cifs: Include backup intent search flags during searches {try #2)

commit 2608bee744a92d60d15ff4e6e0b913d8b406aedd upstream.

As observed and suggested by Tushar Gosavi...

---------
readdir calls these function to send TRANS2_FIND_FIRST and
TRANS2_FIND_NEXT command to the server. The current cifs module is
not specifying CIFS_SEARCH_BACKUP_SEARCH flag while sending these
command when backupuid/backupgid is specified. This can be resolved
by specifying CIFS_SEARCH_BACKUP_SEARCH flag.
---------

Reported-and-Tested-by: Tushar Gosavi <tugosavi@in.ibm.com>
Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 6f4e243..26917d3 100644 (file)
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -184,11 +184,13 @@ extern int CIFSTCon(unsigned int xid, struct cifs_ses *ses,
 
 extern int CIFSFindFirst(const int xid, struct cifs_tcon *tcon,
                const char *searchName, const struct nls_table *nls_codepage,
-               __u16 *searchHandle, struct cifs_search_info *psrch_inf,
+               __u16 *searchHandle, __u16 search_flags,
+               struct cifs_search_info *psrch_inf,
                int map, const char dirsep);
 
 extern int CIFSFindNext(const int xid, struct cifs_tcon *tcon,
-               __u16 searchHandle, struct cifs_search_info *psrch_inf);
+               __u16 searchHandle, __u16 search_flags,
+               struct cifs_search_info *psrch_inf);
 
 extern int CIFSFindClose(const int, struct cifs_tcon *tcon,
                        const __u16 search_handle);

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index e89803b..6aa7457 100644 (file)
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -4327,7 +4327,7 @@ int
 CIFSFindFirst(const int xid, struct cifs_tcon *tcon,
              const char *searchName,
              const struct nls_table *nls_codepage,
-             __u16 *pnetfid,
+             __u16 *pnetfid, __u16 search_flags,
              struct cifs_search_info *psrch_inf, int remap, const char dirsep)
 {
 /* level 257 SMB_ */
@@ -4399,8 +4399,7 @@ findFirstRetry:
            cpu_to_le16(ATTR_READONLY | ATTR_HIDDEN | ATTR_SYSTEM |
                        ATTR_DIRECTORY);
        pSMB->SearchCount = cpu_to_le16(CIFSMaxBufSize/sizeof(FILE_UNIX_INFO));
-       pSMB->SearchFlags = cpu_to_le16(CIFS_SEARCH_CLOSE_AT_END |
-               CIFS_SEARCH_RETURN_RESUME);
+       pSMB->SearchFlags = cpu_to_le16(search_flags);
        pSMB->InformationLevel = cpu_to_le16(psrch_inf->info_level);
 
        /* BB what should we set StorageType to? Does it matter? BB */
@@ -4470,8 +4469,8 @@ findFirstRetry:
        return rc;
 }
 
-int CIFSFindNext(const int xid, struct cifs_tcon *tcon,
-                __u16 searchHandle, struct cifs_search_info *psrch_inf)
+int CIFSFindNext(const int xid, struct cifs_tcon *tcon, __u16 searchHandle,
+                __u16 search_flags, struct cifs_search_info *psrch_inf)
 {
        TRANSACTION2_FNEXT_REQ *pSMB = NULL;
        TRANSACTION2_FNEXT_RSP *pSMBr = NULL;
@@ -4514,8 +4513,7 @@ int CIFSFindNext(const int xid, struct cifs_tcon *tcon,
                cpu_to_le16(CIFSMaxBufSize / sizeof(FILE_UNIX_INFO));
        pSMB->InformationLevel = cpu_to_le16(psrch_inf->info_level);
        pSMB->ResumeKey = psrch_inf->resume_key;
-       pSMB->SearchFlags =
-             cpu_to_le16(CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME);
+       pSMB->SearchFlags = cpu_to_le16(search_flags);
 
        name_len = psrch_inf->resume_name_len;
        params += name_len;

diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index a090bbe..db4a138 100644 (file)
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -219,6 +219,7 @@ int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
 
 static int initiate_cifs_search(const int xid, struct file *file)
 {
+       __u16 search_flags;
        int rc = 0;
        char *full_path = NULL;
        struct cifsFileInfo *cifsFile;
@@ -270,8 +271,12 @@ ffirst_retry:
                cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
        }
 
+       search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
+       if (backup_cred(cifs_sb))
+               search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
+
        rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
-               &cifsFile->netfid, &cifsFile->srch_inf,
+               &cifsFile->netfid, search_flags, &cifsFile->srch_inf,
                cifs_sb->mnt_cifs_flags &
                        CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
        if (rc == 0)
@@ -502,11 +507,13 @@ static int cifs_save_resume_key(const char *current_entry,
 static int find_cifs_entry(const int xid, struct cifs_tcon *pTcon,
        struct file *file, char **ppCurrentEntry, int *num_to_ret)
 {
+       __u16 search_flags;
        int rc = 0;
        int pos_in_buf = 0;
        loff_t first_entry_in_buffer;
        loff_t index_to_find = file->f_pos;
        struct cifsFileInfo *cifsFile = file->private_data;
+       struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
        /* check if index in the buffer */
 
        if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
@@ -560,10 +567,14 @@ static int find_cifs_entry(const int xid, struct cifs_tcon *pTcon,
                                                cifsFile);
        }
 
+       search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
+       if (backup_cred(cifs_sb))
+               search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
+
        while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
              (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
                cFYI(1, "calling findnext2");
-               rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
+               rc = CIFSFindNext(xid, pTcon, cifsFile->netfid, search_flags,
                                  &cifsFile->srch_inf);
                /* FindFirst/Next set last_entry to NULL on malformed reply */
                if (cifsFile->srch_inf.last_entry)