David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| 3 | * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. |
| 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 |
| 7 | * of the GNU General Public License v.2. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/sched.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/spinlock.h> |
| 13 | #include <linux/completion.h> |
| 14 | #include <linux/buffer_head.h> |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 15 | #include <linux/gfs2_ondisk.h> |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 16 | #include <linux/crc32.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 17 | #include <asm/semaphore.h> |
| 18 | |
| 19 | #include "gfs2.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 20 | #include "lm_interface.h" |
| 21 | #include "incore.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 22 | #include "bmap.h" |
| 23 | #include "glock.h" |
| 24 | #include "inode.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 25 | #include "meta_io.h" |
| 26 | #include "page.h" |
| 27 | #include "quota.h" |
| 28 | #include "rgrp.h" |
| 29 | #include "trans.h" |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 30 | #include "dir.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 31 | #include "util.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 32 | |
| 33 | /* This doesn't need to be that large as max 64 bit pointers in a 4k |
| 34 | * block is 512, so __u16 is fine for that. It saves stack space to |
| 35 | * keep it small. |
| 36 | */ |
| 37 | struct metapath { |
| 38 | __u16 mp_list[GFS2_MAX_META_HEIGHT]; |
| 39 | }; |
| 40 | |
| 41 | typedef int (*block_call_t) (struct gfs2_inode *ip, struct buffer_head *dibh, |
| 42 | struct buffer_head *bh, uint64_t *top, |
| 43 | uint64_t *bottom, unsigned int height, |
| 44 | void *data); |
| 45 | |
| 46 | struct strip_mine { |
| 47 | int sm_first; |
| 48 | unsigned int sm_height; |
| 49 | }; |
| 50 | |
| 51 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 52 | * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big |
| 53 | * @ip: The GFS2 inode to unstuff |
| 54 | * @unstuffer: the routine that handles unstuffing a non-zero length file |
| 55 | * @private: private data for the unstuffer |
| 56 | * |
| 57 | * This routine unstuffs a dinode and returns it to a "normal" state such |
| 58 | * that the height can be grown in the traditional way. |
| 59 | * |
| 60 | * Returns: errno |
| 61 | */ |
| 62 | |
| 63 | int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer, |
| 64 | void *private) |
| 65 | { |
| 66 | struct buffer_head *bh, *dibh; |
| 67 | uint64_t block = 0; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 68 | int isdir = gfs2_is_dir(ip); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 69 | int error; |
| 70 | |
| 71 | down_write(&ip->i_rw_mutex); |
| 72 | |
| 73 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 74 | if (error) |
| 75 | goto out; |
| 76 | |
| 77 | if (ip->i_di.di_size) { |
| 78 | /* Get a free block, fill it with the stuffed data, |
| 79 | and write it out to disk */ |
| 80 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 81 | if (isdir) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 82 | block = gfs2_alloc_meta(ip); |
| 83 | |
Steven Whitehouse | 61e085a | 2006-04-24 10:07:13 -0400 | [diff] [blame] | 84 | error = gfs2_dir_get_new_buffer(ip, block, &bh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 85 | if (error) |
| 86 | goto out_brelse; |
| 87 | gfs2_buffer_copy_tail(bh, |
| 88 | sizeof(struct gfs2_meta_header), |
| 89 | dibh, sizeof(struct gfs2_dinode)); |
| 90 | brelse(bh); |
| 91 | } else { |
| 92 | block = gfs2_alloc_data(ip); |
| 93 | |
| 94 | error = unstuffer(ip, dibh, block, private); |
| 95 | if (error) |
| 96 | goto out_brelse; |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | /* Set up the pointer to the new block */ |
| 101 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 102 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 103 | |
| 104 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
| 105 | |
| 106 | if (ip->i_di.di_size) { |
Steven Whitehouse | 568f4c9 | 2006-02-27 12:00:42 -0500 | [diff] [blame] | 107 | *(uint64_t *)(dibh->b_data + sizeof(struct gfs2_dinode)) = |
| 108 | cpu_to_be64(block); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 109 | ip->i_di.di_blocks++; |
| 110 | } |
| 111 | |
| 112 | ip->i_di.di_height = 1; |
| 113 | |
| 114 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| 115 | |
| 116 | out_brelse: |
| 117 | brelse(dibh); |
| 118 | |
| 119 | out: |
| 120 | up_write(&ip->i_rw_mutex); |
| 121 | |
| 122 | return error; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * calc_tree_height - Calculate the height of a metadata tree |
| 127 | * @ip: The GFS2 inode |
| 128 | * @size: The proposed size of the file |
| 129 | * |
| 130 | * Work out how tall a metadata tree needs to be in order to accommodate a |
| 131 | * file of a particular size. If size is less than the current size of |
| 132 | * the inode, then the current size of the inode is used instead of the |
| 133 | * supplied one. |
| 134 | * |
| 135 | * Returns: the height the tree should be |
| 136 | */ |
| 137 | |
| 138 | static unsigned int calc_tree_height(struct gfs2_inode *ip, uint64_t size) |
| 139 | { |
| 140 | struct gfs2_sbd *sdp = ip->i_sbd; |
| 141 | uint64_t *arr; |
| 142 | unsigned int max, height; |
| 143 | |
| 144 | if (ip->i_di.di_size > size) |
| 145 | size = ip->i_di.di_size; |
| 146 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 147 | if (gfs2_is_dir(ip)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 148 | arr = sdp->sd_jheightsize; |
| 149 | max = sdp->sd_max_jheight; |
| 150 | } else { |
| 151 | arr = sdp->sd_heightsize; |
| 152 | max = sdp->sd_max_height; |
| 153 | } |
| 154 | |
| 155 | for (height = 0; height < max; height++) |
| 156 | if (arr[height] >= size) |
| 157 | break; |
| 158 | |
| 159 | return height; |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * build_height - Build a metadata tree of the requested height |
| 164 | * @ip: The GFS2 inode |
| 165 | * @height: The height to build to |
| 166 | * |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 167 | * |
| 168 | * Returns: errno |
| 169 | */ |
| 170 | |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame^] | 171 | static int build_height(struct inode *inode, unsigned height) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 172 | { |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame^] | 173 | struct gfs2_inode *ip = inode->u.generic_ip; |
| 174 | unsigned new_height = height - ip->i_di.di_height; |
| 175 | struct buffer_head *dibh; |
| 176 | struct buffer_head *blocks[GFS2_MAX_META_HEIGHT]; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 177 | int error; |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame^] | 178 | u64 *bp; |
| 179 | u64 bn; |
| 180 | unsigned n; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 181 | |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame^] | 182 | if (height <= ip->i_di.di_height) |
| 183 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 184 | |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame^] | 185 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 186 | if (error) |
| 187 | return error; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 188 | |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame^] | 189 | for(n = 0; n < new_height; n++) { |
| 190 | bn = gfs2_alloc_meta(ip); |
| 191 | blocks[n] = gfs2_meta_new(ip->i_gl, bn); |
| 192 | gfs2_trans_add_bh(ip->i_gl, blocks[n], 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 193 | } |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame^] | 194 | |
| 195 | n = 0; |
| 196 | bn = blocks[0]->b_blocknr; |
| 197 | if (new_height > 1) { |
| 198 | for(; n < new_height-1; n++) { |
| 199 | gfs2_metatype_set(blocks[n], GFS2_METATYPE_IN, |
| 200 | GFS2_FORMAT_IN); |
| 201 | gfs2_buffer_clear_tail(blocks[n], |
| 202 | sizeof(struct gfs2_meta_header)); |
| 203 | bp = (u64 *)(blocks[n]->b_data + |
| 204 | sizeof(struct gfs2_meta_header)); |
| 205 | *bp = cpu_to_be64(blocks[n+1]->b_blocknr); |
| 206 | brelse(blocks[n]); |
| 207 | blocks[n] = NULL; |
| 208 | } |
| 209 | } |
| 210 | gfs2_metatype_set(blocks[n], GFS2_METATYPE_IN, GFS2_FORMAT_IN); |
| 211 | gfs2_buffer_copy_tail(blocks[n], sizeof(struct gfs2_meta_header), |
| 212 | dibh, sizeof(struct gfs2_dinode)); |
| 213 | brelse(blocks[n]); |
| 214 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 215 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
| 216 | bp = (u64 *)(dibh->b_data + sizeof(struct gfs2_dinode)); |
| 217 | *bp = cpu_to_be64(bn); |
| 218 | ip->i_di.di_height += new_height; |
| 219 | ip->i_di.di_blocks += new_height; |
| 220 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| 221 | brelse(dibh); |
| 222 | return error; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | /** |
| 226 | * find_metapath - Find path through the metadata tree |
| 227 | * @ip: The inode pointer |
| 228 | * @mp: The metapath to return the result in |
| 229 | * @block: The disk block to look up |
| 230 | * |
| 231 | * This routine returns a struct metapath structure that defines a path |
| 232 | * through the metadata of inode "ip" to get to block "block". |
| 233 | * |
| 234 | * Example: |
| 235 | * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a |
| 236 | * filesystem with a blocksize of 4096. |
| 237 | * |
| 238 | * find_metapath() would return a struct metapath structure set to: |
| 239 | * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48, |
| 240 | * and mp_list[2] = 165. |
| 241 | * |
| 242 | * That means that in order to get to the block containing the byte at |
| 243 | * offset 101342453, we would load the indirect block pointed to by pointer |
| 244 | * 0 in the dinode. We would then load the indirect block pointed to by |
| 245 | * pointer 48 in that indirect block. We would then load the data block |
| 246 | * pointed to by pointer 165 in that indirect block. |
| 247 | * |
| 248 | * ---------------------------------------- |
| 249 | * | Dinode | | |
| 250 | * | | 4| |
| 251 | * | |0 1 2 3 4 5 9| |
| 252 | * | | 6| |
| 253 | * ---------------------------------------- |
| 254 | * | |
| 255 | * | |
| 256 | * V |
| 257 | * ---------------------------------------- |
| 258 | * | Indirect Block | |
| 259 | * | 5| |
| 260 | * | 4 4 4 4 4 5 5 1| |
| 261 | * |0 5 6 7 8 9 0 1 2| |
| 262 | * ---------------------------------------- |
| 263 | * | |
| 264 | * | |
| 265 | * V |
| 266 | * ---------------------------------------- |
| 267 | * | Indirect Block | |
| 268 | * | 1 1 1 1 1 5| |
| 269 | * | 6 6 6 6 6 1| |
| 270 | * |0 3 4 5 6 7 2| |
| 271 | * ---------------------------------------- |
| 272 | * | |
| 273 | * | |
| 274 | * V |
| 275 | * ---------------------------------------- |
| 276 | * | Data block containing offset | |
| 277 | * | 101342453 | |
| 278 | * | | |
| 279 | * | | |
| 280 | * ---------------------------------------- |
| 281 | * |
| 282 | */ |
| 283 | |
Steven Whitehouse | 568f4c9 | 2006-02-27 12:00:42 -0500 | [diff] [blame] | 284 | static void find_metapath(struct gfs2_inode *ip, uint64_t block, |
| 285 | struct metapath *mp) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 286 | { |
| 287 | struct gfs2_sbd *sdp = ip->i_sbd; |
| 288 | uint64_t b = block; |
| 289 | unsigned int i; |
| 290 | |
| 291 | for (i = ip->i_di.di_height; i--;) |
| 292 | mp->mp_list[i] = (__u16)do_div(b, sdp->sd_inptrs); |
| 293 | |
| 294 | } |
| 295 | |
| 296 | /** |
| 297 | * metapointer - Return pointer to start of metadata in a buffer |
| 298 | * @bh: The buffer |
| 299 | * @height: The metadata height (0 = dinode) |
| 300 | * @mp: The metapath |
| 301 | * |
| 302 | * Return a pointer to the block number of the next height of the metadata |
| 303 | * tree given a buffer containing the pointer to the current height of the |
| 304 | * metadata tree. |
| 305 | */ |
| 306 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 307 | static inline u64 *metapointer(struct buffer_head *bh, int *boundary, |
| 308 | unsigned int height, const struct metapath *mp) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 309 | { |
| 310 | unsigned int head_size = (height > 0) ? |
| 311 | sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 312 | u64 *ptr; |
| 313 | *boundary = 0; |
| 314 | ptr = ((u64 *)(bh->b_data + head_size)) + mp->mp_list[height]; |
| 315 | if (ptr + 1 == (u64*)(bh->b_data + bh->b_size)) |
| 316 | *boundary = 1; |
| 317 | return ptr; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | /** |
| 321 | * lookup_block - Get the next metadata block in metadata tree |
| 322 | * @ip: The GFS2 inode |
| 323 | * @bh: Buffer containing the pointers to metadata blocks |
| 324 | * @height: The height of the tree (0 = dinode) |
| 325 | * @mp: The metapath |
| 326 | * @create: Non-zero if we may create a new meatdata block |
| 327 | * @new: Used to indicate if we did create a new metadata block |
| 328 | * @block: the returned disk block number |
| 329 | * |
| 330 | * Given a metatree, complete to a particular height, checks to see if the next |
| 331 | * height of the tree exists. If not the next height of the tree is created. |
| 332 | * The block number of the next height of the metadata tree is returned. |
| 333 | * |
| 334 | */ |
| 335 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 336 | static int lookup_block(struct gfs2_inode *ip, struct buffer_head *bh, |
| 337 | unsigned int height, struct metapath *mp, int create, |
| 338 | int *new, uint64_t *block) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 339 | { |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 340 | int boundary; |
| 341 | uint64_t *ptr = metapointer(bh, &boundary, height, mp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 342 | |
| 343 | if (*ptr) { |
| 344 | *block = be64_to_cpu(*ptr); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 345 | return boundary; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 346 | } |
| 347 | |
| 348 | *block = 0; |
| 349 | |
| 350 | if (!create) |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 351 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 352 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 353 | if (height == ip->i_di.di_height - 1 && !gfs2_is_dir(ip)) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 354 | *block = gfs2_alloc_data(ip); |
| 355 | else |
| 356 | *block = gfs2_alloc_meta(ip); |
| 357 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 358 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 359 | |
| 360 | *ptr = cpu_to_be64(*block); |
| 361 | ip->i_di.di_blocks++; |
| 362 | |
| 363 | *new = 1; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 364 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 365 | } |
| 366 | |
| 367 | /** |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 368 | * gfs2_block_pointers - Map a block from an inode to a disk block |
| 369 | * @inode: The inode |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 370 | * @lblock: The logical block number |
| 371 | * @new: Value/Result argument (1 = may create/did create new blocks) |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 372 | * @boundary: gets set if we've hit a block boundary |
| 373 | * @mp: metapath to use |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 374 | * |
| 375 | * Find the block number on the current device which corresponds to an |
| 376 | * inode's block. If the block had to be created, "new" will be set. |
| 377 | * |
| 378 | * Returns: errno |
| 379 | */ |
| 380 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 381 | static struct buffer_head *gfs2_block_pointers(struct inode *inode, u64 lblock, |
| 382 | int *new, u64 *dblock, |
| 383 | int *boundary, |
| 384 | struct metapath *mp) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 385 | { |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 386 | struct gfs2_inode *ip = inode->u.generic_ip; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 387 | struct gfs2_sbd *sdp = ip->i_sbd; |
| 388 | struct buffer_head *bh; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 389 | int create = *new; |
| 390 | unsigned int bsize; |
| 391 | unsigned int height; |
| 392 | unsigned int end_of_metadata; |
| 393 | unsigned int x; |
| 394 | int error = 0; |
| 395 | |
| 396 | *new = 0; |
| 397 | *dblock = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 398 | |
| 399 | if (gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip))) |
| 400 | goto out; |
| 401 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 402 | bsize = (gfs2_is_dir(ip)) ? sdp->sd_jbsize : sdp->sd_sb.sb_bsize; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 403 | |
| 404 | height = calc_tree_height(ip, (lblock + 1) * bsize); |
| 405 | if (ip->i_di.di_height < height) { |
| 406 | if (!create) |
| 407 | goto out; |
| 408 | |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame^] | 409 | error = build_height(inode, height); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 410 | if (error) |
| 411 | goto out; |
| 412 | } |
| 413 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 414 | find_metapath(ip, lblock, mp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 415 | end_of_metadata = ip->i_di.di_height - 1; |
| 416 | |
| 417 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 418 | if (error) |
| 419 | goto out; |
| 420 | |
| 421 | for (x = 0; x < end_of_metadata; x++) { |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 422 | lookup_block(ip, bh, x, mp, create, new, dblock); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 423 | brelse(bh); |
| 424 | if (!*dblock) |
| 425 | goto out; |
| 426 | |
| 427 | error = gfs2_meta_indirect_buffer(ip, x+1, *dblock, *new, &bh); |
| 428 | if (error) |
| 429 | goto out; |
| 430 | } |
| 431 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 432 | *boundary = lookup_block(ip, bh, end_of_metadata, mp, create, new, dblock); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 433 | if (*new) { |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 434 | struct buffer_head *dibh; |
| 435 | error = gfs2_meta_inode_buffer(ip, &dibh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 436 | if (!error) { |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 437 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 438 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| 439 | brelse(dibh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 440 | } |
| 441 | } |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 442 | return bh; |
| 443 | out: |
| 444 | return ERR_PTR(error); |
| 445 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 446 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 447 | |
| 448 | static inline void bmap_lock(struct inode *inode, int create) |
| 449 | { |
| 450 | struct gfs2_inode *ip = inode->u.generic_ip; |
| 451 | if (create) |
| 452 | down_write(&ip->i_rw_mutex); |
| 453 | else |
| 454 | down_read(&ip->i_rw_mutex); |
| 455 | } |
| 456 | |
| 457 | static inline void bmap_unlock(struct inode *inode, int create) |
| 458 | { |
| 459 | struct gfs2_inode *ip = inode->u.generic_ip; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 460 | if (create) |
| 461 | up_write(&ip->i_rw_mutex); |
| 462 | else |
| 463 | up_read(&ip->i_rw_mutex); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 464 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 465 | |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 466 | int gfs2_block_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, int *boundary) |
| 467 | { |
| 468 | struct metapath mp; |
| 469 | struct buffer_head *bh; |
| 470 | int create = *new; |
| 471 | |
| 472 | bmap_lock(inode, create); |
| 473 | bh = gfs2_block_pointers(inode, lblock, new, dblock, boundary, &mp); |
| 474 | bmap_unlock(inode, create); |
| 475 | if (!bh) |
| 476 | return 0; |
| 477 | if (IS_ERR(bh)) |
| 478 | return PTR_ERR(bh); |
| 479 | brelse(bh); |
| 480 | return 0; |
| 481 | } |
| 482 | |
| 483 | int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen) |
| 484 | { |
| 485 | struct gfs2_inode *ip = inode->u.generic_ip; |
| 486 | struct gfs2_sbd *sdp = ip->i_sbd; |
| 487 | struct metapath mp; |
| 488 | struct buffer_head *bh; |
| 489 | int boundary; |
| 490 | int create = *new; |
| 491 | |
| 492 | BUG_ON(!extlen); |
| 493 | BUG_ON(!dblock); |
| 494 | BUG_ON(!new); |
| 495 | |
| 496 | bmap_lock(inode, create); |
| 497 | bh = gfs2_block_pointers(inode, lblock, new, dblock, &boundary, &mp); |
| 498 | *extlen = 1; |
| 499 | |
| 500 | if (bh && !IS_ERR(bh) && *dblock && !*new) { |
| 501 | u64 tmp_dblock; |
| 502 | int tmp_new; |
| 503 | unsigned int nptrs; |
| 504 | unsigned end_of_metadata = ip->i_di.di_height - 1; |
| 505 | |
| 506 | nptrs = (end_of_metadata) ? sdp->sd_inptrs : sdp->sd_diptrs; |
| 507 | while (++mp.mp_list[end_of_metadata] < nptrs) { |
| 508 | lookup_block(ip, bh, end_of_metadata, &mp, 0, &tmp_new, &tmp_dblock); |
| 509 | if (*dblock + *extlen != tmp_dblock) |
| 510 | break; |
| 511 | (*extlen)++; |
| 512 | } |
| 513 | } |
| 514 | bmap_unlock(inode, create); |
| 515 | if (!bh) |
| 516 | return 0; |
| 517 | if (IS_ERR(bh)) |
| 518 | return PTR_ERR(bh); |
| 519 | brelse(bh); |
| 520 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 521 | } |
| 522 | |
| 523 | /** |
| 524 | * recursive_scan - recursively scan through the end of a file |
| 525 | * @ip: the inode |
| 526 | * @dibh: the dinode buffer |
| 527 | * @mp: the path through the metadata to the point to start |
| 528 | * @height: the height the recursion is at |
| 529 | * @block: the indirect block to look at |
| 530 | * @first: 1 if this is the first block |
| 531 | * @bc: the call to make for each piece of metadata |
| 532 | * @data: data opaque to this function to pass to @bc |
| 533 | * |
| 534 | * When this is first called @height and @block should be zero and |
| 535 | * @first should be 1. |
| 536 | * |
| 537 | * Returns: errno |
| 538 | */ |
| 539 | |
| 540 | static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh, |
| 541 | struct metapath *mp, unsigned int height, |
| 542 | uint64_t block, int first, block_call_t bc, |
| 543 | void *data) |
| 544 | { |
| 545 | struct gfs2_sbd *sdp = ip->i_sbd; |
| 546 | struct buffer_head *bh = NULL; |
| 547 | uint64_t *top, *bottom; |
| 548 | uint64_t bn; |
| 549 | int error; |
| 550 | int mh_size = sizeof(struct gfs2_meta_header); |
| 551 | |
| 552 | if (!height) { |
| 553 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 554 | if (error) |
| 555 | return error; |
| 556 | dibh = bh; |
| 557 | |
| 558 | top = (uint64_t *)(bh->b_data + sizeof(struct gfs2_dinode)) + |
| 559 | mp->mp_list[0]; |
| 560 | bottom = (uint64_t *)(bh->b_data + sizeof(struct gfs2_dinode)) + |
| 561 | sdp->sd_diptrs; |
| 562 | } else { |
| 563 | error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh); |
| 564 | if (error) |
| 565 | return error; |
| 566 | |
| 567 | top = (uint64_t *)(bh->b_data + mh_size) + |
| 568 | ((first) ? mp->mp_list[height] : 0); |
| 569 | |
| 570 | bottom = (uint64_t *)(bh->b_data + mh_size) + sdp->sd_inptrs; |
| 571 | } |
| 572 | |
| 573 | error = bc(ip, dibh, bh, top, bottom, height, data); |
| 574 | if (error) |
| 575 | goto out; |
| 576 | |
| 577 | if (height < ip->i_di.di_height - 1) |
| 578 | for (; top < bottom; top++, first = 0) { |
| 579 | if (!*top) |
| 580 | continue; |
| 581 | |
| 582 | bn = be64_to_cpu(*top); |
| 583 | |
| 584 | error = recursive_scan(ip, dibh, mp, height + 1, bn, |
| 585 | first, bc, data); |
| 586 | if (error) |
| 587 | break; |
| 588 | } |
| 589 | |
| 590 | out: |
| 591 | brelse(bh); |
| 592 | |
| 593 | return error; |
| 594 | } |
| 595 | |
| 596 | /** |
| 597 | * do_strip - Look for a layer a particular layer of the file and strip it off |
| 598 | * @ip: the inode |
| 599 | * @dibh: the dinode buffer |
| 600 | * @bh: A buffer of pointers |
| 601 | * @top: The first pointer in the buffer |
| 602 | * @bottom: One more than the last pointer |
| 603 | * @height: the height this buffer is at |
| 604 | * @data: a pointer to a struct strip_mine |
| 605 | * |
| 606 | * Returns: errno |
| 607 | */ |
| 608 | |
| 609 | static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, |
| 610 | struct buffer_head *bh, uint64_t *top, uint64_t *bottom, |
| 611 | unsigned int height, void *data) |
| 612 | { |
| 613 | struct strip_mine *sm = (struct strip_mine *)data; |
| 614 | struct gfs2_sbd *sdp = ip->i_sbd; |
| 615 | struct gfs2_rgrp_list rlist; |
| 616 | uint64_t bn, bstart; |
| 617 | uint32_t blen; |
| 618 | uint64_t *p; |
| 619 | unsigned int rg_blocks = 0; |
| 620 | int metadata; |
| 621 | unsigned int revokes = 0; |
| 622 | int x; |
| 623 | int error; |
| 624 | |
| 625 | if (!*top) |
| 626 | sm->sm_first = 0; |
| 627 | |
| 628 | if (height != sm->sm_height) |
| 629 | return 0; |
| 630 | |
| 631 | if (sm->sm_first) { |
| 632 | top++; |
| 633 | sm->sm_first = 0; |
| 634 | } |
| 635 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 636 | metadata = (height != ip->i_di.di_height - 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 637 | if (metadata) |
| 638 | revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs; |
| 639 | |
| 640 | error = gfs2_rindex_hold(sdp, &ip->i_alloc.al_ri_gh); |
| 641 | if (error) |
| 642 | return error; |
| 643 | |
| 644 | memset(&rlist, 0, sizeof(struct gfs2_rgrp_list)); |
| 645 | bstart = 0; |
| 646 | blen = 0; |
| 647 | |
| 648 | for (p = top; p < bottom; p++) { |
| 649 | if (!*p) |
| 650 | continue; |
| 651 | |
| 652 | bn = be64_to_cpu(*p); |
| 653 | |
| 654 | if (bstart + blen == bn) |
| 655 | blen++; |
| 656 | else { |
| 657 | if (bstart) |
| 658 | gfs2_rlist_add(sdp, &rlist, bstart); |
| 659 | |
| 660 | bstart = bn; |
| 661 | blen = 1; |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | if (bstart) |
| 666 | gfs2_rlist_add(sdp, &rlist, bstart); |
| 667 | else |
| 668 | goto out; /* Nothing to do */ |
| 669 | |
| 670 | gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0); |
| 671 | |
| 672 | for (x = 0; x < rlist.rl_rgrps; x++) { |
| 673 | struct gfs2_rgrpd *rgd; |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 674 | rgd = rlist.rl_ghs[x].gh_gl->gl_object; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 675 | rg_blocks += rgd->rd_ri.ri_length; |
| 676 | } |
| 677 | |
| 678 | error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs); |
| 679 | if (error) |
| 680 | goto out_rlist; |
| 681 | |
| 682 | error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + |
| 683 | RES_INDIRECT + RES_STATFS + RES_QUOTA, |
| 684 | revokes); |
| 685 | if (error) |
| 686 | goto out_rg_gunlock; |
| 687 | |
| 688 | down_write(&ip->i_rw_mutex); |
| 689 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 690 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 691 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 692 | |
| 693 | bstart = 0; |
| 694 | blen = 0; |
| 695 | |
| 696 | for (p = top; p < bottom; p++) { |
| 697 | if (!*p) |
| 698 | continue; |
| 699 | |
| 700 | bn = be64_to_cpu(*p); |
| 701 | |
| 702 | if (bstart + blen == bn) |
| 703 | blen++; |
| 704 | else { |
| 705 | if (bstart) { |
| 706 | if (metadata) |
| 707 | gfs2_free_meta(ip, bstart, blen); |
| 708 | else |
| 709 | gfs2_free_data(ip, bstart, blen); |
| 710 | } |
| 711 | |
| 712 | bstart = bn; |
| 713 | blen = 1; |
| 714 | } |
| 715 | |
| 716 | *p = 0; |
| 717 | if (!ip->i_di.di_blocks) |
| 718 | gfs2_consist_inode(ip); |
| 719 | ip->i_di.di_blocks--; |
| 720 | } |
| 721 | if (bstart) { |
| 722 | if (metadata) |
| 723 | gfs2_free_meta(ip, bstart, blen); |
| 724 | else |
| 725 | gfs2_free_data(ip, bstart, blen); |
| 726 | } |
| 727 | |
| 728 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); |
| 729 | |
| 730 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| 731 | |
| 732 | up_write(&ip->i_rw_mutex); |
| 733 | |
| 734 | gfs2_trans_end(sdp); |
| 735 | |
| 736 | out_rg_gunlock: |
| 737 | gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs); |
| 738 | |
| 739 | out_rlist: |
| 740 | gfs2_rlist_free(&rlist); |
| 741 | |
| 742 | out: |
| 743 | gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh); |
| 744 | |
| 745 | return error; |
| 746 | } |
| 747 | |
| 748 | /** |
| 749 | * do_grow - Make a file look bigger than it is |
| 750 | * @ip: the inode |
| 751 | * @size: the size to set the file to |
| 752 | * |
| 753 | * Called with an exclusive lock on @ip. |
| 754 | * |
| 755 | * Returns: errno |
| 756 | */ |
| 757 | |
| 758 | static int do_grow(struct gfs2_inode *ip, uint64_t size) |
| 759 | { |
| 760 | struct gfs2_sbd *sdp = ip->i_sbd; |
| 761 | struct gfs2_alloc *al; |
| 762 | struct buffer_head *dibh; |
| 763 | unsigned int h; |
| 764 | int error; |
| 765 | |
| 766 | al = gfs2_alloc_get(ip); |
| 767 | |
| 768 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
| 769 | if (error) |
| 770 | goto out; |
| 771 | |
| 772 | error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid); |
| 773 | if (error) |
| 774 | goto out_gunlock_q; |
| 775 | |
| 776 | al->al_requested = sdp->sd_max_height + RES_DATA; |
| 777 | |
| 778 | error = gfs2_inplace_reserve(ip); |
| 779 | if (error) |
| 780 | goto out_gunlock_q; |
| 781 | |
| 782 | error = gfs2_trans_begin(sdp, |
| 783 | sdp->sd_max_height + al->al_rgd->rd_ri.ri_length + |
| 784 | RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0); |
| 785 | if (error) |
| 786 | goto out_ipres; |
| 787 | |
| 788 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { |
| 789 | if (gfs2_is_stuffed(ip)) { |
| 790 | error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page, |
| 791 | NULL); |
| 792 | if (error) |
| 793 | goto out_end_trans; |
| 794 | } |
| 795 | |
| 796 | h = calc_tree_height(ip, size); |
| 797 | if (ip->i_di.di_height < h) { |
| 798 | down_write(&ip->i_rw_mutex); |
Steven Whitehouse | e90c01e | 2006-05-12 12:09:15 -0400 | [diff] [blame^] | 799 | error = build_height(ip->i_vnode, h); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 800 | up_write(&ip->i_rw_mutex); |
| 801 | if (error) |
| 802 | goto out_end_trans; |
| 803 | } |
| 804 | } |
| 805 | |
| 806 | ip->i_di.di_size = size; |
| 807 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); |
| 808 | |
| 809 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 810 | if (error) |
| 811 | goto out_end_trans; |
| 812 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 813 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 814 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| 815 | brelse(dibh); |
| 816 | |
| 817 | out_end_trans: |
| 818 | gfs2_trans_end(sdp); |
| 819 | |
| 820 | out_ipres: |
| 821 | gfs2_inplace_release(ip); |
| 822 | |
| 823 | out_gunlock_q: |
| 824 | gfs2_quota_unlock(ip); |
| 825 | |
| 826 | out: |
| 827 | gfs2_alloc_put(ip); |
| 828 | |
| 829 | return error; |
| 830 | } |
| 831 | |
Steven Whitehouse | aa6a85a | 2006-01-24 10:37:06 +0000 | [diff] [blame] | 832 | static int trunc_start(struct gfs2_inode *ip, uint64_t size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 833 | { |
| 834 | struct gfs2_sbd *sdp = ip->i_sbd; |
| 835 | struct buffer_head *dibh; |
| 836 | int journaled = gfs2_is_jdata(ip); |
| 837 | int error; |
| 838 | |
| 839 | error = gfs2_trans_begin(sdp, |
| 840 | RES_DINODE + ((journaled) ? RES_JDATA : 0), 0); |
| 841 | if (error) |
| 842 | return error; |
| 843 | |
| 844 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 845 | if (error) |
| 846 | goto out; |
| 847 | |
| 848 | if (gfs2_is_stuffed(ip)) { |
| 849 | ip->i_di.di_size = size; |
| 850 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 851 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 852 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| 853 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size); |
| 854 | error = 1; |
| 855 | |
| 856 | } else { |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 857 | if (size & (uint64_t)(sdp->sd_sb.sb_bsize - 1)) |
Steven Whitehouse | 257f9b4 | 2006-01-31 10:00:25 +0000 | [diff] [blame] | 858 | error = gfs2_block_truncate_page(ip->i_vnode->i_mapping); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 859 | |
| 860 | if (!error) { |
| 861 | ip->i_di.di_size = size; |
| 862 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); |
| 863 | ip->i_di.di_flags |= GFS2_DIF_TRUNC_IN_PROG; |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 864 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 865 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| 866 | } |
| 867 | } |
| 868 | |
| 869 | brelse(dibh); |
| 870 | |
| 871 | out: |
| 872 | gfs2_trans_end(sdp); |
| 873 | |
| 874 | return error; |
| 875 | } |
| 876 | |
| 877 | static int trunc_dealloc(struct gfs2_inode *ip, uint64_t size) |
| 878 | { |
| 879 | unsigned int height = ip->i_di.di_height; |
| 880 | uint64_t lblock; |
| 881 | struct metapath mp; |
| 882 | int error; |
| 883 | |
| 884 | if (!size) |
| 885 | lblock = 0; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 886 | else |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 887 | lblock = (size - 1) >> ip->i_sbd->sd_sb.sb_bsize_shift; |
| 888 | |
| 889 | find_metapath(ip, lblock, &mp); |
| 890 | gfs2_alloc_get(ip); |
| 891 | |
| 892 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
| 893 | if (error) |
| 894 | goto out; |
| 895 | |
| 896 | while (height--) { |
| 897 | struct strip_mine sm; |
| 898 | sm.sm_first = !!size; |
| 899 | sm.sm_height = height; |
| 900 | |
| 901 | error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm); |
| 902 | if (error) |
| 903 | break; |
| 904 | } |
| 905 | |
| 906 | gfs2_quota_unhold(ip); |
| 907 | |
| 908 | out: |
| 909 | gfs2_alloc_put(ip); |
| 910 | return error; |
| 911 | } |
| 912 | |
| 913 | static int trunc_end(struct gfs2_inode *ip) |
| 914 | { |
| 915 | struct gfs2_sbd *sdp = ip->i_sbd; |
| 916 | struct buffer_head *dibh; |
| 917 | int error; |
| 918 | |
| 919 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
| 920 | if (error) |
| 921 | return error; |
| 922 | |
| 923 | down_write(&ip->i_rw_mutex); |
| 924 | |
| 925 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 926 | if (error) |
| 927 | goto out; |
| 928 | |
| 929 | if (!ip->i_di.di_size) { |
| 930 | ip->i_di.di_height = 0; |
| 931 | ip->i_di.di_goal_meta = |
| 932 | ip->i_di.di_goal_data = |
| 933 | ip->i_num.no_addr; |
| 934 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
| 935 | } |
| 936 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); |
| 937 | ip->i_di.di_flags &= ~GFS2_DIF_TRUNC_IN_PROG; |
| 938 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 939 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 940 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| 941 | brelse(dibh); |
| 942 | |
| 943 | out: |
| 944 | up_write(&ip->i_rw_mutex); |
| 945 | |
| 946 | gfs2_trans_end(sdp); |
| 947 | |
| 948 | return error; |
| 949 | } |
| 950 | |
| 951 | /** |
| 952 | * do_shrink - make a file smaller |
| 953 | * @ip: the inode |
| 954 | * @size: the size to make the file |
| 955 | * @truncator: function to truncate the last partial block |
| 956 | * |
| 957 | * Called with an exclusive lock on @ip. |
| 958 | * |
| 959 | * Returns: errno |
| 960 | */ |
| 961 | |
Steven Whitehouse | aa6a85a | 2006-01-24 10:37:06 +0000 | [diff] [blame] | 962 | static int do_shrink(struct gfs2_inode *ip, uint64_t size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 963 | { |
| 964 | int error; |
| 965 | |
Steven Whitehouse | aa6a85a | 2006-01-24 10:37:06 +0000 | [diff] [blame] | 966 | error = trunc_start(ip, size); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 967 | if (error < 0) |
| 968 | return error; |
| 969 | if (error > 0) |
| 970 | return 0; |
| 971 | |
| 972 | error = trunc_dealloc(ip, size); |
| 973 | if (!error) |
| 974 | error = trunc_end(ip); |
| 975 | |
| 976 | return error; |
| 977 | } |
| 978 | |
| 979 | /** |
Steven Whitehouse | 666a2c5 | 2006-01-18 10:29:04 +0000 | [diff] [blame] | 980 | * gfs2_truncatei - make a file a given size |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 981 | * @ip: the inode |
| 982 | * @size: the size to make the file |
| 983 | * @truncator: function to truncate the last partial block |
| 984 | * |
| 985 | * The file size can grow, shrink, or stay the same size. |
| 986 | * |
| 987 | * Returns: errno |
| 988 | */ |
| 989 | |
Steven Whitehouse | aa6a85a | 2006-01-24 10:37:06 +0000 | [diff] [blame] | 990 | int gfs2_truncatei(struct gfs2_inode *ip, uint64_t size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 991 | { |
| 992 | int error; |
| 993 | |
| 994 | if (gfs2_assert_warn(ip->i_sbd, S_ISREG(ip->i_di.di_mode))) |
| 995 | return -EINVAL; |
| 996 | |
| 997 | if (size > ip->i_di.di_size) |
| 998 | error = do_grow(ip, size); |
| 999 | else |
Steven Whitehouse | aa6a85a | 2006-01-24 10:37:06 +0000 | [diff] [blame] | 1000 | error = do_shrink(ip, size); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1001 | |
| 1002 | return error; |
| 1003 | } |
| 1004 | |
| 1005 | int gfs2_truncatei_resume(struct gfs2_inode *ip) |
| 1006 | { |
| 1007 | int error; |
| 1008 | error = trunc_dealloc(ip, ip->i_di.di_size); |
| 1009 | if (!error) |
| 1010 | error = trunc_end(ip); |
| 1011 | return error; |
| 1012 | } |
| 1013 | |
| 1014 | int gfs2_file_dealloc(struct gfs2_inode *ip) |
| 1015 | { |
| 1016 | return trunc_dealloc(ip, 0); |
| 1017 | } |
| 1018 | |
| 1019 | /** |
| 1020 | * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file |
| 1021 | * @ip: the file |
| 1022 | * @len: the number of bytes to be written to the file |
| 1023 | * @data_blocks: returns the number of data blocks required |
| 1024 | * @ind_blocks: returns the number of indirect blocks required |
| 1025 | * |
| 1026 | */ |
| 1027 | |
| 1028 | void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len, |
| 1029 | unsigned int *data_blocks, unsigned int *ind_blocks) |
| 1030 | { |
| 1031 | struct gfs2_sbd *sdp = ip->i_sbd; |
| 1032 | unsigned int tmp; |
| 1033 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 1034 | if (gfs2_is_dir(ip)) { |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 1035 | *data_blocks = DIV_ROUND_UP(len, sdp->sd_jbsize) + 2; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1036 | *ind_blocks = 3 * (sdp->sd_max_jheight - 1); |
| 1037 | } else { |
| 1038 | *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3; |
| 1039 | *ind_blocks = 3 * (sdp->sd_max_height - 1); |
| 1040 | } |
| 1041 | |
| 1042 | for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) { |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 1043 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1044 | *ind_blocks += tmp; |
| 1045 | } |
| 1046 | } |
| 1047 | |
| 1048 | /** |
| 1049 | * gfs2_write_alloc_required - figure out if a write will require an allocation |
| 1050 | * @ip: the file being written to |
| 1051 | * @offset: the offset to write to |
| 1052 | * @len: the number of bytes being written |
| 1053 | * @alloc_required: set to 1 if an alloc is required, 0 otherwise |
| 1054 | * |
| 1055 | * Returns: errno |
| 1056 | */ |
| 1057 | |
| 1058 | int gfs2_write_alloc_required(struct gfs2_inode *ip, uint64_t offset, |
| 1059 | unsigned int len, int *alloc_required) |
| 1060 | { |
| 1061 | struct gfs2_sbd *sdp = ip->i_sbd; |
| 1062 | uint64_t lblock, lblock_stop, dblock; |
| 1063 | uint32_t extlen; |
| 1064 | int new = 0; |
| 1065 | int error = 0; |
| 1066 | |
| 1067 | *alloc_required = 0; |
| 1068 | |
| 1069 | if (!len) |
| 1070 | return 0; |
| 1071 | |
| 1072 | if (gfs2_is_stuffed(ip)) { |
| 1073 | if (offset + len > |
| 1074 | sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) |
| 1075 | *alloc_required = 1; |
| 1076 | return 0; |
| 1077 | } |
| 1078 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 1079 | if (gfs2_is_dir(ip)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1080 | unsigned int bsize = sdp->sd_jbsize; |
| 1081 | lblock = offset; |
| 1082 | do_div(lblock, bsize); |
| 1083 | lblock_stop = offset + len + bsize - 1; |
| 1084 | do_div(lblock_stop, bsize); |
| 1085 | } else { |
| 1086 | unsigned int shift = sdp->sd_sb.sb_bsize_shift; |
| 1087 | lblock = offset >> shift; |
| 1088 | lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift; |
| 1089 | } |
| 1090 | |
| 1091 | for (; lblock < lblock_stop; lblock += extlen) { |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 1092 | error = gfs2_extent_map(ip->i_vnode, lblock, &new, &dblock, &extlen); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1093 | if (error) |
| 1094 | return error; |
| 1095 | |
| 1096 | if (!dblock) { |
| 1097 | *alloc_required = 1; |
| 1098 | return 0; |
| 1099 | } |
| 1100 | } |
| 1101 | |
| 1102 | return 0; |
| 1103 | } |
| 1104 | |