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[PATCH] reiserfs: use generic_permission

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Use the generic_permission code with a proper wrapper and callback instead
of having a local copy.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Chris Mason <mason@suse.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Hellwig 2006-02-01 03:06:46 -08:00 committed by Linus Torvalds
parent c87d0c07ea
commit ec191574b9
1 changed files with 30 additions and 81 deletions
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111
fs/reiserfs/xattr.c
View file

@ -1319,95 +1319,44 @@ int reiserfs_xattr_init(struct super_block *s, int mount_flags)
return err;
}
int reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd)
static int reiserfs_check_acl(struct inode *inode, int mask)
{
umode_t mode = inode->i_mode;
struct posix_acl *acl;
int error = -EAGAIN; /* do regular unix permission checks by default */
if (mask & MAY_WRITE) {
/*
* Nobody gets write access to a read-only fs.
*/
if (IS_RDONLY(inode) &&
(S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
return -EROFS;
reiserfs_read_lock_xattr_i(inode);
reiserfs_read_lock_xattrs(inode->i_sb);
/*
* Nobody gets write access to an immutable file.
*/
if (IS_IMMUTABLE(inode))
return -EACCES;
acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
reiserfs_read_unlock_xattrs(inode->i_sb);
reiserfs_read_unlock_xattr_i(inode);
if (acl) {
if (!IS_ERR(acl)) {
error = posix_acl_permission(inode, acl, mask);
posix_acl_release(acl);
} else if (PTR_ERR(acl) != -ENODATA)
error = PTR_ERR(acl);
}
/* We don't do permission checks on the internal objects.
* Permissions are determined by the "owning" object. */
return error;
}
int reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd)
{
/*
* We don't do permission checks on the internal objects.
* Permissions are determined by the "owning" object.
*/
if (is_reiserfs_priv_object(inode))
return 0;
if (current->fsuid == inode->i_uid) {
mode >>= 6;
#ifdef CONFIG_REISERFS_FS_POSIX_ACL
} else if (reiserfs_posixacl(inode->i_sb) &&
get_inode_sd_version(inode) != STAT_DATA_V1) {
struct posix_acl *acl;
/* ACL can't contain additional permissions if
the ACL_MASK entry is 0 */
if (!(mode & S_IRWXG))
goto check_groups;
reiserfs_read_lock_xattr_i(inode);
reiserfs_read_lock_xattrs(inode->i_sb);
acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
reiserfs_read_unlock_xattrs(inode->i_sb);
reiserfs_read_unlock_xattr_i(inode);
if (IS_ERR(acl)) {
if (PTR_ERR(acl) == -ENODATA)
goto check_groups;
return PTR_ERR(acl);
}
if (acl) {
int err = posix_acl_permission(inode, acl, mask);
posix_acl_release(acl);
if (err == -EACCES) {
goto check_capabilities;
}
return err;
} else {
goto check_groups;
}
#endif
} else {
check_groups:
if (in_group_p(inode->i_gid))
mode >>= 3;
}
/*
* If the DACs are ok we don't need any capability check.
* Stat data v1 doesn't support ACLs.
*/
if (((mode & mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == mask))
return 0;
check_capabilities:
/*
* Read/write DACs are always overridable.
* Executable DACs are overridable if at least one exec bit is set.
*/
if (!(mask & MAY_EXEC) ||
(inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode))
if (capable(CAP_DAC_OVERRIDE))
return 0;
/*
* Searching includes executable on directories, else just read.
*/
if (mask == MAY_READ || (S_ISDIR(inode->i_mode) && !(mask & MAY_WRITE)))
if (capable(CAP_DAC_READ_SEARCH))
return 0;
return -EACCES;
if (get_inode_sd_version(inode) == STAT_DATA_V1)
return generic_permission(inode, mask, NULL);
else
return generic_permission(inode, mask, reiserfs_check_acl);
}