6.6-stable review patch. If anyone has any objections, please let me know.
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From: Luis Henriques (SUSE) luis.henriques@linux.dev
commit faab35a0370fd6e0821c7a8dd213492946fc776f upstream.
Calling ext4_fc_mark_ineligible() with a NULL handle is racy and may result in a fast-commit being done before the filesystem is effectively marked as ineligible. This patch fixes the calls to this function in __track_dentry_update() by adding an extra parameter to the callback used in ext4_fc_track_template().
Suggested-by: Jan Kara jack@suse.cz Signed-off-by: Luis Henriques (SUSE) luis.henriques@linux.dev Reviewed-by: Jan Kara jack@suse.cz Link: https://patch.msgid.link/20240923104909.18342-2-luis.henriques@linux.dev Signed-off-by: Theodore Ts'o tytso@mit.edu Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ext4/fast_commit.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-)
--- a/fs/ext4/fast_commit.c +++ b/fs/ext4/fast_commit.c @@ -379,7 +379,7 @@ void ext4_fc_mark_ineligible(struct supe */ static int ext4_fc_track_template( handle_t *handle, struct inode *inode, - int (*__fc_track_fn)(struct inode *, void *, bool), + int (*__fc_track_fn)(handle_t *handle, struct inode *, void *, bool), void *args, int enqueue) { bool update = false; @@ -396,7 +396,7 @@ static int ext4_fc_track_template( ext4_fc_reset_inode(inode); ei->i_sync_tid = tid; } - ret = __fc_track_fn(inode, args, update); + ret = __fc_track_fn(handle, inode, args, update); mutex_unlock(&ei->i_fc_lock);
if (!enqueue) @@ -420,7 +420,8 @@ struct __track_dentry_update_args { };
/* __track_fn for directory entry updates. Called with ei->i_fc_lock. */ -static int __track_dentry_update(struct inode *inode, void *arg, bool update) +static int __track_dentry_update(handle_t *handle, struct inode *inode, + void *arg, bool update) { struct ext4_fc_dentry_update *node; struct ext4_inode_info *ei = EXT4_I(inode); @@ -435,14 +436,14 @@ static int __track_dentry_update(struct
if (IS_ENCRYPTED(dir)) { ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_ENCRYPTED_FILENAME, - NULL); + handle); mutex_lock(&ei->i_fc_lock); return -EOPNOTSUPP; }
node = kmem_cache_alloc(ext4_fc_dentry_cachep, GFP_NOFS); if (!node) { - ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_NOMEM, NULL); + ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_NOMEM, handle); mutex_lock(&ei->i_fc_lock); return -ENOMEM; } @@ -454,7 +455,7 @@ static int __track_dentry_update(struct node->fcd_name.name = kmalloc(dentry->d_name.len, GFP_NOFS); if (!node->fcd_name.name) { kmem_cache_free(ext4_fc_dentry_cachep, node); - ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_NOMEM, NULL); + ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_NOMEM, handle); mutex_lock(&ei->i_fc_lock); return -ENOMEM; } @@ -576,7 +577,8 @@ void ext4_fc_track_create(handle_t *hand }
/* __track_fn for inode tracking */ -static int __track_inode(struct inode *inode, void *arg, bool update) +static int __track_inode(handle_t *handle, struct inode *inode, void *arg, + bool update) { if (update) return -EEXIST; @@ -614,7 +616,8 @@ struct __track_range_args { };
/* __track_fn for tracking data updates */ -static int __track_range(struct inode *inode, void *arg, bool update) +static int __track_range(handle_t *handle, struct inode *inode, void *arg, + bool update) { struct ext4_inode_info *ei = EXT4_I(inode); ext4_lblk_t oldstart;