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