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-rw-r--r--fs/ubifs/dir.c120
1 files changed, 101 insertions, 19 deletions
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 8460f481eeb9..e0282534f170 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -301,8 +301,8 @@ out_budg:
return err;
}
-static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry,
- umode_t mode)
+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;
@@ -336,14 +336,27 @@ static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry,
}
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);
- d_tmpfile(dentry, 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);
@@ -371,6 +384,12 @@ out_budg:
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
@@ -997,37 +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)
@@ -1036,12 +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;
@@ -1063,15 +1091,18 @@ 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);
+ new_dentry, new_dir->i_ino, flags);
+
+ if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT))
+ return -EINVAL;
+
ubifs_assert(inode_is_locked(old_dir));
ubifs_assert(inode_is_locked(new_dir));
if (unlink)
ubifs_assert(inode_is_locked(new_inode));
-
if (unlink && is_dir) {
err = check_dir_empty(c, new_inode);
if (err)
@@ -1087,7 +1118,32 @@ 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
@@ -1157,12 +1213,34 @@ 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);
@@ -1195,7 +1273,11 @@ 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;
@@ -1249,7 +1331,7 @@ const struct inode_operations ubifs_dir_inode_operations = {
.mkdir = ubifs_mkdir,
.rmdir = ubifs_rmdir,
.mknod = ubifs_mknod,
- .rename = ubifs_rename,
+ .rename2 = ubifs_rename,
.setattr = ubifs_setattr,
.getattr = ubifs_getattr,
.setxattr = generic_setxattr,
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-06-28 10:53:34 +0200