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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Jeff Mahoney098297b2014-04-23 10:00:36 -04002 * Copyright 1999 Hans Reiser, see reiserfs/README for licensing and copyright
3 * details
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 */
5
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <linux/time.h>
7#include <linux/pagemap.h>
8#include <linux/buffer_head.h>
Al Virof466c6f2012-03-17 01:16:43 -04009#include "reiserfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
Jeff Mahoney098297b2014-04-23 10:00:36 -040011/*
12 * access to tail : when one is going to read tail it must make sure, that is
13 * not running. direct2indirect and indirect2direct can not run concurrently
14 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
Jeff Mahoney098297b2014-04-23 10:00:36 -040016/*
17 * Converts direct items to an unformatted node. Panics if file has no
18 * tail. -ENOSPC if no disk space for conversion
19 */
20/*
21 * path points to first direct item of the file regardless of how many of
22 * them are there
23 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070024int direct2indirect(struct reiserfs_transaction_handle *th, struct inode *inode,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -080025 struct treepath *path, struct buffer_head *unbh,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070026 loff_t tail_offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -070027{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070028 struct super_block *sb = inode->i_sb;
29 struct buffer_head *up_to_date_bh;
Jeff Mahoney4cf5f7a2014-04-23 10:00:35 -040030 struct item_head *p_le_ih = tp_item_head(path);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070031 unsigned long total_tail = 0;
Jeff Mahoney098297b2014-04-23 10:00:36 -040032
33 /* Key to search for the last byte of the converted item. */
34 struct cpu_key end_key;
35
36 /*
37 * new indirect item to be inserted or key
38 * of unfm pointer to be pasted
39 */
40 struct item_head ind_ih;
41 int blk_size;
42 /* returned value for reiserfs_insert_item and clones */
43 int retval;
44 /* Handle on an unformatted node that will be inserted in the tree. */
45 unp_t unfm_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070047 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070049 REISERFS_SB(sb)->s_direct2indirect++;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Jeff Mahoneyee939612009-03-30 14:02:50 -040051 blk_size = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Jeff Mahoney098297b2014-04-23 10:00:36 -040053 /*
54 * and key to search for append or insert pointer to the new
55 * unformatted node.
56 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070057 copy_item_head(&ind_ih, p_le_ih);
58 set_le_ih_k_offset(&ind_ih, tail_offset);
59 set_le_ih_k_type(&ind_ih, TYPE_INDIRECT);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070061 /* Set the key to search for the place for new unfm pointer */
62 make_cpu_key(&end_key, inode, tail_offset, TYPE_INDIRECT, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Jeff Mahoney0222e652009-03-30 14:02:44 -040064 /* FIXME: we could avoid this */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070065 if (search_for_position_by_key(sb, &end_key, path) == POSITION_FOUND) {
Jeff Mahoney0030b642009-03-30 14:02:28 -040066 reiserfs_error(sb, "PAP-14030",
67 "pasted or inserted byte exists in "
68 "the tree %K. Use fsck to repair.", &end_key);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070069 pathrelse(path);
70 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Jeff Mahoney4cf5f7a2014-04-23 10:00:35 -040073 p_le_ih = tp_item_head(path);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070075 unfm_ptr = cpu_to_le32(unbh->b_blocknr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070077 if (is_statdata_le_ih(p_le_ih)) {
78 /* Insert new indirect item. */
79 set_ih_free_space(&ind_ih, 0); /* delete at nearest future */
80 put_ih_item_len(&ind_ih, UNFM_P_SIZE);
81 PATH_LAST_POSITION(path)++;
Jeff Mahoneyee939612009-03-30 14:02:50 -040082 retval =
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070083 reiserfs_insert_item(th, path, &end_key, &ind_ih, inode,
84 (char *)&unfm_ptr);
85 } else {
86 /* Paste into last indirect item of an object. */
Jeff Mahoneyee939612009-03-30 14:02:50 -040087 retval = reiserfs_paste_into_item(th, path, &end_key, inode,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070088 (char *)&unfm_ptr,
89 UNFM_P_SIZE);
90 }
Jeff Mahoneyee939612009-03-30 14:02:50 -040091 if (retval) {
92 return retval;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070093 }
Jeff Mahoney098297b2014-04-23 10:00:36 -040094 /*
95 * note: from here there are two keys which have matching first
96 * three key components. They only differ by the fourth one.
97 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070099 /* Set the key to search for the direct items of the file */
100 make_cpu_key(&end_key, inode, max_reiserfs_offset(inode), TYPE_DIRECT,
101 4);
102
Jeff Mahoney098297b2014-04-23 10:00:36 -0400103 /*
104 * Move bytes from the direct items to the new unformatted node
105 * and delete them.
106 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700107 while (1) {
108 int tail_size;
109
Jeff Mahoney098297b2014-04-23 10:00:36 -0400110 /*
111 * end_key.k_offset is set so, that we will always have found
112 * last item of the file
113 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700114 if (search_for_position_by_key(sb, &end_key, path) ==
115 POSITION_FOUND)
Jeff Mahoneyc3a9c212009-03-30 14:02:25 -0400116 reiserfs_panic(sb, "PAP-14050",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700117 "direct item (%K) not found", &end_key);
Jeff Mahoney4cf5f7a2014-04-23 10:00:35 -0400118 p_le_ih = tp_item_head(path);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700119 RFALSE(!is_direct_le_ih(p_le_ih),
120 "vs-14055: direct item expected(%K), found %h",
121 &end_key, p_le_ih);
Jeff Mahoneyee939612009-03-30 14:02:50 -0400122 tail_size = (le_ih_k_offset(p_le_ih) & (blk_size - 1))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700123 + ih_item_len(p_le_ih) - 1;
124
Jeff Mahoney098297b2014-04-23 10:00:36 -0400125 /*
126 * we only send the unbh pointer if the buffer is not
127 * up to date. this avoids overwriting good data from
128 * writepage() with old data from the disk or buffer cache
129 * Special case: unbh->b_page will be NULL if we are coming
130 * through DIRECT_IO handler here.
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700131 */
132 if (!unbh->b_page || buffer_uptodate(unbh)
133 || PageUptodate(unbh->b_page)) {
134 up_to_date_bh = NULL;
135 } else {
136 up_to_date_bh = unbh;
137 }
Jeff Mahoneyee939612009-03-30 14:02:50 -0400138 retval = reiserfs_delete_item(th, path, &end_key, inode,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700139 up_to_date_bh);
140
Jeff Mahoneyee939612009-03-30 14:02:50 -0400141 total_tail += retval;
Jeff Mahoney098297b2014-04-23 10:00:36 -0400142
143 /* done: file does not have direct items anymore */
Jeff Mahoneyee939612009-03-30 14:02:50 -0400144 if (tail_size == retval)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700145 break;
146
147 }
Jeff Mahoney098297b2014-04-23 10:00:36 -0400148 /*
149 * if we've copied bytes from disk into the page, we need to zero
150 * out the unused part of the block (it was not up to date before)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700151 */
152 if (up_to_date_bh) {
153 unsigned pgoff =
154 (tail_offset + total_tail - 1) & (PAGE_CACHE_SIZE - 1);
Cong Wang883da602011-11-25 23:14:35 +0800155 char *kaddr = kmap_atomic(up_to_date_bh->b_page);
Jeff Mahoneyee939612009-03-30 14:02:50 -0400156 memset(kaddr + pgoff, 0, blk_size - total_tail);
Cong Wang883da602011-11-25 23:14:35 +0800157 kunmap_atomic(kaddr);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700158 }
159
160 REISERFS_I(inode)->i_first_direct_byte = U32_MAX;
161
162 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163}
164
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165/* stolen from fs/buffer.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700166void reiserfs_unmap_buffer(struct buffer_head *bh)
167{
168 lock_buffer(bh);
169 if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
170 BUG();
171 }
172 clear_buffer_dirty(bh);
Jeff Mahoney098297b2014-04-23 10:00:36 -0400173 /*
174 * Remove the buffer from whatever list it belongs to. We are mostly
175 * interested in removing it from per-sb j_dirty_buffers list, to avoid
176 * BUG() on attempt to write not mapped buffer
177 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700178 if ((!list_empty(&bh->b_assoc_buffers) || bh->b_private) && bh->b_page) {
179 struct inode *inode = bh->b_page->mapping->host;
180 struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
181 spin_lock(&j->j_dirty_buffers_lock);
182 list_del_init(&bh->b_assoc_buffers);
183 reiserfs_free_jh(bh);
184 spin_unlock(&j->j_dirty_buffers_lock);
185 }
186 clear_buffer_mapped(bh);
187 clear_buffer_req(bh);
188 clear_buffer_new(bh);
189 bh->b_bdev = NULL;
190 unlock_buffer(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191}
192
Jeff Mahoney098297b2014-04-23 10:00:36 -0400193/*
194 * this first locks inode (neither reads nor sync are permitted),
195 * reads tail through page cache, insert direct item. When direct item
196 * inserted successfully inode is left locked. Return value is always
197 * what we expect from it (number of cut bytes). But when tail remains
198 * in the unformatted node, we set mode to SKIP_BALANCING and unlock
199 * inode
200 */
Jeff Mahoney995c7622009-03-30 14:02:47 -0400201int indirect2direct(struct reiserfs_transaction_handle *th,
202 struct inode *inode, struct page *page,
Jeff Mahoneyd68caa92009-03-30 14:02:49 -0400203 struct treepath *path, /* path to the indirect item. */
204 const struct cpu_key *item_key, /* Key to look for
205 * unformatted node
206 * pointer to be cut. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700207 loff_t n_new_file_size, /* New file size. */
Jeff Mahoneyd68caa92009-03-30 14:02:49 -0400208 char *mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
Jeff Mahoney995c7622009-03-30 14:02:47 -0400210 struct super_block *sb = inode->i_sb;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700211 struct item_head s_ih;
Jeff Mahoneyee939612009-03-30 14:02:50 -0400212 unsigned long block_size = sb->s_blocksize;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700213 char *tail;
214 int tail_len, round_tail_len;
215 loff_t pos, pos1; /* position of first byte of the tail */
216 struct cpu_key key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700218 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Jeff Mahoneya9dd3642009-03-30 14:02:45 -0400220 REISERFS_SB(sb)->s_indirect2direct++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Jeff Mahoneyd68caa92009-03-30 14:02:49 -0400222 *mode = M_SKIP_BALANCING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700224 /* store item head path points to. */
Jeff Mahoney4cf5f7a2014-04-23 10:00:35 -0400225 copy_item_head(&s_ih, tp_item_head(path));
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700226
Jeff Mahoneyee939612009-03-30 14:02:50 -0400227 tail_len = (n_new_file_size & (block_size - 1));
Jeff Mahoney995c7622009-03-30 14:02:47 -0400228 if (get_inode_sd_version(inode) == STAT_DATA_V2)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700229 round_tail_len = ROUND_UP(tail_len);
230 else
231 round_tail_len = tail_len;
232
233 pos =
234 le_ih_k_offset(&s_ih) - 1 + (ih_item_len(&s_ih) / UNFM_P_SIZE -
Jeff Mahoneya9dd3642009-03-30 14:02:45 -0400235 1) * sb->s_blocksize;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700236 pos1 = pos;
237
Jeff Mahoney098297b2014-04-23 10:00:36 -0400238 /*
239 * we are protected by i_mutex. The tail can not disapper, not
240 * append can be done either
241 * we are in truncate or packing tail in file_release
242 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700243
244 tail = (char *)kmap(page); /* this can schedule */
245
Jeff Mahoneyd68caa92009-03-30 14:02:49 -0400246 if (path_changed(&s_ih, path)) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700247 /* re-search indirect item */
Jeff Mahoneyd68caa92009-03-30 14:02:49 -0400248 if (search_for_position_by_key(sb, item_key, path)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700249 == POSITION_NOT_FOUND)
Jeff Mahoneya9dd3642009-03-30 14:02:45 -0400250 reiserfs_panic(sb, "PAP-5520",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700251 "item to be converted %K does not exist",
Jeff Mahoneyd68caa92009-03-30 14:02:49 -0400252 item_key);
Jeff Mahoney4cf5f7a2014-04-23 10:00:35 -0400253 copy_item_head(&s_ih, tp_item_head(path));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700255 pos = le_ih_k_offset(&s_ih) - 1 +
256 (ih_item_len(&s_ih) / UNFM_P_SIZE -
Jeff Mahoneya9dd3642009-03-30 14:02:45 -0400257 1) * sb->s_blocksize;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700258 if (pos != pos1)
Jeff Mahoneya9dd3642009-03-30 14:02:45 -0400259 reiserfs_panic(sb, "vs-5530", "tail position "
Jeff Mahoneyc3a9c212009-03-30 14:02:25 -0400260 "changed while we were reading it");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700262 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700264 /* Set direct item header to insert. */
Jeff Mahoney995c7622009-03-30 14:02:47 -0400265 make_le_item_head(&s_ih, NULL, get_inode_item_key_version(inode),
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700266 pos1 + 1, TYPE_DIRECT, round_tail_len,
267 0xffff /*ih_free_space */ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
Jeff Mahoney098297b2014-04-23 10:00:36 -0400269 /*
270 * we want a pointer to the first byte of the tail in the page.
271 * the page was locked and this part of the page was up to date when
272 * indirect2direct was called, so we know the bytes are still valid
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700273 */
274 tail = tail + (pos & (PAGE_CACHE_SIZE - 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
Jeff Mahoneyd68caa92009-03-30 14:02:49 -0400276 PATH_LAST_POSITION(path)++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Jeff Mahoneyd68caa92009-03-30 14:02:49 -0400278 key = *item_key;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700279 set_cpu_key_k_type(&key, TYPE_DIRECT);
280 key.key_length = 4;
281 /* Insert tail as new direct item in the tree */
Jeff Mahoneyd68caa92009-03-30 14:02:49 -0400282 if (reiserfs_insert_item(th, path, &key, &s_ih, inode,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700283 tail ? tail : NULL) < 0) {
Jeff Mahoney098297b2014-04-23 10:00:36 -0400284 /*
285 * No disk memory. So we can not convert last unformatted node
286 * to the direct item. In this case we used to adjust
287 * indirect items's ih_free_space. Now ih_free_space is not
288 * used, it would be ideal to write zeros to corresponding
289 * unformatted node. For now i_size is considered as guard for
290 * going out of file size
291 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700292 kunmap(page);
Jeff Mahoneyee939612009-03-30 14:02:50 -0400293 return block_size - round_tail_len;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700294 }
295 kunmap(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700297 /* make sure to get the i_blocks changes from reiserfs_insert_item */
Jeff Mahoney995c7622009-03-30 14:02:47 -0400298 reiserfs_update_sd(th, inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700299
Jeff Mahoney098297b2014-04-23 10:00:36 -0400300 /*
301 * note: we have now the same as in above direct2indirect
302 * conversion: there are two keys which have matching first three
303 * key components. They only differ by the fourth one.
304 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700305
Jeff Mahoney098297b2014-04-23 10:00:36 -0400306 /*
307 * We have inserted new direct item and must remove last
308 * unformatted node.
309 */
Jeff Mahoneyd68caa92009-03-30 14:02:49 -0400310 *mode = M_CUT;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700311
312 /* we store position of first direct item in the in-core inode */
Jeff Mahoney995c7622009-03-30 14:02:47 -0400313 /* mark_file_with_tail (inode, pos1 + 1); */
314 REISERFS_I(inode)->i_first_direct_byte = pos1 + 1;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700315
Jeff Mahoneyee939612009-03-30 14:02:50 -0400316 return block_size - round_tail_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317}