mirror of
https://github.com/torvalds/linux
synced 2024-09-06 09:51:23 +00:00
0d812f77b3
Now we that store data in the inode, in case we need to store some xattrs and inode doesn't have enough space, Andreas suggested that we should keep the xattr(metadata) in and data should be pushed out. So this patch does the work. Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
426 lines
11 KiB
C
426 lines
11 KiB
C
/*
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File: fs/ext4/xattr.h
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On-disk format of extended attributes for the ext4 filesystem.
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(C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
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*/
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#include <linux/xattr.h>
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/* Magic value in attribute blocks */
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#define EXT4_XATTR_MAGIC 0xEA020000
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/* Maximum number of references to one attribute block */
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#define EXT4_XATTR_REFCOUNT_MAX 1024
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/* Name indexes */
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#define EXT4_XATTR_INDEX_USER 1
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#define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS 2
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#define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT 3
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#define EXT4_XATTR_INDEX_TRUSTED 4
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#define EXT4_XATTR_INDEX_LUSTRE 5
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#define EXT4_XATTR_INDEX_SECURITY 6
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#define EXT4_XATTR_INDEX_SYSTEM 7
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struct ext4_xattr_header {
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__le32 h_magic; /* magic number for identification */
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__le32 h_refcount; /* reference count */
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__le32 h_blocks; /* number of disk blocks used */
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__le32 h_hash; /* hash value of all attributes */
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__le32 h_checksum; /* crc32c(uuid+id+xattrblock) */
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/* id = inum if refcount=1, blknum otherwise */
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__u32 h_reserved[3]; /* zero right now */
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};
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struct ext4_xattr_ibody_header {
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__le32 h_magic; /* magic number for identification */
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};
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struct ext4_xattr_entry {
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__u8 e_name_len; /* length of name */
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__u8 e_name_index; /* attribute name index */
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__le16 e_value_offs; /* offset in disk block of value */
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__le32 e_value_block; /* disk block attribute is stored on (n/i) */
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__le32 e_value_size; /* size of attribute value */
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__le32 e_hash; /* hash value of name and value */
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char e_name[0]; /* attribute name */
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};
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#define EXT4_XATTR_PAD_BITS 2
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#define EXT4_XATTR_PAD (1<<EXT4_XATTR_PAD_BITS)
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#define EXT4_XATTR_ROUND (EXT4_XATTR_PAD-1)
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#define EXT4_XATTR_LEN(name_len) \
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(((name_len) + EXT4_XATTR_ROUND + \
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sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
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#define EXT4_XATTR_NEXT(entry) \
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((struct ext4_xattr_entry *)( \
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(char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)))
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#define EXT4_XATTR_SIZE(size) \
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(((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
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#define IHDR(inode, raw_inode) \
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((struct ext4_xattr_ibody_header *) \
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((void *)raw_inode + \
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EXT4_GOOD_OLD_INODE_SIZE + \
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EXT4_I(inode)->i_extra_isize))
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#define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))
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#define BHDR(bh) ((struct ext4_xattr_header *)((bh)->b_data))
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#define ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr))
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#define BFIRST(bh) ENTRY(BHDR(bh)+1)
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#define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)
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struct ext4_xattr_info {
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int name_index;
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const char *name;
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const void *value;
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size_t value_len;
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};
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struct ext4_xattr_search {
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struct ext4_xattr_entry *first;
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void *base;
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void *end;
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struct ext4_xattr_entry *here;
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int not_found;
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};
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struct ext4_xattr_ibody_find {
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struct ext4_xattr_search s;
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struct ext4_iloc iloc;
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};
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# ifdef CONFIG_EXT4_FS_XATTR
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extern const struct xattr_handler ext4_xattr_user_handler;
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extern const struct xattr_handler ext4_xattr_trusted_handler;
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extern const struct xattr_handler ext4_xattr_acl_access_handler;
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extern const struct xattr_handler ext4_xattr_acl_default_handler;
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extern const struct xattr_handler ext4_xattr_security_handler;
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extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);
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extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);
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extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
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extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
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extern void ext4_xattr_delete_inode(handle_t *, struct inode *);
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extern void ext4_xattr_put_super(struct super_block *);
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extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
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struct ext4_inode *raw_inode, handle_t *handle);
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extern int __init ext4_init_xattr(void);
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extern void ext4_exit_xattr(void);
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extern const struct xattr_handler *ext4_xattr_handlers[];
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extern int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i,
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struct ext4_xattr_ibody_find *is);
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extern int ext4_xattr_ibody_get(struct inode *inode, int name_index,
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const char *name,
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void *buffer, size_t buffer_size);
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extern int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode,
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struct ext4_xattr_info *i,
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struct ext4_xattr_ibody_find *is);
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extern int ext4_has_inline_data(struct inode *inode);
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extern int ext4_get_inline_size(struct inode *inode);
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extern int ext4_get_max_inline_size(struct inode *inode);
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extern int ext4_find_inline_data_nolock(struct inode *inode);
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extern void ext4_write_inline_data(struct inode *inode,
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struct ext4_iloc *iloc,
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void *buffer, loff_t pos,
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unsigned int len);
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extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
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unsigned int len);
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extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
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unsigned int len);
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extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
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extern int ext4_readpage_inline(struct inode *inode, struct page *page);
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extern int ext4_try_to_write_inline_data(struct address_space *mapping,
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struct inode *inode,
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loff_t pos, unsigned len,
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unsigned flags,
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struct page **pagep);
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extern int ext4_write_inline_data_end(struct inode *inode,
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loff_t pos, unsigned len,
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unsigned copied,
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struct page *page);
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extern struct buffer_head *
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ext4_journalled_write_inline_data(struct inode *inode,
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unsigned len,
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struct page *page);
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extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
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struct inode *inode,
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loff_t pos, unsigned len,
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unsigned flags,
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struct page **pagep,
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void **fsdata);
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extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
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unsigned len, unsigned copied,
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struct page *page);
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extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
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struct inode *inode);
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extern int ext4_try_create_inline_dir(handle_t *handle,
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struct inode *parent,
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struct inode *inode);
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extern int ext4_read_inline_dir(struct file *filp,
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void *dirent, filldir_t filldir,
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int *has_inline_data);
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extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
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const struct qstr *d_name,
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struct ext4_dir_entry_2 **res_dir,
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int *has_inline_data);
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extern int ext4_delete_inline_entry(handle_t *handle,
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struct inode *dir,
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struct ext4_dir_entry_2 *de_del,
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struct buffer_head *bh,
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int *has_inline_data);
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extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
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extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
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struct ext4_dir_entry_2 **parent_de,
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int *retval);
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extern int ext4_inline_data_fiemap(struct inode *inode,
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struct fiemap_extent_info *fieinfo,
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int *has_inline);
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extern int ext4_try_to_evict_inline_data(handle_t *handle,
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struct inode *inode,
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int needed);
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# else /* CONFIG_EXT4_FS_XATTR */
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static inline int
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ext4_xattr_get(struct inode *inode, int name_index, const char *name,
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void *buffer, size_t size, int flags)
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{
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return -EOPNOTSUPP;
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}
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static inline int
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ext4_xattr_set(struct inode *inode, int name_index, const char *name,
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const void *value, size_t size, int flags)
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{
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return -EOPNOTSUPP;
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}
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static inline int
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ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
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const char *name, const void *value, size_t size, int flags)
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{
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return -EOPNOTSUPP;
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}
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static inline void
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ext4_xattr_delete_inode(handle_t *handle, struct inode *inode)
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{
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}
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static inline void
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ext4_xattr_put_super(struct super_block *sb)
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{
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}
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static __init inline int
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ext4_init_xattr(void)
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{
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return 0;
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}
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static inline void
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ext4_exit_xattr(void)
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{
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}
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static inline int
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ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
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struct ext4_inode *raw_inode, handle_t *handle)
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{
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return -EOPNOTSUPP;
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}
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#define ext4_xattr_handlers NULL
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static inline int
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ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i,
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struct ext4_xattr_ibody_find *is)
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{
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return -EOPNOTSUPP;
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}
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static inline int
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ext4_xattr_ibody_set(handle_t *handle, struct inode *inode,
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struct ext4_xattr_info *i,
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struct ext4_xattr_ibody_find *is)
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{
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return -EOPNOTSUPP;
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}
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static inline int
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ext4_xattr_ibody_get(struct inode *inode, int name_index,
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const char *name,
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void *buffer, size_t buffer_size)
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{
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return -EOPNOTSUPP;
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}
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static inline int ext4_find_inline_data_nolock(struct inode *inode)
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{
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return 0;
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}
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static inline int ext4_has_inline_data(struct inode *inode)
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{
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return 0;
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}
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static inline int ext4_get_inline_size(struct inode *inode)
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{
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return 0;
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}
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static inline int ext4_get_max_inline_size(struct inode *inode)
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{
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return 0;
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}
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static inline void ext4_write_inline_data(struct inode *inode,
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struct ext4_iloc *iloc,
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void *buffer, loff_t pos,
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unsigned int len)
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{
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return;
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}
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static inline int ext4_init_inline_data(handle_t *handle,
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struct inode *inode,
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unsigned int len)
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{
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return 0;
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}
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static inline int ext4_destroy_inline_data(handle_t *handle,
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struct inode *inode)
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{
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return 0;
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}
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static inline int ext4_readpage_inline(struct inode *inode, struct page *page)
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{
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return 0;
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}
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static inline int ext4_try_to_write_inline_data(struct address_space *mapping,
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struct inode *inode,
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loff_t pos, unsigned len,
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unsigned flags,
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struct page **pagep)
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{
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return 0;
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}
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static inline int ext4_write_inline_data_end(struct inode *inode,
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loff_t pos, unsigned len,
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unsigned copied,
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struct page *page)
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{
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return 0;
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}
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static inline struct buffer_head *
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ext4_journalled_write_inline_data(struct inode *inode,
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unsigned len,
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struct page *page)
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{
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return NULL;
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}
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static inline int
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ext4_da_write_inline_data_begin(struct address_space *mapping,
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struct inode *inode,
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loff_t pos, unsigned len,
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unsigned flags,
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struct page **pagep,
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void **fsdata)
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{
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return 0;
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}
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static inline int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
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unsigned len, unsigned copied,
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struct page *page)
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{
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return 0;
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}
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static inline int ext4_try_add_inline_entry(handle_t *handle,
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struct dentry *dentry,
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struct inode *inode)
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{
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return 0;
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}
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static inline int ext4_try_create_inline_dir(handle_t *handle,
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struct inode *parent,
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struct inode *inode)
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{
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return 0;
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}
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static inline int ext4_read_inline_dir(struct file *filp,
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void *dirent, filldir_t filldir,
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int *has_inline_data)
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{
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return 0;
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}
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static inline struct buffer_head *
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ext4_find_inline_entry(struct inode *dir,
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const struct qstr *d_name,
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struct ext4_dir_entry_2 **res_dir,
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int *has_inline_data)
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{
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return NULL;
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}
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static inline int ext4_delete_inline_entry(handle_t *handle,
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struct inode *dir,
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struct ext4_dir_entry_2 *de_del,
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struct buffer_head *bh,
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int *has_inline_data)
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{
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return 0;
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}
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static inline int empty_inline_dir(struct inode *dir, int *has_inline_data)
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{
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return 0;
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}
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static inline struct buffer_head *
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ext4_get_first_inline_block(struct inode *inode,
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struct ext4_dir_entry_2 **parent_de,
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int *retval)
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{
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return NULL;
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}
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static inline int ext4_inline_data_fiemap(struct inode *inode,
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struct fiemap_extent_info *fieinfo,
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int *has_inline)
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{
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return 0;
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}
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# endif /* CONFIG_EXT4_FS_XATTR */
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#ifdef CONFIG_EXT4_FS_SECURITY
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extern int ext4_init_security(handle_t *handle, struct inode *inode,
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struct inode *dir, const struct qstr *qstr);
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#else
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static inline int ext4_init_security(handle_t *handle, struct inode *inode,
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struct inode *dir, const struct qstr *qstr)
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{
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return 0;
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}
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#endif
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