[PATCH] ubifs: Switch to generic xattr handlers
Andreas Gruenbacher
agruenba at redhat.com
Fri Apr 22 10:14:00 PDT 2016
Hello,
could you please review the following change which depends on the work.xattr
branch of vfs.git:
https://git.kernel.org/cgit/linux/kernel/git/viro/vfs.git/log/?h=work.xattr
I will send the change on to Al once it has been reviewed.
Thanks,
Andreas
Signed-off-by: Andreas Gruenbacher <agruenba at redhat.com>
---
fs/ubifs/dir.c | 6 +--
fs/ubifs/file.c | 12 ++---
fs/ubifs/super.c | 1 +
fs/ubifs/ubifs.h | 7 +--
fs/ubifs/xattr.c | 143 ++++++++++++++++++++++++++-----------------------------
5 files changed, 79 insertions(+), 90 deletions(-)
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 795992a..4d07d15 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -1182,10 +1182,10 @@ const struct inode_operations ubifs_dir_inode_operations = {
.rename = ubifs_rename,
.setattr = ubifs_setattr,
.getattr = ubifs_getattr,
- .setxattr = ubifs_setxattr,
- .getxattr = ubifs_getxattr,
+ .setxattr = generic_setxattr,
+ .getxattr = generic_getxattr,
.listxattr = ubifs_listxattr,
- .removexattr = ubifs_removexattr,
+ .removexattr = generic_removexattr,
#ifdef CONFIG_UBIFS_ATIME_SUPPORT
.update_time = ubifs_update_time,
#endif
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 065c88f..e149437 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1597,10 +1597,10 @@ const struct address_space_operations ubifs_file_address_operations = {
const struct inode_operations ubifs_file_inode_operations = {
.setattr = ubifs_setattr,
.getattr = ubifs_getattr,
- .setxattr = ubifs_setxattr,
- .getxattr = ubifs_getxattr,
+ .setxattr = generic_setxattr,
+ .getxattr = generic_getxattr,
.listxattr = ubifs_listxattr,
- .removexattr = ubifs_removexattr,
+ .removexattr = generic_removexattr,
#ifdef CONFIG_UBIFS_ATIME_SUPPORT
.update_time = ubifs_update_time,
#endif
@@ -1611,10 +1611,10 @@ const struct inode_operations ubifs_symlink_inode_operations = {
.get_link = simple_get_link,
.setattr = ubifs_setattr,
.getattr = ubifs_getattr,
- .setxattr = ubifs_setxattr,
- .getxattr = ubifs_getxattr,
+ .setxattr = generic_setxattr,
+ .getxattr = generic_getxattr,
.listxattr = ubifs_listxattr,
- .removexattr = ubifs_removexattr,
+ .removexattr = generic_removexattr,
#ifdef CONFIG_UBIFS_ATIME_SUPPORT
.update_time = ubifs_update_time,
#endif
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index a233ba9..f72f642 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -2040,6 +2040,7 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
if (c->max_inode_sz > MAX_LFS_FILESIZE)
sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
sb->s_op = &ubifs_super_operations;
+ sb->s_xattr = ubifs_xattr_handlers;
mutex_lock(&c->umount_mutex);
err = mount_ubifs(c);
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index 536fb49..05d9fe7 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -37,6 +37,7 @@
#include <linux/pagemap.h>
#include <linux/backing-dev.h>
#include <linux/security.h>
+#include <linux/xattr.h>
#include "ubifs-media.h"
/* Version of this UBIFS implementation */
@@ -1732,12 +1733,8 @@ int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat);
/* xattr.c */
-int ubifs_setxattr(struct dentry *dentry, const char *name,
- const void *value, size_t size, int flags);
-ssize_t ubifs_getxattr(struct dentry *dentry, struct inode *host,
- const char *name, void *buf, size_t size);
+extern const struct xattr_handler *ubifs_xattr_handlers[];
ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size);
-int ubifs_removexattr(struct dentry *dentry, const char *name);
int ubifs_init_security(struct inode *dentry, struct inode *inode,
const struct qstr *qstr);
diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c
index 413d650..6c277eb 100644
--- a/fs/ubifs/xattr.c
+++ b/fs/ubifs/xattr.c
@@ -249,42 +249,6 @@ out_free:
return err;
}
-/**
- * check_namespace - check extended attribute name-space.
- * @nm: extended attribute name
- *
- * This function makes sure the extended attribute name belongs to one of the
- * supported extended attribute name-spaces. Returns name-space index in case
- * of success and a negative error code in case of failure.
- */
-static int check_namespace(const struct qstr *nm)
-{
- int type;
-
- if (nm->len > UBIFS_MAX_NLEN)
- return -ENAMETOOLONG;
-
- if (!strncmp(nm->name, XATTR_TRUSTED_PREFIX,
- XATTR_TRUSTED_PREFIX_LEN)) {
- if (nm->name[XATTR_TRUSTED_PREFIX_LEN] == '\0')
- return -EINVAL;
- type = TRUSTED_XATTR;
- } else if (!strncmp(nm->name, XATTR_USER_PREFIX,
- XATTR_USER_PREFIX_LEN)) {
- if (nm->name[XATTR_USER_PREFIX_LEN] == '\0')
- return -EINVAL;
- type = USER_XATTR;
- } else if (!strncmp(nm->name, XATTR_SECURITY_PREFIX,
- XATTR_SECURITY_PREFIX_LEN)) {
- if (nm->name[XATTR_SECURITY_PREFIX_LEN] == '\0')
- return -EINVAL;
- type = SECURITY_XATTR;
- } else
- return -EOPNOTSUPP;
-
- return type;
-}
-
static struct inode *iget_xattr(struct ubifs_info *c, ino_t inum)
{
struct inode *inode;
@@ -302,24 +266,23 @@ static struct inode *iget_xattr(struct ubifs_info *c, ino_t inum)
return ERR_PTR(-EINVAL);
}
-static int setxattr(struct inode *host, const char *name, const void *value,
- size_t size, int flags)
+static int __ubifs_setxattr(struct inode *host, const char *name,
+ const void *value, size_t size, int flags)
{
struct inode *inode;
struct ubifs_info *c = host->i_sb->s_fs_info;
struct qstr nm = QSTR_INIT(name, strlen(name));
struct ubifs_dent_node *xent;
union ubifs_key key;
- int err, type;
+ int err;
ubifs_assert(inode_is_locked(host));
if (size > UBIFS_MAX_INO_DATA)
return -ERANGE;
- type = check_namespace(&nm);
- if (type < 0)
- return type;
+ if (nm.len > UBIFS_MAX_NLEN)
+ return -ENAMETOOLONG;
xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
if (!xent)
@@ -363,17 +326,8 @@ out_free:
return err;
}
-int ubifs_setxattr(struct dentry *dentry, const char *name,
- const void *value, size_t size, int flags)
-{
- dbg_gen("xattr '%s', host ino %lu ('%pd'), size %zd",
- name, d_inode(dentry)->i_ino, dentry, size);
-
- return setxattr(d_inode(dentry), name, value, size, flags);
-}
-
-ssize_t ubifs_getxattr(struct dentry *dentry, struct inode *host,
- const char *name, void *buf, size_t size)
+static ssize_t __ubifs_getxattr(struct inode *host, const char *name,
+ void *buf, size_t size)
{
struct inode *inode;
struct ubifs_info *c = host->i_sb->s_fs_info;
@@ -383,12 +337,8 @@ ssize_t ubifs_getxattr(struct dentry *dentry, struct inode *host,
union ubifs_key key;
int err;
- dbg_gen("xattr '%s', ino %lu ('%pd'), buf size %zd", name,
- host->i_ino, dentry, size);
-
- err = check_namespace(&nm);
- if (err < 0)
- return err;
+ if (nm.len > UBIFS_MAX_NLEN)
+ return -ENAMETOOLONG;
xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
if (!xent)
@@ -460,8 +410,6 @@ ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size)
lowest_xent_key(c, &key, host->i_ino);
while (1) {
- int type;
-
xent = ubifs_tnc_next_ent(c, &key, &nm);
if (IS_ERR(xent)) {
err = PTR_ERR(xent);
@@ -471,14 +419,10 @@ ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size)
nm.name = xent->name;
nm.len = le16_to_cpu(xent->nlen);
- type = check_namespace(&nm);
- if (unlikely(type < 0)) {
- err = type;
- break;
- }
-
/* Show trusted namespace only for "power" users */
- if (type != TRUSTED_XATTR || capable(CAP_SYS_ADMIN)) {
+ if (strncmp(xent->name, XATTR_TRUSTED_PREFIX,
+ XATTR_TRUSTED_PREFIX_LEN) ||
+ capable(CAP_SYS_ADMIN)) {
memcpy(buffer + written, nm.name, nm.len + 1);
written += nm.len + 1;
}
@@ -538,22 +482,19 @@ out_cancel:
return err;
}
-int ubifs_removexattr(struct dentry *dentry, const char *name)
+static int __ubifs_removexattr(struct inode *host, const char *name)
{
- struct inode *inode, *host = d_inode(dentry);
+ struct inode *inode;
struct ubifs_info *c = host->i_sb->s_fs_info;
struct qstr nm = QSTR_INIT(name, strlen(name));
struct ubifs_dent_node *xent;
union ubifs_key key;
int err;
- dbg_gen("xattr '%s', ino %lu ('%pd')", name,
- host->i_ino, dentry);
ubifs_assert(inode_is_locked(host));
- err = check_namespace(&nm);
- if (err < 0)
- return err;
+ if (nm.len > UBIFS_MAX_NLEN)
+ return -ENAMETOOLONG;
xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
if (!xent)
@@ -603,7 +544,7 @@ static int init_xattrs(struct inode *inode, const struct xattr *xattr_array,
}
strcpy(name, XATTR_SECURITY_PREFIX);
strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
- err = setxattr(inode, name, xattr->value, xattr->value_len, 0);
+ err = __ubifs_setxattr(inode, name, xattr->value, xattr->value_len, 0);
kfree(name);
if (err < 0)
break;
@@ -626,3 +567,53 @@ int ubifs_init_security(struct inode *dentry, struct inode *inode,
}
return err;
}
+
+static int ubifs_xattr_get(const struct xattr_handler *handler,
+ struct dentry *dentry, struct inode *inode,
+ const char *name, void *buffer, size_t size)
+{
+ dbg_gen("xattr '%s', ino %lu ('%pd'), buf size %zd", name,
+ inode->i_ino, dentry, size);
+
+ return __ubifs_getxattr(inode, name, buffer, size);
+}
+
+static int ubifs_xattr_set(const struct xattr_handler *handler,
+ struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags)
+{
+ struct inode *inode = d_inode(dentry);
+
+ dbg_gen("xattr '%s', host ino %lu ('%pd'), size %zd",
+ name, inode->i_ino, dentry, size);
+
+ if (value)
+ return __ubifs_setxattr(inode, name, value, size, flags);
+ else
+ return __ubifs_removexattr(inode, name);
+}
+
+const struct xattr_handler ubifs_user_xattr_handler = {
+ .prefix = XATTR_USER_PREFIX,
+ .get = ubifs_xattr_get,
+ .set = ubifs_xattr_set,
+};
+
+const struct xattr_handler ubifs_trusted_xattr_handler = {
+ .prefix = XATTR_TRUSTED_PREFIX,
+ .get = ubifs_xattr_get,
+ .set = ubifs_xattr_set,
+};
+
+const struct xattr_handler ubifs_security_xattr_handler = {
+ .prefix = XATTR_SECURITY_PREFIX,
+ .get = ubifs_xattr_get,
+ .set = ubifs_xattr_set,
+};
+
+const struct xattr_handler *ubifs_xattr_handlers[] = {
+ &ubifs_user_xattr_handler,
+ &ubifs_trusted_xattr_handler,
+ &ubifs_security_xattr_handler,
+ NULL
+};
--
2.5.5
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