blob: 61296ecbd0e20a59a8d5067169e871b1628d93a4 [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
Bob Petersonb6507382014-08-06 09:08:36 -0400362static inline unsigned int gfs2_extent_length(void *start, unsigned int len, __be64 *ptr, size_t limit, int *eob)
Steven Whitehouse30cbf182008-02-08 13:18:11 +0000363{
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,
Bob Petersonb6507382014-08-06 09:08:36 -0400452 const size_t maxlen)
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000453{
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;
Bob Petersonb6507382014-08-06 09:08:36 -0400486 dblks = min(maxlen, (size_t)(ptrs_per_blk -
487 mp->mp_list[end_of_metadata]));
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000488 if (height == ip->i_height) {
489 /* Writing into existing tree, extend tree down */
490 iblks = height - sheight;
491 state = ALLOC_GROW_DEPTH;
492 } else {
493 /* Building up tree height */
494 state = ALLOC_GROW_HEIGHT;
495 iblks = height - ip->i_height;
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500496 branch_start = metapath_branch_start(mp);
497 iblks += (height - branch_start);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000498 }
499 }
500
501 /* start of the second part of the function (state machine) */
502
503 blks = dblks + iblks;
504 i = sheight;
505 do {
Steven Whitehouse09010972009-05-20 10:48:47 +0100506 int error;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000507 n = blks - alloced;
Bob Peterson6e87ed02011-11-18 10:58:32 -0500508 error = gfs2_alloc_blocks(ip, &bn, &n, 0, NULL);
Steven Whitehouse09010972009-05-20 10:48:47 +0100509 if (error)
510 return error;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000511 alloced += n;
512 if (state != ALLOC_DATA || gfs2_is_jdata(ip))
513 gfs2_trans_add_unrevoke(sdp, bn, n);
514 switch (state) {
515 /* Growing height of tree */
516 case ALLOC_GROW_HEIGHT:
517 if (i == 1) {
518 ptr = (__be64 *)(dibh->b_data +
519 sizeof(struct gfs2_dinode));
520 zero_bn = *ptr;
521 }
522 for (; i - 1 < height - ip->i_height && n > 0; i++, n--)
523 gfs2_indirect_init(mp, ip->i_gl, i, 0, bn++);
524 if (i - 1 == height - ip->i_height) {
525 i--;
526 gfs2_buffer_copy_tail(mp->mp_bh[i],
527 sizeof(struct gfs2_meta_header),
528 dibh, sizeof(struct gfs2_dinode));
529 gfs2_buffer_clear_tail(dibh,
530 sizeof(struct gfs2_dinode) +
531 sizeof(__be64));
532 ptr = (__be64 *)(mp->mp_bh[i]->b_data +
533 sizeof(struct gfs2_meta_header));
534 *ptr = zero_bn;
535 state = ALLOC_GROW_DEPTH;
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500536 for(i = branch_start; i < height; i++) {
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000537 if (mp->mp_bh[i] == NULL)
538 break;
539 brelse(mp->mp_bh[i]);
540 mp->mp_bh[i] = NULL;
541 }
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500542 i = branch_start;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000543 }
544 if (n == 0)
545 break;
546 /* Branching from existing tree */
547 case ALLOC_GROW_DEPTH:
548 if (i > 1 && i < height)
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000549 gfs2_trans_add_meta(ip->i_gl, mp->mp_bh[i-1]);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000550 for (; i < height && n > 0; i++, n--)
551 gfs2_indirect_init(mp, ip->i_gl, i,
552 mp->mp_list[i-1], bn++);
553 if (i == height)
554 state = ALLOC_DATA;
555 if (n == 0)
556 break;
557 /* Tree complete, adding data blocks */
558 case ALLOC_DATA:
559 BUG_ON(n > dblks);
560 BUG_ON(mp->mp_bh[end_of_metadata] == NULL);
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000561 gfs2_trans_add_meta(ip->i_gl, mp->mp_bh[end_of_metadata]);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000562 dblks = n;
563 ptr = metapointer(end_of_metadata, mp);
564 dblock = bn;
565 while (n-- > 0)
566 *ptr++ = cpu_to_be64(bn++);
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500567 if (buffer_zeronew(bh_map)) {
568 ret = sb_issue_zeroout(sb, dblock, dblks,
569 GFP_NOFS);
570 if (ret) {
571 fs_err(sdp,
572 "Failed to zero data buffers\n");
573 clear_buffer_zeronew(bh_map);
574 }
575 }
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000576 break;
577 }
Steven Whitehouse07ccb7b2010-02-12 10:10:55 +0000578 } while ((state != ALLOC_DATA) || !dblock);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000579
580 ip->i_height = height;
581 gfs2_add_inode_blocks(&ip->i_inode, alloced);
582 gfs2_dinode_out(ip, mp->mp_bh[0]->b_data);
583 map_bh(bh_map, inode->i_sb, dblock);
584 bh_map->b_size = dblks << inode->i_blkbits;
585 set_buffer_new(bh_map);
586 return 0;
587}
588
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500589/**
590 * gfs2_block_map - Map a block from an inode to a disk block
591 * @inode: The inode
592 * @lblock: The logical block number
593 * @bh_map: The bh to be mapped
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000594 * @create: True if its ok to alloc blocks to satify the request
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500595 *
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000596 * Sets buffer_mapped() if successful, sets buffer_boundary() if a
597 * read of metadata will be required before the next block can be
598 * mapped. Sets buffer_new() if new blocks were allocated.
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500599 *
600 * Returns: errno
601 */
602
Bob Petersone9e1ef22007-12-10 14:13:27 -0600603int gfs2_block_map(struct inode *inode, sector_t lblock,
604 struct buffer_head *bh_map, int create)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400605{
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500606 struct gfs2_inode *ip = GFS2_I(inode);
607 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000608 unsigned int bsize = sdp->sd_sb.sb_bsize;
Bob Petersonb6507382014-08-06 09:08:36 -0400609 const size_t maxlen = bh_map->b_size >> inode->i_blkbits;
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000610 const u64 *arr = sdp->sd_heightsize;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000611 __be64 *ptr;
612 u64 size;
613 struct metapath mp;
614 int ret;
615 int eob;
616 unsigned int len;
617 struct buffer_head *bh;
618 u8 height;
619
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500620 BUG_ON(maxlen == 0);
621
Steven Whitehousedbac6712008-01-29 09:12:55 +0000622 memset(mp.mp_bh, 0, sizeof(mp.mp_bh));
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000623 bmap_lock(ip, create);
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500624 clear_buffer_mapped(bh_map);
625 clear_buffer_new(bh_map);
626 clear_buffer_boundary(bh_map);
Steven Whitehouse63997772009-06-12 08:49:20 +0100627 trace_gfs2_bmap(ip, bh_map, lblock, create, 1);
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000628 if (gfs2_is_dir(ip)) {
629 bsize = sdp->sd_jbsize;
630 arr = sdp->sd_jheightsize;
631 }
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000632
633 ret = gfs2_meta_inode_buffer(ip, &mp.mp_bh[0]);
634 if (ret)
635 goto out;
636
637 height = ip->i_height;
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500638 size = (lblock + 1) * bsize;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000639 while (size > arr[height])
640 height++;
641 find_metapath(sdp, lblock, &mp, height);
642 ret = 1;
643 if (height > ip->i_height || gfs2_is_stuffed(ip))
644 goto do_alloc;
645 ret = lookup_metapath(ip, &mp);
646 if (ret < 0)
647 goto out;
648 if (ret != ip->i_height)
649 goto do_alloc;
650 ptr = metapointer(ip->i_height - 1, &mp);
651 if (*ptr == 0)
652 goto do_alloc;
653 map_bh(bh_map, inode->i_sb, be64_to_cpu(*ptr));
654 bh = mp.mp_bh[ip->i_height - 1];
655 len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen, &eob);
656 bh_map->b_size = (len << inode->i_blkbits);
657 if (eob)
658 set_buffer_boundary(bh_map);
659 ret = 0;
660out:
Steven Whitehousedbac6712008-01-29 09:12:55 +0000661 release_metapath(&mp);
Steven Whitehouse63997772009-06-12 08:49:20 +0100662 trace_gfs2_bmap(ip, bh_map, lblock, create, ret);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000663 bmap_unlock(ip, create);
664 return ret;
665
666do_alloc:
667 /* All allocations are done here, firstly check create flag */
668 if (!create) {
669 BUG_ON(gfs2_is_stuffed(ip));
670 ret = 0;
671 goto out;
672 }
673
674 /* At this point ret is the tree depth of already allocated blocks */
675 ret = gfs2_bmap_alloc(inode, lblock, bh_map, &mp, ret, height, maxlen);
676 goto out;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400677}
678
Steven Whitehouse941e6d72008-01-28 08:47:38 +0000679/*
680 * Deprecated: do not use in new code
681 */
Steven Whitehousefd88de562006-05-05 16:59:11 -0400682int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen)
683{
Steven Whitehouse23591252006-10-13 17:25:45 -0400684 struct buffer_head bh = { .b_state = 0, .b_blocknr = 0 };
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -0400685 int ret;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400686 int create = *new;
687
688 BUG_ON(!extlen);
689 BUG_ON(!dblock);
690 BUG_ON(!new);
691
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000692 bh.b_size = 1 << (inode->i_blkbits + (create ? 0 : 5));
Bob Petersone9e1ef22007-12-10 14:13:27 -0600693 ret = gfs2_block_map(inode, lblock, &bh, create);
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -0400694 *extlen = bh.b_size >> inode->i_blkbits;
695 *dblock = bh.b_blocknr;
696 if (buffer_new(&bh))
697 *new = 1;
698 else
699 *new = 0;
700 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000701}
702
703/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000704 * do_strip - Look for a layer a particular layer of the file and strip it off
705 * @ip: the inode
706 * @dibh: the dinode buffer
707 * @bh: A buffer of pointers
708 * @top: The first pointer in the buffer
709 * @bottom: One more than the last pointer
710 * @height: the height this buffer is at
Fabian Frederickc62baf62014-05-14 18:32:31 +0200711 * @sm: a pointer to a struct strip_mine
David Teiglandb3b94fa2006-01-16 16:50:04 +0000712 *
713 * Returns: errno
714 */
715
716static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
Al Virob44b84d2006-10-14 10:46:30 -0400717 struct buffer_head *bh, __be64 *top, __be64 *bottom,
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100718 unsigned int height, struct strip_mine *sm)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000719{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400720 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000721 struct gfs2_rgrp_list rlist;
Steven Whitehousecd915492006-09-04 12:49:07 -0400722 u64 bn, bstart;
Bob Peterson4c16c362011-02-23 16:11:33 -0500723 u32 blen, btotal;
Al Virob44b84d2006-10-14 10:46:30 -0400724 __be64 *p;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000725 unsigned int rg_blocks = 0;
726 int metadata;
727 unsigned int revokes = 0;
728 int x;
Bob Peterson5e2f7d62012-04-04 22:11:16 -0400729 int error;
730
731 error = gfs2_rindex_update(sdp);
732 if (error)
733 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000734
735 if (!*top)
736 sm->sm_first = 0;
737
738 if (height != sm->sm_height)
739 return 0;
740
741 if (sm->sm_first) {
742 top++;
743 sm->sm_first = 0;
744 }
745
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000746 metadata = (height != ip->i_height - 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000747 if (metadata)
748 revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs;
Steven Whitehouse6d3117b2011-05-21 14:05:58 +0100749 else if (ip->i_depth)
750 revokes = sdp->sd_inptrs;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000751
David Teiglandb3b94fa2006-01-16 16:50:04 +0000752 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
753 bstart = 0;
754 blen = 0;
755
756 for (p = top; p < bottom; p++) {
757 if (!*p)
758 continue;
759
760 bn = be64_to_cpu(*p);
761
762 if (bstart + blen == bn)
763 blen++;
764 else {
765 if (bstart)
Steven Whitehouse70b0c362011-09-02 16:08:09 +0100766 gfs2_rlist_add(ip, &rlist, bstart);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000767
768 bstart = bn;
769 blen = 1;
770 }
771 }
772
773 if (bstart)
Steven Whitehouse70b0c362011-09-02 16:08:09 +0100774 gfs2_rlist_add(ip, &rlist, bstart);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000775 else
776 goto out; /* Nothing to do */
777
Bob Petersonfe6c9912008-01-28 11:13:02 -0600778 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000779
780 for (x = 0; x < rlist.rl_rgrps; x++) {
781 struct gfs2_rgrpd *rgd;
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500782 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100783 rg_blocks += rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000784 }
785
786 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
787 if (error)
788 goto out_rlist;
789
Bob Peterson8e2e0042012-07-19 08:12:40 -0400790 if (gfs2_rs_active(ip->i_res)) /* needs to be done with the rgrp glock held */
Bob Peterson20095212013-03-13 10:26:38 -0400791 gfs2_rs_deltree(ip->i_res);
Bob Peterson8e2e0042012-07-19 08:12:40 -0400792
David Teiglandb3b94fa2006-01-16 16:50:04 +0000793 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE +
794 RES_INDIRECT + RES_STATFS + RES_QUOTA,
795 revokes);
796 if (error)
797 goto out_rg_gunlock;
798
799 down_write(&ip->i_rw_mutex);
800
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000801 gfs2_trans_add_meta(ip->i_gl, dibh);
802 gfs2_trans_add_meta(ip->i_gl, bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000803
804 bstart = 0;
805 blen = 0;
Bob Peterson4c16c362011-02-23 16:11:33 -0500806 btotal = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000807
808 for (p = top; p < bottom; p++) {
809 if (!*p)
810 continue;
811
812 bn = be64_to_cpu(*p);
813
814 if (bstart + blen == bn)
815 blen++;
816 else {
817 if (bstart) {
Eric Sandeen46fcb2e2011-06-23 10:39:34 -0500818 __gfs2_free_blocks(ip, bstart, blen, metadata);
Bob Peterson4c16c362011-02-23 16:11:33 -0500819 btotal += blen;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000820 }
821
822 bstart = bn;
823 blen = 1;
824 }
825
826 *p = 0;
Steven Whitehouse77658aa2008-02-12 14:17:27 +0000827 gfs2_add_inode_blocks(&ip->i_inode, -1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000828 }
829 if (bstart) {
Eric Sandeen46fcb2e2011-06-23 10:39:34 -0500830 __gfs2_free_blocks(ip, bstart, blen, metadata);
Bob Peterson4c16c362011-02-23 16:11:33 -0500831 btotal += blen;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000832 }
833
Bob Peterson4c16c362011-02-23 16:11:33 -0500834 gfs2_statfs_change(sdp, 0, +btotal, 0);
835 gfs2_quota_change(ip, -(s64)btotal, ip->i_inode.i_uid,
836 ip->i_inode.i_gid);
837
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100838 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000839
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500840 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000841
842 up_write(&ip->i_rw_mutex);
843
844 gfs2_trans_end(sdp);
845
Steven Whitehousea91ea692006-09-04 12:04:26 -0400846out_rg_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000847 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400848out_rlist:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000849 gfs2_rlist_free(&rlist);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400850out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000851 return error;
852}
853
854/**
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100855 * recursive_scan - recursively scan through the end of a file
856 * @ip: the inode
857 * @dibh: the dinode buffer
858 * @mp: the path through the metadata to the point to start
859 * @height: the height the recursion is at
860 * @block: the indirect block to look at
861 * @first: 1 if this is the first block
862 * @sm: data opaque to this function to pass to @bc
863 *
864 * When this is first called @height and @block should be zero and
865 * @first should be 1.
866 *
867 * Returns: errno
868 */
869
870static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh,
871 struct metapath *mp, unsigned int height,
872 u64 block, int first, struct strip_mine *sm)
873{
874 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
875 struct buffer_head *bh = NULL;
Steven Whitehouseb99b98d2011-09-21 11:05:16 +0100876 __be64 *top, *bottom;
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100877 u64 bn;
878 int error;
879 int mh_size = sizeof(struct gfs2_meta_header);
880
881 if (!height) {
882 error = gfs2_meta_inode_buffer(ip, &bh);
883 if (error)
884 return error;
885 dibh = bh;
886
887 top = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0];
888 bottom = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + sdp->sd_diptrs;
889 } else {
Bob Petersonf2f9c812012-05-10 08:33:55 -0400890 error = gfs2_meta_indirect_buffer(ip, height, block, &bh);
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100891 if (error)
892 return error;
893
894 top = (__be64 *)(bh->b_data + mh_size) +
895 (first ? mp->mp_list[height] : 0);
896
897 bottom = (__be64 *)(bh->b_data + mh_size) + sdp->sd_inptrs;
898 }
899
900 error = do_strip(ip, dibh, bh, top, bottom, height, sm);
901 if (error)
902 goto out;
903
Bob Petersonbd5437a2011-09-15 09:59:56 -0400904 if (height < ip->i_height - 1) {
Bob Petersonbd5437a2011-09-15 09:59:56 -0400905
Steven Whitehouseb99b98d2011-09-21 11:05:16 +0100906 gfs2_metapath_ra(ip->i_gl, bh, top);
Bob Petersonbd5437a2011-09-15 09:59:56 -0400907
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100908 for (; top < bottom; top++, first = 0) {
909 if (!*top)
910 continue;
911
912 bn = be64_to_cpu(*top);
913
914 error = recursive_scan(ip, dibh, mp, height + 1, bn,
915 first, sm);
916 if (error)
917 break;
918 }
Bob Petersonbd5437a2011-09-15 09:59:56 -0400919 }
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100920out:
921 brelse(bh);
922 return error;
923}
924
925
926/**
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400927 * gfs2_block_truncate_page - Deal with zeroing out data for truncate
928 *
929 * This is partly borrowed from ext3.
930 */
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100931static int gfs2_block_truncate_page(struct address_space *mapping, loff_t from)
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400932{
933 struct inode *inode = mapping->host;
934 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400935 unsigned long index = from >> PAGE_CACHE_SHIFT;
936 unsigned offset = from & (PAGE_CACHE_SIZE-1);
937 unsigned blocksize, iblock, length, pos;
938 struct buffer_head *bh;
939 struct page *page;
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400940 int err;
941
Bob Peterson220cca22012-03-19 15:25:50 -0400942 page = find_or_create_page(mapping, index, GFP_NOFS);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400943 if (!page)
944 return 0;
945
946 blocksize = inode->i_sb->s_blocksize;
947 length = blocksize - (offset & (blocksize - 1));
948 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
949
950 if (!page_has_buffers(page))
951 create_empty_buffers(page, blocksize, 0);
952
953 /* Find the buffer that contains "offset" */
954 bh = page_buffers(page);
955 pos = blocksize;
956 while (offset >= pos) {
957 bh = bh->b_this_page;
958 iblock++;
959 pos += blocksize;
960 }
961
962 err = 0;
963
964 if (!buffer_mapped(bh)) {
Bob Petersone9e1ef22007-12-10 14:13:27 -0600965 gfs2_block_map(inode, iblock, bh, 0);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400966 /* unmapped? It's a hole - nothing to do */
967 if (!buffer_mapped(bh))
968 goto unlock;
969 }
970
971 /* Ok, it's mapped. Make sure it's up-to-date */
972 if (PageUptodate(page))
973 set_buffer_uptodate(bh);
974
975 if (!buffer_uptodate(bh)) {
976 err = -EIO;
977 ll_rw_block(READ, 1, &bh);
978 wait_on_buffer(bh);
979 /* Uhhuh. Read error. Complain and punt. */
980 if (!buffer_uptodate(bh))
981 goto unlock;
S. Wendy Cheng1875f2f2007-06-25 21:14:31 -0400982 err = 0;
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400983 }
984
Steven Whitehousebf36a712007-10-17 08:35:19 +0100985 if (!gfs2_is_writeback(ip))
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000986 gfs2_trans_add_data(ip->i_gl, bh);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400987
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800988 zero_user(page, offset, length);
Steven Whitehouse40bc9a22009-06-10 09:09:40 +0100989 mark_buffer_dirty(bh);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400990unlock:
991 unlock_page(page);
992 page_cache_release(page);
993 return err;
994}
995
Fabian Frederickc62baf62014-05-14 18:32:31 +0200996#define GFS2_JTRUNC_REVOKES 8192
997
Steven Whitehousefa731fc2012-11-13 09:50:28 +0000998/**
999 * gfs2_journaled_truncate - Wrapper for truncate_pagecache for jdata files
1000 * @inode: The inode being truncated
1001 * @oldsize: The original (larger) size
1002 * @newsize: The new smaller size
1003 *
1004 * With jdata files, we have to journal a revoke for each block which is
1005 * truncated. As a result, we need to split this into separate transactions
1006 * if the number of pages being truncated gets too large.
1007 */
1008
Steven Whitehousefa731fc2012-11-13 09:50:28 +00001009static int gfs2_journaled_truncate(struct inode *inode, u64 oldsize, u64 newsize)
1010{
1011 struct gfs2_sbd *sdp = GFS2_SB(inode);
1012 u64 max_chunk = GFS2_JTRUNC_REVOKES * sdp->sd_vfs->s_blocksize;
1013 u64 chunk;
1014 int error;
1015
1016 while (oldsize != newsize) {
1017 chunk = oldsize - newsize;
1018 if (chunk > max_chunk)
1019 chunk = max_chunk;
Kirill A. Shutemov7caef262013-09-12 15:13:56 -07001020 truncate_pagecache(inode, oldsize - chunk);
Steven Whitehousefa731fc2012-11-13 09:50:28 +00001021 oldsize -= chunk;
1022 gfs2_trans_end(sdp);
1023 error = gfs2_trans_begin(sdp, RES_DINODE, GFS2_JTRUNC_REVOKES);
1024 if (error)
1025 return error;
1026 }
1027
1028 return 0;
1029}
1030
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001031static int trunc_start(struct inode *inode, u64 oldsize, u64 newsize)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001032{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001033 struct gfs2_inode *ip = GFS2_I(inode);
1034 struct gfs2_sbd *sdp = GFS2_SB(inode);
1035 struct address_space *mapping = inode->i_mapping;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001036 struct buffer_head *dibh;
1037 int journaled = gfs2_is_jdata(ip);
1038 int error;
1039
Steven Whitehousefa731fc2012-11-13 09:50:28 +00001040 if (journaled)
1041 error = gfs2_trans_begin(sdp, RES_DINODE + RES_JDATA, GFS2_JTRUNC_REVOKES);
1042 else
1043 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001044 if (error)
1045 return error;
1046
1047 error = gfs2_meta_inode_buffer(ip, &dibh);
1048 if (error)
1049 goto out;
1050
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001051 gfs2_trans_add_meta(ip->i_gl, dibh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001052
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001053 if (gfs2_is_stuffed(ip)) {
1054 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + newsize);
1055 } else {
1056 if (newsize & (u64)(sdp->sd_sb.sb_bsize - 1)) {
1057 error = gfs2_block_truncate_page(mapping, newsize);
1058 if (error)
1059 goto out_brelse;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001060 }
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001061 ip->i_diskflags |= GFS2_DIF_TRUNC_IN_PROG;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001062 }
1063
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001064 i_size_write(inode, newsize);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001065 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
1066 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001067
Steven Whitehousefa731fc2012-11-13 09:50:28 +00001068 if (journaled)
1069 error = gfs2_journaled_truncate(inode, oldsize, newsize);
1070 else
Kirill A. Shutemov7caef262013-09-12 15:13:56 -07001071 truncate_pagecache(inode, newsize);
Steven Whitehousefa731fc2012-11-13 09:50:28 +00001072
1073 if (error) {
1074 brelse(dibh);
1075 return error;
1076 }
1077
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001078out_brelse:
1079 brelse(dibh);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001080out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001081 gfs2_trans_end(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001082 return error;
1083}
1084
Steven Whitehousecd915492006-09-04 12:49:07 -04001085static int trunc_dealloc(struct gfs2_inode *ip, u64 size)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001086{
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +00001087 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouseecc30c72008-01-28 10:37:35 +00001088 unsigned int height = ip->i_height;
Steven Whitehousecd915492006-09-04 12:49:07 -04001089 u64 lblock;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001090 struct metapath mp;
1091 int error;
1092
1093 if (!size)
1094 lblock = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +00001095 else
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +00001096 lblock = (size - 1) >> sdp->sd_sb.sb_bsize_shift;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001097
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +00001098 find_metapath(sdp, lblock, &mp, ip->i_height);
Bob Peterson5407e242012-05-18 09:28:23 -04001099 error = gfs2_rindex_update(sdp);
1100 if (error)
1101 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001102
Eric W. Biedermanf4108a62013-01-31 17:49:26 -08001103 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001104 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -04001105 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001106
1107 while (height--) {
1108 struct strip_mine sm;
1109 sm.sm_first = !!size;
1110 sm.sm_height = height;
1111
Steven Whitehoused56fa8a2011-09-02 12:43:41 +01001112 error = recursive_scan(ip, NULL, &mp, 0, 0, 1, &sm);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001113 if (error)
1114 break;
1115 }
1116
1117 gfs2_quota_unhold(ip);
1118
David Teiglandb3b94fa2006-01-16 16:50:04 +00001119 return error;
1120}
1121
1122static int trunc_end(struct gfs2_inode *ip)
1123{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001124 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001125 struct buffer_head *dibh;
1126 int error;
1127
1128 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1129 if (error)
1130 return error;
1131
1132 down_write(&ip->i_rw_mutex);
1133
1134 error = gfs2_meta_inode_buffer(ip, &dibh);
1135 if (error)
1136 goto out;
1137
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001138 if (!i_size_read(&ip->i_inode)) {
Steven Whitehouseecc30c72008-01-28 10:37:35 +00001139 ip->i_height = 0;
Steven Whitehousece276b02008-02-06 09:25:45 +00001140 ip->i_goal = ip->i_no_addr;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001141 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
Steven Whitehouse45138992013-01-28 09:30:07 +00001142 gfs2_ordered_del_inode(ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001143 }
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001144 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001145 ip->i_diskflags &= ~GFS2_DIF_TRUNC_IN_PROG;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001146
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001147 gfs2_trans_add_meta(ip->i_gl, dibh);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001148 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001149 brelse(dibh);
1150
Steven Whitehousea91ea692006-09-04 12:04:26 -04001151out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001152 up_write(&ip->i_rw_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001153 gfs2_trans_end(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001154 return error;
1155}
1156
1157/**
1158 * do_shrink - make a file smaller
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001159 * @inode: the inode
1160 * @oldsize: the current inode size
1161 * @newsize: the size to make the file
David Teiglandb3b94fa2006-01-16 16:50:04 +00001162 *
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001163 * Called with an exclusive lock on @inode. The @size must
1164 * be equal to or smaller than the current inode size.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001165 *
1166 * Returns: errno
1167 */
1168
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001169static int do_shrink(struct inode *inode, u64 oldsize, u64 newsize)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001170{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001171 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001172 int error;
1173
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001174 error = trunc_start(inode, oldsize, newsize);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001175 if (error < 0)
1176 return error;
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001177 if (gfs2_is_stuffed(ip))
David Teiglandb3b94fa2006-01-16 16:50:04 +00001178 return 0;
1179
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001180 error = trunc_dealloc(ip, newsize);
1181 if (error == 0)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001182 error = trunc_end(ip);
1183
1184 return error;
1185}
1186
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001187void gfs2_trim_blocks(struct inode *inode)
Wendy Chenga13b8c52007-08-20 09:29:53 -04001188{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001189 u64 size = inode->i_size;
1190 int ret;
1191
1192 ret = do_shrink(inode, size, size);
1193 WARN_ON(ret != 0);
1194}
1195
1196/**
1197 * do_grow - Touch and update inode size
1198 * @inode: The inode
1199 * @size: The new size
1200 *
1201 * This function updates the timestamps on the inode and
1202 * may also increase the size of the inode. This function
1203 * must not be called with @size any smaller than the current
1204 * inode size.
1205 *
1206 * Although it is not strictly required to unstuff files here,
1207 * earlier versions of GFS2 have a bug in the stuffed file reading
1208 * code which will result in a buffer overrun if the size is larger
1209 * than the max stuffed file size. In order to prevent this from
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001210 * occurring, such files are unstuffed, but in other cases we can
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001211 * just update the inode size directly.
1212 *
1213 * Returns: 0 on success, or -ve on error
1214 */
1215
1216static int do_grow(struct inode *inode, u64 size)
1217{
1218 struct gfs2_inode *ip = GFS2_I(inode);
1219 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse7b9cff42013-10-02 11:13:25 +01001220 struct gfs2_alloc_parms ap = { .target = 1, };
Wendy Chenga13b8c52007-08-20 09:29:53 -04001221 struct buffer_head *dibh;
1222 int error;
Bob Peterson2f7ee352012-04-12 09:19:30 -04001223 int unstuff = 0;
Wendy Chenga13b8c52007-08-20 09:29:53 -04001224
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001225 if (gfs2_is_stuffed(ip) &&
1226 (size > (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)))) {
Abhi Dasb8fbf472015-03-18 12:03:41 -05001227 error = gfs2_quota_lock_check(ip, &ap);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001228 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -04001229 return error;
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001230
Steven Whitehouse7b9cff42013-10-02 11:13:25 +01001231 error = gfs2_inplace_reserve(ip, &ap);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001232 if (error)
1233 goto do_grow_qunlock;
Bob Peterson2f7ee352012-04-12 09:19:30 -04001234 unstuff = 1;
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001235 }
1236
Bob Petersona01aedf2013-06-27 12:47:51 -04001237 error = gfs2_trans_begin(sdp, RES_DINODE + RES_STATFS + RES_RG_BIT +
1238 (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF ?
1239 0 : RES_QUOTA), 0);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001240 if (error)
1241 goto do_grow_release;
1242
Bob Peterson2f7ee352012-04-12 09:19:30 -04001243 if (unstuff) {
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001244 error = gfs2_unstuff_dinode(ip, NULL);
1245 if (error)
1246 goto do_end_trans;
1247 }
Wendy Chenga13b8c52007-08-20 09:29:53 -04001248
1249 error = gfs2_meta_inode_buffer(ip, &dibh);
1250 if (error)
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001251 goto do_end_trans;
Wendy Chenga13b8c52007-08-20 09:29:53 -04001252
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001253 i_size_write(inode, size);
Wendy Chenga13b8c52007-08-20 09:29:53 -04001254 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse350a9b02012-12-14 12:36:02 +00001255 gfs2_trans_add_meta(ip->i_gl, dibh);
Wendy Chenga13b8c52007-08-20 09:29:53 -04001256 gfs2_dinode_out(ip, dibh->b_data);
1257 brelse(dibh);
1258
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001259do_end_trans:
Wendy Chenga13b8c52007-08-20 09:29:53 -04001260 gfs2_trans_end(sdp);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001261do_grow_release:
Bob Peterson2f7ee352012-04-12 09:19:30 -04001262 if (unstuff) {
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001263 gfs2_inplace_release(ip);
1264do_grow_qunlock:
1265 gfs2_quota_unlock(ip);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001266 }
Wendy Chenga13b8c52007-08-20 09:29:53 -04001267 return error;
1268}
1269
David Teiglandb3b94fa2006-01-16 16:50:04 +00001270/**
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001271 * gfs2_setattr_size - make a file a given size
1272 * @inode: the inode
1273 * @newsize: the size to make the file
David Teiglandb3b94fa2006-01-16 16:50:04 +00001274 *
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001275 * The file size can grow, shrink, or stay the same size. This
1276 * is called holding i_mutex and an exclusive glock on the inode
1277 * in question.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001278 *
1279 * Returns: errno
1280 */
1281
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001282int gfs2_setattr_size(struct inode *inode, u64 newsize)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001283{
Steven Whitehouseaf5c2692013-09-27 12:49:33 +01001284 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001285 int ret;
1286 u64 oldsize;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001287
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001288 BUG_ON(!S_ISREG(inode->i_mode));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001289
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001290 ret = inode_newsize_ok(inode, newsize);
1291 if (ret)
1292 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001293
Bob Peterson2b3dcf32013-05-28 10:04:44 -04001294 ret = get_write_access(inode);
1295 if (ret)
1296 return ret;
1297
Christoph Hellwig562c72a2011-06-24 14:29:45 -04001298 inode_dio_wait(inode);
1299
Steven Whitehouseaf5c2692013-09-27 12:49:33 +01001300 ret = gfs2_rs_alloc(ip);
Bob Petersond2b47cf2013-02-01 12:03:02 -05001301 if (ret)
Bob Peterson2b3dcf32013-05-28 10:04:44 -04001302 goto out;
Bob Petersond2b47cf2013-02-01 12:03:02 -05001303
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001304 oldsize = inode->i_size;
Bob Peterson2b3dcf32013-05-28 10:04:44 -04001305 if (newsize >= oldsize) {
1306 ret = do_grow(inode, newsize);
1307 goto out;
1308 }
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001309
Steven Whitehouseaf5c2692013-09-27 12:49:33 +01001310 gfs2_rs_deltree(ip->i_res);
Bob Peterson2b3dcf32013-05-28 10:04:44 -04001311 ret = do_shrink(inode, oldsize, newsize);
1312out:
1313 put_write_access(inode);
1314 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001315}
1316
1317int gfs2_truncatei_resume(struct gfs2_inode *ip)
1318{
1319 int error;
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001320 error = trunc_dealloc(ip, i_size_read(&ip->i_inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001321 if (!error)
1322 error = trunc_end(ip);
1323 return error;
1324}
1325
1326int gfs2_file_dealloc(struct gfs2_inode *ip)
1327{
1328 return trunc_dealloc(ip, 0);
1329}
1330
1331/**
Steven Whitehouseb50f2272014-03-03 13:35:57 +00001332 * gfs2_free_journal_extents - Free cached journal bmap info
1333 * @jd: The journal
1334 *
1335 */
1336
1337void gfs2_free_journal_extents(struct gfs2_jdesc *jd)
1338{
1339 struct gfs2_journal_extent *jext;
1340
1341 while(!list_empty(&jd->extent_list)) {
1342 jext = list_entry(jd->extent_list.next, struct gfs2_journal_extent, list);
1343 list_del(&jext->list);
1344 kfree(jext);
1345 }
1346}
1347
1348/**
1349 * gfs2_add_jextent - Add or merge a new extent to extent cache
1350 * @jd: The journal descriptor
1351 * @lblock: The logical block at start of new extent
Fabian Frederickc62baf62014-05-14 18:32:31 +02001352 * @dblock: The physical block at start of new extent
Steven Whitehouseb50f2272014-03-03 13:35:57 +00001353 * @blocks: Size of extent in fs blocks
1354 *
1355 * Returns: 0 on success or -ENOMEM
1356 */
1357
1358static int gfs2_add_jextent(struct gfs2_jdesc *jd, u64 lblock, u64 dblock, u64 blocks)
1359{
1360 struct gfs2_journal_extent *jext;
1361
1362 if (!list_empty(&jd->extent_list)) {
1363 jext = list_entry(jd->extent_list.prev, struct gfs2_journal_extent, list);
1364 if ((jext->dblock + jext->blocks) == dblock) {
1365 jext->blocks += blocks;
1366 return 0;
1367 }
1368 }
1369
1370 jext = kzalloc(sizeof(struct gfs2_journal_extent), GFP_NOFS);
1371 if (jext == NULL)
1372 return -ENOMEM;
1373 jext->dblock = dblock;
1374 jext->lblock = lblock;
1375 jext->blocks = blocks;
1376 list_add_tail(&jext->list, &jd->extent_list);
1377 jd->nr_extents++;
1378 return 0;
1379}
1380
1381/**
1382 * gfs2_map_journal_extents - Cache journal bmap info
1383 * @sdp: The super block
1384 * @jd: The journal to map
1385 *
1386 * Create a reusable "extent" mapping from all logical
1387 * blocks to all physical blocks for the given journal. This will save
1388 * us time when writing journal blocks. Most journals will have only one
1389 * extent that maps all their logical blocks. That's because gfs2.mkfs
1390 * arranges the journal blocks sequentially to maximize performance.
1391 * So the extent would map the first block for the entire file length.
1392 * However, gfs2_jadd can happen while file activity is happening, so
1393 * those journals may not be sequential. Less likely is the case where
1394 * the users created their own journals by mounting the metafs and
1395 * laying it out. But it's still possible. These journals might have
1396 * several extents.
1397 *
1398 * Returns: 0 on success, or error on failure
1399 */
1400
1401int gfs2_map_journal_extents(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd)
1402{
1403 u64 lblock = 0;
1404 u64 lblock_stop;
1405 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
1406 struct buffer_head bh;
1407 unsigned int shift = sdp->sd_sb.sb_bsize_shift;
1408 u64 size;
1409 int rc;
1410
1411 lblock_stop = i_size_read(jd->jd_inode) >> shift;
1412 size = (lblock_stop - lblock) << shift;
1413 jd->nr_extents = 0;
1414 WARN_ON(!list_empty(&jd->extent_list));
1415
1416 do {
1417 bh.b_state = 0;
1418 bh.b_blocknr = 0;
1419 bh.b_size = size;
1420 rc = gfs2_block_map(jd->jd_inode, lblock, &bh, 0);
1421 if (rc || !buffer_mapped(&bh))
1422 goto fail;
1423 rc = gfs2_add_jextent(jd, lblock, bh.b_blocknr, bh.b_size >> shift);
1424 if (rc)
1425 goto fail;
1426 size -= bh.b_size;
1427 lblock += (bh.b_size >> ip->i_inode.i_blkbits);
1428 } while(size > 0);
1429
1430 fs_info(sdp, "journal %d mapped with %u extents\n", jd->jd_jid,
1431 jd->nr_extents);
1432 return 0;
1433
1434fail:
1435 fs_warn(sdp, "error %d mapping journal %u at offset %llu (extent %u)\n",
1436 rc, jd->jd_jid,
1437 (unsigned long long)(i_size_read(jd->jd_inode) - size),
1438 jd->nr_extents);
1439 fs_warn(sdp, "bmap=%d lblock=%llu block=%llu, state=0x%08lx, size=%llu\n",
1440 rc, (unsigned long long)lblock, (unsigned long long)bh.b_blocknr,
1441 bh.b_state, (unsigned long long)bh.b_size);
1442 gfs2_free_journal_extents(jd);
1443 return rc;
1444}
1445
1446/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001447 * gfs2_write_alloc_required - figure out if a write will require an allocation
1448 * @ip: the file being written to
1449 * @offset: the offset to write to
1450 * @len: the number of bytes being written
David Teiglandb3b94fa2006-01-16 16:50:04 +00001451 *
Bob Peterson461cb412010-06-24 19:21:20 -04001452 * Returns: 1 if an alloc is required, 0 otherwise
David Teiglandb3b94fa2006-01-16 16:50:04 +00001453 */
1454
Steven Whitehousecd915492006-09-04 12:49:07 -04001455int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
Bob Peterson461cb412010-06-24 19:21:20 -04001456 unsigned int len)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001457{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001458 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001459 struct buffer_head bh;
1460 unsigned int shift;
1461 u64 lblock, lblock_stop, size;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +00001462 u64 end_of_file;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001463
David Teiglandb3b94fa2006-01-16 16:50:04 +00001464 if (!len)
1465 return 0;
1466
1467 if (gfs2_is_stuffed(ip)) {
1468 if (offset + len >
1469 sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode))
Bob Peterson461cb412010-06-24 19:21:20 -04001470 return 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001471 return 0;
1472 }
1473
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001474 shift = sdp->sd_sb.sb_bsize_shift;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +00001475 BUG_ON(gfs2_is_dir(ip));
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001476 end_of_file = (i_size_read(&ip->i_inode) + sdp->sd_sb.sb_bsize - 1) >> shift;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +00001477 lblock = offset >> shift;
1478 lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift;
1479 if (lblock_stop > end_of_file)
Bob Peterson461cb412010-06-24 19:21:20 -04001480 return 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001481
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001482 size = (lblock_stop - lblock) << shift;
1483 do {
1484 bh.b_state = 0;
1485 bh.b_size = size;
1486 gfs2_block_map(&ip->i_inode, lblock, &bh, 0);
1487 if (!buffer_mapped(&bh))
Bob Peterson461cb412010-06-24 19:21:20 -04001488 return 1;
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001489 size -= bh.b_size;
1490 lblock += (bh.b_size >> ip->i_inode.i_blkbits);
1491 } while(size > 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001492
1493 return 0;
1494}
1495