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 { |
Steven Whitehouse | dbac671 | 2008-01-29 09:12:55 +0000 | [diff] [blame] | 36 | struct buffer_head *mp_bh[GFS2_MAX_META_HEIGHT]; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 37 | __u16 mp_list[GFS2_MAX_META_HEIGHT]; |
| 38 | }; |
| 39 | |
| 40 | 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] | 41 | struct buffer_head *bh, __be64 *top, |
| 42 | __be64 *bottom, unsigned int height, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 43 | void *data); |
| 44 | |
| 45 | struct strip_mine { |
| 46 | int sm_first; |
| 47 | unsigned int sm_height; |
| 48 | }; |
| 49 | |
| 50 | /** |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 51 | * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page |
| 52 | * @ip: the inode |
| 53 | * @dibh: the dinode buffer |
| 54 | * @block: the block number that was allocated |
| 55 | * @private: any locked page held by the caller process |
| 56 | * |
| 57 | * Returns: errno |
| 58 | */ |
| 59 | |
| 60 | 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] | 61 | u64 block, struct page *page) |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 62 | { |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 63 | struct inode *inode = &ip->i_inode; |
| 64 | struct buffer_head *bh; |
| 65 | int release = 0; |
| 66 | |
| 67 | if (!page || page->index) { |
| 68 | page = grab_cache_page(inode->i_mapping, 0); |
| 69 | if (!page) |
| 70 | return -ENOMEM; |
| 71 | release = 1; |
| 72 | } |
| 73 | |
| 74 | if (!PageUptodate(page)) { |
| 75 | void *kaddr = kmap(page); |
| 76 | |
| 77 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), |
| 78 | ip->i_di.di_size); |
| 79 | memset(kaddr + ip->i_di.di_size, 0, |
| 80 | PAGE_CACHE_SIZE - ip->i_di.di_size); |
| 81 | kunmap(page); |
| 82 | |
| 83 | SetPageUptodate(page); |
| 84 | } |
| 85 | |
| 86 | if (!page_has_buffers(page)) |
| 87 | create_empty_buffers(page, 1 << inode->i_blkbits, |
| 88 | (1 << BH_Uptodate)); |
| 89 | |
| 90 | bh = page_buffers(page); |
| 91 | |
| 92 | if (!buffer_mapped(bh)) |
| 93 | map_bh(bh, inode->i_sb, block); |
| 94 | |
| 95 | set_buffer_uptodate(bh); |
Steven Whitehouse | eaf9652 | 2007-08-27 09:49:37 +0100 | [diff] [blame] | 96 | if (!gfs2_is_jdata(ip)) |
| 97 | mark_buffer_dirty(bh); |
Steven Whitehouse | bf36a71 | 2007-10-17 08:35:19 +0100 | [diff] [blame] | 98 | if (!gfs2_is_writeback(ip)) |
Bob Peterson | 8475487 | 2007-09-02 10:55:29 +0100 | [diff] [blame] | 99 | gfs2_trans_add_bh(ip->i_gl, bh, 0); |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 100 | |
| 101 | if (release) { |
| 102 | unlock_page(page); |
| 103 | page_cache_release(page); |
| 104 | } |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 110 | * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big |
| 111 | * @ip: The GFS2 inode to unstuff |
| 112 | * @unstuffer: the routine that handles unstuffing a non-zero length file |
| 113 | * @private: private data for the unstuffer |
| 114 | * |
| 115 | * This routine unstuffs a dinode and returns it to a "normal" state such |
| 116 | * that the height can be grown in the traditional way. |
| 117 | * |
| 118 | * Returns: errno |
| 119 | */ |
| 120 | |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 121 | int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 122 | { |
| 123 | struct buffer_head *bh, *dibh; |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 124 | struct gfs2_dinode *di; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 125 | u64 block = 0; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 126 | int isdir = gfs2_is_dir(ip); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 127 | int error; |
| 128 | |
| 129 | down_write(&ip->i_rw_mutex); |
| 130 | |
| 131 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 132 | if (error) |
| 133 | goto out; |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 134 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 135 | if (ip->i_di.di_size) { |
| 136 | /* Get a free block, fill it with the stuffed data, |
| 137 | and write it out to disk */ |
| 138 | |
Steven Whitehouse | b45e41d | 2008-02-06 10:11:15 +0000 | [diff] [blame] | 139 | unsigned int n = 1; |
| 140 | block = gfs2_alloc_block(ip, &n); |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 141 | if (isdir) { |
Steven Whitehouse | 5731be5 | 2008-02-01 13:16:55 +0000 | [diff] [blame] | 142 | gfs2_trans_add_unrevoke(GFS2_SB(&ip->i_inode), block, 1); |
Steven Whitehouse | 61e085a | 2006-04-24 10:07:13 -0400 | [diff] [blame] | 143 | error = gfs2_dir_get_new_buffer(ip, block, &bh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 144 | if (error) |
| 145 | goto out_brelse; |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 146 | gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_meta_header), |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 147 | dibh, sizeof(struct gfs2_dinode)); |
| 148 | brelse(bh); |
| 149 | } else { |
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); |
Steven Whitehouse | 77658aa | 2008-02-12 14:17:27 +0000 | [diff] [blame] | 164 | gfs2_add_inode_blocks(&ip->i_inode, 1); |
| 165 | di->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 166 | } |
| 167 | |
Steven Whitehouse | ecc30c7 | 2008-01-28 10:37:35 +0000 | [diff] [blame] | 168 | ip->i_height = 1; |
Steven Whitehouse | 48516ce | 2006-10-02 12:39:19 -0400 | [diff] [blame] | 169 | di->di_height = cpu_to_be16(1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 170 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 171 | out_brelse: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 172 | brelse(dibh); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 173 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 174 | up_write(&ip->i_rw_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 175 | return error; |
| 176 | } |
| 177 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 178 | |
| 179 | /** |
| 180 | * find_metapath - Find path through the metadata tree |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 181 | * @sdp: The superblock |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 182 | * @mp: The metapath to return the result in |
| 183 | * @block: The disk block to look up |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 184 | * @height: The pre-calculated height of the metadata tree |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 185 | * |
| 186 | * This routine returns a struct metapath structure that defines a path |
| 187 | * through the metadata of inode "ip" to get to block "block". |
| 188 | * |
| 189 | * Example: |
| 190 | * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a |
| 191 | * filesystem with a blocksize of 4096. |
| 192 | * |
| 193 | * find_metapath() would return a struct metapath structure set to: |
| 194 | * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48, |
| 195 | * and mp_list[2] = 165. |
| 196 | * |
| 197 | * That means that in order to get to the block containing the byte at |
| 198 | * offset 101342453, we would load the indirect block pointed to by pointer |
| 199 | * 0 in the dinode. We would then load the indirect block pointed to by |
| 200 | * pointer 48 in that indirect block. We would then load the data block |
| 201 | * pointed to by pointer 165 in that indirect block. |
| 202 | * |
| 203 | * ---------------------------------------- |
| 204 | * | Dinode | | |
| 205 | * | | 4| |
| 206 | * | |0 1 2 3 4 5 9| |
| 207 | * | | 6| |
| 208 | * ---------------------------------------- |
| 209 | * | |
| 210 | * | |
| 211 | * V |
| 212 | * ---------------------------------------- |
| 213 | * | Indirect Block | |
| 214 | * | 5| |
| 215 | * | 4 4 4 4 4 5 5 1| |
| 216 | * |0 5 6 7 8 9 0 1 2| |
| 217 | * ---------------------------------------- |
| 218 | * | |
| 219 | * | |
| 220 | * V |
| 221 | * ---------------------------------------- |
| 222 | * | Indirect Block | |
| 223 | * | 1 1 1 1 1 5| |
| 224 | * | 6 6 6 6 6 1| |
| 225 | * |0 3 4 5 6 7 2| |
| 226 | * ---------------------------------------- |
| 227 | * | |
| 228 | * | |
| 229 | * V |
| 230 | * ---------------------------------------- |
| 231 | * | Data block containing offset | |
| 232 | * | 101342453 | |
| 233 | * | | |
| 234 | * | | |
| 235 | * ---------------------------------------- |
| 236 | * |
| 237 | */ |
| 238 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 239 | static void find_metapath(const struct gfs2_sbd *sdp, u64 block, |
| 240 | struct metapath *mp, unsigned int height) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 241 | { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 242 | unsigned int i; |
| 243 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 244 | for (i = height; i--;) |
Bob Peterson | 7eabb77 | 2008-01-28 11:24:35 -0600 | [diff] [blame] | 245 | mp->mp_list[i] = do_div(block, sdp->sd_inptrs); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 246 | |
| 247 | } |
| 248 | |
Benjamin Marzinski | 5af4e7a | 2008-06-24 12:53:38 -0500 | [diff] [blame] | 249 | static inline unsigned int metapath_branch_start(const struct metapath *mp) |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 250 | { |
Benjamin Marzinski | 5af4e7a | 2008-06-24 12:53:38 -0500 | [diff] [blame] | 251 | if (mp->mp_list[0] == 0) |
| 252 | return 2; |
| 253 | return 1; |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 254 | } |
| 255 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 256 | /** |
| 257 | * metapointer - Return pointer to start of metadata in a buffer |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 258 | * @height: The metadata height (0 = dinode) |
| 259 | * @mp: The metapath |
| 260 | * |
| 261 | * Return a pointer to the block number of the next height of the metadata |
| 262 | * tree given a buffer containing the pointer to the current height of the |
| 263 | * metadata tree. |
| 264 | */ |
| 265 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 266 | static inline __be64 *metapointer(unsigned int height, const struct metapath *mp) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 267 | { |
Steven Whitehouse | dbac671 | 2008-01-29 09:12:55 +0000 | [diff] [blame] | 268 | struct buffer_head *bh = mp->mp_bh[height]; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 269 | unsigned int head_size = (height > 0) ? |
| 270 | sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode); |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 271 | return ((__be64 *)(bh->b_data + head_size)) + mp->mp_list[height]; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | /** |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 275 | * lookup_metapath - Walk the metadata tree to a specific point |
| 276 | * @ip: The inode |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 277 | * @mp: The metapath |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 278 | * |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 279 | * Assumes that the inode's buffer has already been looked up and |
| 280 | * hooked onto mp->mp_bh[0] and that the metapath has been initialised |
| 281 | * by find_metapath(). |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 282 | * |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 283 | * If this function encounters part of the tree which has not been |
| 284 | * allocated, it returns the current height of the tree at the point |
| 285 | * at which it found the unallocated block. Blocks which are found are |
| 286 | * added to the mp->mp_bh[] list. |
| 287 | * |
| 288 | * Returns: error or height of metadata tree |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 289 | */ |
| 290 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 291 | static int lookup_metapath(struct gfs2_inode *ip, struct metapath *mp) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 292 | { |
Steven Whitehouse | 11707ea | 2008-01-28 15:10:29 +0000 | [diff] [blame] | 293 | unsigned int end_of_metadata = ip->i_height - 1; |
| 294 | unsigned int x; |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 295 | __be64 *ptr; |
| 296 | u64 dblock; |
Steven Whitehouse | e23159d | 2008-02-12 14:48:39 +0000 | [diff] [blame] | 297 | int ret; |
Steven Whitehouse | 11707ea | 2008-01-28 15:10:29 +0000 | [diff] [blame] | 298 | |
| 299 | for (x = 0; x < end_of_metadata; x++) { |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 300 | ptr = metapointer(x, mp); |
| 301 | dblock = be64_to_cpu(*ptr); |
| 302 | if (!dblock) |
| 303 | return x + 1; |
Steven Whitehouse | 11707ea | 2008-01-28 15:10:29 +0000 | [diff] [blame] | 304 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 305 | ret = gfs2_meta_indirect_buffer(ip, x+1, dblock, 0, &mp->mp_bh[x+1]); |
Steven Whitehouse | 11707ea | 2008-01-28 15:10:29 +0000 | [diff] [blame] | 306 | if (ret) |
| 307 | return ret; |
| 308 | } |
| 309 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 310 | return ip->i_height; |
Steven Whitehouse | dbac671 | 2008-01-29 09:12:55 +0000 | [diff] [blame] | 311 | } |
| 312 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 313 | static inline void release_metapath(struct metapath *mp) |
Steven Whitehouse | dbac671 | 2008-01-29 09:12:55 +0000 | [diff] [blame] | 314 | { |
| 315 | int i; |
| 316 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 317 | for (i = 0; i < GFS2_MAX_META_HEIGHT; i++) { |
| 318 | if (mp->mp_bh[i] == NULL) |
| 319 | break; |
| 320 | brelse(mp->mp_bh[i]); |
| 321 | } |
Steven Whitehouse | 11707ea | 2008-01-28 15:10:29 +0000 | [diff] [blame] | 322 | } |
| 323 | |
Steven Whitehouse | 30cbf18 | 2008-02-08 13:18:11 +0000 | [diff] [blame] | 324 | /** |
| 325 | * gfs2_extent_length - Returns length of an extent of blocks |
| 326 | * @start: Start of the buffer |
| 327 | * @len: Length of the buffer in bytes |
| 328 | * @ptr: Current position in the buffer |
| 329 | * @limit: Max extent length to return (0 = unlimited) |
| 330 | * @eob: Set to 1 if we hit "end of block" |
| 331 | * |
| 332 | * If the first block is zero (unallocated) it will return the number of |
| 333 | * unallocated blocks in the extent, otherwise it will return the number |
| 334 | * of contiguous blocks in the extent. |
| 335 | * |
| 336 | * Returns: The length of the extent (minimum of one block) |
| 337 | */ |
| 338 | |
| 339 | static inline unsigned int gfs2_extent_length(void *start, unsigned int len, __be64 *ptr, unsigned limit, int *eob) |
| 340 | { |
| 341 | const __be64 *end = (start + len); |
| 342 | const __be64 *first = ptr; |
| 343 | u64 d = be64_to_cpu(*ptr); |
| 344 | |
| 345 | *eob = 0; |
| 346 | do { |
| 347 | ptr++; |
| 348 | if (ptr >= end) |
| 349 | break; |
| 350 | if (limit && --limit == 0) |
| 351 | break; |
| 352 | if (d) |
| 353 | d++; |
| 354 | } while(be64_to_cpu(*ptr) == d); |
| 355 | if (ptr >= end) |
| 356 | *eob = 1; |
| 357 | return (ptr - first); |
| 358 | } |
| 359 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 360 | static inline void bmap_lock(struct gfs2_inode *ip, int create) |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 361 | { |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 362 | if (create) |
| 363 | down_write(&ip->i_rw_mutex); |
| 364 | else |
| 365 | down_read(&ip->i_rw_mutex); |
| 366 | } |
| 367 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 368 | static inline void bmap_unlock(struct gfs2_inode *ip, int create) |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 369 | { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 370 | if (create) |
| 371 | up_write(&ip->i_rw_mutex); |
| 372 | else |
| 373 | up_read(&ip->i_rw_mutex); |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 374 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 375 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 376 | static inline __be64 *gfs2_indirect_init(struct metapath *mp, |
| 377 | struct gfs2_glock *gl, unsigned int i, |
| 378 | unsigned offset, u64 bn) |
| 379 | { |
| 380 | __be64 *ptr = (__be64 *)(mp->mp_bh[i - 1]->b_data + |
| 381 | ((i > 1) ? sizeof(struct gfs2_meta_header) : |
| 382 | sizeof(struct gfs2_dinode))); |
| 383 | BUG_ON(i < 1); |
| 384 | BUG_ON(mp->mp_bh[i] != NULL); |
| 385 | mp->mp_bh[i] = gfs2_meta_new(gl, bn); |
| 386 | gfs2_trans_add_bh(gl, mp->mp_bh[i], 1); |
| 387 | gfs2_metatype_set(mp->mp_bh[i], GFS2_METATYPE_IN, GFS2_FORMAT_IN); |
| 388 | gfs2_buffer_clear_tail(mp->mp_bh[i], sizeof(struct gfs2_meta_header)); |
| 389 | ptr += offset; |
| 390 | *ptr = cpu_to_be64(bn); |
| 391 | return ptr; |
| 392 | } |
| 393 | |
| 394 | enum alloc_state { |
| 395 | ALLOC_DATA = 0, |
| 396 | ALLOC_GROW_DEPTH = 1, |
| 397 | ALLOC_GROW_HEIGHT = 2, |
| 398 | /* ALLOC_UNSTUFF = 3, TBD and rather complicated */ |
| 399 | }; |
| 400 | |
| 401 | /** |
| 402 | * gfs2_bmap_alloc - Build a metadata tree of the requested height |
| 403 | * @inode: The GFS2 inode |
| 404 | * @lblock: The logical starting block of the extent |
| 405 | * @bh_map: This is used to return the mapping details |
| 406 | * @mp: The metapath |
| 407 | * @sheight: The starting height (i.e. whats already mapped) |
| 408 | * @height: The height to build to |
| 409 | * @maxlen: The max number of data blocks to alloc |
| 410 | * |
| 411 | * In this routine we may have to alloc: |
| 412 | * i) Indirect blocks to grow the metadata tree height |
| 413 | * ii) Indirect blocks to fill in lower part of the metadata tree |
| 414 | * iii) Data blocks |
| 415 | * |
| 416 | * The function is in two parts. The first part works out the total |
| 417 | * number of blocks which we need. The second part does the actual |
| 418 | * allocation asking for an extent at a time (if enough contiguous free |
| 419 | * blocks are available, there will only be one request per bmap call) |
| 420 | * and uses the state machine to initialise the blocks in order. |
| 421 | * |
| 422 | * Returns: errno on error |
| 423 | */ |
| 424 | |
| 425 | static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock, |
| 426 | struct buffer_head *bh_map, struct metapath *mp, |
| 427 | const unsigned int sheight, |
| 428 | const unsigned int height, |
| 429 | const unsigned int maxlen) |
| 430 | { |
| 431 | struct gfs2_inode *ip = GFS2_I(inode); |
| 432 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 433 | struct buffer_head *dibh = mp->mp_bh[0]; |
| 434 | u64 bn, dblock = 0; |
Benjamin Marzinski | 5af4e7a | 2008-06-24 12:53:38 -0500 | [diff] [blame] | 435 | unsigned n, i, blks, alloced = 0, iblks = 0, branch_start = 0; |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 436 | unsigned dblks = 0; |
| 437 | unsigned ptrs_per_blk; |
| 438 | const unsigned end_of_metadata = height - 1; |
| 439 | int eob = 0; |
| 440 | enum alloc_state state; |
| 441 | __be64 *ptr; |
| 442 | __be64 zero_bn = 0; |
| 443 | |
| 444 | BUG_ON(sheight < 1); |
| 445 | BUG_ON(dibh == NULL); |
| 446 | |
| 447 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 448 | |
| 449 | if (height == sheight) { |
| 450 | struct buffer_head *bh; |
| 451 | /* Bottom indirect block exists, find unalloced extent size */ |
| 452 | ptr = metapointer(end_of_metadata, mp); |
| 453 | bh = mp->mp_bh[end_of_metadata]; |
| 454 | dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen, |
| 455 | &eob); |
| 456 | BUG_ON(dblks < 1); |
| 457 | state = ALLOC_DATA; |
| 458 | } else { |
| 459 | /* Need to allocate indirect blocks */ |
| 460 | ptrs_per_blk = height > 1 ? sdp->sd_inptrs : sdp->sd_diptrs; |
| 461 | dblks = min(maxlen, ptrs_per_blk - mp->mp_list[end_of_metadata]); |
| 462 | if (height == ip->i_height) { |
| 463 | /* Writing into existing tree, extend tree down */ |
| 464 | iblks = height - sheight; |
| 465 | state = ALLOC_GROW_DEPTH; |
| 466 | } else { |
| 467 | /* Building up tree height */ |
| 468 | state = ALLOC_GROW_HEIGHT; |
| 469 | iblks = height - ip->i_height; |
Benjamin Marzinski | 5af4e7a | 2008-06-24 12:53:38 -0500 | [diff] [blame] | 470 | branch_start = metapath_branch_start(mp); |
| 471 | iblks += (height - branch_start); |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 472 | } |
| 473 | } |
| 474 | |
| 475 | /* start of the second part of the function (state machine) */ |
| 476 | |
| 477 | blks = dblks + iblks; |
| 478 | i = sheight; |
| 479 | do { |
| 480 | n = blks - alloced; |
| 481 | bn = gfs2_alloc_block(ip, &n); |
| 482 | alloced += n; |
| 483 | if (state != ALLOC_DATA || gfs2_is_jdata(ip)) |
| 484 | gfs2_trans_add_unrevoke(sdp, bn, n); |
| 485 | switch (state) { |
| 486 | /* Growing height of tree */ |
| 487 | case ALLOC_GROW_HEIGHT: |
| 488 | if (i == 1) { |
| 489 | ptr = (__be64 *)(dibh->b_data + |
| 490 | sizeof(struct gfs2_dinode)); |
| 491 | zero_bn = *ptr; |
| 492 | } |
| 493 | for (; i - 1 < height - ip->i_height && n > 0; i++, n--) |
| 494 | gfs2_indirect_init(mp, ip->i_gl, i, 0, bn++); |
| 495 | if (i - 1 == height - ip->i_height) { |
| 496 | i--; |
| 497 | gfs2_buffer_copy_tail(mp->mp_bh[i], |
| 498 | sizeof(struct gfs2_meta_header), |
| 499 | dibh, sizeof(struct gfs2_dinode)); |
| 500 | gfs2_buffer_clear_tail(dibh, |
| 501 | sizeof(struct gfs2_dinode) + |
| 502 | sizeof(__be64)); |
| 503 | ptr = (__be64 *)(mp->mp_bh[i]->b_data + |
| 504 | sizeof(struct gfs2_meta_header)); |
| 505 | *ptr = zero_bn; |
| 506 | state = ALLOC_GROW_DEPTH; |
Benjamin Marzinski | 5af4e7a | 2008-06-24 12:53:38 -0500 | [diff] [blame] | 507 | for(i = branch_start; i < height; i++) { |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 508 | if (mp->mp_bh[i] == NULL) |
| 509 | break; |
| 510 | brelse(mp->mp_bh[i]); |
| 511 | mp->mp_bh[i] = NULL; |
| 512 | } |
Benjamin Marzinski | 5af4e7a | 2008-06-24 12:53:38 -0500 | [diff] [blame] | 513 | i = branch_start; |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 514 | } |
| 515 | if (n == 0) |
| 516 | break; |
| 517 | /* Branching from existing tree */ |
| 518 | case ALLOC_GROW_DEPTH: |
| 519 | if (i > 1 && i < height) |
| 520 | gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[i-1], 1); |
| 521 | for (; i < height && n > 0; i++, n--) |
| 522 | gfs2_indirect_init(mp, ip->i_gl, i, |
| 523 | mp->mp_list[i-1], bn++); |
| 524 | if (i == height) |
| 525 | state = ALLOC_DATA; |
| 526 | if (n == 0) |
| 527 | break; |
| 528 | /* Tree complete, adding data blocks */ |
| 529 | case ALLOC_DATA: |
| 530 | BUG_ON(n > dblks); |
| 531 | BUG_ON(mp->mp_bh[end_of_metadata] == NULL); |
| 532 | gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[end_of_metadata], 1); |
| 533 | dblks = n; |
| 534 | ptr = metapointer(end_of_metadata, mp); |
| 535 | dblock = bn; |
| 536 | while (n-- > 0) |
| 537 | *ptr++ = cpu_to_be64(bn++); |
| 538 | break; |
| 539 | } |
| 540 | } while (state != ALLOC_DATA); |
| 541 | |
| 542 | ip->i_height = height; |
| 543 | gfs2_add_inode_blocks(&ip->i_inode, alloced); |
| 544 | gfs2_dinode_out(ip, mp->mp_bh[0]->b_data); |
| 545 | map_bh(bh_map, inode->i_sb, dblock); |
| 546 | bh_map->b_size = dblks << inode->i_blkbits; |
| 547 | set_buffer_new(bh_map); |
| 548 | return 0; |
| 549 | } |
| 550 | |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 551 | /** |
| 552 | * gfs2_block_map - Map a block from an inode to a disk block |
| 553 | * @inode: The inode |
| 554 | * @lblock: The logical block number |
| 555 | * @bh_map: The bh to be mapped |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 556 | * @create: True if its ok to alloc blocks to satify the request |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 557 | * |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 558 | * Sets buffer_mapped() if successful, sets buffer_boundary() if a |
| 559 | * read of metadata will be required before the next block can be |
| 560 | * mapped. Sets buffer_new() if new blocks were allocated. |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 561 | * |
| 562 | * Returns: errno |
| 563 | */ |
| 564 | |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 565 | int gfs2_block_map(struct inode *inode, sector_t lblock, |
| 566 | struct buffer_head *bh_map, int create) |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 567 | { |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 568 | struct gfs2_inode *ip = GFS2_I(inode); |
| 569 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | ecc30c7 | 2008-01-28 10:37:35 +0000 | [diff] [blame] | 570 | unsigned int bsize = sdp->sd_sb.sb_bsize; |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 571 | const unsigned int maxlen = bh_map->b_size >> inode->i_blkbits; |
Steven Whitehouse | ecc30c7 | 2008-01-28 10:37:35 +0000 | [diff] [blame] | 572 | const u64 *arr = sdp->sd_heightsize; |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 573 | __be64 *ptr; |
| 574 | u64 size; |
| 575 | struct metapath mp; |
| 576 | int ret; |
| 577 | int eob; |
| 578 | unsigned int len; |
| 579 | struct buffer_head *bh; |
| 580 | u8 height; |
| 581 | |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 582 | BUG_ON(maxlen == 0); |
| 583 | |
Steven Whitehouse | dbac671 | 2008-01-29 09:12:55 +0000 | [diff] [blame] | 584 | memset(mp.mp_bh, 0, sizeof(mp.mp_bh)); |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 585 | bmap_lock(ip, create); |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 586 | clear_buffer_mapped(bh_map); |
| 587 | clear_buffer_new(bh_map); |
| 588 | clear_buffer_boundary(bh_map); |
Steven Whitehouse | ecc30c7 | 2008-01-28 10:37:35 +0000 | [diff] [blame] | 589 | if (gfs2_is_dir(ip)) { |
| 590 | bsize = sdp->sd_jbsize; |
| 591 | arr = sdp->sd_jheightsize; |
| 592 | } |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 593 | |
| 594 | ret = gfs2_meta_inode_buffer(ip, &mp.mp_bh[0]); |
| 595 | if (ret) |
| 596 | goto out; |
| 597 | |
| 598 | height = ip->i_height; |
Steven Whitehouse | 4cf1ed8 | 2006-11-15 15:21:06 -0500 | [diff] [blame] | 599 | size = (lblock + 1) * bsize; |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 600 | while (size > arr[height]) |
| 601 | height++; |
| 602 | find_metapath(sdp, lblock, &mp, height); |
| 603 | ret = 1; |
| 604 | if (height > ip->i_height || gfs2_is_stuffed(ip)) |
| 605 | goto do_alloc; |
| 606 | ret = lookup_metapath(ip, &mp); |
| 607 | if (ret < 0) |
| 608 | goto out; |
| 609 | if (ret != ip->i_height) |
| 610 | goto do_alloc; |
| 611 | ptr = metapointer(ip->i_height - 1, &mp); |
| 612 | if (*ptr == 0) |
| 613 | goto do_alloc; |
| 614 | map_bh(bh_map, inode->i_sb, be64_to_cpu(*ptr)); |
| 615 | bh = mp.mp_bh[ip->i_height - 1]; |
| 616 | len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen, &eob); |
| 617 | bh_map->b_size = (len << inode->i_blkbits); |
| 618 | if (eob) |
| 619 | set_buffer_boundary(bh_map); |
| 620 | ret = 0; |
| 621 | out: |
Steven Whitehouse | dbac671 | 2008-01-29 09:12:55 +0000 | [diff] [blame] | 622 | release_metapath(&mp); |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 623 | bmap_unlock(ip, create); |
| 624 | return ret; |
| 625 | |
| 626 | do_alloc: |
| 627 | /* All allocations are done here, firstly check create flag */ |
| 628 | if (!create) { |
| 629 | BUG_ON(gfs2_is_stuffed(ip)); |
| 630 | ret = 0; |
| 631 | goto out; |
| 632 | } |
| 633 | |
| 634 | /* At this point ret is the tree depth of already allocated blocks */ |
| 635 | ret = gfs2_bmap_alloc(inode, lblock, bh_map, &mp, ret, height, maxlen); |
| 636 | goto out; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 637 | } |
| 638 | |
Steven Whitehouse | 941e6d7 | 2008-01-28 08:47:38 +0000 | [diff] [blame] | 639 | /* |
| 640 | * Deprecated: do not use in new code |
| 641 | */ |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 642 | int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen) |
| 643 | { |
Steven Whitehouse | 2359125 | 2006-10-13 17:25:45 -0400 | [diff] [blame] | 644 | struct buffer_head bh = { .b_state = 0, .b_blocknr = 0 }; |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 645 | int ret; |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 646 | int create = *new; |
| 647 | |
| 648 | BUG_ON(!extlen); |
| 649 | BUG_ON(!dblock); |
| 650 | BUG_ON(!new); |
| 651 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 652 | bh.b_size = 1 << (inode->i_blkbits + (create ? 0 : 5)); |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 653 | ret = gfs2_block_map(inode, lblock, &bh, create); |
Steven Whitehouse | 7a6bbac | 2006-09-18 17:18:23 -0400 | [diff] [blame] | 654 | *extlen = bh.b_size >> inode->i_blkbits; |
| 655 | *dblock = bh.b_blocknr; |
| 656 | if (buffer_new(&bh)) |
| 657 | *new = 1; |
| 658 | else |
| 659 | *new = 0; |
| 660 | return ret; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 661 | } |
| 662 | |
| 663 | /** |
| 664 | * recursive_scan - recursively scan through the end of a file |
| 665 | * @ip: the inode |
| 666 | * @dibh: the dinode buffer |
| 667 | * @mp: the path through the metadata to the point to start |
| 668 | * @height: the height the recursion is at |
| 669 | * @block: the indirect block to look at |
| 670 | * @first: 1 if this is the first block |
| 671 | * @bc: the call to make for each piece of metadata |
| 672 | * @data: data opaque to this function to pass to @bc |
| 673 | * |
| 674 | * When this is first called @height and @block should be zero and |
| 675 | * @first should be 1. |
| 676 | * |
| 677 | * Returns: errno |
| 678 | */ |
| 679 | |
| 680 | static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh, |
| 681 | struct metapath *mp, unsigned int height, |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 682 | u64 block, int first, block_call_t bc, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 683 | void *data) |
| 684 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 685 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 686 | struct buffer_head *bh = NULL; |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 687 | __be64 *top, *bottom; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 688 | u64 bn; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 689 | int error; |
| 690 | int mh_size = sizeof(struct gfs2_meta_header); |
| 691 | |
| 692 | if (!height) { |
| 693 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 694 | if (error) |
| 695 | return error; |
| 696 | dibh = bh; |
| 697 | |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 698 | top = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0]; |
| 699 | bottom = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + sdp->sd_diptrs; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 700 | } else { |
| 701 | error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh); |
| 702 | if (error) |
| 703 | return error; |
| 704 | |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 705 | top = (__be64 *)(bh->b_data + mh_size) + |
Jan Engelhardt | c539212 | 2006-09-05 14:30:40 +0200 | [diff] [blame] | 706 | (first ? mp->mp_list[height] : 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 707 | |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 708 | bottom = (__be64 *)(bh->b_data + mh_size) + sdp->sd_inptrs; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 709 | } |
| 710 | |
| 711 | error = bc(ip, dibh, bh, top, bottom, height, data); |
| 712 | if (error) |
| 713 | goto out; |
| 714 | |
Steven Whitehouse | ecc30c7 | 2008-01-28 10:37:35 +0000 | [diff] [blame] | 715 | if (height < ip->i_height - 1) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 716 | for (; top < bottom; top++, first = 0) { |
| 717 | if (!*top) |
| 718 | continue; |
| 719 | |
| 720 | bn = be64_to_cpu(*top); |
| 721 | |
| 722 | error = recursive_scan(ip, dibh, mp, height + 1, bn, |
| 723 | first, bc, data); |
| 724 | if (error) |
| 725 | break; |
| 726 | } |
| 727 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 728 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 729 | brelse(bh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 730 | return error; |
| 731 | } |
| 732 | |
| 733 | /** |
| 734 | * do_strip - Look for a layer a particular layer of the file and strip it off |
| 735 | * @ip: the inode |
| 736 | * @dibh: the dinode buffer |
| 737 | * @bh: A buffer of pointers |
| 738 | * @top: The first pointer in the buffer |
| 739 | * @bottom: One more than the last pointer |
| 740 | * @height: the height this buffer is at |
| 741 | * @data: a pointer to a struct strip_mine |
| 742 | * |
| 743 | * Returns: errno |
| 744 | */ |
| 745 | |
| 746 | static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 747 | struct buffer_head *bh, __be64 *top, __be64 *bottom, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 748 | unsigned int height, void *data) |
| 749 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 750 | struct strip_mine *sm = data; |
| 751 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 752 | struct gfs2_rgrp_list rlist; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 753 | u64 bn, bstart; |
| 754 | u32 blen; |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 755 | __be64 *p; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 756 | unsigned int rg_blocks = 0; |
| 757 | int metadata; |
| 758 | unsigned int revokes = 0; |
| 759 | int x; |
| 760 | int error; |
| 761 | |
| 762 | if (!*top) |
| 763 | sm->sm_first = 0; |
| 764 | |
| 765 | if (height != sm->sm_height) |
| 766 | return 0; |
| 767 | |
| 768 | if (sm->sm_first) { |
| 769 | top++; |
| 770 | sm->sm_first = 0; |
| 771 | } |
| 772 | |
Steven Whitehouse | ecc30c7 | 2008-01-28 10:37:35 +0000 | [diff] [blame] | 773 | metadata = (height != ip->i_height - 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 774 | if (metadata) |
| 775 | revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs; |
| 776 | |
Steven Whitehouse | 6dbd822 | 2008-01-10 15:18:55 +0000 | [diff] [blame] | 777 | error = gfs2_rindex_hold(sdp, &ip->i_alloc->al_ri_gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 778 | if (error) |
| 779 | return error; |
| 780 | |
| 781 | memset(&rlist, 0, sizeof(struct gfs2_rgrp_list)); |
| 782 | bstart = 0; |
| 783 | blen = 0; |
| 784 | |
| 785 | for (p = top; p < bottom; p++) { |
| 786 | if (!*p) |
| 787 | continue; |
| 788 | |
| 789 | bn = be64_to_cpu(*p); |
| 790 | |
| 791 | if (bstart + blen == bn) |
| 792 | blen++; |
| 793 | else { |
| 794 | if (bstart) |
| 795 | gfs2_rlist_add(sdp, &rlist, bstart); |
| 796 | |
| 797 | bstart = bn; |
| 798 | blen = 1; |
| 799 | } |
| 800 | } |
| 801 | |
| 802 | if (bstart) |
| 803 | gfs2_rlist_add(sdp, &rlist, bstart); |
| 804 | else |
| 805 | goto out; /* Nothing to do */ |
| 806 | |
Bob Peterson | fe6c991 | 2008-01-28 11:13:02 -0600 | [diff] [blame] | 807 | gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 808 | |
| 809 | for (x = 0; x < rlist.rl_rgrps; x++) { |
| 810 | struct gfs2_rgrpd *rgd; |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 811 | rgd = rlist.rl_ghs[x].gh_gl->gl_object; |
Steven Whitehouse | bb8d8a6 | 2007-06-01 14:11:58 +0100 | [diff] [blame] | 812 | rg_blocks += rgd->rd_length; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 813 | } |
| 814 | |
| 815 | error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs); |
| 816 | if (error) |
| 817 | goto out_rlist; |
| 818 | |
| 819 | error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + |
| 820 | RES_INDIRECT + RES_STATFS + RES_QUOTA, |
| 821 | revokes); |
| 822 | if (error) |
| 823 | goto out_rg_gunlock; |
| 824 | |
| 825 | down_write(&ip->i_rw_mutex); |
| 826 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 827 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 828 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 829 | |
| 830 | bstart = 0; |
| 831 | blen = 0; |
| 832 | |
| 833 | for (p = top; p < bottom; p++) { |
| 834 | if (!*p) |
| 835 | continue; |
| 836 | |
| 837 | bn = be64_to_cpu(*p); |
| 838 | |
| 839 | if (bstart + blen == bn) |
| 840 | blen++; |
| 841 | else { |
| 842 | if (bstart) { |
| 843 | if (metadata) |
| 844 | gfs2_free_meta(ip, bstart, blen); |
| 845 | else |
| 846 | gfs2_free_data(ip, bstart, blen); |
| 847 | } |
| 848 | |
| 849 | bstart = bn; |
| 850 | blen = 1; |
| 851 | } |
| 852 | |
| 853 | *p = 0; |
Steven Whitehouse | 77658aa | 2008-02-12 14:17:27 +0000 | [diff] [blame] | 854 | gfs2_add_inode_blocks(&ip->i_inode, -1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 855 | } |
| 856 | if (bstart) { |
| 857 | if (metadata) |
| 858 | gfs2_free_meta(ip, bstart, blen); |
| 859 | else |
| 860 | gfs2_free_data(ip, bstart, blen); |
| 861 | } |
| 862 | |
Steven Whitehouse | 4bd91ba | 2007-06-05 09:39:18 +0100 | [diff] [blame] | 863 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 864 | |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 865 | gfs2_dinode_out(ip, dibh->b_data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 866 | |
| 867 | up_write(&ip->i_rw_mutex); |
| 868 | |
| 869 | gfs2_trans_end(sdp); |
| 870 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 871 | out_rg_gunlock: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 872 | gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 873 | out_rlist: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 874 | gfs2_rlist_free(&rlist); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 875 | out: |
Steven Whitehouse | 6dbd822 | 2008-01-10 15:18:55 +0000 | [diff] [blame] | 876 | gfs2_glock_dq_uninit(&ip->i_alloc->al_ri_gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 877 | return error; |
| 878 | } |
| 879 | |
| 880 | /** |
| 881 | * do_grow - Make a file look bigger than it is |
| 882 | * @ip: the inode |
| 883 | * @size: the size to set the file to |
| 884 | * |
| 885 | * Called with an exclusive lock on @ip. |
| 886 | * |
| 887 | * Returns: errno |
| 888 | */ |
| 889 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 890 | static int do_grow(struct gfs2_inode *ip, u64 size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 891 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 892 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 893 | struct gfs2_alloc *al; |
| 894 | struct buffer_head *dibh; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 895 | int error; |
| 896 | |
| 897 | al = gfs2_alloc_get(ip); |
Cyrill Gorcunov | 182fe5a | 2008-03-03 21:54:21 +0300 | [diff] [blame] | 898 | if (!al) |
| 899 | return -ENOMEM; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 900 | |
Steven Whitehouse | d82661d | 2008-03-10 15:34:50 +0000 | [diff] [blame] | 901 | error = gfs2_quota_lock_check(ip); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 902 | if (error) |
| 903 | goto out; |
| 904 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 905 | al->al_requested = sdp->sd_max_height + RES_DATA; |
| 906 | |
| 907 | error = gfs2_inplace_reserve(ip); |
| 908 | if (error) |
| 909 | goto out_gunlock_q; |
| 910 | |
| 911 | error = gfs2_trans_begin(sdp, |
Steven Whitehouse | bb8d8a6 | 2007-06-01 14:11:58 +0100 | [diff] [blame] | 912 | sdp->sd_max_height + al->al_rgd->rd_length + |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 913 | RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0); |
| 914 | if (error) |
| 915 | goto out_ipres; |
| 916 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 917 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 918 | if (error) |
| 919 | goto out_end_trans; |
| 920 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 921 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { |
| 922 | if (gfs2_is_stuffed(ip)) { |
| 923 | error = gfs2_unstuff_dinode(ip, NULL); |
| 924 | if (error) |
| 925 | goto out_brelse; |
| 926 | } |
| 927 | } |
| 928 | |
| 929 | ip->i_di.di_size = size; |
| 930 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 931 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 932 | gfs2_dinode_out(ip, dibh->b_data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 933 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 934 | out_brelse: |
| 935 | brelse(dibh); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 936 | out_end_trans: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 937 | gfs2_trans_end(sdp); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 938 | out_ipres: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 939 | gfs2_inplace_release(ip); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 940 | out_gunlock_q: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 941 | gfs2_quota_unlock(ip); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 942 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 943 | gfs2_alloc_put(ip); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 944 | return error; |
| 945 | } |
| 946 | |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 947 | |
| 948 | /** |
| 949 | * gfs2_block_truncate_page - Deal with zeroing out data for truncate |
| 950 | * |
| 951 | * This is partly borrowed from ext3. |
| 952 | */ |
| 953 | static int gfs2_block_truncate_page(struct address_space *mapping) |
| 954 | { |
| 955 | struct inode *inode = mapping->host; |
| 956 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 957 | loff_t from = inode->i_size; |
| 958 | unsigned long index = from >> PAGE_CACHE_SHIFT; |
| 959 | unsigned offset = from & (PAGE_CACHE_SIZE-1); |
| 960 | unsigned blocksize, iblock, length, pos; |
| 961 | struct buffer_head *bh; |
| 962 | struct page *page; |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 963 | int err; |
| 964 | |
| 965 | page = grab_cache_page(mapping, index); |
| 966 | if (!page) |
| 967 | return 0; |
| 968 | |
| 969 | blocksize = inode->i_sb->s_blocksize; |
| 970 | length = blocksize - (offset & (blocksize - 1)); |
| 971 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); |
| 972 | |
| 973 | if (!page_has_buffers(page)) |
| 974 | create_empty_buffers(page, blocksize, 0); |
| 975 | |
| 976 | /* Find the buffer that contains "offset" */ |
| 977 | bh = page_buffers(page); |
| 978 | pos = blocksize; |
| 979 | while (offset >= pos) { |
| 980 | bh = bh->b_this_page; |
| 981 | iblock++; |
| 982 | pos += blocksize; |
| 983 | } |
| 984 | |
| 985 | err = 0; |
| 986 | |
| 987 | if (!buffer_mapped(bh)) { |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 988 | gfs2_block_map(inode, iblock, bh, 0); |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 989 | /* unmapped? It's a hole - nothing to do */ |
| 990 | if (!buffer_mapped(bh)) |
| 991 | goto unlock; |
| 992 | } |
| 993 | |
| 994 | /* Ok, it's mapped. Make sure it's up-to-date */ |
| 995 | if (PageUptodate(page)) |
| 996 | set_buffer_uptodate(bh); |
| 997 | |
| 998 | if (!buffer_uptodate(bh)) { |
| 999 | err = -EIO; |
| 1000 | ll_rw_block(READ, 1, &bh); |
| 1001 | wait_on_buffer(bh); |
| 1002 | /* Uhhuh. Read error. Complain and punt. */ |
| 1003 | if (!buffer_uptodate(bh)) |
| 1004 | goto unlock; |
S. Wendy Cheng | 1875f2f | 2007-06-25 21:14:31 -0400 | [diff] [blame] | 1005 | err = 0; |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 1006 | } |
| 1007 | |
Steven Whitehouse | bf36a71 | 2007-10-17 08:35:19 +0100 | [diff] [blame] | 1008 | if (!gfs2_is_writeback(ip)) |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 1009 | gfs2_trans_add_bh(ip->i_gl, bh, 0); |
| 1010 | |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 1011 | zero_user(page, offset, length); |
Steven Whitehouse | ba7f729 | 2006-07-26 11:27:10 -0400 | [diff] [blame] | 1012 | |
| 1013 | unlock: |
| 1014 | unlock_page(page); |
| 1015 | page_cache_release(page); |
| 1016 | return err; |
| 1017 | } |
| 1018 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1019 | static int trunc_start(struct gfs2_inode *ip, u64 size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1020 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1021 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1022 | struct buffer_head *dibh; |
| 1023 | int journaled = gfs2_is_jdata(ip); |
| 1024 | int error; |
| 1025 | |
| 1026 | error = gfs2_trans_begin(sdp, |
Jan Engelhardt | c539212 | 2006-09-05 14:30:40 +0200 | [diff] [blame] | 1027 | RES_DINODE + (journaled ? RES_JDATA : 0), 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1028 | if (error) |
| 1029 | return error; |
| 1030 | |
| 1031 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 1032 | if (error) |
| 1033 | goto out; |
| 1034 | |
| 1035 | if (gfs2_is_stuffed(ip)) { |
| 1036 | ip->i_di.di_size = size; |
Steven Whitehouse | 4bd91ba | 2007-06-05 09:39:18 +0100 | [diff] [blame] | 1037 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 1038 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 1039 | gfs2_dinode_out(ip, dibh->b_data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1040 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size); |
| 1041 | error = 1; |
| 1042 | |
| 1043 | } else { |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1044 | if (size & (u64)(sdp->sd_sb.sb_bsize - 1)) |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1045 | error = gfs2_block_truncate_page(ip->i_inode.i_mapping); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1046 | |
| 1047 | if (!error) { |
| 1048 | ip->i_di.di_size = size; |
Steven Whitehouse | 4bd91ba | 2007-06-05 09:39:18 +0100 | [diff] [blame] | 1049 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1050 | ip->i_di.di_flags |= GFS2_DIF_TRUNC_IN_PROG; |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 1051 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 1052 | gfs2_dinode_out(ip, dibh->b_data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1053 | } |
| 1054 | } |
| 1055 | |
| 1056 | brelse(dibh); |
| 1057 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 1058 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1059 | gfs2_trans_end(sdp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1060 | return error; |
| 1061 | } |
| 1062 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1063 | static int trunc_dealloc(struct gfs2_inode *ip, u64 size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1064 | { |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 1065 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
Steven Whitehouse | ecc30c7 | 2008-01-28 10:37:35 +0000 | [diff] [blame] | 1066 | unsigned int height = ip->i_height; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1067 | u64 lblock; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1068 | struct metapath mp; |
| 1069 | int error; |
| 1070 | |
| 1071 | if (!size) |
| 1072 | lblock = 0; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 1073 | else |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 1074 | lblock = (size - 1) >> sdp->sd_sb.sb_bsize_shift; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1075 | |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 1076 | find_metapath(sdp, lblock, &mp, ip->i_height); |
Cyrill Gorcunov | 182fe5a | 2008-03-03 21:54:21 +0300 | [diff] [blame] | 1077 | if (!gfs2_alloc_get(ip)) |
| 1078 | return -ENOMEM; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1079 | |
| 1080 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
| 1081 | if (error) |
| 1082 | goto out; |
| 1083 | |
| 1084 | while (height--) { |
| 1085 | struct strip_mine sm; |
| 1086 | sm.sm_first = !!size; |
| 1087 | sm.sm_height = height; |
| 1088 | |
| 1089 | error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm); |
| 1090 | if (error) |
| 1091 | break; |
| 1092 | } |
| 1093 | |
| 1094 | gfs2_quota_unhold(ip); |
| 1095 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 1096 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1097 | gfs2_alloc_put(ip); |
| 1098 | return error; |
| 1099 | } |
| 1100 | |
| 1101 | static int trunc_end(struct gfs2_inode *ip) |
| 1102 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1103 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1104 | struct buffer_head *dibh; |
| 1105 | int error; |
| 1106 | |
| 1107 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
| 1108 | if (error) |
| 1109 | return error; |
| 1110 | |
| 1111 | down_write(&ip->i_rw_mutex); |
| 1112 | |
| 1113 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 1114 | if (error) |
| 1115 | goto out; |
| 1116 | |
| 1117 | if (!ip->i_di.di_size) { |
Steven Whitehouse | ecc30c7 | 2008-01-28 10:37:35 +0000 | [diff] [blame] | 1118 | ip->i_height = 0; |
Steven Whitehouse | ce276b0 | 2008-02-06 09:25:45 +0000 | [diff] [blame] | 1119 | ip->i_goal = ip->i_no_addr; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1120 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
| 1121 | } |
Steven Whitehouse | 4bd91ba | 2007-06-05 09:39:18 +0100 | [diff] [blame] | 1122 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1123 | ip->i_di.di_flags &= ~GFS2_DIF_TRUNC_IN_PROG; |
| 1124 | |
Steven Whitehouse | d4e9c4c | 2006-01-18 11:19:28 +0000 | [diff] [blame] | 1125 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 1126 | gfs2_dinode_out(ip, dibh->b_data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1127 | brelse(dibh); |
| 1128 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 1129 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1130 | up_write(&ip->i_rw_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1131 | gfs2_trans_end(sdp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1132 | return error; |
| 1133 | } |
| 1134 | |
| 1135 | /** |
| 1136 | * do_shrink - make a file smaller |
| 1137 | * @ip: the inode |
| 1138 | * @size: the size to make the file |
| 1139 | * @truncator: function to truncate the last partial block |
| 1140 | * |
| 1141 | * Called with an exclusive lock on @ip. |
| 1142 | * |
| 1143 | * Returns: errno |
| 1144 | */ |
| 1145 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1146 | static int do_shrink(struct gfs2_inode *ip, u64 size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1147 | { |
| 1148 | int error; |
| 1149 | |
Steven Whitehouse | aa6a85a | 2006-01-24 10:37:06 +0000 | [diff] [blame] | 1150 | error = trunc_start(ip, size); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1151 | if (error < 0) |
| 1152 | return error; |
| 1153 | if (error > 0) |
| 1154 | return 0; |
| 1155 | |
| 1156 | error = trunc_dealloc(ip, size); |
| 1157 | if (!error) |
| 1158 | error = trunc_end(ip); |
| 1159 | |
| 1160 | return error; |
| 1161 | } |
| 1162 | |
Wendy Cheng | a13b8c5 | 2007-08-20 09:29:53 -0400 | [diff] [blame] | 1163 | static int do_touch(struct gfs2_inode *ip, u64 size) |
| 1164 | { |
| 1165 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| 1166 | struct buffer_head *dibh; |
| 1167 | int error; |
| 1168 | |
| 1169 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
| 1170 | if (error) |
| 1171 | return error; |
| 1172 | |
| 1173 | down_write(&ip->i_rw_mutex); |
| 1174 | |
| 1175 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 1176 | if (error) |
| 1177 | goto do_touch_out; |
| 1178 | |
| 1179 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
| 1180 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 1181 | gfs2_dinode_out(ip, dibh->b_data); |
| 1182 | brelse(dibh); |
| 1183 | |
| 1184 | do_touch_out: |
| 1185 | up_write(&ip->i_rw_mutex); |
| 1186 | gfs2_trans_end(sdp); |
| 1187 | return error; |
| 1188 | } |
| 1189 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1190 | /** |
Steven Whitehouse | 666a2c5 | 2006-01-18 10:29:04 +0000 | [diff] [blame] | 1191 | * gfs2_truncatei - make a file a given size |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1192 | * @ip: the inode |
| 1193 | * @size: the size to make the file |
| 1194 | * @truncator: function to truncate the last partial block |
| 1195 | * |
| 1196 | * The file size can grow, shrink, or stay the same size. |
| 1197 | * |
| 1198 | * Returns: errno |
| 1199 | */ |
| 1200 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1201 | int gfs2_truncatei(struct gfs2_inode *ip, u64 size) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1202 | { |
| 1203 | int error; |
| 1204 | |
Steven Whitehouse | b60623c | 2006-11-01 12:22:46 -0500 | [diff] [blame] | 1205 | 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] | 1206 | return -EINVAL; |
| 1207 | |
| 1208 | if (size > ip->i_di.di_size) |
| 1209 | error = do_grow(ip, size); |
Wendy Cheng | a13b8c5 | 2007-08-20 09:29:53 -0400 | [diff] [blame] | 1210 | else if (size < ip->i_di.di_size) |
Steven Whitehouse | aa6a85a | 2006-01-24 10:37:06 +0000 | [diff] [blame] | 1211 | error = do_shrink(ip, size); |
Wendy Cheng | a13b8c5 | 2007-08-20 09:29:53 -0400 | [diff] [blame] | 1212 | else |
| 1213 | /* update time stamps */ |
| 1214 | error = do_touch(ip, size); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1215 | |
| 1216 | return error; |
| 1217 | } |
| 1218 | |
| 1219 | int gfs2_truncatei_resume(struct gfs2_inode *ip) |
| 1220 | { |
| 1221 | int error; |
| 1222 | error = trunc_dealloc(ip, ip->i_di.di_size); |
| 1223 | if (!error) |
| 1224 | error = trunc_end(ip); |
| 1225 | return error; |
| 1226 | } |
| 1227 | |
| 1228 | int gfs2_file_dealloc(struct gfs2_inode *ip) |
| 1229 | { |
| 1230 | return trunc_dealloc(ip, 0); |
| 1231 | } |
| 1232 | |
| 1233 | /** |
| 1234 | * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file |
| 1235 | * @ip: the file |
| 1236 | * @len: the number of bytes to be written to the file |
| 1237 | * @data_blocks: returns the number of data blocks required |
| 1238 | * @ind_blocks: returns the number of indirect blocks required |
| 1239 | * |
| 1240 | */ |
| 1241 | |
| 1242 | void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len, |
| 1243 | unsigned int *data_blocks, unsigned int *ind_blocks) |
| 1244 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1245 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1246 | unsigned int tmp; |
| 1247 | |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 1248 | if (gfs2_is_dir(ip)) { |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 1249 | *data_blocks = DIV_ROUND_UP(len, sdp->sd_jbsize) + 2; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1250 | *ind_blocks = 3 * (sdp->sd_max_jheight - 1); |
| 1251 | } else { |
| 1252 | *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3; |
| 1253 | *ind_blocks = 3 * (sdp->sd_max_height - 1); |
| 1254 | } |
| 1255 | |
| 1256 | for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) { |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 1257 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1258 | *ind_blocks += tmp; |
| 1259 | } |
| 1260 | } |
| 1261 | |
| 1262 | /** |
| 1263 | * gfs2_write_alloc_required - figure out if a write will require an allocation |
| 1264 | * @ip: the file being written to |
| 1265 | * @offset: the offset to write to |
| 1266 | * @len: the number of bytes being written |
| 1267 | * @alloc_required: set to 1 if an alloc is required, 0 otherwise |
| 1268 | * |
| 1269 | * Returns: errno |
| 1270 | */ |
| 1271 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1272 | int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1273 | unsigned int len, int *alloc_required) |
| 1274 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1275 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
Steven Whitehouse | 941e6d7 | 2008-01-28 08:47:38 +0000 | [diff] [blame] | 1276 | struct buffer_head bh; |
| 1277 | unsigned int shift; |
| 1278 | u64 lblock, lblock_stop, size; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1279 | |
| 1280 | *alloc_required = 0; |
| 1281 | |
| 1282 | if (!len) |
| 1283 | return 0; |
| 1284 | |
| 1285 | if (gfs2_is_stuffed(ip)) { |
| 1286 | if (offset + len > |
| 1287 | sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) |
| 1288 | *alloc_required = 1; |
| 1289 | return 0; |
| 1290 | } |
| 1291 | |
Steven Whitehouse | 941e6d7 | 2008-01-28 08:47:38 +0000 | [diff] [blame] | 1292 | *alloc_required = 1; |
| 1293 | shift = sdp->sd_sb.sb_bsize_shift; |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 1294 | if (gfs2_is_dir(ip)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1295 | unsigned int bsize = sdp->sd_jbsize; |
| 1296 | lblock = offset; |
| 1297 | do_div(lblock, bsize); |
| 1298 | lblock_stop = offset + len + bsize - 1; |
| 1299 | do_div(lblock_stop, bsize); |
| 1300 | } else { |
Steven Whitehouse | 1af5357 | 2008-01-16 14:24:05 +0000 | [diff] [blame] | 1301 | u64 end_of_file = (ip->i_di.di_size + sdp->sd_sb.sb_bsize - 1) >> shift; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1302 | lblock = offset >> shift; |
| 1303 | lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift; |
Steven Whitehouse | 941e6d7 | 2008-01-28 08:47:38 +0000 | [diff] [blame] | 1304 | if (lblock_stop > end_of_file) |
Bob Peterson | 0522053 | 2008-01-11 13:44:50 -0600 | [diff] [blame] | 1305 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1306 | } |
| 1307 | |
Steven Whitehouse | 941e6d7 | 2008-01-28 08:47:38 +0000 | [diff] [blame] | 1308 | size = (lblock_stop - lblock) << shift; |
| 1309 | do { |
| 1310 | bh.b_state = 0; |
| 1311 | bh.b_size = size; |
| 1312 | gfs2_block_map(&ip->i_inode, lblock, &bh, 0); |
| 1313 | if (!buffer_mapped(&bh)) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1314 | return 0; |
Steven Whitehouse | 941e6d7 | 2008-01-28 08:47:38 +0000 | [diff] [blame] | 1315 | size -= bh.b_size; |
| 1316 | lblock += (bh.b_size >> ip->i_inode.i_blkbits); |
| 1317 | } while(size > 0); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1318 | |
Steven Whitehouse | 941e6d7 | 2008-01-28 08:47:38 +0000 | [diff] [blame] | 1319 | *alloc_required = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1320 | return 0; |
| 1321 | } |
| 1322 | |