David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
Steven Whitehouse | 3a8a9a1 | 2006-05-18 15:09:15 -0400 | [diff] [blame] | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 4 | * |
| 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 Whitehouse | e9fc2aa | 2006-09-01 11:05:15 -0400 | [diff] [blame] | 7 | * of the GNU General Public License version 2. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 8 | */ |
| 9 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 10 | #include <linux/slab.h> |
| 11 | #include <linux/spinlock.h> |
| 12 | #include <linux/completion.h> |
| 13 | #include <linux/buffer_head.h> |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 14 | #include <linux/gfs2_ondisk.h> |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 15 | #include <linux/crc32.h> |
Fabio Massimo Di Nitto | 7d30859 | 2006-09-19 07:56:29 +0200 | [diff] [blame] | 16 | #include <linux/lm_interface.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 17 | |
| 18 | #include "gfs2.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 19 | #include "incore.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 20 | #include "bmap.h" |
| 21 | #include "glock.h" |
| 22 | #include "inode.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 23 | #include "meta_io.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 24 | #include "quota.h" |
| 25 | #include "rgrp.h" |
| 26 | #include "trans.h" |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 27 | #include "dir.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 28 | #include "util.h" |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 29 | #include "ops_address.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 30 | |
| 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 | */ |
| 35 | struct metapath { |
| 36 | __u16 mp_list[GFS2_MAX_META_HEIGHT]; |
| 37 | }; |
| 38 | |
| 39 | typedef int (*block_call_t) (struct gfs2_inode *ip, struct buffer_head *dibh, |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 40 | struct buffer_head *bh, __be64 *top, |
| 41 | __be64 *bottom, unsigned int height, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 42 | void *data); |
| 43 | |
| 44 | struct strip_mine { |
| 45 | int sm_first; |
| 46 | unsigned int sm_height; |
| 47 | }; |
| 48 | |
| 49 | /** |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 50 | * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page |
| 51 | * @ip: the inode |
| 52 | * @dibh: the dinode buffer |
| 53 | * @block: the block number that was allocated |
| 54 | * @private: any locked page held by the caller process |
| 55 | * |
| 56 | * Returns: errno |
| 57 | */ |
| 58 | |
| 59 | static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh, |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 60 | u64 block, struct page *page) |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 61 | { |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 62 | struct inode *inode = &ip->i_inode; |
| 63 | struct buffer_head *bh; |
| 64 | int release = 0; |
| 65 | |
| 66 | if (!page || page->index) { |
| 67 | page = grab_cache_page(inode->i_mapping, 0); |
| 68 | if (!page) |
| 69 | return -ENOMEM; |
| 70 | release = 1; |
| 71 | } |
| 72 | |
| 73 | if (!PageUptodate(page)) { |
| 74 | void *kaddr = kmap(page); |
| 75 | |
| 76 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), |
| 77 | ip->i_di.di_size); |
| 78 | memset(kaddr + ip->i_di.di_size, 0, |
| 79 | PAGE_CACHE_SIZE - ip->i_di.di_size); |
| 80 | kunmap(page); |
| 81 | |
| 82 | SetPageUptodate(page); |
| 83 | } |
| 84 | |
| 85 | if (!page_has_buffers(page)) |
| 86 | create_empty_buffers(page, 1 << inode->i_blkbits, |
| 87 | (1 << BH_Uptodate)); |
| 88 | |
| 89 | bh = page_buffers(page); |
| 90 | |
| 91 | if (!buffer_mapped(bh)) |
| 92 | map_bh(bh, inode->i_sb, block); |
| 93 | |
| 94 | set_buffer_uptodate(bh); |
Steven Whitehouse | eaf9652 | 2007-08-27 09:49:37 +0100 | [diff] [blame] | 95 | if (!gfs2_is_jdata(ip)) |
| 96 | mark_buffer_dirty(bh); |
Steven Whitehouse | bf36a71 | 2007-10-17 08:35:19 +0100 | [diff] [blame] | 97 | if (!gfs2_is_writeback(ip)) |
Bob Peterson | 8475487 | 2007-09-02 10:55:29 +0100 | [diff] [blame] | 98 | gfs2_trans_add_bh(ip->i_gl, bh, 0); |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 99 | |
| 100 | if (release) { |
| 101 | unlock_page(page); |
| 102 | page_cache_release(page); |
| 103 | } |
| 104 | |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 109 | * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big |
| 110 | * @ip: The GFS2 inode to unstuff |
| 111 | * @unstuffer: the routine that handles unstuffing a non-zero length file |
| 112 | * @private: private data for the unstuffer |
| 113 | * |
| 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 Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 120 | int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 121 | { |
| 122 | struct buffer_head *bh, *dibh; |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 123 | struct gfs2_dinode *di; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 124 | u64 block = 0; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 125 | int isdir = gfs2_is_dir(ip); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 126 | 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 Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 133 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 134 | if (ip->i_di.di_size) { |
| 135 | /* Get a free block, fill it with the stuffed data, |
| 136 | and write it out to disk */ |
| 137 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 138 | if (isdir) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 139 | block = gfs2_alloc_meta(ip); |
| 140 | |
Steven Whitehouse | 61e085a | 2006-04-24 10:07:13 -0400 | [diff] [blame] | 141 | error = gfs2_dir_get_new_buffer(ip, block, &bh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 142 | if (error) |
| 143 | goto out_brelse; |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 144 | gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_meta_header), |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 145 | dibh, sizeof(struct gfs2_dinode)); |
| 146 | brelse(bh); |
| 147 | } else { |
| 148 | block = gfs2_alloc_data(ip); |
| 149 | |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 150 | error = gfs2_unstuffer_page(ip, dibh, block, page); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 151 | if (error) |
| 152 | goto out_brelse; |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | /* Set up the pointer to the new block */ |
| 157 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 158 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 159 | di = (struct gfs2_dinode *)dibh->b_data; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 160 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
| 161 | |
| 162 | if (ip->i_di.di_size) { |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 163 | *(__be64 *)(di + 1) = cpu_to_be64(block); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 164 | ip->i_di.di_blocks++; |
Steven Whitehouse | 9e2dbda | 2006-11-08 15:45:46 -0500 | [diff] [blame] | 165 | gfs2_set_inode_blocks(&ip->i_inode); |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 166 | di->di_blocks = cpu_to_be64(ip->i_di.di_blocks); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | ip->i_di.di_height = 1; |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 170 | di->di_height = cpu_to_be16(1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 171 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 172 | out_brelse: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 173 | brelse(dibh); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 174 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 175 | up_write(&ip->i_rw_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 176 | return error; |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * calc_tree_height - Calculate the height of a metadata tree |
| 181 | * @ip: The GFS2 inode |
| 182 | * @size: The proposed size of the file |
| 183 | * |
| 184 | * Work out how tall a metadata tree needs to be in order to accommodate a |
| 185 | * file of a particular size. If size is less than the current size of |
| 186 | * the inode, then the current size of the inode is used instead of the |
| 187 | * supplied one. |
| 188 | * |
| 189 | * Returns: the height the tree should be |
| 190 | */ |
| 191 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 192 | static unsigned int calc_tree_height(struct gfs2_inode *ip, u64 size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 193 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 194 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 195 | u64 *arr; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 196 | unsigned int max, height; |
| 197 | |
| 198 | if (ip->i_di.di_size > size) |
| 199 | size = ip->i_di.di_size; |
| 200 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 201 | if (gfs2_is_dir(ip)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 202 | arr = sdp->sd_jheightsize; |
| 203 | max = sdp->sd_max_jheight; |
| 204 | } else { |
| 205 | arr = sdp->sd_heightsize; |
| 206 | max = sdp->sd_max_height; |
| 207 | } |
| 208 | |
| 209 | for (height = 0; height < max; height++) |
| 210 | if (arr[height] >= size) |
| 211 | break; |
| 212 | |
| 213 | return height; |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * build_height - Build a metadata tree of the requested height |
| 218 | * @ip: The GFS2 inode |
| 219 | * @height: The height to build to |
| 220 | * |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 221 | * |
| 222 | * Returns: errno |
| 223 | */ |
| 224 | |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame] | 225 | static int build_height(struct inode *inode, unsigned height) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 226 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 227 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame] | 228 | unsigned new_height = height - ip->i_di.di_height; |
| 229 | struct buffer_head *dibh; |
| 230 | struct buffer_head *blocks[GFS2_MAX_META_HEIGHT]; |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 231 | struct gfs2_dinode *di; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 232 | int error; |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 233 | __be64 *bp; |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame] | 234 | u64 bn; |
| 235 | unsigned n; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 236 | |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame] | 237 | if (height <= ip->i_di.di_height) |
| 238 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 239 | |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame] | 240 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 241 | if (error) |
| 242 | return error; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 243 | |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame] | 244 | for(n = 0; n < new_height; n++) { |
| 245 | bn = gfs2_alloc_meta(ip); |
| 246 | blocks[n] = gfs2_meta_new(ip->i_gl, bn); |
| 247 | gfs2_trans_add_bh(ip->i_gl, blocks[n], 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 248 | } |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 249 | |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame] | 250 | n = 0; |
| 251 | bn = blocks[0]->b_blocknr; |
| 252 | if (new_height > 1) { |
| 253 | for(; n < new_height-1; n++) { |
| 254 | gfs2_metatype_set(blocks[n], GFS2_METATYPE_IN, |
| 255 | GFS2_FORMAT_IN); |
| 256 | gfs2_buffer_clear_tail(blocks[n], |
| 257 | sizeof(struct gfs2_meta_header)); |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 258 | bp = (__be64 *)(blocks[n]->b_data + |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame] | 259 | sizeof(struct gfs2_meta_header)); |
| 260 | *bp = cpu_to_be64(blocks[n+1]->b_blocknr); |
| 261 | brelse(blocks[n]); |
| 262 | blocks[n] = NULL; |
| 263 | } |
| 264 | } |
| 265 | gfs2_metatype_set(blocks[n], GFS2_METATYPE_IN, GFS2_FORMAT_IN); |
| 266 | gfs2_buffer_copy_tail(blocks[n], sizeof(struct gfs2_meta_header), |
| 267 | dibh, sizeof(struct gfs2_dinode)); |
| 268 | brelse(blocks[n]); |
| 269 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 270 | di = (struct gfs2_dinode *)dibh->b_data; |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame] | 271 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 272 | *(__be64 *)(di + 1) = cpu_to_be64(bn); |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame] | 273 | ip->i_di.di_height += new_height; |
| 274 | ip->i_di.di_blocks += new_height; |
Steven Whitehouse | 9e2dbda | 2006-11-08 15:45:46 -0500 | [diff] [blame] | 275 | gfs2_set_inode_blocks(&ip->i_inode); |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 276 | di->di_height = cpu_to_be16(ip->i_di.di_height); |
| 277 | di->di_blocks = cpu_to_be64(ip->i_di.di_blocks); |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame] | 278 | brelse(dibh); |
| 279 | return error; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | /** |
| 283 | * find_metapath - Find path through the metadata tree |
| 284 | * @ip: The inode pointer |
| 285 | * @mp: The metapath to return the result in |
| 286 | * @block: The disk block to look up |
| 287 | * |
| 288 | * This routine returns a struct metapath structure that defines a path |
| 289 | * through the metadata of inode "ip" to get to block "block". |
| 290 | * |
| 291 | * Example: |
| 292 | * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a |
| 293 | * filesystem with a blocksize of 4096. |
| 294 | * |
| 295 | * find_metapath() would return a struct metapath structure set to: |
| 296 | * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48, |
| 297 | * and mp_list[2] = 165. |
| 298 | * |
| 299 | * That means that in order to get to the block containing the byte at |
| 300 | * offset 101342453, we would load the indirect block pointed to by pointer |
| 301 | * 0 in the dinode. We would then load the indirect block pointed to by |
| 302 | * pointer 48 in that indirect block. We would then load the data block |
| 303 | * pointed to by pointer 165 in that indirect block. |
| 304 | * |
| 305 | * ---------------------------------------- |
| 306 | * | Dinode | | |
| 307 | * | | 4| |
| 308 | * | |0 1 2 3 4 5 9| |
| 309 | * | | 6| |
| 310 | * ---------------------------------------- |
| 311 | * | |
| 312 | * | |
| 313 | * V |
| 314 | * ---------------------------------------- |
| 315 | * | Indirect Block | |
| 316 | * | 5| |
| 317 | * | 4 4 4 4 4 5 5 1| |
| 318 | * |0 5 6 7 8 9 0 1 2| |
| 319 | * ---------------------------------------- |
| 320 | * | |
| 321 | * | |
| 322 | * V |
| 323 | * ---------------------------------------- |
| 324 | * | Indirect Block | |
| 325 | * | 1 1 1 1 1 5| |
| 326 | * | 6 6 6 6 6 1| |
| 327 | * |0 3 4 5 6 7 2| |
| 328 | * ---------------------------------------- |
| 329 | * | |
| 330 | * | |
| 331 | * V |
| 332 | * ---------------------------------------- |
| 333 | * | Data block containing offset | |
| 334 | * | 101342453 | |
| 335 | * | | |
| 336 | * | | |
| 337 | * ---------------------------------------- |
| 338 | * |
| 339 | */ |
| 340 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 341 | static void find_metapath(struct gfs2_inode *ip, u64 block, |
Steven Whitehouse | 568f4c9 | 2006-02-27 12:00:42 -0500 | [diff] [blame] | 342 | struct metapath *mp) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 343 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 344 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 345 | u64 b = block; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 346 | unsigned int i; |
| 347 | |
| 348 | for (i = ip->i_di.di_height; i--;) |
Steven Whitehouse | c266871 | 2006-09-04 13:55:48 -0400 | [diff] [blame] | 349 | mp->mp_list[i] = do_div(b, sdp->sd_inptrs); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 350 | |
| 351 | } |
| 352 | |
| 353 | /** |
| 354 | * metapointer - Return pointer to start of metadata in a buffer |
| 355 | * @bh: The buffer |
| 356 | * @height: The metadata height (0 = dinode) |
| 357 | * @mp: The metapath |
| 358 | * |
| 359 | * Return a pointer to the block number of the next height of the metadata |
| 360 | * tree given a buffer containing the pointer to the current height of the |
| 361 | * metadata tree. |
| 362 | */ |
| 363 | |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 364 | static inline __be64 *metapointer(struct buffer_head *bh, int *boundary, |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 365 | unsigned int height, const struct metapath *mp) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 366 | { |
| 367 | unsigned int head_size = (height > 0) ? |
| 368 | sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode); |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 369 | __be64 *ptr; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 370 | *boundary = 0; |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 371 | ptr = ((__be64 *)(bh->b_data + head_size)) + mp->mp_list[height]; |
| 372 | if (ptr + 1 == (__be64 *)(bh->b_data + bh->b_size)) |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 373 | *boundary = 1; |
| 374 | return ptr; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 375 | } |
| 376 | |
| 377 | /** |
| 378 | * lookup_block - Get the next metadata block in metadata tree |
| 379 | * @ip: The GFS2 inode |
| 380 | * @bh: Buffer containing the pointers to metadata blocks |
| 381 | * @height: The height of the tree (0 = dinode) |
| 382 | * @mp: The metapath |
| 383 | * @create: Non-zero if we may create a new meatdata block |
| 384 | * @new: Used to indicate if we did create a new metadata block |
| 385 | * @block: the returned disk block number |
| 386 | * |
| 387 | * Given a metatree, complete to a particular height, checks to see if the next |
| 388 | * height of the tree exists. If not the next height of the tree is created. |
| 389 | * The block number of the next height of the metadata tree is returned. |
| 390 | * |
| 391 | */ |
| 392 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 393 | static int lookup_block(struct gfs2_inode *ip, struct buffer_head *bh, |
| 394 | unsigned int height, struct metapath *mp, int create, |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 395 | int *new, u64 *block) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 396 | { |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 397 | int boundary; |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 398 | __be64 *ptr = metapointer(bh, &boundary, height, mp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 399 | |
| 400 | if (*ptr) { |
| 401 | *block = be64_to_cpu(*ptr); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 402 | return boundary; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 403 | } |
| 404 | |
| 405 | *block = 0; |
| 406 | |
| 407 | if (!create) |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 408 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 409 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 410 | if (height == ip->i_di.di_height - 1 && !gfs2_is_dir(ip)) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 411 | *block = gfs2_alloc_data(ip); |
| 412 | else |
| 413 | *block = gfs2_alloc_meta(ip); |
| 414 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 415 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 416 | |
| 417 | *ptr = cpu_to_be64(*block); |
| 418 | ip->i_di.di_blocks++; |
Steven Whitehouse | 9e2dbda | 2006-11-08 15:45:46 -0500 | [diff] [blame] | 419 | gfs2_set_inode_blocks(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 420 | |
| 421 | *new = 1; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 422 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 423 | } |
| 424 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 425 | static inline void bmap_lock(struct inode *inode, int create) |
| 426 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 427 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 428 | if (create) |
| 429 | down_write(&ip->i_rw_mutex); |
| 430 | else |
| 431 | down_read(&ip->i_rw_mutex); |
| 432 | } |
| 433 | |
| 434 | static inline void bmap_unlock(struct inode *inode, int create) |
| 435 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 436 | struct gfs2_inode *ip = GFS2_I(inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 437 | if (create) |
| 438 | up_write(&ip->i_rw_mutex); |
| 439 | else |
| 440 | up_read(&ip->i_rw_mutex); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 441 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 442 | |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 443 | /** |
| 444 | * gfs2_block_map - Map a block from an inode to a disk block |
| 445 | * @inode: The inode |
| 446 | * @lblock: The logical block number |
| 447 | * @bh_map: The bh to be mapped |
| 448 | * |
| 449 | * Find the block number on the current device which corresponds to an |
| 450 | * inode's block. If the block had to be created, "new" will be set. |
| 451 | * |
| 452 | * Returns: errno |
| 453 | */ |
| 454 | |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 455 | int gfs2_block_map(struct inode *inode, sector_t lblock, |
| 456 | struct buffer_head *bh_map, int create) |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 457 | { |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 458 | struct gfs2_inode *ip = GFS2_I(inode); |
| 459 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 460 | struct buffer_head *bh; |
| 461 | unsigned int bsize; |
| 462 | unsigned int height; |
| 463 | unsigned int end_of_metadata; |
| 464 | unsigned int x; |
| 465 | int error = 0; |
| 466 | int new = 0; |
| 467 | u64 dblock = 0; |
| 468 | int boundary; |
| 469 | unsigned int maxlen = bh_map->b_size >> inode->i_blkbits; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 470 | struct metapath mp; |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 471 | u64 size; |
Bob Peterson | b0d5fd3 | 2007-12-11 19:16:09 -0600 | [diff] [blame] | 472 | struct buffer_head *dibh = NULL; |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 473 | |
| 474 | BUG_ON(maxlen == 0); |
| 475 | |
| 476 | if (gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip))) |
| 477 | return 0; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 478 | |
| 479 | bmap_lock(inode, create); |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 480 | clear_buffer_mapped(bh_map); |
| 481 | clear_buffer_new(bh_map); |
| 482 | clear_buffer_boundary(bh_map); |
| 483 | bsize = gfs2_is_dir(ip) ? sdp->sd_jbsize : sdp->sd_sb.sb_bsize; |
| 484 | size = (lblock + 1) * bsize; |
| 485 | |
| 486 | if (size > ip->i_di.di_size) { |
| 487 | height = calc_tree_height(ip, size); |
| 488 | if (ip->i_di.di_height < height) { |
| 489 | if (!create) |
| 490 | goto out_ok; |
| 491 | |
| 492 | error = build_height(inode, height); |
| 493 | if (error) |
| 494 | goto out_fail; |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | find_metapath(ip, lblock, &mp); |
| 499 | end_of_metadata = ip->i_di.di_height - 1; |
| 500 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 501 | if (error) |
| 502 | goto out_fail; |
Bob Peterson | b0d5fd3 | 2007-12-11 19:16:09 -0600 | [diff] [blame] | 503 | dibh = bh; |
| 504 | get_bh(dibh); |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 505 | |
| 506 | for (x = 0; x < end_of_metadata; x++) { |
| 507 | lookup_block(ip, bh, x, &mp, create, &new, &dblock); |
| 508 | brelse(bh); |
| 509 | if (!dblock) |
| 510 | goto out_ok; |
| 511 | |
| 512 | error = gfs2_meta_indirect_buffer(ip, x+1, dblock, new, &bh); |
| 513 | if (error) |
| 514 | goto out_fail; |
| 515 | } |
| 516 | |
| 517 | boundary = lookup_block(ip, bh, end_of_metadata, &mp, create, &new, &dblock); |
| 518 | if (dblock) { |
| 519 | map_bh(bh_map, inode->i_sb, dblock); |
| 520 | if (boundary) |
| 521 | set_buffer_boundary(bh_map); |
| 522 | if (new) { |
Bob Peterson | b0d5fd3 | 2007-12-11 19:16:09 -0600 | [diff] [blame] | 523 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 524 | gfs2_dinode_out(ip, dibh->b_data); |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 525 | set_buffer_new(bh_map); |
| 526 | goto out_brelse; |
| 527 | } |
| 528 | while(--maxlen && !buffer_boundary(bh_map)) { |
| 529 | u64 eblock; |
| 530 | |
| 531 | mp.mp_list[end_of_metadata]++; |
| 532 | boundary = lookup_block(ip, bh, end_of_metadata, &mp, 0, &new, &eblock); |
| 533 | if (eblock != ++dblock) |
| 534 | break; |
| 535 | bh_map->b_size += (1 << inode->i_blkbits); |
| 536 | if (boundary) |
| 537 | set_buffer_boundary(bh_map); |
| 538 | } |
| 539 | } |
| 540 | out_brelse: |
| 541 | brelse(bh); |
| 542 | out_ok: |
| 543 | error = 0; |
| 544 | out_fail: |
Bob Peterson | b0d5fd3 | 2007-12-11 19:16:09 -0600 | [diff] [blame] | 545 | if (dibh) |
| 546 | brelse(dibh); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 547 | bmap_unlock(inode, create); |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 548 | return error; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 549 | } |
| 550 | |
| 551 | int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen) |
| 552 | { |
Steven Whitehouse | 2359125 | 2006-10-13 17:25:45 -0400 | [diff] [blame] | 553 | struct buffer_head bh = { .b_state = 0, .b_blocknr = 0 }; |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 554 | int ret; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 555 | int create = *new; |
| 556 | |
| 557 | BUG_ON(!extlen); |
| 558 | BUG_ON(!dblock); |
| 559 | BUG_ON(!new); |
| 560 | |
Steven Whitehouse | 2359125 | 2006-10-13 17:25:45 -0400 | [diff] [blame] | 561 | bh.b_size = 1 << (inode->i_blkbits + 5); |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 562 | ret = gfs2_block_map(inode, lblock, &bh, create); |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 563 | *extlen = bh.b_size >> inode->i_blkbits; |
| 564 | *dblock = bh.b_blocknr; |
| 565 | if (buffer_new(&bh)) |
| 566 | *new = 1; |
| 567 | else |
| 568 | *new = 0; |
| 569 | return ret; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 570 | } |
| 571 | |
| 572 | /** |
| 573 | * recursive_scan - recursively scan through the end of a file |
| 574 | * @ip: the inode |
| 575 | * @dibh: the dinode buffer |
| 576 | * @mp: the path through the metadata to the point to start |
| 577 | * @height: the height the recursion is at |
| 578 | * @block: the indirect block to look at |
| 579 | * @first: 1 if this is the first block |
| 580 | * @bc: the call to make for each piece of metadata |
| 581 | * @data: data opaque to this function to pass to @bc |
| 582 | * |
| 583 | * When this is first called @height and @block should be zero and |
| 584 | * @first should be 1. |
| 585 | * |
| 586 | * Returns: errno |
| 587 | */ |
| 588 | |
| 589 | static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh, |
| 590 | struct metapath *mp, unsigned int height, |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 591 | u64 block, int first, block_call_t bc, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 592 | void *data) |
| 593 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 594 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 595 | struct buffer_head *bh = NULL; |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 596 | __be64 *top, *bottom; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 597 | u64 bn; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 598 | int error; |
| 599 | int mh_size = sizeof(struct gfs2_meta_header); |
| 600 | |
| 601 | if (!height) { |
| 602 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 603 | if (error) |
| 604 | return error; |
| 605 | dibh = bh; |
| 606 | |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 607 | top = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0]; |
| 608 | bottom = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + sdp->sd_diptrs; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 609 | } else { |
| 610 | error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh); |
| 611 | if (error) |
| 612 | return error; |
| 613 | |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 614 | top = (__be64 *)(bh->b_data + mh_size) + |
Jan Engelhardt | c5392124 | 2006-09-05 14:30:40 +0200 | [diff] [blame] | 615 | (first ? mp->mp_list[height] : 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 616 | |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 617 | bottom = (__be64 *)(bh->b_data + mh_size) + sdp->sd_inptrs; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 618 | } |
| 619 | |
| 620 | error = bc(ip, dibh, bh, top, bottom, height, data); |
| 621 | if (error) |
| 622 | goto out; |
| 623 | |
| 624 | if (height < ip->i_di.di_height - 1) |
| 625 | for (; top < bottom; top++, first = 0) { |
| 626 | if (!*top) |
| 627 | continue; |
| 628 | |
| 629 | bn = be64_to_cpu(*top); |
| 630 | |
| 631 | error = recursive_scan(ip, dibh, mp, height + 1, bn, |
| 632 | first, bc, data); |
| 633 | if (error) |
| 634 | break; |
| 635 | } |
| 636 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 637 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 638 | brelse(bh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 639 | return error; |
| 640 | } |
| 641 | |
| 642 | /** |
| 643 | * do_strip - Look for a layer a particular layer of the file and strip it off |
| 644 | * @ip: the inode |
| 645 | * @dibh: the dinode buffer |
| 646 | * @bh: A buffer of pointers |
| 647 | * @top: The first pointer in the buffer |
| 648 | * @bottom: One more than the last pointer |
| 649 | * @height: the height this buffer is at |
| 650 | * @data: a pointer to a struct strip_mine |
| 651 | * |
| 652 | * Returns: errno |
| 653 | */ |
| 654 | |
| 655 | static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 656 | struct buffer_head *bh, __be64 *top, __be64 *bottom, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 657 | unsigned int height, void *data) |
| 658 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 659 | struct strip_mine *sm = data; |
| 660 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 661 | struct gfs2_rgrp_list rlist; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 662 | u64 bn, bstart; |
| 663 | u32 blen; |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 664 | __be64 *p; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 665 | unsigned int rg_blocks = 0; |
| 666 | int metadata; |
| 667 | unsigned int revokes = 0; |
| 668 | int x; |
| 669 | int error; |
| 670 | |
| 671 | if (!*top) |
| 672 | sm->sm_first = 0; |
| 673 | |
| 674 | if (height != sm->sm_height) |
| 675 | return 0; |
| 676 | |
| 677 | if (sm->sm_first) { |
| 678 | top++; |
| 679 | sm->sm_first = 0; |
| 680 | } |
| 681 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 682 | metadata = (height != ip->i_di.di_height - 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 683 | if (metadata) |
| 684 | revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs; |
| 685 | |
Steven Whitehouse | 6dbd822 | 2008-01-10 15:18:55 +0000 | [diff] [blame^] | 686 | error = gfs2_rindex_hold(sdp, &ip->i_alloc->al_ri_gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 687 | if (error) |
| 688 | return error; |
| 689 | |
| 690 | memset(&rlist, 0, sizeof(struct gfs2_rgrp_list)); |
| 691 | bstart = 0; |
| 692 | blen = 0; |
| 693 | |
| 694 | for (p = top; p < bottom; p++) { |
| 695 | if (!*p) |
| 696 | continue; |
| 697 | |
| 698 | bn = be64_to_cpu(*p); |
| 699 | |
| 700 | if (bstart + blen == bn) |
| 701 | blen++; |
| 702 | else { |
| 703 | if (bstart) |
| 704 | gfs2_rlist_add(sdp, &rlist, bstart); |
| 705 | |
| 706 | bstart = bn; |
| 707 | blen = 1; |
| 708 | } |
| 709 | } |
| 710 | |
| 711 | if (bstart) |
| 712 | gfs2_rlist_add(sdp, &rlist, bstart); |
| 713 | else |
| 714 | goto out; /* Nothing to do */ |
| 715 | |
| 716 | gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0); |
| 717 | |
| 718 | for (x = 0; x < rlist.rl_rgrps; x++) { |
| 719 | struct gfs2_rgrpd *rgd; |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 720 | rgd = rlist.rl_ghs[x].gh_gl->gl_object; |
Steven Whitehouse | bb8d8a6 | 2007-06-01 14:11:58 +0100 | [diff] [blame] | 721 | rg_blocks += rgd->rd_length; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 722 | } |
| 723 | |
| 724 | error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs); |
| 725 | if (error) |
| 726 | goto out_rlist; |
| 727 | |
| 728 | error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + |
| 729 | RES_INDIRECT + RES_STATFS + RES_QUOTA, |
| 730 | revokes); |
| 731 | if (error) |
| 732 | goto out_rg_gunlock; |
| 733 | |
| 734 | down_write(&ip->i_rw_mutex); |
| 735 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 736 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 737 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 738 | |
| 739 | bstart = 0; |
| 740 | blen = 0; |
| 741 | |
| 742 | for (p = top; p < bottom; p++) { |
| 743 | if (!*p) |
| 744 | continue; |
| 745 | |
| 746 | bn = be64_to_cpu(*p); |
| 747 | |
| 748 | if (bstart + blen == bn) |
| 749 | blen++; |
| 750 | else { |
| 751 | if (bstart) { |
| 752 | if (metadata) |
| 753 | gfs2_free_meta(ip, bstart, blen); |
| 754 | else |
| 755 | gfs2_free_data(ip, bstart, blen); |
| 756 | } |
| 757 | |
| 758 | bstart = bn; |
| 759 | blen = 1; |
| 760 | } |
| 761 | |
| 762 | *p = 0; |
| 763 | if (!ip->i_di.di_blocks) |
| 764 | gfs2_consist_inode(ip); |
| 765 | ip->i_di.di_blocks--; |
Steven Whitehouse | 9e2dbda | 2006-11-08 15:45:46 -0500 | [diff] [blame] | 766 | gfs2_set_inode_blocks(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 767 | } |
| 768 | if (bstart) { |
| 769 | if (metadata) |
| 770 | gfs2_free_meta(ip, bstart, blen); |
| 771 | else |
| 772 | gfs2_free_data(ip, bstart, blen); |
| 773 | } |
| 774 | |
Steven Whitehouse | 4bd91ba | 2007-06-05 09:39:18 +0100 | [diff] [blame] | 775 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 776 | |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 777 | gfs2_dinode_out(ip, dibh->b_data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 778 | |
| 779 | up_write(&ip->i_rw_mutex); |
| 780 | |
| 781 | gfs2_trans_end(sdp); |
| 782 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 783 | out_rg_gunlock: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 784 | gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 785 | out_rlist: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 786 | gfs2_rlist_free(&rlist); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 787 | out: |
Steven Whitehouse | 6dbd822 | 2008-01-10 15:18:55 +0000 | [diff] [blame^] | 788 | gfs2_glock_dq_uninit(&ip->i_alloc->al_ri_gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 789 | return error; |
| 790 | } |
| 791 | |
| 792 | /** |
| 793 | * do_grow - Make a file look bigger than it is |
| 794 | * @ip: the inode |
| 795 | * @size: the size to set the file to |
| 796 | * |
| 797 | * Called with an exclusive lock on @ip. |
| 798 | * |
| 799 | * Returns: errno |
| 800 | */ |
| 801 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 802 | static int do_grow(struct gfs2_inode *ip, u64 size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 803 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 804 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 805 | struct gfs2_alloc *al; |
| 806 | struct buffer_head *dibh; |
| 807 | unsigned int h; |
| 808 | int error; |
| 809 | |
| 810 | al = gfs2_alloc_get(ip); |
| 811 | |
| 812 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
| 813 | if (error) |
| 814 | goto out; |
| 815 | |
Steven Whitehouse | 2933f92 | 2006-11-01 13:23:29 -0500 | [diff] [blame] | 816 | error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 817 | if (error) |
| 818 | goto out_gunlock_q; |
| 819 | |
| 820 | al->al_requested = sdp->sd_max_height + RES_DATA; |
| 821 | |
| 822 | error = gfs2_inplace_reserve(ip); |
| 823 | if (error) |
| 824 | goto out_gunlock_q; |
| 825 | |
| 826 | error = gfs2_trans_begin(sdp, |
Steven Whitehouse | bb8d8a6 | 2007-06-01 14:11:58 +0100 | [diff] [blame] | 827 | sdp->sd_max_height + al->al_rgd->rd_length + |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 828 | RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0); |
| 829 | if (error) |
| 830 | goto out_ipres; |
| 831 | |
| 832 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { |
| 833 | if (gfs2_is_stuffed(ip)) { |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 834 | error = gfs2_unstuff_dinode(ip, NULL); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 835 | if (error) |
| 836 | goto out_end_trans; |
| 837 | } |
| 838 | |
| 839 | h = calc_tree_height(ip, size); |
| 840 | if (ip->i_di.di_height < h) { |
| 841 | down_write(&ip->i_rw_mutex); |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 842 | error = build_height(&ip->i_inode, h); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 843 | up_write(&ip->i_rw_mutex); |
| 844 | if (error) |
| 845 | goto out_end_trans; |
| 846 | } |
| 847 | } |
| 848 | |
| 849 | ip->i_di.di_size = size; |
Steven Whitehouse | 4bd91ba | 2007-06-05 09:39:18 +0100 | [diff] [blame] | 850 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 851 | |
| 852 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 853 | if (error) |
| 854 | goto out_end_trans; |
| 855 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 856 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 857 | gfs2_dinode_out(ip, dibh->b_data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 858 | brelse(dibh); |
| 859 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 860 | out_end_trans: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 861 | gfs2_trans_end(sdp); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 862 | out_ipres: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 863 | gfs2_inplace_release(ip); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 864 | out_gunlock_q: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 865 | gfs2_quota_unlock(ip); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 866 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 867 | gfs2_alloc_put(ip); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 868 | return error; |
| 869 | } |
| 870 | |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 871 | |
| 872 | /** |
| 873 | * gfs2_block_truncate_page - Deal with zeroing out data for truncate |
| 874 | * |
| 875 | * This is partly borrowed from ext3. |
| 876 | */ |
| 877 | static int gfs2_block_truncate_page(struct address_space *mapping) |
| 878 | { |
| 879 | struct inode *inode = mapping->host; |
| 880 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 881 | loff_t from = inode->i_size; |
| 882 | unsigned long index = from >> PAGE_CACHE_SHIFT; |
| 883 | unsigned offset = from & (PAGE_CACHE_SIZE-1); |
| 884 | unsigned blocksize, iblock, length, pos; |
| 885 | struct buffer_head *bh; |
| 886 | struct page *page; |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 887 | int err; |
| 888 | |
| 889 | page = grab_cache_page(mapping, index); |
| 890 | if (!page) |
| 891 | return 0; |
| 892 | |
| 893 | blocksize = inode->i_sb->s_blocksize; |
| 894 | length = blocksize - (offset & (blocksize - 1)); |
| 895 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); |
| 896 | |
| 897 | if (!page_has_buffers(page)) |
| 898 | create_empty_buffers(page, blocksize, 0); |
| 899 | |
| 900 | /* Find the buffer that contains "offset" */ |
| 901 | bh = page_buffers(page); |
| 902 | pos = blocksize; |
| 903 | while (offset >= pos) { |
| 904 | bh = bh->b_this_page; |
| 905 | iblock++; |
| 906 | pos += blocksize; |
| 907 | } |
| 908 | |
| 909 | err = 0; |
| 910 | |
| 911 | if (!buffer_mapped(bh)) { |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 912 | gfs2_block_map(inode, iblock, bh, 0); |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 913 | /* unmapped? It's a hole - nothing to do */ |
| 914 | if (!buffer_mapped(bh)) |
| 915 | goto unlock; |
| 916 | } |
| 917 | |
| 918 | /* Ok, it's mapped. Make sure it's up-to-date */ |
| 919 | if (PageUptodate(page)) |
| 920 | set_buffer_uptodate(bh); |
| 921 | |
| 922 | if (!buffer_uptodate(bh)) { |
| 923 | err = -EIO; |
| 924 | ll_rw_block(READ, 1, &bh); |
| 925 | wait_on_buffer(bh); |
| 926 | /* Uhhuh. Read error. Complain and punt. */ |
| 927 | if (!buffer_uptodate(bh)) |
| 928 | goto unlock; |
S. Wendy Cheng | 1875f2f | 2007-06-25 21:14:31 -0400 | [diff] [blame] | 929 | err = 0; |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 930 | } |
| 931 | |
Steven Whitehouse | bf36a71 | 2007-10-17 08:35:19 +0100 | [diff] [blame] | 932 | if (!gfs2_is_writeback(ip)) |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 933 | gfs2_trans_add_bh(ip->i_gl, bh, 0); |
| 934 | |
Nate Diller | 0507ecf | 2007-05-10 22:41:28 -0700 | [diff] [blame] | 935 | zero_user_page(page, offset, length, KM_USER0); |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 936 | |
| 937 | unlock: |
| 938 | unlock_page(page); |
| 939 | page_cache_release(page); |
| 940 | return err; |
| 941 | } |
| 942 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 943 | static int trunc_start(struct gfs2_inode *ip, u64 size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 944 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 945 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 946 | struct buffer_head *dibh; |
| 947 | int journaled = gfs2_is_jdata(ip); |
| 948 | int error; |
| 949 | |
| 950 | error = gfs2_trans_begin(sdp, |
Jan Engelhardt | c5392124 | 2006-09-05 14:30:40 +0200 | [diff] [blame] | 951 | RES_DINODE + (journaled ? RES_JDATA : 0), 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 952 | if (error) |
| 953 | return error; |
| 954 | |
| 955 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 956 | if (error) |
| 957 | goto out; |
| 958 | |
| 959 | if (gfs2_is_stuffed(ip)) { |
| 960 | ip->i_di.di_size = size; |
Steven Whitehouse | 4bd91ba | 2007-06-05 09:39:18 +0100 | [diff] [blame] | 961 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 962 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 963 | gfs2_dinode_out(ip, dibh->b_data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 964 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size); |
| 965 | error = 1; |
| 966 | |
| 967 | } else { |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 968 | if (size & (u64)(sdp->sd_sb.sb_bsize - 1)) |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 969 | error = gfs2_block_truncate_page(ip->i_inode.i_mapping); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 970 | |
| 971 | if (!error) { |
| 972 | ip->i_di.di_size = size; |
Steven Whitehouse | 4bd91ba | 2007-06-05 09:39:18 +0100 | [diff] [blame] | 973 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 974 | ip->i_di.di_flags |= GFS2_DIF_TRUNC_IN_PROG; |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 975 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 976 | gfs2_dinode_out(ip, dibh->b_data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 977 | } |
| 978 | } |
| 979 | |
| 980 | brelse(dibh); |
| 981 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 982 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 983 | gfs2_trans_end(sdp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 984 | return error; |
| 985 | } |
| 986 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 987 | static int trunc_dealloc(struct gfs2_inode *ip, u64 size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 988 | { |
| 989 | unsigned int height = ip->i_di.di_height; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 990 | u64 lblock; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 991 | struct metapath mp; |
| 992 | int error; |
| 993 | |
| 994 | if (!size) |
| 995 | lblock = 0; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 996 | else |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 997 | lblock = (size - 1) >> GFS2_SB(&ip->i_inode)->sd_sb.sb_bsize_shift; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 998 | |
| 999 | find_metapath(ip, lblock, &mp); |
| 1000 | gfs2_alloc_get(ip); |
| 1001 | |
| 1002 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
| 1003 | if (error) |
| 1004 | goto out; |
| 1005 | |
| 1006 | while (height--) { |
| 1007 | struct strip_mine sm; |
| 1008 | sm.sm_first = !!size; |
| 1009 | sm.sm_height = height; |
| 1010 | |
| 1011 | error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm); |
| 1012 | if (error) |
| 1013 | break; |
| 1014 | } |
| 1015 | |
| 1016 | gfs2_quota_unhold(ip); |
| 1017 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 1018 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1019 | gfs2_alloc_put(ip); |
| 1020 | return error; |
| 1021 | } |
| 1022 | |
| 1023 | static int trunc_end(struct gfs2_inode *ip) |
| 1024 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1025 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1026 | struct buffer_head *dibh; |
| 1027 | int error; |
| 1028 | |
| 1029 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
| 1030 | if (error) |
| 1031 | return error; |
| 1032 | |
| 1033 | down_write(&ip->i_rw_mutex); |
| 1034 | |
| 1035 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 1036 | if (error) |
| 1037 | goto out; |
| 1038 | |
| 1039 | if (!ip->i_di.di_size) { |
| 1040 | ip->i_di.di_height = 0; |
| 1041 | ip->i_di.di_goal_meta = |
| 1042 | ip->i_di.di_goal_data = |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 1043 | ip->i_no_addr; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1044 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
| 1045 | } |
Steven Whitehouse | 4bd91ba | 2007-06-05 09:39:18 +0100 | [diff] [blame] | 1046 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1047 | ip->i_di.di_flags &= ~GFS2_DIF_TRUNC_IN_PROG; |
| 1048 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 1049 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 1050 | gfs2_dinode_out(ip, dibh->b_data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1051 | brelse(dibh); |
| 1052 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 1053 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1054 | up_write(&ip->i_rw_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1055 | gfs2_trans_end(sdp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1056 | return error; |
| 1057 | } |
| 1058 | |
| 1059 | /** |
| 1060 | * do_shrink - make a file smaller |
| 1061 | * @ip: the inode |
| 1062 | * @size: the size to make the file |
| 1063 | * @truncator: function to truncate the last partial block |
| 1064 | * |
| 1065 | * Called with an exclusive lock on @ip. |
| 1066 | * |
| 1067 | * Returns: errno |
| 1068 | */ |
| 1069 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1070 | static int do_shrink(struct gfs2_inode *ip, u64 size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1071 | { |
| 1072 | int error; |
| 1073 | |
Steven Whitehouse | aa6a85a | 2006-01-24 10:37:06 +0000 | [diff] [blame] | 1074 | error = trunc_start(ip, size); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1075 | if (error < 0) |
| 1076 | return error; |
| 1077 | if (error > 0) |
| 1078 | return 0; |
| 1079 | |
| 1080 | error = trunc_dealloc(ip, size); |
| 1081 | if (!error) |
| 1082 | error = trunc_end(ip); |
| 1083 | |
| 1084 | return error; |
| 1085 | } |
| 1086 | |
Wendy Cheng | a13b8c5 | 2007-08-20 09:29:53 -0400 | [diff] [blame] | 1087 | static int do_touch(struct gfs2_inode *ip, u64 size) |
| 1088 | { |
| 1089 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| 1090 | struct buffer_head *dibh; |
| 1091 | int error; |
| 1092 | |
| 1093 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
| 1094 | if (error) |
| 1095 | return error; |
| 1096 | |
| 1097 | down_write(&ip->i_rw_mutex); |
| 1098 | |
| 1099 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 1100 | if (error) |
| 1101 | goto do_touch_out; |
| 1102 | |
| 1103 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
| 1104 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 1105 | gfs2_dinode_out(ip, dibh->b_data); |
| 1106 | brelse(dibh); |
| 1107 | |
| 1108 | do_touch_out: |
| 1109 | up_write(&ip->i_rw_mutex); |
| 1110 | gfs2_trans_end(sdp); |
| 1111 | return error; |
| 1112 | } |
| 1113 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1114 | /** |
Steven Whitehouse | 666a2c5 | 2006-01-18 10:29:04 +0000 | [diff] [blame] | 1115 | * gfs2_truncatei - make a file a given size |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1116 | * @ip: the inode |
| 1117 | * @size: the size to make the file |
| 1118 | * @truncator: function to truncate the last partial block |
| 1119 | * |
| 1120 | * The file size can grow, shrink, or stay the same size. |
| 1121 | * |
| 1122 | * Returns: errno |
| 1123 | */ |
| 1124 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1125 | int gfs2_truncatei(struct gfs2_inode *ip, u64 size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1126 | { |
| 1127 | int error; |
| 1128 | |
Steven Whitehouse | b60623c | 2006-11-01 12:22:46 -0500 | [diff] [blame] | 1129 | if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), S_ISREG(ip->i_inode.i_mode))) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1130 | return -EINVAL; |
| 1131 | |
| 1132 | if (size > ip->i_di.di_size) |
| 1133 | error = do_grow(ip, size); |
Wendy Cheng | a13b8c5 | 2007-08-20 09:29:53 -0400 | [diff] [blame] | 1134 | else if (size < ip->i_di.di_size) |
Steven Whitehouse | aa6a85a | 2006-01-24 10:37:06 +0000 | [diff] [blame] | 1135 | error = do_shrink(ip, size); |
Wendy Cheng | a13b8c5 | 2007-08-20 09:29:53 -0400 | [diff] [blame] | 1136 | else |
| 1137 | /* update time stamps */ |
| 1138 | error = do_touch(ip, size); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1139 | |
| 1140 | return error; |
| 1141 | } |
| 1142 | |
| 1143 | int gfs2_truncatei_resume(struct gfs2_inode *ip) |
| 1144 | { |
| 1145 | int error; |
| 1146 | error = trunc_dealloc(ip, ip->i_di.di_size); |
| 1147 | if (!error) |
| 1148 | error = trunc_end(ip); |
| 1149 | return error; |
| 1150 | } |
| 1151 | |
| 1152 | int gfs2_file_dealloc(struct gfs2_inode *ip) |
| 1153 | { |
| 1154 | return trunc_dealloc(ip, 0); |
| 1155 | } |
| 1156 | |
| 1157 | /** |
| 1158 | * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file |
| 1159 | * @ip: the file |
| 1160 | * @len: the number of bytes to be written to the file |
| 1161 | * @data_blocks: returns the number of data blocks required |
| 1162 | * @ind_blocks: returns the number of indirect blocks required |
| 1163 | * |
| 1164 | */ |
| 1165 | |
| 1166 | void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len, |
| 1167 | unsigned int *data_blocks, unsigned int *ind_blocks) |
| 1168 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1169 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1170 | unsigned int tmp; |
| 1171 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 1172 | if (gfs2_is_dir(ip)) { |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 1173 | *data_blocks = DIV_ROUND_UP(len, sdp->sd_jbsize) + 2; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1174 | *ind_blocks = 3 * (sdp->sd_max_jheight - 1); |
| 1175 | } else { |
| 1176 | *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3; |
| 1177 | *ind_blocks = 3 * (sdp->sd_max_height - 1); |
| 1178 | } |
| 1179 | |
| 1180 | for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) { |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 1181 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1182 | *ind_blocks += tmp; |
| 1183 | } |
| 1184 | } |
| 1185 | |
| 1186 | /** |
| 1187 | * gfs2_write_alloc_required - figure out if a write will require an allocation |
| 1188 | * @ip: the file being written to |
| 1189 | * @offset: the offset to write to |
| 1190 | * @len: the number of bytes being written |
| 1191 | * @alloc_required: set to 1 if an alloc is required, 0 otherwise |
| 1192 | * |
| 1193 | * Returns: errno |
| 1194 | */ |
| 1195 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1196 | int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1197 | unsigned int len, int *alloc_required) |
| 1198 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1199 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1200 | u64 lblock, lblock_stop, dblock; |
| 1201 | u32 extlen; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1202 | int new = 0; |
| 1203 | int error = 0; |
| 1204 | |
| 1205 | *alloc_required = 0; |
| 1206 | |
| 1207 | if (!len) |
| 1208 | return 0; |
| 1209 | |
| 1210 | if (gfs2_is_stuffed(ip)) { |
| 1211 | if (offset + len > |
| 1212 | sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) |
| 1213 | *alloc_required = 1; |
| 1214 | return 0; |
| 1215 | } |
| 1216 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 1217 | if (gfs2_is_dir(ip)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1218 | unsigned int bsize = sdp->sd_jbsize; |
| 1219 | lblock = offset; |
| 1220 | do_div(lblock, bsize); |
| 1221 | lblock_stop = offset + len + bsize - 1; |
| 1222 | do_div(lblock_stop, bsize); |
| 1223 | } else { |
| 1224 | unsigned int shift = sdp->sd_sb.sb_bsize_shift; |
| 1225 | lblock = offset >> shift; |
| 1226 | lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift; |
| 1227 | } |
| 1228 | |
| 1229 | for (; lblock < lblock_stop; lblock += extlen) { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1230 | error = gfs2_extent_map(&ip->i_inode, lblock, &new, &dblock, &extlen); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1231 | if (error) |
| 1232 | return error; |
| 1233 | |
| 1234 | if (!dblock) { |
| 1235 | *alloc_required = 1; |
| 1236 | return 0; |
| 1237 | } |
| 1238 | } |
| 1239 | |
| 1240 | return 0; |
| 1241 | } |
| 1242 | |