korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-11 12:28:41 +08:00
Code Issues Packages Projects Releases Wiki Activity

cifs: flush before set-info if we have writeable handles

Browse Source 
Servers can defer destaging any data and updating the mtime until close().
This means that if we do a setinfo to modify the mtime while other handles
are open for write the server may overwrite our setinfo timestamps when
if flushes the file on close() of the writeable handle.

To solve this we add an explicit flush when the mtime is about to
be updated.

This fixes "cp -p" to preserve mtime when copying a file onto an SMB2 share.

CC: Stable <stable@vger.kernel.org>
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg 2019-07-19 08:12:11 +10:00 committed by Steve French
parent 89a5bfa350
commit aa081859b1
1 changed files with 16 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
fs/cifs/inode.c
View File

@ -2406,6 +2406,8 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
struct inode *inode = d_inode(direntry); struct inode *inode = d_inode(direntry);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifsInodeInfo *cifsInode = CIFS_I(inode); struct cifsInodeInfo *cifsInode = CIFS_I(inode);
struct cifsFileInfo *wfile;
struct cifs_tcon *tcon;
char *full_path = NULL; char *full_path = NULL;
int rc = -EACCES; int rc = -EACCES;
__u32 dosattr = 0; __u32 dosattr = 0;
@ -2452,6 +2454,20 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
mapping_set_error(inode->i_mapping, rc); mapping_set_error(inode->i_mapping, rc);
rc = 0; rc = 0;
if (attrs->ia_valid & ATTR_MTIME) {
rc = cifs_get_writable_file(cifsInode, false, &wfile);
if (!rc) {
tcon = tlink_tcon(wfile->tlink);
rc = tcon->ses->server->ops->flush(xid, tcon, &wfile->fid);
cifsFileInfo_put(wfile);
if (rc)
return rc;
} else if (rc != -EBADF)
return rc;
else
rc = 0;
}
if (attrs->ia_valid & ATTR_SIZE) { if (attrs->ia_valid & ATTR_SIZE) {
rc = cifs_set_file_size(inode, attrs, xid, full_path); rc = cifs_set_file_size(inode, attrs, xid, full_path);
if (rc != 0) if (rc != 0)