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| author | Theodore Ts'o <tytso@mit.edu> | 2009-01-06 05:34:13 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-01-06 05:34:13 +0300 |
| commit | fd98496f467b3d26d05ab1498f41718b5ef13de5 (patch) | |
| tree | 27e29934f5c2ee5ccc060de27dee261d31d6842c /fs/jbd2 | |
| parent | 0390131ba84fd3f726f9e24fc4553828125700bb (diff) | |
| download | linux-fd98496f467b3d26d05ab1498f41718b5ef13de5.tar.xz | |
jbd2: Add barrier not supported test to journal_wait_on_commit_record
Xen doesn't report that barriers are not supported until buffer I/O is
reported as completed, instead of when the buffer I/O is submitted.
Add a check and a fallback codepath to journal_wait_on_commit_record()
to detect this case, so that attempts to mount ext4 filesystems on
LVM/devicemapper devices on Xen guests don't blow up with an "Aborting
journal on device XXX"; "Remounting filesystem read-only" error.
Thanks to Andreas Sundstrom for reporting this issue.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
Diffstat (limited to 'fs/jbd2')
| -rw-r--r-- | fs/jbd2/commit.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c index ebc667bc54a8..6393fd0d804e 100644 --- a/fs/jbd2/commit.c +++ b/fs/jbd2/commit.c @@ -25,6 +25,7 @@ #include <linux/crc32.h> #include <linux/writeback.h> #include <linux/backing-dev.h> +#include <linux/bio.h> /* * Default IO end handler for temporary BJ_IO buffer_heads. @@ -168,12 +169,34 @@ static int journal_submit_commit_record(journal_t *journal, * This function along with journal_submit_commit_record * allows to write the commit record asynchronously. */ -static int journal_wait_on_commit_record(struct buffer_head *bh) +static int journal_wait_on_commit_record(journal_t *journal, + struct buffer_head *bh) { int ret = 0; +retry: clear_buffer_dirty(bh); wait_on_buffer(bh); + if (buffer_eopnotsupp(bh) && (journal->j_flags & JBD2_BARRIER)) { + printk(KERN_WARNING + "JBD2: wait_on_commit_record: sync failed on %s - " + "disabling barriers\n", journal->j_devname); + spin_lock(&journal->j_state_lock); + journal->j_flags &= ~JBD2_BARRIER; + spin_unlock(&journal->j_state_lock); + + lock_buffer(bh); + clear_buffer_dirty(bh); + set_buffer_uptodate(bh); + bh->b_end_io = journal_end_buffer_io_sync; + + ret = submit_bh(WRITE_SYNC, bh); + if (ret) { + unlock_buffer(bh); + return ret; + } + goto retry; + } if (unlikely(!buffer_uptodate(bh))) ret = -EIO; @@ -799,7 +822,7 @@ wait_for_iobuf: __jbd2_journal_abort_hard(journal); } if (!err && !is_journal_aborted(journal)) - err = journal_wait_on_commit_record(cbh); + err = journal_wait_on_commit_record(journal, cbh); if (err) jbd2_journal_abort(journal, err); |