diff options
| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-05-26 08:42:24 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-07-05 11:22:56 -0700 |
| commit | 135b48da0c911dbd8aa4c52742b9022643bc02a3 (patch) | |
| tree | cf499293211f91c98327685f99fc2c56d195c4fd | |
| parent | 53dc58fdce4053334b2f47e692d4769f92f41255 (diff) | |
NFS: Fix another nfs_wb_page() deadlock
commit 0522f6adedd2736cbca3c0e16ca51df668993eee upstream.
J.R. Okajima reports that the call to sync_inode() in nfs_wb_page() can
deadlock with other writeback flush calls. It boils down to the fact
that we cannot ever call writeback_single_inode() while holding a page
lock (even if we do set nr_to_write to zero) since another process may
already be waiting in the call to do_writepages(), and so will deny us
the I_SYNC lock.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/nfs/write.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/nfs/write.c b/fs/nfs/write.c index b8a6d7af2a1..91679e2631e 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1518,14 +1518,17 @@ int nfs_wb_page(struct inode *inode, struct page *page) }; int ret; - while(PagePrivate(page)) { + for (;;) { wait_on_page_writeback(page); if (clear_page_dirty_for_io(page)) { ret = nfs_writepage_locked(page, &wbc); if (ret < 0) goto out_error; + continue; } - ret = sync_inode(inode, &wbc); + if (!PagePrivate(page)) + break; + ret = nfs_commit_inode(inode, FLUSH_SYNC); if (ret < 0) goto out_error; } |