This patch fixes the read_bytes count for NFS buffered reads.
Simple reproducer follows.
Before this patch:
# mount 127.0.0.1:/ /mnt/nfs
# bash
# function dump_stats { cat /proc/$$/io; }
# trap dump_stats EXIT
# cat /mnt/nfs/file1.bin > /dev/null
# exit
exit
rchar: 3587436
wchar: 1054077
syscr: 544
syscw: 33
read_bytes: 0
write_bytes: 0
cancelled_write_bytes: 0
After this patch:
# mount 127.0.0.1:/ /mnt/nfs
# bash
# function dump_stats { cat /proc/$$/io; }
# trap dump_stats EXIT
# cat /mnt/nfs/file1.bin > /dev/null
# exit
exit
rchar: 3587278
wchar: 1054161
syscr: 544
syscw: 33
read_bytes: 1048576
write_bytes: 0
cancelled_write_bytes: 0
Dave Wysochanski (1):
NFS: Fix /proc/PID/io read_bytes for buffered reads
fs/nfs/read.c | 3 +++
1 file changed, 3 insertions(+)
--
2.31.1
