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authorAmir Goldstein <amir73il@gmail.com>2021-10-24 16:26:07 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2021-10-28 10:20:31 +0200
commita390ccb316beb8ea594b8695d53926710ca454a3 (patch)
tree3df484d4fcff192feeb7b182097e8f4b5fa588ac /fs/fuse
parentc6c745b81033a4c1f0e5f3b16398a10f2d000c29 (diff)
downloadlinux-a390ccb316beb8ea594b8695d53926710ca454a3.tar.bz2
fuse: add FOPEN_NOFLUSH
Add flag returned by FUSE_OPEN and FUSE_CREATE requests to avoid flushing data cache on close. Different filesystems implement ->flush() is different ways: - Most disk filesystems do not implement ->flush() at all - Some network filesystem (e.g. nfs) flush local write cache of FMODE_WRITE file and send a "flush" command to server - Some network filesystem (e.g. cifs) flush local write cache of FMODE_WRITE file without sending an additional command to server FUSE flushes local write cache of ANY file, even non FMODE_WRITE and sends a "flush" command to server (if server implements it). The FUSE implementation of ->flush() seems over agressive and arbitrary and does not make a lot of sense when writeback caching is disabled. Instead of deciding on another arbitrary implementation that makes sense, leave the choice of per-file flush behavior in the hands of the server. Link: https://lore.kernel.org/linux-fsdevel/CAJfpegspE8e6aKd47uZtSYX8Y-1e1FWS0VL0DH2Skb9gQP5RJQ@mail.gmail.com/ Suggested-by: Miklos Szeredi <mszeredi@redhat.com> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/file.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 26730e699d68..b7f1a164e18a 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -476,6 +476,9 @@ static int fuse_flush(struct file *file, fl_owner_t id)
if (fuse_is_bad(inode))
return -EIO;
+ if (ff->open_flags & FOPEN_NOFLUSH && !fm->fc->writeback_cache)
+ return 0;
+
err = write_inode_now(inode, 1);
if (err)
return err;