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| author | Curt Wohlgemuth <curtw@google.com> | 2009-07-13 09:07:20 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-07-13 09:07:20 -0400 |
| commit | e6b5d30104db5f34110678ecab14988f1f1eff63 (patch) | |
| tree | 922408d70d388925f0113998649d56da475deff4 /fs/ext4/ext4_jbd2.c | |
| parent | 62e086be5d2abef8cad854bc5707329ad345f2ec (diff) | |
| download | lwn-e6b5d30104db5f34110678ecab14988f1f1eff63.tar.gz lwn-e6b5d30104db5f34110678ecab14988f1f1eff63.zip | |
ext4: Fix buffer head reference leak in no-journal mode
We found a problem with buffer head reference leaks when using an ext4
partition without a journal. In particular, calls to ext4_forget() would
not to a brelse() on the input buffer head, which will cause pages they
belong to to not be reclaimable.
Further investigation showed that all places where ext4_journal_forget() and
ext4_journal_revoke() are called are subject to the same problem. The patch
below changes __ext4_journal_forget/__ext4_journal_revoke to do an explicit
release of the buffer head when the journal handle isn't valid.
Signed-off-by: Curt Wohlgemuth <curtw@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4_jbd2.c')
| -rw-r--r-- | fs/ext4/ext4_jbd2.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c index ad13a84644e1..eb27fd0f2ee8 100644 --- a/fs/ext4/ext4_jbd2.c +++ b/fs/ext4/ext4_jbd2.c @@ -43,6 +43,8 @@ int __ext4_journal_forget(const char *where, handle_t *handle, ext4_journal_abort_handle(where, __func__, bh, handle, err); } + else + brelse(bh); return err; } @@ -57,6 +59,8 @@ int __ext4_journal_revoke(const char *where, handle_t *handle, ext4_journal_abort_handle(where, __func__, bh, handle, err); } + else + brelse(bh); return err; } |