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cifs: Handle extended attribute name cifs_acl to generate cifs acl blob (try #4)

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Add extended attribute name system.cifs_acl

Get/generate cifs/ntfs acl blob and hand over to the invoker however
it wants to parse/process it under experimental configurable option CIFS_ACL.

Do not get CIFS/NTFS ACL for xattr for attribute system.posix_acl_access

Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Shirish Pargaonkar 2010-11-27 11:37:54 -06:00 committed by Steve French
parent 78415d2d30
commit fbeba8bb16
4 changed files with 40 additions and 26 deletions
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7
fs/cifs/Kconfig
View File

@ -144,6 +144,13 @@ config CIFS_FSCACHE
to be cached locally on disk through the general filesystem cache
manager. If unsure, say N.
config CIFS_ACL
bool "Provide CIFS ACL support (EXPERIMENTAL)"
depends on EXPERIMENTAL && CIFS_XATTR
help
Allows to fetch CIFS/NTFS ACL from the server. The DACL blob
is handed over to the application/caller.
config CIFS_EXPERIMENTAL
bool "CIFS Experimental Features (EXPERIMENTAL)"
depends on CIFS && EXPERIMENTAL

2
fs/cifs/cifsacl.c
View File

@ -608,7 +608,7 @@ static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb,
}
/* Retrieve an ACL from the server */
static struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb,
struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb,
struct inode *inode, const char *path,
u32 *pacllen)
{

2
fs/cifs/cifsproto.h
View File

@ -134,6 +134,8 @@ extern int cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb,
struct cifs_fattr *fattr, struct inode *inode,
const char *path, const __u16 *pfid);
extern int mode_to_cifs_acl(struct inode *inode, const char *path, __u64);
extern struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *, struct inode *,
const char *, u32 *);
extern int cifs_mount(struct super_block *, struct cifs_sb_info *, char *,
const char *);

55
fs/cifs/xattr.c
View File

@ -30,10 +30,11 @@
#define MAX_EA_VALUE_SIZE 65535
#define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
#define CIFS_XATTR_USER_PREFIX "user."
#define CIFS_XATTR_SYSTEM_PREFIX "system."
#define CIFS_XATTR_OS2_PREFIX "os2."
#define CIFS_XATTR_SECURITY_PREFIX ".security"
#define CIFS_XATTR_SECURITY_PREFIX "security."
#define CIFS_XATTR_TRUSTED_PREFIX "trusted."
#define XATTR_TRUSTED_PREFIX_LEN 8
#define XATTR_SECURITY_PREFIX_LEN 9
@ -277,29 +278,8 @@ ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
#ifdef CONFIG_CIFS_EXPERIMENTAL
else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
__u16 fid;
int oplock = 0;
struct cifs_ntsd *pacl = NULL;
__u32 buflen = 0;
if (experimEnabled)
rc = CIFSSMBOpen(xid, pTcon, full_path,
FILE_OPEN, GENERIC_READ, 0, &fid,
&oplock, NULL, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
/* else rc is EOPNOTSUPP from above */
if (rc == 0) {
rc = CIFSSMBGetCIFSACL(xid, pTcon, fid, &pacl,
&buflen);
CIFSSMBClose(xid, pTcon, fid);
}
}
#endif /* EXPERIMENTAL */
#else
cFYI(1, "query POSIX ACL not supported yet");
cFYI(1, "Query POSIX ACL not supported yet");
#endif /* CONFIG_CIFS_POSIX */
} else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
@ -311,8 +291,33 @@ ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
#else
cFYI(1, "query POSIX default ACL not supported yet");
#endif
cFYI(1, "Query POSIX default ACL not supported yet");
#endif /* CONFIG_CIFS_POSIX */
} else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
#ifdef CONFIG_CIFS_ACL
u32 acllen;
struct cifs_ntsd *pacl;
pacl = get_cifs_acl(cifs_sb, direntry->d_inode,
full_path, &acllen);
if (IS_ERR(pacl)) {
rc = PTR_ERR(pacl);
cERROR(1, "%s: error %zd getting sec desc",
__func__, rc);
} else {
if (ea_value) {
if (acllen > buf_size)
acllen = -ERANGE;
else
memcpy(ea_value, pacl, acllen);
}
rc = acllen;
kfree(pacl);
}
#else
cFYI(1, "Query CIFS ACL not supported yet");
#endif /* CONFIG_CIFS_ACL */
} else if (strncmp(ea_name,
CIFS_XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
cFYI(1, "Trusted xattr namespace not supported yet");