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| author | Miklos Szeredi | 2013-10-01 16:44:53 +0200 |
|---|---|---|
| committer | Miklos Szeredi | 2013-10-01 16:44:53 +0200 |
| commit | ff17be0864777fe0dfb0a477868a8cb95c1ff90e (patch) | |
| tree | e45109ae17eee26119d3b4d51f5282067aef09b0 | |
| parent | fuse: writepages: handle same page rewrites (diff) | |
| download | kernel-qcow2-linux-ff17be0864777fe0dfb0a477868a8cb95c1ff90e.tar.gz kernel-qcow2-linux-ff17be0864777fe0dfb0a477868a8cb95c1ff90e.tar.xz kernel-qcow2-linux-ff17be0864777fe0dfb0a477868a8cb95c1ff90e.zip | |
fuse: writepage: skip already in flight
If ->writepage() tries to write back a page whose copy is still in flight,
then just skip by calling redirty_page_for_writepage().
This is OK, since now ->writepage() should never be called for data
integrity sync.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
| -rw-r--r-- | fs/fuse/file.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index f8ff019cc6ec..135360e2b9e5 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -1591,6 +1591,18 @@ static int fuse_writepage(struct page *page, struct writeback_control *wbc) { int err; + if (fuse_page_is_writeback(page->mapping->host, page->index)) { + /* + * ->writepages() should be called for sync() and friends. We + * should only get here on direct reclaim and then we are + * allowed to skip a page which is already in flight + */ + WARN_ON(wbc->sync_mode == WB_SYNC_ALL); + + redirty_page_for_writepage(wbc, page); + return 0; + } + err = fuse_writepage_locked(page); unlock_page(page); |