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cifs: auto disable 'serverino' in dfs mounts

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Different servers have different set of file ids.

After failover, unique IDs will be different so we can't validate
them.

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Paulo Alcantara <palcantara@suse.de>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Aurelien Aptel 2018-11-16 16:13:25 +01:00 committed by Steve French
parent d9345e0ae7
commit 5fc7fcd054
3 changed files with 35 additions and 25 deletions
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6
fs/cifs/connect.c
View File

@ -4220,6 +4220,12 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *vol)
if (rc)
goto error;
/*
* After reconnecting to a different server, unique ids won't
* match anymore, so we disable serverino. This prevents
* dentry revalidation to think the dentry are stale (ESTALE).
*/
cifs_autodisable_serverino(cifs_sb);
out:
free_xid(xid);
return mount_setup_tlink(cifs_sb, ses, tcon);

42
fs/cifs/inode.c
View File

@ -730,7 +730,6 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
FILE_ALL_INFO *data, struct super_block *sb, int xid,
const struct cifs_fid *fid)
{
bool validinum = false;
__u16 srchflgs;
int rc = 0, tmprc = ENOSYS;
struct cifs_tcon *tcon;
@ -821,7 +820,6 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
(FILE_DIRECTORY_INFO *)data, cifs_sb);
fattr.cf_uniqueid = le64_to_cpu(
((SEARCH_ID_FULL_DIR_INFO *)data)->UniqueId);
validinum = true;
cifs_buf_release(srchinf->ntwrk_buf_start);
}
@ -840,31 +838,29 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
*/
if (*inode == NULL) {
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
if (validinum == false) {
if (server->ops->get_srv_inum)
tmprc = server->ops->get_srv_inum(xid,
tcon, cifs_sb, full_path,
&fattr.cf_uniqueid, data);
if (tmprc) {
cifs_dbg(FYI, "GetSrvInodeNum rc %d\n",
tmprc);
fattr.cf_uniqueid = iunique(sb, ROOT_I);
cifs_autodisable_serverino(cifs_sb);
} else if ((fattr.cf_uniqueid == 0) &&
strlen(full_path) == 0) {
/* some servers ret bad root ino ie 0 */
cifs_dbg(FYI, "Invalid (0) inodenum\n");
fattr.cf_flags |=
CIFS_FATTR_FAKE_ROOT_INO;
fattr.cf_uniqueid =
simple_hashstr(tcon->treeName);
}
if (server->ops->get_srv_inum)
tmprc = server->ops->get_srv_inum(xid,
tcon, cifs_sb, full_path,
&fattr.cf_uniqueid, data);
if (tmprc) {
cifs_dbg(FYI, "GetSrvInodeNum rc %d\n",
tmprc);
fattr.cf_uniqueid = iunique(sb, ROOT_I);
cifs_autodisable_serverino(cifs_sb);
} else if ((fattr.cf_uniqueid == 0) &&
strlen(full_path) == 0) {
/* some servers ret bad root ino ie 0 */
cifs_dbg(FYI, "Invalid (0) inodenum\n");
fattr.cf_flags |=
CIFS_FATTR_FAKE_ROOT_INO;
fattr.cf_uniqueid =
simple_hashstr(tcon->treeName);
}
} else
fattr.cf_uniqueid = iunique(sb, ROOT_I);
} else {
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
validinum == false && server->ops->get_srv_inum) {
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
&& server->ops->get_srv_inum) {
/*
* Pass a NULL tcon to ensure we don't make a round
* trip to the server. This only works for SMB2+.

12
fs/cifs/misc.c
View File

@ -525,9 +525,17 @@ void
cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
{
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
struct cifs_tcon *tcon = NULL;
if (cifs_sb->master_tlink)
tcon = cifs_sb_master_tcon(cifs_sb);
cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s. This server doesn't seem to support them properly. Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n",
cifs_sb_master_tcon(cifs_sb)->treeName);
cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s.\n",
tcon ? tcon->treeName : "new server");
cifs_dbg(VFS, "The server doesn't seem to support them properly or the files might be on different servers (DFS).\n");
cifs_dbg(VFS, "Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n");
}
}