| Message ID | 20220701025227.21636-1-sehuww@mail.scut.edu.cn |
|---|---|
| State | New |
| Headers | show |
| Series | [RESEND] ceph: don't truncate file in atomic_open | expand |
On 7/1/22 10:52 AM, Hu Weiwen wrote: > Clear O_TRUNC from the flags sent in the MDS create request. > > `atomic_open' is called before permission check. We should not do any > modification to the file here. The caller will do the truncation > afterward. > > Fixes: 124e68e74099 ("ceph: file operations") > Signed-off-by: Hu Weiwen <sehuww@mail.scut.edu.cn> > --- > rebased onto ceph_client repo testing branch > > fs/ceph/file.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/fs/ceph/file.c b/fs/ceph/file.c > index 296fd1c7ece8..289e66e9cbb0 100644 > --- a/fs/ceph/file.c > +++ b/fs/ceph/file.c > @@ -745,6 +745,11 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry, > err = ceph_wait_on_conflict_unlink(dentry); > if (err) > return err; > + /* > + * Do not truncate the file, since atomic_open is called before the > + * permission check. The caller will do the truncation afterward. > + */ > + flags &= ~O_TRUNC; > > retry: > if (flags & O_CREAT) { > @@ -836,9 +841,7 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry, > set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); > req->r_new_inode = new_inode; > new_inode = NULL; > - err = ceph_mdsc_do_request(mdsc, > - (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, > - req); > + err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req); > if (err == -ENOENT) { > dentry = ceph_handle_snapdir(req, dentry); > if (IS_ERR(dentry)) { Merged it and thanks! -- Xiubo
diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 296fd1c7ece8..289e66e9cbb0 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -745,6 +745,11 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry, err = ceph_wait_on_conflict_unlink(dentry); if (err) return err; + /* + * Do not truncate the file, since atomic_open is called before the + * permission check. The caller will do the truncation afterward. + */ + flags &= ~O_TRUNC; retry: if (flags & O_CREAT) { @@ -836,9 +841,7 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry, set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); req->r_new_inode = new_inode; new_inode = NULL; - err = ceph_mdsc_do_request(mdsc, - (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, - req); + err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req); if (err == -ENOENT) { dentry = ceph_handle_snapdir(req, dentry); if (IS_ERR(dentry)) {
Clear O_TRUNC from the flags sent in the MDS create request. `atomic_open' is called before permission check. We should not do any modification to the file here. The caller will do the truncation afterward. Fixes: 124e68e74099 ("ceph: file operations") Signed-off-by: Hu Weiwen <sehuww@mail.scut.edu.cn> --- rebased onto ceph_client repo testing branch fs/ceph/file.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)