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authorTheodore Ts'o <tytso@mit.edu>2010-12-14 15:27:50 -0500
committerTheodore Ts'o <tytso@mit.edu>2010-12-14 15:27:50 -0500
commit1449032be17abb69116dbc393f67ceb8bd034f92 (patch)
treef62757457241c2fdc14105afc12cb2718f7a2e68 /fs/minix/minix.h
parente8a7e48bb248a1196484d3f8afa53bded2b24e71 (diff)
ext4: Turn off multiple page-io submission by default
Jon Nelson has found a test case which causes postgresql to fail with the error: psql:t.sql:4: ERROR: invalid page header in block 38269 of relation base/16384/16581 Under memory pressure, it looks like part of a file can end up getting replaced by zero's. Until we can figure out the cause, we'll roll back the change and use block_write_full_page() instead of ext4_bio_write_page(). The new, more efficient writing function can be used via the mount option mblk_io_submit, so we can test and fix the new page I/O code. To reproduce the problem, install postgres 8.4 or 9.0, and pin enough memory such that the system just at the end of triggering writeback before running the following sql script: begin; create temporary table foo as select x as a, ARRAY[x] as b FROM generate_series(1, 10000000 ) AS x; create index foo_a_idx on foo (a); create index foo_b_idx on foo USING GIN (b); rollback; If the temporary table is created on a hard drive partition which is encrypted using dm_crypt, then under memory pressure, approximately 30-40% of the time, pgsql will issue the above failure. This patch should fix this problem, and the problem will come back if the file system is mounted with the mblk_io_submit mount option. Reported-by: Jon Nelson <jnelson@jamponi.net> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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