kernel.git/fs/overlayfs/super.c, branch master

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51Z

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28Z

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

ovl: relax requirement for uuid=off,index=on

2026-02-06T12:48:23Z

uuid=off,index=on required that all upper/lower directories are on the same filesystem. Relax the requirement so that only all the lower directories need to be on the same filesystem. Reported-by: André Almeida Link: https://lore.kernel.org/r/20260114-tonyk-get_disk_uuid-v1-3-e6a319e25d57@igalia.com/ Signed-off-by: Amir Goldstein

Merge tag 'fuse-update-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

2025-12-05T23:25:13Z

Pull fuse updates from Miklos Szeredi: - Add mechanism for cleaning out unused, stale dentries; controlled via a module option (Luis Henriques) - Fix various bugs - Cleanups * tag 'fuse-update-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: fuse: Uninitialized variable in fuse_epoch_work() fuse: fix io-uring list corruption for terminated non-committed requests fuse: signal that a fuse inode should exhibit local fs behaviors fuse: Always flush the page cache before FOPEN_DIRECT_IO write fuse: Invalidate the page cache after FOPEN_DIRECT_IO write fuse: rename 'namelen' to 'namesize' fuse: use strscpy instead of strcpy fuse: refactor fuse_conn_put() to remove negative logic. fuse: new work queue to invalidate dentries from old epochs fuse: new work queue to periodically invalidate expired dentries dcache: export shrink_dentry_list() and add new helper d_dispose_if_unused() fuse: add WARN_ON and comment for RCU revalidate fuse: Fix whitespace for fuse_uring_args_to_ring() comment fuse: missing copy_finish in fuse-over-io-uring argument copies fuse: fix readahead reclaim deadlock

ovl: port ovl_fill_super() to cred guard

2025-11-19T20:58:25Z

Use the scoped ovl cred guard. Link: https://patch.msgid.link/20251117-work-ovl-cred-guard-v4-41-b31603935724@kernel.org Reviewed-by: Amir Goldstein Signed-off-by: Christian Brauner

ovl: refactor ovl_fill_super()

2025-11-19T20:58:25Z

Split the core into a separate helper in preparation of converting the caller to the scoped ovl cred guard. Link: https://patch.msgid.link/20251117-work-ovl-cred-guard-v4-40-b31603935724@kernel.org Reviewed-by: Amir Goldstein Signed-off-by: Christian Brauner

VFS: introduce end_creating_keep()

2025-11-14T12:15:58Z

Occasionally the caller of end_creating() wants to keep using the dentry. Rather then requiring them to dget() the dentry (when not an error) before calling end_creating(), provide end_creating_keep() which does this. cachefiles and overlayfs make use of this. Reviewed-by: Amir Goldstein Reviewed-by: Jeff Layton Signed-off-by: NeilBrown Link: https://patch.msgid.link/20251113002050.676694-16-neilb@ownmail.net Tested-by: syzbot@syzkaller.appspotmail.com Signed-off-by: Christian Brauner

VFS: change vfs_mkdir() to unlock on failure.

2025-11-14T12:15:58Z

vfs_mkdir() already drops the reference to the dentry on failure but it leaves the parent locked. This complicates end_creating() which needs to unlock the parent even though the dentry is no longer available. If we change vfs_mkdir() to unlock on failure as well as releasing the dentry, we can remove the "parent" arg from end_creating() and simplify the rules for calling it. Note that cachefiles_get_directory() can choose to substitute an error instead of actually calling vfs_mkdir(), for fault injection. In that case it needs to call end_creating(), just as vfs_mkdir() now does on error. ovl_create_real() will now unlock on error. So the conditional end_creating() after the call is removed, and end_creating() is called internally on error. Reviewed-by: Amir Goldstein Reviewed-by: Jeff Layton Tested-by: syzbot@syzkaller.appspotmail.com Signed-off-by: NeilBrown Link: https://patch.msgid.link/20251113002050.676694-15-neilb@ownmail.net Signed-off-by: Christian Brauner

VFS/ovl/smb: introduce start_renaming_dentry()

2025-11-14T12:15:57Z

Several callers perform a rename on a dentry they already have, and only require lookup for the target name. This includes smb/server and a few different places in overlayfs. start_renaming_dentry() performs the required lookup and takes the required lock using lock_rename_child() It is used in three places in overlayfs and in ksmbd_vfs_rename(). In the ksmbd case, the parent of the source is not important - the source must be renamed from wherever it is. So start_renaming_dentry() allows rd->old_parent to be NULL and only checks it if it is non-NULL. On success rd->old_parent will be the parent of old_dentry with an extra reference taken. Other start_renaming function also now take the extra reference and end_renaming() now drops this reference as well. ovl_lookup_temp(), ovl_parent_lock(), and ovl_parent_unlock() are all removed as they are no longer needed. OVL_TEMPNAME_SIZE and ovl_tempname() are now declared in overlayfs.h so that ovl_check_rename_whiteout() can access them. ovl_copy_up_workdir() now always cleans up on error. Reviewed-by: Namjae Jeon Reviewed-by: Amir Goldstein Reviewed-by: Jeff Layton Signed-off-by: NeilBrown Link: https://patch.msgid.link/20251113002050.676694-12-neilb@ownmail.net Tested-by: syzbot@syzkaller.appspotmail.com Signed-off-by: Christian Brauner

VFS/nfsd/cachefiles/ovl: add start_creating() and end_creating()

2025-11-14T12:15:56Z

start_creating() is similar to simple_start_creating() but is not so simple. It takes a qstr for the name, includes permission checking, and does NOT report an error if the name already exists, returning a positive dentry instead. This is currently used by nfsd, cachefiles, and overlayfs. end_creating() is called after the dentry has been used. end_creating() drops the reference to the dentry as it is generally no longer needed. This is exactly the first section of end_creating_path() so that function is changed to call the new end_creating() These calls help encapsulate locking rules so that directory locking can be changed. Occasionally this change means that the parent lock is held for a shorter period of time, for example in cachefiles_commit_tmpfile(). As this function now unlocks after an unlink and before the following lookup, it is possible that the lookup could again find a positive dentry, so a while loop is introduced there. In overlayfs the ovl_lookup_temp() function has ovl_tempname() split out to be used in ovl_start_creating_temp(). The other use of ovl_lookup_temp() is preparing for a rename. When rename handling is updated, ovl_lookup_temp() will be removed. Reviewed-by: Jeff Layton Reviewed-by: Amir Goldstein Signed-off-by: NeilBrown Link: https://patch.msgid.link/20251113002050.676694-5-neilb@ownmail.net Tested-by: syzbot@syzkaller.appspotmail.com Signed-off-by: Christian Brauner