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NFS: Don't do a full flush to disk on close() if we hold a delegation

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If we hold a delegation then we know that it should be safe to continue
to cache the data beyond the close(). However since the process that wrote
the data may die after close(), we may still want to send the data to
server before those RPCSEC_GSS credentials expire. We therefore compromise
by starting writeback to the server, but don't wait for completion.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-05-06 19:10:59 -04:00
parent 1385b81173
commit 14546c3375
1 changed files with 7 additions and 0 deletions
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7
fs/nfs/file.c
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@ -174,6 +174,13 @@ nfs_file_flush(struct file *file, fl_owner_t id)
if ((file->f_mode & FMODE_WRITE) == 0)
return 0;
/*
* If we're holding a write delegation, then just start the i/o
* but don't wait for completion (or send a commit).
*/
if (nfs_have_delegation(inode, FMODE_WRITE))
return filemap_fdatawrite(file->f_mapping);
/* Flush writes to the server and return any errors */
return vfs_fsync(file, 0);
}