6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chuck Lever <chuck.lever@xxxxxxxxxx> [ Upstream commit d7bde4f27ceef3dc6d72010a20d4da23db835a32 ] simple_empty() and simple_offset_empty() perform the same task. The latter's use as a canary to find bugs has not found any new issues. A subsequent patch will remove the use of the mtree for iterating directory contents, so revert back to using a similar mechanism for determining whether a directory is indeed empty. Only one such mechanism is ever needed. Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx> Link: https://lore.kernel.org/r/20241228175522.1854234-3-cel@xxxxxxxxxx Reviewed-by: Yang Erkun <yangerkun@xxxxxxxxxx> Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx> [ cel: adjusted to apply to origin/linux-6.6.y ] Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/libfs.c | 32 -------------------------------- include/linux/fs.h | 1 - mm/shmem.c | 4 ++-- 3 files changed, 2 insertions(+), 35 deletions(-) --- a/fs/libfs.c +++ b/fs/libfs.c @@ -325,38 +325,6 @@ void simple_offset_remove(struct offset_ } /** - * simple_offset_empty - Check if a dentry can be unlinked - * @dentry: dentry to be tested - * - * Returns 0 if @dentry is a non-empty directory; otherwise returns 1. - */ -int simple_offset_empty(struct dentry *dentry) -{ - struct inode *inode = d_inode(dentry); - struct offset_ctx *octx; - struct dentry *child; - unsigned long index; - int ret = 1; - - if (!inode || !S_ISDIR(inode->i_mode)) - return ret; - - index = DIR_OFFSET_MIN; - octx = inode->i_op->get_offset_ctx(inode); - xa_for_each(&octx->xa, index, child) { - spin_lock(&child->d_lock); - if (simple_positive(child)) { - spin_unlock(&child->d_lock); - ret = 0; - break; - } - spin_unlock(&child->d_lock); - } - - return ret; -} - -/** * simple_offset_rename - handle directory offsets for rename * @old_dir: parent directory of source entry * @old_dentry: dentry of source entry --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3197,7 +3197,6 @@ struct offset_ctx { void simple_offset_init(struct offset_ctx *octx); int simple_offset_add(struct offset_ctx *octx, struct dentry *dentry); void simple_offset_remove(struct offset_ctx *octx, struct dentry *dentry); -int simple_offset_empty(struct dentry *dentry); int simple_offset_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry); int simple_offset_rename_exchange(struct inode *old_dir, --- a/mm/shmem.c +++ b/mm/shmem.c @@ -3368,7 +3368,7 @@ static int shmem_unlink(struct inode *di static int shmem_rmdir(struct inode *dir, struct dentry *dentry) { - if (!simple_offset_empty(dentry)) + if (!simple_empty(dentry)) return -ENOTEMPTY; drop_nlink(d_inode(dentry)); @@ -3425,7 +3425,7 @@ static int shmem_rename2(struct mnt_idma return simple_offset_rename_exchange(old_dir, old_dentry, new_dir, new_dentry); - if (!simple_offset_empty(new_dentry)) + if (!simple_empty(new_dentry)) return -ENOTEMPTY; if (flags & RENAME_WHITEOUT) {
