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Bug #546
closeddirect i/o does not work when offset is not page-aligned
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ceph-qa-suite:
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Description
When opening file with O_DIRECT, seeking to offset 6656 and reading 512 bytes gets wrong data.
Below is a strace log reading file on local fs:
open("/tmp/benian.img", O_RDONLY|O_DIRECT) = 3
stat("/tmp/benian.img", {st_mode=S_IFREG|0644, st_size=7168, ...}) = 0
lseek(3, 0, SEEK_END) = 7168
lseek(3, 0, SEEK_CUR) = 7168
lseek(3, 6656, SEEK_SET) = 6656
read(3, "conectix\0\0\0\2\0\1\0\0\0\0\0\0\0\0\2\0\24c\355\337tap\0"..., 512) = 512
Below is the strace log reading file on ceph:
open("/mnt/depot0/benian.img", O_RDONLY|O_DIRECT) = 3
stat("/mnt/depot0/benian.img", {st_mode=S_IFREG|0644, st_size=7168, ...}) = 0
lseek(3, 0, SEEK_END) = 7168
lseek(3, 0, SEEK_CUR) = 7168
lseek(3, 6656, SEEK_SET) = 6656
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512
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