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authorTao Ma <boyu.mt@taobao.com>2011-08-13 12:30:59 -0400
committerTheodore Ts'o <tytso@mit.edu>2011-08-13 12:30:59 -0400
commit32c80b32c053dc52712dedac5e4d0aa7c93fc353 (patch)
tree857375faae2d6c562741d14ed13a1411b197baf5 /Documentation/00-INDEX
parent2581fdc810889fdea97689cb62481201d579c796 (diff)
ext4: Resolve the hang of direct i/o read in handling EXT4_IO_END_UNWRITTEN.
EXT4_IO_END_UNWRITTEN flag set and the increase of i_aiodio_unwritten should be done simultaneously since ext4_end_io_nolock always clear the flag and decrease the counter in the same time. We don't increase i_aiodio_unwritten when setting EXT4_IO_END_UNWRITTEN so it will go nagative and causes some process to wait forever. Part of the patch came from Eric in his e-mail, but it doesn't fix the problem met by Michael actually. http://marc.info/?l=linux-ext4&m=131316851417460&w=2 Reported-and-Tested-by: Michael Tokarev<mjt@tls.msk.ru> Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@kernel.org
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