lock_nested(&inode1->i_mutex, I_MUTEX_NONDIR2);
}
}
EXPORT_SYMBOL(lock_two_nondirectories);
@ -972,8 +970,9 @@ EXPORT_SYMBOL(lock_two_nondirectories);
*/
void unlock_two_nondirectories(struct inode *inode1, struct inode *inode2)
{
mutex_unlock(&inode1->i_mutex);
if (inode2 && inode2 != inode1)
if (inode1 && !S_ISDIR(inode1->i_mode))
mutex_unlock(&inode1->i_mutex);
if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1)
mutex_unlock(&inode2->i_mutex);
}
EXPORT_SYMBOL(unlock_two_nondirectories);

351
fs/namei.c
View file

@ -1796,7 +1796,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
if (err)
return err;
}
if (!d_is_directory(nd->path.dentry)) {
if (!d_can_lookup(nd->path.dentry)) {
err = -ENOTDIR;
break;
}
@ -1817,7 +1817,7 @@ static int path_init(int dfd, const char *name, unsigned int flags,
struct dentry *root = nd->root.dentry;
struct inode *inode = root->d_inode;
if (*name) {
if (!d_is_directory(root))
if (!d_can_lookup(root))
return -ENOTDIR;
retval = inode_permission(inode, MAY_EXEC);
if (retval)
@ -1873,7 +1873,7 @@ static int path_init(int dfd, const char *name, unsigned int flags,
dentry = f.file->f_path.dentry;
if (*name) {
if (!d_is_directory(dentry)) {
if (!d_can_lookup(dentry)) {
fdput(f);
return -ENOTDIR;
}
@ -1955,7 +1955,7 @@ static int path_lookupat(int dfd, const char *name,
err = complete_walk(nd);
if (!err && nd->flags & LOOKUP_DIRECTORY) {
if (!d_is_directory(nd->path.dentry)) {
if (!d_can_lookup(nd->path.dentry)) {
path_put(&nd->path);
err = -ENOTDIR;
}
@ -2414,11 +2414,11 @@ static int may_delete(struct inode *dir, struct dentry *victim, bool isdir)
IS_IMMUTABLE(inode) || IS_SWAPFILE(inode))
return -EPERM;
if (isdir) {
if (!d_is_directory(victim) && !d_is_autodir(victim))
if (!d_is_dir(victim))
return -ENOTDIR;
if (IS_ROOT(victim))
return -EBUSY;
} else if (d_is_directory(victim) || d_is_autodir(victim))
} else if (d_is_dir(victim))
return -EISDIR;
if (IS_DEADDIR(dir))
return -ENOENT;
@ -3016,11 +3016,10 @@ static int do_last(struct nameidata *nd, struct path *path,
}
audit_inode(name, nd->path.dentry, 0);
error = -EISDIR;
if ((open_flag & O_CREAT) &&
(d_is_directory(nd->path.dentry) || d_is_autodir(nd->path.dentry)))
if ((open_flag & O_CREAT) && d_is_dir(nd->path.dentry))
goto out;
error = -ENOTDIR;
if ((nd->flags & LOOKUP_DIRECTORY) && !d_is_directory(nd->path.dentry))
if ((nd->flags & LOOKUP_DIRECTORY) && !d_can_lookup(nd->path.dentry))
goto out;
if (!S_ISREG(nd->inode->i_mode))
will_truncate = false;
@ -3744,7 +3743,7 @@ static long do_unlinkat(int dfd, const char __user *pathname)
slashes:
if (d_is_negative(dentry))
error = -ENOENT;
else if (d_is_directory(dentry) || d_is_autodir(dentry))
else if (d_is_dir(dentry))
error = -EISDIR;
else
error = -ENOTDIR;
@ -3974,7 +3973,28 @@ SYSCALL_DEFINE2(link, const char __user *, oldname, const char __user *, newname
return sys_linkat(AT_FDCWD, oldname, AT_FDCWD, newname, 0);
}
/*
/**
* vfs_rename - rename a filesystem object
* @old_dir: parent of source
* @old_dentry: source
* @new_dir: parent of destination
* @new_dentry: destination
* @delegated_inode: returns an inode needing a delegation break
* @flags: rename flags
*
* The caller must hold multiple mutexes--see lock_rename()).
*
* If vfs_rename discovers a delegation in need of breaking at either
* the source or destination, it will return -EWOULDBLOCK and return a
* reference to the inode in delegated_inode. The caller should then
* break the delegation and retry. Because breaking a delegation may
* take a long time, the caller should drop all locks before doing
* so.
*
* Alternatively, a caller may pass NULL for delegated_inode. This may
* be appropriate for callers that expect the underlying filesystem not
* to be NFS exported.
*
* 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:
@ -4002,163 +4022,139 @@ SYSCALL_DEFINE2(link, const char __user *, oldname, const char __user *, newname
* ->i_mutex on parents, which works but leads to some truly excessive
* locking].
*/
static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
int error = 0;
struct inode *target = new_dentry->d_inode;
unsigned max_links = new_dir->i_sb->s_max_links;
/*
* If we are going to change the parent - check write permissions,
* we'll need to flip '..'.
*/
if (new_dir != old_dir) {
error = inode_permission(old_dentry->d_inode, MAY_WRITE);
if (error)
return error;
}
error = security_inode_rename(old_dir, old_dentry, new_dir, new_dentry);
if (error)
return error;
dget(new_dentry);
if (target)
mutex_lock(&target->i_mutex);
error = -EBUSY;
if (d_mountpoint(old_dentry) || d_mountpoint(new_dentry))
goto out;
error = -EMLINK;
if (max_links && !target && new_dir != old_dir &&
new_dir->i_nlink >= max_links)
goto out;
if (target)
shrink_dcache_parent(new_dentry);
error = old_dir->i_op->rename(old_dir, old_dentry, new_dir, new_dentry);
if (error)
goto out;
if (target) {
target->i_flags |= S_DEAD;
dont_mount(new_dentry);
}
out:
if (target)
mutex_unlock(&target->i_mutex);
dput(new_dentry);
if (!error)
if (!(old_dir->i_sb->s_type->fs_flags & FS_RENAME_DOES_D_MOVE))
d_move(old_dentry,new_dentry);
return error;
}
static int vfs_rename_other(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
struct inode **delegated_inode)
{
struct inode *target = new_dentry->d_inode;
struct inode *source = old_dentry->d_inode;
int error;
error = security_inode_rename(old_dir, old_dentry, new_dir, new_dentry);
if (error)
return error;
dget(new_dentry);
lock_two_nondirectories(source, target);
error = -EBUSY;
if (d_mountpoint(old_dentry)||d_mountpoint(new_dentry))
goto out;
error = try_break_deleg(source, delegated_inode);
if (error)
goto out;
if (target) {
error = try_break_deleg(target, delegated_inode);
if (error)
goto out;
}
error = old_dir->i_op->rename(old_dir, old_dentry, new_dir, new_dentry);
if (error)
goto out;
if (target)
dont_mount(new_dentry);
if (!(old_dir->i_sb->s_type->fs_flags & FS_RENAME_DOES_D_MOVE))
d_move(old_dentry, new_dentry);
out:
unlock_two_nondirectories(source, target);
dput(new_dentry);
return error;
}
/**
* vfs_rename - rename a filesystem object
* @old_dir: parent of source
* @old_dentry: source
* @new_dir: parent of destination
* @new_dentry: destination
* @delegated_inode: returns an inode needing a delegation break
*
* The caller must hold multiple mutexes--see lock_rename()).
*
* If vfs_rename discovers a delegation in need of breaking at either
* the source or destination, it will return -EWOULDBLOCK and return a
* reference to the inode in delegated_inode. The caller should then
* break the delegation and retry. Because breaking a delegation may
* take a long time, the caller should drop all locks before doing
* so.
*
* Alternatively, a caller may pass NULL for delegated_inode. This may
* be appropriate for callers that expect the underlying filesystem not
* to be NFS exported.
*/
int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
struct inode **delegated_inode)
struct inode **delegated_inode, unsigned int flags)
{
int error;
int is_dir = d_is_directory(old_dentry) || d_is_autodir(old_dentry);
bool is_dir = d_is_dir(old_dentry);
const unsigned char *old_name;
struct inode *source = old_dentry->d_inode;
struct inode *target = new_dentry->d_inode;
bool new_is_dir = false;
unsigned max_links = new_dir->i_sb->s_max_links;
if (source == target)
return 0;
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)
if (!target) {
error = may_create(new_dir, new_dentry);
else
error = may_delete(new_dir, new_dentry, is_dir);
} else {
new_is_dir = d_is_dir(new_dentry);
if (!(flags & RENAME_EXCHANGE))
error = may_delete(new_dir, new_dentry, is_dir);
else
error = may_delete(new_dir, new_dentry, new_is_dir);
}
if (error)
return error;
if (!old_dir->i_op->rename)
return -EPERM;
old_name = fsnotify_oldname_init(old_dentry->d_name.name);
if (flags && !old_dir->i_op->rename2)
return -EINVAL;
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,delegated_inode);
if (!error)
/*
* If we are going to change the parent - check write permissions,
* we'll need to flip '..'.
*/
if (new_dir != old_dir) {
if (is_dir) {
error = inode_permission(source, MAY_WRITE);
if (error)
return error;
}
if ((flags & RENAME_EXCHANGE) && new_is_dir) {
error = inode_permission(target, MAY_WRITE);
if (error)
return error;
}
}
error = security_inode_rename(old_dir, old_dentry, new_dir, new_dentry,
flags);
if (error)
return error;
old_name = fsnotify_oldname_init(old_dentry->d_name.name);
dget(new_dentry);
if (!is_dir || (flags & RENAME_EXCHANGE))
lock_two_nondirectories(source, target);
else if (target)
mutex_lock(&target->i_mutex);
error = -EBUSY;
if (d_mountpoint(old_dentry) || d_mountpoint(new_dentry))
goto out;
if (max_links && new_dir != old_dir) {
error = -EMLINK;
if (is_dir && !new_is_dir && new_dir->i_nlink >= max_links)
goto out;
if ((flags & RENAME_EXCHANGE) && !is_dir && new_is_dir &&
old_dir->i_nlink >= max_links)
goto out;
}
if (is_dir && !(flags & RENAME_EXCHANGE) && target)
shrink_dcache_parent(new_dentry);
if (!is_dir) {
error = try_break_deleg(source, delegated_inode);
if (error)
goto out;
}
if (target && !new_is_dir) {
error = try_break_deleg(target, delegated_inode);
if (error)
goto out;
}
if (!flags) {
error = old_dir->i_op->rename(old_dir, old_dentry,
new_dir, new_dentry);
} else {
error = old_dir->i_op->rename2(old_dir, old_dentry,
new_dir, new_dentry, flags);
}
if (error)
goto out;
if (!(flags & RENAME_EXCHANGE) && target) {
if (is_dir)
target->i_flags |= S_DEAD;
dont_mount(new_dentry);
}
if (!(old_dir->i_sb->s_type->fs_flags & FS_RENAME_DOES_D_MOVE)) {
if (!(flags & RENAME_EXCHANGE))
d_move(old_dentry, new_dentry);
else
d_exchange(old_dentry, new_dentry);
}
out:
if (!is_dir || (flags & RENAME_EXCHANGE))
unlock_two_nondirectories(source, target);
else if (target)
mutex_unlock(&target->i_mutex);
dput(new_dentry);
if (!error) {
fsnotify_move(old_dir, new_dir, old_name, is_dir,
new_dentry->d_inode, old_dentry);
!(flags & RENAME_EXCHANGE) ? target : NULL, old_dentry);
if (flags & RENAME_EXCHANGE) {
fsnotify_move(new_dir, old_dir, old_dentry->d_name.name,
new_is_dir, NULL, new_dentry);
}
}
fsnotify_oldname_free(old_name);
return error;
}
SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
int, newdfd, const char __user *, newname)
SYSCALL_DEFINE5(renameat2, int, olddfd, const char __user *, oldname,
int, newdfd, const char __user *, newname, unsigned int, flags)
{
struct dentry *old_dir, *new_dir;
struct dentry *old_dentry, *new_dentry;
@ -4170,6 +4166,13 @@ SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
unsigned int lookup_flags = 0;
bool should_retry = false;
int error;
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
return -EINVAL;
if ((flags & RENAME_NOREPLACE) && (flags & RENAME_EXCHANGE))
return -EINVAL;
retry:
from = user_path_parent(olddfd, oldname, &oldnd, lookup_flags);
if (IS_ERR(from)) {
@ -4193,6 +4196,8 @@ SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
goto exit2;
new_dir = newnd.path.dentry;
if (flags & RENAME_NOREPLACE)
error = -EEXIST;
if (newnd.last_type != LAST_NORM)
goto exit2;
@ -4202,7 +4207,8 @@ SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
oldnd.flags &= ~LOOKUP_PARENT;
newnd.flags &= ~LOOKUP_PARENT;
newnd.flags |= LOOKUP_RENAME_TARGET;
if (!(flags & RENAME_EXCHANGE))
newnd.flags |= LOOKUP_RENAME_TARGET;
retry_deleg:
trap = lock_rename(new_dir, old_dir);
@ -4215,34 +4221,49 @@ SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
error = -ENOENT;
if (d_is_negative(old_dentry))
goto exit4;
/* unless the source is a directory trailing slashes give -ENOTDIR */
if (!d_is_directory(old_dentry) && !d_is_autodir(old_dentry)) {
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;
new_dentry = lookup_hash(&newnd);
error = PTR_ERR(new_dentry);
if (IS_ERR(new_dentry))
goto exit4;
error = -EEXIST;
if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry))
goto exit5;
if (flags & RENAME_EXCHANGE) {
error = -ENOENT;
if (d_is_negative(new_dentry))
goto exit5;
if (!d_is_dir(new_dentry)) {
error = -ENOTDIR;
if (newnd.last.name[newnd.last.len])
goto exit5;
}
}
/* unless the source is a directory trailing slashes give -ENOTDIR */
if (!d_is_dir(old_dentry)) {
error = -ENOTDIR;
if (oldnd.last.name[oldnd.last.len])
goto exit5;
if (!(flags & RENAME_EXCHANGE) && newnd.last.name[newnd.last.len])
goto exit5;
}
/* source should not be ancestor of target */
error = -EINVAL;
if (old_dentry == trap)
goto exit5;
/* target should not be an ancestor of source */
error = -ENOTEMPTY;
if (!(flags & RENAME_EXCHANGE))
error = -ENOTEMPTY;
if (new_dentry == trap)
goto exit5;
error = security_path_rename(&oldnd.path, old_dentry,
&newnd.path, new_dentry);
&newnd.path, new_dentry, flags);
if (error)
goto exit5;
error = vfs_rename(old_dir->d_inode, old_dentry,
new_dir->d_inode, new_dentry,
&delegated_inode);
new_dir->d_inode, new_dentry,
&delegated_inode, flags);
exit5:
dput(new_dentry);
exit4:
@ -4272,9 +4293,15 @@ SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
return error;
}
SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
int, newdfd, const char __user *, newname)
{
return sys_renameat2(olddfd, oldname, newdfd, newname, 0);
}
SYSCALL_DEFINE2(rename, const char __user *, oldname, const char __user *, newname)
{
return sys_renameat(AT_FDCWD, oldname, AT_FDCWD, newname);
return sys_renameat2(AT_FDCWD, oldname, AT_FDCWD, newname, 0);
}
int vfs_readlink(struct dentry *dentry, char __user *buffer, int buflen, const char *link)

2
fs/nfsd/vfs.c
View file

@ -1694,7 +1694,7 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry)
goto out_dput_new;
host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL);
host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL, 0);
if (!host_err) {
host_err = commit_metadata(tfhp);
if (!host_err)

8
include/linux/dcache.h
View file

@ -308,6 +308,7 @@ extern void dentry_update_name_case(struct dentry *, struct qstr *);
/* used for rename() and baskets */
extern void d_move(struct dentry *, struct dentry *);
extern void d_exchange(struct dentry *, struct dentry *);
extern struct dentry *d_ancestor(struct dentry *, struct dentry *);
/* appendix may either be NULL or be used for transname suffixes */
@ -429,7 +430,7 @@ static inline unsigned __d_entry_type(const struct dentry *dentry)
return dentry->d_flags & DCACHE_ENTRY_TYPE;
}
static inline bool d_is_directory(const struct dentry *dentry)
static inline bool d_can_lookup(const struct dentry *dentry)
{
return __d_entry_type(dentry) == DCACHE_DIRECTORY_TYPE;
}
@ -439,6 +440,11 @@ static inline bool d_is_autodir(const struct dentry *dentry)
return __d_entry_type(dentry) == DCACHE_AUTODIR_TYPE;
}
static inline bool d_is_dir(const struct dentry *dentry)
{
return d_can_lookup(dentry) || d_is_autodir(dentry);
}
static inline bool d_is_symlink(const struct dentry *dentry)
{
return __d_entry_type(dentry) == DCACHE_SYMLINK_TYPE;

4
include/linux/fs.h
View file

@ -1461,7 +1461,7 @@ extern int vfs_symlink(struct inode *, struct dentry *, const char *);
extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **);
extern int vfs_rmdir(struct inode *, struct dentry *);
extern int vfs_unlink(struct inode *, struct dentry *, struct inode **);
extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **);
extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int);
/*
* VFS dentry helper functions.
@ -1572,6 +1572,8 @@ struct inode_operations {
int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
int (*rename) (struct inode *, struct dentry *,
struct inode *, struct dentry *);
int (*rename2) (struct inode *, struct dentry *,
struct inode *, struct dentry *, unsigned int);
int (*setattr) (struct dentry *, struct iattr *);
int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);

12
include/linux/security.h
View file

@ -1793,7 +1793,8 @@ int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
int security_inode_rmdir(struct inode *dir, struct dentry *dentry);
int security_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev);
int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry);
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags);
int security_inode_readlink(struct dentry *dentry);
int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd);
int security_inode_permission(struct inode *inode, int mask);
@ -2161,7 +2162,8 @@ static inline int security_inode_mknod(struct inode *dir,
static inline int security_inode_rename(struct inode *old_dir,
struct dentry *old_dentry,
struct inode *new_dir,
struct dentry *new_dentry)
struct dentry *new_dentry,
unsigned int flags)
{
return 0;
}
@ -2955,7 +2957,8 @@ int security_path_symlink(struct path *dir, struct dentry *dentry,
int security_path_link(struct dentry *old_dentry, struct path *new_dir,
struct dentry *new_dentry);
int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
struct path *new_dir, struct dentry *new_dentry);
struct path *new_dir, struct dentry *new_dentry,
unsigned int flags);
int security_path_chmod(struct path *path, umode_t mode);
int security_path_chown(struct path *path, kuid_t uid, kgid_t gid);
int security_path_chroot(struct path *path);
@ -3003,7 +3006,8 @@ static inline int security_path_link(struct dentry *old_dentry,
static inline int security_path_rename(struct path *old_dir,
struct dentry *old_dentry,
struct path *new_dir,
struct dentry *new_dentry)
struct dentry *new_dentry,
unsigned int flags)
{
return 0;
}

3
include/uapi/linux/fs.h
View file

@ -35,6 +35,9 @@
#define SEEK_HOLE 4 /* seek to the next hole */
#define SEEK_MAX SEEK_HOLE
#define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */
#define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */
struct fstrim_range {
__u64 start;
__u64 len;

22
security/security.c
View file

@ -433,11 +433,20 @@ int security_path_link(struct dentry *old_dentry, struct path *new_dir,
}
int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
struct path *new_dir, struct dentry *new_dentry)
struct path *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
if (unlikely(IS_PRIVATE(old_dentry->d_inode) ||
(new_dentry->d_inode && IS_PRIVATE(new_dentry->d_inode))))
return 0;
if (flags & RENAME_EXCHANGE) {
int err = security_ops->path_rename(new_dir, new_dentry,
old_dir, old_dentry);
if (err)
return err;
}
return security_ops->path_rename(old_dir, old_dentry, new_dir,
new_dentry);
}
@ -524,11 +533,20 @@ int security_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
}
int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
if (unlikely(IS_PRIVATE(old_dentry->d_inode) ||
(new_dentry->d_inode && IS_PRIVATE(new_dentry->d_inode))))
return 0;
if (flags & RENAME_EXCHANGE) {
int err = security_ops->inode_rename(new_dir, new_dentry,
old_dir, old_dentry);
if (err)
return err;
}
return security_ops->inode_rename(old_dir, old_dentry,
new_dir, new_dentry);
}