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smb: cilent: set reparse mount points as automounts

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By doing so we can selectively mark those submounts as 'noserverino'
rather than whole mount and thus avoiding inode collisions in them.

Consider a "test" SMB share that has two mounted NTFS volumes
(vol0 & vol1) inside it.

* Before patch

$ mount.cifs //srv/test /mnt/1 -o ...,serverino
$ ls -li /mnt/1/vol0
total 1
281474976710693 drwxr-xr-x 2 root root 0 Jul 15 00:23 $RECYCLE.BIN
281474976710696 drwxr-xr-x 2 root root 0 Jul 18 18:23 System Volume...
281474976710699 -rwxr-xr-x 1 root root 0 Aug 14 21:53 f0
281474976710700 -rwxr-xr-x 1 root root 0 Aug 15 18:52 f2
281474976710698 drwxr-xr-x 2 root root 0 Aug 12 19:39 foo
281474976710692 -rwxr-xr-x 1 root root 5 Aug  4 21:18 vol0_f0.txt
$ ls -li /mnt/1/vol1
total 0
281474976710693 drwxr-xr-x 2 root root 0 Jul 15 00:23 $RECYCLE.BIN
281474976710696 drwxr-xr-x 2 root root 0 Jul 18 18:23 System Volume...
281474976710698 drwxr-xr-x 2 root root 0 Aug 12 19:39 bar
281474976710699 -rwxr-xr-x 1 root root 0 Aug 14 22:03 f0
281474976710700 -rwxr-xr-x 1 root root 0 Aug 14 22:52 f1
281474976710692 -rwxr-xr-x 1 root root 0 Jul 15 00:23 vol1_f0.txt

* After patch

$ mount.cifs //srv/test /mnt/1 -o ...,serverino
$ ls -li /mnt/1/vol0
total 1
590 drwxr-xr-x 2 root root 0 Jul 15 00:23 $RECYCLE.BIN
594 drwxr-xr-x 2 root root 0 Jul 18 18:23 System Volume Information
591 -rwxr-xr-x 1 root root 0 Aug 14 21:53 f0
592 -rwxr-xr-x 1 root root 0 Aug 15 18:52 f2
593 drwxr-xr-x 2 root root 0 Aug 12 19:39 foo
595 -rwxr-xr-x 1 root root 5 Aug  4 21:18 vol0_f0.txt
$ ls -li /mnt/1/vol1
total 0
596 drwxr-xr-x 2 root root 0 Jul 15 00:23 $RECYCLE.BIN
600 drwxr-xr-x 2 root root 0 Jul 18 18:23 System Volume Information
597 drwxr-xr-x 2 root root 0 Aug 12 19:39 bar
598 -rwxr-xr-x 1 root root 0 Aug 14 22:03 f0
599 -rwxr-xr-x 1 root root 0 Aug 14 22:52 f1
601 -rwxr-xr-x 1 root root 0 Jul 15 00:23 vol1_f0.txt

Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara 2023-08-17 12:34:09 -03:00 committed by Steve French
parent f2762ae4d3
commit a18280e7fd
4 changed files with 196 additions and 174 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/smb/client/cifsglob.h
View File

@ -1094,7 +1094,7 @@ cap_unix(struct cifs_ses *ses)
* inode with new info
*/
#define CIFS_FATTR_DFS_REFERRAL 0x1
#define CIFS_FATTR_JUNCTION 0x1
#define CIFS_FATTR_DELETE_PENDING 0x2
#define CIFS_FATTR_NEED_REVAL 0x4
#define CIFS_FATTR_INO_COLLISION 0x8

348
fs/smb/client/inode.c
View File

@ -214,7 +214,7 @@ cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
}
spin_unlock(&inode->i_lock);
if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
if (fattr->cf_flags & CIFS_FATTR_JUNCTION)
inode->i_flags |= S_AUTOMOUNT;
if (inode->i_state & I_NEW)
cifs_set_ops(inode);
@ -323,14 +323,14 @@ cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
*
* Needed to setup cifs_fattr data for the directory which is the
* junction to the new submount (ie to setup the fake directory
* which represents a DFS referral).
* which represents a DFS referral or reparse mount point).
*/
static void
cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
static void cifs_create_junction_fattr(struct cifs_fattr *fattr,
struct super_block *sb)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
cifs_dbg(FYI, "creating fake fattr for DFS referral\n");
cifs_dbg(FYI, "%s: creating fake fattr\n", __func__);
memset(fattr, 0, sizeof(*fattr));
fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
@ -339,7 +339,33 @@ cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
ktime_get_coarse_real_ts64(&fattr->cf_mtime);
fattr->cf_atime = fattr->cf_ctime = fattr->cf_mtime;
fattr->cf_nlink = 2;
fattr->cf_flags = CIFS_FATTR_DFS_REFERRAL;
fattr->cf_flags = CIFS_FATTR_JUNCTION;
}
/* Update inode with final fattr data */
static int update_inode_info(struct super_block *sb,
struct cifs_fattr *fattr,
struct inode **inode)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
int rc = 0;
if (!*inode) {
*inode = cifs_iget(sb, fattr);
if (!*inode)
rc = -ENOMEM;
return rc;
}
/* We already have inode, update it.
*
* If file type or uniqueid is different, return error.
*/
if (unlikely((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
CIFS_I(*inode)->uniqueid != fattr->cf_uniqueid)) {
CIFS_I(*inode)->time = 0; /* force reval */
return -ESTALE;
}
return cifs_fattr_to_inode(*inode, fattr);
}
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
@ -369,7 +395,7 @@ cifs_get_file_info_unix(struct file *filp)
if (!rc) {
cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
} else if (rc == -EREMOTE) {
cifs_create_dfs_fattr(&fattr, inode->i_sb);
cifs_create_junction_fattr(&fattr, inode->i_sb);
rc = 0;
} else
goto cifs_gfiunix_out;
@ -381,17 +407,18 @@ cifs_gfiunix_out:
return rc;
}
int cifs_get_inode_info_unix(struct inode **pinode,
const unsigned char *full_path,
struct super_block *sb, unsigned int xid)
static int cifs_get_unix_fattr(const unsigned char *full_path,
struct super_block *sb,
struct cifs_fattr *fattr,
struct inode **pinode,
const unsigned int xid)
{
int rc;
FILE_UNIX_BASIC_INFO find_data;
struct cifs_fattr fattr;
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
struct tcon_link *tlink;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
FILE_UNIX_BASIC_INFO find_data;
struct cifs_tcon *tcon;
struct tcon_link *tlink;
int rc, tmprc;
cifs_dbg(FYI, "Getting info on %s\n", full_path);
@ -408,59 +435,61 @@ int cifs_get_inode_info_unix(struct inode **pinode,
cifs_put_tlink(tlink);
if (!rc) {
cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
cifs_unix_basic_to_fattr(fattr, &find_data, cifs_sb);
} else if (rc == -EREMOTE) {
cifs_create_dfs_fattr(&fattr, sb);
cifs_create_junction_fattr(fattr, sb);
rc = 0;
} else {
return rc;
}
if (!*pinode)
cifs_fill_uniqueid(sb, fattr);
/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
int tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
full_path);
if (tmprc)
cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
tmprc = check_mf_symlink(xid, tcon, cifs_sb, fattr, full_path);
cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
}
if (S_ISLNK(fattr.cf_mode) && !fattr.cf_symlink_target) {
if (S_ISLNK(fattr->cf_mode) && !fattr->cf_symlink_target) {
if (!server->ops->query_symlink)
return -EOPNOTSUPP;
rc = server->ops->query_symlink(xid, tcon, cifs_sb, full_path,
&fattr.cf_symlink_target, NULL);
if (rc) {
cifs_dbg(FYI, "%s: query_symlink: %d\n", __func__, rc);
goto cgiiu_exit;
}
rc = server->ops->query_symlink(xid, tcon,
cifs_sb, full_path,
&fattr->cf_symlink_target,
NULL);
cifs_dbg(FYI, "%s: query_symlink: %d\n", __func__, rc);
}
return rc;
}
if (*pinode == NULL) {
/* get new inode */
cifs_fill_uniqueid(sb, &fattr);
*pinode = cifs_iget(sb, &fattr);
if (!*pinode)
rc = -ENOMEM;
} else {
/* we already have inode, update it */
int cifs_get_inode_info_unix(struct inode **pinode,
const unsigned char *full_path,
struct super_block *sb, unsigned int xid)
{
struct cifs_fattr fattr = {};
int rc;
/* if uniqueid is different, return error */
if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
CIFS_I(*pinode)->uniqueid != fattr.cf_uniqueid)) {
CIFS_I(*pinode)->time = 0; /* force reval */
rc = -ESTALE;
goto cgiiu_exit;
}
rc = cifs_get_unix_fattr(full_path, sb, &fattr, pinode, xid);
if (rc)
goto out;
/* if filetype is different, return error */
rc = cifs_fattr_to_inode(*pinode, &fattr);
}
cgiiu_exit:
rc = update_inode_info(sb, &fattr, pinode);
out:
kfree(fattr.cf_symlink_target);
return rc;
}
#else
static inline int cifs_get_unix_fattr(const unsigned char *full_path,
struct super_block *sb,
struct cifs_fattr *fattr,
struct inode **pinode,
const unsigned int xid)
{
return -EOPNOTSUPP;
}
int cifs_get_inode_info_unix(struct inode **pinode,
const unsigned char *full_path,
struct super_block *sb, unsigned int xid)
@ -826,7 +855,7 @@ cifs_get_file_info(struct file *filp)
cifs_open_info_to_fattr(&fattr, &data, inode->i_sb);
break;
case -EREMOTE:
cifs_create_dfs_fattr(&fattr, inode->i_sb);
cifs_create_junction_fattr(&fattr, inode->i_sb);
rc = 0;
break;
case -EOPNOTSUPP:
@ -979,12 +1008,12 @@ static inline bool is_inode_cache_good(struct inode *ino)
return ino && CIFS_CACHE_READ(CIFS_I(ino)) && CIFS_I(ino)->time != 0;
}
static int query_reparse(struct cifs_open_info_data *data,
struct super_block *sb,
const unsigned int xid,
struct cifs_tcon *tcon,
const char *full_path,
struct cifs_fattr *fattr)
static int reparse_info_to_fattr(struct cifs_open_info_data *data,
struct super_block *sb,
const unsigned int xid,
struct cifs_tcon *tcon,
const char *full_path,
struct cifs_fattr *fattr)
{
struct TCP_Server_Info *server = tcon->ses->server;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
@ -1013,21 +1042,29 @@ static int query_reparse(struct cifs_open_info_data *data,
iov);
}
break;
case IO_REPARSE_TAG_MOUNT_POINT:
cifs_create_junction_fattr(fattr, sb);
goto out;
}
cifs_open_info_to_fattr(fattr, data, sb);
out:
free_rsp_buf(rsp_buftype, rsp_iov.iov_base);
return rc;
}
int cifs_get_inode_info(struct inode **inode, const char *full_path,
struct cifs_open_info_data *data, struct super_block *sb, int xid,
const struct cifs_fid *fid)
static int cifs_get_fattr(struct cifs_open_info_data *data,
struct super_block *sb, int xid,
const struct cifs_fid *fid,
struct cifs_fattr *fattr,
struct inode **inode,
const char *full_path)
{
struct cifs_open_info_data tmp_data = {};
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
struct tcon_link *tlink;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifs_fattr fattr = {0};
struct cifs_open_info_data tmp_data = {};
void *smb1_backup_rsp_buf = NULL;
int rc = 0;
int tmprc = 0;
@ -1043,10 +1080,6 @@ int cifs_get_inode_info(struct inode **inode, const char *full_path,
*/
if (!data) {
if (is_inode_cache_good(*inode)) {
cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
goto out;
}
rc = server->ops->query_path_info(xid, tcon, cifs_sb,
full_path, &tmp_data);
data = &tmp_data;
@ -1064,15 +1097,15 @@ int cifs_get_inode_info(struct inode **inode, const char *full_path,
* special file type e.g. symlink or fifo or char etc.
*/
if (cifs_open_data_reparse(data)) {
rc = query_reparse(data, sb, xid, tcon,
full_path, &fattr);
rc = reparse_info_to_fattr(data, sb, xid, tcon,
full_path, fattr);
} else {
cifs_open_info_to_fattr(fattr, data, sb);
}
if (!rc)
cifs_open_info_to_fattr(&fattr, data, sb);
break;
case -EREMOTE:
/* DFS link, no metadata available on this server */
cifs_create_dfs_fattr(&fattr, sb);
cifs_create_junction_fattr(fattr, sb);
rc = 0;
break;
case -EACCES:
@ -1102,8 +1135,8 @@ int cifs_get_inode_info(struct inode **inode, const char *full_path,
fdi = (FILE_DIRECTORY_INFO *)fi;
si = (SEARCH_ID_FULL_DIR_INFO *)fi;
cifs_dir_info_to_fattr(&fattr, fdi, cifs_sb);
fattr.cf_uniqueid = le64_to_cpu(si->UniqueId);
cifs_dir_info_to_fattr(fattr, fdi, cifs_sb);
fattr->cf_uniqueid = le64_to_cpu(si->UniqueId);
/* uniqueid set, skip get inum step */
goto handle_mnt_opt;
} else {
@ -1120,10 +1153,10 @@ int cifs_get_inode_info(struct inode **inode, const char *full_path,
}
/*
* 3. Get or update inode number (fattr.cf_uniqueid)
* 3. Get or update inode number (fattr->cf_uniqueid)
*/
cifs_set_fattr_ino(xid, tcon, sb, inode, full_path, data, &fattr);
cifs_set_fattr_ino(xid, tcon, sb, inode, full_path, data, fattr);
/*
* 4. Tweak fattr based on mount options
@ -1132,17 +1165,17 @@ int cifs_get_inode_info(struct inode **inode, const char *full_path,
handle_mnt_opt:
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
/* query for SFU type info if supported and needed */
if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
if ((fattr->cf_cifsattrs & ATTR_SYSTEM) &&
(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
tmprc = cifs_sfu_type(fattr, full_path, cifs_sb, xid);
if (tmprc)
cifs_dbg(FYI, "cifs_sfu_type failed: %d\n", tmprc);
}
/* fill in 0777 bits from ACL */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) {
rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, true,
full_path, fid);
rc = cifs_acl_to_fattr(cifs_sb, fattr, *inode,
true, full_path, fid);
if (rc == -EREMOTE)
rc = 0;
if (rc) {
@ -1151,8 +1184,8 @@ handle_mnt_opt:
goto out;
}
} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, false,
full_path, fid);
rc = cifs_acl_to_fattr(cifs_sb, fattr, *inode,
false, full_path, fid);
if (rc == -EREMOTE)
rc = 0;
if (rc) {
@ -1164,58 +1197,57 @@ handle_mnt_opt:
/* fill in remaining high mode bits e.g. SUID, VTX */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
cifs_sfu_mode(fattr, full_path, cifs_sb, xid);
/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
full_path);
if (tmprc)
cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
tmprc = check_mf_symlink(xid, tcon, cifs_sb, fattr, full_path);
cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
}
/*
* 5. Update inode with final fattr data
*/
if (!*inode) {
*inode = cifs_iget(sb, &fattr);
if (!*inode)
rc = -ENOMEM;
} else {
/* we already have inode, update it */
/* if uniqueid is different, return error */
if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
CIFS_I(*inode)->uniqueid != fattr.cf_uniqueid)) {
CIFS_I(*inode)->time = 0; /* force reval */
rc = -ESTALE;
goto out;
}
/* if filetype is different, return error */
rc = cifs_fattr_to_inode(*inode, &fattr);
}
out:
cifs_buf_release(smb1_backup_rsp_buf);
cifs_put_tlink(tlink);
cifs_free_open_info(&tmp_data);
return rc;
}
int cifs_get_inode_info(struct inode **inode,
const char *full_path,
struct cifs_open_info_data *data,
struct super_block *sb, int xid,
const struct cifs_fid *fid)
{
struct cifs_fattr fattr = {};
int rc;
if (is_inode_cache_good(*inode)) {
cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
return 0;
}
rc = cifs_get_fattr(data, sb, xid, fid, &fattr, inode, full_path);
if (rc)
goto out;
rc = update_inode_info(sb, &fattr, inode);
out:
kfree(fattr.cf_symlink_target);
return rc;
}
int
smb311_posix_get_inode_info(struct inode **inode,
const char *full_path,
struct super_block *sb, unsigned int xid)
static int smb311_posix_get_fattr(struct cifs_fattr *fattr,
const char *full_path,
struct super_block *sb,
const unsigned int xid)
{
struct cifs_open_info_data data = {};
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifs_tcon *tcon;
struct tcon_link *tlink;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifs_fattr fattr = {0};
struct cifs_open_info_data data = {};
struct cifs_sid owner, group;
int rc = 0;
int tmprc = 0;
int tmprc;
int rc;
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
@ -1226,11 +1258,6 @@ smb311_posix_get_inode_info(struct inode **inode,
* 1. Fetch file metadata
*/
if (is_inode_cache_good(*inode)) {
cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
goto out;
}
rc = smb311_posix_query_path_info(xid, tcon, cifs_sb,
full_path, &data,
&owner, &group);
@ -1241,11 +1268,11 @@ smb311_posix_get_inode_info(struct inode **inode,
switch (rc) {
case 0:
smb311_posix_info_to_fattr(&fattr, &data, &owner, &group, sb);
smb311_posix_info_to_fattr(fattr, &data, &owner, &group, sb);
break;
case -EREMOTE:
/* DFS link, no metadata available on this server */
cifs_create_dfs_fattr(&fattr, sb);
cifs_create_junction_fattr(fattr, sb);
rc = 0;
break;
case -EACCES:
@ -1261,48 +1288,41 @@ smb311_posix_get_inode_info(struct inode **inode,
goto out;
}
/*
* 3. Tweak fattr based on mount options
*/
/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
full_path);
if (tmprc)
cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
tmprc = check_mf_symlink(xid, tcon, cifs_sb, fattr, full_path);
cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
}
/*
* 4. Update inode with final fattr data
*/
if (!*inode) {
*inode = cifs_iget(sb, &fattr);
if (!*inode)
rc = -ENOMEM;
} else {
/* we already have inode, update it */
/* if uniqueid is different, return error */
if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
CIFS_I(*inode)->uniqueid != fattr.cf_uniqueid)) {
CIFS_I(*inode)->time = 0; /* force reval */
rc = -ESTALE;
goto out;
}
/* if filetype is different, return error */
rc = cifs_fattr_to_inode(*inode, &fattr);
}
out:
cifs_put_tlink(tlink);
cifs_free_open_info(&data);
kfree(fattr.cf_symlink_target);
return rc;
}
int smb311_posix_get_inode_info(struct inode **inode, const char *full_path,
struct super_block *sb, const unsigned int xid)
{
struct cifs_fattr fattr = {};
int rc;
if (is_inode_cache_good(*inode)) {
cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
return 0;
}
rc = smb311_posix_get_fattr(&fattr, full_path, sb, xid);
if (rc)
goto out;
rc = update_inode_info(sb, &fattr, inode);
out:
kfree(fattr.cf_symlink_target);
return rc;
}
static const struct inode_operations cifs_ipc_inode_ops = {
.lookup = cifs_lookup,
@ -1407,13 +1427,14 @@ retry_iget5_locked:
/* gets root inode */
struct inode *cifs_root_iget(struct super_block *sb)
{
unsigned int xid;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct inode *inode = NULL;
long rc;
struct cifs_fattr fattr = {};
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
struct inode *inode = NULL;
unsigned int xid;
char *path = NULL;
int len;
int rc;
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
&& cifs_sb->prepath) {
@ -1431,21 +1452,29 @@ struct inode *cifs_root_iget(struct super_block *sb)
xid = get_xid();
if (tcon->unix_ext) {
rc = cifs_get_inode_info_unix(&inode, path, sb, xid);
rc = cifs_get_unix_fattr(path, sb, &fattr, &inode, xid);
/* some servers mistakenly claim POSIX support */
if (rc != -EOPNOTSUPP)
goto iget_no_retry;
goto iget_root;
cifs_dbg(VFS, "server does not support POSIX extensions\n");
tcon->unix_ext = false;
}
convert_delimiter(path, CIFS_DIR_SEP(cifs_sb));
if (tcon->posix_extensions)
rc = smb311_posix_get_inode_info(&inode, path, sb, xid);
rc = smb311_posix_get_fattr(&fattr, path, sb, xid);
else
rc = cifs_get_inode_info(&inode, path, NULL, sb, xid, NULL);
rc = cifs_get_fattr(NULL, sb, xid, NULL, &fattr, &inode, path);
iget_root:
if (!rc) {
if (fattr.cf_flags & CIFS_FATTR_JUNCTION) {
fattr.cf_flags &= ~CIFS_FATTR_JUNCTION;
cifs_autodisable_serverino(cifs_sb);
}
inode = cifs_iget(sb, &fattr);
}
iget_no_retry:
if (!inode) {
inode = ERR_PTR(rc);
goto out;
@ -1469,6 +1498,7 @@ iget_no_retry:
out:
kfree(path);
free_xid(xid);
kfree(fattr.cf_symlink_target);
return inode;
}

19
fs/smb/client/namespace.c
View File

@ -126,9 +126,11 @@ static char *automount_fullpath(struct dentry *dentry, void *page)
char *s;
spin_lock(&tcon->tc_lock);
if (unlikely(!tcon->origin_fullpath)) {
if (!tcon->origin_fullpath) {
spin_unlock(&tcon->tc_lock);
return ERR_PTR(-EREMOTE);
return build_path_from_dentry_optional_prefix(dentry,
page,
true);
}
spin_unlock(&tcon->tc_lock);
@ -162,7 +164,6 @@ static struct vfsmount *cifs_do_automount(struct path *path)
int rc;
struct dentry *mntpt = path->dentry;
struct fs_context *fc;
struct cifs_sb_info *cifs_sb;
void *page = NULL;
struct smb3_fs_context *ctx, *cur_ctx;
struct smb3_fs_context tmp;
@ -172,17 +173,7 @@ static struct vfsmount *cifs_do_automount(struct path *path)
if (IS_ROOT(mntpt))
return ERR_PTR(-ESTALE);
/*
* The MSDFS spec states that paths in DFS referral requests and
* responses must be prefixed by a single '\' character instead of
* the double backslashes usually used in the UNC. This function
* gives us the latter, so we must adjust the result.
*/
cifs_sb = CIFS_SB(mntpt->d_sb);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
return ERR_PTR(-EREMOTE);
cur_ctx = cifs_sb->ctx;
cur_ctx = CIFS_SB(mntpt->d_sb)->ctx;
fc = fs_context_for_submount(path->mnt->mnt_sb->s_type, mntpt);
if (IS_ERR(fc))

1
fs/smb/client/readdir.c
View File

@ -143,6 +143,7 @@ static bool reparse_file_needs_reval(const struct cifs_fattr *fattr)
case IO_REPARSE_TAG_DFSR:
case IO_REPARSE_TAG_SYMLINK:
case IO_REPARSE_TAG_NFS:
case IO_REPARSE_TAG_MOUNT_POINT:
case 0:
return true;
}