#define XFS_DATA_FORK 0
#define XFS_ATTR_FORK 1
+/*
+ * The following xfs_ext_irec_t struct introduces a second (top) level
+ * to the in-core extent allocation scheme. These structs are allocated
+ * in a contiguous block, creating an indirection array where each entry
+ * (irec) contains a pointer to a buffer of in-core extent records which
+ * it manages. Each extent buffer is 4k in size, since 4k is the system
+ * page size on Linux i386 and systems with larger page sizes don't seem
+ * to gain much, if anything, by using their native page size as the
+ * extent buffer size. Also, using 4k extent buffers everywhere provides
+ * a consistent interface for CXFS across different platforms.
+ *
+ * There is currently no limit on the number of irec's (extent lists)
+ * allowed, so heavily fragmented files may require an indirection array
+ * which spans multiple system pages of memory. The number of extents
+ * which would require this amount of contiguous memory is very large
+ * and should not cause problems in the foreseeable future. However,
+ * if the memory needed for the contiguous array ever becomes a problem,
+ * it is possible that a third level of indirection may be required.
+ */
+typedef struct xfs_ext_irec {
+ xfs_bmbt_rec_t *er_extbuf; /* block of extent records */
+ xfs_extnum_t er_extoff; /* extent offset in file */
+ xfs_extnum_t er_extcount; /* number of extents in page/block */
+} xfs_ext_irec_t;
+
/*
* File incore extent information, present for each of data & attr forks.
*/
-#define XFS_INLINE_EXTS 2
-#define XFS_INLINE_DATA 32
+#define XFS_IEXT_BUFSZ 4096
+#define XFS_LINEAR_EXTS (XFS_IEXT_BUFSZ / (uint)sizeof(xfs_bmbt_rec_t))
+#define XFS_INLINE_EXTS 2
+#define XFS_INLINE_DATA 32
typedef struct xfs_ifork {
int if_bytes; /* bytes in if_u1 */
int if_real_bytes; /* bytes allocated in if_u1 */
xfs_extnum_t if_lastex; /* last if_extents used */
union {
xfs_bmbt_rec_t *if_extents; /* linear map file exts */
+ xfs_ext_irec_t *if_ext_irec; /* irec map file exts */
char *if_data; /* inline file data */
} if_u1;
union {
/*
* Per-fork incore inode flags.
*/
-#define XFS_IFINLINE 0x0001 /* Inline data is read in */
-#define XFS_IFEXTENTS 0x0002 /* All extent pointers are read in */
-#define XFS_IFBROOT 0x0004 /* i_broot points to the bmap b-tree root */
+#define XFS_IFINLINE 0x01 /* Inline data is read in */
+#define XFS_IFEXTENTS 0x02 /* All extent pointers are read in */
+#define XFS_IFBROOT 0x04 /* i_broot points to the bmap b-tree root */
+#define XFS_IFEXTIREC 0x08 /* Indirection array of extent blocks */
/*
- * Flags for xfs_imap() and xfs_dilocate().
+ * Flags for xfs_itobp(), xfs_imap() and xfs_dilocate().
*/
-#define XFS_IMAP_LOOKUP 0x1
-
-/*
- * Maximum number of extent pointers in if_u1.if_extents.
- */
-#define XFS_MAX_INCORE_EXTENTS 32768
-
+#define XFS_IMAP_LOOKUP 0x1
+#define XFS_IMAP_BULKSTAT 0x2
#ifdef __KERNEL__
struct bhv_desc;
*/
typedef struct xfs_chashlist {
struct xfs_chashlist *chl_next;
+ struct xfs_chashlist *chl_prev;
struct xfs_inode *chl_ip;
xfs_daddr_t chl_blkno; /* starting block number of
* the cluster */
*/
int xfs_itobp(struct xfs_mount *, struct xfs_trans *,
xfs_inode_t *, xfs_dinode_t **, struct xfs_buf **,
- xfs_daddr_t);
+ xfs_daddr_t, uint);
int xfs_iread(struct xfs_mount *, struct xfs_trans *, xfs_ino_t,
xfs_inode_t **, xfs_daddr_t);
int xfs_iread_extents(struct xfs_trans *, xfs_inode_t *, int);
xfs_fsize_t xfs_file_last_byte(xfs_inode_t *);
void xfs_lock_inodes(xfs_inode_t **, int, int, uint);
+xfs_inode_t *xfs_vtoi(struct vnode *vp);
+
+void xfs_synchronize_atime(xfs_inode_t *);
+
+xfs_bmbt_rec_t *xfs_iext_get_ext(xfs_ifork_t *, xfs_extnum_t);
+void xfs_iext_insert(xfs_ifork_t *, xfs_extnum_t, xfs_extnum_t,
+ xfs_bmbt_irec_t *);
+void xfs_iext_add(xfs_ifork_t *, xfs_extnum_t, int);
+void xfs_iext_add_indirect_multi(xfs_ifork_t *, int, xfs_extnum_t, int);
+void xfs_iext_remove(xfs_ifork_t *, xfs_extnum_t, int);
+void xfs_iext_remove_inline(xfs_ifork_t *, xfs_extnum_t, int);
+void xfs_iext_remove_direct(xfs_ifork_t *, xfs_extnum_t, int);
+void xfs_iext_remove_indirect(xfs_ifork_t *, xfs_extnum_t, int);
+void xfs_iext_realloc_direct(xfs_ifork_t *, int);
+void xfs_iext_realloc_indirect(xfs_ifork_t *, int);
+void xfs_iext_indirect_to_direct(xfs_ifork_t *);
+void xfs_iext_direct_to_inline(xfs_ifork_t *, xfs_extnum_t);
+void xfs_iext_inline_to_direct(xfs_ifork_t *, int);
+void xfs_iext_destroy(xfs_ifork_t *);
+xfs_bmbt_rec_t *xfs_iext_bno_to_ext(xfs_ifork_t *, xfs_fileoff_t, int *);
+xfs_ext_irec_t *xfs_iext_bno_to_irec(xfs_ifork_t *, xfs_fileoff_t, int *);
+xfs_ext_irec_t *xfs_iext_idx_to_irec(xfs_ifork_t *, xfs_extnum_t *, int *, int);
+void xfs_iext_irec_init(xfs_ifork_t *);
+xfs_ext_irec_t *xfs_iext_irec_new(xfs_ifork_t *, int);
+void xfs_iext_irec_remove(xfs_ifork_t *, int);
+void xfs_iext_irec_compact(xfs_ifork_t *);
+void xfs_iext_irec_compact_pages(xfs_ifork_t *);
+void xfs_iext_irec_compact_full(xfs_ifork_t *);
+void xfs_iext_irec_update_extoffs(xfs_ifork_t *, int, int);
+
#define xfs_ipincount(ip) ((unsigned int) atomic_read(&ip->i_pincount))
#ifdef DEBUG
git.openpandora.org / pandora-kernel.git / blobdiff