From: Christoph Hellwig Date: Thu, 30 Jan 2014 07:59:19 +0000 (-0800) Subject: hfsplus: use xattr handlers for removexattr X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b168fff72109a3627686578e31e745f778832f98;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git hfsplus: use xattr handlers for removexattr hfsplus was already using the handlers for get and set operations, and with the removal of can_set_xattr we've now allow operations that wouldn't otherwise be allowed. With this we can also centralize the special-casing of the osx. attrs that don't have prefixes on disk in the osx xattr handlers. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c index 9ee62985e739..bdec66522de3 100644 --- a/fs/hfsplus/dir.c +++ b/fs/hfsplus/dir.c @@ -529,7 +529,7 @@ const struct inode_operations hfsplus_dir_inode_operations = { .setxattr = generic_setxattr, .getxattr = generic_getxattr, .listxattr = hfsplus_listxattr, - .removexattr = hfsplus_removexattr, + .removexattr = generic_removexattr, #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL .get_acl = hfsplus_get_posix_acl, .set_acl = hfsplus_set_posix_acl, diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c index 4551cbd6bd43..fa929f325f87 100644 --- a/fs/hfsplus/inode.c +++ b/fs/hfsplus/inode.c @@ -331,7 +331,7 @@ static const struct inode_operations hfsplus_file_inode_operations = { .setxattr = generic_setxattr, .getxattr = generic_getxattr, .listxattr = hfsplus_listxattr, - .removexattr = hfsplus_removexattr, + .removexattr = generic_removexattr, #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL .get_acl = hfsplus_get_posix_acl, .set_acl = hfsplus_set_posix_acl, diff --git a/fs/hfsplus/xattr.c b/fs/hfsplus/xattr.c index 0b4a5c9b93c4..4e27edc082a4 100644 --- a/fs/hfsplus/xattr.c +++ b/fs/hfsplus/xattr.c @@ -11,6 +11,8 @@ #include "xattr.h" #include "acl.h" +static int hfsplus_removexattr(struct inode *inode, const char *name); + const struct xattr_handler *hfsplus_xattr_handlers[] = { &hfsplus_xattr_osx_handler, &hfsplus_xattr_user_handler, @@ -274,14 +276,8 @@ int __hfsplus_setxattr(struct inode *inode, const char *name, HFSPLUS_IS_RSRC(inode)) return -EOPNOTSUPP; - if (strncmp(name, XATTR_MAC_OSX_PREFIX, - XATTR_MAC_OSX_PREFIX_LEN) == 0) - name += XATTR_MAC_OSX_PREFIX_LEN; - - if (value == NULL) { - value = ""; - size = 0; - } + if (value == NULL) + return hfsplus_removexattr(inode, name); err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd); if (err) { @@ -399,16 +395,11 @@ end_setxattr: return err; } -static inline int is_osx_xattr(const char *xattr_name) -{ - return !is_known_namespace(xattr_name); -} - static int name_len(const char *xattr_name, int xattr_name_len) { int len = xattr_name_len + 1; - if (is_osx_xattr(xattr_name)) + if (!is_known_namespace(xattr_name)) len += XATTR_MAC_OSX_PREFIX_LEN; return len; @@ -419,7 +410,7 @@ static int copy_name(char *buffer, const char *xattr_name, int name_len) int len = name_len; int offset = 0; - if (is_osx_xattr(xattr_name)) { + if (!is_known_namespace(xattr_name)) { strncpy(buffer, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN); offset += XATTR_MAC_OSX_PREFIX_LEN; len += XATTR_MAC_OSX_PREFIX_LEN; @@ -497,18 +488,6 @@ ssize_t __hfsplus_getxattr(struct inode *inode, const char *name, HFSPLUS_IS_RSRC(inode)) return -EOPNOTSUPP; - if (strncmp(name, XATTR_MAC_OSX_PREFIX, - XATTR_MAC_OSX_PREFIX_LEN) == 0) { - /* skip "osx." prefix */ - name += XATTR_MAC_OSX_PREFIX_LEN; - /* - * Don't allow retrieving properly prefixed attributes - * by prepending them with "osx." - */ - if (is_known_namespace(name)) - return -EOPNOTSUPP; - } - if (!strcmp_xattr_finder_info(name)) return hfsplus_getxattr_finder_info(inode, value, size); @@ -743,28 +722,18 @@ end_listxattr: return res; } -int hfsplus_removexattr(struct dentry *dentry, const char *name) +static int hfsplus_removexattr(struct inode *inode, const char *name) { int err = 0; - struct inode *inode = dentry->d_inode; struct hfs_find_data cat_fd; u16 flags; u16 cat_entry_type; int is_xattr_acl_deleted = 0; int is_all_xattrs_deleted = 0; - if ((!S_ISREG(inode->i_mode) && - !S_ISDIR(inode->i_mode)) || - HFSPLUS_IS_RSRC(inode)) - return -EOPNOTSUPP; - if (!HFSPLUS_SB(inode->i_sb)->attr_tree) return -EOPNOTSUPP; - if (strncmp(name, XATTR_MAC_OSX_PREFIX, - XATTR_MAC_OSX_PREFIX_LEN) == 0) - name += XATTR_MAC_OSX_PREFIX_LEN; - if (!strcmp_xattr_finder_info(name)) return -EOPNOTSUPP; @@ -838,8 +807,12 @@ static int hfsplus_osx_getxattr(struct dentry *dentry, const char *name, if (len > HFSPLUS_ATTR_MAX_STRLEN) return -EOPNOTSUPP; - strcpy(xattr_name, XATTR_MAC_OSX_PREFIX); - strcpy(xattr_name + XATTR_MAC_OSX_PREFIX_LEN, name); + /* + * Don't allow retrieving properly prefixed attributes + * by prepending them with "osx." + */ + if (is_known_namespace(name)) + return -EOPNOTSUPP; return hfsplus_getxattr(dentry, xattr_name, buffer, size); } @@ -857,12 +830,13 @@ static int hfsplus_osx_setxattr(struct dentry *dentry, const char *name, if (len > HFSPLUS_ATTR_MAX_STRLEN) return -EOPNOTSUPP; + /* + * Don't allow setting properly prefixed attributes + * by prepending them with "osx." + */ if (is_known_namespace(name)) return -EOPNOTSUPP; - strcpy(xattr_name, XATTR_MAC_OSX_PREFIX); - strcpy(xattr_name + XATTR_MAC_OSX_PREFIX_LEN, name); - return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags); } diff --git a/fs/hfsplus/xattr.h b/fs/hfsplus/xattr.h index 9e214490c313..288530cf80b5 100644 --- a/fs/hfsplus/xattr.h +++ b/fs/hfsplus/xattr.h @@ -40,8 +40,6 @@ static inline ssize_t hfsplus_getxattr(struct dentry *dentry, ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size); -int hfsplus_removexattr(struct dentry *dentry, const char *name); - int hfsplus_init_security(struct inode *inode, struct inode *dir, const struct qstr *qstr);