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authorIlya Dryomov2022-02-01 11:04:20 +0100
committerJens Axboe2022-02-02 07:48:27 -0700
commit3e1f941dd9f33776b3df4e30f741fe445ff773f3 (patch)
tree63b4bee0083b697795d6c07f89158073eca526dd /drivers/cpufreq/elanfreq.c
parentb879f915bc48a18d4f4462729192435bb0f17052 (diff)
block: fix DIO handling regressions in blkdev_read_iter()
Commit ceaa762527f4 ("block: move direct_IO into our own read_iter handler") introduced several regressions for bdev DIO: 1. read spanning EOF always returns 0 instead of the number of bytes read. This is because "count" is assigned early and isn't updated when the iterator is truncated: $ lsblk -o name,size /dev/vdb NAME SIZE vdb 1G $ xfs_io -d -c 'pread -b 4M 1021M 4M' /dev/vdb read 0/4194304 bytes at offset 1070596096 0.000000 bytes, 0 ops; 0.0007 sec (0.000000 bytes/sec and 0.0000 ops/sec) instead of $ xfs_io -d -c 'pread -b 4M 1021M 4M' /dev/vdb read 3145728/4194304 bytes at offset 1070596096 3 MiB, 1 ops; 0.0007 sec (3.865 GiB/sec and 1319.2612 ops/sec) 2. truncated iterator isn't reexpanded 3. iterator isn't reverted on blkdev_direct_IO() error 4. zero size read no longer skips atime update Fixes: ceaa762527f4 ("block: move direct_IO into our own read_iter handler") Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220201100420.25875-1-idryomov@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/cpufreq/elanfreq.c')
0 files changed, 0 insertions, 0 deletions