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-rw-r--r--fs/ubifs/dir.c248
1 files changed, 227 insertions, 21 deletions
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 4b86d3a738e1..c8f60df2733e 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -301,6 +301,95 @@ out_budg:
return err;
}
+static int do_tmpfile(struct inode *dir, struct dentry *dentry,
+ umode_t mode, struct inode **whiteout)
+{
+ struct inode *inode;
+ struct ubifs_info *c = dir->i_sb->s_fs_info;
+ struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1};
+ struct ubifs_budget_req ino_req = { .dirtied_ino = 1 };
+ struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir);
+ int err, instantiated = 0;
+
+ /*
+ * Budget request settings: new dirty inode, new direntry,
+ * budget for dirtied inode will be released via writeback.
+ */
+
+ dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
+ dentry, mode, dir->i_ino);
+
+ err = ubifs_budget_space(c, &req);
+ if (err)
+ return err;
+
+ err = ubifs_budget_space(c, &ino_req);
+ if (err) {
+ ubifs_release_budget(c, &req);
+ return err;
+ }
+
+ inode = ubifs_new_inode(c, dir, mode);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
+ goto out_budg;
+ }
+ ui = ubifs_inode(inode);
+
+ if (whiteout) {
+ init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
+ ubifs_assert(inode->i_op == &ubifs_file_inode_operations);
+ }
+
+ err = ubifs_init_security(dir, inode, &dentry->d_name);
+ if (err)
+ goto out_inode;
+
+ mutex_lock(&ui->ui_mutex);
+ insert_inode_hash(inode);
+
+ if (whiteout) {
+ mark_inode_dirty(inode);
+ drop_nlink(inode);
+ *whiteout = inode;
+ } else {
+ d_tmpfile(dentry, inode);
+ }
+ ubifs_assert(ui->dirty);
+
+ instantiated = 1;
+ mutex_unlock(&ui->ui_mutex);
+
+ mutex_lock(&dir_ui->ui_mutex);
+ err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0);
+ if (err)
+ goto out_cancel;
+ mutex_unlock(&dir_ui->ui_mutex);
+
+ ubifs_release_budget(c, &req);
+
+ return 0;
+
+out_cancel:
+ mutex_unlock(&dir_ui->ui_mutex);
+out_inode:
+ make_bad_inode(inode);
+ if (!instantiated)
+ iput(inode);
+out_budg:
+ ubifs_release_budget(c, &req);
+ if (!instantiated)
+ ubifs_release_budget(c, &ino_req);
+ ubifs_err(c, "cannot create temporary file, error %d", err);
+ return err;
+}
+
+static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry,
+ umode_t mode)
+{
+ return do_tmpfile(dir, dentry, mode, NULL);
+}
+
/**
* vfs_dent_type - get VFS directory entry type.
* @type: UBIFS directory entry type
@@ -927,37 +1016,43 @@ out_budg:
}
/**
- * lock_3_inodes - a wrapper for locking three UBIFS inodes.
+ * lock_4_inodes - a wrapper for locking three UBIFS inodes.
* @inode1: first inode
* @inode2: second inode
* @inode3: third inode
+ * @inode4: fouth inode
*
* This function is used for 'ubifs_rename()' and @inode1 may be the same as
- * @inode2 whereas @inode3 may be %NULL.
+ * @inode2 whereas @inode3 and @inode4 may be %NULL.
*
* We do not implement any tricks to guarantee strict lock ordering, because
* VFS has already done it for us on the @i_mutex. So this is just a simple
* wrapper function.
*/
-static void lock_3_inodes(struct inode *inode1, struct inode *inode2,
- struct inode *inode3)
+static void lock_4_inodes(struct inode *inode1, struct inode *inode2,
+ struct inode *inode3, struct inode *inode4)
{
mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
if (inode2 != inode1)
mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
if (inode3)
mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3);
+ if (inode4)
+ mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4);
}
/**
- * unlock_3_inodes - a wrapper for unlocking three UBIFS inodes for rename.
+ * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename.
* @inode1: first inode
* @inode2: second inode
* @inode3: third inode
+ * @inode4: fouth inode
*/
-static void unlock_3_inodes(struct inode *inode1, struct inode *inode2,
- struct inode *inode3)
+static void unlock_4_inodes(struct inode *inode1, struct inode *inode2,
+ struct inode *inode3, struct inode *inode4)
{
+ if (inode4)
+ mutex_unlock(&ubifs_inode(inode4)->ui_mutex);
if (inode3)
mutex_unlock(&ubifs_inode(inode3)->ui_mutex);
if (inode1 != inode2)
@@ -966,12 +1061,15 @@ static void unlock_3_inodes(struct inode *inode1, struct inode *inode2,
}
static int ubifs_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)
{
struct ubifs_info *c = old_dir->i_sb->s_fs_info;
struct inode *old_inode = d_inode(old_dentry);
struct inode *new_inode = d_inode(new_dentry);
+ struct inode *whiteout = NULL;
struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
+ struct ubifs_inode *whiteout_ui = NULL;
int err, release, sync = 0, move = (new_dir != old_dir);
int is_dir = S_ISDIR(old_inode->i_mode);
int unlink = !!new_inode;
@@ -984,6 +1082,9 @@ static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct timespec time;
unsigned int uninitialized_var(saved_nlink);
+ if (flags & ~RENAME_NOREPLACE)
+ return -EINVAL;
+
/*
* Budget request settings: deletion direntry, new direntry, removing
* the old inode, and changing old and new parent directory inodes.
@@ -993,15 +1094,13 @@ static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
* separately.
*/
- dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu",
+ dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x",
old_dentry, old_inode->i_ino, old_dir->i_ino,
- new_dentry, new_dir->i_ino);
- ubifs_assert(inode_is_locked(old_dir));
- ubifs_assert(inode_is_locked(new_dir));
+ new_dentry, new_dir->i_ino, flags);
+
if (unlink)
ubifs_assert(inode_is_locked(new_inode));
-
if (unlink && is_dir) {
err = check_dir_empty(c, new_inode);
if (err)
@@ -1017,7 +1116,32 @@ static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
return err;
}
- lock_3_inodes(old_dir, new_dir, new_inode);
+ if (flags & RENAME_WHITEOUT) {
+ union ubifs_dev_desc *dev = NULL;
+
+ dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
+ if (!dev) {
+ ubifs_release_budget(c, &req);
+ ubifs_release_budget(c, &ino_req);
+ return -ENOMEM;
+ }
+
+ err = do_tmpfile(old_dir, old_dentry, S_IFCHR | WHITEOUT_MODE, &whiteout);
+ if (err) {
+ ubifs_release_budget(c, &req);
+ ubifs_release_budget(c, &ino_req);
+ kfree(dev);
+ return err;
+ }
+
+ whiteout->i_state |= I_LINKABLE;
+ whiteout_ui = ubifs_inode(whiteout);
+ whiteout_ui->data = dev;
+ whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0));
+ ubifs_assert(!whiteout_ui->dirty);
+ }
+
+ lock_4_inodes(old_dir, new_dir, new_inode, whiteout);
/*
* Like most other Unix systems, set the @i_ctime for inodes on a
@@ -1087,12 +1211,34 @@ static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (unlink && IS_SYNC(new_inode))
sync = 1;
}
- err = ubifs_jnl_rename(c, old_dir, old_dentry, new_dir, new_dentry,
+
+ if (whiteout) {
+ struct ubifs_budget_req wht_req = { .dirtied_ino = 1,
+ .dirtied_ino_d = \
+ ALIGN(ubifs_inode(whiteout)->data_len, 8) };
+
+ err = ubifs_budget_space(c, &wht_req);
+ if (err) {
+ ubifs_release_budget(c, &req);
+ ubifs_release_budget(c, &ino_req);
+ kfree(whiteout_ui->data);
+ whiteout_ui->data_len = 0;
+ iput(whiteout);
+ return err;
+ }
+
+ inc_nlink(whiteout);
+ mark_inode_dirty(whiteout);
+ whiteout->i_state &= ~I_LINKABLE;
+ iput(whiteout);
+ }
+
+ err = ubifs_jnl_rename(c, old_dir, old_dentry, new_dir, new_dentry, whiteout,
sync);
if (err)
goto out_cancel;
- unlock_3_inodes(old_dir, new_dir, new_inode);
+ unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
ubifs_release_budget(c, &req);
mutex_lock(&old_inode_ui->ui_mutex);
@@ -1125,12 +1271,74 @@ out_cancel:
inc_nlink(old_dir);
}
}
- unlock_3_inodes(old_dir, new_dir, new_inode);
+ if (whiteout) {
+ drop_nlink(whiteout);
+ iput(whiteout);
+ }
+ unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
ubifs_release_budget(c, &ino_req);
ubifs_release_budget(c, &req);
return err;
}
+static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
+{
+ struct ubifs_info *c = old_dir->i_sb->s_fs_info;
+ struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
+ .dirtied_ino = 2 };
+ int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
+ struct inode *fst_inode = d_inode(old_dentry);
+ struct inode *snd_inode = d_inode(new_dentry);
+ struct timespec time;
+ int err;
+
+ ubifs_assert(fst_inode && snd_inode);
+
+ lock_4_inodes(old_dir, new_dir, NULL, NULL);
+
+ time = ubifs_current_time(old_dir);
+ fst_inode->i_ctime = time;
+ snd_inode->i_ctime = time;
+ old_dir->i_mtime = old_dir->i_ctime = time;
+ new_dir->i_mtime = new_dir->i_ctime = time;
+
+ if (old_dir != new_dir) {
+ if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) {
+ inc_nlink(new_dir);
+ drop_nlink(old_dir);
+ }
+ else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) {
+ drop_nlink(new_dir);
+ inc_nlink(old_dir);
+ }
+ }
+
+ err = ubifs_jnl_xrename(c, old_dir, old_dentry, new_dir, new_dentry,
+ sync);
+
+ unlock_4_inodes(old_dir, new_dir, NULL, NULL);
+ ubifs_release_budget(c, &req);
+
+ return err;
+}
+
+static int ubifs_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_WHITEOUT | RENAME_EXCHANGE))
+ return -EINVAL;
+
+ ubifs_assert(inode_is_locked(old_dir));
+ ubifs_assert(inode_is_locked(new_dir));
+
+ if (flags & RENAME_EXCHANGE)
+ return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry);
+
+ return ubifs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
+}
+
int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat)
{
@@ -1179,16 +1387,14 @@ const struct inode_operations ubifs_dir_inode_operations = {
.mkdir = ubifs_mkdir,
.rmdir = ubifs_rmdir,
.mknod = ubifs_mknod,
- .rename = ubifs_rename,
+ .rename = ubifs_rename2,
.setattr = ubifs_setattr,
.getattr = ubifs_getattr,
- .setxattr = generic_setxattr,
- .getxattr = generic_getxattr,
.listxattr = ubifs_listxattr,
- .removexattr = generic_removexattr,
#ifdef CONFIG_UBIFS_ATIME_SUPPORT
.update_time = ubifs_update_time,
#endif
+ .tmpfile = ubifs_tmpfile,
};
const struct file_operations ubifs_dir_operations = {
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.