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| author | Shirish Pargaonkar <shirishpargaonkar@gmail.com> | 2011-09-26 09:56:44 -0500 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2011-10-12 23:42:17 -0500 |
| commit | 3d3ea8e64efbeb3e4289675dbbfab82333395642 (patch) | |
| tree | 3f7c52039dceefeae2abf010a1a3ec8abef0c459 /fs/cifs/dir.c | |
| parent | 8bc4392a1e50f346e97f8777aaefd9cfc3d45c9f (diff) | |
| download | lwn-3d3ea8e64efbeb3e4289675dbbfab82333395642.tar.gz lwn-3d3ea8e64efbeb3e4289675dbbfab82333395642.zip | |
cifs: Add mount options for backup intent (try #6)
Add mount options backupuid and backugid.
It allows an authenticated user to access files with the intent to back them
up including their ACLs, who may not have access permission but has
"Backup files and directories user right" on them (by virtue of being part
of the built-in group Backup Operators.
When mount options backupuid is specified, cifs client restricts the
use of backup intents to the user whose effective user id is specified
along with the mount option.
When mount options backupgid is specified, cifs client restricts the
use of backup intents to the users whose effective user id belongs to the
group id specified along with the mount option.
If an authenticated user is not part of the built-in group Backup Operators
at the server, access to such files is denied, even if allowed by the client.
Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs/dir.c')
| -rw-r--r-- | fs/cifs/dir.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c index 4dd5333753fa..0c8098d54d2b 100644 --- a/fs/cifs/dir.c +++ b/fs/cifs/dir.c @@ -244,6 +244,9 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode, if (!tcon->unix_ext && (mode & S_IWUGO) == 0) create_options |= CREATE_OPTION_READONLY; + if (backup_cred(cifs_sb)) + create_options |= CREATE_OPEN_BACKUP_INTENT; + if (tcon->ses->capabilities & CAP_NT_SMBS) rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, create_options, @@ -357,6 +360,7 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, { int rc = -EPERM; int xid; + int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL; struct cifs_sb_info *cifs_sb; struct tcon_link *tlink; struct cifs_tcon *pTcon; @@ -431,9 +435,11 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, return rc; } - /* FIXME: would WRITE_OWNER | WRITE_DAC be better? */ + if (backup_cred(cifs_sb)) + create_options |= CREATE_OPEN_BACKUP_INTENT; + rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE, - GENERIC_WRITE, CREATE_NOT_DIR | CREATE_OPTION_SPECIAL, + GENERIC_WRITE, create_options, &fileHandle, &oplock, buf, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); if (rc) |