[CIFS] Enable DFS support for Windows query path info
Final piece for handling DFS in query_path_info, constructing a
fake inode for the junction directory which the submount will cover.
This handles the non-Unix (Windows etc.) code path.
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 422d4e2..1cf43e1 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -161,6 +161,12 @@
spin_unlock(&inode->i_lock);
}
+
+/*
+ * Needed to setup inode data for the directory which is the
+ * junction to the new submount (ie to setup the fake directory
+ * which represents a DFS referral)
+ */
static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
struct super_block *sb)
{
@@ -370,11 +376,42 @@
#endif
}
+/*
+ * Needed to setup inode data for the directory which is the
+ * junction to the new submount (ie to setup the fake directory
+ * which represents a DFS referral)
+ */
+static void fill_fake_finddata(FILE_ALL_INFO *pfnd_dat,
+ struct super_block *sb)
+{
+ memset(pfnd_dat, sizeof(FILE_ALL_INFO), 0);
+
+/* __le64 pfnd_dat->AllocationSize = cpu_to_le64(0);
+ __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
+ __u8 pfnd_dat->DeletePending = 0;
+ __u8 pfnd_data->Directory = 0;
+ __le32 pfnd_dat->EASize = 0;
+ __u64 pfnd_dat->IndexNumber = 0;
+ __u64 pfnd_dat->IndexNumber1 = 0; */
+ pfnd_dat->CreationTime =
+ cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
+ pfnd_dat->LastAccessTime =
+ cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
+ pfnd_dat->LastWriteTime =
+ cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
+ pfnd_dat->ChangeTime =
+ cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
+ pfnd_dat->Attributes = cpu_to_le32(ATTR_DIRECTORY);
+ pfnd_dat->NumberOfLinks = cpu_to_le32(2);
+}
+
int cifs_get_inode_info(struct inode **pinode,
const unsigned char *full_path, FILE_ALL_INFO *pfindData,
struct super_block *sb, int xid, const __u16 *pfid)
{
int rc = 0;
+ __u32 attr;
+ struct cifsInodeInfo *cifsInfo;
struct cifsTconInfo *pTcon;
struct inode *inode;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
@@ -399,7 +436,6 @@
return -ENOMEM;
pfindData = (FILE_ALL_INFO *)buf;
-try_again_CIFSSMBQPathInfo:
/* could do find first instead but this returns more info */
rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
0 /* not legacy */,
@@ -417,171 +453,167 @@
}
}
/* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
- if (rc) {
- if (rc == -EREMOTE && !is_dfs_referral) {
- is_dfs_referral = true;
- goto try_again_CIFSSMBQPathInfo;
- }
+ if (rc == -EREMOTE) {
+ is_dfs_referral = true;
+ fill_fake_finddata(pfindData, sb);
+ rc = 0;
+ } else if (rc)
goto cgii_exit;
- } else {
- struct cifsInodeInfo *cifsInfo;
- __u32 attr = le32_to_cpu(pfindData->Attributes);
- /* get new inode */
+ attr = le32_to_cpu(pfindData->Attributes);
+
+ /* get new inode */
+ if (*pinode == NULL) {
+ *pinode = new_inode(sb);
if (*pinode == NULL) {
- *pinode = new_inode(sb);
- if (*pinode == NULL) {
- 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
- there other sanity checks we can use to ensure that
- the server is really filling in that field? */
+ 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
+ there other sanity checks we can use to ensure that
+ the server is really filling in that field? */
- /* We can not use the IndexNumber field by default from
- Windows or Samba (in ALL_INFO buf) but we can request
- it explicitly. It may not be unique presumably if
- the server has multiple devices mounted under one
- share */
+ /* We can not use the IndexNumber field by default from
+ Windows or Samba (in ALL_INFO buf) but we can request
+ it explicitly. It may not be unique presumably if
+ the server has multiple devices mounted under one share */
- /* There may be higher info levels that work but are
- there Windows server or network appliances for which
- IndexNumber field is not guaranteed unique? */
+ /* There may be higher info levels that work but are
+ there Windows server or network appliances for which
+ IndexNumber field is not guaranteed unique? */
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
- int rc1 = 0;
- __u64 inode_num;
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
+ int rc1 = 0;
+ __u64 inode_num;
- rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
+ rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
full_path, &inode_num,
cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
- if (rc1) {
- cFYI(1, ("GetSrvInodeNum rc %d", rc1));
- /* BB EOPNOSUPP disable SERVER_INUM? */
- } else /* do we need cast or hash to ino? */
- (*pinode)->i_ino = inode_num;
- } /* else ino incremented to unique num in new_inode*/
- if (sb->s_flags & MS_NOATIME)
- (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
- insert_inode_hash(*pinode);
- }
- inode = *pinode;
- cifsInfo = CIFS_I(inode);
- cifsInfo->cifsAttrs = attr;
- cFYI(1, ("Old time %ld", cifsInfo->time));
- cifsInfo->time = jiffies;
- cFYI(1, ("New time %ld", cifsInfo->time));
-
- /* blksize needs to be multiple of two. So safer to default to
- blksize and blkbits set in superblock so 2**blkbits and blksize
- will match rather than setting to:
- (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
-
- /* Linux can not store file creation time so ignore it */
- if (pfindData->LastAccessTime)
- inode->i_atime = cifs_NTtimeToUnix
- (le64_to_cpu(pfindData->LastAccessTime));
- else /* do not need to use current_fs_time - time not stored */
- inode->i_atime = CURRENT_TIME;
- inode->i_mtime =
- cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
- inode->i_ctime =
- cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
- cFYI(0, ("Attributes came in as 0x%x", attr));
- if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
- inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
- inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
- }
-
- /* set default mode. will override for dirs below */
- if (atomic_read(&cifsInfo->inUse) == 0)
- /* new inode, can safely set these fields */
- inode->i_mode = cifs_sb->mnt_file_mode;
- else /* since we set the inode type below we need to mask off
- to avoid strange results if type changes and both
- get orred in */
- inode->i_mode &= ~S_IFMT;
-/* if (attr & ATTR_REPARSE) */
- /* We no longer handle these as symlinks because we could not
- follow them due to the absolute path with drive letter */
- if (attr & ATTR_DIRECTORY) {
- /* override default perms since we do not do byte range locking
- on dirs */
- inode->i_mode = cifs_sb->mnt_dir_mode;
- inode->i_mode |= S_IFDIR;
- } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
- (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
- /* No need to le64 convert size of zero */
- (pfindData->EndOfFile == 0)) {
- inode->i_mode = cifs_sb->mnt_file_mode;
- inode->i_mode |= S_IFIFO;
-/* BB Finish for SFU style symlinks and devices */
- } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
- (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
- if (decode_sfu_inode(inode,
- le64_to_cpu(pfindData->EndOfFile),
- full_path,
- cifs_sb, xid))
- cFYI(1, ("Unrecognized sfu inode type"));
-
- cFYI(1, ("sfu mode 0%o", inode->i_mode));
- } else {
- inode->i_mode |= S_IFREG;
- /* treat the dos attribute of read-only as read-only
- mode e.g. 555 */
- if (cifsInfo->cifsAttrs & ATTR_READONLY)
- inode->i_mode &= ~(S_IWUGO);
- else if ((inode->i_mode & S_IWUGO) == 0)
- /* the ATTR_READONLY flag may have been */
- /* changed on server -- set any w bits */
- /* allowed by mnt_file_mode */
- inode->i_mode |= (S_IWUGO &
- cifs_sb->mnt_file_mode);
- /* BB add code here -
- validate if device or weird share or device type? */
- }
-
- spin_lock(&inode->i_lock);
- if (is_size_safe_to_change(cifsInfo,
- le64_to_cpu(pfindData->EndOfFile))) {
- /* can not safely shrink the file size here if the
- client is writing to it due to potential races */
- i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
-
- /* 512 bytes (2**9) is the fake blocksize that must be
- used for this calculation */
- inode->i_blocks = (512 - 1 + le64_to_cpu(
- pfindData->AllocationSize)) >> 9;
- }
- spin_unlock(&inode->i_lock);
-
- inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
-
- /* BB fill in uid and gid here? with help from winbind?
- or retrieve from NTFS stream extended attribute */
-#ifdef CONFIG_CIFS_EXPERIMENTAL
- /* fill in 0777 bits from ACL */
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
- cFYI(1, ("Getting mode bits from ACL"));
- acl_to_uid_mode(inode, full_path, pfid);
- }
-#endif
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
- /* fill in remaining high mode bits e.g. SUID, VTX */
- get_sfu_mode(inode, full_path, cifs_sb, xid);
- } else if (atomic_read(&cifsInfo->inUse) == 0) {
- inode->i_uid = cifs_sb->mnt_uid;
- inode->i_gid = cifs_sb->mnt_gid;
- /* set so we do not keep refreshing these fields with
- bad data after user has changed them in memory */
- atomic_set(&cifsInfo->inUse, 1);
- }
-
- cifs_set_ops(inode, is_dfs_referral);
+ if (rc1) {
+ cFYI(1, ("GetSrvInodeNum rc %d", rc1));
+ /* BB EOPNOSUPP disable SERVER_INUM? */
+ } else /* do we need cast or hash to ino? */
+ (*pinode)->i_ino = inode_num;
+ } /* else ino incremented to unique num in new_inode*/
+ if (sb->s_flags & MS_NOATIME)
+ (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
+ insert_inode_hash(*pinode);
}
+ inode = *pinode;
+ cifsInfo = CIFS_I(inode);
+ cifsInfo->cifsAttrs = attr;
+ cFYI(1, ("Old time %ld", cifsInfo->time));
+ cifsInfo->time = jiffies;
+ cFYI(1, ("New time %ld", cifsInfo->time));
+
+ /* blksize needs to be multiple of two. So safer to default to
+ blksize and blkbits set in superblock so 2**blkbits and blksize
+ will match rather than setting to:
+ (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
+
+ /* Linux can not store file creation time so ignore it */
+ if (pfindData->LastAccessTime)
+ inode->i_atime = cifs_NTtimeToUnix
+ (le64_to_cpu(pfindData->LastAccessTime));
+ else /* do not need to use current_fs_time - time not stored */
+ inode->i_atime = CURRENT_TIME;
+ inode->i_mtime =
+ cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
+ inode->i_ctime =
+ cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
+ cFYI(DBG2, ("Attributes came in as 0x%x", attr));
+ if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
+ inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
+ inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
+ }
+
+ /* set default mode. will override for dirs below */
+ if (atomic_read(&cifsInfo->inUse) == 0)
+ /* new inode, can safely set these fields */
+ inode->i_mode = cifs_sb->mnt_file_mode;
+ else /* since we set the inode type below we need to mask off
+ to avoid strange results if type changes and both
+ get orred in */
+ inode->i_mode &= ~S_IFMT;
+/* if (attr & ATTR_REPARSE) */
+ /* We no longer handle these as symlinks because we could not
+ follow them due to the absolute path with drive letter */
+ if (attr & ATTR_DIRECTORY) {
+ /* override default perms since we do not do byte range locking
+ on dirs */
+ inode->i_mode = cifs_sb->mnt_dir_mode;
+ inode->i_mode |= S_IFDIR;
+ } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
+ (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
+ /* No need to le64 convert size of zero */
+ (pfindData->EndOfFile == 0)) {
+ inode->i_mode = cifs_sb->mnt_file_mode;
+ inode->i_mode |= S_IFIFO;
+/* BB Finish for SFU style symlinks and devices */
+ } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
+ (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
+ if (decode_sfu_inode(inode, le64_to_cpu(pfindData->EndOfFile),
+ full_path, cifs_sb, xid))
+ cFYI(1, ("Unrecognized sfu inode type"));
+
+ cFYI(1, ("sfu mode 0%o", inode->i_mode));
+ } else {
+ inode->i_mode |= S_IFREG;
+ /* treat dos attribute of read-only as read-only mode eg 555 */
+ if (cifsInfo->cifsAttrs & ATTR_READONLY)
+ inode->i_mode &= ~(S_IWUGO);
+ else if ((inode->i_mode & S_IWUGO) == 0)
+ /* the ATTR_READONLY flag may have been */
+ /* changed on server -- set any w bits */
+ /* allowed by mnt_file_mode */
+ inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
+ /* BB add code to validate if device or weird share or device type? */
+ }
+
+ spin_lock(&inode->i_lock);
+ if (is_size_safe_to_change(cifsInfo,
+ le64_to_cpu(pfindData->EndOfFile))) {
+ /* can not safely shrink the file size here if the
+ client is writing to it due to potential races */
+ i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
+
+ /* 512 bytes (2**9) is the fake blocksize that must be
+ used for this calculation */
+ inode->i_blocks = (512 - 1 + le64_to_cpu(
+ pfindData->AllocationSize)) >> 9;
+ }
+ spin_unlock(&inode->i_lock);
+
+ inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
+
+ /* BB fill in uid and gid here? with help from winbind?
+ or retrieve from NTFS stream extended attribute */
+#ifdef CONFIG_CIFS_EXPERIMENTAL
+ /* fill in 0777 bits from ACL */
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
+ cFYI(1, ("Getting mode bits from ACL"));
+ acl_to_uid_mode(inode, full_path, pfid);
+ }
+#endif
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
+ /* fill in remaining high mode bits e.g. SUID, VTX */
+ get_sfu_mode(inode, full_path, cifs_sb, xid);
+ } else if (atomic_read(&cifsInfo->inUse) == 0) {
+ inode->i_uid = cifs_sb->mnt_uid;
+ inode->i_gid = cifs_sb->mnt_gid;
+ /* set so we do not keep refreshing these fields with
+ bad data after user has changed them in memory */
+ atomic_set(&cifsInfo->inUse, 1);
+ }
+
+ cifs_set_ops(inode, is_dfs_referral);
+
+
+
+
cgii_exit:
kfree(buf);
return rc;