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authorChristoph Hellwig <hch@infradead.org>2013-11-14 08:50:34 -0800
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-01-13 17:29:50 -0500
commita9ab5e840669b19aca2974e2c771a77df2876434 (patch)
tree15616935d9d15765dfa121c347196f8de1f25ea3 /fs/nfs
parentd0b9875d65c1abcc9d405d648660dfb919353959 (diff)
downloadop-kernel-dev-a9ab5e840669b19aca2974e2c771a77df2876434.zip
op-kernel-dev-a9ab5e840669b19aca2974e2c771a77df2876434.tar.gz
nfs: page cache invalidation for dio
Make sure to properly invalidate the pagecache before performing direct I/O, so that no stale pages are left around. This matches what the generic direct I/O code does. Also take the i_mutex over the direct write submission to avoid the lifelock vs truncate waiting for i_dio_count to decrease, and to avoid having the pagecache easily repopulated while direct I/O is in progrss. Again matching the generic direct I/O code. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/direct.c29
1 files changed, 27 insertions, 2 deletions
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 85e4e4b..b8797ae 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -939,9 +939,12 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
struct inode *inode = mapping->host;
struct nfs_direct_req *dreq;
struct nfs_lock_context *l_ctx;
+ loff_t end;
size_t count;
count = iov_length(iov, nr_segs);
+ end = (pos + count - 1) >> PAGE_CACHE_SHIFT;
+
nfs_add_stats(mapping->host, NFSIOS_DIRECTWRITTENBYTES, count);
dfprintk(FILE, "NFS: direct write(%pD2, %zd@%Ld)\n",
@@ -958,16 +961,25 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
if (!count)
goto out;
+ mutex_lock(&inode->i_mutex);
+
result = nfs_sync_mapping(mapping);
if (result)
- goto out;
+ goto out_unlock;
+
+ if (mapping->nrpages) {
+ result = invalidate_inode_pages2_range(mapping,
+ pos >> PAGE_CACHE_SHIFT, end);
+ if (result)
+ goto out_unlock;
+ }
task_io_account_write(count);
result = -ENOMEM;
dreq = nfs_direct_req_alloc();
if (!dreq)
- goto out;
+ goto out_unlock;
dreq->inode = inode;
dreq->bytes_left = count;
@@ -982,6 +994,14 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
dreq->iocb = iocb;
result = nfs_direct_write_schedule_iovec(dreq, iov, nr_segs, pos, uio);
+
+ if (mapping->nrpages) {
+ invalidate_inode_pages2_range(mapping,
+ pos >> PAGE_CACHE_SHIFT, end);
+ }
+
+ mutex_unlock(&inode->i_mutex);
+
if (!result) {
result = nfs_direct_wait(dreq);
if (result > 0) {
@@ -994,8 +1014,13 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
spin_unlock(&inode->i_lock);
}
}
+ nfs_direct_req_release(dreq);
+ return result;
+
out_release:
nfs_direct_req_release(dreq);
+out_unlock:
+ mutex_unlock(&inode->i_mutex);
out:
return result;
}
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