2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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 version 2.
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/gfs2_ondisk.h>
15 #include <linux/crc32.h>
16 #include <linux/lm_interface.h>
29 #include "ops_address.h"
31 /* This doesn't need to be that large as max 64 bit pointers in a 4k
32 * block is 512, so __u16 is fine for that. It saves stack space to
36 struct buffer_head *mp_bh[GFS2_MAX_META_HEIGHT];
37 __u16 mp_list[GFS2_MAX_META_HEIGHT];
40 typedef int (*block_call_t) (struct gfs2_inode *ip, struct buffer_head *dibh,
41 struct buffer_head *bh, __be64 *top,
42 __be64 *bottom, unsigned int height,
47 unsigned int sm_height;
51 * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
53 * @dibh: the dinode buffer
54 * @block: the block number that was allocated
55 * @private: any locked page held by the caller process
60 static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
61 u64 block, struct page *page)
63 struct inode *inode = &ip->i_inode;
64 struct buffer_head *bh;
67 if (!page || page->index) {
68 page = grab_cache_page(inode->i_mapping, 0);
74 if (!PageUptodate(page)) {
75 void *kaddr = kmap(page);
77 memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode),
79 memset(kaddr + ip->i_di.di_size, 0,
80 PAGE_CACHE_SIZE - ip->i_di.di_size);
83 SetPageUptodate(page);
86 if (!page_has_buffers(page))
87 create_empty_buffers(page, 1 << inode->i_blkbits,
90 bh = page_buffers(page);
92 if (!buffer_mapped(bh))
93 map_bh(bh, inode->i_sb, block);
95 set_buffer_uptodate(bh);
96 if (!gfs2_is_jdata(ip))
97 mark_buffer_dirty(bh);
98 if (!gfs2_is_writeback(ip))
99 gfs2_trans_add_bh(ip->i_gl, bh, 0);
103 page_cache_release(page);
110 * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
111 * @ip: The GFS2 inode to unstuff
112 * @unstuffer: the routine that handles unstuffing a non-zero length file
113 * @private: private data for the unstuffer
115 * This routine unstuffs a dinode and returns it to a "normal" state such
116 * that the height can be grown in the traditional way.
121 int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
123 struct buffer_head *bh, *dibh;
124 struct gfs2_dinode *di;
126 int isdir = gfs2_is_dir(ip);
129 down_write(&ip->i_rw_mutex);
131 error = gfs2_meta_inode_buffer(ip, &dibh);
135 if (ip->i_di.di_size) {
136 /* Get a free block, fill it with the stuffed data,
137 and write it out to disk */
140 block = gfs2_alloc_meta(ip);
141 gfs2_trans_add_unrevoke(GFS2_SB(&ip->i_inode), block, 1);
142 error = gfs2_dir_get_new_buffer(ip, block, &bh);
145 gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_meta_header),
146 dibh, sizeof(struct gfs2_dinode));
149 block = gfs2_alloc_data(ip);
151 error = gfs2_unstuffer_page(ip, dibh, block, page);
157 /* Set up the pointer to the new block */
159 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
160 di = (struct gfs2_dinode *)dibh->b_data;
161 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
163 if (ip->i_di.di_size) {
164 *(__be64 *)(di + 1) = cpu_to_be64(block);
165 ip->i_di.di_blocks++;
166 gfs2_set_inode_blocks(&ip->i_inode);
167 di->di_blocks = cpu_to_be64(ip->i_di.di_blocks);
171 di->di_height = cpu_to_be16(1);
176 up_write(&ip->i_rw_mutex);
181 * build_height - Build a metadata tree of the requested height
182 * @ip: The GFS2 inode
183 * @height: The height to build to
189 static int build_height(struct inode *inode, struct metapath *mp, unsigned height)
191 struct gfs2_inode *ip = GFS2_I(inode);
192 unsigned new_height = height - ip->i_height;
193 struct buffer_head *dibh;
194 struct gfs2_dinode *di;
200 if (height <= ip->i_height)
203 error = gfs2_meta_inode_buffer(ip, &dibh);
207 for(n = 0; n < new_height; n++) {
208 bn = gfs2_alloc_meta(ip);
209 gfs2_trans_add_unrevoke(GFS2_SB(inode), bn, 1);
210 mp->mp_bh[n] = gfs2_meta_new(ip->i_gl, bn);
211 gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[n], 1);
215 bn = mp->mp_bh[0]->b_blocknr;
216 if (new_height > 1) {
217 for(; n < new_height-1; n++) {
218 gfs2_metatype_set(mp->mp_bh[n], GFS2_METATYPE_IN,
220 gfs2_buffer_clear_tail(mp->mp_bh[n],
221 sizeof(struct gfs2_meta_header));
222 bp = (__be64 *)(mp->mp_bh[n]->b_data +
223 sizeof(struct gfs2_meta_header));
224 *bp = cpu_to_be64(mp->mp_bh[n+1]->b_blocknr);
225 brelse(mp->mp_bh[n]);
229 gfs2_metatype_set(mp->mp_bh[n], GFS2_METATYPE_IN, GFS2_FORMAT_IN);
230 gfs2_buffer_copy_tail(mp->mp_bh[n], sizeof(struct gfs2_meta_header),
231 dibh, sizeof(struct gfs2_dinode));
232 brelse(mp->mp_bh[n]);
233 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
234 di = (struct gfs2_dinode *)dibh->b_data;
235 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
236 *(__be64 *)(di + 1) = cpu_to_be64(bn);
237 ip->i_height += new_height;
238 ip->i_di.di_blocks += new_height;
239 gfs2_set_inode_blocks(&ip->i_inode);
240 di->di_height = cpu_to_be16(ip->i_height);
241 di->di_blocks = cpu_to_be64(ip->i_di.di_blocks);
247 * find_metapath - Find path through the metadata tree
248 * @ip: The inode pointer
249 * @mp: The metapath to return the result in
250 * @block: The disk block to look up
252 * This routine returns a struct metapath structure that defines a path
253 * through the metadata of inode "ip" to get to block "block".
256 * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a
257 * filesystem with a blocksize of 4096.
259 * find_metapath() would return a struct metapath structure set to:
260 * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48,
261 * and mp_list[2] = 165.
263 * That means that in order to get to the block containing the byte at
264 * offset 101342453, we would load the indirect block pointed to by pointer
265 * 0 in the dinode. We would then load the indirect block pointed to by
266 * pointer 48 in that indirect block. We would then load the data block
267 * pointed to by pointer 165 in that indirect block.
269 * ----------------------------------------
274 * ----------------------------------------
278 * ----------------------------------------
282 * |0 5 6 7 8 9 0 1 2|
283 * ----------------------------------------
287 * ----------------------------------------
292 * ----------------------------------------
296 * ----------------------------------------
297 * | Data block containing offset |
301 * ----------------------------------------
305 static void find_metapath(struct gfs2_inode *ip, u64 block,
308 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
311 for (i = ip->i_height; i--;)
312 mp->mp_list[i] = do_div(block, sdp->sd_inptrs);
317 * metapointer - Return pointer to start of metadata in a buffer
318 * @height: The metadata height (0 = dinode)
321 * Return a pointer to the block number of the next height of the metadata
322 * tree given a buffer containing the pointer to the current height of the
326 static inline __be64 *metapointer(int *boundary, unsigned int height,
327 const struct metapath *mp)
329 struct buffer_head *bh = mp->mp_bh[height];
330 unsigned int head_size = (height > 0) ?
331 sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode);
334 ptr = ((__be64 *)(bh->b_data + head_size)) + mp->mp_list[height];
335 if (ptr + 1 == (__be64 *)(bh->b_data + bh->b_size))
341 * lookup_block - Get the next metadata block in metadata tree
342 * @ip: The GFS2 inode
343 * @height: The height of the tree (0 = dinode)
345 * @create: Non-zero if we may create a new meatdata block
346 * @new: Used to indicate if we did create a new metadata block
347 * @block: the returned disk block number
349 * Given a metatree, complete to a particular height, checks to see if the next
350 * height of the tree exists. If not the next height of the tree is created.
351 * The block number of the next height of the metadata tree is returned.
355 static int lookup_block(struct gfs2_inode *ip, unsigned int height,
356 struct metapath *mp, int create,
357 int *new, u64 *block)
360 __be64 *ptr = metapointer(&boundary, height, mp);
363 *block = be64_to_cpu(*ptr);
372 if (height == ip->i_height - 1 && !gfs2_is_dir(ip))
373 *block = gfs2_alloc_data(ip);
375 *block = gfs2_alloc_meta(ip);
376 gfs2_trans_add_unrevoke(GFS2_SB(&ip->i_inode), *block, 1);
379 gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[height], 1);
381 *ptr = cpu_to_be64(*block);
382 ip->i_di.di_blocks++;
383 gfs2_set_inode_blocks(&ip->i_inode);
389 static int lookup_metapath(struct inode *inode, struct metapath *mp,
390 int create, int *new, u64 *dblock)
392 struct buffer_head *bh;
393 struct gfs2_inode *ip = GFS2_I(inode);
394 unsigned int end_of_metadata = ip->i_height - 1;
396 int ret = gfs2_meta_inode_buffer(ip, &bh);
402 for (x = 0; x < end_of_metadata; x++) {
403 lookup_block(ip, x, mp, create, new, dblock);
407 ret = gfs2_meta_indirect_buffer(ip, x+1, *dblock, *new, &mp->mp_bh[x+1]);
412 return lookup_block(ip, end_of_metadata, mp, create, new, dblock);
415 static void release_metapath(struct metapath *mp)
419 for (i = 0; i < GFS2_MAX_META_HEIGHT; i++)
421 brelse(mp->mp_bh[i]);
424 static inline void bmap_lock(struct inode *inode, int create)
426 struct gfs2_inode *ip = GFS2_I(inode);
428 down_write(&ip->i_rw_mutex);
430 down_read(&ip->i_rw_mutex);
433 static inline void bmap_unlock(struct inode *inode, int create)
435 struct gfs2_inode *ip = GFS2_I(inode);
437 up_write(&ip->i_rw_mutex);
439 up_read(&ip->i_rw_mutex);
443 * gfs2_block_map - Map a block from an inode to a disk block
445 * @lblock: The logical block number
446 * @bh_map: The bh to be mapped
448 * Find the block number on the current device which corresponds to an
449 * inode's block. If the block had to be created, "new" will be set.
454 int gfs2_block_map(struct inode *inode, sector_t lblock,
455 struct buffer_head *bh_map, int create)
457 struct gfs2_inode *ip = GFS2_I(inode);
458 struct gfs2_sbd *sdp = GFS2_SB(inode);
459 unsigned int bsize = sdp->sd_sb.sb_bsize;
464 unsigned int maxlen = bh_map->b_size >> inode->i_blkbits;
467 const u64 *arr = sdp->sd_heightsize;
470 if (gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip)))
473 memset(mp.mp_bh, 0, sizeof(mp.mp_bh));
474 bmap_lock(inode, create);
475 clear_buffer_mapped(bh_map);
476 clear_buffer_new(bh_map);
477 clear_buffer_boundary(bh_map);
478 if (gfs2_is_dir(ip)) {
479 bsize = sdp->sd_jbsize;
480 arr = sdp->sd_jheightsize;
482 size = (lblock + 1) * bsize;
484 if (size > arr[ip->i_height]) {
485 u8 height = ip->i_height;
488 while (size > arr[height])
490 error = build_height(inode, &mp, height);
495 find_metapath(ip, lblock, &mp);
496 error = lookup_metapath(inode, &mp, create, &new, &dblock);
502 map_bh(bh_map, inode->i_sb, dblock);
504 set_buffer_boundary(bh_map);
506 gfs2_trans_add_bh(ip->i_gl, mp.mp_bh[0], 1);
507 gfs2_dinode_out(ip, mp.mp_bh[0]->b_data);
508 set_buffer_new(bh_map);
511 while(--maxlen && !buffer_boundary(bh_map)) {
513 mp.mp_list[ip->i_height - 1]++;
514 boundary = lookup_block(ip, ip->i_height - 1, &mp, 0, &new, &eblock);
515 if (eblock != ++dblock)
517 bh_map->b_size += (1 << inode->i_blkbits);
519 set_buffer_boundary(bh_map);
525 release_metapath(&mp);
526 bmap_unlock(inode, create);
531 * Deprecated: do not use in new code
533 int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen)
535 struct buffer_head bh = { .b_state = 0, .b_blocknr = 0 };
543 bh.b_size = 1 << (inode->i_blkbits + 5);
544 ret = gfs2_block_map(inode, lblock, &bh, create);
545 *extlen = bh.b_size >> inode->i_blkbits;
546 *dblock = bh.b_blocknr;
555 * recursive_scan - recursively scan through the end of a file
557 * @dibh: the dinode buffer
558 * @mp: the path through the metadata to the point to start
559 * @height: the height the recursion is at
560 * @block: the indirect block to look at
561 * @first: 1 if this is the first block
562 * @bc: the call to make for each piece of metadata
563 * @data: data opaque to this function to pass to @bc
565 * When this is first called @height and @block should be zero and
566 * @first should be 1.
571 static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh,
572 struct metapath *mp, unsigned int height,
573 u64 block, int first, block_call_t bc,
576 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
577 struct buffer_head *bh = NULL;
578 __be64 *top, *bottom;
581 int mh_size = sizeof(struct gfs2_meta_header);
584 error = gfs2_meta_inode_buffer(ip, &bh);
589 top = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0];
590 bottom = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + sdp->sd_diptrs;
592 error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh);
596 top = (__be64 *)(bh->b_data + mh_size) +
597 (first ? mp->mp_list[height] : 0);
599 bottom = (__be64 *)(bh->b_data + mh_size) + sdp->sd_inptrs;
602 error = bc(ip, dibh, bh, top, bottom, height, data);
606 if (height < ip->i_height - 1)
607 for (; top < bottom; top++, first = 0) {
611 bn = be64_to_cpu(*top);
613 error = recursive_scan(ip, dibh, mp, height + 1, bn,
625 * do_strip - Look for a layer a particular layer of the file and strip it off
627 * @dibh: the dinode buffer
628 * @bh: A buffer of pointers
629 * @top: The first pointer in the buffer
630 * @bottom: One more than the last pointer
631 * @height: the height this buffer is at
632 * @data: a pointer to a struct strip_mine
637 static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
638 struct buffer_head *bh, __be64 *top, __be64 *bottom,
639 unsigned int height, void *data)
641 struct strip_mine *sm = data;
642 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
643 struct gfs2_rgrp_list rlist;
647 unsigned int rg_blocks = 0;
649 unsigned int revokes = 0;
656 if (height != sm->sm_height)
664 metadata = (height != ip->i_height - 1);
666 revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs;
668 error = gfs2_rindex_hold(sdp, &ip->i_alloc->al_ri_gh);
672 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
676 for (p = top; p < bottom; p++) {
680 bn = be64_to_cpu(*p);
682 if (bstart + blen == bn)
686 gfs2_rlist_add(sdp, &rlist, bstart);
694 gfs2_rlist_add(sdp, &rlist, bstart);
696 goto out; /* Nothing to do */
698 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
700 for (x = 0; x < rlist.rl_rgrps; x++) {
701 struct gfs2_rgrpd *rgd;
702 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
703 rg_blocks += rgd->rd_length;
706 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
710 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE +
711 RES_INDIRECT + RES_STATFS + RES_QUOTA,
716 down_write(&ip->i_rw_mutex);
718 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
719 gfs2_trans_add_bh(ip->i_gl, bh, 1);
724 for (p = top; p < bottom; p++) {
728 bn = be64_to_cpu(*p);
730 if (bstart + blen == bn)
735 gfs2_free_meta(ip, bstart, blen);
737 gfs2_free_data(ip, bstart, blen);
745 if (!ip->i_di.di_blocks)
746 gfs2_consist_inode(ip);
747 ip->i_di.di_blocks--;
748 gfs2_set_inode_blocks(&ip->i_inode);
752 gfs2_free_meta(ip, bstart, blen);
754 gfs2_free_data(ip, bstart, blen);
757 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
759 gfs2_dinode_out(ip, dibh->b_data);
761 up_write(&ip->i_rw_mutex);
766 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
768 gfs2_rlist_free(&rlist);
770 gfs2_glock_dq_uninit(&ip->i_alloc->al_ri_gh);
775 * do_grow - Make a file look bigger than it is
777 * @size: the size to set the file to
779 * Called with an exclusive lock on @ip.
784 static int do_grow(struct gfs2_inode *ip, u64 size)
786 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
787 struct gfs2_alloc *al;
788 struct buffer_head *dibh;
791 al = gfs2_alloc_get(ip);
793 error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
797 error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
801 al->al_requested = sdp->sd_max_height + RES_DATA;
803 error = gfs2_inplace_reserve(ip);
807 error = gfs2_trans_begin(sdp,
808 sdp->sd_max_height + al->al_rgd->rd_length +
809 RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0);
813 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
814 const u64 *arr = sdp->sd_heightsize;
815 if (gfs2_is_stuffed(ip)) {
816 error = gfs2_unstuff_dinode(ip, NULL);
821 down_write(&ip->i_rw_mutex);
822 if (size > arr[ip->i_height]) {
824 u8 height = ip->i_height;
825 while(size > arr[height])
827 error = build_height(&ip->i_inode, &mp, height);
829 up_write(&ip->i_rw_mutex);
834 ip->i_di.di_size = size;
835 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
837 error = gfs2_meta_inode_buffer(ip, &dibh);
841 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
842 gfs2_dinode_out(ip, dibh->b_data);
848 gfs2_inplace_release(ip);
850 gfs2_quota_unlock(ip);
858 * gfs2_block_truncate_page - Deal with zeroing out data for truncate
860 * This is partly borrowed from ext3.
862 static int gfs2_block_truncate_page(struct address_space *mapping)
864 struct inode *inode = mapping->host;
865 struct gfs2_inode *ip = GFS2_I(inode);
866 loff_t from = inode->i_size;
867 unsigned long index = from >> PAGE_CACHE_SHIFT;
868 unsigned offset = from & (PAGE_CACHE_SIZE-1);
869 unsigned blocksize, iblock, length, pos;
870 struct buffer_head *bh;
874 page = grab_cache_page(mapping, index);
878 blocksize = inode->i_sb->s_blocksize;
879 length = blocksize - (offset & (blocksize - 1));
880 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
882 if (!page_has_buffers(page))
883 create_empty_buffers(page, blocksize, 0);
885 /* Find the buffer that contains "offset" */
886 bh = page_buffers(page);
888 while (offset >= pos) {
889 bh = bh->b_this_page;
896 if (!buffer_mapped(bh)) {
897 gfs2_block_map(inode, iblock, bh, 0);
898 /* unmapped? It's a hole - nothing to do */
899 if (!buffer_mapped(bh))
903 /* Ok, it's mapped. Make sure it's up-to-date */
904 if (PageUptodate(page))
905 set_buffer_uptodate(bh);
907 if (!buffer_uptodate(bh)) {
909 ll_rw_block(READ, 1, &bh);
911 /* Uhhuh. Read error. Complain and punt. */
912 if (!buffer_uptodate(bh))
917 if (!gfs2_is_writeback(ip))
918 gfs2_trans_add_bh(ip->i_gl, bh, 0);
920 zero_user(page, offset, length);
924 page_cache_release(page);
928 static int trunc_start(struct gfs2_inode *ip, u64 size)
930 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
931 struct buffer_head *dibh;
932 int journaled = gfs2_is_jdata(ip);
935 error = gfs2_trans_begin(sdp,
936 RES_DINODE + (journaled ? RES_JDATA : 0), 0);
940 error = gfs2_meta_inode_buffer(ip, &dibh);
944 if (gfs2_is_stuffed(ip)) {
945 ip->i_di.di_size = size;
946 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
947 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
948 gfs2_dinode_out(ip, dibh->b_data);
949 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size);
953 if (size & (u64)(sdp->sd_sb.sb_bsize - 1))
954 error = gfs2_block_truncate_page(ip->i_inode.i_mapping);
957 ip->i_di.di_size = size;
958 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
959 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, dibh->b_data);
972 static int trunc_dealloc(struct gfs2_inode *ip, u64 size)
974 unsigned int height = ip->i_height;
982 lblock = (size - 1) >> GFS2_SB(&ip->i_inode)->sd_sb.sb_bsize_shift;
984 find_metapath(ip, lblock, &mp);
987 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
992 struct strip_mine sm;
993 sm.sm_first = !!size;
994 sm.sm_height = height;
996 error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm);
1001 gfs2_quota_unhold(ip);
1008 static int trunc_end(struct gfs2_inode *ip)
1010 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1011 struct buffer_head *dibh;
1014 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1018 down_write(&ip->i_rw_mutex);
1020 error = gfs2_meta_inode_buffer(ip, &dibh);
1024 if (!ip->i_di.di_size) {
1026 ip->i_goal = ip->i_no_addr;
1027 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
1029 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
1030 ip->i_di.di_flags &= ~GFS2_DIF_TRUNC_IN_PROG;
1032 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1033 gfs2_dinode_out(ip, dibh->b_data);
1037 up_write(&ip->i_rw_mutex);
1038 gfs2_trans_end(sdp);
1043 * do_shrink - make a file smaller
1045 * @size: the size to make the file
1046 * @truncator: function to truncate the last partial block
1048 * Called with an exclusive lock on @ip.
1053 static int do_shrink(struct gfs2_inode *ip, u64 size)
1057 error = trunc_start(ip, size);
1063 error = trunc_dealloc(ip, size);
1065 error = trunc_end(ip);
1070 static int do_touch(struct gfs2_inode *ip, u64 size)
1072 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1073 struct buffer_head *dibh;
1076 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1080 down_write(&ip->i_rw_mutex);
1082 error = gfs2_meta_inode_buffer(ip, &dibh);
1086 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
1087 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1088 gfs2_dinode_out(ip, dibh->b_data);
1092 up_write(&ip->i_rw_mutex);
1093 gfs2_trans_end(sdp);
1098 * gfs2_truncatei - make a file a given size
1100 * @size: the size to make the file
1101 * @truncator: function to truncate the last partial block
1103 * The file size can grow, shrink, or stay the same size.
1108 int gfs2_truncatei(struct gfs2_inode *ip, u64 size)
1112 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), S_ISREG(ip->i_inode.i_mode)))
1115 if (size > ip->i_di.di_size)
1116 error = do_grow(ip, size);
1117 else if (size < ip->i_di.di_size)
1118 error = do_shrink(ip, size);
1120 /* update time stamps */
1121 error = do_touch(ip, size);
1126 int gfs2_truncatei_resume(struct gfs2_inode *ip)
1129 error = trunc_dealloc(ip, ip->i_di.di_size);
1131 error = trunc_end(ip);
1135 int gfs2_file_dealloc(struct gfs2_inode *ip)
1137 return trunc_dealloc(ip, 0);
1141 * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file
1143 * @len: the number of bytes to be written to the file
1144 * @data_blocks: returns the number of data blocks required
1145 * @ind_blocks: returns the number of indirect blocks required
1149 void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len,
1150 unsigned int *data_blocks, unsigned int *ind_blocks)
1152 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1155 if (gfs2_is_dir(ip)) {
1156 *data_blocks = DIV_ROUND_UP(len, sdp->sd_jbsize) + 2;
1157 *ind_blocks = 3 * (sdp->sd_max_jheight - 1);
1159 *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3;
1160 *ind_blocks = 3 * (sdp->sd_max_height - 1);
1163 for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) {
1164 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
1170 * gfs2_write_alloc_required - figure out if a write will require an allocation
1171 * @ip: the file being written to
1172 * @offset: the offset to write to
1173 * @len: the number of bytes being written
1174 * @alloc_required: set to 1 if an alloc is required, 0 otherwise
1179 int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
1180 unsigned int len, int *alloc_required)
1182 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1183 struct buffer_head bh;
1185 u64 lblock, lblock_stop, size;
1187 *alloc_required = 0;
1192 if (gfs2_is_stuffed(ip)) {
1194 sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode))
1195 *alloc_required = 1;
1199 *alloc_required = 1;
1200 shift = sdp->sd_sb.sb_bsize_shift;
1201 if (gfs2_is_dir(ip)) {
1202 unsigned int bsize = sdp->sd_jbsize;
1204 do_div(lblock, bsize);
1205 lblock_stop = offset + len + bsize - 1;
1206 do_div(lblock_stop, bsize);
1208 u64 end_of_file = (ip->i_di.di_size + sdp->sd_sb.sb_bsize - 1) >> shift;
1209 lblock = offset >> shift;
1210 lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift;
1211 if (lblock_stop > end_of_file)
1215 size = (lblock_stop - lblock) << shift;
1219 gfs2_block_map(&ip->i_inode, lblock, &bh, 0);
1220 if (!buffer_mapped(&bh))
1223 lblock += (bh.b_size >> ip->i_inode.i_blkbits);
1226 *alloc_required = 0;