On Tue, 2010-01-26 at 06:21 -0500, Christoph Hellwig wrote:
> On Mon, Jan 25, 2010 at 05:15:45PM -0500, Trond Myklebust wrote:
> > int nfs_wb_nocommit(struct inode *inode)
> > {
> > - return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT);
> > + return filemap_write_and_wait(inode->i_mapping);
>
> Any point in keeping this as a wrapper for a single well-documented
> caller? Also taking i_mutex around it seems a bit questionable these
> days given that filemap_write_and_wait avoids lifelocks with writing
> applications okay and we use it without i_mutex all over the place.
>
I'm replacing the former patch with the following updated version.
Cheers
Trond
---------------------------------------------------------------------------------------------
NFS: Replace __nfs_write_mapping with sync_inode()
From: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Now that we have correct COMMIT semantics in writeback_single_inode, we can
reduce and simplify nfs_wb_all(). Also replace nfs_wb_nocommit() with a
call to filemap_write_and_wait(), which doesn't need to hold the
inode->i_mutex.
With that done, we can eliminate nfs_write_mapping() altogether.
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
---
fs/nfs/inode.c | 15 +++++----------
fs/nfs/write.c | 42 +++++-------------------------------------
include/linux/nfs_fs.h | 2 --
3 files changed, 10 insertions(+), 49 deletions(-)
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 8341709..733cb27 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -495,17 +495,11 @@ int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
int err;
- /*
- * Flush out writes to the server in order to update c/mtime.
- *
- * Hold the i_mutex to suspend application writes temporarily;
- * this prevents long-running writing applications from blocking
- * nfs_wb_nocommit.
- */
+ /* Flush out writes to the server in order to update c/mtime. */
if (S_ISREG(inode->i_mode)) {
- mutex_lock(&inode->i_mutex);
- nfs_wb_nocommit(inode);
- mutex_unlock(&inode->i_mutex);
+ err = filemap_write_and_wait(inode->i_mapping);
+ if (err)
+ goto out;
}
/*
@@ -529,6 +523,7 @@ int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
generic_fillattr(inode, stat);
stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
}
+out:
return err;
}
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 53df027..c28cf57 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1443,7 +1443,6 @@ long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_contr
pgoff_t idx_start, idx_end;
unsigned int npages = 0;
LIST_HEAD(head);
- int nocommit = how & FLUSH_NOCOMMIT;
long pages, ret;
/* FIXME */
@@ -1460,14 +1459,11 @@ long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_contr
npages = 0;
}
}
- how &= ~FLUSH_NOCOMMIT;
spin_lock(&inode->i_lock);
do {
ret = nfs_wait_on_requests_locked(inode, idx_start, npages);
if (ret != 0)
continue;
- if (nocommit)
- break;
pages = nfs_scan_commit(inode, &head, idx_start, npages);
if (pages == 0)
break;
@@ -1481,47 +1477,19 @@ long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_contr
return ret;
}
-static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how)
-{
- int ret;
-
- ret = nfs_writepages(mapping, wbc);
- if (ret < 0)
- goto out;
- ret = nfs_sync_mapping_wait(mapping, wbc, how);
- if (ret < 0)
- goto out;
- return 0;
-out:
- __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
- return ret;
-}
-
-/* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */
-static int nfs_write_mapping(struct address_space *mapping, int how)
+/*
+ * flush the inode to disk.
+ */
+int nfs_wb_all(struct inode *inode)
{
struct writeback_control wbc = {
- .bdi = mapping->backing_dev_info,
.sync_mode = WB_SYNC_ALL,
.nr_to_write = LONG_MAX,
.range_start = 0,
.range_end = LLONG_MAX,
};
- return __nfs_write_mapping(mapping, &wbc, how);
-}
-
-/*
- * flush the inode to disk.
- */
-int nfs_wb_all(struct inode *inode)
-{
- return nfs_write_mapping(inode->i_mapping, 0);
-}
-
-int nfs_wb_nocommit(struct inode *inode)
-{
- return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT);
+ return sync_inode(inode, &wbc);
}
int nfs_wb_page_cancel(struct inode *inode, struct page *page)
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 1eec414..3383622 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -33,7 +33,6 @@
#define FLUSH_STABLE 4 /* commit to stable storage */
#define FLUSH_LOWPRI 8 /* low priority background flush */
#define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
-#define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */
#ifdef __KERNEL__
@@ -477,7 +476,6 @@ extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
*/
extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int);
extern int nfs_wb_all(struct inode *inode);
-extern int nfs_wb_nocommit(struct inode *inode);
extern int nfs_wb_page(struct inode *inode, struct page* page);
extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
--
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