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btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()

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[ Upstream commit a85b46db14 ]

If overlay is used on top of btrfs, dentry->d_sb translates to overlay's
super block and fsid assignment will lead to a crash.

Use file_inode(file)->i_sb to always get btrfs_sb.

Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Goldwyn Rodrigues
2026-04-27 07:23:25 -06:00
committed by Greg Kroah-Hartman
parent aa77bd6d08
commit c09a7446aa
1 changed files with 7 additions and 4 deletions
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include/trace/events/btrfs.h
+7 -4
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@@ -789,12 +789,15 @@ TRACE_EVENT(btrfs_sync_file,
),
TP_fast_assign(
const struct dentry *dentry = file->f_path.dentry;
const struct inode *inode = d_inode(dentry);
struct dentry *dentry = file_dentry(file);
struct inode *inode = file_inode(file);
struct dentry *parent = dget_parent(dentry);
struct inode *parent_inode = d_inode(parent);
TP_fast_assign_fsid(btrfs_sb(file->f_path.dentry->d_sb));
dput(parent);
TP_fast_assign_fsid(btrfs_sb(inode->i_sb));
__entry->ino = btrfs_ino(BTRFS_I(inode));
__entry->parent = btrfs_ino(BTRFS_I(d_inode(dentry->d_parent)));
__entry->parent = btrfs_ino(BTRFS_I(parent_inode));
__entry->datasync = datasync;
__entry->root_objectid =
BTRFS_I(inode)->root->root_key.objectid;