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Diffstat (limited to 'fs/xfs/libxfs/xfs_inode_fork.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_inode_fork.h | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h new file mode 100644 index 000000000000..7d3b1ed6dcbe --- /dev/null +++ b/fs/xfs/libxfs/xfs_inode_fork.h @@ -0,0 +1,171 @@ +/* + * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#ifndef __XFS_INODE_FORK_H__ +#define __XFS_INODE_FORK_H__ + +struct xfs_inode_log_item; +struct xfs_dinode; + +/* + * 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_host_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_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 */ + struct xfs_btree_block *if_broot; /* file's incore btree root */ + short if_broot_bytes; /* bytes allocated for root */ + unsigned char if_flags; /* per-fork flags */ + union { + xfs_bmbt_rec_host_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 { + xfs_bmbt_rec_host_t if_inline_ext[XFS_INLINE_EXTS]; + /* very small file extents */ + char if_inline_data[XFS_INLINE_DATA]; + /* very small file data */ + xfs_dev_t if_rdev; /* dev number if special */ + uuid_t if_uuid; /* mount point value */ + } if_u2; +} xfs_ifork_t; + +/* + * Per-fork incore inode flags. + */ +#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 */ + +/* + * Fork handling. + */ + +#define XFS_IFORK_Q(ip) ((ip)->i_d.di_forkoff != 0) +#define XFS_IFORK_BOFF(ip) ((int)((ip)->i_d.di_forkoff << 3)) + +#define XFS_IFORK_PTR(ip,w) \ + ((w) == XFS_DATA_FORK ? \ + &(ip)->i_df : \ + (ip)->i_afp) +#define XFS_IFORK_DSIZE(ip) \ + (XFS_IFORK_Q(ip) ? \ + XFS_IFORK_BOFF(ip) : \ + XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version)) +#define XFS_IFORK_ASIZE(ip) \ + (XFS_IFORK_Q(ip) ? \ + XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version) - \ + XFS_IFORK_BOFF(ip) : \ + 0) +#define XFS_IFORK_SIZE(ip,w) \ + ((w) == XFS_DATA_FORK ? \ + XFS_IFORK_DSIZE(ip) : \ + XFS_IFORK_ASIZE(ip)) +#define XFS_IFORK_FORMAT(ip,w) \ + ((w) == XFS_DATA_FORK ? \ + (ip)->i_d.di_format : \ + (ip)->i_d.di_aformat) +#define XFS_IFORK_FMT_SET(ip,w,n) \ + ((w) == XFS_DATA_FORK ? \ + ((ip)->i_d.di_format = (n)) : \ + ((ip)->i_d.di_aformat = (n))) +#define XFS_IFORK_NEXTENTS(ip,w) \ + ((w) == XFS_DATA_FORK ? \ + (ip)->i_d.di_nextents : \ + (ip)->i_d.di_anextents) +#define XFS_IFORK_NEXT_SET(ip,w,n) \ + ((w) == XFS_DATA_FORK ? \ + ((ip)->i_d.di_nextents = (n)) : \ + ((ip)->i_d.di_anextents = (n))) +#define XFS_IFORK_MAXEXT(ip, w) \ + (XFS_IFORK_SIZE(ip, w) / sizeof(xfs_bmbt_rec_t)) + +int xfs_iformat_fork(struct xfs_inode *, struct xfs_dinode *); +void xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *, + struct xfs_inode_log_item *, int); +void xfs_idestroy_fork(struct xfs_inode *, int); +void xfs_idata_realloc(struct xfs_inode *, int, int); +void xfs_iroot_realloc(struct xfs_inode *, int, int); +int xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int); +int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *, + int); + +struct xfs_bmbt_rec_host * + xfs_iext_get_ext(struct xfs_ifork *, xfs_extnum_t); +void xfs_iext_insert(struct xfs_inode *, xfs_extnum_t, xfs_extnum_t, + struct xfs_bmbt_irec *, int); +void xfs_iext_add(struct xfs_ifork *, xfs_extnum_t, int); +void xfs_iext_add_indirect_multi(struct xfs_ifork *, int, + xfs_extnum_t, int); +void xfs_iext_remove(struct xfs_inode *, xfs_extnum_t, int, int); +void xfs_iext_remove_inline(struct xfs_ifork *, xfs_extnum_t, int); +void xfs_iext_remove_direct(struct xfs_ifork *, xfs_extnum_t, int); +void xfs_iext_remove_indirect(struct xfs_ifork *, xfs_extnum_t, int); +void xfs_iext_realloc_direct(struct xfs_ifork *, int); +void xfs_iext_direct_to_inline(struct xfs_ifork *, xfs_extnum_t); +void xfs_iext_inline_to_direct(struct xfs_ifork *, int); +void xfs_iext_destroy(struct xfs_ifork *); +struct xfs_bmbt_rec_host * + xfs_iext_bno_to_ext(struct xfs_ifork *, xfs_fileoff_t, int *); +struct xfs_ext_irec * + xfs_iext_bno_to_irec(struct xfs_ifork *, xfs_fileoff_t, int *); +struct xfs_ext_irec * + xfs_iext_idx_to_irec(struct xfs_ifork *, xfs_extnum_t *, int *, + int); +void xfs_iext_irec_init(struct xfs_ifork *); +struct xfs_ext_irec * + xfs_iext_irec_new(struct xfs_ifork *, int); +void xfs_iext_irec_remove(struct xfs_ifork *, int); +void xfs_iext_irec_compact(struct xfs_ifork *); +void xfs_iext_irec_compact_pages(struct xfs_ifork *); +void xfs_iext_irec_compact_full(struct xfs_ifork *); +void xfs_iext_irec_update_extoffs(struct xfs_ifork *, int, int); + +extern struct kmem_zone *xfs_ifork_zone; + +#endif /* __XFS_INODE_FORK_H__ */ |