blob: fe0500c0af7aab88ca4276234df6894cca7290b3 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
David Teiglandb3b94fa2006-01-16 16:50:04 +000010#include <linux/spinlock.h>
11#include <linux/completion.h>
12#include <linux/buffer_head.h>
Benjamin Marzinski64dd1532011-09-12 18:15:24 -050013#include <linux/blkdev.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050014#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050015#include <linux/crc32.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000016
17#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050018#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000019#include "bmap.h"
20#include "glock.h"
21#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000022#include "meta_io.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000023#include "quota.h"
24#include "rgrp.h"
Steven Whitehouse45138992013-01-28 09:30:07 +000025#include "log.h"
Bob Peterson4c16c362011-02-23 16:11:33 -050026#include "super.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000027#include "trans.h"
Steven Whitehouse18ec7d52006-02-08 11:50:51 +000028#include "dir.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050029#include "util.h"
Steven Whitehouse63997772009-06-12 08:49:20 +010030#include "trace_gfs2.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000031
32/* This doesn't need to be that large as max 64 bit pointers in a 4k
33 * block is 512, so __u16 is fine for that. It saves stack space to
34 * keep it small.
35 */
36struct metapath {
Steven Whitehousedbac6712008-01-29 09:12:55 +000037 struct buffer_head *mp_bh[GFS2_MAX_META_HEIGHT];
David Teiglandb3b94fa2006-01-16 16:50:04 +000038 __u16 mp_list[GFS2_MAX_META_HEIGHT];
39};
40
David Teiglandb3b94fa2006-01-16 16:50:04 +000041struct strip_mine {
42 int sm_first;
43 unsigned int sm_height;
44};
45
46/**
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040047 * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
48 * @ip: the inode
49 * @dibh: the dinode buffer
50 * @block: the block number that was allocated
Steven Whitehouseff8f33c2010-08-11 09:37:53 +010051 * @page: The (optional) page. This is looked up if @page is NULL
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040052 *
53 * Returns: errno
54 */
55
56static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
Steven Whitehousecd915492006-09-04 12:49:07 -040057 u64 block, struct page *page)
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040058{
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040059 struct inode *inode = &ip->i_inode;
60 struct buffer_head *bh;
61 int release = 0;
62
63 if (!page || page->index) {
Bob Peterson220cca22012-03-19 15:25:50 -040064 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040065 if (!page)
66 return -ENOMEM;
67 release = 1;
68 }
69
70 if (!PageUptodate(page)) {
71 void *kaddr = kmap(page);
Steven Whitehouse602c89d2010-03-25 14:32:43 +000072 u64 dsize = i_size_read(inode);
73
74 if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode)))
75 dsize = dibh->b_size - sizeof(struct gfs2_dinode);
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040076
Steven Whitehouse602c89d2010-03-25 14:32:43 +000077 memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
78 memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize);
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040079 kunmap(page);
80
81 SetPageUptodate(page);
82 }
83
84 if (!page_has_buffers(page))
85 create_empty_buffers(page, 1 << inode->i_blkbits,
86 (1 << BH_Uptodate));
87
88 bh = page_buffers(page);
89
90 if (!buffer_mapped(bh))
91 map_bh(bh, inode->i_sb, block);
92
93 set_buffer_uptodate(bh);
Steven Whitehouseeaf96522007-08-27 09:49:37 +010094 if (!gfs2_is_jdata(ip))
95 mark_buffer_dirty(bh);
Steven Whitehousebf36a712007-10-17 08:35:19 +010096 if (!gfs2_is_writeback(ip))
Steven Whitehouse350a9b02012-12-14 12:36:02 +000097 gfs2_trans_add_data(ip->i_gl, bh);
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040098
99 if (release) {
100 unlock_page(page);
101 page_cache_release(page);
102 }
103
104 return 0;
105}
106
107/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000108 * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
109 * @ip: The GFS2 inode to unstuff
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100110 * @page: The (optional) page. This is looked up if the @page is NULL
David Teiglandb3b94fa2006-01-16 16:50:04 +0000111 *
112 * This routine unstuffs a dinode and returns it to a "normal" state such
113 * that the height can be grown in the traditional way.
114 *
115 * Returns: errno
116 */
117
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400118int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000119{
120 struct buffer_head *bh, *dibh;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400121 struct gfs2_dinode *di;
Steven Whitehousecd915492006-09-04 12:49:07 -0400122 u64 block = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000123 int isdir = gfs2_is_dir(ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000124 int error;
125
126 down_write(&ip->i_rw_mutex);
127
128 error = gfs2_meta_inode_buffer(ip, &dibh);
129 if (error)
130 goto out;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400131
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100132 if (i_size_read(&ip->i_inode)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000133 /* Get a free block, fill it with the stuffed data,
134 and write it out to disk */
135
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000136 unsigned int n = 1;
Bob Peterson6e87ed02011-11-18 10:58:32 -0500137 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
Steven Whitehouse09010972009-05-20 10:48:47 +0100138 if (error)
139 goto out_brelse;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000140 if (isdir) {
Steven Whitehouse5731be52008-02-01 13:16:55 +0000141 gfs2_trans_add_unrevoke(GFS2_SB(&ip->i_inode), block, 1);
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400142 error = gfs2_dir_get_new_buffer(ip, block, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000143 if (error)
144 goto out_brelse;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400145 gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_meta_header),
David Teiglandb3b94fa2006-01-16 16:50:04 +0000146 dibh, sizeof(struct gfs2_dinode));
147 brelse(bh);
148 } else {
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400149 error = gfs2_unstuffer_page(ip, dibh, block, page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000150 if (error)
151 goto out_brelse;
152 }
153 }
154
155 /* Set up the pointer to the new block */
156
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000157 gfs2_trans_add_meta(ip->i_gl, dibh);
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400158 di = (struct gfs2_dinode *)dibh->b_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000159 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
160
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100161 if (i_size_read(&ip->i_inode)) {
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400162 *(__be64 *)(di + 1) = cpu_to_be64(block);
Steven Whitehouse77658aa2008-02-12 14:17:27 +0000163 gfs2_add_inode_blocks(&ip->i_inode, 1);
164 di->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000165 }
166
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000167 ip->i_height = 1;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400168 di->di_height = cpu_to_be16(1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000169
Steven Whitehousea91ea692006-09-04 12:04:26 -0400170out_brelse:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000171 brelse(dibh);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400172out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000173 up_write(&ip->i_rw_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000174 return error;
175}
176
David Teiglandb3b94fa2006-01-16 16:50:04 +0000177
178/**
179 * find_metapath - Find path through the metadata tree
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000180 * @sdp: The superblock
David Teiglandb3b94fa2006-01-16 16:50:04 +0000181 * @mp: The metapath to return the result in
182 * @block: The disk block to look up
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000183 * @height: The pre-calculated height of the metadata tree
David Teiglandb3b94fa2006-01-16 16:50:04 +0000184 *
185 * This routine returns a struct metapath structure that defines a path
186 * through the metadata of inode "ip" to get to block "block".
187 *
188 * Example:
189 * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a
190 * filesystem with a blocksize of 4096.
191 *
192 * find_metapath() would return a struct metapath structure set to:
193 * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48,
194 * and mp_list[2] = 165.
195 *
196 * That means that in order to get to the block containing the byte at
197 * offset 101342453, we would load the indirect block pointed to by pointer
198 * 0 in the dinode. We would then load the indirect block pointed to by
199 * pointer 48 in that indirect block. We would then load the data block
200 * pointed to by pointer 165 in that indirect block.
201 *
202 * ----------------------------------------
203 * | Dinode | |
204 * | | 4|
205 * | |0 1 2 3 4 5 9|
206 * | | 6|
207 * ----------------------------------------
208 * |
209 * |
210 * V
211 * ----------------------------------------
212 * | Indirect Block |
213 * | 5|
214 * | 4 4 4 4 4 5 5 1|
215 * |0 5 6 7 8 9 0 1 2|
216 * ----------------------------------------
217 * |
218 * |
219 * V
220 * ----------------------------------------
221 * | Indirect Block |
222 * | 1 1 1 1 1 5|
223 * | 6 6 6 6 6 1|
224 * |0 3 4 5 6 7 2|
225 * ----------------------------------------
226 * |
227 * |
228 * V
229 * ----------------------------------------
230 * | Data block containing offset |
231 * | 101342453 |
232 * | |
233 * | |
234 * ----------------------------------------
235 *
236 */
237
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000238static void find_metapath(const struct gfs2_sbd *sdp, u64 block,
239 struct metapath *mp, unsigned int height)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000240{
David Teiglandb3b94fa2006-01-16 16:50:04 +0000241 unsigned int i;
242
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000243 for (i = height; i--;)
Bob Peterson7eabb772008-01-28 11:24:35 -0600244 mp->mp_list[i] = do_div(block, sdp->sd_inptrs);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000245
246}
247
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500248static inline unsigned int metapath_branch_start(const struct metapath *mp)
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000249{
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500250 if (mp->mp_list[0] == 0)
251 return 2;
252 return 1;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000253}
254
David Teiglandb3b94fa2006-01-16 16:50:04 +0000255/**
256 * metapointer - Return pointer to start of metadata in a buffer
David Teiglandb3b94fa2006-01-16 16:50:04 +0000257 * @height: The metadata height (0 = dinode)
258 * @mp: The metapath
259 *
260 * Return a pointer to the block number of the next height of the metadata
261 * tree given a buffer containing the pointer to the current height of the
262 * metadata tree.
263 */
264
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000265static inline __be64 *metapointer(unsigned int height, const struct metapath *mp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000266{
Steven Whitehousedbac6712008-01-29 09:12:55 +0000267 struct buffer_head *bh = mp->mp_bh[height];
David Teiglandb3b94fa2006-01-16 16:50:04 +0000268 unsigned int head_size = (height > 0) ?
269 sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000270 return ((__be64 *)(bh->b_data + head_size)) + mp->mp_list[height];
David Teiglandb3b94fa2006-01-16 16:50:04 +0000271}
272
Steven Whitehouseb99b98d2011-09-21 11:05:16 +0100273static void gfs2_metapath_ra(struct gfs2_glock *gl,
274 const struct buffer_head *bh, const __be64 *pos)
275{
276 struct buffer_head *rabh;
277 const __be64 *endp = (const __be64 *)(bh->b_data + bh->b_size);
278 const __be64 *t;
279
280 for (t = pos; t < endp; t++) {
281 if (!*t)
282 continue;
283
284 rabh = gfs2_getbuf(gl, be64_to_cpu(*t), CREATE);
285 if (trylock_buffer(rabh)) {
286 if (!buffer_uptodate(rabh)) {
287 rabh->b_end_io = end_buffer_read_sync;
288 submit_bh(READA | REQ_META, rabh);
289 continue;
290 }
291 unlock_buffer(rabh);
292 }
293 brelse(rabh);
294 }
295}
296
David Teiglandb3b94fa2006-01-16 16:50:04 +0000297/**
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000298 * lookup_metapath - Walk the metadata tree to a specific point
299 * @ip: The inode
David Teiglandb3b94fa2006-01-16 16:50:04 +0000300 * @mp: The metapath
David Teiglandb3b94fa2006-01-16 16:50:04 +0000301 *
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000302 * Assumes that the inode's buffer has already been looked up and
303 * hooked onto mp->mp_bh[0] and that the metapath has been initialised
304 * by find_metapath().
David Teiglandb3b94fa2006-01-16 16:50:04 +0000305 *
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000306 * If this function encounters part of the tree which has not been
307 * allocated, it returns the current height of the tree at the point
308 * at which it found the unallocated block. Blocks which are found are
309 * added to the mp->mp_bh[] list.
310 *
311 * Returns: error or height of metadata tree
David Teiglandb3b94fa2006-01-16 16:50:04 +0000312 */
313
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000314static int lookup_metapath(struct gfs2_inode *ip, struct metapath *mp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000315{
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000316 unsigned int end_of_metadata = ip->i_height - 1;
317 unsigned int x;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000318 __be64 *ptr;
319 u64 dblock;
Steven Whitehousee23159d2008-02-12 14:48:39 +0000320 int ret;
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000321
322 for (x = 0; x < end_of_metadata; x++) {
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000323 ptr = metapointer(x, mp);
324 dblock = be64_to_cpu(*ptr);
325 if (!dblock)
326 return x + 1;
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000327
Bob Petersonf2f9c812012-05-10 08:33:55 -0400328 ret = gfs2_meta_indirect_buffer(ip, x+1, dblock, &mp->mp_bh[x+1]);
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000329 if (ret)
330 return ret;
331 }
332
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000333 return ip->i_height;
Steven Whitehousedbac6712008-01-29 09:12:55 +0000334}
335
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000336static inline void release_metapath(struct metapath *mp)
Steven Whitehousedbac6712008-01-29 09:12:55 +0000337{
338 int i;
339
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000340 for (i = 0; i < GFS2_MAX_META_HEIGHT; i++) {
341 if (mp->mp_bh[i] == NULL)
342 break;
343 brelse(mp->mp_bh[i]);
344 }
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000345}
346
Steven Whitehouse30cbf182008-02-08 13:18:11 +0000347/**
348 * gfs2_extent_length - Returns length of an extent of blocks
349 * @start: Start of the buffer
350 * @len: Length of the buffer in bytes
351 * @ptr: Current position in the buffer
352 * @limit: Max extent length to return (0 = unlimited)
353 * @eob: Set to 1 if we hit "end of block"
354 *
355 * If the first block is zero (unallocated) it will return the number of
356 * unallocated blocks in the extent, otherwise it will return the number
357 * of contiguous blocks in the extent.
358 *
359 * Returns: The length of the extent (minimum of one block)
360 */
361
362static inline unsigned int gfs2_extent_length(void *start, unsigned int len, __be64 *ptr, unsigned limit, int *eob)
363{
364 const __be64 *end = (start + len);
365 const __be64 *first = ptr;
366 u64 d = be64_to_cpu(*ptr);
367
368 *eob = 0;
369 do {
370 ptr++;
371 if (ptr >= end)
372 break;
373 if (limit && --limit == 0)
374 break;
375 if (d)
376 d++;
377 } while(be64_to_cpu(*ptr) == d);
378 if (ptr >= end)
379 *eob = 1;
380 return (ptr - first);
381}
382
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000383static inline void bmap_lock(struct gfs2_inode *ip, int create)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400384{
Steven Whitehousefd88de562006-05-05 16:59:11 -0400385 if (create)
386 down_write(&ip->i_rw_mutex);
387 else
388 down_read(&ip->i_rw_mutex);
389}
390
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000391static inline void bmap_unlock(struct gfs2_inode *ip, int create)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400392{
David Teiglandb3b94fa2006-01-16 16:50:04 +0000393 if (create)
394 up_write(&ip->i_rw_mutex);
395 else
396 up_read(&ip->i_rw_mutex);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400397}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000398
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000399static inline __be64 *gfs2_indirect_init(struct metapath *mp,
400 struct gfs2_glock *gl, unsigned int i,
401 unsigned offset, u64 bn)
402{
403 __be64 *ptr = (__be64 *)(mp->mp_bh[i - 1]->b_data +
404 ((i > 1) ? sizeof(struct gfs2_meta_header) :
405 sizeof(struct gfs2_dinode)));
406 BUG_ON(i < 1);
407 BUG_ON(mp->mp_bh[i] != NULL);
408 mp->mp_bh[i] = gfs2_meta_new(gl, bn);
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000409 gfs2_trans_add_meta(gl, mp->mp_bh[i]);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000410 gfs2_metatype_set(mp->mp_bh[i], GFS2_METATYPE_IN, GFS2_FORMAT_IN);
411 gfs2_buffer_clear_tail(mp->mp_bh[i], sizeof(struct gfs2_meta_header));
412 ptr += offset;
413 *ptr = cpu_to_be64(bn);
414 return ptr;
415}
416
417enum alloc_state {
418 ALLOC_DATA = 0,
419 ALLOC_GROW_DEPTH = 1,
420 ALLOC_GROW_HEIGHT = 2,
421 /* ALLOC_UNSTUFF = 3, TBD and rather complicated */
422};
423
424/**
425 * gfs2_bmap_alloc - Build a metadata tree of the requested height
426 * @inode: The GFS2 inode
427 * @lblock: The logical starting block of the extent
428 * @bh_map: This is used to return the mapping details
429 * @mp: The metapath
430 * @sheight: The starting height (i.e. whats already mapped)
431 * @height: The height to build to
432 * @maxlen: The max number of data blocks to alloc
433 *
434 * In this routine we may have to alloc:
435 * i) Indirect blocks to grow the metadata tree height
436 * ii) Indirect blocks to fill in lower part of the metadata tree
437 * iii) Data blocks
438 *
439 * The function is in two parts. The first part works out the total
440 * number of blocks which we need. The second part does the actual
441 * allocation asking for an extent at a time (if enough contiguous free
442 * blocks are available, there will only be one request per bmap call)
443 * and uses the state machine to initialise the blocks in order.
444 *
445 * Returns: errno on error
446 */
447
448static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
449 struct buffer_head *bh_map, struct metapath *mp,
450 const unsigned int sheight,
451 const unsigned int height,
452 const unsigned int maxlen)
453{
454 struct gfs2_inode *ip = GFS2_I(inode);
455 struct gfs2_sbd *sdp = GFS2_SB(inode);
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500456 struct super_block *sb = sdp->sd_vfs;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000457 struct buffer_head *dibh = mp->mp_bh[0];
458 u64 bn, dblock = 0;
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500459 unsigned n, i, blks, alloced = 0, iblks = 0, branch_start = 0;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000460 unsigned dblks = 0;
461 unsigned ptrs_per_blk;
462 const unsigned end_of_metadata = height - 1;
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500463 int ret;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000464 int eob = 0;
465 enum alloc_state state;
466 __be64 *ptr;
467 __be64 zero_bn = 0;
468
469 BUG_ON(sheight < 1);
470 BUG_ON(dibh == NULL);
471
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000472 gfs2_trans_add_meta(ip->i_gl, dibh);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000473
474 if (height == sheight) {
475 struct buffer_head *bh;
476 /* Bottom indirect block exists, find unalloced extent size */
477 ptr = metapointer(end_of_metadata, mp);
478 bh = mp->mp_bh[end_of_metadata];
479 dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen,
480 &eob);
481 BUG_ON(dblks < 1);
482 state = ALLOC_DATA;
483 } else {
484 /* Need to allocate indirect blocks */
485 ptrs_per_blk = height > 1 ? sdp->sd_inptrs : sdp->sd_diptrs;
486 dblks = min(maxlen, ptrs_per_blk - mp->mp_list[end_of_metadata]);
487 if (height == ip->i_height) {
488 /* Writing into existing tree, extend tree down */
489 iblks = height - sheight;
490 state = ALLOC_GROW_DEPTH;
491 } else {
492 /* Building up tree height */
493 state = ALLOC_GROW_HEIGHT;
494 iblks = height - ip->i_height;
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500495 branch_start = metapath_branch_start(mp);
496 iblks += (height - branch_start);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000497 }
498 }
499
500 /* start of the second part of the function (state machine) */
501
502 blks = dblks + iblks;
503 i = sheight;
504 do {
Steven Whitehouse09010972009-05-20 10:48:47 +0100505 int error;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000506 n = blks - alloced;
Bob Peterson6e87ed02011-11-18 10:58:32 -0500507 error = gfs2_alloc_blocks(ip, &bn, &n, 0, NULL);
Steven Whitehouse09010972009-05-20 10:48:47 +0100508 if (error)
509 return error;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000510 alloced += n;
511 if (state != ALLOC_DATA || gfs2_is_jdata(ip))
512 gfs2_trans_add_unrevoke(sdp, bn, n);
513 switch (state) {
514 /* Growing height of tree */
515 case ALLOC_GROW_HEIGHT:
516 if (i == 1) {
517 ptr = (__be64 *)(dibh->b_data +
518 sizeof(struct gfs2_dinode));
519 zero_bn = *ptr;
520 }
521 for (; i - 1 < height - ip->i_height && n > 0; i++, n--)
522 gfs2_indirect_init(mp, ip->i_gl, i, 0, bn++);
523 if (i - 1 == height - ip->i_height) {
524 i--;
525 gfs2_buffer_copy_tail(mp->mp_bh[i],
526 sizeof(struct gfs2_meta_header),
527 dibh, sizeof(struct gfs2_dinode));
528 gfs2_buffer_clear_tail(dibh,
529 sizeof(struct gfs2_dinode) +
530 sizeof(__be64));
531 ptr = (__be64 *)(mp->mp_bh[i]->b_data +
532 sizeof(struct gfs2_meta_header));
533 *ptr = zero_bn;
534 state = ALLOC_GROW_DEPTH;
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500535 for(i = branch_start; i < height; i++) {
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000536 if (mp->mp_bh[i] == NULL)
537 break;
538 brelse(mp->mp_bh[i]);
539 mp->mp_bh[i] = NULL;
540 }
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500541 i = branch_start;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000542 }
543 if (n == 0)
544 break;
545 /* Branching from existing tree */
546 case ALLOC_GROW_DEPTH:
547 if (i > 1 && i < height)
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000548 gfs2_trans_add_meta(ip->i_gl, mp->mp_bh[i-1]);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000549 for (; i < height && n > 0; i++, n--)
550 gfs2_indirect_init(mp, ip->i_gl, i,
551 mp->mp_list[i-1], bn++);
552 if (i == height)
553 state = ALLOC_DATA;
554 if (n == 0)
555 break;
556 /* Tree complete, adding data blocks */
557 case ALLOC_DATA:
558 BUG_ON(n > dblks);
559 BUG_ON(mp->mp_bh[end_of_metadata] == NULL);
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000560 gfs2_trans_add_meta(ip->i_gl, mp->mp_bh[end_of_metadata]);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000561 dblks = n;
562 ptr = metapointer(end_of_metadata, mp);
563 dblock = bn;
564 while (n-- > 0)
565 *ptr++ = cpu_to_be64(bn++);
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500566 if (buffer_zeronew(bh_map)) {
567 ret = sb_issue_zeroout(sb, dblock, dblks,
568 GFP_NOFS);
569 if (ret) {
570 fs_err(sdp,
571 "Failed to zero data buffers\n");
572 clear_buffer_zeronew(bh_map);
573 }
574 }
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000575 break;
576 }
Steven Whitehouse07ccb7b2010-02-12 10:10:55 +0000577 } while ((state != ALLOC_DATA) || !dblock);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000578
579 ip->i_height = height;
580 gfs2_add_inode_blocks(&ip->i_inode, alloced);
581 gfs2_dinode_out(ip, mp->mp_bh[0]->b_data);
582 map_bh(bh_map, inode->i_sb, dblock);
583 bh_map->b_size = dblks << inode->i_blkbits;
584 set_buffer_new(bh_map);
585 return 0;
586}
587
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500588/**
589 * gfs2_block_map - Map a block from an inode to a disk block
590 * @inode: The inode
591 * @lblock: The logical block number
592 * @bh_map: The bh to be mapped
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000593 * @create: True if its ok to alloc blocks to satify the request
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500594 *
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000595 * Sets buffer_mapped() if successful, sets buffer_boundary() if a
596 * read of metadata will be required before the next block can be
597 * mapped. Sets buffer_new() if new blocks were allocated.
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500598 *
599 * Returns: errno
600 */
601
Bob Petersone9e1ef22007-12-10 14:13:27 -0600602int gfs2_block_map(struct inode *inode, sector_t lblock,
603 struct buffer_head *bh_map, int create)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400604{
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500605 struct gfs2_inode *ip = GFS2_I(inode);
606 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000607 unsigned int bsize = sdp->sd_sb.sb_bsize;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000608 const unsigned int maxlen = bh_map->b_size >> inode->i_blkbits;
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000609 const u64 *arr = sdp->sd_heightsize;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000610 __be64 *ptr;
611 u64 size;
612 struct metapath mp;
613 int ret;
614 int eob;
615 unsigned int len;
616 struct buffer_head *bh;
617 u8 height;
618
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500619 BUG_ON(maxlen == 0);
620
Steven Whitehousedbac6712008-01-29 09:12:55 +0000621 memset(mp.mp_bh, 0, sizeof(mp.mp_bh));
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000622 bmap_lock(ip, create);
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500623 clear_buffer_mapped(bh_map);
624 clear_buffer_new(bh_map);
625 clear_buffer_boundary(bh_map);
Steven Whitehouse63997772009-06-12 08:49:20 +0100626 trace_gfs2_bmap(ip, bh_map, lblock, create, 1);
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000627 if (gfs2_is_dir(ip)) {
628 bsize = sdp->sd_jbsize;
629 arr = sdp->sd_jheightsize;
630 }
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000631
632 ret = gfs2_meta_inode_buffer(ip, &mp.mp_bh[0]);
633 if (ret)
634 goto out;
635
636 height = ip->i_height;
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500637 size = (lblock + 1) * bsize;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000638 while (size > arr[height])
639 height++;
640 find_metapath(sdp, lblock, &mp, height);
641 ret = 1;
642 if (height > ip->i_height || gfs2_is_stuffed(ip))
643 goto do_alloc;
644 ret = lookup_metapath(ip, &mp);
645 if (ret < 0)
646 goto out;
647 if (ret != ip->i_height)
648 goto do_alloc;
649 ptr = metapointer(ip->i_height - 1, &mp);
650 if (*ptr == 0)
651 goto do_alloc;
652 map_bh(bh_map, inode->i_sb, be64_to_cpu(*ptr));
653 bh = mp.mp_bh[ip->i_height - 1];
654 len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen, &eob);
655 bh_map->b_size = (len << inode->i_blkbits);
656 if (eob)
657 set_buffer_boundary(bh_map);
658 ret = 0;
659out:
Steven Whitehousedbac6712008-01-29 09:12:55 +0000660 release_metapath(&mp);
Steven Whitehouse63997772009-06-12 08:49:20 +0100661 trace_gfs2_bmap(ip, bh_map, lblock, create, ret);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000662 bmap_unlock(ip, create);
663 return ret;
664
665do_alloc:
666 /* All allocations are done here, firstly check create flag */
667 if (!create) {
668 BUG_ON(gfs2_is_stuffed(ip));
669 ret = 0;
670 goto out;
671 }
672
673 /* At this point ret is the tree depth of already allocated blocks */
674 ret = gfs2_bmap_alloc(inode, lblock, bh_map, &mp, ret, height, maxlen);
675 goto out;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400676}
677
Steven Whitehouse941e6d72008-01-28 08:47:38 +0000678/*
679 * Deprecated: do not use in new code
680 */
Steven Whitehousefd88de562006-05-05 16:59:11 -0400681int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen)
682{
Steven Whitehouse23591252006-10-13 17:25:45 -0400683 struct buffer_head bh = { .b_state = 0, .b_blocknr = 0 };
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -0400684 int ret;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400685 int create = *new;
686
687 BUG_ON(!extlen);
688 BUG_ON(!dblock);
689 BUG_ON(!new);
690
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000691 bh.b_size = 1 << (inode->i_blkbits + (create ? 0 : 5));
Bob Petersone9e1ef22007-12-10 14:13:27 -0600692 ret = gfs2_block_map(inode, lblock, &bh, create);
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -0400693 *extlen = bh.b_size >> inode->i_blkbits;
694 *dblock = bh.b_blocknr;
695 if (buffer_new(&bh))
696 *new = 1;
697 else
698 *new = 0;
699 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000700}
701
702/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000703 * do_strip - Look for a layer a particular layer of the file and strip it off
704 * @ip: the inode
705 * @dibh: the dinode buffer
706 * @bh: A buffer of pointers
707 * @top: The first pointer in the buffer
708 * @bottom: One more than the last pointer
709 * @height: the height this buffer is at
710 * @data: a pointer to a struct strip_mine
711 *
712 * Returns: errno
713 */
714
715static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
Al Virob44b84d2006-10-14 10:46:30 -0400716 struct buffer_head *bh, __be64 *top, __be64 *bottom,
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100717 unsigned int height, struct strip_mine *sm)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000718{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400719 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000720 struct gfs2_rgrp_list rlist;
Steven Whitehousecd915492006-09-04 12:49:07 -0400721 u64 bn, bstart;
Bob Peterson4c16c362011-02-23 16:11:33 -0500722 u32 blen, btotal;
Al Virob44b84d2006-10-14 10:46:30 -0400723 __be64 *p;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000724 unsigned int rg_blocks = 0;
725 int metadata;
726 unsigned int revokes = 0;
727 int x;
Bob Peterson5e2f7d62012-04-04 22:11:16 -0400728 int error;
729
730 error = gfs2_rindex_update(sdp);
731 if (error)
732 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000733
734 if (!*top)
735 sm->sm_first = 0;
736
737 if (height != sm->sm_height)
738 return 0;
739
740 if (sm->sm_first) {
741 top++;
742 sm->sm_first = 0;
743 }
744
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000745 metadata = (height != ip->i_height - 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000746 if (metadata)
747 revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs;
Steven Whitehouse6d3117b2011-05-21 14:05:58 +0100748 else if (ip->i_depth)
749 revokes = sdp->sd_inptrs;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000750
David Teiglandb3b94fa2006-01-16 16:50:04 +0000751 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
752 bstart = 0;
753 blen = 0;
754
755 for (p = top; p < bottom; p++) {
756 if (!*p)
757 continue;
758
759 bn = be64_to_cpu(*p);
760
761 if (bstart + blen == bn)
762 blen++;
763 else {
764 if (bstart)
Steven Whitehouse70b0c362011-09-02 16:08:09 +0100765 gfs2_rlist_add(ip, &rlist, bstart);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000766
767 bstart = bn;
768 blen = 1;
769 }
770 }
771
772 if (bstart)
Steven Whitehouse70b0c362011-09-02 16:08:09 +0100773 gfs2_rlist_add(ip, &rlist, bstart);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000774 else
775 goto out; /* Nothing to do */
776
Bob Petersonfe6c9912008-01-28 11:13:02 -0600777 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000778
779 for (x = 0; x < rlist.rl_rgrps; x++) {
780 struct gfs2_rgrpd *rgd;
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500781 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100782 rg_blocks += rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000783 }
784
785 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
786 if (error)
787 goto out_rlist;
788
Bob Peterson8e2e0042012-07-19 08:12:40 -0400789 if (gfs2_rs_active(ip->i_res)) /* needs to be done with the rgrp glock held */
Bob Peterson20095212013-03-13 10:26:38 -0400790 gfs2_rs_deltree(ip->i_res);
Bob Peterson8e2e0042012-07-19 08:12:40 -0400791
David Teiglandb3b94fa2006-01-16 16:50:04 +0000792 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE +
793 RES_INDIRECT + RES_STATFS + RES_QUOTA,
794 revokes);
795 if (error)
796 goto out_rg_gunlock;
797
798 down_write(&ip->i_rw_mutex);
799
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000800 gfs2_trans_add_meta(ip->i_gl, dibh);
801 gfs2_trans_add_meta(ip->i_gl, bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000802
803 bstart = 0;
804 blen = 0;
Bob Peterson4c16c362011-02-23 16:11:33 -0500805 btotal = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000806
807 for (p = top; p < bottom; p++) {
808 if (!*p)
809 continue;
810
811 bn = be64_to_cpu(*p);
812
813 if (bstart + blen == bn)
814 blen++;
815 else {
816 if (bstart) {
Eric Sandeen46fcb2e2011-06-23 10:39:34 -0500817 __gfs2_free_blocks(ip, bstart, blen, metadata);
Bob Peterson4c16c362011-02-23 16:11:33 -0500818 btotal += blen;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000819 }
820
821 bstart = bn;
822 blen = 1;
823 }
824
825 *p = 0;
Steven Whitehouse77658aa2008-02-12 14:17:27 +0000826 gfs2_add_inode_blocks(&ip->i_inode, -1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000827 }
828 if (bstart) {
Eric Sandeen46fcb2e2011-06-23 10:39:34 -0500829 __gfs2_free_blocks(ip, bstart, blen, metadata);
Bob Peterson4c16c362011-02-23 16:11:33 -0500830 btotal += blen;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000831 }
832
Bob Peterson4c16c362011-02-23 16:11:33 -0500833 gfs2_statfs_change(sdp, 0, +btotal, 0);
834 gfs2_quota_change(ip, -(s64)btotal, ip->i_inode.i_uid,
835 ip->i_inode.i_gid);
836
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100837 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000838
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500839 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000840
841 up_write(&ip->i_rw_mutex);
842
843 gfs2_trans_end(sdp);
844
Steven Whitehousea91ea692006-09-04 12:04:26 -0400845out_rg_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000846 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400847out_rlist:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000848 gfs2_rlist_free(&rlist);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400849out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000850 return error;
851}
852
853/**
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100854 * recursive_scan - recursively scan through the end of a file
855 * @ip: the inode
856 * @dibh: the dinode buffer
857 * @mp: the path through the metadata to the point to start
858 * @height: the height the recursion is at
859 * @block: the indirect block to look at
860 * @first: 1 if this is the first block
861 * @sm: data opaque to this function to pass to @bc
862 *
863 * When this is first called @height and @block should be zero and
864 * @first should be 1.
865 *
866 * Returns: errno
867 */
868
869static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh,
870 struct metapath *mp, unsigned int height,
871 u64 block, int first, struct strip_mine *sm)
872{
873 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
874 struct buffer_head *bh = NULL;
Steven Whitehouseb99b98d2011-09-21 11:05:16 +0100875 __be64 *top, *bottom;
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100876 u64 bn;
877 int error;
878 int mh_size = sizeof(struct gfs2_meta_header);
879
880 if (!height) {
881 error = gfs2_meta_inode_buffer(ip, &bh);
882 if (error)
883 return error;
884 dibh = bh;
885
886 top = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0];
887 bottom = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + sdp->sd_diptrs;
888 } else {
Bob Petersonf2f9c812012-05-10 08:33:55 -0400889 error = gfs2_meta_indirect_buffer(ip, height, block, &bh);
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100890 if (error)
891 return error;
892
893 top = (__be64 *)(bh->b_data + mh_size) +
894 (first ? mp->mp_list[height] : 0);
895
896 bottom = (__be64 *)(bh->b_data + mh_size) + sdp->sd_inptrs;
897 }
898
899 error = do_strip(ip, dibh, bh, top, bottom, height, sm);
900 if (error)
901 goto out;
902
Bob Petersonbd5437a2011-09-15 09:59:56 -0400903 if (height < ip->i_height - 1) {
Bob Petersonbd5437a2011-09-15 09:59:56 -0400904
Steven Whitehouseb99b98d2011-09-21 11:05:16 +0100905 gfs2_metapath_ra(ip->i_gl, bh, top);
Bob Petersonbd5437a2011-09-15 09:59:56 -0400906
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100907 for (; top < bottom; top++, first = 0) {
908 if (!*top)
909 continue;
910
911 bn = be64_to_cpu(*top);
912
913 error = recursive_scan(ip, dibh, mp, height + 1, bn,
914 first, sm);
915 if (error)
916 break;
917 }
Bob Petersonbd5437a2011-09-15 09:59:56 -0400918 }
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100919out:
920 brelse(bh);
921 return error;
922}
923
924
925/**
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400926 * gfs2_block_truncate_page - Deal with zeroing out data for truncate
927 *
928 * This is partly borrowed from ext3.
929 */
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100930static int gfs2_block_truncate_page(struct address_space *mapping, loff_t from)
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400931{
932 struct inode *inode = mapping->host;
933 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400934 unsigned long index = from >> PAGE_CACHE_SHIFT;
935 unsigned offset = from & (PAGE_CACHE_SIZE-1);
936 unsigned blocksize, iblock, length, pos;
937 struct buffer_head *bh;
938 struct page *page;
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400939 int err;
940
Bob Peterson220cca22012-03-19 15:25:50 -0400941 page = find_or_create_page(mapping, index, GFP_NOFS);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400942 if (!page)
943 return 0;
944
945 blocksize = inode->i_sb->s_blocksize;
946 length = blocksize - (offset & (blocksize - 1));
947 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
948
949 if (!page_has_buffers(page))
950 create_empty_buffers(page, blocksize, 0);
951
952 /* Find the buffer that contains "offset" */
953 bh = page_buffers(page);
954 pos = blocksize;
955 while (offset >= pos) {
956 bh = bh->b_this_page;
957 iblock++;
958 pos += blocksize;
959 }
960
961 err = 0;
962
963 if (!buffer_mapped(bh)) {
Bob Petersone9e1ef22007-12-10 14:13:27 -0600964 gfs2_block_map(inode, iblock, bh, 0);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400965 /* unmapped? It's a hole - nothing to do */
966 if (!buffer_mapped(bh))
967 goto unlock;
968 }
969
970 /* Ok, it's mapped. Make sure it's up-to-date */
971 if (PageUptodate(page))
972 set_buffer_uptodate(bh);
973
974 if (!buffer_uptodate(bh)) {
975 err = -EIO;
976 ll_rw_block(READ, 1, &bh);
977 wait_on_buffer(bh);
978 /* Uhhuh. Read error. Complain and punt. */
979 if (!buffer_uptodate(bh))
980 goto unlock;
S. Wendy Cheng1875f2f2007-06-25 21:14:31 -0400981 err = 0;
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400982 }
983
Steven Whitehousebf36a712007-10-17 08:35:19 +0100984 if (!gfs2_is_writeback(ip))
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000985 gfs2_trans_add_data(ip->i_gl, bh);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400986
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800987 zero_user(page, offset, length);
Steven Whitehouse40bc9a22009-06-10 09:09:40 +0100988 mark_buffer_dirty(bh);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400989unlock:
990 unlock_page(page);
991 page_cache_release(page);
992 return err;
993}
994
Steven Whitehousefa731fc2012-11-13 09:50:28 +0000995/**
996 * gfs2_journaled_truncate - Wrapper for truncate_pagecache for jdata files
997 * @inode: The inode being truncated
998 * @oldsize: The original (larger) size
999 * @newsize: The new smaller size
1000 *
1001 * With jdata files, we have to journal a revoke for each block which is
1002 * truncated. As a result, we need to split this into separate transactions
1003 * if the number of pages being truncated gets too large.
1004 */
1005
1006#define GFS2_JTRUNC_REVOKES 8192
1007
1008static int gfs2_journaled_truncate(struct inode *inode, u64 oldsize, u64 newsize)
1009{
1010 struct gfs2_sbd *sdp = GFS2_SB(inode);
1011 u64 max_chunk = GFS2_JTRUNC_REVOKES * sdp->sd_vfs->s_blocksize;
1012 u64 chunk;
1013 int error;
1014
1015 while (oldsize != newsize) {
1016 chunk = oldsize - newsize;
1017 if (chunk > max_chunk)
1018 chunk = max_chunk;
Kirill A. Shutemov7caef262013-09-12 15:13:56 -07001019 truncate_pagecache(inode, oldsize - chunk);
Steven Whitehousefa731fc2012-11-13 09:50:28 +00001020 oldsize -= chunk;
1021 gfs2_trans_end(sdp);
1022 error = gfs2_trans_begin(sdp, RES_DINODE, GFS2_JTRUNC_REVOKES);
1023 if (error)
1024 return error;
1025 }
1026
1027 return 0;
1028}
1029
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001030static int trunc_start(struct inode *inode, u64 oldsize, u64 newsize)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001031{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001032 struct gfs2_inode *ip = GFS2_I(inode);
1033 struct gfs2_sbd *sdp = GFS2_SB(inode);
1034 struct address_space *mapping = inode->i_mapping;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001035 struct buffer_head *dibh;
1036 int journaled = gfs2_is_jdata(ip);
1037 int error;
1038
Steven Whitehousefa731fc2012-11-13 09:50:28 +00001039 if (journaled)
1040 error = gfs2_trans_begin(sdp, RES_DINODE + RES_JDATA, GFS2_JTRUNC_REVOKES);
1041 else
1042 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001043 if (error)
1044 return error;
1045
1046 error = gfs2_meta_inode_buffer(ip, &dibh);
1047 if (error)
1048 goto out;
1049
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001050 gfs2_trans_add_meta(ip->i_gl, dibh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001051
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001052 if (gfs2_is_stuffed(ip)) {
1053 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + newsize);
1054 } else {
1055 if (newsize & (u64)(sdp->sd_sb.sb_bsize - 1)) {
1056 error = gfs2_block_truncate_page(mapping, newsize);
1057 if (error)
1058 goto out_brelse;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001059 }
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001060 ip->i_diskflags |= GFS2_DIF_TRUNC_IN_PROG;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001061 }
1062
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001063 i_size_write(inode, newsize);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001064 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
1065 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001066
Steven Whitehousefa731fc2012-11-13 09:50:28 +00001067 if (journaled)
1068 error = gfs2_journaled_truncate(inode, oldsize, newsize);
1069 else
Kirill A. Shutemov7caef262013-09-12 15:13:56 -07001070 truncate_pagecache(inode, newsize);
Steven Whitehousefa731fc2012-11-13 09:50:28 +00001071
1072 if (error) {
1073 brelse(dibh);
1074 return error;
1075 }
1076
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001077out_brelse:
1078 brelse(dibh);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001079out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001080 gfs2_trans_end(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001081 return error;
1082}
1083
Steven Whitehousecd915492006-09-04 12:49:07 -04001084static int trunc_dealloc(struct gfs2_inode *ip, u64 size)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001085{
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +00001086 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouseecc30c72008-01-28 10:37:35 +00001087 unsigned int height = ip->i_height;
Steven Whitehousecd915492006-09-04 12:49:07 -04001088 u64 lblock;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001089 struct metapath mp;
1090 int error;
1091
1092 if (!size)
1093 lblock = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +00001094 else
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +00001095 lblock = (size - 1) >> sdp->sd_sb.sb_bsize_shift;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001096
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +00001097 find_metapath(sdp, lblock, &mp, ip->i_height);
Bob Peterson5407e242012-05-18 09:28:23 -04001098 error = gfs2_rindex_update(sdp);
1099 if (error)
1100 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001101
Eric W. Biedermanf4108a62013-01-31 17:49:26 -08001102 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001103 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -04001104 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001105
1106 while (height--) {
1107 struct strip_mine sm;
1108 sm.sm_first = !!size;
1109 sm.sm_height = height;
1110
Steven Whitehoused56fa8a2011-09-02 12:43:41 +01001111 error = recursive_scan(ip, NULL, &mp, 0, 0, 1, &sm);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001112 if (error)
1113 break;
1114 }
1115
1116 gfs2_quota_unhold(ip);
1117
David Teiglandb3b94fa2006-01-16 16:50:04 +00001118 return error;
1119}
1120
1121static int trunc_end(struct gfs2_inode *ip)
1122{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001123 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001124 struct buffer_head *dibh;
1125 int error;
1126
1127 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1128 if (error)
1129 return error;
1130
1131 down_write(&ip->i_rw_mutex);
1132
1133 error = gfs2_meta_inode_buffer(ip, &dibh);
1134 if (error)
1135 goto out;
1136
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001137 if (!i_size_read(&ip->i_inode)) {
Steven Whitehouseecc30c72008-01-28 10:37:35 +00001138 ip->i_height = 0;
Steven Whitehousece276b02008-02-06 09:25:45 +00001139 ip->i_goal = ip->i_no_addr;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001140 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
Steven Whitehouse45138992013-01-28 09:30:07 +00001141 gfs2_ordered_del_inode(ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001142 }
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001143 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001144 ip->i_diskflags &= ~GFS2_DIF_TRUNC_IN_PROG;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001145
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001146 gfs2_trans_add_meta(ip->i_gl, dibh);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001147 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001148 brelse(dibh);
1149
Steven Whitehousea91ea692006-09-04 12:04:26 -04001150out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001151 up_write(&ip->i_rw_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001152 gfs2_trans_end(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001153 return error;
1154}
1155
1156/**
1157 * do_shrink - make a file smaller
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001158 * @inode: the inode
1159 * @oldsize: the current inode size
1160 * @newsize: the size to make the file
David Teiglandb3b94fa2006-01-16 16:50:04 +00001161 *
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001162 * Called with an exclusive lock on @inode. The @size must
1163 * be equal to or smaller than the current inode size.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001164 *
1165 * Returns: errno
1166 */
1167
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001168static int do_shrink(struct inode *inode, u64 oldsize, u64 newsize)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001169{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001170 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001171 int error;
1172
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001173 error = trunc_start(inode, oldsize, newsize);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001174 if (error < 0)
1175 return error;
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001176 if (gfs2_is_stuffed(ip))
David Teiglandb3b94fa2006-01-16 16:50:04 +00001177 return 0;
1178
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001179 error = trunc_dealloc(ip, newsize);
1180 if (error == 0)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001181 error = trunc_end(ip);
1182
1183 return error;
1184}
1185
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001186void gfs2_trim_blocks(struct inode *inode)
Wendy Chenga13b8c52007-08-20 09:29:53 -04001187{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001188 u64 size = inode->i_size;
1189 int ret;
1190
1191 ret = do_shrink(inode, size, size);
1192 WARN_ON(ret != 0);
1193}
1194
1195/**
1196 * do_grow - Touch and update inode size
1197 * @inode: The inode
1198 * @size: The new size
1199 *
1200 * This function updates the timestamps on the inode and
1201 * may also increase the size of the inode. This function
1202 * must not be called with @size any smaller than the current
1203 * inode size.
1204 *
1205 * Although it is not strictly required to unstuff files here,
1206 * earlier versions of GFS2 have a bug in the stuffed file reading
1207 * code which will result in a buffer overrun if the size is larger
1208 * than the max stuffed file size. In order to prevent this from
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001209 * occurring, such files are unstuffed, but in other cases we can
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001210 * just update the inode size directly.
1211 *
1212 * Returns: 0 on success, or -ve on error
1213 */
1214
1215static int do_grow(struct inode *inode, u64 size)
1216{
1217 struct gfs2_inode *ip = GFS2_I(inode);
1218 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse7b9cff42013-10-02 11:13:25 +01001219 struct gfs2_alloc_parms ap = { .target = 1, };
Wendy Chenga13b8c52007-08-20 09:29:53 -04001220 struct buffer_head *dibh;
1221 int error;
Bob Peterson2f7ee352012-04-12 09:19:30 -04001222 int unstuff = 0;
Wendy Chenga13b8c52007-08-20 09:29:53 -04001223
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001224 if (gfs2_is_stuffed(ip) &&
1225 (size > (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)))) {
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001226 error = gfs2_quota_lock_check(ip);
1227 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -04001228 return error;
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001229
Steven Whitehouse7b9cff42013-10-02 11:13:25 +01001230 error = gfs2_inplace_reserve(ip, &ap);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001231 if (error)
1232 goto do_grow_qunlock;
Bob Peterson2f7ee352012-04-12 09:19:30 -04001233 unstuff = 1;
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001234 }
1235
Bob Petersona01aedf2013-06-27 12:47:51 -04001236 error = gfs2_trans_begin(sdp, RES_DINODE + RES_STATFS + RES_RG_BIT +
1237 (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF ?
1238 0 : RES_QUOTA), 0);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001239 if (error)
1240 goto do_grow_release;
1241
Bob Peterson2f7ee352012-04-12 09:19:30 -04001242 if (unstuff) {
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001243 error = gfs2_unstuff_dinode(ip, NULL);
1244 if (error)
1245 goto do_end_trans;
1246 }
Wendy Chenga13b8c52007-08-20 09:29:53 -04001247
1248 error = gfs2_meta_inode_buffer(ip, &dibh);
1249 if (error)
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001250 goto do_end_trans;
Wendy Chenga13b8c52007-08-20 09:29:53 -04001251
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001252 i_size_write(inode, size);
Wendy Chenga13b8c52007-08-20 09:29:53 -04001253 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001254 gfs2_trans_add_meta(ip->i_gl, dibh);
Wendy Chenga13b8c52007-08-20 09:29:53 -04001255 gfs2_dinode_out(ip, dibh->b_data);
1256 brelse(dibh);
1257
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001258do_end_trans:
Wendy Chenga13b8c52007-08-20 09:29:53 -04001259 gfs2_trans_end(sdp);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001260do_grow_release:
Bob Peterson2f7ee352012-04-12 09:19:30 -04001261 if (unstuff) {
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001262 gfs2_inplace_release(ip);
1263do_grow_qunlock:
1264 gfs2_quota_unlock(ip);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001265 }
Wendy Chenga13b8c52007-08-20 09:29:53 -04001266 return error;
1267}
1268
David Teiglandb3b94fa2006-01-16 16:50:04 +00001269/**
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001270 * gfs2_setattr_size - make a file a given size
1271 * @inode: the inode
1272 * @newsize: the size to make the file
David Teiglandb3b94fa2006-01-16 16:50:04 +00001273 *
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001274 * The file size can grow, shrink, or stay the same size. This
1275 * is called holding i_mutex and an exclusive glock on the inode
1276 * in question.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001277 *
1278 * Returns: errno
1279 */
1280
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001281int gfs2_setattr_size(struct inode *inode, u64 newsize)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001282{
Steven Whitehouseaf5c2692013-09-27 12:49:33 +01001283 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001284 int ret;
1285 u64 oldsize;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001286
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001287 BUG_ON(!S_ISREG(inode->i_mode));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001288
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001289 ret = inode_newsize_ok(inode, newsize);
1290 if (ret)
1291 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001292
Bob Peterson2b3dcf32013-05-28 10:04:44 -04001293 ret = get_write_access(inode);
1294 if (ret)
1295 return ret;
1296
Christoph Hellwig562c72a2011-06-24 14:29:45 -04001297 inode_dio_wait(inode);
1298
Steven Whitehouseaf5c2692013-09-27 12:49:33 +01001299 ret = gfs2_rs_alloc(ip);
Bob Petersond2b47cf2013-02-01 12:03:02 -05001300 if (ret)
Bob Peterson2b3dcf32013-05-28 10:04:44 -04001301 goto out;
Bob Petersond2b47cf2013-02-01 12:03:02 -05001302
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001303 oldsize = inode->i_size;
Bob Peterson2b3dcf32013-05-28 10:04:44 -04001304 if (newsize >= oldsize) {
1305 ret = do_grow(inode, newsize);
1306 goto out;
1307 }
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001308
Steven Whitehouseaf5c2692013-09-27 12:49:33 +01001309 gfs2_rs_deltree(ip->i_res);
Bob Peterson2b3dcf32013-05-28 10:04:44 -04001310 ret = do_shrink(inode, oldsize, newsize);
1311out:
1312 put_write_access(inode);
1313 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001314}
1315
1316int gfs2_truncatei_resume(struct gfs2_inode *ip)
1317{
1318 int error;
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001319 error = trunc_dealloc(ip, i_size_read(&ip->i_inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001320 if (!error)
1321 error = trunc_end(ip);
1322 return error;
1323}
1324
1325int gfs2_file_dealloc(struct gfs2_inode *ip)
1326{
1327 return trunc_dealloc(ip, 0);
1328}
1329
1330/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001331 * gfs2_write_alloc_required - figure out if a write will require an allocation
1332 * @ip: the file being written to
1333 * @offset: the offset to write to
1334 * @len: the number of bytes being written
David Teiglandb3b94fa2006-01-16 16:50:04 +00001335 *
Bob Peterson461cb412010-06-24 19:21:20 -04001336 * Returns: 1 if an alloc is required, 0 otherwise
David Teiglandb3b94fa2006-01-16 16:50:04 +00001337 */
1338
Steven Whitehousecd915492006-09-04 12:49:07 -04001339int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
Bob Peterson461cb412010-06-24 19:21:20 -04001340 unsigned int len)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001341{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001342 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001343 struct buffer_head bh;
1344 unsigned int shift;
1345 u64 lblock, lblock_stop, size;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +00001346 u64 end_of_file;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001347
David Teiglandb3b94fa2006-01-16 16:50:04 +00001348 if (!len)
1349 return 0;
1350
1351 if (gfs2_is_stuffed(ip)) {
1352 if (offset + len >
1353 sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode))
Bob Peterson461cb412010-06-24 19:21:20 -04001354 return 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001355 return 0;
1356 }
1357
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001358 shift = sdp->sd_sb.sb_bsize_shift;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +00001359 BUG_ON(gfs2_is_dir(ip));
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001360 end_of_file = (i_size_read(&ip->i_inode) + sdp->sd_sb.sb_bsize - 1) >> shift;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +00001361 lblock = offset >> shift;
1362 lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift;
1363 if (lblock_stop > end_of_file)
Bob Peterson461cb412010-06-24 19:21:20 -04001364 return 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001365
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001366 size = (lblock_stop - lblock) << shift;
1367 do {
1368 bh.b_state = 0;
1369 bh.b_size = size;
1370 gfs2_block_map(&ip->i_inode, lblock, &bh, 0);
1371 if (!buffer_mapped(&bh))
Bob Peterson461cb412010-06-24 19:21:20 -04001372 return 1;
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001373 size -= bh.b_size;
1374 lblock += (bh.b_size >> ip->i_inode.i_blkbits);
1375 } while(size > 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001376
1377 return 0;
1378}
1379