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authorMiklos Szeredi <mszeredi@redhat.com>2018-02-08 15:17:38 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-03 11:21:28 +0200
commit7672380b7d52a86cc54f558f5a93d4dfc595ced3 (patch)
treea192be1bf75a6e4b3e5f3711504d035a11f67fee /fs
parentfc111123fb9e7ae5eb0b85da0646ca1478306eb8 (diff)
fuse: atomic_o_trunc should truncate pagecache
commit df0e91d488276086bc07da2e389986cae0048c37 upstream. Fuse has an "atomic_o_trunc" mode, where userspace filesystem uses the O_TRUNC flag in the OPEN request to truncate the file atomically with the open. In this mode there's no need to send a SETATTR request to userspace after the open, so fuse_do_setattr() checks this mode and returns. But this misses the important step of truncating the pagecache. Add the missing parts of truncation to the ATTR_OPEN branch. Reported-by: Chad Austin <chadaustin@fb.com> Fixes: 6ff958edbf39 ("fuse: add atomic open+truncate support") Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/fuse/dir.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 5068dbf80ff8..49b7b40f7598 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1609,8 +1609,19 @@ int fuse_do_setattr(struct inode *inode, struct iattr *attr,
return err;
if (attr->ia_valid & ATTR_OPEN) {
- if (fc->atomic_o_trunc)
+ /* This is coming from open(..., ... | O_TRUNC); */
+ WARN_ON(!(attr->ia_valid & ATTR_SIZE));
+ WARN_ON(attr->ia_size != 0);
+ if (fc->atomic_o_trunc) {
+ /*
+ * No need to send request to userspace, since actual
+ * truncation has already been done by OPEN. But still
+ * need to truncate page cache.
+ */
+ i_size_write(inode, 0);
+ truncate_pagecache(inode, 0);
return 0;
+ }
file = NULL;
}