From: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Currently, the nfs server holds the inode->i_mutex across both the
filemap_write_and_wait() call and the fsync() call itself. However we know
that filemap_write_and_wait() is already safe against livelocks, so we only
need to hold the mutex across the fsync() call.
Fix this by reusing vfs_fsync(), which already does the right thing.
Also make sure that we use vfs_fsync_range() in the COMMIT operation, to
improve the efficiency for clients that do specify a range.
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
---
fs/nfsd/vfs.c | 58 +++++++++++++++++++++------------------------------------
1 files changed, 21 insertions(+), 37 deletions(-)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index c194793..e4568d6 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -769,40 +769,17 @@ nfsd_close(struct file *filp)
}
/*
- * Sync a file
- * As this calls fsync (not fdatasync) there is no need for a write_inode
- * after it.
+ * Sync a directory
+ * returns 0 if the directory had no fsync method
*/
-static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
- const struct file_operations *fop)
-{
- struct inode *inode = dp->d_inode;
- int (*fsync) (struct file *, struct dentry *, int);
- int err;
-
- err = filemap_write_and_wait(inode->i_mapping);
- if (err == 0 && fop && (fsync = fop->fsync))
- err = fsync(filp, dp, 0);
- return err;
-}
-
-static int
-nfsd_sync(struct file *filp)
-{
- int err;
- struct inode *inode = filp->f_path.dentry->d_inode;
- dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name);
- mutex_lock(&inode->i_mutex);
- err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op);
- mutex_unlock(&inode->i_mutex);
-
- return err;
-}
-
int
nfsd_sync_dir(struct dentry *dp)
{
- return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
+ int err;
+
+ dprintk("nfsd: sync directory %s\n", dp->d_name.name);
+ err = vfs_fsync(NULL, dp, 0);
+ return (err != -EINVAL) ? err : 0;
}
/*
@@ -1008,7 +985,9 @@ static int wait_for_concurrent_writes(struct file *file)
if (inode->i_state & I_DIRTY) {
dprintk("nfsd: write sync %d\n", task_pid_nr(current));
- err = nfsd_sync(file);
+ err = vfs_fsync(file, file->f_path.dentry, 0);
+ if (err == -EINVAL)
+ err = 0;
}
last_ino = inode->i_ino;
last_dev = inode->i_sb->s_dev;
@@ -1156,8 +1135,6 @@ out:
#ifdef CONFIG_NFSD_V3
/*
* Commit all pending writes to stable storage.
- * Strictly speaking, we could sync just the indicated file region here,
- * but there's currently no way we can ask the VFS to do so.
*
* Unfortunately we cannot lock the file to make sure we return full WCC
* data to the client, as locking happens lower down in the filesystem.
@@ -1176,11 +1153,18 @@ nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
if (err)
return err;
if (EX_ISSYNC(fhp->fh_export)) {
- if (file->f_op && file->f_op->fsync) {
- err = nfserrno(nfsd_sync(file));
- } else {
+ loff_t end = LLONG_MAX;
+ int err2;
+
+ if (count != 0)
+ end = offset + count;
+ err2 = vfs_fsync_range(file, file->f_path.dentry,
+ offset, end, 0);
+
+ if (err2 != -EINVAL)
+ err = nfserrno(err2);
+ else
err = nfserr_notsupp;
- }
}
nfsd_close(file);
--
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