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 <linux/gfs2_ondisk.h>
16 #include <linux/crc32.h>
17 #include <asm/semaphore.h>
20 #include "lm_interface.h"
33 /* This doesn't need to be that large as max 64 bit pointers in a 4k
34 * block is 512, so __u16 is fine for that. It saves stack space to
38 __u16 mp_list[GFS2_MAX_META_HEIGHT];
41 typedef int (*block_call_t) (struct gfs2_inode *ip, struct buffer_head *dibh,
42 struct buffer_head *bh, uint64_t *top,
43 uint64_t *bottom, unsigned int height,
48 unsigned int sm_height;
52 * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
53 * @ip: The GFS2 inode to unstuff
54 * @unstuffer: the routine that handles unstuffing a non-zero length file
55 * @private: private data for the unstuffer
57 * This routine unstuffs a dinode and returns it to a "normal" state such
58 * that the height can be grown in the traditional way.
63 int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer,
66 struct buffer_head *bh, *dibh;
68 int isdir = gfs2_is_dir(ip);
71 down_write(&ip->i_rw_mutex);
73 error = gfs2_meta_inode_buffer(ip, &dibh);
77 if (ip->i_di.di_size) {
78 /* Get a free block, fill it with the stuffed data,
79 and write it out to disk */
82 block = gfs2_alloc_meta(ip);
84 error = gfs2_dir_get_new_buffer(ip, block, &bh);
87 gfs2_buffer_copy_tail(bh,
88 sizeof(struct gfs2_meta_header),
89 dibh, sizeof(struct gfs2_dinode));
92 block = gfs2_alloc_data(ip);
94 error = unstuffer(ip, dibh, block, private);
100 /* Set up the pointer to the new block */
102 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
104 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
106 if (ip->i_di.di_size) {
107 *(uint64_t *)(dibh->b_data + sizeof(struct gfs2_dinode)) =
109 ip->i_di.di_blocks++;
112 ip->i_di.di_height = 1;
114 gfs2_dinode_out(&ip->i_di, dibh->b_data);
120 up_write(&ip->i_rw_mutex);
126 * calc_tree_height - Calculate the height of a metadata tree
127 * @ip: The GFS2 inode
128 * @size: The proposed size of the file
130 * Work out how tall a metadata tree needs to be in order to accommodate a
131 * file of a particular size. If size is less than the current size of
132 * the inode, then the current size of the inode is used instead of the
135 * Returns: the height the tree should be
138 static unsigned int calc_tree_height(struct gfs2_inode *ip, uint64_t size)
140 struct gfs2_sbd *sdp = ip->i_sbd;
142 unsigned int max, height;
144 if (ip->i_di.di_size > size)
145 size = ip->i_di.di_size;
147 if (gfs2_is_dir(ip)) {
148 arr = sdp->sd_jheightsize;
149 max = sdp->sd_max_jheight;
151 arr = sdp->sd_heightsize;
152 max = sdp->sd_max_height;
155 for (height = 0; height < max; height++)
156 if (arr[height] >= size)
163 * build_height - Build a metadata tree of the requested height
164 * @ip: The GFS2 inode
165 * @height: The height to build to
167 * This routine makes sure that the metadata tree is tall enough to hold
168 * "size" bytes of data.
173 static int build_height(struct gfs2_inode *ip, int height)
175 struct gfs2_sbd *sdp = ip->i_sbd;
176 struct buffer_head *bh, *dibh;
177 uint64_t block = 0, *bp;
182 while (ip->i_di.di_height < height) {
183 error = gfs2_meta_inode_buffer(ip, &dibh);
188 bp = (uint64_t *)(dibh->b_data + sizeof(struct gfs2_dinode));
189 for (x = 0; x < sdp->sd_diptrs; x++, bp++)
196 /* Get a new block, fill it with the old direct
197 pointers, and write it out */
199 block = gfs2_alloc_meta(ip);
201 bh = gfs2_meta_new(ip->i_gl, block);
202 gfs2_trans_add_bh(ip->i_gl, bh, 1);
203 gfs2_metatype_set(bh,
206 gfs2_buffer_copy_tail(bh,
207 sizeof(struct gfs2_meta_header),
208 dibh, sizeof(struct gfs2_dinode));
213 /* Set up the new direct pointer and write it out to disk */
215 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
217 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
220 *(uint64_t *)(dibh->b_data +
221 sizeof(struct gfs2_dinode)) =
223 ip->i_di.di_blocks++;
226 ip->i_di.di_height++;
228 gfs2_dinode_out(&ip->i_di, dibh->b_data);
236 * find_metapath - Find path through the metadata tree
237 * @ip: The inode pointer
238 * @mp: The metapath to return the result in
239 * @block: The disk block to look up
241 * This routine returns a struct metapath structure that defines a path
242 * through the metadata of inode "ip" to get to block "block".
245 * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a
246 * filesystem with a blocksize of 4096.
248 * find_metapath() would return a struct metapath structure set to:
249 * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48,
250 * and mp_list[2] = 165.
252 * That means that in order to get to the block containing the byte at
253 * offset 101342453, we would load the indirect block pointed to by pointer
254 * 0 in the dinode. We would then load the indirect block pointed to by
255 * pointer 48 in that indirect block. We would then load the data block
256 * pointed to by pointer 165 in that indirect block.
258 * ----------------------------------------
263 * ----------------------------------------
267 * ----------------------------------------
271 * |0 5 6 7 8 9 0 1 2|
272 * ----------------------------------------
276 * ----------------------------------------
281 * ----------------------------------------
285 * ----------------------------------------
286 * | Data block containing offset |
290 * ----------------------------------------
294 static void find_metapath(struct gfs2_inode *ip, uint64_t block,
297 struct gfs2_sbd *sdp = ip->i_sbd;
301 for (i = ip->i_di.di_height; i--;)
302 mp->mp_list[i] = (__u16)do_div(b, sdp->sd_inptrs);
307 * metapointer - Return pointer to start of metadata in a buffer
309 * @height: The metadata height (0 = dinode)
312 * Return a pointer to the block number of the next height of the metadata
313 * tree given a buffer containing the pointer to the current height of the
317 static inline u64 *metapointer(struct buffer_head *bh, int *boundary,
318 unsigned int height, const struct metapath *mp)
320 unsigned int head_size = (height > 0) ?
321 sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode);
324 ptr = ((u64 *)(bh->b_data + head_size)) + mp->mp_list[height];
325 if (ptr + 1 == (u64*)(bh->b_data + bh->b_size))
331 * lookup_block - Get the next metadata block in metadata tree
332 * @ip: The GFS2 inode
333 * @bh: Buffer containing the pointers to metadata blocks
334 * @height: The height of the tree (0 = dinode)
336 * @create: Non-zero if we may create a new meatdata block
337 * @new: Used to indicate if we did create a new metadata block
338 * @block: the returned disk block number
340 * Given a metatree, complete to a particular height, checks to see if the next
341 * height of the tree exists. If not the next height of the tree is created.
342 * The block number of the next height of the metadata tree is returned.
346 static int lookup_block(struct gfs2_inode *ip, struct buffer_head *bh,
347 unsigned int height, struct metapath *mp, int create,
348 int *new, uint64_t *block)
351 uint64_t *ptr = metapointer(bh, &boundary, height, mp);
354 *block = be64_to_cpu(*ptr);
363 if (height == ip->i_di.di_height - 1 && !gfs2_is_dir(ip))
364 *block = gfs2_alloc_data(ip);
366 *block = gfs2_alloc_meta(ip);
368 gfs2_trans_add_bh(ip->i_gl, bh, 1);
370 *ptr = cpu_to_be64(*block);
371 ip->i_di.di_blocks++;
378 * gfs2_block_pointers - Map a block from an inode to a disk block
380 * @lblock: The logical block number
381 * @new: Value/Result argument (1 = may create/did create new blocks)
382 * @boundary: gets set if we've hit a block boundary
383 * @mp: metapath to use
385 * Find the block number on the current device which corresponds to an
386 * inode's block. If the block had to be created, "new" will be set.
391 static struct buffer_head *gfs2_block_pointers(struct inode *inode, u64 lblock,
392 int *new, u64 *dblock,
396 struct gfs2_inode *ip = inode->u.generic_ip;
397 struct gfs2_sbd *sdp = ip->i_sbd;
398 struct buffer_head *bh;
402 unsigned int end_of_metadata;
409 if (gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip)))
412 bsize = (gfs2_is_dir(ip)) ? sdp->sd_jbsize : sdp->sd_sb.sb_bsize;
414 height = calc_tree_height(ip, (lblock + 1) * bsize);
415 if (ip->i_di.di_height < height) {
419 error = build_height(ip, height);
424 find_metapath(ip, lblock, mp);
425 end_of_metadata = ip->i_di.di_height - 1;
427 error = gfs2_meta_inode_buffer(ip, &bh);
431 for (x = 0; x < end_of_metadata; x++) {
432 lookup_block(ip, bh, x, mp, create, new, dblock);
437 error = gfs2_meta_indirect_buffer(ip, x+1, *dblock, *new, &bh);
442 *boundary = lookup_block(ip, bh, end_of_metadata, mp, create, new, dblock);
444 struct buffer_head *dibh;
445 error = gfs2_meta_inode_buffer(ip, &dibh);
447 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
448 gfs2_dinode_out(&ip->i_di, dibh->b_data);
454 return ERR_PTR(error);
458 static inline void bmap_lock(struct inode *inode, int create)
460 struct gfs2_inode *ip = inode->u.generic_ip;
462 down_write(&ip->i_rw_mutex);
464 down_read(&ip->i_rw_mutex);
467 static inline void bmap_unlock(struct inode *inode, int create)
469 struct gfs2_inode *ip = inode->u.generic_ip;
471 up_write(&ip->i_rw_mutex);
473 up_read(&ip->i_rw_mutex);
476 int gfs2_block_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, int *boundary)
479 struct buffer_head *bh;
482 bmap_lock(inode, create);
483 bh = gfs2_block_pointers(inode, lblock, new, dblock, boundary, &mp);
484 bmap_unlock(inode, create);
493 int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen)
495 struct gfs2_inode *ip = inode->u.generic_ip;
496 struct gfs2_sbd *sdp = ip->i_sbd;
498 struct buffer_head *bh;
506 bmap_lock(inode, create);
507 bh = gfs2_block_pointers(inode, lblock, new, dblock, &boundary, &mp);
510 if (bh && !IS_ERR(bh) && *dblock && !*new) {
514 unsigned end_of_metadata = ip->i_di.di_height - 1;
516 nptrs = (end_of_metadata) ? sdp->sd_inptrs : sdp->sd_diptrs;
517 while (++mp.mp_list[end_of_metadata] < nptrs) {
518 lookup_block(ip, bh, end_of_metadata, &mp, 0, &tmp_new, &tmp_dblock);
519 if (*dblock + *extlen != tmp_dblock)
524 bmap_unlock(inode, create);
534 * recursive_scan - recursively scan through the end of a file
536 * @dibh: the dinode buffer
537 * @mp: the path through the metadata to the point to start
538 * @height: the height the recursion is at
539 * @block: the indirect block to look at
540 * @first: 1 if this is the first block
541 * @bc: the call to make for each piece of metadata
542 * @data: data opaque to this function to pass to @bc
544 * When this is first called @height and @block should be zero and
545 * @first should be 1.
550 static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh,
551 struct metapath *mp, unsigned int height,
552 uint64_t block, int first, block_call_t bc,
555 struct gfs2_sbd *sdp = ip->i_sbd;
556 struct buffer_head *bh = NULL;
557 uint64_t *top, *bottom;
560 int mh_size = sizeof(struct gfs2_meta_header);
563 error = gfs2_meta_inode_buffer(ip, &bh);
568 top = (uint64_t *)(bh->b_data + sizeof(struct gfs2_dinode)) +
570 bottom = (uint64_t *)(bh->b_data + sizeof(struct gfs2_dinode)) +
573 error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh);
577 top = (uint64_t *)(bh->b_data + mh_size) +
578 ((first) ? mp->mp_list[height] : 0);
580 bottom = (uint64_t *)(bh->b_data + mh_size) + sdp->sd_inptrs;
583 error = bc(ip, dibh, bh, top, bottom, height, data);
587 if (height < ip->i_di.di_height - 1)
588 for (; top < bottom; top++, first = 0) {
592 bn = be64_to_cpu(*top);
594 error = recursive_scan(ip, dibh, mp, height + 1, bn,
607 * do_strip - Look for a layer a particular layer of the file and strip it off
609 * @dibh: the dinode buffer
610 * @bh: A buffer of pointers
611 * @top: The first pointer in the buffer
612 * @bottom: One more than the last pointer
613 * @height: the height this buffer is at
614 * @data: a pointer to a struct strip_mine
619 static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
620 struct buffer_head *bh, uint64_t *top, uint64_t *bottom,
621 unsigned int height, void *data)
623 struct strip_mine *sm = (struct strip_mine *)data;
624 struct gfs2_sbd *sdp = ip->i_sbd;
625 struct gfs2_rgrp_list rlist;
629 unsigned int rg_blocks = 0;
631 unsigned int revokes = 0;
638 if (height != sm->sm_height)
646 metadata = (height != ip->i_di.di_height - 1);
648 revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs;
650 error = gfs2_rindex_hold(sdp, &ip->i_alloc.al_ri_gh);
654 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
658 for (p = top; p < bottom; p++) {
662 bn = be64_to_cpu(*p);
664 if (bstart + blen == bn)
668 gfs2_rlist_add(sdp, &rlist, bstart);
676 gfs2_rlist_add(sdp, &rlist, bstart);
678 goto out; /* Nothing to do */
680 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0);
682 for (x = 0; x < rlist.rl_rgrps; x++) {
683 struct gfs2_rgrpd *rgd;
684 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
685 rg_blocks += rgd->rd_ri.ri_length;
688 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
692 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE +
693 RES_INDIRECT + RES_STATFS + RES_QUOTA,
698 down_write(&ip->i_rw_mutex);
700 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
701 gfs2_trans_add_bh(ip->i_gl, bh, 1);
706 for (p = top; p < bottom; p++) {
710 bn = be64_to_cpu(*p);
712 if (bstart + blen == bn)
717 gfs2_free_meta(ip, bstart, blen);
719 gfs2_free_data(ip, bstart, blen);
727 if (!ip->i_di.di_blocks)
728 gfs2_consist_inode(ip);
729 ip->i_di.di_blocks--;
733 gfs2_free_meta(ip, bstart, blen);
735 gfs2_free_data(ip, bstart, blen);
738 ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
740 gfs2_dinode_out(&ip->i_di, dibh->b_data);
742 up_write(&ip->i_rw_mutex);
747 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
750 gfs2_rlist_free(&rlist);
753 gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh);
759 * do_grow - Make a file look bigger than it is
761 * @size: the size to set the file to
763 * Called with an exclusive lock on @ip.
768 static int do_grow(struct gfs2_inode *ip, uint64_t size)
770 struct gfs2_sbd *sdp = ip->i_sbd;
771 struct gfs2_alloc *al;
772 struct buffer_head *dibh;
776 al = gfs2_alloc_get(ip);
778 error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
782 error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid);
786 al->al_requested = sdp->sd_max_height + RES_DATA;
788 error = gfs2_inplace_reserve(ip);
792 error = gfs2_trans_begin(sdp,
793 sdp->sd_max_height + al->al_rgd->rd_ri.ri_length +
794 RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0);
798 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
799 if (gfs2_is_stuffed(ip)) {
800 error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page,
806 h = calc_tree_height(ip, size);
807 if (ip->i_di.di_height < h) {
808 down_write(&ip->i_rw_mutex);
809 error = build_height(ip, h);
810 up_write(&ip->i_rw_mutex);
816 ip->i_di.di_size = size;
817 ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
819 error = gfs2_meta_inode_buffer(ip, &dibh);
823 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
824 gfs2_dinode_out(&ip->i_di, dibh->b_data);
831 gfs2_inplace_release(ip);
834 gfs2_quota_unlock(ip);
842 static int trunc_start(struct gfs2_inode *ip, uint64_t size)
844 struct gfs2_sbd *sdp = ip->i_sbd;
845 struct buffer_head *dibh;
846 int journaled = gfs2_is_jdata(ip);
849 error = gfs2_trans_begin(sdp,
850 RES_DINODE + ((journaled) ? RES_JDATA : 0), 0);
854 error = gfs2_meta_inode_buffer(ip, &dibh);
858 if (gfs2_is_stuffed(ip)) {
859 ip->i_di.di_size = size;
860 ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
861 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
862 gfs2_dinode_out(&ip->i_di, dibh->b_data);
863 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size);
867 if (size & (uint64_t)(sdp->sd_sb.sb_bsize - 1))
868 error = gfs2_block_truncate_page(ip->i_vnode->i_mapping);
871 ip->i_di.di_size = size;
872 ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
873 ip->i_di.di_flags |= GFS2_DIF_TRUNC_IN_PROG;
874 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
875 gfs2_dinode_out(&ip->i_di, dibh->b_data);
887 static int trunc_dealloc(struct gfs2_inode *ip, uint64_t size)
889 unsigned int height = ip->i_di.di_height;
897 lblock = (size - 1) >> ip->i_sbd->sd_sb.sb_bsize_shift;
899 find_metapath(ip, lblock, &mp);
902 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
907 struct strip_mine sm;
908 sm.sm_first = !!size;
909 sm.sm_height = height;
911 error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm);
916 gfs2_quota_unhold(ip);
923 static int trunc_end(struct gfs2_inode *ip)
925 struct gfs2_sbd *sdp = ip->i_sbd;
926 struct buffer_head *dibh;
929 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
933 down_write(&ip->i_rw_mutex);
935 error = gfs2_meta_inode_buffer(ip, &dibh);
939 if (!ip->i_di.di_size) {
940 ip->i_di.di_height = 0;
941 ip->i_di.di_goal_meta =
942 ip->i_di.di_goal_data =
944 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
946 ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
947 ip->i_di.di_flags &= ~GFS2_DIF_TRUNC_IN_PROG;
949 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
950 gfs2_dinode_out(&ip->i_di, dibh->b_data);
954 up_write(&ip->i_rw_mutex);
962 * do_shrink - make a file smaller
964 * @size: the size to make the file
965 * @truncator: function to truncate the last partial block
967 * Called with an exclusive lock on @ip.
972 static int do_shrink(struct gfs2_inode *ip, uint64_t size)
976 error = trunc_start(ip, size);
982 error = trunc_dealloc(ip, size);
984 error = trunc_end(ip);
990 * gfs2_truncatei - make a file a given size
992 * @size: the size to make the file
993 * @truncator: function to truncate the last partial block
995 * The file size can grow, shrink, or stay the same size.
1000 int gfs2_truncatei(struct gfs2_inode *ip, uint64_t size)
1004 if (gfs2_assert_warn(ip->i_sbd, S_ISREG(ip->i_di.di_mode)))
1007 if (size > ip->i_di.di_size)
1008 error = do_grow(ip, size);
1010 error = do_shrink(ip, size);
1015 int gfs2_truncatei_resume(struct gfs2_inode *ip)
1018 error = trunc_dealloc(ip, ip->i_di.di_size);
1020 error = trunc_end(ip);
1024 int gfs2_file_dealloc(struct gfs2_inode *ip)
1026 return trunc_dealloc(ip, 0);
1030 * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file
1032 * @len: the number of bytes to be written to the file
1033 * @data_blocks: returns the number of data blocks required
1034 * @ind_blocks: returns the number of indirect blocks required
1038 void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len,
1039 unsigned int *data_blocks, unsigned int *ind_blocks)
1041 struct gfs2_sbd *sdp = ip->i_sbd;
1044 if (gfs2_is_dir(ip)) {
1045 *data_blocks = DIV_ROUND_UP(len, sdp->sd_jbsize) + 2;
1046 *ind_blocks = 3 * (sdp->sd_max_jheight - 1);
1048 *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3;
1049 *ind_blocks = 3 * (sdp->sd_max_height - 1);
1052 for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) {
1053 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
1059 * gfs2_write_alloc_required - figure out if a write will require an allocation
1060 * @ip: the file being written to
1061 * @offset: the offset to write to
1062 * @len: the number of bytes being written
1063 * @alloc_required: set to 1 if an alloc is required, 0 otherwise
1068 int gfs2_write_alloc_required(struct gfs2_inode *ip, uint64_t offset,
1069 unsigned int len, int *alloc_required)
1071 struct gfs2_sbd *sdp = ip->i_sbd;
1072 uint64_t lblock, lblock_stop, dblock;
1077 *alloc_required = 0;
1082 if (gfs2_is_stuffed(ip)) {
1084 sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode))
1085 *alloc_required = 1;
1089 if (gfs2_is_dir(ip)) {
1090 unsigned int bsize = sdp->sd_jbsize;
1092 do_div(lblock, bsize);
1093 lblock_stop = offset + len + bsize - 1;
1094 do_div(lblock_stop, bsize);
1096 unsigned int shift = sdp->sd_sb.sb_bsize_shift;
1097 lblock = offset >> shift;
1098 lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift;
1101 for (; lblock < lblock_stop; lblock += extlen) {
1102 error = gfs2_extent_map(ip->i_vnode, lblock, &new, &dblock, &extlen);
1107 *alloc_required = 1;