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authorTheodore Ts'o <tytso@mit.edu>2023-03-08 07:15:49 +0300
committerTheodore Ts'o <tytso@mit.edu>2023-03-11 08:44:24 +0300
commit62913ae96de747091c4dacd06d158e7729c1a76d (patch)
treeb8216b43eed65fb2f7ddbedb9bdb7697a890b861 /include
parent2b96b4a5d9443ca4cad58b0040be455803c05a42 (diff)
downloadlinux-62913ae96de747091c4dacd06d158e7729c1a76d.tar.xz
ext4, jbd2: add an optimized bmap for the journal inode
The generic bmap() function exported by the VFS takes locks and does checks that are not necessary for the journal inode. So allow the file system to set a journal-optimized bmap function in journal->j_bmap. Reported-by: syzbot+9543479984ae9e576000@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?id=e4aaa78795e490421c79f76ec3679006c8ff4cf0 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'include')
-rw-r--r--include/linux/jbd2.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 2170e0cc279d..6ffa34c51a11 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -1308,6 +1308,14 @@ struct journal_s
struct buffer_head *bh,
enum passtype pass, int off,
tid_t expected_commit_id);
+
+ /**
+ * @j_bmap:
+ *
+ * Bmap function that should be used instead of the generic
+ * VFS bmap function.
+ */
+ int (*j_bmap)(struct journal_s *journal, sector_t *block);
};
#define jbd2_might_wait_for_commit(j) \