1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #include <linux/reiserfs_xattr.h> 3 #include <linux/init.h> 4 #include <linux/list.h> 5 #include <linux/rwsem.h> 6 #include <linux/xattr.h> 7 8 struct inode; 9 struct dentry; 10 struct iattr; 11 struct super_block; 12 13 int reiserfs_xattr_register_handlers(void) __init; 14 void reiserfs_xattr_unregister_handlers(void); 15 int reiserfs_xattr_init(struct super_block *sb, int mount_flags); 16 int reiserfs_lookup_privroot(struct super_block *sb); 17 int reiserfs_delete_xattrs(struct inode *inode); 18 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs); 19 int reiserfs_permission(struct user_namespace *mnt_userns, 20 struct inode *inode, int mask); 21 22 #ifdef CONFIG_REISERFS_FS_XATTR 23 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir) 24 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size); 25 26 int reiserfs_xattr_get(struct inode *, const char *, void *, size_t); 27 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int); 28 int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *, 29 struct inode *, const char *, const void *, 30 size_t, int); 31 32 extern const struct xattr_handler reiserfs_xattr_user_handler; 33 extern const struct xattr_handler reiserfs_xattr_trusted_handler; 34 extern const struct xattr_handler reiserfs_xattr_security_handler; 35 #ifdef CONFIG_REISERFS_FS_SECURITY 36 int reiserfs_security_init(struct inode *dir, struct inode *inode, 37 const struct qstr *qstr, 38 struct reiserfs_security_handle *sec); 39 int reiserfs_security_write(struct reiserfs_transaction_handle *th, 40 struct inode *inode, 41 struct reiserfs_security_handle *sec); 42 void reiserfs_security_free(struct reiserfs_security_handle *sec); 43 #endif 44 45 static inline int reiserfs_xattrs_initialized(struct super_block *sb) 46 { 47 return REISERFS_SB(sb)->priv_root && REISERFS_SB(sb)->xattr_root; 48 } 49 50 #define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header)) 51 static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size) 52 { 53 loff_t ret = 0; 54 if (reiserfs_file_data_log(inode)) { 55 ret = _ROUND_UP(xattr_size(size), inode->i_sb->s_blocksize); 56 ret >>= inode->i_sb->s_blocksize_bits; 57 } 58 return ret; 59 } 60 61 /* 62 * We may have to create up to 3 objects: xattr root, xattr dir, xattr file. 63 * Let's try to be smart about it. 64 * xattr root: We cache it. If it's not cached, we may need to create it. 65 * xattr dir: If anything has been loaded for this inode, we can set a flag 66 * saying so. 67 * xattr file: Since we don't cache xattrs, we can't tell. We always include 68 * blocks for it. 69 * 70 * However, since root and dir can be created between calls - YOU MUST SAVE 71 * THIS VALUE. 72 */ 73 static inline size_t reiserfs_xattr_jcreate_nblocks(struct inode *inode) 74 { 75 size_t nblocks = JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb); 76 77 if ((REISERFS_I(inode)->i_flags & i_has_xattr_dir) == 0) { 78 nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb); 79 if (d_really_is_negative(REISERFS_SB(inode->i_sb)->xattr_root)) 80 nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb); 81 } 82 83 return nblocks; 84 } 85 86 static inline void reiserfs_init_xattr_rwsem(struct inode *inode) 87 { 88 init_rwsem(&REISERFS_I(inode)->i_xattr_sem); 89 } 90 91 #else 92 93 #define reiserfs_listxattr NULL 94 95 static inline void reiserfs_init_xattr_rwsem(struct inode *inode) 96 { 97 } 98 #endif /* CONFIG_REISERFS_FS_XATTR */ 99 100 #ifndef CONFIG_REISERFS_FS_SECURITY 101 static inline int reiserfs_security_init(struct inode *dir, 102 struct inode *inode, 103 const struct qstr *qstr, 104 struct reiserfs_security_handle *sec) 105 { 106 return 0; 107 } 108 static inline int 109 reiserfs_security_write(struct reiserfs_transaction_handle *th, 110 struct inode *inode, 111 struct reiserfs_security_handle *sec) 112 { 113 return 0; 114 } 115 static inline void reiserfs_security_free(struct reiserfs_security_handle *sec) 116 {} 117 #endif 118