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| author | Zhang Yi <yi.zhang@huawei.com> | 2022-09-01 21:34:57 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-09-11 20:26:06 -0700 |
| commit | 8c004d1fc1497d9a6d92ea968bd58230af59a492 (patch) | |
| tree | ab1008631e0cc3f03c11c606b89184ff5123f67e /fs/jbd2/journal.c | |
| parent | 0ed48061887f603b33b7dcb9075cbfaaa8d02723 (diff) | |
| download | linux-8c004d1fc1497d9a6d92ea968bd58230af59a492.tar.gz linux-8c004d1fc1497d9a6d92ea968bd58230af59a492.tar.bz2 linux-8c004d1fc1497d9a6d92ea968bd58230af59a492.zip | |
jbd2: replace ll_rw_block()
ll_rw_block() is not safe for the sync read path because it cannot
guarantee that submitting read IO if the buffer has been locked. We
could get false positive EIO after wait_on_buffer() if the buffer has
been locked by others. So stop using ll_rw_block() in
journal_get_superblock(). We also switch to new bh_readahead_batch()
for the buffer array readahead path.
Link: https://lkml.kernel.org/r/20220901133505.2510834-7-yi.zhang@huawei.com
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs/jbd2/journal.c')
| -rw-r--r-- | fs/jbd2/journal.c | 15 |
1 files changed, 6 insertions, 9 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index 6350d3857c89..140b070471c0 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -1893,19 +1893,16 @@ static int journal_get_superblock(journal_t *journal) { struct buffer_head *bh; journal_superblock_t *sb; - int err = -EIO; + int err; bh = journal->j_sb_buffer; J_ASSERT(bh != NULL); - if (!buffer_uptodate(bh)) { - ll_rw_block(REQ_OP_READ, 1, &bh); - wait_on_buffer(bh); - if (!buffer_uptodate(bh)) { - printk(KERN_ERR - "JBD2: IO error reading journal superblock\n"); - goto out; - } + err = bh_read(bh, 0); + if (err < 0) { + printk(KERN_ERR + "JBD2: IO error reading journal superblock\n"); + goto out; } if (buffer_verified(bh)) |