blob: 5476c066d4ee336733445eda2f804561179ecb41 [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>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050013#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050014#include <linux/crc32.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000015
16#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050017#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000018#include "bmap.h"
19#include "glock.h"
20#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000021#include "meta_io.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000022#include "quota.h"
23#include "rgrp.h"
24#include "trans.h"
Steven Whitehouse18ec7d52006-02-08 11:50:51 +000025#include "dir.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050026#include "util.h"
Steven Whitehouse63997772009-06-12 08:49:20 +010027#include "trace_gfs2.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000028
29/* This doesn't need to be that large as max 64 bit pointers in a 4k
30 * block is 512, so __u16 is fine for that. It saves stack space to
31 * keep it small.
32 */
33struct metapath {
Steven Whitehousedbac6712008-01-29 09:12:55 +000034 struct buffer_head *mp_bh[GFS2_MAX_META_HEIGHT];
David Teiglandb3b94fa2006-01-16 16:50:04 +000035 __u16 mp_list[GFS2_MAX_META_HEIGHT];
36};
37
38typedef int (*block_call_t) (struct gfs2_inode *ip, struct buffer_head *dibh,
Al Virob44b84d2006-10-14 10:46:30 -040039 struct buffer_head *bh, __be64 *top,
40 __be64 *bottom, unsigned int height,
David Teiglandb3b94fa2006-01-16 16:50:04 +000041 void *data);
42
43struct strip_mine {
44 int sm_first;
45 unsigned int sm_height;
46};
47
48/**
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040049 * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
50 * @ip: the inode
51 * @dibh: the dinode buffer
52 * @block: the block number that was allocated
Steven Whitehouseff8f33c2010-08-11 09:37:53 +010053 * @page: The (optional) page. This is looked up if @page is NULL
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040054 *
55 * Returns: errno
56 */
57
58static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
Steven Whitehousecd915492006-09-04 12:49:07 -040059 u64 block, struct page *page)
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040060{
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040061 struct inode *inode = &ip->i_inode;
62 struct buffer_head *bh;
63 int release = 0;
64
65 if (!page || page->index) {
66 page = grab_cache_page(inode->i_mapping, 0);
67 if (!page)
68 return -ENOMEM;
69 release = 1;
70 }
71
72 if (!PageUptodate(page)) {
73 void *kaddr = kmap(page);
Steven Whitehouse602c89d2010-03-25 14:32:43 +000074 u64 dsize = i_size_read(inode);
75
76 if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode)))
77 dsize = dibh->b_size - sizeof(struct gfs2_dinode);
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040078
Steven Whitehouse602c89d2010-03-25 14:32:43 +000079 memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
80 memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize);
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040081 kunmap(page);
82
83 SetPageUptodate(page);
84 }
85
86 if (!page_has_buffers(page))
87 create_empty_buffers(page, 1 << inode->i_blkbits,
88 (1 << BH_Uptodate));
89
90 bh = page_buffers(page);
91
92 if (!buffer_mapped(bh))
93 map_bh(bh, inode->i_sb, block);
94
95 set_buffer_uptodate(bh);
Steven Whitehouseeaf96522007-08-27 09:49:37 +010096 if (!gfs2_is_jdata(ip))
97 mark_buffer_dirty(bh);
Steven Whitehousebf36a712007-10-17 08:35:19 +010098 if (!gfs2_is_writeback(ip))
Bob Peterson84754872007-09-02 10:55:29 +010099 gfs2_trans_add_bh(ip->i_gl, bh, 0);
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400100
101 if (release) {
102 unlock_page(page);
103 page_cache_release(page);
104 }
105
106 return 0;
107}
108
109/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000110 * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
111 * @ip: The GFS2 inode to unstuff
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100112 * @page: The (optional) page. This is looked up if the @page is NULL
David Teiglandb3b94fa2006-01-16 16:50:04 +0000113 *
114 * This routine unstuffs a dinode and returns it to a "normal" state such
115 * that the height can be grown in the traditional way.
116 *
117 * Returns: errno
118 */
119
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400120int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000121{
122 struct buffer_head *bh, *dibh;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400123 struct gfs2_dinode *di;
Steven Whitehousecd915492006-09-04 12:49:07 -0400124 u64 block = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000125 int isdir = gfs2_is_dir(ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000126 int error;
127
128 down_write(&ip->i_rw_mutex);
129
130 error = gfs2_meta_inode_buffer(ip, &dibh);
131 if (error)
132 goto out;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400133
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100134 if (i_size_read(&ip->i_inode)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000135 /* Get a free block, fill it with the stuffed data,
136 and write it out to disk */
137
Steven Whitehouseb45e41d2008-02-06 10:11:15 +0000138 unsigned int n = 1;
Steven Whitehouse09010972009-05-20 10:48:47 +0100139 error = gfs2_alloc_block(ip, &block, &n);
140 if (error)
141 goto out_brelse;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000142 if (isdir) {
Steven Whitehouse5731be52008-02-01 13:16:55 +0000143 gfs2_trans_add_unrevoke(GFS2_SB(&ip->i_inode), block, 1);
Steven Whitehouse61e085a2006-04-24 10:07:13 -0400144 error = gfs2_dir_get_new_buffer(ip, block, &bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000145 if (error)
146 goto out_brelse;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400147 gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_meta_header),
David Teiglandb3b94fa2006-01-16 16:50:04 +0000148 dibh, sizeof(struct gfs2_dinode));
149 brelse(bh);
150 } else {
Steven Whitehousef25ef0c2006-07-26 10:51:20 -0400151 error = gfs2_unstuffer_page(ip, dibh, block, page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000152 if (error)
153 goto out_brelse;
154 }
155 }
156
157 /* Set up the pointer to the new block */
158
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000159 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400160 di = (struct gfs2_dinode *)dibh->b_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000161 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
162
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100163 if (i_size_read(&ip->i_inode)) {
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400164 *(__be64 *)(di + 1) = cpu_to_be64(block);
Steven Whitehouse77658aa2008-02-12 14:17:27 +0000165 gfs2_add_inode_blocks(&ip->i_inode, 1);
166 di->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000167 }
168
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000169 ip->i_height = 1;
Steven Whitehouse48516ce2006-10-02 12:39:19 -0400170 di->di_height = cpu_to_be16(1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000171
Steven Whitehousea91ea692006-09-04 12:04:26 -0400172out_brelse:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000173 brelse(dibh);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400174out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000175 up_write(&ip->i_rw_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000176 return error;
177}
178
David Teiglandb3b94fa2006-01-16 16:50:04 +0000179
180/**
181 * find_metapath - Find path through the metadata tree
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000182 * @sdp: The superblock
David Teiglandb3b94fa2006-01-16 16:50:04 +0000183 * @mp: The metapath to return the result in
184 * @block: The disk block to look up
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000185 * @height: The pre-calculated height of the metadata tree
David Teiglandb3b94fa2006-01-16 16:50:04 +0000186 *
187 * This routine returns a struct metapath structure that defines a path
188 * through the metadata of inode "ip" to get to block "block".
189 *
190 * Example:
191 * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a
192 * filesystem with a blocksize of 4096.
193 *
194 * find_metapath() would return a struct metapath structure set to:
195 * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48,
196 * and mp_list[2] = 165.
197 *
198 * That means that in order to get to the block containing the byte at
199 * offset 101342453, we would load the indirect block pointed to by pointer
200 * 0 in the dinode. We would then load the indirect block pointed to by
201 * pointer 48 in that indirect block. We would then load the data block
202 * pointed to by pointer 165 in that indirect block.
203 *
204 * ----------------------------------------
205 * | Dinode | |
206 * | | 4|
207 * | |0 1 2 3 4 5 9|
208 * | | 6|
209 * ----------------------------------------
210 * |
211 * |
212 * V
213 * ----------------------------------------
214 * | Indirect Block |
215 * | 5|
216 * | 4 4 4 4 4 5 5 1|
217 * |0 5 6 7 8 9 0 1 2|
218 * ----------------------------------------
219 * |
220 * |
221 * V
222 * ----------------------------------------
223 * | Indirect Block |
224 * | 1 1 1 1 1 5|
225 * | 6 6 6 6 6 1|
226 * |0 3 4 5 6 7 2|
227 * ----------------------------------------
228 * |
229 * |
230 * V
231 * ----------------------------------------
232 * | Data block containing offset |
233 * | 101342453 |
234 * | |
235 * | |
236 * ----------------------------------------
237 *
238 */
239
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000240static void find_metapath(const struct gfs2_sbd *sdp, u64 block,
241 struct metapath *mp, unsigned int height)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000242{
David Teiglandb3b94fa2006-01-16 16:50:04 +0000243 unsigned int i;
244
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000245 for (i = height; i--;)
Bob Peterson7eabb772008-01-28 11:24:35 -0600246 mp->mp_list[i] = do_div(block, sdp->sd_inptrs);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000247
248}
249
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500250static inline unsigned int metapath_branch_start(const struct metapath *mp)
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000251{
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500252 if (mp->mp_list[0] == 0)
253 return 2;
254 return 1;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000255}
256
David Teiglandb3b94fa2006-01-16 16:50:04 +0000257/**
258 * metapointer - Return pointer to start of metadata in a buffer
David Teiglandb3b94fa2006-01-16 16:50:04 +0000259 * @height: The metadata height (0 = dinode)
260 * @mp: The metapath
261 *
262 * Return a pointer to the block number of the next height of the metadata
263 * tree given a buffer containing the pointer to the current height of the
264 * metadata tree.
265 */
266
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000267static inline __be64 *metapointer(unsigned int height, const struct metapath *mp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000268{
Steven Whitehousedbac6712008-01-29 09:12:55 +0000269 struct buffer_head *bh = mp->mp_bh[height];
David Teiglandb3b94fa2006-01-16 16:50:04 +0000270 unsigned int head_size = (height > 0) ?
271 sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000272 return ((__be64 *)(bh->b_data + head_size)) + mp->mp_list[height];
David Teiglandb3b94fa2006-01-16 16:50:04 +0000273}
274
275/**
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000276 * lookup_metapath - Walk the metadata tree to a specific point
277 * @ip: The inode
David Teiglandb3b94fa2006-01-16 16:50:04 +0000278 * @mp: The metapath
David Teiglandb3b94fa2006-01-16 16:50:04 +0000279 *
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000280 * Assumes that the inode's buffer has already been looked up and
281 * hooked onto mp->mp_bh[0] and that the metapath has been initialised
282 * by find_metapath().
David Teiglandb3b94fa2006-01-16 16:50:04 +0000283 *
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000284 * If this function encounters part of the tree which has not been
285 * allocated, it returns the current height of the tree at the point
286 * at which it found the unallocated block. Blocks which are found are
287 * added to the mp->mp_bh[] list.
288 *
289 * Returns: error or height of metadata tree
David Teiglandb3b94fa2006-01-16 16:50:04 +0000290 */
291
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000292static int lookup_metapath(struct gfs2_inode *ip, struct metapath *mp)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000293{
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000294 unsigned int end_of_metadata = ip->i_height - 1;
295 unsigned int x;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000296 __be64 *ptr;
297 u64 dblock;
Steven Whitehousee23159d2008-02-12 14:48:39 +0000298 int ret;
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000299
300 for (x = 0; x < end_of_metadata; x++) {
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000301 ptr = metapointer(x, mp);
302 dblock = be64_to_cpu(*ptr);
303 if (!dblock)
304 return x + 1;
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000305
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000306 ret = gfs2_meta_indirect_buffer(ip, x+1, dblock, 0, &mp->mp_bh[x+1]);
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000307 if (ret)
308 return ret;
309 }
310
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000311 return ip->i_height;
Steven Whitehousedbac6712008-01-29 09:12:55 +0000312}
313
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000314static inline void release_metapath(struct metapath *mp)
Steven Whitehousedbac6712008-01-29 09:12:55 +0000315{
316 int i;
317
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000318 for (i = 0; i < GFS2_MAX_META_HEIGHT; i++) {
319 if (mp->mp_bh[i] == NULL)
320 break;
321 brelse(mp->mp_bh[i]);
322 }
Steven Whitehouse11707ea2008-01-28 15:10:29 +0000323}
324
Steven Whitehouse30cbf182008-02-08 13:18:11 +0000325/**
326 * gfs2_extent_length - Returns length of an extent of blocks
327 * @start: Start of the buffer
328 * @len: Length of the buffer in bytes
329 * @ptr: Current position in the buffer
330 * @limit: Max extent length to return (0 = unlimited)
331 * @eob: Set to 1 if we hit "end of block"
332 *
333 * If the first block is zero (unallocated) it will return the number of
334 * unallocated blocks in the extent, otherwise it will return the number
335 * of contiguous blocks in the extent.
336 *
337 * Returns: The length of the extent (minimum of one block)
338 */
339
340static inline unsigned int gfs2_extent_length(void *start, unsigned int len, __be64 *ptr, unsigned limit, int *eob)
341{
342 const __be64 *end = (start + len);
343 const __be64 *first = ptr;
344 u64 d = be64_to_cpu(*ptr);
345
346 *eob = 0;
347 do {
348 ptr++;
349 if (ptr >= end)
350 break;
351 if (limit && --limit == 0)
352 break;
353 if (d)
354 d++;
355 } while(be64_to_cpu(*ptr) == d);
356 if (ptr >= end)
357 *eob = 1;
358 return (ptr - first);
359}
360
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000361static inline void bmap_lock(struct gfs2_inode *ip, int create)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400362{
Steven Whitehousefd88de562006-05-05 16:59:11 -0400363 if (create)
364 down_write(&ip->i_rw_mutex);
365 else
366 down_read(&ip->i_rw_mutex);
367}
368
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000369static inline void bmap_unlock(struct gfs2_inode *ip, int create)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400370{
David Teiglandb3b94fa2006-01-16 16:50:04 +0000371 if (create)
372 up_write(&ip->i_rw_mutex);
373 else
374 up_read(&ip->i_rw_mutex);
Steven Whitehousefd88de562006-05-05 16:59:11 -0400375}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000376
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000377static inline __be64 *gfs2_indirect_init(struct metapath *mp,
378 struct gfs2_glock *gl, unsigned int i,
379 unsigned offset, u64 bn)
380{
381 __be64 *ptr = (__be64 *)(mp->mp_bh[i - 1]->b_data +
382 ((i > 1) ? sizeof(struct gfs2_meta_header) :
383 sizeof(struct gfs2_dinode)));
384 BUG_ON(i < 1);
385 BUG_ON(mp->mp_bh[i] != NULL);
386 mp->mp_bh[i] = gfs2_meta_new(gl, bn);
387 gfs2_trans_add_bh(gl, mp->mp_bh[i], 1);
388 gfs2_metatype_set(mp->mp_bh[i], GFS2_METATYPE_IN, GFS2_FORMAT_IN);
389 gfs2_buffer_clear_tail(mp->mp_bh[i], sizeof(struct gfs2_meta_header));
390 ptr += offset;
391 *ptr = cpu_to_be64(bn);
392 return ptr;
393}
394
395enum alloc_state {
396 ALLOC_DATA = 0,
397 ALLOC_GROW_DEPTH = 1,
398 ALLOC_GROW_HEIGHT = 2,
399 /* ALLOC_UNSTUFF = 3, TBD and rather complicated */
400};
401
402/**
403 * gfs2_bmap_alloc - Build a metadata tree of the requested height
404 * @inode: The GFS2 inode
405 * @lblock: The logical starting block of the extent
406 * @bh_map: This is used to return the mapping details
407 * @mp: The metapath
408 * @sheight: The starting height (i.e. whats already mapped)
409 * @height: The height to build to
410 * @maxlen: The max number of data blocks to alloc
411 *
412 * In this routine we may have to alloc:
413 * i) Indirect blocks to grow the metadata tree height
414 * ii) Indirect blocks to fill in lower part of the metadata tree
415 * iii) Data blocks
416 *
417 * The function is in two parts. The first part works out the total
418 * number of blocks which we need. The second part does the actual
419 * allocation asking for an extent at a time (if enough contiguous free
420 * blocks are available, there will only be one request per bmap call)
421 * and uses the state machine to initialise the blocks in order.
422 *
423 * Returns: errno on error
424 */
425
426static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
427 struct buffer_head *bh_map, struct metapath *mp,
428 const unsigned int sheight,
429 const unsigned int height,
430 const unsigned int maxlen)
431{
432 struct gfs2_inode *ip = GFS2_I(inode);
433 struct gfs2_sbd *sdp = GFS2_SB(inode);
434 struct buffer_head *dibh = mp->mp_bh[0];
435 u64 bn, dblock = 0;
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500436 unsigned n, i, blks, alloced = 0, iblks = 0, branch_start = 0;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000437 unsigned dblks = 0;
438 unsigned ptrs_per_blk;
439 const unsigned end_of_metadata = height - 1;
440 int eob = 0;
441 enum alloc_state state;
442 __be64 *ptr;
443 __be64 zero_bn = 0;
444
445 BUG_ON(sheight < 1);
446 BUG_ON(dibh == NULL);
447
448 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
449
450 if (height == sheight) {
451 struct buffer_head *bh;
452 /* Bottom indirect block exists, find unalloced extent size */
453 ptr = metapointer(end_of_metadata, mp);
454 bh = mp->mp_bh[end_of_metadata];
455 dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen,
456 &eob);
457 BUG_ON(dblks < 1);
458 state = ALLOC_DATA;
459 } else {
460 /* Need to allocate indirect blocks */
461 ptrs_per_blk = height > 1 ? sdp->sd_inptrs : sdp->sd_diptrs;
462 dblks = min(maxlen, ptrs_per_blk - mp->mp_list[end_of_metadata]);
463 if (height == ip->i_height) {
464 /* Writing into existing tree, extend tree down */
465 iblks = height - sheight;
466 state = ALLOC_GROW_DEPTH;
467 } else {
468 /* Building up tree height */
469 state = ALLOC_GROW_HEIGHT;
470 iblks = height - ip->i_height;
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500471 branch_start = metapath_branch_start(mp);
472 iblks += (height - branch_start);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000473 }
474 }
475
476 /* start of the second part of the function (state machine) */
477
478 blks = dblks + iblks;
479 i = sheight;
480 do {
Steven Whitehouse09010972009-05-20 10:48:47 +0100481 int error;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000482 n = blks - alloced;
Steven Whitehouse09010972009-05-20 10:48:47 +0100483 error = gfs2_alloc_block(ip, &bn, &n);
484 if (error)
485 return error;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000486 alloced += n;
487 if (state != ALLOC_DATA || gfs2_is_jdata(ip))
488 gfs2_trans_add_unrevoke(sdp, bn, n);
489 switch (state) {
490 /* Growing height of tree */
491 case ALLOC_GROW_HEIGHT:
492 if (i == 1) {
493 ptr = (__be64 *)(dibh->b_data +
494 sizeof(struct gfs2_dinode));
495 zero_bn = *ptr;
496 }
497 for (; i - 1 < height - ip->i_height && n > 0; i++, n--)
498 gfs2_indirect_init(mp, ip->i_gl, i, 0, bn++);
499 if (i - 1 == height - ip->i_height) {
500 i--;
501 gfs2_buffer_copy_tail(mp->mp_bh[i],
502 sizeof(struct gfs2_meta_header),
503 dibh, sizeof(struct gfs2_dinode));
504 gfs2_buffer_clear_tail(dibh,
505 sizeof(struct gfs2_dinode) +
506 sizeof(__be64));
507 ptr = (__be64 *)(mp->mp_bh[i]->b_data +
508 sizeof(struct gfs2_meta_header));
509 *ptr = zero_bn;
510 state = ALLOC_GROW_DEPTH;
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500511 for(i = branch_start; i < height; i++) {
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000512 if (mp->mp_bh[i] == NULL)
513 break;
514 brelse(mp->mp_bh[i]);
515 mp->mp_bh[i] = NULL;
516 }
Benjamin Marzinski5af4e7a2008-06-24 12:53:38 -0500517 i = branch_start;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000518 }
519 if (n == 0)
520 break;
521 /* Branching from existing tree */
522 case ALLOC_GROW_DEPTH:
523 if (i > 1 && i < height)
524 gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[i-1], 1);
525 for (; i < height && n > 0; i++, n--)
526 gfs2_indirect_init(mp, ip->i_gl, i,
527 mp->mp_list[i-1], bn++);
528 if (i == height)
529 state = ALLOC_DATA;
530 if (n == 0)
531 break;
532 /* Tree complete, adding data blocks */
533 case ALLOC_DATA:
534 BUG_ON(n > dblks);
535 BUG_ON(mp->mp_bh[end_of_metadata] == NULL);
536 gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[end_of_metadata], 1);
537 dblks = n;
538 ptr = metapointer(end_of_metadata, mp);
539 dblock = bn;
540 while (n-- > 0)
541 *ptr++ = cpu_to_be64(bn++);
542 break;
543 }
Steven Whitehouse07ccb7b2010-02-12 10:10:55 +0000544 } while ((state != ALLOC_DATA) || !dblock);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000545
546 ip->i_height = height;
547 gfs2_add_inode_blocks(&ip->i_inode, alloced);
548 gfs2_dinode_out(ip, mp->mp_bh[0]->b_data);
549 map_bh(bh_map, inode->i_sb, dblock);
550 bh_map->b_size = dblks << inode->i_blkbits;
551 set_buffer_new(bh_map);
552 return 0;
553}
554
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500555/**
556 * gfs2_block_map - Map a block from an inode to a disk block
557 * @inode: The inode
558 * @lblock: The logical block number
559 * @bh_map: The bh to be mapped
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000560 * @create: True if its ok to alloc blocks to satify the request
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500561 *
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000562 * Sets buffer_mapped() if successful, sets buffer_boundary() if a
563 * read of metadata will be required before the next block can be
564 * mapped. Sets buffer_new() if new blocks were allocated.
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500565 *
566 * Returns: errno
567 */
568
Bob Petersone9e1ef22007-12-10 14:13:27 -0600569int gfs2_block_map(struct inode *inode, sector_t lblock,
570 struct buffer_head *bh_map, int create)
Steven Whitehousefd88de562006-05-05 16:59:11 -0400571{
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500572 struct gfs2_inode *ip = GFS2_I(inode);
573 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000574 unsigned int bsize = sdp->sd_sb.sb_bsize;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000575 const unsigned int maxlen = bh_map->b_size >> inode->i_blkbits;
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000576 const u64 *arr = sdp->sd_heightsize;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000577 __be64 *ptr;
578 u64 size;
579 struct metapath mp;
580 int ret;
581 int eob;
582 unsigned int len;
583 struct buffer_head *bh;
584 u8 height;
585
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500586 BUG_ON(maxlen == 0);
587
Steven Whitehousedbac6712008-01-29 09:12:55 +0000588 memset(mp.mp_bh, 0, sizeof(mp.mp_bh));
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000589 bmap_lock(ip, create);
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500590 clear_buffer_mapped(bh_map);
591 clear_buffer_new(bh_map);
592 clear_buffer_boundary(bh_map);
Steven Whitehouse63997772009-06-12 08:49:20 +0100593 trace_gfs2_bmap(ip, bh_map, lblock, create, 1);
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000594 if (gfs2_is_dir(ip)) {
595 bsize = sdp->sd_jbsize;
596 arr = sdp->sd_jheightsize;
597 }
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000598
599 ret = gfs2_meta_inode_buffer(ip, &mp.mp_bh[0]);
600 if (ret)
601 goto out;
602
603 height = ip->i_height;
Steven Whitehouse4cf1ed82006-11-15 15:21:06 -0500604 size = (lblock + 1) * bsize;
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000605 while (size > arr[height])
606 height++;
607 find_metapath(sdp, lblock, &mp, height);
608 ret = 1;
609 if (height > ip->i_height || gfs2_is_stuffed(ip))
610 goto do_alloc;
611 ret = lookup_metapath(ip, &mp);
612 if (ret < 0)
613 goto out;
614 if (ret != ip->i_height)
615 goto do_alloc;
616 ptr = metapointer(ip->i_height - 1, &mp);
617 if (*ptr == 0)
618 goto do_alloc;
619 map_bh(bh_map, inode->i_sb, be64_to_cpu(*ptr));
620 bh = mp.mp_bh[ip->i_height - 1];
621 len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen, &eob);
622 bh_map->b_size = (len << inode->i_blkbits);
623 if (eob)
624 set_buffer_boundary(bh_map);
625 ret = 0;
626out:
Steven Whitehousedbac6712008-01-29 09:12:55 +0000627 release_metapath(&mp);
Steven Whitehouse63997772009-06-12 08:49:20 +0100628 trace_gfs2_bmap(ip, bh_map, lblock, create, ret);
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000629 bmap_unlock(ip, create);
630 return ret;
631
632do_alloc:
633 /* All allocations are done here, firstly check create flag */
634 if (!create) {
635 BUG_ON(gfs2_is_stuffed(ip));
636 ret = 0;
637 goto out;
638 }
639
640 /* At this point ret is the tree depth of already allocated blocks */
641 ret = gfs2_bmap_alloc(inode, lblock, bh_map, &mp, ret, height, maxlen);
642 goto out;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400643}
644
Steven Whitehouse941e6d72008-01-28 08:47:38 +0000645/*
646 * Deprecated: do not use in new code
647 */
Steven Whitehousefd88de562006-05-05 16:59:11 -0400648int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen)
649{
Steven Whitehouse23591252006-10-13 17:25:45 -0400650 struct buffer_head bh = { .b_state = 0, .b_blocknr = 0 };
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -0400651 int ret;
Steven Whitehousefd88de562006-05-05 16:59:11 -0400652 int create = *new;
653
654 BUG_ON(!extlen);
655 BUG_ON(!dblock);
656 BUG_ON(!new);
657
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +0000658 bh.b_size = 1 << (inode->i_blkbits + (create ? 0 : 5));
Bob Petersone9e1ef22007-12-10 14:13:27 -0600659 ret = gfs2_block_map(inode, lblock, &bh, create);
Steven Whitehouse7a6bbac2006-09-18 17:18:23 -0400660 *extlen = bh.b_size >> inode->i_blkbits;
661 *dblock = bh.b_blocknr;
662 if (buffer_new(&bh))
663 *new = 1;
664 else
665 *new = 0;
666 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000667}
668
669/**
670 * recursive_scan - recursively scan through the end of a file
671 * @ip: the inode
672 * @dibh: the dinode buffer
673 * @mp: the path through the metadata to the point to start
674 * @height: the height the recursion is at
675 * @block: the indirect block to look at
676 * @first: 1 if this is the first block
677 * @bc: the call to make for each piece of metadata
678 * @data: data opaque to this function to pass to @bc
679 *
680 * When this is first called @height and @block should be zero and
681 * @first should be 1.
682 *
683 * Returns: errno
684 */
685
686static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh,
687 struct metapath *mp, unsigned int height,
Steven Whitehousecd915492006-09-04 12:49:07 -0400688 u64 block, int first, block_call_t bc,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000689 void *data)
690{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400691 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000692 struct buffer_head *bh = NULL;
Al Virob44b84d2006-10-14 10:46:30 -0400693 __be64 *top, *bottom;
Steven Whitehousecd915492006-09-04 12:49:07 -0400694 u64 bn;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000695 int error;
696 int mh_size = sizeof(struct gfs2_meta_header);
697
698 if (!height) {
699 error = gfs2_meta_inode_buffer(ip, &bh);
700 if (error)
701 return error;
702 dibh = bh;
703
Al Virob44b84d2006-10-14 10:46:30 -0400704 top = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0];
705 bottom = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + sdp->sd_diptrs;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000706 } else {
707 error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh);
708 if (error)
709 return error;
710
Al Virob44b84d2006-10-14 10:46:30 -0400711 top = (__be64 *)(bh->b_data + mh_size) +
Jan Engelhardtc53921242006-09-05 14:30:40 +0200712 (first ? mp->mp_list[height] : 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000713
Al Virob44b84d2006-10-14 10:46:30 -0400714 bottom = (__be64 *)(bh->b_data + mh_size) + sdp->sd_inptrs;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000715 }
716
717 error = bc(ip, dibh, bh, top, bottom, height, data);
718 if (error)
719 goto out;
720
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000721 if (height < ip->i_height - 1)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000722 for (; top < bottom; top++, first = 0) {
723 if (!*top)
724 continue;
725
726 bn = be64_to_cpu(*top);
727
728 error = recursive_scan(ip, dibh, mp, height + 1, bn,
729 first, bc, data);
730 if (error)
731 break;
732 }
733
Steven Whitehousea91ea692006-09-04 12:04:26 -0400734out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000735 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000736 return error;
737}
738
739/**
740 * do_strip - Look for a layer a particular layer of the file and strip it off
741 * @ip: the inode
742 * @dibh: the dinode buffer
743 * @bh: A buffer of pointers
744 * @top: The first pointer in the buffer
745 * @bottom: One more than the last pointer
746 * @height: the height this buffer is at
747 * @data: a pointer to a struct strip_mine
748 *
749 * Returns: errno
750 */
751
752static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
Al Virob44b84d2006-10-14 10:46:30 -0400753 struct buffer_head *bh, __be64 *top, __be64 *bottom,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000754 unsigned int height, void *data)
755{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400756 struct strip_mine *sm = data;
757 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000758 struct gfs2_rgrp_list rlist;
Steven Whitehousecd915492006-09-04 12:49:07 -0400759 u64 bn, bstart;
760 u32 blen;
Al Virob44b84d2006-10-14 10:46:30 -0400761 __be64 *p;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000762 unsigned int rg_blocks = 0;
763 int metadata;
764 unsigned int revokes = 0;
765 int x;
766 int error;
767
768 if (!*top)
769 sm->sm_first = 0;
770
771 if (height != sm->sm_height)
772 return 0;
773
774 if (sm->sm_first) {
775 top++;
776 sm->sm_first = 0;
777 }
778
Steven Whitehouseecc30c72008-01-28 10:37:35 +0000779 metadata = (height != ip->i_height - 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000780 if (metadata)
781 revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs;
782
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000783 error = gfs2_rindex_hold(sdp, &ip->i_alloc->al_ri_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000784 if (error)
785 return error;
786
787 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
788 bstart = 0;
789 blen = 0;
790
791 for (p = top; p < bottom; p++) {
792 if (!*p)
793 continue;
794
795 bn = be64_to_cpu(*p);
796
797 if (bstart + blen == bn)
798 blen++;
799 else {
800 if (bstart)
801 gfs2_rlist_add(sdp, &rlist, bstart);
802
803 bstart = bn;
804 blen = 1;
805 }
806 }
807
808 if (bstart)
809 gfs2_rlist_add(sdp, &rlist, bstart);
810 else
811 goto out; /* Nothing to do */
812
Bob Petersonfe6c9912008-01-28 11:13:02 -0600813 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000814
815 for (x = 0; x < rlist.rl_rgrps; x++) {
816 struct gfs2_rgrpd *rgd;
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500817 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100818 rg_blocks += rgd->rd_length;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000819 }
820
821 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
822 if (error)
823 goto out_rlist;
824
825 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE +
826 RES_INDIRECT + RES_STATFS + RES_QUOTA,
827 revokes);
828 if (error)
829 goto out_rg_gunlock;
830
831 down_write(&ip->i_rw_mutex);
832
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000833 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
834 gfs2_trans_add_bh(ip->i_gl, bh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000835
836 bstart = 0;
837 blen = 0;
838
839 for (p = top; p < bottom; p++) {
840 if (!*p)
841 continue;
842
843 bn = be64_to_cpu(*p);
844
845 if (bstart + blen == bn)
846 blen++;
847 else {
848 if (bstart) {
849 if (metadata)
850 gfs2_free_meta(ip, bstart, blen);
851 else
852 gfs2_free_data(ip, bstart, blen);
853 }
854
855 bstart = bn;
856 blen = 1;
857 }
858
859 *p = 0;
Steven Whitehouse77658aa2008-02-12 14:17:27 +0000860 gfs2_add_inode_blocks(&ip->i_inode, -1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000861 }
862 if (bstart) {
863 if (metadata)
864 gfs2_free_meta(ip, bstart, blen);
865 else
866 gfs2_free_data(ip, bstart, blen);
867 }
868
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +0100869 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000870
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500871 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000872
873 up_write(&ip->i_rw_mutex);
874
875 gfs2_trans_end(sdp);
876
Steven Whitehousea91ea692006-09-04 12:04:26 -0400877out_rg_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000878 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400879out_rlist:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000880 gfs2_rlist_free(&rlist);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400881out:
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000882 gfs2_glock_dq_uninit(&ip->i_alloc->al_ri_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000883 return error;
884}
885
886/**
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400887 * gfs2_block_truncate_page - Deal with zeroing out data for truncate
888 *
889 * This is partly borrowed from ext3.
890 */
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100891static int gfs2_block_truncate_page(struct address_space *mapping, loff_t from)
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400892{
893 struct inode *inode = mapping->host;
894 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400895 unsigned long index = from >> PAGE_CACHE_SHIFT;
896 unsigned offset = from & (PAGE_CACHE_SIZE-1);
897 unsigned blocksize, iblock, length, pos;
898 struct buffer_head *bh;
899 struct page *page;
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400900 int err;
901
902 page = grab_cache_page(mapping, index);
903 if (!page)
904 return 0;
905
906 blocksize = inode->i_sb->s_blocksize;
907 length = blocksize - (offset & (blocksize - 1));
908 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
909
910 if (!page_has_buffers(page))
911 create_empty_buffers(page, blocksize, 0);
912
913 /* Find the buffer that contains "offset" */
914 bh = page_buffers(page);
915 pos = blocksize;
916 while (offset >= pos) {
917 bh = bh->b_this_page;
918 iblock++;
919 pos += blocksize;
920 }
921
922 err = 0;
923
924 if (!buffer_mapped(bh)) {
Bob Petersone9e1ef22007-12-10 14:13:27 -0600925 gfs2_block_map(inode, iblock, bh, 0);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400926 /* unmapped? It's a hole - nothing to do */
927 if (!buffer_mapped(bh))
928 goto unlock;
929 }
930
931 /* Ok, it's mapped. Make sure it's up-to-date */
932 if (PageUptodate(page))
933 set_buffer_uptodate(bh);
934
935 if (!buffer_uptodate(bh)) {
936 err = -EIO;
937 ll_rw_block(READ, 1, &bh);
938 wait_on_buffer(bh);
939 /* Uhhuh. Read error. Complain and punt. */
940 if (!buffer_uptodate(bh))
941 goto unlock;
S. Wendy Cheng1875f2f2007-06-25 21:14:31 -0400942 err = 0;
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400943 }
944
Steven Whitehousebf36a712007-10-17 08:35:19 +0100945 if (!gfs2_is_writeback(ip))
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400946 gfs2_trans_add_bh(ip->i_gl, bh, 0);
947
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800948 zero_user(page, offset, length);
Steven Whitehouse40bc9a22009-06-10 09:09:40 +0100949 mark_buffer_dirty(bh);
Steven Whitehouseba7f7292006-07-26 11:27:10 -0400950unlock:
951 unlock_page(page);
952 page_cache_release(page);
953 return err;
954}
955
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100956static int trunc_start(struct inode *inode, u64 oldsize, u64 newsize)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000957{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100958 struct gfs2_inode *ip = GFS2_I(inode);
959 struct gfs2_sbd *sdp = GFS2_SB(inode);
960 struct address_space *mapping = inode->i_mapping;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000961 struct buffer_head *dibh;
962 int journaled = gfs2_is_jdata(ip);
963 int error;
964
965 error = gfs2_trans_begin(sdp,
Jan Engelhardtc53921242006-09-05 14:30:40 +0200966 RES_DINODE + (journaled ? RES_JDATA : 0), 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000967 if (error)
968 return error;
969
970 error = gfs2_meta_inode_buffer(ip, &dibh);
971 if (error)
972 goto out;
973
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100974 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000975
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100976 if (gfs2_is_stuffed(ip)) {
977 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + newsize);
978 } else {
979 if (newsize & (u64)(sdp->sd_sb.sb_bsize - 1)) {
980 error = gfs2_block_truncate_page(mapping, newsize);
981 if (error)
982 goto out_brelse;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000983 }
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100984 ip->i_diskflags |= GFS2_DIF_TRUNC_IN_PROG;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000985 }
986
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100987 i_size_write(inode, newsize);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100988 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
989 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000990
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100991 truncate_pagecache(inode, oldsize, newsize);
992out_brelse:
993 brelse(dibh);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400994out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000995 gfs2_trans_end(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000996 return error;
997}
998
Steven Whitehousecd915492006-09-04 12:49:07 -0400999static int trunc_dealloc(struct gfs2_inode *ip, u64 size)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001000{
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +00001001 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouseecc30c72008-01-28 10:37:35 +00001002 unsigned int height = ip->i_height;
Steven Whitehousecd915492006-09-04 12:49:07 -04001003 u64 lblock;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001004 struct metapath mp;
1005 int error;
1006
1007 if (!size)
1008 lblock = 0;
Steven Whitehouse18ec7d52006-02-08 11:50:51 +00001009 else
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +00001010 lblock = (size - 1) >> sdp->sd_sb.sb_bsize_shift;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001011
Steven Whitehouse9b8c81d2008-02-22 16:09:31 +00001012 find_metapath(sdp, lblock, &mp, ip->i_height);
Cyrill Gorcunov182fe5a2008-03-03 21:54:21 +03001013 if (!gfs2_alloc_get(ip))
1014 return -ENOMEM;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001015
1016 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1017 if (error)
1018 goto out;
1019
1020 while (height--) {
1021 struct strip_mine sm;
1022 sm.sm_first = !!size;
1023 sm.sm_height = height;
1024
1025 error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm);
1026 if (error)
1027 break;
1028 }
1029
1030 gfs2_quota_unhold(ip);
1031
Steven Whitehousea91ea692006-09-04 12:04:26 -04001032out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001033 gfs2_alloc_put(ip);
1034 return error;
1035}
1036
1037static int trunc_end(struct gfs2_inode *ip)
1038{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001039 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001040 struct buffer_head *dibh;
1041 int error;
1042
1043 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1044 if (error)
1045 return error;
1046
1047 down_write(&ip->i_rw_mutex);
1048
1049 error = gfs2_meta_inode_buffer(ip, &dibh);
1050 if (error)
1051 goto out;
1052
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001053 if (!i_size_read(&ip->i_inode)) {
Steven Whitehouseecc30c72008-01-28 10:37:35 +00001054 ip->i_height = 0;
Steven Whitehousece276b02008-02-06 09:25:45 +00001055 ip->i_goal = ip->i_no_addr;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001056 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
1057 }
Steven Whitehouse4bd91ba2007-06-05 09:39:18 +01001058 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouse383f01f2008-11-04 10:05:22 +00001059 ip->i_diskflags &= ~GFS2_DIF_TRUNC_IN_PROG;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001060
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +00001061 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
Steven Whitehouse539e5d62006-10-31 15:07:05 -05001062 gfs2_dinode_out(ip, dibh->b_data);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001063 brelse(dibh);
1064
Steven Whitehousea91ea692006-09-04 12:04:26 -04001065out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001066 up_write(&ip->i_rw_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001067 gfs2_trans_end(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001068 return error;
1069}
1070
1071/**
1072 * do_shrink - make a file smaller
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001073 * @inode: the inode
1074 * @oldsize: the current inode size
1075 * @newsize: the size to make the file
David Teiglandb3b94fa2006-01-16 16:50:04 +00001076 *
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001077 * Called with an exclusive lock on @inode. The @size must
1078 * be equal to or smaller than the current inode size.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001079 *
1080 * Returns: errno
1081 */
1082
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001083static int do_shrink(struct inode *inode, u64 oldsize, u64 newsize)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001084{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001085 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001086 int error;
1087
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001088 error = trunc_start(inode, oldsize, newsize);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001089 if (error < 0)
1090 return error;
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001091 if (gfs2_is_stuffed(ip))
David Teiglandb3b94fa2006-01-16 16:50:04 +00001092 return 0;
1093
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001094 error = trunc_dealloc(ip, newsize);
1095 if (error == 0)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001096 error = trunc_end(ip);
1097
1098 return error;
1099}
1100
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001101void gfs2_trim_blocks(struct inode *inode)
Wendy Chenga13b8c52007-08-20 09:29:53 -04001102{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001103 u64 size = inode->i_size;
1104 int ret;
1105
1106 ret = do_shrink(inode, size, size);
1107 WARN_ON(ret != 0);
1108}
1109
1110/**
1111 * do_grow - Touch and update inode size
1112 * @inode: The inode
1113 * @size: The new size
1114 *
1115 * This function updates the timestamps on the inode and
1116 * may also increase the size of the inode. This function
1117 * must not be called with @size any smaller than the current
1118 * inode size.
1119 *
1120 * Although it is not strictly required to unstuff files here,
1121 * earlier versions of GFS2 have a bug in the stuffed file reading
1122 * code which will result in a buffer overrun if the size is larger
1123 * than the max stuffed file size. In order to prevent this from
1124 * occuring, such files are unstuffed, but in other cases we can
1125 * just update the inode size directly.
1126 *
1127 * Returns: 0 on success, or -ve on error
1128 */
1129
1130static int do_grow(struct inode *inode, u64 size)
1131{
1132 struct gfs2_inode *ip = GFS2_I(inode);
1133 struct gfs2_sbd *sdp = GFS2_SB(inode);
Wendy Chenga13b8c52007-08-20 09:29:53 -04001134 struct buffer_head *dibh;
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001135 struct gfs2_alloc *al = NULL;
Wendy Chenga13b8c52007-08-20 09:29:53 -04001136 int error;
1137
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001138 if (gfs2_is_stuffed(ip) &&
1139 (size > (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)))) {
1140 al = gfs2_alloc_get(ip);
1141 if (al == NULL)
1142 return -ENOMEM;
Wendy Chenga13b8c52007-08-20 09:29:53 -04001143
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001144 error = gfs2_quota_lock_check(ip);
1145 if (error)
1146 goto do_grow_alloc_put;
1147
1148 al->al_requested = 1;
1149 error = gfs2_inplace_reserve(ip);
1150 if (error)
1151 goto do_grow_qunlock;
1152 }
1153
Benjamin Marzinskibf97b672010-09-27 16:00:04 -05001154 error = gfs2_trans_begin(sdp, RES_DINODE + RES_STATFS + RES_RG_BIT, 0);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001155 if (error)
1156 goto do_grow_release;
1157
1158 if (al) {
1159 error = gfs2_unstuff_dinode(ip, NULL);
1160 if (error)
1161 goto do_end_trans;
1162 }
Wendy Chenga13b8c52007-08-20 09:29:53 -04001163
1164 error = gfs2_meta_inode_buffer(ip, &dibh);
1165 if (error)
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001166 goto do_end_trans;
Wendy Chenga13b8c52007-08-20 09:29:53 -04001167
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001168 i_size_write(inode, size);
Wendy Chenga13b8c52007-08-20 09:29:53 -04001169 ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
1170 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1171 gfs2_dinode_out(ip, dibh->b_data);
1172 brelse(dibh);
1173
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001174do_end_trans:
Wendy Chenga13b8c52007-08-20 09:29:53 -04001175 gfs2_trans_end(sdp);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001176do_grow_release:
1177 if (al) {
1178 gfs2_inplace_release(ip);
1179do_grow_qunlock:
1180 gfs2_quota_unlock(ip);
1181do_grow_alloc_put:
1182 gfs2_alloc_put(ip);
1183 }
Wendy Chenga13b8c52007-08-20 09:29:53 -04001184 return error;
1185}
1186
David Teiglandb3b94fa2006-01-16 16:50:04 +00001187/**
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001188 * gfs2_setattr_size - make a file a given size
1189 * @inode: the inode
1190 * @newsize: the size to make the file
David Teiglandb3b94fa2006-01-16 16:50:04 +00001191 *
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001192 * The file size can grow, shrink, or stay the same size. This
1193 * is called holding i_mutex and an exclusive glock on the inode
1194 * in question.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001195 *
1196 * Returns: errno
1197 */
1198
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001199int gfs2_setattr_size(struct inode *inode, u64 newsize)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001200{
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001201 int ret;
1202 u64 oldsize;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001203
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001204 BUG_ON(!S_ISREG(inode->i_mode));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001205
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001206 ret = inode_newsize_ok(inode, newsize);
1207 if (ret)
1208 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001209
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001210 oldsize = inode->i_size;
1211 if (newsize >= oldsize)
1212 return do_grow(inode, newsize);
1213
1214 return do_shrink(inode, oldsize, newsize);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001215}
1216
1217int gfs2_truncatei_resume(struct gfs2_inode *ip)
1218{
1219 int error;
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001220 error = trunc_dealloc(ip, i_size_read(&ip->i_inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001221 if (!error)
1222 error = trunc_end(ip);
1223 return error;
1224}
1225
1226int gfs2_file_dealloc(struct gfs2_inode *ip)
1227{
1228 return trunc_dealloc(ip, 0);
1229}
1230
1231/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001232 * gfs2_write_alloc_required - figure out if a write will require an allocation
1233 * @ip: the file being written to
1234 * @offset: the offset to write to
1235 * @len: the number of bytes being written
David Teiglandb3b94fa2006-01-16 16:50:04 +00001236 *
Bob Peterson461cb412010-06-24 19:21:20 -04001237 * Returns: 1 if an alloc is required, 0 otherwise
David Teiglandb3b94fa2006-01-16 16:50:04 +00001238 */
1239
Steven Whitehousecd915492006-09-04 12:49:07 -04001240int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
Bob Peterson461cb412010-06-24 19:21:20 -04001241 unsigned int len)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001242{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001243 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001244 struct buffer_head bh;
1245 unsigned int shift;
1246 u64 lblock, lblock_stop, size;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +00001247 u64 end_of_file;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001248
David Teiglandb3b94fa2006-01-16 16:50:04 +00001249 if (!len)
1250 return 0;
1251
1252 if (gfs2_is_stuffed(ip)) {
1253 if (offset + len >
1254 sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode))
Bob Peterson461cb412010-06-24 19:21:20 -04001255 return 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001256 return 0;
1257 }
1258
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001259 shift = sdp->sd_sb.sb_bsize_shift;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +00001260 BUG_ON(gfs2_is_dir(ip));
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001261 end_of_file = (i_size_read(&ip->i_inode) + sdp->sd_sb.sb_bsize - 1) >> shift;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +00001262 lblock = offset >> shift;
1263 lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift;
1264 if (lblock_stop > end_of_file)
Bob Peterson461cb412010-06-24 19:21:20 -04001265 return 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001266
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001267 size = (lblock_stop - lblock) << shift;
1268 do {
1269 bh.b_state = 0;
1270 bh.b_size = size;
1271 gfs2_block_map(&ip->i_inode, lblock, &bh, 0);
1272 if (!buffer_mapped(&bh))
Bob Peterson461cb412010-06-24 19:21:20 -04001273 return 1;
Steven Whitehouse941e6d72008-01-28 08:47:38 +00001274 size -= bh.b_size;
1275 lblock += (bh.b_size >> ip->i_inode.i_blkbits);
1276 } while(size > 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001277
1278 return 0;
1279}
1280