]> git.karo-electronics.de Git - mv-sheeva.git/blobdiff - fs/cifs/dir.c
cifs: have find_readable/writable_file filter by fsuid
[mv-sheeva.git] / fs / cifs / dir.c
index f9ed0751cc12cb6f93e498b526c07e215bb91138..e249b561ce8f861d92e1f6dd46b244c50e709b51 100644 (file)
@@ -54,18 +54,18 @@ build_path_from_dentry(struct dentry *direntry)
        int dfsplen;
        char *full_path;
        char dirsep;
-       struct cifs_sb_info *cifs_sb;
+       struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
+       struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 
        if (direntry == NULL)
                return NULL;  /* not much we can do if dentry is freed and
                we need to reopen the file after it was closed implicitly
                when the server crashed */
 
-       cifs_sb = CIFS_SB(direntry->d_sb);
        dirsep = CIFS_DIR_SEP(cifs_sb);
        pplen = cifs_sb->prepathlen;
-       if (cifs_sb->tcon && (cifs_sb->tcon->Flags & SMB_SHARE_IS_IN_DFS))
-               dfsplen = strnlen(cifs_sb->tcon->treeName, MAX_TREE_SIZE + 1);
+       if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
+               dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
        else
                dfsplen = 0;
 cifs_bp_rename_retry:
@@ -117,7 +117,7 @@ cifs_bp_rename_retry:
        /* BB test paths to Windows with '/' in the midst of prepath */
 
        if (dfsplen) {
-               strncpy(full_path, cifs_sb->tcon->treeName, dfsplen);
+               strncpy(full_path, tcon->treeName, dfsplen);
                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
                        int i;
                        for (i = 0; i < dfsplen; i++) {
@@ -131,28 +131,26 @@ cifs_bp_rename_retry:
 }
 
 struct cifsFileInfo *
-cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle,
-                 struct file *file, struct vfsmount *mnt, unsigned int oflags)
+cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle, struct file *file,
+                 struct vfsmount *mnt, struct tcon_link *tlink,
+                 unsigned int oflags, __u32 oplock)
 {
-       int oplock = 0;
        struct cifsFileInfo *pCifsFile;
        struct cifsInodeInfo *pCifsInode;
-       struct cifs_sb_info *cifs_sb = CIFS_SB(mnt->mnt_sb);
 
        pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
        if (pCifsFile == NULL)
                return pCifsFile;
 
-       if (oplockEnabled)
-               oplock = REQ_OPLOCK;
-
        pCifsFile->netfid = fileHandle;
        pCifsFile->pid = current->tgid;
+       pCifsFile->uid = current_fsuid();
        pCifsFile->pInode = igrab(newinode);
        pCifsFile->mnt = mnt;
        pCifsFile->pfile = file;
        pCifsFile->invalidHandle = false;
        pCifsFile->closePend = false;
+       pCifsFile->tlink = cifs_get_tlink(tlink);
        mutex_init(&pCifsFile->fh_mutex);
        mutex_init(&pCifsFile->lock_mutex);
        INIT_LIST_HEAD(&pCifsFile->llist);
@@ -160,7 +158,7 @@ cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle,
        INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break);
 
        write_lock(&GlobalSMBSeslock);
-       list_add(&pCifsFile->tlist, &cifs_sb->tcon->openFileList);
+       list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList));
        pCifsInode = CIFS_I(newinode);
        if (pCifsInode) {
                /* if readable file instance put first in list*/
@@ -193,6 +191,8 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
        __u32 posix_flags = 0;
        struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
        struct cifs_fattr fattr;
+       struct tcon_link *tlink;
+       struct cifsTconInfo *tcon;
 
        cFYI(1, "posix open %s", full_path);
 
@@ -227,10 +227,20 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
                posix_flags |= SMB_O_DIRECT;
 
        mode &= ~current_umask();
-       rc = CIFSPOSIXCreate(xid, cifs_sb->tcon, posix_flags, mode,
-                       pnetfid, presp_data, poplock, full_path,
-                       cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
+
+       tlink = cifs_sb_tlink(cifs_sb);
+       if (IS_ERR(tlink)) {
+               rc = PTR_ERR(tlink);
+               goto posix_open_ret;
+       }
+
+       tcon = tlink_tcon(tlink);
+       rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
+                            poplock, full_path, cifs_sb->local_nls,
+                            cifs_sb->mnt_cifs_flags &
                                        CIFS_MOUNT_MAP_SPECIAL_CHR);
+       cifs_put_tlink(tlink);
+
        if (rc)
                goto posix_open_ret;
 
@@ -291,6 +301,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
        int desiredAccess = GENERIC_READ | GENERIC_WRITE;
        __u16 fileHandle;
        struct cifs_sb_info *cifs_sb;
+       struct tcon_link *tlink;
        struct cifsTconInfo *tcon;
        char *full_path = NULL;
        FILE_ALL_INFO *buf = NULL;
@@ -300,13 +311,12 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
        xid = GetXid();
 
        cifs_sb = CIFS_SB(inode->i_sb);
-       tcon = cifs_sb->tcon;
-
-       full_path = build_path_from_dentry(direntry);
-       if (full_path == NULL) {
-               rc = -ENOMEM;
-               goto cifs_create_out;
+       tlink = cifs_sb_tlink(cifs_sb);
+       if (IS_ERR(tlink)) {
+               FreeXid(xid);
+               return PTR_ERR(tlink);
        }
+       tcon = tlink_tcon(tlink);
 
        if (oplockEnabled)
                oplock = REQ_OPLOCK;
@@ -316,6 +326,12 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
        else
                oflags = FMODE_READ | SMB_O_CREAT;
 
+       full_path = build_path_from_dentry(direntry);
+       if (full_path == NULL) {
+               rc = -ENOMEM;
+               goto cifs_create_out;
+       }
+
        if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
            (CIFS_UNIX_POSIX_PATH_OPS_CAP &
                        le64_to_cpu(tcon->fsUnixInfo.Capability))) {
@@ -375,7 +391,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
        if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
                create_options |= CREATE_OPTION_READONLY;
 
-       if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
+       if (tcon->ses->capabilities & CAP_NT_SMBS)
                rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
                         desiredAccess, create_options,
                         &fileHandle, &oplock, buf, cifs_sb->local_nls,
@@ -468,7 +484,8 @@ cifs_create_set_dentry:
                }
 
                pfile_info = cifs_new_fileinfo(newinode, fileHandle, filp,
-                                              nd->path.mnt, oflags);
+                                               nd->path.mnt, tlink, oflags,
+                                               oplock);
                if (pfile_info == NULL) {
                        fput(filp);
                        CIFSSMBClose(xid, tcon, fileHandle);
@@ -481,6 +498,7 @@ cifs_create_set_dentry:
 cifs_create_out:
        kfree(buf);
        kfree(full_path);
+       cifs_put_tlink(tlink);
        FreeXid(xid);
        return rc;
 }
@@ -491,6 +509,7 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
        int rc = -EPERM;
        int xid;
        struct cifs_sb_info *cifs_sb;
+       struct tcon_link *tlink;
        struct cifsTconInfo *pTcon;
        char *full_path = NULL;
        struct inode *newinode = NULL;
@@ -503,10 +522,14 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
        if (!old_valid_dev(device_number))
                return -EINVAL;
 
-       xid = GetXid();
-
        cifs_sb = CIFS_SB(inode->i_sb);
-       pTcon = cifs_sb->tcon;
+       tlink = cifs_sb_tlink(cifs_sb);
+       if (IS_ERR(tlink))
+               return PTR_ERR(tlink);
+
+       pTcon = tlink_tcon(tlink);
+
+       xid = GetXid();
 
        full_path = build_path_from_dentry(direntry);
        if (full_path == NULL) {
@@ -606,6 +629,7 @@ mknod_out:
        kfree(full_path);
        kfree(buf);
        FreeXid(xid);
+       cifs_put_tlink(tlink);
        return rc;
 }
 
@@ -619,6 +643,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
        __u16 fileHandle = 0;
        bool posix_open = false;
        struct cifs_sb_info *cifs_sb;
+       struct tcon_link *tlink;
        struct cifsTconInfo *pTcon;
        struct cifsFileInfo *cfile;
        struct inode *newInode = NULL;
@@ -633,7 +658,12 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
        /* check whether path exists */
 
        cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
-       pTcon = cifs_sb->tcon;
+       tlink = cifs_sb_tlink(cifs_sb);
+       if (IS_ERR(tlink)) {
+               FreeXid(xid);
+               return (struct dentry *)tlink;
+       }
+       pTcon = tlink_tcon(tlink);
 
        /*
         * Don't allow the separator character in a path component.
@@ -644,8 +674,8 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
                for (i = 0; i < direntry->d_name.len; i++)
                        if (direntry->d_name.name[i] == '\\') {
                                cFYI(1, "Invalid file name");
-                               FreeXid(xid);
-                               return ERR_PTR(-EINVAL);
+                               rc = -EINVAL;
+                               goto lookup_out;
                        }
        }
 
@@ -655,7 +685,8 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
         */
        if (nd && (nd->flags & LOOKUP_EXCL)) {
                d_instantiate(direntry, NULL);
-               return NULL;
+               rc = 0;
+               goto lookup_out;
        }
 
        /* can not grab the rename sem here since it would
@@ -663,8 +694,8 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
        in which we already have the sb rename sem */
        full_path = build_path_from_dentry(direntry);
        if (full_path == NULL) {
-               FreeXid(xid);
-               return ERR_PTR(-ENOMEM);
+               rc = -ENOMEM;
+               goto lookup_out;
        }
 
        if (direntry->d_inode != NULL) {
@@ -728,8 +759,9 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
                        }
 
                        cfile = cifs_new_fileinfo(newInode, fileHandle, filp,
-                                                 nd->path.mnt,
-                                                 nd->intent.open.flags);
+                                                 nd->path.mnt, tlink,
+                                                 nd->intent.open.flags,
+                                                 oplock);
                        if (cfile == NULL) {
                                fput(filp);
                                CIFSSMBClose(xid, pTcon, fileHandle);
@@ -759,6 +791,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 
 lookup_out:
        kfree(full_path);
+       cifs_put_tlink(tlink);
        FreeXid(xid);
        return ERR_PTR(rc);
 }