From: Andrew M. <ak...@li...> - 2010-11-11 22:11:23
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On Sat, 30 Oct 2010 13:31:23 +0200 Miklos Szeredi <mi...@sz...> wrote: > Subject: fuse: fix attributes after open(O_TRUNC) > From: Ken Sumrall <ksu...@an...> > > 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 <ksu...@an...> > Cc: Anfei <anf...@gm...> > Cc: "Anand V. Avati" <av...@gl...> > Signed-off-by: Andrew Morton <ak...@li...> > Signed-off-by: Miklos Szeredi <mi...@sz...> > Cc: st...@ke... > --- > > fs/fuse/file.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > Index: linux-2.6/fs/fuse/file.c > =================================================================== > --- linux-2.6.orig/fs/fuse/file.c 2010-10-27 14:04:02.000000000 +0200 > +++ linux-2.6/fs/fuse/file.c 2010-10-30 13:14:07.000000000 +0200 > @@ -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 *inod > 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); i_size_write() requires that i_mutex be held, as described at the i_size_write() definition site. Is it reliably the case that i_mutex is held here? > + spin_unlock(&fc->lock); > + fuse_invalidate_attr(inode); > + } > } > > int fuse_open_common(struct inode *inode, struct file *file, bool isdir) |