From: Trond Myklebust <trond.myklebust@primarydata.com>
To: linux-nfs@vger.kernel.org
Subject: [PATCH v4 12/17] NFS: Move buffered I/O locking into nfs_file_write()
Date: Thu, 23 Jun 2016 16:00:44 -0400 [thread overview]
Message-ID: <1466712049-5326-12-git-send-email-trond.myklebust@primarydata.com> (raw)
In-Reply-To: <1466712049-5326-11-git-send-email-trond.myklebust@primarydata.com>
Preparation for the patch that de-serialises O_DIRECT reads and
writes.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
---
fs/nfs/file.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index c26847c84d00..46cf0afe3c0f 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -623,7 +623,6 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
struct inode *inode = file_inode(file);
unsigned long written = 0;
ssize_t result;
- size_t count = iov_iter_count(from);
result = nfs_key_timeout_notify(file, inode);
if (result)
@@ -633,9 +632,8 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
return nfs_file_direct_write(iocb, from);
dprintk("NFS: write(%pD2, %zu@%Ld)\n",
- file, count, (long long) iocb->ki_pos);
+ file, iov_iter_count(from), (long long) iocb->ki_pos);
- result = -EBUSY;
if (IS_SWAPFILE(inode))
goto out_swapfile;
/*
@@ -647,28 +645,33 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
goto out;
}
- result = count;
- if (!count)
+ inode_lock(inode);
+ result = generic_write_checks(iocb, from);
+ if (result > 0) {
+ current->backing_dev_info = inode_to_bdi(inode);
+ result = generic_perform_write(file, from, iocb->ki_pos);
+ current->backing_dev_info = NULL;
+ }
+ inode_unlock(inode);
+ if (result <= 0)
goto out;
- result = generic_file_write_iter(iocb, from);
- if (result > 0)
- written = result;
+ written = generic_write_sync(iocb, result);
+ iocb->ki_pos += written;
/* Return error values */
- if (result >= 0 && nfs_need_check_write(file, inode)) {
+ if (nfs_need_check_write(file, inode)) {
int err = vfs_fsync(file, 0);
if (err < 0)
result = err;
}
- if (result > 0)
- nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
+ nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
out:
return result;
out_swapfile:
printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
- goto out;
+ return -EBUSY;
}
EXPORT_SYMBOL_GPL(nfs_file_write);
--
2.7.4
next prev parent reply other threads:[~2016-06-23 20:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-23 20:00 [PATCH v4 01/17] NFS: Don't flush caches for a getattr that races with writeback Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 02/17] NFS: Cache access checks more aggressively Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 03/17] NFS: Cache aggressively when file is open for writing Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 04/17] NFS: Kill NFS_INO_NFS_INO_FLUSHING: it is a performance killer Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 05/17] NFS: writepage of a single page should not be synchronous Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 06/17] NFS: Don't hold the inode lock across fsync() Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 07/17] NFS: Don't call COMMIT in ->releasepage() Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 08/17] NFS: Fix O_DIRECT verifier problems Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 09/17] NFS: Ensure we reset the write verifier 'committed' value on resend Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 10/17] NFS: Remove racy size manipulations in O_DIRECT Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 11/17] NFS Cleanup: move call to generic_write_checks() into fs/nfs/direct.c Trond Myklebust
2016-06-23 20:00 ` Trond Myklebust [this message]
2016-06-23 20:00 ` [PATCH v4 13/17] NFS: Do not serialise O_DIRECT reads and writes Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 14/17] NFS: Cleanup nfs_direct_complete() Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 15/17] NFS: Remove redundant waits for O_DIRECT in fsync() and write_begin() Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 16/17] NFS: Remove unused function nfs_revalidate_mapping_protected() Trond Myklebust
2016-06-23 20:00 ` [PATCH v4 17/17] NFS nfs_vm_page_mkwrite: Don't freeze me, Bro Trond Myklebust
2016-06-28 12:12 ` [PATCH v4 01/17] NFS: Don't flush caches for a getattr that races with writeback Christoph Hellwig
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