be0726d33c
The conversion is generally straightforward. We convert filesystem from a global cache to per-fs one. Similarly to ext4 the tricky part is that xattr block corresponding to found mbcache entry can get freed before we get buffer lock for that block. So we have to check whether the entry is still valid after getting the buffer lock. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/*
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File: linux/ext2_xattr.h
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On-disk format of extended attributes for the ext2 filesystem.
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(C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
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*/
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#include <linux/init.h>
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#include <linux/xattr.h>
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/* Magic value in attribute blocks */
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#define EXT2_XATTR_MAGIC 0xEA020000
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/* Maximum number of references to one attribute block */
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#define EXT2_XATTR_REFCOUNT_MAX 1024
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/* Name indexes */
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#define EXT2_XATTR_INDEX_USER 1
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#define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS 2
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#define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT 3
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#define EXT2_XATTR_INDEX_TRUSTED 4
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#define EXT2_XATTR_INDEX_LUSTRE 5
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#define EXT2_XATTR_INDEX_SECURITY 6
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struct ext2_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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__u32 h_reserved[4]; /* zero right now */
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};
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struct ext2_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 EXT2_XATTR_PAD_BITS 2
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#define EXT2_XATTR_PAD (1<<EXT2_XATTR_PAD_BITS)
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#define EXT2_XATTR_ROUND (EXT2_XATTR_PAD-1)
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#define EXT2_XATTR_LEN(name_len) \
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(((name_len) + EXT2_XATTR_ROUND + \
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sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND)
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#define EXT2_XATTR_NEXT(entry) \
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( (struct ext2_xattr_entry *)( \
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(char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) )
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#define EXT2_XATTR_SIZE(size) \
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(((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND)
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struct mb2_cache;
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# ifdef CONFIG_EXT2_FS_XATTR
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extern const struct xattr_handler ext2_xattr_user_handler;
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extern const struct xattr_handler ext2_xattr_trusted_handler;
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extern const struct xattr_handler ext2_xattr_security_handler;
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extern ssize_t ext2_listxattr(struct dentry *, char *, size_t);
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extern int ext2_xattr_get(struct inode *, int, const char *, void *, size_t);
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extern int ext2_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
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extern void ext2_xattr_delete_inode(struct inode *);
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extern struct mb2_cache *ext2_xattr_create_cache(void);
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extern void ext2_xattr_destroy_cache(struct mb2_cache *cache);
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extern const struct xattr_handler *ext2_xattr_handlers[];
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# else /* CONFIG_EXT2_FS_XATTR */
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static inline int
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ext2_xattr_get(struct inode *inode, int name_index,
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const char *name, void *buffer, size_t size)
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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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ext2_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 void
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ext2_xattr_delete_inode(struct inode *inode)
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{
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}
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static inline void ext2_xattr_destroy_cache(struct mb2_cache *cache)
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{
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}
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#define ext2_xattr_handlers NULL
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# endif /* CONFIG_EXT2_FS_XATTR */
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#ifdef CONFIG_EXT2_FS_SECURITY
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extern int ext2_init_security(struct inode *inode, struct inode *dir,
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const struct qstr *qstr);
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#else
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static inline int ext2_init_security(struct inode *inode, struct inode *dir,
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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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