blob: 49cd7dd4a9fa882781fa895aff8c19401c170aad [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"
Bob Peterson4c16c362011-02-23 16:11:33 -050025#include "super.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000026#include "trans.h"
Steven Whitehouse18ec7d52006-02-08 11:50:51 +000027#include "dir.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050028#include "util.h"
Steven Whitehouse63997772009-06-12 08:49:20 +010029#include "trace_gfs2.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000030
31/* This doesn't need to be that large as max 64 bit pointers in a 4k
32 * block is 512, so __u16 is fine for that. It saves stack space to
33 * keep it small.
34 */
35struct metapath {
Steven Whitehousedbac6712008-01-29 09:12:55 +000036 struct buffer_head *mp_bh[GFS2_MAX_META_HEIGHT];
David Teiglandb3b94fa2006-01-16 16:50:04 +000037 __u16 mp_list[GFS2_MAX_META_HEIGHT];
38};
39
David Teiglandb3b94fa2006-01-16 16:50:04 +000040struct strip_mine {
41 int sm_first;
42 unsigned int sm_height;
43};
44
45/**
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040046 * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
47 * @ip: the inode
48 * @dibh: the dinode buffer
49 * @block: the block number that was allocated
Steven Whitehouseff8f33c2010-08-11 09:37:53 +010050 * @page: The (optional) page. This is looked up if @page is NULL
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040051 *
52 * Returns: errno
53 */
54
55static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
Steven Whitehousecd915492006-09-04 12:49:07 -040056 u64 block, struct page *page)
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040057{
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040058 struct inode *inode = &ip->i_inode;
59 struct buffer_head *bh;
60 int release = 0;
61
62 if (!page || page->index) {
Bob Peterson220cca22012-03-19 15:25:50 -040063 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040064 if (!page)
65 return -ENOMEM;
66 release = 1;
67 }
68
69 if (!PageUptodate(page)) {
70 void *kaddr = kmap(page);
Steven Whitehouse602c89d2010-03-25 14:32:43 +000071 u64 dsize = i_size_read(inode);
72
73 if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode)))
74 dsize = dibh->b_size - sizeof(struct gfs2_dinode);
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040075
Steven Whitehouse602c89d2010-03-25 14:32:43 +000076 memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
77 memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize);
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040078 kunmap(page);
79
80 SetPageUptodate(page);
81 }
82
83 if (!page_has_buffers(page))
84 create_empty_buffers(page, 1 << inode->i_blkbits,
85 (1 << BH_Uptodate));
86
87 bh = page_buffers(page);
88
89 if (!buffer_mapped(bh))
90 map_bh(bh, inode->i_sb, block);
91
92 set_buffer_uptodate(bh);
Steven Whitehouseeaf96522007-08-27 09:49:37 +010093 if (!gfs2_is_jdata(ip))
94 mark_buffer_dirty(bh);
Steven Whitehousebf36a712007-10-17 08:35:19 +010095 if (!gfs2_is_writeback(ip))
Bob Peterson84754872007-09-02 10:55:29 +010096 gfs2_trans_add_bh(ip->i_gl, bh, 0);
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040097
98 if (release) {
99 unlock_page(page);
100 page_cache_release(page);
101 }
102
103 return 0;
104}
105
106/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000107 * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
108 * @ip: The GFS2 inode to unstuff
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100109 * @page: The (optional) page. This is looked up if the @page is NULL
David Teiglandb3b94fa2006-01-16 16:50:04 +0000110 *
111 * This routine unstuffs a dinode and returns it to a "normal" state such
112 * that the height can be grown in the traditional way.
113 *
114 * Returns: errno
115 */
116
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400117int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000118{
119 struct buffer_head *bh, *dibh;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400120 struct gfs2_dinode *di;
Steven Whitehousecd915492006-09-04 12:49:07 -0400121 u64 block = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000122 int isdir = gfs2_is_dir(ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000123 int error;
124
125 down_write(&ip->i_rw_mutex);
126
127 error = gfs2_meta_inode_buffer(ip, &dibh);
128 if (error)
129 goto out;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400130
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100131 if (i_size_read(&ip->i_inode)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000132 /* Get a free block, fill it with the stuffed data,
133 and write it out to disk */
134
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000135 unsigned int n = 1;
Bob Peterson6e87ed02011-11-18 10:58:32 -0500136 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
Steven Whitehouse09010972009-05-20 10:48:47 +0100137 if (error)
138 goto out_brelse;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000139 if (isdir) {
Steven Whitehouse5731be52008-02-01 13:16:55 +0000140 gfs2_trans_add_unrevoke(GFS2_SB(&ip->i_inode), block, 1);
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400141 error = gfs2_dir_get_new_buffer(ip, block, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000142 if (error)
143 goto out_brelse;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400144 gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_meta_header),
David Teiglandb3b94fa2006-01-16 16:50:04 +0000145 dibh, sizeof(struct gfs2_dinode));
146 brelse(bh);
147 } else {
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400148 error = gfs2_unstuffer_page(ip, dibh, block, page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000149 if (error)
150 goto out_brelse;
151 }
152 }
153
154 /* Set up the pointer to the new block */
155
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000156 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400157 di = (struct gfs2_dinode *)dibh->b_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000158 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
159
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100160 if (i_size_read(&ip->i_inode)) {
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400161 *(__be64 *)(di + 1) = cpu_to_be64(block);
Steven Whitehouse77658aa2008-02-12 14:17:27 +0000162 gfs2_add_inode_blocks(&ip->i_inode, 1);
163 di->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000164 }
165
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000166 ip->i_height = 1;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400167 di->di_height = cpu_to_be16(1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000168
Steven Whitehousea91ea692006-09-04 12:04:26 -0400169out_brelse:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000170 brelse(dibh);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400171out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000172 up_write(&ip->i_rw_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000173 return error;
174}
175
David Teiglandb3b94fa2006-01-16 16:50:04 +0000176
177/**
178 * find_metapath - Find path through the metadata tree
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000179 * @sdp: The superblock
David Teiglandb3b94fa2006-01-16 16:50:04 +0000180 * @mp: The metapath to return the result in
181 * @block: The disk block to look up
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000182 * @height: The pre-calculated height of the metadata tree
David Teiglandb3b94fa2006-01-16 16:50:04 +0000183 *
184 * This routine returns a struct metapath structure that defines a path
185 * through the metadata of inode "ip" to get to block "block".
186 *
187 * Example:
188 * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a
189 * filesystem with a blocksize of 4096.
190 *
191 * find_metapath() would return a struct metapath structure set to:
192 * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48,
193 * and mp_list[2] = 165.
194 *
195 * That means that in order to get to the block containing the byte at
196 * offset 101342453, we would load the indirect block pointed to by pointer
197 * 0 in the dinode. We would then load the indirect block pointed to by
198 * pointer 48 in that indirect block. We would then load the data block
199 * pointed to by pointer 165 in that indirect block.
200 *
201 * ----------------------------------------
202 * | Dinode | |
203 * | | 4|
204 * | |0 1 2 3 4 5 9|
205 * | | 6|
206 * ----------------------------------------
207 * |
208 * |
209 * V
210 * ----------------------------------------
211 * | Indirect Block |
212 * | 5|
213 * | 4 4 4 4 4 5 5 1|
214 * |0 5 6 7 8 9 0 1 2|
215 * ----------------------------------------
216 * |
217 * |
218 * V
219 * ----------------------------------------
220 * | Indirect Block |
221 * | 1 1 1 1 1 5|
222 * | 6 6 6 6 6 1|
223 * |0 3 4 5 6 7 2|
224 * ----------------------------------------
225 * |
226 * |
227 * V
228 * ----------------------------------------
229 * | Data block containing offset |
230 * | 101342453 |
231 * | |
232 * | |
233 * ----------------------------------------
234 *
235 */
236
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000237static void find_metapath(const struct gfs2_sbd *sdp, u64 block,
238 struct metapath *mp, unsigned int height)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000239{
David Teiglandb3b94fa2006-01-16 16:50:04 +0000240 unsigned int i;
241
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000242 for (i = height; i--;)
Bob Peterson7eabb772008-01-28 11:24:35 -0600243 mp->mp_list[i] = do_div(block, sdp->sd_inptrs);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000244
245}
246
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500247static inline unsigned int metapath_branch_start(const struct metapath *mp)
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000248{
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500249 if (mp->mp_list[0] == 0)
250 return 2;
251 return 1;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000252}
253
David Teiglandb3b94fa2006-01-16 16:50:04 +0000254/**
255 * metapointer - Return pointer to start of metadata in a buffer
David Teiglandb3b94fa2006-01-16 16:50:04 +0000256 * @height: The metadata height (0 = dinode)
257 * @mp: The metapath
258 *
259 * Return a pointer to the block number of the next height of the metadata
260 * tree given a buffer containing the pointer to the current height of the
261 * metadata tree.
262 */
263
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000264static inline __be64 *metapointer(unsigned int height, const struct metapath *mp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000265{
Steven Whitehousedbac6712008-01-29 09:12:55 +0000266 struct buffer_head *bh = mp->mp_bh[height];
David Teiglandb3b94fa2006-01-16 16:50:04 +0000267 unsigned int head_size = (height > 0) ?
268 sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000269 return ((__be64 *)(bh->b_data + head_size)) + mp->mp_list[height];
David Teiglandb3b94fa2006-01-16 16:50:04 +0000270}
271
Steven Whitehouseb99b98d2011-09-21 11:05:16 +0100272static void gfs2_metapath_ra(struct gfs2_glock *gl,
273 const struct buffer_head *bh, const __be64 *pos)
274{
275 struct buffer_head *rabh;
276 const __be64 *endp = (const __be64 *)(bh->b_data + bh->b_size);
277 const __be64 *t;
278
279 for (t = pos; t < endp; t++) {
280 if (!*t)
281 continue;
282
283 rabh = gfs2_getbuf(gl, be64_to_cpu(*t), CREATE);
284 if (trylock_buffer(rabh)) {
285 if (!buffer_uptodate(rabh)) {
286 rabh->b_end_io = end_buffer_read_sync;
287 submit_bh(READA | REQ_META, rabh);
288 continue;
289 }
290 unlock_buffer(rabh);
291 }
292 brelse(rabh);
293 }
294}
295
David Teiglandb3b94fa2006-01-16 16:50:04 +0000296/**
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000297 * lookup_metapath - Walk the metadata tree to a specific point
298 * @ip: The inode
David Teiglandb3b94fa2006-01-16 16:50:04 +0000299 * @mp: The metapath
David Teiglandb3b94fa2006-01-16 16:50:04 +0000300 *
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000301 * Assumes that the inode's buffer has already been looked up and
302 * hooked onto mp->mp_bh[0] and that the metapath has been initialised
303 * by find_metapath().
David Teiglandb3b94fa2006-01-16 16:50:04 +0000304 *
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000305 * If this function encounters part of the tree which has not been
306 * allocated, it returns the current height of the tree at the point
307 * at which it found the unallocated block. Blocks which are found are
308 * added to the mp->mp_bh[] list.
309 *
310 * Returns: error or height of metadata tree
David Teiglandb3b94fa2006-01-16 16:50:04 +0000311 */
312
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000313static int lookup_metapath(struct gfs2_inode *ip, struct metapath *mp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000314{
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000315 unsigned int end_of_metadata = ip->i_height - 1;
316 unsigned int x;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000317 __be64 *ptr;
318 u64 dblock;
Steven Whitehousee23159d2008-02-12 14:48:39 +0000319 int ret;
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000320
321 for (x = 0; x < end_of_metadata; x++) {
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000322 ptr = metapointer(x, mp);
323 dblock = be64_to_cpu(*ptr);
324 if (!dblock)
325 return x + 1;
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000326
Bob Petersonf2f9c812012-05-10 08:33:55 -0400327 ret = gfs2_meta_indirect_buffer(ip, x+1, dblock, &mp->mp_bh[x+1]);
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000328 if (ret)
329 return ret;
330 }
331
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000332 return ip->i_height;
Steven Whitehousedbac6712008-01-29 09:12:55 +0000333}
334
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000335static inline void release_metapath(struct metapath *mp)
Steven Whitehousedbac6712008-01-29 09:12:55 +0000336{
337 int i;
338
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000339 for (i = 0; i < GFS2_MAX_META_HEIGHT; i++) {
340 if (mp->mp_bh[i] == NULL)
341 break;
342 brelse(mp->mp_bh[i]);
343 }
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000344}
345
Steven Whitehouse30cbf182008-02-08 13:18:11 +0000346/**
347 * gfs2_extent_length - Returns length of an extent of blocks
348 * @start: Start of the buffer
349 * @len: Length of the buffer in bytes
350 * @ptr: Current position in the buffer
351 * @limit: Max extent length to return (0 = unlimited)
352 * @eob: Set to 1 if we hit "end of block"
353 *
354 * If the first block is zero (unallocated) it will return the number of
355 * unallocated blocks in the extent, otherwise it will return the number
356 * of contiguous blocks in the extent.
357 *
358 * Returns: The length of the extent (minimum of one block)
359 */
360
361static inline unsigned int gfs2_extent_length(void *start, unsigned int len, __be64 *ptr, unsigned limit, int *eob)
362{
363 const __be64 *end = (start + len);
364 const __be64 *first = ptr;
365 u64 d = be64_to_cpu(*ptr);
366
367 *eob = 0;
368 do {
369 ptr++;
370 if (ptr >= end)
371 break;
372 if (limit && --limit == 0)
373 break;
374 if (d)
375 d++;
376 } while(be64_to_cpu(*ptr) == d);
377 if (ptr >= end)
378 *eob = 1;
379 return (ptr - first);
380}
381
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000382static inline void bmap_lock(struct gfs2_inode *ip, int create)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400383{
Steven Whitehousefd88de562006-05-05 16:59:11 -0400384 if (create)
385 down_write(&ip->i_rw_mutex);
386 else
387 down_read(&ip->i_rw_mutex);
388}
389
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000390static inline void bmap_unlock(struct gfs2_inode *ip, int create)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400391{
David Teiglandb3b94fa2006-01-16 16:50:04 +0000392 if (create)
393 up_write(&ip->i_rw_mutex);
394 else
395 up_read(&ip->i_rw_mutex);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400396}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000397
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000398static inline __be64 *gfs2_indirect_init(struct metapath *mp,
399 struct gfs2_glock *gl, unsigned int i,
400 unsigned offset, u64 bn)
401{
402 __be64 *ptr = (__be64 *)(mp->mp_bh[i - 1]->b_data +
403 ((i > 1) ? sizeof(struct gfs2_meta_header) :
404 sizeof(struct gfs2_dinode)));
405 BUG_ON(i < 1);
406 BUG_ON(mp->mp_bh[i] != NULL);
407 mp->mp_bh[i] = gfs2_meta_new(gl, bn);
408 gfs2_trans_add_bh(gl, mp->mp_bh[i], 1);
409 gfs2_metatype_set(mp->mp_bh[i], GFS2_METATYPE_IN, GFS2_FORMAT_IN);
410 gfs2_buffer_clear_tail(mp->mp_bh[i], sizeof(struct gfs2_meta_header));
411 ptr += offset;
412 *ptr = cpu_to_be64(bn);
413 return ptr;
414}
415
416enum alloc_state {
417 ALLOC_DATA = 0,
418 ALLOC_GROW_DEPTH = 1,
419 ALLOC_GROW_HEIGHT = 2,
420 /* ALLOC_UNSTUFF = 3, TBD and rather complicated */
421};
422
423/**
424 * gfs2_bmap_alloc - Build a metadata tree of the requested height
425 * @inode: The GFS2 inode
426 * @lblock: The logical starting block of the extent
427 * @bh_map: This is used to return the mapping details
428 * @mp: The metapath
429 * @sheight: The starting height (i.e. whats already mapped)
430 * @height: The height to build to
431 * @maxlen: The max number of data blocks to alloc
432 *
433 * In this routine we may have to alloc:
434 * i) Indirect blocks to grow the metadata tree height
435 * ii) Indirect blocks to fill in lower part of the metadata tree
436 * iii) Data blocks
437 *
438 * The function is in two parts. The first part works out the total
439 * number of blocks which we need. The second part does the actual
440 * allocation asking for an extent at a time (if enough contiguous free
441 * blocks are available, there will only be one request per bmap call)
442 * and uses the state machine to initialise the blocks in order.
443 *
444 * Returns: errno on error
445 */
446
447static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
448 struct buffer_head *bh_map, struct metapath *mp,
449 const unsigned int sheight,
450 const unsigned int height,
451 const unsigned int maxlen)
452{
453 struct gfs2_inode *ip = GFS2_I(inode);
454 struct gfs2_sbd *sdp = GFS2_SB(inode);
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500455 struct super_block *sb = sdp->sd_vfs;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000456 struct buffer_head *dibh = mp->mp_bh[0];
457 u64 bn, dblock = 0;
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500458 unsigned n, i, blks, alloced = 0, iblks = 0, branch_start = 0;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000459 unsigned dblks = 0;
460 unsigned ptrs_per_blk;
461 const unsigned end_of_metadata = height - 1;
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500462 int ret;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000463 int eob = 0;
464 enum alloc_state state;
465 __be64 *ptr;
466 __be64 zero_bn = 0;
467
468 BUG_ON(sheight < 1);
469 BUG_ON(dibh == NULL);
470
471 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
472
473 if (height == sheight) {
474 struct buffer_head *bh;
475 /* Bottom indirect block exists, find unalloced extent size */
476 ptr = metapointer(end_of_metadata, mp);
477 bh = mp->mp_bh[end_of_metadata];
478 dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen,
479 &eob);
480 BUG_ON(dblks < 1);
481 state = ALLOC_DATA;
482 } else {
483 /* Need to allocate indirect blocks */
484 ptrs_per_blk = height > 1 ? sdp->sd_inptrs : sdp->sd_diptrs;
485 dblks = min(maxlen, ptrs_per_blk - mp->mp_list[end_of_metadata]);
486 if (height == ip->i_height) {
487 /* Writing into existing tree, extend tree down */
488 iblks = height - sheight;
489 state = ALLOC_GROW_DEPTH;
490 } else {
491 /* Building up tree height */
492 state = ALLOC_GROW_HEIGHT;
493 iblks = height - ip->i_height;
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500494 branch_start = metapath_branch_start(mp);
495 iblks += (height - branch_start);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000496 }
497 }
498
499 /* start of the second part of the function (state machine) */
500
501 blks = dblks + iblks;
502 i = sheight;
503 do {
Steven Whitehouse09010972009-05-20 10:48:47 +0100504 int error;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000505 n = blks - alloced;
Bob Peterson6e87ed02011-11-18 10:58:32 -0500506 error = gfs2_alloc_blocks(ip, &bn, &n, 0, NULL);
Steven Whitehouse09010972009-05-20 10:48:47 +0100507 if (error)
508 return error;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000509 alloced += n;
510 if (state != ALLOC_DATA || gfs2_is_jdata(ip))
511 gfs2_trans_add_unrevoke(sdp, bn, n);
512 switch (state) {
513 /* Growing height of tree */
514 case ALLOC_GROW_HEIGHT:
515 if (i == 1) {
516 ptr = (__be64 *)(dibh->b_data +
517 sizeof(struct gfs2_dinode));
518 zero_bn = *ptr;
519 }
520 for (; i - 1 < height - ip->i_height && n > 0; i++, n--)
521 gfs2_indirect_init(mp, ip->i_gl, i, 0, bn++);
522 if (i - 1 == height - ip->i_height) {
523 i--;
524 gfs2_buffer_copy_tail(mp->mp_bh[i],
525 sizeof(struct gfs2_meta_header),
526 dibh, sizeof(struct gfs2_dinode));
527 gfs2_buffer_clear_tail(dibh,
528 sizeof(struct gfs2_dinode) +
529 sizeof(__be64));
530 ptr = (__be64 *)(mp->mp_bh[i]->b_data +
531 sizeof(struct gfs2_meta_header));
532 *ptr = zero_bn;
533 state = ALLOC_GROW_DEPTH;
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500534 for(i = branch_start; i < height; i++) {
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000535 if (mp->mp_bh[i] == NULL)
536 break;
537 brelse(mp->mp_bh[i]);
538 mp->mp_bh[i] = NULL;
539 }
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500540 i = branch_start;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000541 }
542 if (n == 0)
543 break;
544 /* Branching from existing tree */
545 case ALLOC_GROW_DEPTH:
546 if (i > 1 && i < height)
547 gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[i-1], 1);
548 for (; i < height && n > 0; i++, n--)
549 gfs2_indirect_init(mp, ip->i_gl, i,
550 mp->mp_list[i-1], bn++);
551 if (i == height)
552 state = ALLOC_DATA;
553 if (n == 0)
554 break;
555 /* Tree complete, adding data blocks */
556 case ALLOC_DATA:
557 BUG_ON(n > dblks);
558 BUG_ON(mp->mp_bh[end_of_metadata] == NULL);
559 gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[end_of_metadata], 1);
560 dblks = n;
561 ptr = metapointer(end_of_metadata, mp);
562 dblock = bn;
563 while (n-- > 0)
564 *ptr++ = cpu_to_be64(bn++);
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500565 if (buffer_zeronew(bh_map)) {
566 ret = sb_issue_zeroout(sb, dblock, dblks,
567 GFP_NOFS);
568 if (ret) {
569 fs_err(sdp,
570 "Failed to zero data buffers\n");
571 clear_buffer_zeronew(bh_map);
572 }
573 }
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000574 break;
575 }
Steven Whitehouse07ccb7b2010-02-12 10:10:55 +0000576 } while ((state != ALLOC_DATA) || !dblock);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000577
578 ip->i_height = height;
579 gfs2_add_inode_blocks(&ip->i_inode, alloced);
580 gfs2_dinode_out(ip, mp->mp_bh[0]->b_data);
581 map_bh(bh_map, inode->i_sb, dblock);
582 bh_map->b_size = dblks << inode->i_blkbits;
583 set_buffer_new(bh_map);
584 return 0;
585}
586
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500587/**
588 * gfs2_block_map - Map a block from an inode to a disk block
589 * @inode: The inode
590 * @lblock: The logical block number
591 * @bh_map: The bh to be mapped
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000592 * @create: True if its ok to alloc blocks to satify the request
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500593 *
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000594 * Sets buffer_mapped() if successful, sets buffer_boundary() if a
595 * read of metadata will be required before the next block can be
596 * mapped. Sets buffer_new() if new blocks were allocated.
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500597 *
598 * Returns: errno
599 */
600
Bob Petersone9e1ef22007-12-10 14:13:27 -0600601int gfs2_block_map(struct inode *inode, sector_t lblock,
602 struct buffer_head *bh_map, int create)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400603{
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500604 struct gfs2_inode *ip = GFS2_I(inode);
605 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000606 unsigned int bsize = sdp->sd_sb.sb_bsize;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000607 const unsigned int maxlen = bh_map->b_size >> inode->i_blkbits;
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000608 const u64 *arr = sdp->sd_heightsize;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000609 __be64 *ptr;
610 u64 size;
611 struct metapath mp;
612 int ret;
613 int eob;
614 unsigned int len;
615 struct buffer_head *bh;
616 u8 height;
617
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500618 BUG_ON(maxlen == 0);
619
Steven Whitehousedbac6712008-01-29 09:12:55 +0000620 memset(mp.mp_bh, 0, sizeof(mp.mp_bh));
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000621 bmap_lock(ip, create);
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500622 clear_buffer_mapped(bh_map);
623 clear_buffer_new(bh_map);
624 clear_buffer_boundary(bh_map);
Steven Whitehouse63997772009-06-12 08:49:20 +0100625 trace_gfs2_bmap(ip, bh_map, lblock, create, 1);
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000626 if (gfs2_is_dir(ip)) {
627 bsize = sdp->sd_jbsize;
628 arr = sdp->sd_jheightsize;
629 }
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000630
631 ret = gfs2_meta_inode_buffer(ip, &mp.mp_bh[0]);
632 if (ret)
633 goto out;
634
635 height = ip->i_height;
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500636 size = (lblock + 1) * bsize;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000637 while (size > arr[height])
638 height++;
639 find_metapath(sdp, lblock, &mp, height);
640 ret = 1;
641 if (height > ip->i_height || gfs2_is_stuffed(ip))
642 goto do_alloc;
643 ret = lookup_metapath(ip, &mp);
644 if (ret < 0)
645 goto out;
646 if (ret != ip->i_height)
647 goto do_alloc;
648 ptr = metapointer(ip->i_height - 1, &mp);
649 if (*ptr == 0)
650 goto do_alloc;
651 map_bh(bh_map, inode->i_sb, be64_to_cpu(*ptr));
652 bh = mp.mp_bh[ip->i_height - 1];
653 len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen, &eob);
654 bh_map->b_size = (len << inode->i_blkbits);
655 if (eob)
656 set_buffer_boundary(bh_map);
657 ret = 0;
658out:
Steven Whitehousedbac6712008-01-29 09:12:55 +0000659 release_metapath(&mp);
Steven Whitehouse63997772009-06-12 08:49:20 +0100660 trace_gfs2_bmap(ip, bh_map, lblock, create, ret);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000661 bmap_unlock(ip, create);
662 return ret;
663
664do_alloc:
665 /* All allocations are done here, firstly check create flag */
666 if (!create) {
667 BUG_ON(gfs2_is_stuffed(ip));
668 ret = 0;
669 goto out;
670 }
671
672 /* At this point ret is the tree depth of already allocated blocks */
673 ret = gfs2_bmap_alloc(inode, lblock, bh_map, &mp, ret, height, maxlen);
674 goto out;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400675}
676
Steven Whitehouse941e6d72008-01-28 08:47:38 +0000677/*
678 * Deprecated: do not use in new code
679 */
Steven Whitehousefd88de562006-05-05 16:59:11 -0400680int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen)
681{
Steven Whitehouse23591252006-10-13 17:25:45 -0400682 struct buffer_head bh = { .b_state = 0, .b_blocknr = 0 };
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -0400683 int ret;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400684 int create = *new;
685
686 BUG_ON(!extlen);
687 BUG_ON(!dblock);
688 BUG_ON(!new);
689
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000690 bh.b_size = 1 << (inode->i_blkbits + (create ? 0 : 5));
Bob Petersone9e1ef22007-12-10 14:13:27 -0600691 ret = gfs2_block_map(inode, lblock, &bh, create);
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -0400692 *extlen = bh.b_size >> inode->i_blkbits;
693 *dblock = bh.b_blocknr;
694 if (buffer_new(&bh))
695 *new = 1;
696 else
697 *new = 0;
698 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000699}
700
701/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000702 * do_strip - Look for a layer a particular layer of the file and strip it off
703 * @ip: the inode
704 * @dibh: the dinode buffer
705 * @bh: A buffer of pointers
706 * @top: The first pointer in the buffer
707 * @bottom: One more than the last pointer
708 * @height: the height this buffer is at
709 * @data: a pointer to a struct strip_mine
710 *
711 * Returns: errno
712 */
713
714static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
Al Virob44b84d2006-10-14 10:46:30 -0400715 struct buffer_head *bh, __be64 *top, __be64 *bottom,
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100716 unsigned int height, struct strip_mine *sm)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000717{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400718 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000719 struct gfs2_rgrp_list rlist;
Steven Whitehousecd915492006-09-04 12:49:07 -0400720 u64 bn, bstart;
Bob Peterson4c16c362011-02-23 16:11:33 -0500721 u32 blen, btotal;
Al Virob44b84d2006-10-14 10:46:30 -0400722 __be64 *p;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000723 unsigned int rg_blocks = 0;
724 int metadata;
725 unsigned int revokes = 0;
726 int x;
Bob Peterson5e2f7d62012-04-04 22:11:16 -0400727 int error;
728
729 error = gfs2_rindex_update(sdp);
730 if (error)
731 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000732
733 if (!*top)
734 sm->sm_first = 0;
735
736 if (height != sm->sm_height)
737 return 0;
738
739 if (sm->sm_first) {
740 top++;
741 sm->sm_first = 0;
742 }
743
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000744 metadata = (height != ip->i_height - 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000745 if (metadata)
746 revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs;
Steven Whitehouse6d3117b2011-05-21 14:05:58 +0100747 else if (ip->i_depth)
748 revokes = sdp->sd_inptrs;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000749
David Teiglandb3b94fa2006-01-16 16:50:04 +0000750 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
751 bstart = 0;
752 blen = 0;
753
754 for (p = top; p < bottom; p++) {
755 if (!*p)
756 continue;
757
758 bn = be64_to_cpu(*p);
759
760 if (bstart + blen == bn)
761 blen++;
762 else {
763 if (bstart)
Steven Whitehouse70b0c362011-09-02 16:08:09 +0100764 gfs2_rlist_add(ip, &rlist, bstart);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000765
766 bstart = bn;
767 blen = 1;
768 }
769 }
770
771 if (bstart)
Steven Whitehouse70b0c362011-09-02 16:08:09 +0100772 gfs2_rlist_add(ip, &rlist, bstart);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000773 else
774 goto out; /* Nothing to do */
775
Bob Petersonfe6c9912008-01-28 11:13:02 -0600776 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000777
778 for (x = 0; x < rlist.rl_rgrps; x++) {
779 struct gfs2_rgrpd *rgd;
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500780 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100781 rg_blocks += rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000782 }
783
784 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
785 if (error)
786 goto out_rlist;
787
Bob Peterson8e2e0042012-07-19 08:12:40 -0400788 if (gfs2_rs_active(ip->i_res)) /* needs to be done with the rgrp glock held */
789 gfs2_rs_deltree(ip->i_res);
790
David Teiglandb3b94fa2006-01-16 16:50:04 +0000791 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE +
792 RES_INDIRECT + RES_STATFS + RES_QUOTA,
793 revokes);
794 if (error)
795 goto out_rg_gunlock;
796
797 down_write(&ip->i_rw_mutex);
798
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000799 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
800 gfs2_trans_add_bh(ip->i_gl, bh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000801
802 bstart = 0;
803 blen = 0;
Bob Peterson4c16c362011-02-23 16:11:33 -0500804 btotal = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000805
806 for (p = top; p < bottom; p++) {
807 if (!*p)
808 continue;
809
810 bn = be64_to_cpu(*p);
811
812 if (bstart + blen == bn)
813 blen++;
814 else {
815 if (bstart) {
Eric Sandeen46fcb2e2011-06-23 10:39:34 -0500816 __gfs2_free_blocks(ip, bstart, blen, metadata);
Bob Peterson4c16c362011-02-23 16:11:33 -0500817 btotal += blen;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000818 }
819
820 bstart = bn;
821 blen = 1;
822 }
823
824 *p = 0;
Steven Whitehouse77658aa2008-02-12 14:17:27 +0000825 gfs2_add_inode_blocks(&ip->i_inode, -1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000826 }
827 if (bstart) {
Eric Sandeen46fcb2e2011-06-23 10:39:34 -0500828 __gfs2_free_blocks(ip, bstart, blen, metadata);
Bob Peterson4c16c362011-02-23 16:11:33 -0500829 btotal += blen;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000830 }
831
Bob Peterson4c16c362011-02-23 16:11:33 -0500832 gfs2_statfs_change(sdp, 0, +btotal, 0);
833 gfs2_quota_change(ip, -(s64)btotal, ip->i_inode.i_uid,
834 ip->i_inode.i_gid);
835
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100836 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000837
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500838 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000839
840 up_write(&ip->i_rw_mutex);
841
842 gfs2_trans_end(sdp);
843
Steven Whitehousea91ea692006-09-04 12:04:26 -0400844out_rg_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000845 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400846out_rlist:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000847 gfs2_rlist_free(&rlist);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400848out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000849 return error;
850}
851
852/**
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100853 * recursive_scan - recursively scan through the end of a file
854 * @ip: the inode
855 * @dibh: the dinode buffer
856 * @mp: the path through the metadata to the point to start
857 * @height: the height the recursion is at
858 * @block: the indirect block to look at
859 * @first: 1 if this is the first block
860 * @sm: data opaque to this function to pass to @bc
861 *
862 * When this is first called @height and @block should be zero and
863 * @first should be 1.
864 *
865 * Returns: errno
866 */
867
868static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh,
869 struct metapath *mp, unsigned int height,
870 u64 block, int first, struct strip_mine *sm)
871{
872 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
873 struct buffer_head *bh = NULL;
Steven Whitehouseb99b98d2011-09-21 11:05:16 +0100874 __be64 *top, *bottom;
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100875 u64 bn;
876 int error;
877 int mh_size = sizeof(struct gfs2_meta_header);
878
879 if (!height) {
880 error = gfs2_meta_inode_buffer(ip, &bh);
881 if (error)
882 return error;
883 dibh = bh;
884
885 top = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0];
886 bottom = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + sdp->sd_diptrs;
887 } else {
Bob Petersonf2f9c812012-05-10 08:33:55 -0400888 error = gfs2_meta_indirect_buffer(ip, height, block, &bh);
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100889 if (error)
890 return error;
891
892 top = (__be64 *)(bh->b_data + mh_size) +
893 (first ? mp->mp_list[height] : 0);
894
895 bottom = (__be64 *)(bh->b_data + mh_size) + sdp->sd_inptrs;
896 }
897
898 error = do_strip(ip, dibh, bh, top, bottom, height, sm);
899 if (error)
900 goto out;
901
Bob Petersonbd5437a2011-09-15 09:59:56 -0400902 if (height < ip->i_height - 1) {
Bob Petersonbd5437a2011-09-15 09:59:56 -0400903
Steven Whitehouseb99b98d2011-09-21 11:05:16 +0100904 gfs2_metapath_ra(ip->i_gl, bh, top);
Bob Petersonbd5437a2011-09-15 09:59:56 -0400905
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100906 for (; top < bottom; top++, first = 0) {
907 if (!*top)
908 continue;
909
910 bn = be64_to_cpu(*top);
911
912 error = recursive_scan(ip, dibh, mp, height + 1, bn,
913 first, sm);
914 if (error)
915 break;
916 }
Bob Petersonbd5437a2011-09-15 09:59:56 -0400917 }
Steven Whitehoused56fa8a2011-09-02 12:43:41 +0100918out:
919 brelse(bh);
920 return error;
921}
922
923
924/**
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400925 * gfs2_block_truncate_page - Deal with zeroing out data for truncate
926 *
927 * This is partly borrowed from ext3.
928 */
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100929static int gfs2_block_truncate_page(struct address_space *mapping, loff_t from)
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400930{
931 struct inode *inode = mapping->host;
932 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400933 unsigned long index = from >> PAGE_CACHE_SHIFT;
934 unsigned offset = from & (PAGE_CACHE_SIZE-1);
935 unsigned blocksize, iblock, length, pos;
936 struct buffer_head *bh;
937 struct page *page;
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400938 int err;
939
Bob Peterson220cca22012-03-19 15:25:50 -0400940 page = find_or_create_page(mapping, index, GFP_NOFS);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400941 if (!page)
942 return 0;
943
944 blocksize = inode->i_sb->s_blocksize;
945 length = blocksize - (offset & (blocksize - 1));
946 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
947
948 if (!page_has_buffers(page))
949 create_empty_buffers(page, blocksize, 0);
950
951 /* Find the buffer that contains "offset" */
952 bh = page_buffers(page);
953 pos = blocksize;
954 while (offset >= pos) {
955 bh = bh->b_this_page;
956 iblock++;
957 pos += blocksize;
958 }
959
960 err = 0;
961
962 if (!buffer_mapped(bh)) {
Bob Petersone9e1ef22007-12-10 14:13:27 -0600963 gfs2_block_map(inode, iblock, bh, 0);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400964 /* unmapped? It's a hole - nothing to do */
965 if (!buffer_mapped(bh))
966 goto unlock;
967 }
968
969 /* Ok, it's mapped. Make sure it's up-to-date */
970 if (PageUptodate(page))
971 set_buffer_uptodate(bh);
972
973 if (!buffer_uptodate(bh)) {
974 err = -EIO;
975 ll_rw_block(READ, 1, &bh);
976 wait_on_buffer(bh);
977 /* Uhhuh. Read error. Complain and punt. */
978 if (!buffer_uptodate(bh))
979 goto unlock;
S. Wendy Cheng1875f2f2007-06-25 21:14:31 -0400980 err = 0;
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400981 }
982
Steven Whitehousebf36a712007-10-17 08:35:19 +0100983 if (!gfs2_is_writeback(ip))
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400984 gfs2_trans_add_bh(ip->i_gl, bh, 0);
985
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800986 zero_user(page, offset, length);
Steven Whitehouse40bc9a22009-06-10 09:09:40 +0100987 mark_buffer_dirty(bh);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400988unlock:
989 unlock_page(page);
990 page_cache_release(page);
991 return err;
992}
993
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100994static int trunc_start(struct inode *inode, u64 oldsize, u64 newsize)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000995{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100996 struct gfs2_inode *ip = GFS2_I(inode);
997 struct gfs2_sbd *sdp = GFS2_SB(inode);
998 struct address_space *mapping = inode->i_mapping;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000999 struct buffer_head *dibh;
1000 int journaled = gfs2_is_jdata(ip);
1001 int error;
1002
1003 error = gfs2_trans_begin(sdp,
Jan Engelhardtc53921242006-09-05 14:30:40 +02001004 RES_DINODE + (journaled ? RES_JDATA : 0), 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001005 if (error)
1006 return error;
1007
1008 error = gfs2_meta_inode_buffer(ip, &dibh);
1009 if (error)
1010 goto out;
1011
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001012 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001013
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001014 if (gfs2_is_stuffed(ip)) {
1015 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + newsize);
1016 } else {
1017 if (newsize & (u64)(sdp->sd_sb.sb_bsize - 1)) {
1018 error = gfs2_block_truncate_page(mapping, newsize);
1019 if (error)
1020 goto out_brelse;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001021 }
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001022 ip->i_diskflags |= GFS2_DIF_TRUNC_IN_PROG;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001023 }
1024
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001025 i_size_write(inode, newsize);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001026 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
1027 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001028
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001029 truncate_pagecache(inode, oldsize, newsize);
1030out_brelse:
1031 brelse(dibh);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001032out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001033 gfs2_trans_end(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001034 return error;
1035}
1036
Steven Whitehousecd915492006-09-04 12:49:07 -04001037static int trunc_dealloc(struct gfs2_inode *ip, u64 size)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001038{
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +00001039 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouseecc30c72008-01-28 10:37:35 +00001040 unsigned int height = ip->i_height;
Steven Whitehousecd915492006-09-04 12:49:07 -04001041 u64 lblock;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001042 struct metapath mp;
1043 int error;
1044
1045 if (!size)
1046 lblock = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +00001047 else
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +00001048 lblock = (size - 1) >> sdp->sd_sb.sb_bsize_shift;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001049
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +00001050 find_metapath(sdp, lblock, &mp, ip->i_height);
Bob Peterson5407e242012-05-18 09:28:23 -04001051 error = gfs2_rindex_update(sdp);
1052 if (error)
1053 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001054
1055 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1056 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -04001057 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001058
1059 while (height--) {
1060 struct strip_mine sm;
1061 sm.sm_first = !!size;
1062 sm.sm_height = height;
1063
Steven Whitehoused56fa8a2011-09-02 12:43:41 +01001064 error = recursive_scan(ip, NULL, &mp, 0, 0, 1, &sm);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001065 if (error)
1066 break;
1067 }
1068
1069 gfs2_quota_unhold(ip);
1070
David Teiglandb3b94fa2006-01-16 16:50:04 +00001071 return error;
1072}
1073
1074static int trunc_end(struct gfs2_inode *ip)
1075{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001076 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001077 struct buffer_head *dibh;
1078 int error;
1079
1080 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1081 if (error)
1082 return error;
1083
1084 down_write(&ip->i_rw_mutex);
1085
1086 error = gfs2_meta_inode_buffer(ip, &dibh);
1087 if (error)
1088 goto out;
1089
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001090 if (!i_size_read(&ip->i_inode)) {
Steven Whitehouseecc30c72008-01-28 10:37:35 +00001091 ip->i_height = 0;
Steven Whitehousece276b02008-02-06 09:25:45 +00001092 ip->i_goal = ip->i_no_addr;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001093 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
1094 }
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001095 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001096 ip->i_diskflags &= ~GFS2_DIF_TRUNC_IN_PROG;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001097
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001098 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001099 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001100 brelse(dibh);
1101
Steven Whitehousea91ea692006-09-04 12:04:26 -04001102out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001103 up_write(&ip->i_rw_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001104 gfs2_trans_end(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001105 return error;
1106}
1107
1108/**
1109 * do_shrink - make a file smaller
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001110 * @inode: the inode
1111 * @oldsize: the current inode size
1112 * @newsize: the size to make the file
David Teiglandb3b94fa2006-01-16 16:50:04 +00001113 *
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001114 * Called with an exclusive lock on @inode. The @size must
1115 * be equal to or smaller than the current inode size.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001116 *
1117 * Returns: errno
1118 */
1119
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001120static int do_shrink(struct inode *inode, u64 oldsize, u64 newsize)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001121{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001122 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001123 int error;
1124
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001125 error = trunc_start(inode, oldsize, newsize);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001126 if (error < 0)
1127 return error;
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001128 if (gfs2_is_stuffed(ip))
David Teiglandb3b94fa2006-01-16 16:50:04 +00001129 return 0;
1130
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001131 error = trunc_dealloc(ip, newsize);
1132 if (error == 0)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001133 error = trunc_end(ip);
1134
1135 return error;
1136}
1137
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001138void gfs2_trim_blocks(struct inode *inode)
Wendy Chenga13b8c52007-08-20 09:29:53 -04001139{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001140 u64 size = inode->i_size;
1141 int ret;
1142
1143 ret = do_shrink(inode, size, size);
1144 WARN_ON(ret != 0);
1145}
1146
1147/**
1148 * do_grow - Touch and update inode size
1149 * @inode: The inode
1150 * @size: The new size
1151 *
1152 * This function updates the timestamps on the inode and
1153 * may also increase the size of the inode. This function
1154 * must not be called with @size any smaller than the current
1155 * inode size.
1156 *
1157 * Although it is not strictly required to unstuff files here,
1158 * earlier versions of GFS2 have a bug in the stuffed file reading
1159 * code which will result in a buffer overrun if the size is larger
1160 * than the max stuffed file size. In order to prevent this from
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001161 * occurring, such files are unstuffed, but in other cases we can
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001162 * just update the inode size directly.
1163 *
1164 * Returns: 0 on success, or -ve on error
1165 */
1166
1167static int do_grow(struct inode *inode, u64 size)
1168{
1169 struct gfs2_inode *ip = GFS2_I(inode);
1170 struct gfs2_sbd *sdp = GFS2_SB(inode);
Wendy Chenga13b8c52007-08-20 09:29:53 -04001171 struct buffer_head *dibh;
1172 int error;
Bob Peterson2f7ee352012-04-12 09:19:30 -04001173 int unstuff = 0;
Wendy Chenga13b8c52007-08-20 09:29:53 -04001174
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001175 if (gfs2_is_stuffed(ip) &&
1176 (size > (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)))) {
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001177 error = gfs2_quota_lock_check(ip);
1178 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -04001179 return error;
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001180
Bob Peterson564e12b2011-11-21 13:36:17 -05001181 error = gfs2_inplace_reserve(ip, 1);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001182 if (error)
1183 goto do_grow_qunlock;
Bob Peterson2f7ee352012-04-12 09:19:30 -04001184 unstuff = 1;
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001185 }
1186
Benjamin Marzinskibf97b672010-09-27 16:00:04 -05001187 error = gfs2_trans_begin(sdp, RES_DINODE + RES_STATFS + RES_RG_BIT, 0);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001188 if (error)
1189 goto do_grow_release;
1190
Bob Peterson2f7ee352012-04-12 09:19:30 -04001191 if (unstuff) {
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001192 error = gfs2_unstuff_dinode(ip, NULL);
1193 if (error)
1194 goto do_end_trans;
1195 }
Wendy Chenga13b8c52007-08-20 09:29:53 -04001196
1197 error = gfs2_meta_inode_buffer(ip, &dibh);
1198 if (error)
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001199 goto do_end_trans;
Wendy Chenga13b8c52007-08-20 09:29:53 -04001200
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001201 i_size_write(inode, size);
Wendy Chenga13b8c52007-08-20 09:29:53 -04001202 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
1203 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1204 gfs2_dinode_out(ip, dibh->b_data);
1205 brelse(dibh);
1206
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001207do_end_trans:
Wendy Chenga13b8c52007-08-20 09:29:53 -04001208 gfs2_trans_end(sdp);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001209do_grow_release:
Bob Peterson2f7ee352012-04-12 09:19:30 -04001210 if (unstuff) {
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001211 gfs2_inplace_release(ip);
1212do_grow_qunlock:
1213 gfs2_quota_unlock(ip);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001214 }
Wendy Chenga13b8c52007-08-20 09:29:53 -04001215 return error;
1216}
1217
David Teiglandb3b94fa2006-01-16 16:50:04 +00001218/**
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001219 * gfs2_setattr_size - make a file a given size
1220 * @inode: the inode
1221 * @newsize: the size to make the file
David Teiglandb3b94fa2006-01-16 16:50:04 +00001222 *
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001223 * The file size can grow, shrink, or stay the same size. This
1224 * is called holding i_mutex and an exclusive glock on the inode
1225 * in question.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001226 *
1227 * Returns: errno
1228 */
1229
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001230int gfs2_setattr_size(struct inode *inode, u64 newsize)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001231{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001232 int ret;
1233 u64 oldsize;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001234
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001235 BUG_ON(!S_ISREG(inode->i_mode));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001236
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001237 ret = inode_newsize_ok(inode, newsize);
1238 if (ret)
1239 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001240
Christoph Hellwig562c72a2011-06-24 14:29:45 -04001241 inode_dio_wait(inode);
1242
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001243 oldsize = inode->i_size;
1244 if (newsize >= oldsize)
1245 return do_grow(inode, newsize);
1246
1247 return do_shrink(inode, oldsize, newsize);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001248}
1249
1250int gfs2_truncatei_resume(struct gfs2_inode *ip)
1251{
1252 int error;
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001253 error = trunc_dealloc(ip, i_size_read(&ip->i_inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001254 if (!error)
1255 error = trunc_end(ip);
1256 return error;
1257}
1258
1259int gfs2_file_dealloc(struct gfs2_inode *ip)
1260{
1261 return trunc_dealloc(ip, 0);
1262}
1263
1264/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001265 * gfs2_write_alloc_required - figure out if a write will require an allocation
1266 * @ip: the file being written to
1267 * @offset: the offset to write to
1268 * @len: the number of bytes being written
David Teiglandb3b94fa2006-01-16 16:50:04 +00001269 *
Bob Peterson461cb412010-06-24 19:21:20 -04001270 * Returns: 1 if an alloc is required, 0 otherwise
David Teiglandb3b94fa2006-01-16 16:50:04 +00001271 */
1272
Steven Whitehousecd915492006-09-04 12:49:07 -04001273int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
Bob Peterson461cb412010-06-24 19:21:20 -04001274 unsigned int len)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001275{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001276 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001277 struct buffer_head bh;
1278 unsigned int shift;
1279 u64 lblock, lblock_stop, size;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +00001280 u64 end_of_file;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001281
David Teiglandb3b94fa2006-01-16 16:50:04 +00001282 if (!len)
1283 return 0;
1284
1285 if (gfs2_is_stuffed(ip)) {
1286 if (offset + len >
1287 sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode))
Bob Peterson461cb412010-06-24 19:21:20 -04001288 return 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001289 return 0;
1290 }
1291
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001292 shift = sdp->sd_sb.sb_bsize_shift;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +00001293 BUG_ON(gfs2_is_dir(ip));
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001294 end_of_file = (i_size_read(&ip->i_inode) + sdp->sd_sb.sb_bsize - 1) >> shift;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +00001295 lblock = offset >> shift;
1296 lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift;
1297 if (lblock_stop > end_of_file)
Bob Peterson461cb412010-06-24 19:21:20 -04001298 return 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001299
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001300 size = (lblock_stop - lblock) << shift;
1301 do {
1302 bh.b_state = 0;
1303 bh.b_size = size;
1304 gfs2_block_map(&ip->i_inode, lblock, &bh, 0);
1305 if (!buffer_mapped(&bh))
Bob Peterson461cb412010-06-24 19:21:20 -04001306 return 1;
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001307 size -= bh.b_size;
1308 lblock += (bh.b_size >> ip->i_inode.i_blkbits);
1309 } while(size > 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001310
1311 return 0;
1312}
1313