@@ -58,8 +58,6 @@ struct cifs_sb_info {
mode_t mnt_file_mode;
mode_t mnt_dir_mode;
unsigned int mnt_cifs_flags;
- int prepathlen;
- char *prepath; /* relative path under the share to mount to */
char *mountdata; /* options received at mount time or via DFS refs */
struct backing_dev_info bdi;
struct delayed_work prune_tlinks;
@@ -434,8 +434,6 @@ cifs_show_options(struct seq_file *s, struct vfsmount *m)
seq_printf(s, ",nocase");
if (tcon->retry)
seq_printf(s, ",hard");
- if (cifs_sb->prepath)
- seq_printf(s, ",prepath=%s", cifs_sb->prepath);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
seq_printf(s, ",posixpaths");
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
@@ -549,6 +547,92 @@ static const struct super_operations cifs_super_ops = {
#endif
};
+/*
+ * Get root dentry from superblock according to prefix path mount option.
+ * Return dentry with refcount + 1 on success and NULL otherwise.
+ */
+static struct dentry *
+cifs_get_root(struct smb_vol *vol, struct super_block *sb)
+{
+ int xid, rc;
+ struct inode *inode;
+ struct qstr name;
+ struct dentry *dparent = NULL, *dchild = NULL;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ unsigned int i, full_len, len;
+ char *full_path = NULL, *pstart;
+ char sep;
+
+ full_path = cifs_build_path_to_root(vol, cifs_sb,
+ cifs_sb_master_tcon(cifs_sb));
+ if (full_path == NULL)
+ return NULL;
+
+ cFYI(1, "Get root dentry for %s", full_path);
+
+ xid = GetXid();
+ sep = CIFS_DIR_SEP(cifs_sb);
+ dparent = dget(sb->s_root);
+ full_len = strlen(full_path);
+ full_path[full_len] = sep;
+ pstart = full_path + 1;
+
+ for (i = 1, len = 0; i <= full_len; i++) {
+ if (full_path[i] != sep || !len) {
+ len++;
+ continue;
+ }
+
+ full_path[i] = 0;
+ cFYI(1, "get dentry for %s", pstart);
+
+ name.name = pstart;
+ name.len = len;
+ name.hash = full_name_hash(pstart, len);
+ dchild = d_lookup(dparent, &name);
+ if (dchild == NULL) {
+ cFYI(1, "not exists");
+ dchild = d_alloc(dparent, &name);
+ if (dchild == NULL) {
+ dput(dparent);
+ dparent = NULL;
+ goto out;
+ }
+ }
+
+ cFYI(1, "get inode");
+ if (dchild->d_inode == NULL) {
+ cFYI(1, "not exists");
+ inode = NULL;
+ if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
+ rc = cifs_get_inode_info_unix(&inode, full_path,
+ sb, xid);
+ else
+ rc = cifs_get_inode_info(&inode, full_path,
+ NULL, sb, xid, NULL);
+ if (rc) {
+ dput(dchild);
+ dput(dparent);
+ dparent = NULL;
+ goto out;
+ }
+ d_add(dchild, inode);
+ }
+ cFYI(1, "parent %p, child %p", dparent, dchild);
+
+ dput(dparent);
+ dparent = dchild;
+ len = 0;
+ pstart = full_path + i + 1;
+ full_path[i] = sep;
+ }
+out:
+ _FreeXid(xid);
+ full_path[full_len] = 0;
+ kfree(full_path);
+ return dparent;
+}
+
static struct dentry *
cifs_do_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
@@ -603,7 +687,12 @@ cifs_do_mount(struct file_system_type *fs_type,
sb->s_flags |= MS_ACTIVE;
- root = dget(sb->s_root);
+ root = cifs_get_root(volume_info, sb);
+ if (root == NULL) {
+ kfree(copied_data);
+ goto err_out;
+ }
+ cFYI(1, "dentry root is: %p", root);
out:
cifs_cleanup_volume_info(&volume_info);
return root;
@@ -158,6 +158,62 @@ struct cifs_cred {
*****************************************************************
*/
+struct smb_vol {
+ char *username;
+ char *password;
+ char *domainname;
+ char *UNC;
+ char *UNCip;
+ char *iocharset; /* local code page for mapping to and from Unicode */
+ char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
+ char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
+ uid_t cred_uid;
+ uid_t linux_uid;
+ gid_t linux_gid;
+ mode_t file_mode;
+ mode_t dir_mode;
+ unsigned secFlg;
+ bool retry:1;
+ bool intr:1;
+ bool setuids:1;
+ bool override_uid:1;
+ bool override_gid:1;
+ bool dynperm:1;
+ bool noperm:1;
+ bool no_psx_acl:1; /* set if posix acl support should be disabled */
+ bool cifs_acl:1;
+ bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
+ bool server_ino:1; /* use inode numbers from server ie UniqueId */
+ bool direct_io:1;
+ bool strict_io:1; /* strict cache behavior */
+ bool remap:1; /* set to remap seven reserved chars in filenames */
+ bool posix_paths:1; /* unset to not ask for posix pathnames. */
+ bool no_linux_ext:1;
+ bool sfu_emul:1;
+ bool nullauth:1; /* attempt to authenticate with null user */
+ bool nocase:1; /* request case insensitive filenames */
+ bool nobrl:1; /* disable sending byte range locks to srv */
+ bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
+ bool seal:1; /* request transport encryption on share */
+ bool nodfs:1; /* Do not request DFS, even if available */
+ bool local_lease:1; /* check leases only on local system, not remote */
+ bool noblocksnd:1;
+ bool noautotune:1;
+ bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
+ bool fsc:1; /* enable fscache */
+ bool mfsymlinks:1; /* use Minshall+French Symlinks */
+ bool multiuser:1;
+ bool use_smb2:1; /* force smb2 use on mount instead of cifs */
+ unsigned int rsize;
+ unsigned int wsize;
+ bool sockopt_tcp_nodelay:1;
+ unsigned short int port;
+ unsigned long actimeo; /* attribute cache timeout (jiffies) */
+ char *prepath;
+ struct sockaddr_storage srcaddr; /* allow binding to a local IP */
+ struct nls_table *local_nls;
+};
+
struct TCP_Server_Info {
struct list_head tcp_ses_list;
struct list_head smb_ses_list;
@@ -549,6 +605,26 @@ static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
return '\\';
}
+static inline void
+convert_delimiter(char *path, char delim)
+{
+ int i;
+ char old_delim;
+
+ if (path == NULL)
+ return;
+
+ if (delim == '/')
+ old_delim = '\\';
+ else
+ old_delim = '/';
+
+ for (i = 0; path[i] != '\0'; i++) {
+ if (path[i] == old_delim)
+ path[i] = delim;
+ }
+}
+
#ifdef CONFIG_CIFS_STATS
#define cifs_stats_inc atomic_inc
@@ -54,8 +54,9 @@ do { \
__func__, curr_xid, (int)rc); \
} while (0)
extern char *build_path_from_dentry(struct dentry *);
-extern char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb,
- struct cifs_tcon *tcon);
+extern char *cifs_build_path_to_root(struct smb_vol *vol,
+ struct cifs_sb_info *cifs_sb,
+ struct cifs_tcon *tcon);
extern char *build_wildcard_path_from_dentry(struct dentry *direntry);
extern char *cifs_compose_mount_options(const char *sb_mountdata,
const char *fullpath, const struct dfs_info3_param *ref,
@@ -60,62 +60,6 @@
extern mempool_t *cifs_req_poolp;
-struct smb_vol {
- char *username;
- char *password;
- char *domainname;
- char *UNC;
- char *UNCip;
- char *iocharset; /* local code page for mapping to and from Unicode */
- char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
- char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
- uid_t cred_uid;
- uid_t linux_uid;
- gid_t linux_gid;
- mode_t file_mode;
- mode_t dir_mode;
- unsigned secFlg;
- bool retry:1;
- bool intr:1;
- bool setuids:1;
- bool override_uid:1;
- bool override_gid:1;
- bool dynperm:1;
- bool noperm:1;
- bool no_psx_acl:1; /* set if posix acl support should be disabled */
- bool cifs_acl:1;
- bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
- bool server_ino:1; /* use inode numbers from server ie UniqueId */
- bool direct_io:1;
- bool strict_io:1; /* strict cache behavior */
- bool remap:1; /* set to remap seven reserved chars in filenames */
- bool posix_paths:1; /* unset to not ask for posix pathnames. */
- bool no_linux_ext:1;
- bool sfu_emul:1;
- bool nullauth:1; /* attempt to authenticate with null user */
- bool nocase:1; /* request case insensitive filenames */
- bool nobrl:1; /* disable sending byte range locks to srv */
- bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
- bool seal:1; /* request transport encryption on share */
- bool nodfs:1; /* Do not request DFS, even if available */
- bool local_lease:1; /* check leases only on local system, not remote */
- bool noblocksnd:1;
- bool noautotune:1;
- bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
- bool fsc:1; /* enable fscache */
- bool mfsymlinks:1; /* use Minshall+French Symlinks */
- bool multiuser:1;
- bool use_smb2:1; /* force smb2 use on mount instead of cifs */
- unsigned int rsize;
- unsigned int wsize;
- bool sockopt_tcp_nodelay:1;
- unsigned short int port;
- unsigned long actimeo; /* attribute cache timeout (jiffies) */
- char *prepath;
- struct sockaddr_storage srcaddr; /* allow binding to a local IP */
- struct nls_table *local_nls;
-};
-
/* FIXME: should these be tunable? */
#define TLINK_ERROR_EXPIRE (1 * HZ)
#define TLINK_IDLE_EXPIRE (600 * HZ)
@@ -2560,12 +2504,6 @@ void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon,
CIFS_MOUNT_POSIX_PATHS;
}
- /* We might be setting the path sep back to a different
- form if we are reconnecting and the server switched its
- posix path capability for this share */
- if (sb && (CIFS_SB(sb)->prepathlen > 0))
- CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
-
if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
CIFS_SB(sb)->rsize = 127 * 1024;
@@ -2606,26 +2544,6 @@ void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon,
}
}
-static void
-convert_delimiter(char *path, char delim)
-{
- int i;
- char old_delim;
-
- if (path == NULL)
- return;
-
- if (delim == '/')
- old_delim = '\\';
- else
- old_delim = '/';
-
- for (i = 0; path[i] != '\0'; i++) {
- if (path[i] == old_delim)
- path[i] = delim;
- }
-}
-
void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
struct cifs_sb_info *cifs_sb)
{
@@ -2663,18 +2581,6 @@ void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
/* Windows ME may prefer this */
cFYI(1, "readsize set to minimum: 2048");
}
- /* calculate prepath */
- cifs_sb->prepath = pvolume_info->prepath;
- if (cifs_sb->prepath) {
- cifs_sb->prepathlen = strlen(cifs_sb->prepath);
- /* we can not convert the / to \ in the path
- separators in the prefixpath yet because we do not
- know (until reset_cifs_unix_caps is called later)
- whether POSIX PATH CAP is available. We normalize
- the / to \ after reset_cifs_unix_caps is called */
- pvolume_info->prepath = NULL;
- } else
- cifs_sb->prepathlen = 0;
cifs_sb->mnt_uid = pvolume_info->linux_uid;
cifs_sb->mnt_gid = pvolume_info->linux_gid;
cifs_sb->mnt_file_mode = pvolume_info->file_mode;
@@ -2786,24 +2692,13 @@ build_unc_path_to_root(const struct smb_vol *volume_info,
char *full_path;
int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
- full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
+ full_path = kmalloc(unc_len + 1, GFP_KERNEL);
if (full_path == NULL)
return ERR_PTR(-ENOMEM);
strncpy(full_path, volume_info->UNC, unc_len);
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
- int i;
- for (i = 0; i < unc_len; i++) {
- if (full_path[i] == '\\')
- full_path[i] = '/';
- }
- }
-
- if (cifs_sb->prepathlen)
- strncpy(full_path + unc_len, cifs_sb->prepath,
- cifs_sb->prepathlen);
-
- full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
+ full_path[unc_len] = 0; /* add trailing null */
+ convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
return full_path;
}
@@ -2995,10 +2890,6 @@ try_mount_again:
else
tcon->unix_ext = 0; /* server does not support them */
- /* convert forward to back slashes in prepath here if needed */
- if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
- convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
-
if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
cifs_sb->rsize = 1024 * 127;
cFYI(DBG2, "no very large read support, rsize now 127K");
@@ -3029,10 +2920,10 @@ remote_path_check:
}
#endif
- /* check if a whole path (including prepath) is not remote */
+ /* check if a whole path is not remote */
if (!rc && tcon) {
/* build_path_to_root works only when we have a valid tcon */
- full_path = cifs_build_path_to_root(cifs_sb, tcon);
+ full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
if (full_path == NULL) {
rc = -ENOMEM;
goto mount_fail_check;
@@ -3058,10 +2949,6 @@ remote_path_check:
rc = -ELOOP;
goto mount_fail_check;
}
- /* convert forward to back slashes in prepath here if needed */
- if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
- convert_delimiter(cifs_sb->prepath,
- CIFS_DIR_SEP(cifs_sb));
rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb,
true);
@@ -3287,7 +3174,6 @@ cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
struct rb_root *root = &cifs_sb->tlink_tree;
struct rb_node *node;
struct tcon_link *tlink;
- char *tmp;
cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
@@ -3304,11 +3190,6 @@ cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
}
spin_unlock(&cifs_sb->tlink_tree_lock);
- tmp = cifs_sb->prepath;
- cifs_sb->prepathlen = 0;
- cifs_sb->prepath = NULL;
- kfree(tmp);
-
return 0;
}
@@ -50,7 +50,6 @@ build_path_from_dentry(struct dentry *direntry)
{
struct dentry *temp;
int namelen;
- int pplen;
int dfsplen;
char *full_path;
char dirsep;
@@ -63,13 +62,12 @@ build_path_from_dentry(struct dentry *direntry)
when the server crashed */
dirsep = CIFS_DIR_SEP(cifs_sb);
- pplen = cifs_sb->prepathlen;
if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
else
dfsplen = 0;
cifs_bp_rename_retry:
- namelen = pplen + dfsplen;
+ namelen = dfsplen;
for (temp = direntry; !IS_ROOT(temp);) {
namelen += (1 + temp->d_name.len);
temp = temp->d_parent;
@@ -100,7 +98,7 @@ cifs_bp_rename_retry:
return NULL;
}
}
- if (namelen != pplen + dfsplen) {
+ if (namelen != dfsplen) {
cERROR(1, "did not end path lookup where expected namelen is %d",
namelen);
/* presumably this is only possible if racing with a rename
@@ -126,7 +124,6 @@ cifs_bp_rename_retry:
}
}
}
- strncpy(full_path + dfsplen, CIFS_SB(direntry->d_sb)->prepath, pplen);
return full_path;
}
@@ -735,10 +735,10 @@ static const struct inode_operations cifs_ipc_inode_ops = {
.lookup = cifs_lookup,
};
-char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb,
- struct cifs_tcon *tcon)
+char *cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
+ struct cifs_tcon *tcon)
{
- int pplen = cifs_sb->prepathlen;
+ int pplen = vol->prepath ? strlen(vol->prepath) : 0;
int dfsplen;
char *full_path = NULL;
@@ -772,7 +772,7 @@ char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb,
}
}
}
- strncpy(full_path + dfsplen, cifs_sb->prepath, pplen);
+ strncpy(full_path + dfsplen, vol->prepath, pplen);
full_path[dfsplen + pplen] = 0; /* add trailing null */
return full_path;
}
@@ -887,16 +887,17 @@ struct inode *cifs_root_iget(struct super_block *sb)
char *full_path;
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
- full_path = cifs_build_path_to_root(cifs_sb, tcon);
+ full_path = kmalloc(1, GFP_KERNEL);
if (full_path == NULL)
return ERR_PTR(-ENOMEM);
+ full_path[0] = 0;
xid = GetXid();
if (tcon->unix_ext)
rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
else
- rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
- xid, NULL);
+ rc = cifs_get_inode_info(&inode, full_path, NULL, sb, xid,
+ NULL);
if (!inode) {
inode = ERR_PTR(rc);
Now we point superblock to a server share root and set a root dentry appropriately. This let us share superblock between mounts like //server/sharename/foo/bar and //server/sharename/foo further. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> --- fs/cifs/cifs_fs_sb.h | 2 - fs/cifs/cifsfs.c | 95 +++++++++++++++++++++++++++++++++++- fs/cifs/cifsglob.h | 76 +++++++++++++++++++++++++++++ fs/cifs/cifsproto.h | 5 +- fs/cifs/connect.c | 129 ++------------------------------------------------ fs/cifs/dir.c | 7 +-- fs/cifs/inode.c | 15 +++--- 7 files changed, 186 insertions(+), 143 deletions(-)