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nfs: fix congestion control: use atomic_longs

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Change the atomic_t in struct nfs_server to atomic_long_t in anticipation
of machines that can handle 8+TB of (4K) pages under writeback.

However I suspect other things in NFS will start going *bang* by then.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Zijlstra 2007-05-08 00:35:12 -07:00 committed by Linus Torvalds
parent 79df3c19aa
commit 277866a0e3
2 changed files with 3 additions and 3 deletions
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4
fs/nfs/write.c
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@ -224,7 +224,7 @@ static int nfs_set_page_writeback(struct page *page)
struct inode *inode = page->mapping->host;
struct nfs_server *nfss = NFS_SERVER(inode);
if (atomic_inc_return(&nfss->writeback) >
if (atomic_long_inc_return(&nfss->writeback) >
NFS_CONGESTION_ON_THRESH)
set_bdi_congested(&nfss->backing_dev_info, WRITE);
}
@ -237,7 +237,7 @@ static void nfs_end_page_writeback(struct page *page)
struct nfs_server *nfss = NFS_SERVER(inode);
end_page_writeback(page);
if (atomic_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) {
if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) {
clear_bdi_congested(&nfss->backing_dev_info, WRITE);
congestion_end(WRITE);
}

2
include/linux/nfs_fs_sb.h
View file

@ -82,7 +82,7 @@ struct nfs_server {
struct rpc_clnt * client_acl; /* ACL RPC client handle */
struct nfs_iostats * io_stats; /* I/O statistics */
struct backing_dev_info backing_dev_info;
atomic_t writeback; /* number of writeback pages */
atomic_long_t writeback; /* number of writeback pages */
int flags; /* various flags */
unsigned int caps; /* server capabilities */
unsigned int rsize; /* read size */