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NFS: Fix byte accounting for generic NFS reads 

Currently, the NFS I/O counters count the number of bytes requested
by applications, rather than the number of bytes actually read by the
system calls.

The number of bytes requested for reads is actually not that useful,
because the value is usually a buffer size for reads.  That is, that
requested number is usually a maximum, and frequently doesn't reflect
the actual number of bytes read.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2010-02-01 14:17:23 -05:00 committed by Trond Myklebust
parent c2459dc462
commit 4184dcf2db
1 changed files with 4 additions and 2 deletions
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6
fs/nfs/file.c
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@ -262,9 +262,11 @@ nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
(unsigned long) count, (unsigned long) pos); (unsigned long) count, (unsigned long) pos);
result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); if (!result) {
if (!result)
result = generic_file_aio_read(iocb, iov, nr_segs, pos); result = generic_file_aio_read(iocb, iov, nr_segs, pos);
if (result > 0)
nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
}
return result; return result;
} }