fuse: fix attributes after open(O_TRUNC)

The attribute cache for a file was not being cleared when a file is opened
with O_TRUNC.

If the filesystem's open operation truncates the file ("atomic_o_trunc"
feature flag is set) then the kernel should invalidate the cached st_mtime
and st_ctime attributes.

Also i_size should be explicitly be set to zero as it is used sometimes
without refreshing the cache.

Signed-off-by: Ken Sumrall <ksumrall@android.com>
Cc: Anfei <anfei.zhou@gmail.com>
Cc: "Anand V. Avati" <avati@gluster.com>
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c8224587123f6e2ff84c8933f8d56a50ffd06c80..9242d294fe90d382fb7a40f1220923baea71c97e 100644 (file)
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -134,6 +134,7 @@ EXPORT_SYMBOL_GPL(fuse_do_open);
 void fuse_finish_open(struct inode *inode, struct file *file)
 {
        struct fuse_file *ff = file->private_data;
+       struct fuse_conn *fc = get_fuse_conn(inode);
 
        if (ff->open_flags & FOPEN_DIRECT_IO)
                file->f_op = &fuse_direct_io_file_operations;
@@ -141,6 +142,15 @@ void fuse_finish_open(struct inode *inode, struct file *file)
                invalidate_inode_pages2(inode->i_mapping);
        if (ff->open_flags & FOPEN_NONSEEKABLE)
                nonseekable_open(inode, file);
+       if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC)) {
+               struct fuse_inode *fi = get_fuse_inode(inode);
+
+               spin_lock(&fc->lock);
+               fi->attr_version = ++fc->attr_version;
+               i_size_write(inode, 0);
+               spin_unlock(&fc->lock);
+               fuse_invalidate_attr(inode);
+       }
 }
 
 int fuse_open_common(struct inode *inode, struct file *file, bool isdir)