2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License v.2.
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <asm/semaphore.h>
28 /* This doesn't need to be that large as max 64 bit pointers in a 4k
29 * block is 512, so __u16 is fine for that. It saves stack space to
33 __u16 mp_list
[GFS2_MAX_META_HEIGHT
];
36 typedef int (*block_call_t
) (struct gfs2_inode
*ip
, struct buffer_head
*dibh
,
37 struct buffer_head
*bh
, uint64_t *top
,
38 uint64_t *bottom
, unsigned int height
,
43 unsigned int sm_height
;
47 * @gfs2_unstuffer_sync - Synchronously unstuff a dinode
53 * Cheat and use a metadata buffer instead of a data page.
58 int gfs2_unstuffer_sync(struct gfs2_inode
*ip
, struct buffer_head
*dibh
,
59 uint64_t block
, void *private)
61 struct buffer_head
*bh
;
64 bh
= gfs2_meta_new(ip
->i_gl
, block
);
66 gfs2_buffer_copy_tail(bh
, 0, dibh
, sizeof(struct gfs2_dinode
));
69 error
= sync_dirty_buffer(bh
);
77 * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
78 * @ip: The GFS2 inode to unstuff
79 * @unstuffer: the routine that handles unstuffing a non-zero length file
80 * @private: private data for the unstuffer
82 * This routine unstuffs a dinode and returns it to a "normal" state such
83 * that the height can be grown in the traditional way.
88 int gfs2_unstuff_dinode(struct gfs2_inode
*ip
, gfs2_unstuffer_t unstuffer
,
91 struct buffer_head
*bh
, *dibh
;
93 int journaled
= gfs2_is_jdata(ip
);
96 down_write(&ip
->i_rw_mutex
);
98 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
102 if (ip
->i_di
.di_size
) {
103 /* Get a free block, fill it with the stuffed data,
104 and write it out to disk */
107 block
= gfs2_alloc_meta(ip
);
109 error
= gfs2_jdata_get_buffer(ip
, block
, 1, &bh
);
112 gfs2_buffer_copy_tail(bh
,
113 sizeof(struct gfs2_meta_header
),
114 dibh
, sizeof(struct gfs2_dinode
));
117 block
= gfs2_alloc_data(ip
);
119 error
= unstuffer(ip
, dibh
, block
, private);
125 /* Set up the pointer to the new block */
127 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
129 gfs2_buffer_clear_tail(dibh
, sizeof(struct gfs2_dinode
));
131 if (ip
->i_di
.di_size
) {
132 *(uint64_t *)(dibh
->b_data
+ sizeof(struct gfs2_dinode
)) = cpu_to_be64(block
);
133 ip
->i_di
.di_blocks
++;
136 ip
->i_di
.di_height
= 1;
138 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
144 up_write(&ip
->i_rw_mutex
);
150 * calc_tree_height - Calculate the height of a metadata tree
151 * @ip: The GFS2 inode
152 * @size: The proposed size of the file
154 * Work out how tall a metadata tree needs to be in order to accommodate a
155 * file of a particular size. If size is less than the current size of
156 * the inode, then the current size of the inode is used instead of the
159 * Returns: the height the tree should be
162 static unsigned int calc_tree_height(struct gfs2_inode
*ip
, uint64_t size
)
164 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
166 unsigned int max
, height
;
168 if (ip
->i_di
.di_size
> size
)
169 size
= ip
->i_di
.di_size
;
171 if (gfs2_is_jdata(ip
)) {
172 arr
= sdp
->sd_jheightsize
;
173 max
= sdp
->sd_max_jheight
;
175 arr
= sdp
->sd_heightsize
;
176 max
= sdp
->sd_max_height
;
179 for (height
= 0; height
< max
; height
++)
180 if (arr
[height
] >= size
)
187 * build_height - Build a metadata tree of the requested height
188 * @ip: The GFS2 inode
189 * @height: The height to build to
191 * This routine makes sure that the metadata tree is tall enough to hold
192 * "size" bytes of data.
197 static int build_height(struct gfs2_inode
*ip
, int height
)
199 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
200 struct buffer_head
*bh
, *dibh
;
201 uint64_t block
= 0, *bp
;
206 while (ip
->i_di
.di_height
< height
) {
207 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
212 bp
= (uint64_t *)(dibh
->b_data
+ sizeof(struct gfs2_dinode
));
213 for (x
= 0; x
< sdp
->sd_diptrs
; x
++, bp
++)
220 /* Get a new block, fill it with the old direct
221 pointers, and write it out */
223 block
= gfs2_alloc_meta(ip
);
225 bh
= gfs2_meta_new(ip
->i_gl
, block
);
226 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
227 gfs2_metatype_set(bh
,
230 gfs2_buffer_copy_tail(bh
,
231 sizeof(struct gfs2_meta_header
),
232 dibh
, sizeof(struct gfs2_dinode
));
237 /* Set up the new direct pointer and write it out to disk */
239 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
241 gfs2_buffer_clear_tail(dibh
, sizeof(struct gfs2_dinode
));
244 *(uint64_t *)(dibh
->b_data
+ sizeof(struct gfs2_dinode
)) = cpu_to_be64(block
);
245 ip
->i_di
.di_blocks
++;
248 ip
->i_di
.di_height
++;
250 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
258 * find_metapath - Find path through the metadata tree
259 * @ip: The inode pointer
260 * @mp: The metapath to return the result in
261 * @block: The disk block to look up
263 * This routine returns a struct metapath structure that defines a path
264 * through the metadata of inode "ip" to get to block "block".
267 * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a
268 * filesystem with a blocksize of 4096.
270 * find_metapath() would return a struct metapath structure set to:
271 * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48,
272 * and mp_list[2] = 165.
274 * That means that in order to get to the block containing the byte at
275 * offset 101342453, we would load the indirect block pointed to by pointer
276 * 0 in the dinode. We would then load the indirect block pointed to by
277 * pointer 48 in that indirect block. We would then load the data block
278 * pointed to by pointer 165 in that indirect block.
280 * ----------------------------------------
285 * ----------------------------------------
289 * ----------------------------------------
293 * |0 5 6 7 8 9 0 1 2|
294 * ----------------------------------------
298 * ----------------------------------------
303 * ----------------------------------------
307 * ----------------------------------------
308 * | Data block containing offset |
312 * ----------------------------------------
316 static void find_metapath(struct gfs2_inode
*ip
, uint64_t block
, struct metapath
*mp
)
318 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
322 for (i
= ip
->i_di
.di_height
; i
--;)
323 mp
->mp_list
[i
] = (__u16
)do_div(b
, sdp
->sd_inptrs
);
328 * metapointer - Return pointer to start of metadata in a buffer
330 * @height: The metadata height (0 = dinode)
333 * Return a pointer to the block number of the next height of the metadata
334 * tree given a buffer containing the pointer to the current height of the
338 static inline uint64_t *metapointer(struct buffer_head
*bh
,
339 unsigned int height
, struct metapath
*mp
)
341 unsigned int head_size
= (height
> 0) ?
342 sizeof(struct gfs2_meta_header
) : sizeof(struct gfs2_dinode
);
344 return ((uint64_t *)(bh
->b_data
+ head_size
)) + mp
->mp_list
[height
];
348 * lookup_block - Get the next metadata block in metadata tree
349 * @ip: The GFS2 inode
350 * @bh: Buffer containing the pointers to metadata blocks
351 * @height: The height of the tree (0 = dinode)
353 * @create: Non-zero if we may create a new meatdata block
354 * @new: Used to indicate if we did create a new metadata block
355 * @block: the returned disk block number
357 * Given a metatree, complete to a particular height, checks to see if the next
358 * height of the tree exists. If not the next height of the tree is created.
359 * The block number of the next height of the metadata tree is returned.
363 static void lookup_block(struct gfs2_inode
*ip
, struct buffer_head
*bh
,
364 unsigned int height
, struct metapath
*mp
, int create
,
365 int *new, uint64_t *block
)
367 uint64_t *ptr
= metapointer(bh
, height
, mp
);
370 *block
= be64_to_cpu(*ptr
);
379 if (height
== ip
->i_di
.di_height
- 1 &&
381 *block
= gfs2_alloc_data(ip
);
383 *block
= gfs2_alloc_meta(ip
);
385 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
387 *ptr
= cpu_to_be64(*block
);
388 ip
->i_di
.di_blocks
++;
394 * gfs2_block_map - Map a block from an inode to a disk block
395 * @ip: The GFS2 inode
396 * @lblock: The logical block number
397 * @new: Value/Result argument (1 = may create/did create new blocks)
398 * @dblock: the disk block number of the start of an extent
399 * @extlen: the size of the extent
401 * Find the block number on the current device which corresponds to an
402 * inode's block. If the block had to be created, "new" will be set.
407 int gfs2_block_map(struct gfs2_inode
*ip
, uint64_t lblock
, int *new,
408 uint64_t *dblock
, uint32_t *extlen
)
410 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
411 struct buffer_head
*bh
;
416 unsigned int end_of_metadata
;
426 down_write(&ip
->i_rw_mutex
);
428 down_read(&ip
->i_rw_mutex
);
430 if (gfs2_assert_warn(sdp
, !gfs2_is_stuffed(ip
)))
433 bsize
= (gfs2_is_jdata(ip
)) ? sdp
->sd_jbsize
: sdp
->sd_sb
.sb_bsize
;
435 height
= calc_tree_height(ip
, (lblock
+ 1) * bsize
);
436 if (ip
->i_di
.di_height
< height
) {
440 error
= build_height(ip
, height
);
445 find_metapath(ip
, lblock
, &mp
);
446 end_of_metadata
= ip
->i_di
.di_height
- 1;
448 error
= gfs2_meta_inode_buffer(ip
, &bh
);
452 for (x
= 0; x
< end_of_metadata
; x
++) {
453 lookup_block(ip
, bh
, x
, &mp
, create
, new, dblock
);
458 error
= gfs2_meta_indirect_buffer(ip
, x
+1, *dblock
, *new, &bh
);
463 lookup_block(ip
, bh
, end_of_metadata
, &mp
, create
, new, dblock
);
465 if (extlen
&& *dblock
) {
473 nptrs
= (end_of_metadata
) ? sdp
->sd_inptrs
:
476 while (++mp
.mp_list
[end_of_metadata
] < nptrs
) {
477 lookup_block(ip
, bh
, end_of_metadata
, &mp
,
478 0, &tmp_new
, &tmp_dblock
);
480 if (*dblock
+ *extlen
!= tmp_dblock
)
491 error
= gfs2_meta_inode_buffer(ip
, &bh
);
493 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
494 gfs2_dinode_out(&ip
->i_di
, bh
->b_data
);
501 up_write(&ip
->i_rw_mutex
);
503 up_read(&ip
->i_rw_mutex
);
509 * recursive_scan - recursively scan through the end of a file
511 * @dibh: the dinode buffer
512 * @mp: the path through the metadata to the point to start
513 * @height: the height the recursion is at
514 * @block: the indirect block to look at
515 * @first: 1 if this is the first block
516 * @bc: the call to make for each piece of metadata
517 * @data: data opaque to this function to pass to @bc
519 * When this is first called @height and @block should be zero and
520 * @first should be 1.
525 static int recursive_scan(struct gfs2_inode
*ip
, struct buffer_head
*dibh
,
526 struct metapath
*mp
, unsigned int height
,
527 uint64_t block
, int first
, block_call_t bc
,
530 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
531 struct buffer_head
*bh
= NULL
;
532 uint64_t *top
, *bottom
;
535 int mh_size
= sizeof(struct gfs2_meta_header
);
538 error
= gfs2_meta_inode_buffer(ip
, &bh
);
543 top
= (uint64_t *)(bh
->b_data
+ sizeof(struct gfs2_dinode
)) +
545 bottom
= (uint64_t *)(bh
->b_data
+ sizeof(struct gfs2_dinode
)) +
548 error
= gfs2_meta_indirect_buffer(ip
, height
, block
, 0, &bh
);
552 top
= (uint64_t *)(bh
->b_data
+ mh_size
) +
553 ((first
) ? mp
->mp_list
[height
] : 0);
555 bottom
= (uint64_t *)(bh
->b_data
+ mh_size
) + sdp
->sd_inptrs
;
558 error
= bc(ip
, dibh
, bh
, top
, bottom
, height
, data
);
562 if (height
< ip
->i_di
.di_height
- 1)
563 for (; top
< bottom
; top
++, first
= 0) {
567 bn
= be64_to_cpu(*top
);
569 error
= recursive_scan(ip
, dibh
, mp
, height
+ 1, bn
,
582 * do_strip - Look for a layer a particular layer of the file and strip it off
584 * @dibh: the dinode buffer
585 * @bh: A buffer of pointers
586 * @top: The first pointer in the buffer
587 * @bottom: One more than the last pointer
588 * @height: the height this buffer is at
589 * @data: a pointer to a struct strip_mine
594 static int do_strip(struct gfs2_inode
*ip
, struct buffer_head
*dibh
,
595 struct buffer_head
*bh
, uint64_t *top
, uint64_t *bottom
,
596 unsigned int height
, void *data
)
598 struct strip_mine
*sm
= (struct strip_mine
*)data
;
599 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
600 struct gfs2_rgrp_list rlist
;
604 unsigned int rg_blocks
= 0;
606 unsigned int revokes
= 0;
613 if (height
!= sm
->sm_height
)
621 metadata
= (height
!= ip
->i_di
.di_height
- 1) || gfs2_is_jdata(ip
);
623 revokes
= (height
) ? sdp
->sd_inptrs
: sdp
->sd_diptrs
;
625 error
= gfs2_rindex_hold(sdp
, &ip
->i_alloc
.al_ri_gh
);
629 memset(&rlist
, 0, sizeof(struct gfs2_rgrp_list
));
633 for (p
= top
; p
< bottom
; p
++) {
637 bn
= be64_to_cpu(*p
);
639 if (bstart
+ blen
== bn
)
643 gfs2_rlist_add(sdp
, &rlist
, bstart
);
651 gfs2_rlist_add(sdp
, &rlist
, bstart
);
653 goto out
; /* Nothing to do */
655 gfs2_rlist_alloc(&rlist
, LM_ST_EXCLUSIVE
, 0);
657 for (x
= 0; x
< rlist
.rl_rgrps
; x
++) {
658 struct gfs2_rgrpd
*rgd
;
659 rgd
= get_gl2rgd(rlist
.rl_ghs
[x
].gh_gl
);
660 rg_blocks
+= rgd
->rd_ri
.ri_length
;
663 error
= gfs2_glock_nq_m(rlist
.rl_rgrps
, rlist
.rl_ghs
);
667 error
= gfs2_trans_begin(sdp
, rg_blocks
+ RES_DINODE
+
668 RES_INDIRECT
+ RES_STATFS
+ RES_QUOTA
,
673 down_write(&ip
->i_rw_mutex
);
675 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
676 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
681 for (p
= top
; p
< bottom
; p
++) {
685 bn
= be64_to_cpu(*p
);
687 if (bstart
+ blen
== bn
)
692 gfs2_free_meta(ip
, bstart
, blen
);
694 gfs2_free_data(ip
, bstart
, blen
);
702 if (!ip
->i_di
.di_blocks
)
703 gfs2_consist_inode(ip
);
704 ip
->i_di
.di_blocks
--;
708 gfs2_free_meta(ip
, bstart
, blen
);
710 gfs2_free_data(ip
, bstart
, blen
);
713 ip
->i_di
.di_mtime
= ip
->i_di
.di_ctime
= get_seconds();
715 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
717 up_write(&ip
->i_rw_mutex
);
722 gfs2_glock_dq_m(rlist
.rl_rgrps
, rlist
.rl_ghs
);
725 gfs2_rlist_free(&rlist
);
728 gfs2_glock_dq_uninit(&ip
->i_alloc
.al_ri_gh
);
734 * do_grow - Make a file look bigger than it is
736 * @size: the size to set the file to
738 * Called with an exclusive lock on @ip.
743 static int do_grow(struct gfs2_inode
*ip
, uint64_t size
)
745 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
746 struct gfs2_alloc
*al
;
747 struct buffer_head
*dibh
;
751 al
= gfs2_alloc_get(ip
);
753 error
= gfs2_quota_lock(ip
, NO_QUOTA_CHANGE
, NO_QUOTA_CHANGE
);
757 error
= gfs2_quota_check(ip
, ip
->i_di
.di_uid
, ip
->i_di
.di_gid
);
761 al
->al_requested
= sdp
->sd_max_height
+ RES_DATA
;
763 error
= gfs2_inplace_reserve(ip
);
767 error
= gfs2_trans_begin(sdp
,
768 sdp
->sd_max_height
+ al
->al_rgd
->rd_ri
.ri_length
+
769 RES_JDATA
+ RES_DINODE
+ RES_STATFS
+ RES_QUOTA
, 0);
773 if (size
> sdp
->sd_sb
.sb_bsize
- sizeof(struct gfs2_dinode
)) {
774 if (gfs2_is_stuffed(ip
)) {
775 error
= gfs2_unstuff_dinode(ip
, gfs2_unstuffer_page
,
781 h
= calc_tree_height(ip
, size
);
782 if (ip
->i_di
.di_height
< h
) {
783 down_write(&ip
->i_rw_mutex
);
784 error
= build_height(ip
, h
);
785 up_write(&ip
->i_rw_mutex
);
791 ip
->i_di
.di_size
= size
;
792 ip
->i_di
.di_mtime
= ip
->i_di
.di_ctime
= get_seconds();
794 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
798 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
799 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
806 gfs2_inplace_release(ip
);
809 gfs2_quota_unlock(ip
);
817 static int truncator_journaled(struct gfs2_inode
*ip
, uint64_t size
)
821 struct buffer_head
*bh
;
826 off
= do_div(lbn
, ip
->i_sbd
->sd_jbsize
);
828 error
= gfs2_block_map(ip
, lbn
, &new, &dbn
, NULL
);
832 error
= gfs2_jdata_get_buffer(ip
, dbn
, 0, &bh
);
836 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
837 gfs2_buffer_clear_tail(bh
, sizeof(struct gfs2_meta_header
) + off
);
844 static int trunc_start(struct gfs2_inode
*ip
, uint64_t size
,
845 gfs2_truncator_t truncator
)
847 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
848 struct buffer_head
*dibh
;
849 int journaled
= gfs2_is_jdata(ip
);
852 error
= gfs2_trans_begin(sdp
,
853 RES_DINODE
+ ((journaled
) ? RES_JDATA
: 0), 0);
857 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
861 if (gfs2_is_stuffed(ip
)) {
862 ip
->i_di
.di_size
= size
;
863 ip
->i_di
.di_mtime
= ip
->i_di
.di_ctime
= get_seconds();
864 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
865 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
866 gfs2_buffer_clear_tail(dibh
, sizeof(struct gfs2_dinode
) + size
);
871 uint64_t junk
= size
;
872 /* we're just interested in the modulus */
873 if (do_div(junk
, sdp
->sd_jbsize
))
874 error
= truncator_journaled(ip
, size
);
875 } else if (size
& (uint64_t)(sdp
->sd_sb
.sb_bsize
- 1))
876 error
= truncator(ip
, size
);
879 ip
->i_di
.di_size
= size
;
880 ip
->i_di
.di_mtime
= ip
->i_di
.di_ctime
= get_seconds();
881 ip
->i_di
.di_flags
|= GFS2_DIF_TRUNC_IN_PROG
;
882 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
883 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
895 static int trunc_dealloc(struct gfs2_inode
*ip
, uint64_t size
)
897 unsigned int height
= ip
->i_di
.di_height
;
904 else if (gfs2_is_jdata(ip
)) {
906 do_div(lblock
, ip
->i_sbd
->sd_jbsize
);
908 lblock
= (size
- 1) >> ip
->i_sbd
->sd_sb
.sb_bsize_shift
;
910 find_metapath(ip
, lblock
, &mp
);
913 error
= gfs2_quota_hold(ip
, NO_QUOTA_CHANGE
, NO_QUOTA_CHANGE
);
918 struct strip_mine sm
;
919 sm
.sm_first
= !!size
;
920 sm
.sm_height
= height
;
922 error
= recursive_scan(ip
, NULL
, &mp
, 0, 0, 1, do_strip
, &sm
);
927 gfs2_quota_unhold(ip
);
934 static int trunc_end(struct gfs2_inode
*ip
)
936 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
937 struct buffer_head
*dibh
;
940 error
= gfs2_trans_begin(sdp
, RES_DINODE
, 0);
944 down_write(&ip
->i_rw_mutex
);
946 error
= gfs2_meta_inode_buffer(ip
, &dibh
);
950 if (!ip
->i_di
.di_size
) {
951 ip
->i_di
.di_height
= 0;
952 ip
->i_di
.di_goal_meta
=
953 ip
->i_di
.di_goal_data
=
955 gfs2_buffer_clear_tail(dibh
, sizeof(struct gfs2_dinode
));
957 ip
->i_di
.di_mtime
= ip
->i_di
.di_ctime
= get_seconds();
958 ip
->i_di
.di_flags
&= ~GFS2_DIF_TRUNC_IN_PROG
;
960 gfs2_trans_add_bh(ip
->i_gl
, dibh
, 1);
961 gfs2_dinode_out(&ip
->i_di
, dibh
->b_data
);
965 up_write(&ip
->i_rw_mutex
);
973 * do_shrink - make a file smaller
975 * @size: the size to make the file
976 * @truncator: function to truncate the last partial block
978 * Called with an exclusive lock on @ip.
983 static int do_shrink(struct gfs2_inode
*ip
, uint64_t size
,
984 gfs2_truncator_t truncator
)
988 error
= trunc_start(ip
, size
, truncator
);
994 error
= trunc_dealloc(ip
, size
);
996 error
= trunc_end(ip
);
1002 * gfs2_truncatei - make a file a given size
1004 * @size: the size to make the file
1005 * @truncator: function to truncate the last partial block
1007 * The file size can grow, shrink, or stay the same size.
1012 int gfs2_truncatei(struct gfs2_inode
*ip
, uint64_t size
,
1013 gfs2_truncator_t truncator
)
1017 if (gfs2_assert_warn(ip
->i_sbd
, S_ISREG(ip
->i_di
.di_mode
)))
1020 if (size
> ip
->i_di
.di_size
)
1021 error
= do_grow(ip
, size
);
1023 error
= do_shrink(ip
, size
, truncator
);
1028 int gfs2_truncatei_resume(struct gfs2_inode
*ip
)
1031 error
= trunc_dealloc(ip
, ip
->i_di
.di_size
);
1033 error
= trunc_end(ip
);
1037 int gfs2_file_dealloc(struct gfs2_inode
*ip
)
1039 return trunc_dealloc(ip
, 0);
1043 * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file
1045 * @len: the number of bytes to be written to the file
1046 * @data_blocks: returns the number of data blocks required
1047 * @ind_blocks: returns the number of indirect blocks required
1051 void gfs2_write_calc_reserv(struct gfs2_inode
*ip
, unsigned int len
,
1052 unsigned int *data_blocks
, unsigned int *ind_blocks
)
1054 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
1057 if (gfs2_is_jdata(ip
)) {
1058 *data_blocks
= DIV_RU(len
, sdp
->sd_jbsize
) + 2;
1059 *ind_blocks
= 3 * (sdp
->sd_max_jheight
- 1);
1061 *data_blocks
= (len
>> sdp
->sd_sb
.sb_bsize_shift
) + 3;
1062 *ind_blocks
= 3 * (sdp
->sd_max_height
- 1);
1065 for (tmp
= *data_blocks
; tmp
> sdp
->sd_diptrs
;) {
1066 tmp
= DIV_RU(tmp
, sdp
->sd_inptrs
);
1072 * gfs2_write_alloc_required - figure out if a write will require an allocation
1073 * @ip: the file being written to
1074 * @offset: the offset to write to
1075 * @len: the number of bytes being written
1076 * @alloc_required: set to 1 if an alloc is required, 0 otherwise
1081 int gfs2_write_alloc_required(struct gfs2_inode
*ip
, uint64_t offset
,
1082 unsigned int len
, int *alloc_required
)
1084 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
1085 uint64_t lblock
, lblock_stop
, dblock
;
1090 *alloc_required
= 0;
1095 if (gfs2_is_stuffed(ip
)) {
1097 sdp
->sd_sb
.sb_bsize
- sizeof(struct gfs2_dinode
))
1098 *alloc_required
= 1;
1102 if (gfs2_is_jdata(ip
)) {
1103 unsigned int bsize
= sdp
->sd_jbsize
;
1105 do_div(lblock
, bsize
);
1106 lblock_stop
= offset
+ len
+ bsize
- 1;
1107 do_div(lblock_stop
, bsize
);
1109 unsigned int shift
= sdp
->sd_sb
.sb_bsize_shift
;
1110 lblock
= offset
>> shift
;
1111 lblock_stop
= (offset
+ len
+ sdp
->sd_sb
.sb_bsize
- 1) >> shift
;
1114 for (; lblock
< lblock_stop
; lblock
+= extlen
) {
1115 error
= gfs2_block_map(ip
, lblock
, &new, &dblock
, &extlen
);
1120 *alloc_required
= 1;