mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
staging: erofs: introduce xattr & acl support
This implements xattr and acl functionalities. Inline and shared xattrs are introduced for flexibility. Specifically, if the same xattr occurs for many times in a large number of inodes or the value of a xattr is so large that it isn't suitable to be inlined, a shared xattr kept in the xattr meta will be used instead. Signed-off-by: Miao Xie <miaoxie@huawei.com> Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
fd68c6a20f
commit
b17500a0fd
8 changed files with 835 additions and 1 deletions
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@ -26,6 +26,43 @@ config EROFS_FS_DEBUG
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For daily use, say N.
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config EROFS_FS_XATTR
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bool "EROFS extended attributes"
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depends on EROFS_FS
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default y
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help
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Extended attributes are name:value pairs associated with inodes by
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the kernel or by users (see the attr(5) manual page, or visit
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<http://acl.bestbits.at/> for details).
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If unsure, say N.
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config EROFS_FS_POSIX_ACL
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bool "EROFS Access Control Lists"
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depends on EROFS_FS_XATTR
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select FS_POSIX_ACL
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default y
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help
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Posix Access Control Lists (ACLs) support permissions for users and
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groups beyond the owner/group/world scheme.
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To learn more about Access Control Lists, visit the POSIX ACLs for
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Linux website <http://acl.bestbits.at/>.
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If you don't know what Access Control Lists are, say N.
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config EROFS_FS_SECURITY
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bool "EROFS Security Labels"
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depends on EROFS_FS_XATTR
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help
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Security labels provide an access control facility to support Linux
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Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
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Linux. This option enables an extended attribute handler for file
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security labels in the erofs filesystem, so that it requires enabling
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the extended attribute support in advance.
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If you are not using a security module, say N.
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config EROFS_FS_USE_VM_MAP_RAM
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bool "EROFS VM_MAP_RAM Support"
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depends on EROFS_FS
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@ -8,4 +8,5 @@ obj-$(CONFIG_EROFS_FS) += erofs.o
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# staging requirement: to be self-contained in its own directory
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ccflags-y += -I$(src)/include
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erofs-objs := super.o inode.o data.o namei.o dir.o
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erofs-$(CONFIG_EROFS_FS_XATTR) += xattr.o
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@ -10,7 +10,7 @@
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* License. See the file COPYING in the main directory of the Linux
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* distribution for more details.
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*/
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#include "internal.h"
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#include "xattr.h"
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/* no locking */
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static int read_inode(struct inode *inode, void *data)
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@ -152,15 +152,26 @@ static int fill_inode(struct inode *inode, int isdir)
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if (!err) {
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/* setup the new inode */
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if (S_ISREG(inode->i_mode)) {
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#ifdef CONFIG_EROFS_FS_XATTR
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if (vi->xattr_isize)
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inode->i_op = &erofs_generic_xattr_iops;
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#endif
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inode->i_fop = &generic_ro_fops;
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} else if (S_ISDIR(inode->i_mode)) {
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inode->i_op =
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#ifdef CONFIG_EROFS_FS_XATTR
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vi->xattr_isize ? &erofs_dir_xattr_iops :
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#endif
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&erofs_dir_iops;
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inode->i_fop = &erofs_dir_fops;
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} else if (S_ISLNK(inode->i_mode)) {
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/* by default, page_get_link is used for symlink */
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inode->i_op =
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#ifdef CONFIG_EROFS_FS_XATTR
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&erofs_symlink_xattr_iops,
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#else
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&page_symlink_inode_operations;
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#endif
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inode_nohighmem(inode);
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} else {
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err = -EIO;
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@ -208,3 +219,23 @@ struct inode *erofs_iget(struct super_block *sb,
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return inode;
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}
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#ifdef CONFIG_EROFS_FS_XATTR
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const struct inode_operations erofs_generic_xattr_iops = {
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.listxattr = erofs_listxattr,
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};
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#endif
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#ifdef CONFIG_EROFS_FS_XATTR
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const struct inode_operations erofs_symlink_xattr_iops = {
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.get_link = page_get_link,
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.listxattr = erofs_listxattr,
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};
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#endif
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#ifdef CONFIG_EROFS_FS_XATTR
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const struct inode_operations erofs_fast_symlink_xattr_iops = {
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.get_link = simple_get_link,
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.listxattr = erofs_listxattr,
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};
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#endif
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@ -50,6 +50,9 @@ typedef u64 erofs_nid_t;
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struct erofs_sb_info {
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u32 blocks;
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u32 meta_blkaddr;
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#ifdef CONFIG_EROFS_FS_XATTR
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u32 xattr_blkaddr;
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#endif
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/* inode slot unit size in bit shift */
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unsigned char islotbits;
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@ -72,6 +75,10 @@ struct erofs_sb_info {
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#define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
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#define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info)
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/* Mount flags set via mount options or defaults */
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#define EROFS_MOUNT_XATTR_USER 0x00000010
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#define EROFS_MOUNT_POSIX_ACL 0x00000020
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#define clear_opt(sbi, option) ((sbi)->mount_opt &= ~EROFS_MOUNT_##option)
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#define set_opt(sbi, option) ((sbi)->mount_opt |= EROFS_MOUNT_##option)
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#define test_opt(sbi, option) ((sbi)->mount_opt & EROFS_MOUNT_##option)
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@ -237,17 +244,32 @@ int erofs_namei(struct inode *dir, struct qstr *name,
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erofs_nid_t *nid, unsigned *d_type);
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/* xattr.c */
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#ifdef CONFIG_EROFS_FS_XATTR
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extern const struct xattr_handler *erofs_xattr_handlers[];
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#endif
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/* symlink */
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#ifdef CONFIG_EROFS_FS_XATTR
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extern const struct inode_operations erofs_symlink_xattr_iops;
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extern const struct inode_operations erofs_fast_symlink_xattr_iops;
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#endif
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static inline void set_inode_fast_symlink(struct inode *inode)
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{
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#ifdef CONFIG_EROFS_FS_XATTR
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inode->i_op = &erofs_fast_symlink_xattr_iops;
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#else
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inode->i_op = &simple_symlink_inode_operations;
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#endif
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}
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static inline bool is_inode_fast_symlink(struct inode *inode)
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{
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#ifdef CONFIG_EROFS_FS_XATTR
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return inode->i_op == &erofs_fast_symlink_xattr_iops;
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#else
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return inode->i_op == &simple_symlink_inode_operations;
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#endif
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}
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static inline void *erofs_vmap(struct page **pages, unsigned int count)
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@ -11,6 +11,7 @@
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* distribution for more details.
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*/
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#include "internal.h"
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#include "xattr.h"
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/* based on the value of qn->len is accurate */
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static inline int dirnamecmp(struct qstr *qn,
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@ -239,5 +240,8 @@ const struct inode_operations erofs_dir_iops = {
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const struct inode_operations erofs_dir_xattr_iops = {
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.lookup = erofs_lookup,
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#ifdef CONFIG_EROFS_FS_XATTR
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.listxattr = erofs_listxattr,
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#endif
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};
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@ -14,6 +14,7 @@
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#include <linux/buffer_head.h>
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#include <linux/statfs.h>
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#include <linux/parser.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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static struct kmem_cache *erofs_inode_cachep __read_mostly;
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@ -107,6 +108,9 @@ static int superblock_read(struct super_block *sb)
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sbi->blocks = le32_to_cpu(layout->blocks);
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sbi->meta_blkaddr = le32_to_cpu(layout->meta_blkaddr);
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#ifdef CONFIG_EROFS_FS_XATTR
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sbi->xattr_blkaddr = le32_to_cpu(layout->xattr_blkaddr);
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#endif
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sbi->islotbits = ffs(sizeof(struct erofs_inode_v1)) - 1;
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sbi->root_nid = le16_to_cpu(layout->root_nid);
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@ -127,13 +131,28 @@ static int superblock_read(struct super_block *sb)
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static void default_options(struct erofs_sb_info *sbi)
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{
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#ifdef CONFIG_EROFS_FS_XATTR
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set_opt(sbi, XATTR_USER);
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#endif
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#ifdef CONFIG_EROFS_FS_POSIX_ACL
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set_opt(sbi, POSIX_ACL);
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#endif
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}
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enum {
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Opt_user_xattr,
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Opt_nouser_xattr,
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Opt_acl,
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Opt_noacl,
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Opt_err
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};
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static match_table_t erofs_tokens = {
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{Opt_user_xattr, "user_xattr"},
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{Opt_nouser_xattr, "nouser_xattr"},
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{Opt_acl, "acl"},
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{Opt_noacl, "noacl"},
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{Opt_err, NULL}
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};
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@ -155,6 +174,36 @@ static int parse_options(struct super_block *sb, char *options)
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token = match_token(p, erofs_tokens, args);
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switch (token) {
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#ifdef CONFIG_EROFS_FS_XATTR
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case Opt_user_xattr:
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set_opt(EROFS_SB(sb), XATTR_USER);
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break;
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case Opt_nouser_xattr:
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clear_opt(EROFS_SB(sb), XATTR_USER);
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break;
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#else
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case Opt_user_xattr:
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infoln("user_xattr options not supported");
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break;
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case Opt_nouser_xattr:
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infoln("nouser_xattr options not supported");
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break;
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#endif
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#ifdef CONFIG_EROFS_FS_POSIX_ACL
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case Opt_acl:
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set_opt(EROFS_SB(sb), POSIX_ACL);
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break;
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case Opt_noacl:
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clear_opt(EROFS_SB(sb), POSIX_ACL);
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break;
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#else
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case Opt_acl:
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infoln("acl options not supported");
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break;
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case Opt_noacl:
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infoln("noacl options not supported");
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break;
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#endif
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default:
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errln("Unrecognized mount option \"%s\" "
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"or missing value", p);
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sb->s_op = &erofs_sops;
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#ifdef CONFIG_EROFS_FS_XATTR
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sb->s_xattr = erofs_xattr_handlers;
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#endif
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/* set erofs default mount options */
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default_options(sbi);
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@ -386,6 +439,20 @@ static int erofs_statfs(struct dentry *dentry, struct kstatfs *buf)
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static int erofs_show_options(struct seq_file *seq, struct dentry *root)
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{
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struct erofs_sb_info *sbi __maybe_unused = EROFS_SB(root->d_sb);
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#ifdef CONFIG_EROFS_FS_XATTR
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if (test_opt(sbi, XATTR_USER))
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seq_puts(seq, ",user_xattr");
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else
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seq_puts(seq, ",nouser_xattr");
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#endif
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#ifdef CONFIG_EROFS_FS_POSIX_ACL
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if (test_opt(sbi, POSIX_ACL))
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seq_puts(seq, ",acl");
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else
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seq_puts(seq, ",noacl");
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#endif
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return 0;
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}
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579
drivers/staging/erofs/xattr.c
Normal file
579
drivers/staging/erofs/xattr.c
Normal file
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@ -0,0 +1,579 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/drivers/staging/erofs/xattr.c
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*
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* Copyright (C) 2017-2018 HUAWEI, Inc.
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* http://www.huawei.com/
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* Created by Gao Xiang <gaoxiang25@huawei.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of the Linux
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* distribution for more details.
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*/
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#include <linux/security.h>
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#include "xattr.h"
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struct xattr_iter {
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struct super_block *sb;
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struct page *page;
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void *kaddr;
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erofs_blk_t blkaddr;
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unsigned ofs;
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};
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static inline void xattr_iter_end(struct xattr_iter *it, bool atomic)
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{
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/* only init_inode_xattrs use non-atomic once */
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if (unlikely(!atomic))
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kunmap(it->page);
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else
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kunmap_atomic(it->kaddr);
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unlock_page(it->page);
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put_page(it->page);
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}
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static void init_inode_xattrs(struct inode *inode)
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{
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struct xattr_iter it;
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unsigned i;
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struct erofs_xattr_ibody_header *ih;
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struct erofs_sb_info *sbi;
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struct erofs_vnode *vi;
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bool atomic_map;
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if (likely(inode_has_inited_xattr(inode)))
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return;
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vi = EROFS_V(inode);
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BUG_ON(!vi->xattr_isize);
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sbi = EROFS_I_SB(inode);
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it.blkaddr = erofs_blknr(iloc(sbi, vi->nid) + vi->inode_isize);
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it.ofs = erofs_blkoff(iloc(sbi, vi->nid) + vi->inode_isize);
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it.page = erofs_get_inline_page(inode, it.blkaddr);
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BUG_ON(IS_ERR(it.page));
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/* read in shared xattr array (non-atomic, see kmalloc below) */
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it.kaddr = kmap(it.page);
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atomic_map = false;
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ih = (struct erofs_xattr_ibody_header *)(it.kaddr + it.ofs);
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vi->xattr_shared_count = ih->h_shared_count;
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vi->xattr_shared_xattrs = (unsigned *)kmalloc_array(
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vi->xattr_shared_count, sizeof(unsigned),
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GFP_KERNEL | __GFP_NOFAIL);
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/* let's skip ibody header */
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it.ofs += sizeof(struct erofs_xattr_ibody_header);
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for (i = 0; i < vi->xattr_shared_count; ++i) {
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if (unlikely(it.ofs >= EROFS_BLKSIZ)) {
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/* cannot be unaligned */
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BUG_ON(it.ofs != EROFS_BLKSIZ);
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xattr_iter_end(&it, atomic_map);
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it.page = erofs_get_meta_page(inode->i_sb,
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++it.blkaddr, S_ISDIR(inode->i_mode));
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BUG_ON(IS_ERR(it.page));
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it.kaddr = kmap_atomic(it.page);
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atomic_map = true;
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it.ofs = 0;
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}
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vi->xattr_shared_xattrs[i] =
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le32_to_cpu(*(__le32 *)(it.kaddr + it.ofs));
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it.ofs += sizeof(__le32);
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}
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xattr_iter_end(&it, atomic_map);
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inode_set_inited_xattr(inode);
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}
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struct xattr_iter_handlers {
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int (*entry)(struct xattr_iter *, struct erofs_xattr_entry *);
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int (*name)(struct xattr_iter *, unsigned, char *, unsigned);
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int (*alloc_buffer)(struct xattr_iter *, unsigned);
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void (*value)(struct xattr_iter *, unsigned, char *, unsigned);
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};
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static void xattr_iter_fixup(struct xattr_iter *it)
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{
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if (unlikely(it->ofs >= EROFS_BLKSIZ)) {
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xattr_iter_end(it, true);
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it->blkaddr += erofs_blknr(it->ofs);
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it->page = erofs_get_meta_page(it->sb, it->blkaddr, false);
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BUG_ON(IS_ERR(it->page));
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it->kaddr = kmap_atomic(it->page);
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it->ofs = erofs_blkoff(it->ofs);
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}
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}
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static int inline_xattr_iter_begin(struct xattr_iter *it,
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struct inode *inode)
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{
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struct erofs_vnode *const vi = EROFS_V(inode);
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struct erofs_sb_info *const sbi = EROFS_SB(inode->i_sb);
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unsigned xattr_header_sz, inline_xattr_ofs;
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xattr_header_sz = inlinexattr_header_size(inode);
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if (unlikely(xattr_header_sz >= vi->xattr_isize)) {
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BUG_ON(xattr_header_sz > vi->xattr_isize);
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return -ENOATTR;
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}
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inline_xattr_ofs = vi->inode_isize + xattr_header_sz;
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it->blkaddr = erofs_blknr(iloc(sbi, vi->nid) + inline_xattr_ofs);
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it->ofs = erofs_blkoff(iloc(sbi, vi->nid) + inline_xattr_ofs);
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it->page = erofs_get_inline_page(inode, it->blkaddr);
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BUG_ON(IS_ERR(it->page));
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it->kaddr = kmap_atomic(it->page);
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||||
return vi->xattr_isize - xattr_header_sz;
|
||||
}
|
||||
|
||||
static int xattr_foreach(struct xattr_iter *it,
|
||||
struct xattr_iter_handlers *op, unsigned *tlimit)
|
||||
{
|
||||
struct erofs_xattr_entry entry;
|
||||
unsigned value_sz, processed, slice;
|
||||
int err;
|
||||
|
||||
/* 0. fixup blkaddr, ofs, ipage */
|
||||
xattr_iter_fixup(it);
|
||||
|
||||
/*
|
||||
* 1. read xattr entry to the memory,
|
||||
* since we do EROFS_XATTR_ALIGN
|
||||
* therefore entry should be in the page
|
||||
*/
|
||||
entry = *(struct erofs_xattr_entry *)(it->kaddr + it->ofs);
|
||||
if (tlimit != NULL) {
|
||||
unsigned entry_sz = EROFS_XATTR_ENTRY_SIZE(&entry);
|
||||
|
||||
BUG_ON(*tlimit < entry_sz);
|
||||
*tlimit -= entry_sz;
|
||||
}
|
||||
|
||||
it->ofs += sizeof(struct erofs_xattr_entry);
|
||||
value_sz = le16_to_cpu(entry.e_value_size);
|
||||
|
||||
/* handle entry */
|
||||
err = op->entry(it, &entry);
|
||||
if (err) {
|
||||
it->ofs += entry.e_name_len + value_sz;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* 2. handle xattr name (ofs will finally be at the end of name) */
|
||||
processed = 0;
|
||||
|
||||
while (processed < entry.e_name_len) {
|
||||
if (it->ofs >= EROFS_BLKSIZ) {
|
||||
BUG_ON(it->ofs > EROFS_BLKSIZ);
|
||||
|
||||
xattr_iter_fixup(it);
|
||||
it->ofs = 0;
|
||||
}
|
||||
|
||||
slice = min_t(unsigned, PAGE_SIZE - it->ofs,
|
||||
entry.e_name_len - processed);
|
||||
|
||||
/* handle name */
|
||||
err = op->name(it, processed, it->kaddr + it->ofs, slice);
|
||||
if (err) {
|
||||
it->ofs += entry.e_name_len - processed + value_sz;
|
||||
goto out;
|
||||
}
|
||||
|
||||
it->ofs += slice;
|
||||
processed += slice;
|
||||
}
|
||||
|
||||
/* 3. handle xattr value */
|
||||
processed = 0;
|
||||
|
||||
if (op->alloc_buffer != NULL) {
|
||||
err = op->alloc_buffer(it, value_sz);
|
||||
if (err) {
|
||||
it->ofs += value_sz;
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
while (processed < value_sz) {
|
||||
if (it->ofs >= EROFS_BLKSIZ) {
|
||||
BUG_ON(it->ofs > EROFS_BLKSIZ);
|
||||
xattr_iter_fixup(it);
|
||||
it->ofs = 0;
|
||||
}
|
||||
|
||||
slice = min_t(unsigned, PAGE_SIZE - it->ofs,
|
||||
value_sz - processed);
|
||||
op->value(it, processed, it->kaddr + it->ofs, slice);
|
||||
it->ofs += slice;
|
||||
processed += slice;
|
||||
}
|
||||
|
||||
out:
|
||||
/* we assume that ofs is aligned with 4 bytes */
|
||||
it->ofs = EROFS_XATTR_ALIGN(it->ofs);
|
||||
return err;
|
||||
}
|
||||
|
||||
struct getxattr_iter {
|
||||
struct xattr_iter it;
|
||||
|
||||
char *buffer;
|
||||
int buffer_size, index;
|
||||
struct qstr name;
|
||||
};
|
||||
|
||||
static int xattr_entrymatch(struct xattr_iter *_it,
|
||||
struct erofs_xattr_entry *entry)
|
||||
{
|
||||
struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
|
||||
|
||||
return (it->index != entry->e_name_index ||
|
||||
it->name.len != entry->e_name_len) ? -ENOATTR : 0;
|
||||
}
|
||||
|
||||
static int xattr_namematch(struct xattr_iter *_it,
|
||||
unsigned processed, char *buf, unsigned len)
|
||||
{
|
||||
struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
|
||||
|
||||
return memcmp(buf, it->name.name + processed, len) ? -ENOATTR : 0;
|
||||
}
|
||||
|
||||
static int xattr_checkbuffer(struct xattr_iter *_it,
|
||||
unsigned value_sz)
|
||||
{
|
||||
struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
|
||||
int err = it->buffer_size < value_sz ? -ERANGE : 0;
|
||||
|
||||
it->buffer_size = value_sz;
|
||||
return it->buffer == NULL ? 1 : err;
|
||||
}
|
||||
|
||||
static void xattr_copyvalue(struct xattr_iter *_it,
|
||||
unsigned processed, char *buf, unsigned len)
|
||||
{
|
||||
struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
|
||||
|
||||
memcpy(it->buffer + processed, buf, len);
|
||||
}
|
||||
|
||||
static struct xattr_iter_handlers find_xattr_handlers = {
|
||||
.entry = xattr_entrymatch,
|
||||
.name = xattr_namematch,
|
||||
.alloc_buffer = xattr_checkbuffer,
|
||||
.value = xattr_copyvalue
|
||||
};
|
||||
|
||||
static int inline_getxattr(struct inode *inode, struct getxattr_iter *it)
|
||||
{
|
||||
int ret;
|
||||
unsigned remaining;
|
||||
|
||||
ret = inline_xattr_iter_begin(&it->it, inode);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
remaining = ret;
|
||||
while (remaining) {
|
||||
if ((ret = xattr_foreach(&it->it,
|
||||
&find_xattr_handlers, &remaining)) >= 0)
|
||||
break;
|
||||
}
|
||||
xattr_iter_end(&it->it, true);
|
||||
|
||||
return ret < 0 ? ret : it->buffer_size;
|
||||
}
|
||||
|
||||
static int shared_getxattr(struct inode *inode, struct getxattr_iter *it)
|
||||
{
|
||||
struct erofs_vnode *const vi = EROFS_V(inode);
|
||||
struct erofs_sb_info *const sbi = EROFS_SB(inode->i_sb);
|
||||
unsigned i;
|
||||
int ret = -ENOATTR;
|
||||
|
||||
for (i = 0; i < vi->xattr_shared_count; ++i) {
|
||||
erofs_blk_t blkaddr =
|
||||
xattrblock_addr(sbi, vi->xattr_shared_xattrs[i]);
|
||||
|
||||
it->it.ofs = xattrblock_offset(sbi, vi->xattr_shared_xattrs[i]);
|
||||
|
||||
if (!i || blkaddr != it->it.blkaddr) {
|
||||
if (i)
|
||||
xattr_iter_end(&it->it, true);
|
||||
|
||||
it->it.page = erofs_get_meta_page(inode->i_sb,
|
||||
blkaddr, false);
|
||||
BUG_ON(IS_ERR(it->it.page));
|
||||
it->it.kaddr = kmap_atomic(it->it.page);
|
||||
it->it.blkaddr = blkaddr;
|
||||
}
|
||||
|
||||
if ((ret = xattr_foreach(&it->it,
|
||||
&find_xattr_handlers, NULL)) >= 0)
|
||||
break;
|
||||
}
|
||||
if (vi->xattr_shared_count)
|
||||
xattr_iter_end(&it->it, true);
|
||||
|
||||
return ret < 0 ? ret : it->buffer_size;
|
||||
}
|
||||
|
||||
static bool erofs_xattr_user_list(struct dentry *dentry)
|
||||
{
|
||||
return test_opt(EROFS_SB(dentry->d_sb), XATTR_USER);
|
||||
}
|
||||
|
||||
static bool erofs_xattr_trusted_list(struct dentry *dentry)
|
||||
{
|
||||
return capable(CAP_SYS_ADMIN);
|
||||
}
|
||||
|
||||
int erofs_getxattr(struct inode *inode, int index,
|
||||
const char *name,
|
||||
void *buffer, size_t buffer_size)
|
||||
{
|
||||
int ret;
|
||||
struct getxattr_iter it;
|
||||
|
||||
if (unlikely(name == NULL))
|
||||
return -EINVAL;
|
||||
|
||||
init_inode_xattrs(inode);
|
||||
|
||||
it.index = index;
|
||||
|
||||
it.name.len = strlen(name);
|
||||
if (it.name.len > EROFS_NAME_LEN)
|
||||
return -ERANGE;
|
||||
it.name.name = name;
|
||||
|
||||
it.buffer = buffer;
|
||||
it.buffer_size = buffer_size;
|
||||
|
||||
it.it.sb = inode->i_sb;
|
||||
ret = inline_getxattr(inode, &it);
|
||||
if (ret == -ENOATTR)
|
||||
ret = shared_getxattr(inode, &it);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int erofs_xattr_generic_get(const struct xattr_handler *handler,
|
||||
struct dentry *unused, struct inode *inode,
|
||||
const char *name, void *buffer, size_t size)
|
||||
{
|
||||
struct erofs_vnode *const vi = EROFS_V(inode);
|
||||
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
|
||||
|
||||
switch (handler->flags) {
|
||||
case EROFS_XATTR_INDEX_USER:
|
||||
if (!test_opt(sbi, XATTR_USER))
|
||||
return -EOPNOTSUPP;
|
||||
break;
|
||||
case EROFS_XATTR_INDEX_TRUSTED:
|
||||
if (!capable(CAP_SYS_ADMIN))
|
||||
return -EPERM;
|
||||
break;
|
||||
case EROFS_XATTR_INDEX_SECURITY:
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (!vi->xattr_isize)
|
||||
return -ENOATTR;
|
||||
|
||||
return erofs_getxattr(inode, handler->flags, name, buffer, size);
|
||||
}
|
||||
|
||||
const struct xattr_handler erofs_xattr_user_handler = {
|
||||
.prefix = XATTR_USER_PREFIX,
|
||||
.flags = EROFS_XATTR_INDEX_USER,
|
||||
.list = erofs_xattr_user_list,
|
||||
.get = erofs_xattr_generic_get,
|
||||
};
|
||||
|
||||
const struct xattr_handler erofs_xattr_trusted_handler = {
|
||||
.prefix = XATTR_TRUSTED_PREFIX,
|
||||
.flags = EROFS_XATTR_INDEX_TRUSTED,
|
||||
.list = erofs_xattr_trusted_list,
|
||||
.get = erofs_xattr_generic_get,
|
||||
};
|
||||
|
||||
#ifdef CONFIG_EROFS_FS_SECURITY
|
||||
const struct xattr_handler __maybe_unused erofs_xattr_security_handler = {
|
||||
.prefix = XATTR_SECURITY_PREFIX,
|
||||
.flags = EROFS_XATTR_INDEX_SECURITY,
|
||||
.get = erofs_xattr_generic_get,
|
||||
};
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_EROFS_FS_XATTR
|
||||
const struct xattr_handler *erofs_xattr_handlers[] = {
|
||||
&erofs_xattr_user_handler,
|
||||
#ifdef CONFIG_EROFS_FS_POSIX_ACL
|
||||
&posix_acl_access_xattr_handler,
|
||||
&posix_acl_default_xattr_handler,
|
||||
#endif
|
||||
&erofs_xattr_trusted_handler,
|
||||
#ifdef CONFIG_EROFS_FS_SECURITY
|
||||
&erofs_xattr_security_handler,
|
||||
#endif
|
||||
NULL,
|
||||
};
|
||||
#endif
|
||||
|
||||
struct listxattr_iter {
|
||||
struct xattr_iter it;
|
||||
|
||||
struct dentry *dentry;
|
||||
char *buffer;
|
||||
int buffer_size, buffer_ofs;
|
||||
};
|
||||
|
||||
static int xattr_entrylist(struct xattr_iter *_it,
|
||||
struct erofs_xattr_entry *entry)
|
||||
{
|
||||
struct listxattr_iter *it =
|
||||
container_of(_it, struct listxattr_iter, it);
|
||||
unsigned prefix_len;
|
||||
const char *prefix;
|
||||
|
||||
const struct xattr_handler *h =
|
||||
erofs_xattr_handler(entry->e_name_index);
|
||||
|
||||
if (h == NULL || (h->list != NULL && !h->list(it->dentry)))
|
||||
return 1;
|
||||
|
||||
/* Note that at least one of 'prefix' and 'name' should be non-NULL */
|
||||
prefix = h->prefix != NULL ? h->prefix : h->name;
|
||||
prefix_len = strlen(prefix);
|
||||
|
||||
if (it->buffer == NULL) {
|
||||
it->buffer_ofs += prefix_len + entry->e_name_len + 1;
|
||||
return 1;
|
||||
}
|
||||
|
||||
if (it->buffer_ofs + prefix_len
|
||||
+ entry->e_name_len + 1 > it->buffer_size)
|
||||
return -ERANGE;
|
||||
|
||||
memcpy(it->buffer + it->buffer_ofs, prefix, prefix_len);
|
||||
it->buffer_ofs += prefix_len;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int xattr_namelist(struct xattr_iter *_it,
|
||||
unsigned processed, char *buf, unsigned len)
|
||||
{
|
||||
struct listxattr_iter *it =
|
||||
container_of(_it, struct listxattr_iter, it);
|
||||
|
||||
memcpy(it->buffer + it->buffer_ofs, buf, len);
|
||||
it->buffer_ofs += len;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int xattr_skipvalue(struct xattr_iter *_it,
|
||||
unsigned value_sz)
|
||||
{
|
||||
struct listxattr_iter *it =
|
||||
container_of(_it, struct listxattr_iter, it);
|
||||
|
||||
it->buffer[it->buffer_ofs++] = '\0';
|
||||
return 1;
|
||||
}
|
||||
|
||||
static struct xattr_iter_handlers list_xattr_handlers = {
|
||||
.entry = xattr_entrylist,
|
||||
.name = xattr_namelist,
|
||||
.alloc_buffer = xattr_skipvalue,
|
||||
.value = NULL
|
||||
};
|
||||
|
||||
static int inline_listxattr(struct listxattr_iter *it)
|
||||
{
|
||||
int ret;
|
||||
unsigned remaining;
|
||||
|
||||
ret = inline_xattr_iter_begin(&it->it, d_inode(it->dentry));
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
remaining = ret;
|
||||
while (remaining) {
|
||||
if ((ret = xattr_foreach(&it->it,
|
||||
&list_xattr_handlers, &remaining)) < 0)
|
||||
break;
|
||||
}
|
||||
xattr_iter_end(&it->it, true);
|
||||
return ret < 0 ? ret : it->buffer_ofs;
|
||||
}
|
||||
|
||||
static int shared_listxattr(struct listxattr_iter *it)
|
||||
{
|
||||
struct inode *const inode = d_inode(it->dentry);
|
||||
struct erofs_vnode *const vi = EROFS_V(inode);
|
||||
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
|
||||
unsigned i;
|
||||
int ret = 0;
|
||||
|
||||
for (i = 0; i < vi->xattr_shared_count; ++i) {
|
||||
erofs_blk_t blkaddr =
|
||||
xattrblock_addr(sbi, vi->xattr_shared_xattrs[i]);
|
||||
|
||||
it->it.ofs = xattrblock_offset(sbi, vi->xattr_shared_xattrs[i]);
|
||||
if (!i || blkaddr != it->it.blkaddr) {
|
||||
if (i)
|
||||
xattr_iter_end(&it->it, true);
|
||||
|
||||
it->it.page = erofs_get_meta_page(inode->i_sb,
|
||||
blkaddr, false);
|
||||
BUG_ON(IS_ERR(it->it.page));
|
||||
it->it.kaddr = kmap_atomic(it->it.page);
|
||||
it->it.blkaddr = blkaddr;
|
||||
}
|
||||
|
||||
if ((ret = xattr_foreach(&it->it,
|
||||
&list_xattr_handlers, NULL)) < 0)
|
||||
break;
|
||||
}
|
||||
if (vi->xattr_shared_count)
|
||||
xattr_iter_end(&it->it, true);
|
||||
|
||||
return ret < 0 ? ret : it->buffer_ofs;
|
||||
}
|
||||
|
||||
ssize_t erofs_listxattr(struct dentry *dentry,
|
||||
char *buffer, size_t buffer_size)
|
||||
{
|
||||
int ret;
|
||||
struct listxattr_iter it;
|
||||
|
||||
init_inode_xattrs(d_inode(dentry));
|
||||
|
||||
it.dentry = dentry;
|
||||
it.buffer = buffer;
|
||||
it.buffer_size = buffer_size;
|
||||
it.buffer_ofs = 0;
|
||||
|
||||
it.it.sb = dentry->d_sb;
|
||||
|
||||
ret = inline_listxattr(&it);
|
||||
if (ret < 0 && ret != -ENOATTR)
|
||||
return ret;
|
||||
return shared_listxattr(&it);
|
||||
}
|
||||
|
93
drivers/staging/erofs/xattr.h
Normal file
93
drivers/staging/erofs/xattr.h
Normal file
|
@ -0,0 +1,93 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0
|
||||
*
|
||||
* linux/drivers/staging/erofs/xattr.h
|
||||
*
|
||||
* Copyright (C) 2017-2018 HUAWEI, Inc.
|
||||
* http://www.huawei.com/
|
||||
* Created by Gao Xiang <gaoxiang25@huawei.com>
|
||||
*
|
||||
* This file is subject to the terms and conditions of the GNU General Public
|
||||
* License. See the file COPYING in the main directory of the Linux
|
||||
* distribution for more details.
|
||||
*/
|
||||
#ifndef __EROFS_XATTR_H
|
||||
#define __EROFS_XATTR_H
|
||||
|
||||
#include "internal.h"
|
||||
#include <linux/posix_acl_xattr.h>
|
||||
#include <linux/xattr.h>
|
||||
|
||||
/* Attribute not found */
|
||||
#define ENOATTR ENODATA
|
||||
|
||||
static inline unsigned inlinexattr_header_size(struct inode *inode)
|
||||
{
|
||||
return sizeof(struct erofs_xattr_ibody_header)
|
||||
+ sizeof(u32) * EROFS_V(inode)->xattr_shared_count;
|
||||
}
|
||||
|
||||
static inline erofs_blk_t
|
||||
xattrblock_addr(struct erofs_sb_info *sbi, unsigned xattr_id)
|
||||
{
|
||||
#ifdef CONFIG_EROFS_FS_XATTR
|
||||
return sbi->xattr_blkaddr +
|
||||
xattr_id * sizeof(__u32) / EROFS_BLKSIZ;
|
||||
#else
|
||||
return 0;
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline unsigned
|
||||
xattrblock_offset(struct erofs_sb_info *sbi, unsigned xattr_id)
|
||||
{
|
||||
return (xattr_id * sizeof(__u32)) % EROFS_BLKSIZ;
|
||||
}
|
||||
|
||||
extern const struct xattr_handler erofs_xattr_user_handler;
|
||||
extern const struct xattr_handler erofs_xattr_trusted_handler;
|
||||
#ifdef CONFIG_EROFS_FS_SECURITY
|
||||
extern const struct xattr_handler erofs_xattr_security_handler;
|
||||
#endif
|
||||
|
||||
static inline const struct xattr_handler *erofs_xattr_handler(unsigned index)
|
||||
{
|
||||
static const struct xattr_handler *xattr_handler_map[] = {
|
||||
[EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
|
||||
#ifdef CONFIG_EROFS_FS_POSIX_ACL
|
||||
[EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
|
||||
[EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] =
|
||||
&posix_acl_default_xattr_handler,
|
||||
#endif
|
||||
[EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
|
||||
#ifdef CONFIG_EROFS_FS_SECURITY
|
||||
[EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
|
||||
#endif
|
||||
};
|
||||
return index && index < ARRAY_SIZE(xattr_handler_map) ?
|
||||
xattr_handler_map[index] : NULL;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_EROFS_FS_XATTR
|
||||
|
||||
extern const struct inode_operations erofs_generic_xattr_iops;
|
||||
extern const struct inode_operations erofs_dir_xattr_iops;
|
||||
|
||||
int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
|
||||
ssize_t erofs_listxattr(struct dentry *, char *, size_t);
|
||||
#else
|
||||
static int __maybe_unused erofs_getxattr(struct inode *inode, int index,
|
||||
const char *name,
|
||||
void *buffer, size_t buffer_size)
|
||||
{
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
|
||||
static ssize_t __maybe_unused erofs_listxattr(struct dentry *dentry,
|
||||
char *buffer, size_t buffer_size)
|
||||
{
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif
|
||||
|
Loading…
Reference in a new issue