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authorChristoph Hellwig <hch@infradead.org>2013-11-14 08:50:30 -0800
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-01-13 17:29:49 -0500
commit1f90ee27461e31a1c18e5d819f6ea6f5c7304b16 (patch)
tree96a85b91576188ed1921c672d96adabe3a025bfa /fs/nfs/direct.c
parent2a009ec98cce440c0992fc9a2353e96cdb0b048b (diff)
downloadlinux-1f90ee27461e31a1c18e5d819f6ea6f5c7304b16.tar.bz2
nfs: increment i_dio_count for reads, too
i_dio_count is used to protect dio access against truncate. We want to make sure there are no dio reads pending either when doing a truncate. I suspect on plain NFS things might work even without this, but once we use a pnfs layout driver that access backing devices directly things will go bad without the proper synchronization. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/direct.c')
-rw-r--r--fs/nfs/direct.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 75ed2a90b0f2..6c232107e835 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -235,10 +235,10 @@ static void nfs_direct_complete(struct nfs_direct_req *dreq, bool write)
spin_unlock(&inode->i_lock);
}
- if (write) {
+ if (write)
nfs_zap_mapping(inode, inode->i_mapping);
- inode_dio_done(inode);
- }
+
+ inode_dio_done(inode);
if (dreq->iocb) {
long res = (long) dreq->error;
@@ -419,6 +419,7 @@ static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
loff_t pos, bool uio)
{
struct nfs_pageio_descriptor desc;
+ struct inode *inode = dreq->inode;
ssize_t result = -EINVAL;
size_t requested_bytes = 0;
unsigned long seg;
@@ -427,6 +428,7 @@ static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
&nfs_direct_read_completion_ops);
get_dreq(dreq);
desc.pg_dreq = dreq;
+ atomic_inc(&inode->i_dio_count);
for (seg = 0; seg < nr_segs; seg++) {
const struct iovec *vec = &iov[seg];
@@ -446,6 +448,7 @@ static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
* generic layer handle the completion.
*/
if (requested_bytes == 0) {
+ inode_dio_done(inode);
nfs_direct_req_release(dreq);
return result < 0 ? result : -EIO;
}