Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / ext4 / xattr.h

diff --git a/kernel/fs/ext4/xattr.h b/kernel/fs/ext4/xattr.h
new file mode 100644 (file)
index 0000000..ddc0957
--- /dev/null
+++ b/kernel/fs/ext4/xattr.h
@@ -0,0 +1,139 @@
+/*
+  File: fs/ext4/xattr.h
+
+  On-disk format of extended attributes for the ext4 filesystem.
+
+  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
+*/
+
+#include <linux/xattr.h>
+
+/* Magic value in attribute blocks */
+#define EXT4_XATTR_MAGIC               0xEA020000
+
+/* Maximum number of references to one attribute block */
+#define EXT4_XATTR_REFCOUNT_MAX                1024
+
+/* Name indexes */
+#define EXT4_XATTR_INDEX_USER                  1
+#define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS      2
+#define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT     3
+#define EXT4_XATTR_INDEX_TRUSTED               4
+#define        EXT4_XATTR_INDEX_LUSTRE                 5
+#define EXT4_XATTR_INDEX_SECURITY              6
+#define EXT4_XATTR_INDEX_SYSTEM                        7
+#define EXT4_XATTR_INDEX_RICHACL               8
+#define EXT4_XATTR_INDEX_ENCRYPTION            9
+
+struct ext4_xattr_header {
+       __le32  h_magic;        /* magic number for identification */
+       __le32  h_refcount;     /* reference count */
+       __le32  h_blocks;       /* number of disk blocks used */
+       __le32  h_hash;         /* hash value of all attributes */
+       __le32  h_checksum;     /* crc32c(uuid+id+xattrblock) */
+                               /* id = inum if refcount=1, blknum otherwise */
+       __u32   h_reserved[3];  /* zero right now */
+};
+
+struct ext4_xattr_ibody_header {
+       __le32  h_magic;        /* magic number for identification */
+};
+
+struct ext4_xattr_entry {
+       __u8    e_name_len;     /* length of name */
+       __u8    e_name_index;   /* attribute name index */
+       __le16  e_value_offs;   /* offset in disk block of value */
+       __le32  e_value_block;  /* disk block attribute is stored on (n/i) */
+       __le32  e_value_size;   /* size of attribute value */
+       __le32  e_hash;         /* hash value of name and value */
+       char    e_name[0];      /* attribute name */
+};
+
+#define EXT4_XATTR_PAD_BITS            2
+#define EXT4_XATTR_PAD         (1<<EXT4_XATTR_PAD_BITS)
+#define EXT4_XATTR_ROUND               (EXT4_XATTR_PAD-1)
+#define EXT4_XATTR_LEN(name_len) \
+       (((name_len) + EXT4_XATTR_ROUND + \
+       sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
+#define EXT4_XATTR_NEXT(entry) \
+       ((struct ext4_xattr_entry *)( \
+        (char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)))
+#define EXT4_XATTR_SIZE(size) \
+       (((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
+
+#define IHDR(inode, raw_inode) \
+       ((struct ext4_xattr_ibody_header *) \
+               ((void *)raw_inode + \
+               EXT4_GOOD_OLD_INODE_SIZE + \
+               EXT4_I(inode)->i_extra_isize))
+#define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))
+
+#define BHDR(bh) ((struct ext4_xattr_header *)((bh)->b_data))
+#define ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr))
+#define BFIRST(bh) ENTRY(BHDR(bh)+1)
+#define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)
+
+#define EXT4_ZERO_XATTR_VALUE ((void *)-1)
+
+struct ext4_xattr_info {
+       int name_index;
+       const char *name;
+       const void *value;
+       size_t value_len;
+};
+
+struct ext4_xattr_search {
+       struct ext4_xattr_entry *first;
+       void *base;
+       void *end;
+       struct ext4_xattr_entry *here;
+       int not_found;
+};
+
+struct ext4_xattr_ibody_find {
+       struct ext4_xattr_search s;
+       struct ext4_iloc iloc;
+};
+
+extern const struct xattr_handler ext4_xattr_user_handler;
+extern const struct xattr_handler ext4_xattr_trusted_handler;
+extern const struct xattr_handler ext4_xattr_security_handler;
+
+#define EXT4_XATTR_NAME_ENCRYPTION_CONTEXT "c"
+
+extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);
+
+extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);
+extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
+extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
+
+extern void ext4_xattr_delete_inode(handle_t *, struct inode *);
+extern void ext4_xattr_put_super(struct super_block *);
+
+extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
+                           struct ext4_inode *raw_inode, handle_t *handle);
+
+extern const struct xattr_handler *ext4_xattr_handlers[];
+
+extern int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i,
+                                struct ext4_xattr_ibody_find *is);
+extern int ext4_xattr_ibody_get(struct inode *inode, int name_index,
+                               const char *name,
+                               void *buffer, size_t buffer_size);
+extern int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode,
+                                      struct ext4_xattr_info *i,
+                                      struct ext4_xattr_ibody_find *is);
+
+extern struct mb_cache *ext4_xattr_create_cache(char *name);
+extern void ext4_xattr_destroy_cache(struct mb_cache *);
+
+#ifdef CONFIG_EXT4_FS_SECURITY
+extern int ext4_init_security(handle_t *handle, struct inode *inode,
+                             struct inode *dir, const struct qstr *qstr);
+#else
+static inline int ext4_init_security(handle_t *handle, struct inode *inode,
+                                    struct inode *dir, const struct qstr *qstr)
+{
+       return 0;
+}
+#endif