[CIFS] DFS patch that connects inode with dfs handling ops
if DFS junction point
Signed-off-by: Igor Mammedov <niallain@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 24eb4d3..4f0ee67 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -30,7 +30,7 @@
#include "cifs_fs_sb.h"
-static void cifs_set_ops(struct inode *inode)
+static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
@@ -57,8 +57,12 @@
inode->i_data.a_ops = &cifs_addr_ops;
break;
case S_IFDIR:
- inode->i_op = &cifs_dir_inode_ops;
- inode->i_fop = &cifs_dir_ops;
+ if (is_dfs_referral) {
+ inode->i_op = &cifs_dfs_referral_inode_operations;
+ } else {
+ inode->i_op = &cifs_dir_inode_ops;
+ inode->i_fop = &cifs_dir_ops;
+ }
break;
case S_IFLNK:
inode->i_op = &cifs_symlink_inode_ops;
@@ -153,6 +157,30 @@
spin_unlock(&inode->i_lock);
}
+static const unsigned char *cifs_get_search_path(struct cifsTconInfo *pTcon,
+ const char *search_path)
+{
+ int tree_len;
+ int path_len;
+ char *tmp_path;
+
+ if (!(pTcon->Flags & SMB_SHARE_IS_IN_DFS))
+ return search_path;
+
+ /* use full path name for working with DFS */
+ tree_len = strnlen(pTcon->treeName, MAX_TREE_SIZE + 1);
+ path_len = strnlen(search_path, MAX_PATHCONF);
+
+ tmp_path = kmalloc(tree_len+path_len+1, GFP_KERNEL);
+ if (tmp_path == NULL)
+ return search_path;
+
+ strncpy(tmp_path, pTcon->treeName, tree_len);
+ strncpy(tmp_path+tree_len, search_path, path_len);
+ tmp_path[tree_len+path_len] = 0;
+ return tmp_path;
+}
+
int cifs_get_inode_info_unix(struct inode **pinode,
const unsigned char *search_path, struct super_block *sb, int xid)
{
@@ -161,41 +189,28 @@
struct cifsTconInfo *pTcon;
struct inode *inode;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
- char *tmp_path;
+ const unsigned char *full_path;
+ bool is_dfs_referral = false;
pTcon = cifs_sb->tcon;
cFYI(1, ("Getting info on %s", search_path));
+
+ full_path = cifs_get_search_path(pTcon, search_path);
+
+try_again_CIFSSMBUnixQPathInfo:
/* could have done a find first instead but this returns more info */
- rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData,
+ rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &findData,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
/* dump_mem("\nUnixQPathInfo return data", &findData,
sizeof(findData)); */
if (rc) {
- if (rc == -EREMOTE) {
- tmp_path =
- kmalloc(strnlen(pTcon->treeName,
- MAX_TREE_SIZE + 1) +
- strnlen(search_path, MAX_PATHCONF) + 1,
- GFP_KERNEL);
- if (tmp_path == NULL)
- return -ENOMEM;
-
- /* have to skip first of the double backslash of
- UNC name */
- strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
- strncat(tmp_path, search_path, MAX_PATHCONF);
- rc = connect_to_dfs_path(xid, pTcon->ses,
- /* treename + */ tmp_path,
- cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
- kfree(tmp_path);
-
- /* BB fix up inode etc. */
- } else if (rc) {
- return rc;
+ if (rc == -EREMOTE && !is_dfs_referral) {
+ is_dfs_referral = true;
+ full_path = search_path;
+ goto try_again_CIFSSMBUnixQPathInfo;
}
+ goto cgiiu_exit;
} else {
struct cifsInodeInfo *cifsInfo;
__u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
@@ -204,8 +219,10 @@
/* get new inode */
if (*pinode == NULL) {
*pinode = new_inode(sb);
- if (*pinode == NULL)
- return -ENOMEM;
+ if (*pinode == NULL) {
+ rc = -ENOMEM;
+ goto cgiiu_exit;
+ }
/* Is an i_ino of zero legal? */
/* Are there sanity checks we can use to ensure that
the server is really filling in that field? */
@@ -237,8 +254,11 @@
(unsigned long) inode->i_size,
(unsigned long long)inode->i_blocks));
- cifs_set_ops(inode);
+ cifs_set_ops(inode, is_dfs_referral);
}
+cgiiu_exit:
+ if (full_path != search_path)
+ kfree(full_path);
return rc;
}
@@ -353,9 +373,10 @@
struct cifsTconInfo *pTcon;
struct inode *inode;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
- char *tmp_path;
+ const unsigned char *full_path = NULL;
char *buf = NULL;
int adjustTZ = FALSE;
+ bool is_dfs_referral = false;
pTcon = cifs_sb->tcon;
cFYI(1, ("Getting info on %s", search_path));
@@ -373,8 +394,12 @@
if (buf == NULL)
return -ENOMEM;
pfindData = (FILE_ALL_INFO *)buf;
+
+ full_path = cifs_get_search_path(pTcon, search_path);
+
+try_again_CIFSSMBQPathInfo:
/* could do find first instead but this returns more info */
- rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
+ rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
0 /* not legacy */,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
@@ -382,7 +407,7 @@
when server claims no NT SMB support and the above call
failed at least once - set flag in tcon or mount */
if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
- rc = SMBQueryInformation(xid, pTcon, search_path,
+ rc = SMBQueryInformation(xid, pTcon, full_path,
pfindData, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
@@ -391,31 +416,12 @@
}
/* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
if (rc) {
- if (rc == -EREMOTE) {
- tmp_path =
- kmalloc(strnlen
- (pTcon->treeName,
- MAX_TREE_SIZE + 1) +
- strnlen(search_path, MAX_PATHCONF) + 1,
- GFP_KERNEL);
- if (tmp_path == NULL) {
- kfree(buf);
- return -ENOMEM;
- }
-
- strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
- strncat(tmp_path, search_path, MAX_PATHCONF);
- rc = connect_to_dfs_path(xid, pTcon->ses,
- /* treename + */ tmp_path,
- cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
- kfree(tmp_path);
- /* BB fix up inode etc. */
- } else if (rc) {
- kfree(buf);
- return rc;
+ if (rc == -EREMOTE && !is_dfs_referral) {
+ is_dfs_referral = true;
+ full_path = search_path;
+ goto try_again_CIFSSMBQPathInfo;
}
+ goto cgii_exit;
} else {
struct cifsInodeInfo *cifsInfo;
__u32 attr = le32_to_cpu(pfindData->Attributes);
@@ -424,8 +430,8 @@
if (*pinode == NULL) {
*pinode = new_inode(sb);
if (*pinode == NULL) {
- kfree(buf);
- return -ENOMEM;
+ rc = -ENOMEM;
+ goto cgii_exit;
}
/* Is an i_ino of zero legal? Can we use that to check
if the server supports returning inode numbers? Are
@@ -573,8 +579,11 @@
atomic_set(&cifsInfo->inUse, 1);
}
- cifs_set_ops(inode);
+ cifs_set_ops(inode, is_dfs_referral);
}
+cgii_exit:
+ if (full_path != search_path)
+ kfree(full_path);
kfree(buf);
return rc;
}
@@ -804,7 +813,7 @@
local_size = tmp_inode->i_size;
cifs_unix_info_to_inode(tmp_inode, pData, 1);
- cifs_set_ops(tmp_inode);
+ cifs_set_ops(tmp_inode, false);
if (!S_ISREG(tmp_inode->i_mode))
return;