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cifs: reorganize get_cifs_acl

Browse source 
Thus spake Christoph:

"But this whole set_cifs_acl function is a real mess anyway and needs
some splitting up."

With this change too, it's possible to call acl_to_uid_mode() with a
NULL inode pointer. That (or something close to it) will eventually be
necessary when cifs_get_inode_info is reorganized.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Shirish Pargaonkar <shirishp@us.ibm.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Christoph Hellwig 2009-05-27 09:37:33 -04:00 committed by Steve French
parent c5077ec423
commit 1bf4072da6
3 changed files with 56 additions and 52 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

102
fs/cifs/cifsacl.c
View file

@ -552,67 +552,66 @@ static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,
return rc;
}
/* Retrieve an ACL from the server */
static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode,
const char *path, const __u16 *pfid)
static struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb,
__u16 fid, u32 *pacllen)
{
struct cifsFileInfo *open_file = NULL;
bool unlock_file = false;
int xid;
int rc = -EIO;
__u16 fid;
struct super_block *sb;
struct cifs_sb_info *cifs_sb;
struct cifs_ntsd *pntsd = NULL;
cFYI(1, ("get mode from ACL for %s", path));
if (inode == NULL)
return NULL;
int xid, rc;
xid = GetXid();
if (pfid == NULL)
open_file = find_readable_file(CIFS_I(inode));
else
fid = *pfid;
rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
FreeXid(xid);
sb = inode->i_sb;
if (sb == NULL) {
FreeXid(xid);
return NULL;
}
cifs_sb = CIFS_SB(sb);
if (open_file) {
unlock_file = true;
fid = open_file->netfid;
} else if (pfid == NULL) {
int oplock = 0;
/* open file */
rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN,
READ_CONTROL, 0, &fid, &oplock, NULL,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc != 0) {
cERROR(1, ("Unable to open file to get ACL"));
FreeXid(xid);
return NULL;
}
cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen));
return pntsd;
}
static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb,
const char *path, u32 *pacllen)
{
struct cifs_ntsd *pntsd = NULL;
int oplock = 0;
int xid, rc;
__u16 fid;
xid = GetXid();
rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, READ_CONTROL, 0,
&fid, &oplock, NULL, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc) {
cERROR(1, ("Unable to open file to get ACL"));
goto out;
}
rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen));
if (unlock_file == true) /* find_readable_file increments ref count */
atomic_dec(&open_file->wrtPending);
else if (pfid == NULL) /* if opened above we have to close the handle */
CIFSSMBClose(xid, cifs_sb->tcon, fid);
/* else handle was passed in by caller */
CIFSSMBClose(xid, cifs_sb->tcon, fid);
out:
FreeXid(xid);
return pntsd;
}
/* Retrieve an ACL from the server */
static struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb,
struct inode *inode, const char *path,
u32 *pacllen)
{
struct cifs_ntsd *pntsd = NULL;
struct cifsFileInfo *open_file = NULL;
if (inode)
open_file = find_readable_file(CIFS_I(inode));
if (!open_file)
return get_cifs_acl_by_path(cifs_sb, path, pacllen);
pntsd = get_cifs_acl_by_fid(cifs_sb, open_file->netfid, pacllen);
atomic_dec(&open_file->wrtPending);
return pntsd;
}
/* Set an ACL on the server */
static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
struct inode *inode, const char *path)
@ -668,14 +667,19 @@ static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
}
/* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */
void acl_to_uid_mode(struct inode *inode, const char *path, const __u16 *pfid)
void acl_to_uid_mode(struct cifs_sb_info *cifs_sb, struct inode *inode,
const char *path, const __u16 *pfid)
{
struct cifs_ntsd *pntsd = NULL;
u32 acllen = 0;
int rc = 0;
cFYI(DBG2, ("converting ACL to mode for %s", path));
pntsd = get_cifs_acl(&acllen, inode, path, pfid);
if (pfid)
pntsd = get_cifs_acl_by_fid(cifs_sb, *pfid, &acllen);
else
pntsd = get_cifs_acl(cifs_sb, inode, path, &acllen);
/* if we can retrieve the ACL, now parse Access Control Entries, ACEs */
if (pntsd)
@ -698,7 +702,7 @@ int mode_to_acl(struct inode *inode, const char *path, __u64 nmode)
cFYI(DBG2, ("set ACL from mode for %s", path));
/* Get the security descriptor */
pntsd = get_cifs_acl(&secdesclen, inode, path, NULL);
pntsd = get_cifs_acl(CIFS_SB(inode->i_sb), inode, path, &secdesclen);
/* Add three ACEs for owner, group, everyone getting rid of
other ACEs as chmod disables ACEs and set the security descriptor */

4
fs/cifs/cifsproto.h
View file

@ -108,8 +108,8 @@ extern int cifs_get_inode_info(struct inode **pinode,
extern int cifs_get_inode_info_unix(struct inode **pinode,
const unsigned char *search_path,
struct super_block *sb, int xid);
extern void acl_to_uid_mode(struct inode *inode, const char *path,
const __u16 *pfid);
extern void acl_to_uid_mode(struct cifs_sb_info *cifs_sb, struct inode *inode,
const char *path, const __u16 *pfid);
extern int mode_to_acl(struct inode *inode, const char *path, __u64);
extern int cifs_mount(struct super_block *, struct cifs_sb_info *, char *,

2
fs/cifs/inode.c
View file

@ -626,7 +626,7 @@ int cifs_get_inode_info(struct inode **pinode,
/* 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);
acl_to_uid_mode(cifs_sb, inode, full_path, pfid);
}
#endif
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {