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| author | Maxim Patlasov <MPatlasov@parallels.com> | 2013-10-10 17:11:54 +0400 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@suse.cz> | 2014-04-02 15:38:50 +0200 |
| commit | fe38d7df230b022e72014ef7aa799a4f2acfecf3 (patch) | |
| tree | 58ac02af5d0c373b85841f355dc0f4b5641fb885 | |
| parent | 6b12c1b37e5556af073c1ebfa04c1f9df3a2beaf (diff) | |
| download | linux-fe38d7df230b022e72014ef7aa799a4f2acfecf3.tar.bz2 | |
fuse: fuse_flush() should wait on writeback
The aim of .flush fop is to hint file-system that flushing its state or caches
or any other important data to reliable storage would be desirable now.
fuse_flush() passes this hint by sending FUSE_FLUSH request to userspace.
However, dirty pages and pages under writeback may be not visible to userspace
yet if we won't ensure it explicitly.
Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
| -rw-r--r-- | fs/fuse/file.c | 38 |
1 files changed, 23 insertions, 15 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index d8575304c062..d93f2a1aa7de 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -401,6 +401,21 @@ static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index) return 0; } +/* + * Wait for all pending writepages on the inode to finish. + * + * This is currently done by blocking further writes with FUSE_NOWRITE + * and waiting for all sent writes to complete. + * + * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage + * could conflict with truncation. + */ +static void fuse_sync_writes(struct inode *inode) +{ + fuse_set_nowrite(inode); + fuse_release_nowrite(inode); +} + static int fuse_flush(struct file *file, fl_owner_t id) { struct inode *inode = file_inode(file); @@ -416,6 +431,14 @@ static int fuse_flush(struct file *file, fl_owner_t id) if (fc->no_flush) return 0; + err = filemap_write_and_wait(file->f_mapping); + if (err) + return err; + + mutex_lock(&inode->i_mutex); + fuse_sync_writes(inode); + mutex_unlock(&inode->i_mutex); + req = fuse_get_req_nofail_nopages(fc, file); memset(&inarg, 0, sizeof(inarg)); inarg.fh = ff->fh; @@ -436,21 +459,6 @@ static int fuse_flush(struct file *file, fl_owner_t id) return err; } -/* - * Wait for all pending writepages on the inode to finish. - * - * This is currently done by blocking further writes with FUSE_NOWRITE - * and waiting for all sent writes to complete. - * - * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage - * could conflict with truncation. - */ -static void fuse_sync_writes(struct inode *inode) -{ - fuse_set_nowrite(inode); - fuse_release_nowrite(inode); -} - int fuse_fsync_common(struct file *file, loff_t start, loff_t end, int datasync, int isdir) { |