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 | |
| 10 | /* |
Steven Whitehouse | 61e085a | 2006-04-24 10:07:13 -0400 | [diff] [blame] | 11 | * Implements Extendible Hashing as described in: |
| 12 | * "Extendible Hashing" by Fagin, et al in |
| 13 | * __ACM Trans. on Database Systems__, Sept 1979. |
| 14 | * |
| 15 | * |
| 16 | * Here's the layout of dirents which is essentially the same as that of ext2 |
| 17 | * within a single block. The field de_name_len is the number of bytes |
| 18 | * actually required for the name (no null terminator). The field de_rec_len |
| 19 | * is the number of bytes allocated to the dirent. The offset of the next |
| 20 | * dirent in the block is (dirent + dirent->de_rec_len). When a dirent is |
| 21 | * deleted, the preceding dirent inherits its allocated space, ie |
| 22 | * prev->de_rec_len += deleted->de_rec_len. Since the next dirent is obtained |
| 23 | * by adding de_rec_len to the current dirent, this essentially causes the |
| 24 | * deleted dirent to get jumped over when iterating through all the dirents. |
| 25 | * |
| 26 | * When deleting the first dirent in a block, there is no previous dirent so |
| 27 | * the field de_ino is set to zero to designate it as deleted. When allocating |
| 28 | * a dirent, gfs2_dirent_alloc iterates through the dirents in a block. If the |
| 29 | * first dirent has (de_ino == 0) and de_rec_len is large enough, this first |
| 30 | * dirent is allocated. Otherwise it must go through all the 'used' dirents |
| 31 | * searching for one in which the amount of total space minus the amount of |
| 32 | * used space will provide enough space for the new dirent. |
| 33 | * |
| 34 | * There are two types of blocks in which dirents reside. In a stuffed dinode, |
| 35 | * the dirents begin at offset sizeof(struct gfs2_dinode) from the beginning of |
| 36 | * the block. In leaves, they begin at offset sizeof(struct gfs2_leaf) from the |
| 37 | * beginning of the leaf block. The dirents reside in leaves when |
| 38 | * |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 39 | * dip->i_diskflags & GFS2_DIF_EXHASH is true |
Steven Whitehouse | 61e085a | 2006-04-24 10:07:13 -0400 | [diff] [blame] | 40 | * |
| 41 | * Otherwise, the dirents are "linear", within a single stuffed dinode block. |
| 42 | * |
| 43 | * When the dirents are in leaves, the actual contents of the directory file are |
| 44 | * used as an array of 64-bit block pointers pointing to the leaf blocks. The |
| 45 | * dirents are NOT in the directory file itself. There can be more than one |
| 46 | * block pointer in the array that points to the same leaf. In fact, when a |
| 47 | * directory is first converted from linear to exhash, all of the pointers |
| 48 | * point to the same leaf. |
| 49 | * |
| 50 | * When a leaf is completely full, the size of the hash table can be |
| 51 | * doubled unless it is already at the maximum size which is hard coded into |
| 52 | * GFS2_DIR_MAX_DEPTH. After that, leaves are chained together in a linked list, |
| 53 | * but never before the maximum hash table size has been reached. |
| 54 | */ |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 55 | |
Joe Perches | d77d1b5 | 2014-03-06 12:10:45 -0800 | [diff] [blame] | 56 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 57 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 58 | #include <linux/slab.h> |
| 59 | #include <linux/spinlock.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 60 | #include <linux/buffer_head.h> |
| 61 | #include <linux/sort.h> |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 62 | #include <linux/gfs2_ondisk.h> |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 63 | #include <linux/crc32.h> |
Steven Whitehouse | fe1bded | 2006-04-18 10:09:15 -0400 | [diff] [blame] | 64 | #include <linux/vmalloc.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 65 | |
| 66 | #include "gfs2.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 67 | #include "incore.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 68 | #include "dir.h" |
| 69 | #include "glock.h" |
| 70 | #include "inode.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 71 | #include "meta_io.h" |
| 72 | #include "quota.h" |
| 73 | #include "rgrp.h" |
| 74 | #include "trans.h" |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 75 | #include "bmap.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 76 | #include "util.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 77 | |
| 78 | #define IS_LEAF 1 /* Hashed (leaf) directory */ |
| 79 | #define IS_DINODE 2 /* Linear (stuffed dinode block) directory */ |
| 80 | |
Bob Peterson | dfe4d34 | 2011-10-27 12:16:06 -0400 | [diff] [blame] | 81 | #define MAX_RA_BLOCKS 32 /* max read-ahead blocks */ |
| 82 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 83 | #define gfs2_disk_hash2offset(h) (((u64)(h)) >> 1) |
| 84 | #define gfs2_dir_offset2hash(p) ((u32)(((u64)(p)) << 1)) |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 85 | #define GFS2_HASH_INDEX_MASK 0xffffc000 |
| 86 | #define GFS2_USE_HASH_FLAG 0x2000 |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 87 | |
Steven Whitehouse | 8d12358 | 2010-09-17 12:30:23 +0100 | [diff] [blame] | 88 | struct qstr gfs2_qdot __read_mostly; |
| 89 | struct qstr gfs2_qdotdot __read_mostly; |
| 90 | |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 91 | typedef int (*gfs2_dscan_t)(const struct gfs2_dirent *dent, |
| 92 | const struct qstr *name, void *opaque); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 93 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 94 | int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block, |
Steven Whitehouse | 61e085a | 2006-04-24 10:07:13 -0400 | [diff] [blame] | 95 | struct buffer_head **bhp) |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 96 | { |
| 97 | struct buffer_head *bh; |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 98 | |
Steven Whitehouse | 61e085a | 2006-04-24 10:07:13 -0400 | [diff] [blame] | 99 | bh = gfs2_meta_new(ip->i_gl, block); |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 100 | gfs2_trans_add_meta(ip->i_gl, bh); |
Steven Whitehouse | 61e085a | 2006-04-24 10:07:13 -0400 | [diff] [blame] | 101 | gfs2_metatype_set(bh, GFS2_METATYPE_JD, GFS2_FORMAT_JD); |
| 102 | gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 103 | *bhp = bh; |
| 104 | return 0; |
| 105 | } |
| 106 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 107 | static int gfs2_dir_get_existing_buffer(struct gfs2_inode *ip, u64 block, |
Steven Whitehouse | 61e085a | 2006-04-24 10:07:13 -0400 | [diff] [blame] | 108 | struct buffer_head **bhp) |
| 109 | { |
| 110 | struct buffer_head *bh; |
| 111 | int error; |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 112 | |
Andreas Gruenbacher | c8d5770 | 2015-11-11 15:00:35 -0600 | [diff] [blame] | 113 | error = gfs2_meta_read(ip->i_gl, block, DIO_WAIT, 0, &bh); |
Steven Whitehouse | 61e085a | 2006-04-24 10:07:13 -0400 | [diff] [blame] | 114 | if (error) |
| 115 | return error; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 116 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_JD)) { |
Steven Whitehouse | 61e085a | 2006-04-24 10:07:13 -0400 | [diff] [blame] | 117 | brelse(bh); |
| 118 | return -EIO; |
| 119 | } |
| 120 | *bhp = bh; |
| 121 | return 0; |
| 122 | } |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 123 | |
| 124 | static int gfs2_dir_write_stuffed(struct gfs2_inode *ip, const char *buf, |
| 125 | unsigned int offset, unsigned int size) |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 126 | { |
| 127 | struct buffer_head *dibh; |
| 128 | int error; |
| 129 | |
| 130 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 131 | if (error) |
| 132 | return error; |
| 133 | |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 134 | gfs2_trans_add_meta(ip->i_gl, dibh); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 135 | memcpy(dibh->b_data + offset + sizeof(struct gfs2_dinode), buf, size); |
Steven Whitehouse | a2e0f79 | 2010-08-11 09:53:11 +0100 | [diff] [blame] | 136 | if (ip->i_inode.i_size < offset + size) |
| 137 | i_size_write(&ip->i_inode, offset + size); |
Steven Whitehouse | 4bd91ba | 2007-06-05 09:39:18 +0100 | [diff] [blame] | 138 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 139 | gfs2_dinode_out(ip, dibh->b_data); |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 140 | |
| 141 | brelse(dibh); |
| 142 | |
| 143 | return size; |
| 144 | } |
| 145 | |
| 146 | |
| 147 | |
| 148 | /** |
| 149 | * gfs2_dir_write_data - Write directory information to the inode |
| 150 | * @ip: The GFS2 inode |
| 151 | * @buf: The buffer containing information to be written |
| 152 | * @offset: The file offset to start writing at |
| 153 | * @size: The amount of data to write |
| 154 | * |
| 155 | * Returns: The number of bytes correctly written or error code |
| 156 | */ |
| 157 | static int gfs2_dir_write_data(struct gfs2_inode *ip, const char *buf, |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 158 | u64 offset, unsigned int size) |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 159 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 160 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 161 | struct buffer_head *dibh; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 162 | u64 lblock, dblock; |
| 163 | u32 extlen = 0; |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 164 | unsigned int o; |
| 165 | int copied = 0; |
| 166 | int error = 0; |
Steven Whitehouse | 9b8c81d | 2008-02-22 16:09:31 +0000 | [diff] [blame] | 167 | int new = 0; |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 168 | |
| 169 | if (!size) |
| 170 | return 0; |
| 171 | |
| 172 | if (gfs2_is_stuffed(ip) && |
| 173 | offset + size <= sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) |
Steven Whitehouse | 568f4c9 | 2006-02-27 12:00:42 -0500 | [diff] [blame] | 174 | return gfs2_dir_write_stuffed(ip, buf, (unsigned int)offset, |
| 175 | size); |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 176 | |
| 177 | if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip))) |
| 178 | return -EINVAL; |
| 179 | |
| 180 | if (gfs2_is_stuffed(ip)) { |
Steven Whitehouse | f25ef0c | 2006-07-26 10:51:20 -0400 | [diff] [blame] | 181 | error = gfs2_unstuff_dinode(ip, NULL); |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 182 | if (error) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 183 | return error; |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 184 | } |
| 185 | |
| 186 | lblock = offset; |
| 187 | o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header); |
| 188 | |
| 189 | while (copied < size) { |
| 190 | unsigned int amount; |
| 191 | struct buffer_head *bh; |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 192 | |
| 193 | amount = size - copied; |
| 194 | if (amount > sdp->sd_sb.sb_bsize - o) |
| 195 | amount = sdp->sd_sb.sb_bsize - o; |
| 196 | |
| 197 | if (!extlen) { |
| 198 | new = 1; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 199 | error = gfs2_extent_map(&ip->i_inode, lblock, &new, |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 200 | &dblock, &extlen); |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 201 | if (error) |
| 202 | goto fail; |
| 203 | error = -EIO; |
| 204 | if (gfs2_assert_withdraw(sdp, dblock)) |
| 205 | goto fail; |
| 206 | } |
| 207 | |
Steven Whitehouse | 61e085a | 2006-04-24 10:07:13 -0400 | [diff] [blame] | 208 | if (amount == sdp->sd_jbsize || new) |
| 209 | error = gfs2_dir_get_new_buffer(ip, dblock, &bh); |
| 210 | else |
| 211 | error = gfs2_dir_get_existing_buffer(ip, dblock, &bh); |
| 212 | |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 213 | if (error) |
| 214 | goto fail; |
| 215 | |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 216 | gfs2_trans_add_meta(ip->i_gl, bh); |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 217 | memcpy(bh->b_data + o, buf, amount); |
| 218 | brelse(bh); |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 219 | |
Steven Whitehouse | 899bb26 | 2006-08-01 15:28:57 -0400 | [diff] [blame] | 220 | buf += amount; |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 221 | copied += amount; |
| 222 | lblock++; |
| 223 | dblock++; |
| 224 | extlen--; |
| 225 | |
| 226 | o = sizeof(struct gfs2_meta_header); |
| 227 | } |
| 228 | |
| 229 | out: |
| 230 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 231 | if (error) |
| 232 | return error; |
| 233 | |
Steven Whitehouse | a2e0f79 | 2010-08-11 09:53:11 +0100 | [diff] [blame] | 234 | if (ip->i_inode.i_size < offset + copied) |
| 235 | i_size_write(&ip->i_inode, offset + copied); |
Steven Whitehouse | 4bd91ba | 2007-06-05 09:39:18 +0100 | [diff] [blame] | 236 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 237 | |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 238 | gfs2_trans_add_meta(ip->i_gl, dibh); |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 239 | gfs2_dinode_out(ip, dibh->b_data); |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 240 | brelse(dibh); |
| 241 | |
| 242 | return copied; |
| 243 | fail: |
| 244 | if (copied) |
| 245 | goto out; |
| 246 | return error; |
| 247 | } |
| 248 | |
Steven Whitehouse | 4c28d33 | 2011-07-26 09:17:28 +0100 | [diff] [blame] | 249 | static int gfs2_dir_read_stuffed(struct gfs2_inode *ip, __be64 *buf, |
| 250 | unsigned int size) |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 251 | { |
| 252 | struct buffer_head *dibh; |
| 253 | int error; |
| 254 | |
| 255 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 256 | if (!error) { |
Steven Whitehouse | 4c28d33 | 2011-07-26 09:17:28 +0100 | [diff] [blame] | 257 | memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 258 | brelse(dibh); |
| 259 | } |
| 260 | |
| 261 | return (error) ? error : size; |
| 262 | } |
| 263 | |
| 264 | |
| 265 | /** |
| 266 | * gfs2_dir_read_data - Read a data from a directory inode |
| 267 | * @ip: The GFS2 Inode |
| 268 | * @buf: The buffer to place result into |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 269 | * @size: Amount of data to transfer |
| 270 | * |
| 271 | * Returns: The amount of data actually copied or the error |
| 272 | */ |
Steven Whitehouse | 4c28d33 | 2011-07-26 09:17:28 +0100 | [diff] [blame] | 273 | static int gfs2_dir_read_data(struct gfs2_inode *ip, __be64 *buf, |
| 274 | unsigned int size) |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 275 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 276 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 277 | u64 lblock, dblock; |
| 278 | u32 extlen = 0; |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 279 | unsigned int o; |
| 280 | int copied = 0; |
| 281 | int error = 0; |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 282 | |
| 283 | if (gfs2_is_stuffed(ip)) |
Steven Whitehouse | 4c28d33 | 2011-07-26 09:17:28 +0100 | [diff] [blame] | 284 | return gfs2_dir_read_stuffed(ip, buf, size); |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 285 | |
| 286 | if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip))) |
| 287 | return -EINVAL; |
| 288 | |
Steven Whitehouse | 4c28d33 | 2011-07-26 09:17:28 +0100 | [diff] [blame] | 289 | lblock = 0; |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 290 | o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header); |
| 291 | |
| 292 | while (copied < size) { |
| 293 | unsigned int amount; |
| 294 | struct buffer_head *bh; |
| 295 | int new; |
| 296 | |
| 297 | amount = size - copied; |
| 298 | if (amount > sdp->sd_sb.sb_bsize - o) |
| 299 | amount = sdp->sd_sb.sb_bsize - o; |
| 300 | |
| 301 | if (!extlen) { |
| 302 | new = 0; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 303 | error = gfs2_extent_map(&ip->i_inode, lblock, &new, |
Steven Whitehouse | fd88de56 | 2006-05-05 16:59:11 -0400 | [diff] [blame] | 304 | &dblock, &extlen); |
Steven Whitehouse | 7276b3b | 2006-09-21 17:05:23 -0400 | [diff] [blame] | 305 | if (error || !dblock) |
| 306 | goto fail; |
| 307 | BUG_ON(extlen < 1); |
Steven Whitehouse | 7276b3b | 2006-09-21 17:05:23 -0400 | [diff] [blame] | 308 | bh = gfs2_meta_ra(ip->i_gl, dblock, extlen); |
Adrian Bunk | b7d8ac3 | 2006-10-19 16:02:07 +0200 | [diff] [blame] | 309 | } else { |
Andreas Gruenbacher | c8d5770 | 2015-11-11 15:00:35 -0600 | [diff] [blame] | 310 | error = gfs2_meta_read(ip->i_gl, dblock, DIO_WAIT, 0, &bh); |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 311 | if (error) |
| 312 | goto fail; |
| 313 | } |
Steven Whitehouse | 7276b3b | 2006-09-21 17:05:23 -0400 | [diff] [blame] | 314 | error = gfs2_metatype_check(sdp, bh, GFS2_METATYPE_JD); |
| 315 | if (error) { |
| 316 | brelse(bh); |
| 317 | goto fail; |
| 318 | } |
| 319 | dblock++; |
| 320 | extlen--; |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 321 | memcpy(buf, bh->b_data + o, amount); |
| 322 | brelse(bh); |
Steven Whitehouse | 4c28d33 | 2011-07-26 09:17:28 +0100 | [diff] [blame] | 323 | buf += (amount/sizeof(__be64)); |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 324 | copied += amount; |
| 325 | lblock++; |
Steven Whitehouse | e13940b | 2006-01-30 13:31:50 +0000 | [diff] [blame] | 326 | o = sizeof(struct gfs2_meta_header); |
| 327 | } |
| 328 | |
| 329 | return copied; |
| 330 | fail: |
| 331 | return (copied) ? copied : error; |
| 332 | } |
| 333 | |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 334 | /** |
| 335 | * gfs2_dir_get_hash_table - Get pointer to the dir hash table |
| 336 | * @ip: The inode in question |
| 337 | * |
| 338 | * Returns: The hash table or an error |
| 339 | */ |
| 340 | |
| 341 | static __be64 *gfs2_dir_get_hash_table(struct gfs2_inode *ip) |
| 342 | { |
| 343 | struct inode *inode = &ip->i_inode; |
| 344 | int ret; |
| 345 | u32 hsize; |
| 346 | __be64 *hc; |
| 347 | |
| 348 | BUG_ON(!(ip->i_diskflags & GFS2_DIF_EXHASH)); |
| 349 | |
| 350 | hc = ip->i_hash_cache; |
| 351 | if (hc) |
| 352 | return hc; |
| 353 | |
| 354 | hsize = 1 << ip->i_depth; |
| 355 | hsize *= sizeof(__be64); |
| 356 | if (hsize != i_size_read(&ip->i_inode)) { |
| 357 | gfs2_consist_inode(ip); |
| 358 | return ERR_PTR(-EIO); |
| 359 | } |
| 360 | |
Bob Peterson | e8830d8 | 2013-05-30 09:48:56 -0400 | [diff] [blame] | 361 | hc = kmalloc(hsize, GFP_NOFS | __GFP_NOWARN); |
| 362 | if (hc == NULL) |
| 363 | hc = __vmalloc(hsize, GFP_NOFS, PAGE_KERNEL); |
| 364 | |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 365 | if (hc == NULL) |
| 366 | return ERR_PTR(-ENOMEM); |
| 367 | |
Steven Whitehouse | 4c28d33 | 2011-07-26 09:17:28 +0100 | [diff] [blame] | 368 | ret = gfs2_dir_read_data(ip, hc, hsize); |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 369 | if (ret < 0) { |
Al Viro | 3cdcf63 | 2014-11-20 05:18:38 +0000 | [diff] [blame] | 370 | kvfree(hc); |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 371 | return ERR_PTR(ret); |
| 372 | } |
| 373 | |
| 374 | spin_lock(&inode->i_lock); |
Al Viro | 9265f1d | 2014-11-20 05:19:47 +0000 | [diff] [blame] | 375 | if (likely(!ip->i_hash_cache)) { |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 376 | ip->i_hash_cache = hc; |
Al Viro | 9265f1d | 2014-11-20 05:19:47 +0000 | [diff] [blame] | 377 | hc = NULL; |
| 378 | } |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 379 | spin_unlock(&inode->i_lock); |
Al Viro | 9265f1d | 2014-11-20 05:19:47 +0000 | [diff] [blame] | 380 | kvfree(hc); |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 381 | |
| 382 | return ip->i_hash_cache; |
| 383 | } |
| 384 | |
| 385 | /** |
| 386 | * gfs2_dir_hash_inval - Invalidate dir hash |
| 387 | * @ip: The directory inode |
| 388 | * |
| 389 | * Must be called with an exclusive glock, or during glock invalidation. |
| 390 | */ |
| 391 | void gfs2_dir_hash_inval(struct gfs2_inode *ip) |
| 392 | { |
Bob Peterson | c36b97e | 2015-10-29 10:03:41 -0500 | [diff] [blame] | 393 | __be64 *hc; |
| 394 | |
| 395 | spin_lock(&ip->i_inode.i_lock); |
| 396 | hc = ip->i_hash_cache; |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 397 | ip->i_hash_cache = NULL; |
Bob Peterson | c36b97e | 2015-10-29 10:03:41 -0500 | [diff] [blame] | 398 | spin_unlock(&ip->i_inode.i_lock); |
| 399 | |
Al Viro | 3cdcf63 | 2014-11-20 05:18:38 +0000 | [diff] [blame] | 400 | kvfree(hc); |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 401 | } |
| 402 | |
Steven Whitehouse | 5e7d65c | 2006-11-17 12:27:44 -0500 | [diff] [blame] | 403 | static inline int gfs2_dirent_sentinel(const struct gfs2_dirent *dent) |
| 404 | { |
| 405 | return dent->de_inum.no_addr == 0 || dent->de_inum.no_formal_ino == 0; |
| 406 | } |
| 407 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 408 | static inline int __gfs2_dirent_find(const struct gfs2_dirent *dent, |
| 409 | const struct qstr *name, int ret) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 410 | { |
Steven Whitehouse | 5e7d65c | 2006-11-17 12:27:44 -0500 | [diff] [blame] | 411 | if (!gfs2_dirent_sentinel(dent) && |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 412 | be32_to_cpu(dent->de_hash) == name->hash && |
| 413 | be16_to_cpu(dent->de_name_len) == name->len && |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 414 | memcmp(dent+1, name->name, name->len) == 0) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 415 | return ret; |
| 416 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 417 | } |
| 418 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 419 | static int gfs2_dirent_find(const struct gfs2_dirent *dent, |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 420 | const struct qstr *name, |
| 421 | void *opaque) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 422 | { |
| 423 | return __gfs2_dirent_find(dent, name, 1); |
| 424 | } |
| 425 | |
| 426 | static int gfs2_dirent_prev(const struct gfs2_dirent *dent, |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 427 | const struct qstr *name, |
| 428 | void *opaque) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 429 | { |
| 430 | return __gfs2_dirent_find(dent, name, 2); |
| 431 | } |
| 432 | |
| 433 | /* |
| 434 | * name->name holds ptr to start of block. |
| 435 | * name->len holds size of block. |
| 436 | */ |
| 437 | static int gfs2_dirent_last(const struct gfs2_dirent *dent, |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 438 | const struct qstr *name, |
| 439 | void *opaque) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 440 | { |
| 441 | const char *start = name->name; |
| 442 | const char *end = (const char *)dent + be16_to_cpu(dent->de_rec_len); |
| 443 | if (name->len == (end - start)) |
| 444 | return 1; |
| 445 | return 0; |
| 446 | } |
| 447 | |
Benjamin Marzinski | 3401747 | 2015-12-01 08:30:34 -0600 | [diff] [blame] | 448 | /* Look for the dirent that contains the offset specified in data. Once we |
| 449 | * find that dirent, there must be space available there for the new dirent */ |
| 450 | static int gfs2_dirent_find_offset(const struct gfs2_dirent *dent, |
| 451 | const struct qstr *name, |
| 452 | void *ptr) |
| 453 | { |
| 454 | unsigned required = GFS2_DIRENT_SIZE(name->len); |
| 455 | unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len)); |
| 456 | unsigned totlen = be16_to_cpu(dent->de_rec_len); |
| 457 | |
| 458 | if (ptr < (void *)dent || ptr >= (void *)dent + totlen) |
| 459 | return 0; |
| 460 | if (gfs2_dirent_sentinel(dent)) |
| 461 | actual = 0; |
| 462 | if (ptr < (void *)dent + actual) |
| 463 | return -1; |
| 464 | if ((void *)dent + totlen >= ptr + required) |
| 465 | return 1; |
| 466 | return -1; |
| 467 | } |
| 468 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 469 | static int gfs2_dirent_find_space(const struct gfs2_dirent *dent, |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 470 | const struct qstr *name, |
| 471 | void *opaque) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 472 | { |
| 473 | unsigned required = GFS2_DIRENT_SIZE(name->len); |
| 474 | unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len)); |
| 475 | unsigned totlen = be16_to_cpu(dent->de_rec_len); |
| 476 | |
Steven Whitehouse | 5e7d65c | 2006-11-17 12:27:44 -0500 | [diff] [blame] | 477 | if (gfs2_dirent_sentinel(dent)) |
Bob Peterson | 728a756 | 2010-07-14 18:12:26 -0400 | [diff] [blame] | 478 | actual = 0; |
Jan Engelhardt | c5392124 | 2006-09-05 14:30:40 +0200 | [diff] [blame] | 479 | if (totlen - actual >= required) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 480 | return 1; |
| 481 | return 0; |
| 482 | } |
| 483 | |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 484 | struct dirent_gather { |
| 485 | const struct gfs2_dirent **pdent; |
| 486 | unsigned offset; |
| 487 | }; |
| 488 | |
| 489 | static int gfs2_dirent_gather(const struct gfs2_dirent *dent, |
| 490 | const struct qstr *name, |
| 491 | void *opaque) |
| 492 | { |
| 493 | struct dirent_gather *g = opaque; |
Steven Whitehouse | 5e7d65c | 2006-11-17 12:27:44 -0500 | [diff] [blame] | 494 | if (!gfs2_dirent_sentinel(dent)) { |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 495 | g->pdent[g->offset++] = dent; |
| 496 | } |
| 497 | return 0; |
| 498 | } |
| 499 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 500 | /* |
| 501 | * Other possible things to check: |
| 502 | * - Inode located within filesystem size (and on valid block) |
| 503 | * - Valid directory entry type |
| 504 | * Not sure how heavy-weight we want to make this... could also check |
| 505 | * hash is correct for example, but that would take a lot of extra time. |
| 506 | * For now the most important thing is to check that the various sizes |
| 507 | * are correct. |
| 508 | */ |
| 509 | static int gfs2_check_dirent(struct gfs2_dirent *dent, unsigned int offset, |
| 510 | unsigned int size, unsigned int len, int first) |
| 511 | { |
| 512 | const char *msg = "gfs2_dirent too small"; |
| 513 | if (unlikely(size < sizeof(struct gfs2_dirent))) |
| 514 | goto error; |
| 515 | msg = "gfs2_dirent misaligned"; |
| 516 | if (unlikely(offset & 0x7)) |
| 517 | goto error; |
| 518 | msg = "gfs2_dirent points beyond end of block"; |
| 519 | if (unlikely(offset + size > len)) |
| 520 | goto error; |
| 521 | msg = "zero inode number"; |
Steven Whitehouse | 5e7d65c | 2006-11-17 12:27:44 -0500 | [diff] [blame] | 522 | if (unlikely(!first && gfs2_dirent_sentinel(dent))) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 523 | goto error; |
| 524 | msg = "name length is greater than space in dirent"; |
Steven Whitehouse | 5e7d65c | 2006-11-17 12:27:44 -0500 | [diff] [blame] | 525 | if (!gfs2_dirent_sentinel(dent) && |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 526 | unlikely(sizeof(struct gfs2_dirent)+be16_to_cpu(dent->de_name_len) > |
| 527 | size)) |
| 528 | goto error; |
| 529 | return 0; |
| 530 | error: |
Joe Perches | d77d1b5 | 2014-03-06 12:10:45 -0800 | [diff] [blame] | 531 | pr_warn("%s: %s (%s)\n", |
| 532 | __func__, msg, first ? "first in block" : "not first in block"); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 533 | return -EIO; |
| 534 | } |
| 535 | |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 536 | static int gfs2_dirent_offset(const void *buf) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 537 | { |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 538 | const struct gfs2_meta_header *h = buf; |
| 539 | int offset; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 540 | |
| 541 | BUG_ON(buf == NULL); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 542 | |
Steven Whitehouse | e3167de | 2006-03-30 15:46:23 -0500 | [diff] [blame] | 543 | switch(be32_to_cpu(h->mh_type)) { |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 544 | case GFS2_METATYPE_LF: |
| 545 | offset = sizeof(struct gfs2_leaf); |
| 546 | break; |
| 547 | case GFS2_METATYPE_DI: |
| 548 | offset = sizeof(struct gfs2_dinode); |
| 549 | break; |
| 550 | default: |
| 551 | goto wrong_type; |
| 552 | } |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 553 | return offset; |
| 554 | wrong_type: |
Joe Perches | d77d1b5 | 2014-03-06 12:10:45 -0800 | [diff] [blame] | 555 | pr_warn("%s: wrong block type %u\n", __func__, be32_to_cpu(h->mh_type)); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 556 | return -1; |
| 557 | } |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 558 | |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 559 | static struct gfs2_dirent *gfs2_dirent_scan(struct inode *inode, void *buf, |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 560 | unsigned int len, gfs2_dscan_t scan, |
| 561 | const struct qstr *name, |
| 562 | void *opaque) |
| 563 | { |
| 564 | struct gfs2_dirent *dent, *prev; |
| 565 | unsigned offset; |
| 566 | unsigned size; |
| 567 | int ret = 0; |
| 568 | |
| 569 | ret = gfs2_dirent_offset(buf); |
| 570 | if (ret < 0) |
| 571 | goto consist_inode; |
| 572 | |
| 573 | offset = ret; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 574 | prev = NULL; |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 575 | dent = buf + offset; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 576 | size = be16_to_cpu(dent->de_rec_len); |
| 577 | if (gfs2_check_dirent(dent, offset, size, len, 1)) |
| 578 | goto consist_inode; |
| 579 | do { |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 580 | ret = scan(dent, name, opaque); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 581 | if (ret) |
| 582 | break; |
| 583 | offset += size; |
| 584 | if (offset == len) |
| 585 | break; |
| 586 | prev = dent; |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 587 | dent = buf + offset; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 588 | size = be16_to_cpu(dent->de_rec_len); |
| 589 | if (gfs2_check_dirent(dent, offset, size, len, 0)) |
| 590 | goto consist_inode; |
| 591 | } while(1); |
| 592 | |
| 593 | switch(ret) { |
| 594 | case 0: |
| 595 | return NULL; |
| 596 | case 1: |
| 597 | return dent; |
| 598 | case 2: |
| 599 | return prev ? prev : dent; |
| 600 | default: |
| 601 | BUG_ON(ret > 0); |
| 602 | return ERR_PTR(ret); |
| 603 | } |
| 604 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 605 | consist_inode: |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 606 | gfs2_consist_inode(GFS2_I(inode)); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 607 | return ERR_PTR(-EIO); |
| 608 | } |
| 609 | |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 610 | static int dirent_check_reclen(struct gfs2_inode *dip, |
| 611 | const struct gfs2_dirent *d, const void *end_p) |
| 612 | { |
| 613 | const void *ptr = d; |
| 614 | u16 rec_len = be16_to_cpu(d->de_rec_len); |
| 615 | |
| 616 | if (unlikely(rec_len < sizeof(struct gfs2_dirent))) |
| 617 | goto broken; |
| 618 | ptr += rec_len; |
| 619 | if (ptr < end_p) |
| 620 | return rec_len; |
| 621 | if (ptr == end_p) |
| 622 | return -ENOENT; |
| 623 | broken: |
| 624 | gfs2_consist_inode(dip); |
| 625 | return -EIO; |
| 626 | } |
| 627 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 628 | /** |
| 629 | * dirent_next - Next dirent |
| 630 | * @dip: the directory |
| 631 | * @bh: The buffer |
| 632 | * @dent: Pointer to list of dirents |
| 633 | * |
| 634 | * Returns: 0 on success, error code otherwise |
| 635 | */ |
| 636 | |
| 637 | static int dirent_next(struct gfs2_inode *dip, struct buffer_head *bh, |
| 638 | struct gfs2_dirent **dent) |
| 639 | { |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 640 | struct gfs2_dirent *cur = *dent, *tmp; |
| 641 | char *bh_end = bh->b_data + bh->b_size; |
| 642 | int ret; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 643 | |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 644 | ret = dirent_check_reclen(dip, cur, bh_end); |
| 645 | if (ret < 0) |
| 646 | return ret; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 647 | |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 648 | tmp = (void *)cur + ret; |
| 649 | ret = dirent_check_reclen(dip, tmp, bh_end); |
| 650 | if (ret == -EIO) |
| 651 | return ret; |
Steven Whitehouse | 4dd651a | 2006-02-14 15:56:44 +0000 | [diff] [blame] | 652 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 653 | /* Only the first dent could ever have de_inum.no_addr == 0 */ |
Steven Whitehouse | 5e7d65c | 2006-11-17 12:27:44 -0500 | [diff] [blame] | 654 | if (gfs2_dirent_sentinel(tmp)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 655 | gfs2_consist_inode(dip); |
| 656 | return -EIO; |
| 657 | } |
| 658 | |
| 659 | *dent = tmp; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 660 | return 0; |
| 661 | } |
| 662 | |
| 663 | /** |
| 664 | * dirent_del - Delete a dirent |
| 665 | * @dip: The GFS2 inode |
| 666 | * @bh: The buffer |
| 667 | * @prev: The previous dirent |
| 668 | * @cur: The current dirent |
| 669 | * |
| 670 | */ |
| 671 | |
| 672 | static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh, |
| 673 | struct gfs2_dirent *prev, struct gfs2_dirent *cur) |
| 674 | { |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 675 | u16 cur_rec_len, prev_rec_len; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 676 | |
Steven Whitehouse | 5e7d65c | 2006-11-17 12:27:44 -0500 | [diff] [blame] | 677 | if (gfs2_dirent_sentinel(cur)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 678 | gfs2_consist_inode(dip); |
| 679 | return; |
| 680 | } |
| 681 | |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 682 | gfs2_trans_add_meta(dip->i_gl, bh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 683 | |
| 684 | /* If there is no prev entry, this is the first entry in the block. |
| 685 | The de_rec_len is already as big as it needs to be. Just zero |
| 686 | out the inode number and return. */ |
| 687 | |
| 688 | if (!prev) { |
Steven Whitehouse | 5e7d65c | 2006-11-17 12:27:44 -0500 | [diff] [blame] | 689 | cur->de_inum.no_addr = 0; |
| 690 | cur->de_inum.no_formal_ino = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 691 | return; |
| 692 | } |
| 693 | |
| 694 | /* Combine this dentry with the previous one. */ |
| 695 | |
Steven Whitehouse | fc69d0d | 2006-02-13 16:21:47 +0000 | [diff] [blame] | 696 | prev_rec_len = be16_to_cpu(prev->de_rec_len); |
| 697 | cur_rec_len = be16_to_cpu(cur->de_rec_len); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 698 | |
| 699 | if ((char *)prev + prev_rec_len != (char *)cur) |
| 700 | gfs2_consist_inode(dip); |
| 701 | if ((char *)cur + cur_rec_len > bh->b_data + bh->b_size) |
| 702 | gfs2_consist_inode(dip); |
| 703 | |
| 704 | prev_rec_len += cur_rec_len; |
Steven Whitehouse | fc69d0d | 2006-02-13 16:21:47 +0000 | [diff] [blame] | 705 | prev->de_rec_len = cpu_to_be16(prev_rec_len); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 706 | } |
| 707 | |
Benjamin Marzinski | 3401747 | 2015-12-01 08:30:34 -0600 | [diff] [blame] | 708 | |
| 709 | static struct gfs2_dirent *do_init_dirent(struct inode *inode, |
| 710 | struct gfs2_dirent *dent, |
| 711 | const struct qstr *name, |
| 712 | struct buffer_head *bh, |
| 713 | unsigned offset) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 714 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 715 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 716 | struct gfs2_dirent *ndent; |
Benjamin Marzinski | 3401747 | 2015-12-01 08:30:34 -0600 | [diff] [blame] | 717 | unsigned totlen; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 718 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 719 | totlen = be16_to_cpu(dent->de_rec_len); |
| 720 | BUG_ON(offset + name->len > totlen); |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 721 | gfs2_trans_add_meta(ip->i_gl, bh); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 722 | ndent = (struct gfs2_dirent *)((char *)dent + offset); |
| 723 | dent->de_rec_len = cpu_to_be16(offset); |
| 724 | gfs2_qstr2dirent(name, totlen - offset, ndent); |
| 725 | return ndent; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 726 | } |
| 727 | |
Benjamin Marzinski | 3401747 | 2015-12-01 08:30:34 -0600 | [diff] [blame] | 728 | |
| 729 | /* |
| 730 | * Takes a dent from which to grab space as an argument. Returns the |
| 731 | * newly created dent. |
| 732 | */ |
| 733 | static struct gfs2_dirent *gfs2_init_dirent(struct inode *inode, |
| 734 | struct gfs2_dirent *dent, |
| 735 | const struct qstr *name, |
| 736 | struct buffer_head *bh) |
| 737 | { |
| 738 | unsigned offset = 0; |
| 739 | |
| 740 | if (!gfs2_dirent_sentinel(dent)) |
| 741 | offset = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len)); |
| 742 | return do_init_dirent(inode, dent, name, bh, offset); |
| 743 | } |
| 744 | |
| 745 | static struct gfs2_dirent *gfs2_dirent_split_alloc(struct inode *inode, |
| 746 | struct buffer_head *bh, |
| 747 | const struct qstr *name, |
| 748 | void *ptr) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 749 | { |
| 750 | struct gfs2_dirent *dent; |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 751 | dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, |
Benjamin Marzinski | 3401747 | 2015-12-01 08:30:34 -0600 | [diff] [blame] | 752 | gfs2_dirent_find_offset, name, ptr); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 753 | if (!dent || IS_ERR(dent)) |
| 754 | return dent; |
Benjamin Marzinski | 3401747 | 2015-12-01 08:30:34 -0600 | [diff] [blame] | 755 | return do_init_dirent(inode, dent, name, bh, |
| 756 | (unsigned)(ptr - (void *)dent)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 757 | } |
| 758 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 759 | static int get_leaf(struct gfs2_inode *dip, u64 leaf_no, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 760 | struct buffer_head **bhp) |
| 761 | { |
| 762 | int error; |
| 763 | |
Andreas Gruenbacher | c8d5770 | 2015-11-11 15:00:35 -0600 | [diff] [blame] | 764 | error = gfs2_meta_read(dip->i_gl, leaf_no, DIO_WAIT, 0, bhp); |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 765 | if (!error && gfs2_metatype_check(GFS2_SB(&dip->i_inode), *bhp, GFS2_METATYPE_LF)) { |
Joe Perches | d77d1b5 | 2014-03-06 12:10:45 -0800 | [diff] [blame] | 766 | /* pr_info("block num=%llu\n", leaf_no); */ |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 767 | error = -EIO; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 768 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 769 | |
| 770 | return error; |
| 771 | } |
| 772 | |
| 773 | /** |
| 774 | * get_leaf_nr - Get a leaf number associated with the index |
| 775 | * @dip: The GFS2 inode |
| 776 | * @index: |
| 777 | * @leaf_out: |
| 778 | * |
| 779 | * Returns: 0 on success, error code otherwise |
| 780 | */ |
| 781 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 782 | static int get_leaf_nr(struct gfs2_inode *dip, u32 index, |
| 783 | u64 *leaf_out) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 784 | { |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 785 | __be64 *hash; |
Arnd Bergmann | 287980e | 2016-05-27 23:23:25 +0200 | [diff] [blame] | 786 | int error; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 787 | |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 788 | hash = gfs2_dir_get_hash_table(dip); |
Arnd Bergmann | 287980e | 2016-05-27 23:23:25 +0200 | [diff] [blame] | 789 | error = PTR_ERR_OR_ZERO(hash); |
| 790 | |
| 791 | if (!error) |
| 792 | *leaf_out = be64_to_cpu(*(hash + index)); |
| 793 | |
| 794 | return error; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 795 | } |
| 796 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 797 | static int get_first_leaf(struct gfs2_inode *dip, u32 index, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 798 | struct buffer_head **bh_out) |
| 799 | { |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 800 | u64 leaf_no; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 801 | int error; |
| 802 | |
| 803 | error = get_leaf_nr(dip, index, &leaf_no); |
Arnd Bergmann | 287980e | 2016-05-27 23:23:25 +0200 | [diff] [blame] | 804 | if (!error) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 805 | error = get_leaf(dip, leaf_no, bh_out); |
| 806 | |
| 807 | return error; |
| 808 | } |
| 809 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 810 | static struct gfs2_dirent *gfs2_dirent_search(struct inode *inode, |
| 811 | const struct qstr *name, |
| 812 | gfs2_dscan_t scan, |
| 813 | struct buffer_head **pbh) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 814 | { |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 815 | struct buffer_head *bh; |
| 816 | struct gfs2_dirent *dent; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 817 | struct gfs2_inode *ip = GFS2_I(inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 818 | int error; |
| 819 | |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 820 | if (ip->i_diskflags & GFS2_DIF_EXHASH) { |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 821 | struct gfs2_leaf *leaf; |
Steven Whitehouse | 9a00450 | 2008-02-01 09:23:44 +0000 | [diff] [blame] | 822 | unsigned hsize = 1 << ip->i_depth; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 823 | unsigned index; |
| 824 | u64 ln; |
Steven Whitehouse | a2e0f79 | 2010-08-11 09:53:11 +0100 | [diff] [blame] | 825 | if (hsize * sizeof(u64) != i_size_read(inode)) { |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 826 | gfs2_consist_inode(ip); |
| 827 | return ERR_PTR(-EIO); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 828 | } |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 829 | |
Steven Whitehouse | 9a00450 | 2008-02-01 09:23:44 +0000 | [diff] [blame] | 830 | index = name->hash >> (32 - ip->i_depth); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 831 | error = get_first_leaf(ip, index, &bh); |
| 832 | if (error) |
| 833 | return ERR_PTR(error); |
| 834 | do { |
| 835 | dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 836 | scan, name, NULL); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 837 | if (dent) |
| 838 | goto got_dent; |
| 839 | leaf = (struct gfs2_leaf *)bh->b_data; |
| 840 | ln = be64_to_cpu(leaf->lf_next); |
Steven Whitehouse | f4154ea | 2006-04-11 14:49:06 -0400 | [diff] [blame] | 841 | brelse(bh); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 842 | if (!ln) |
| 843 | break; |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 844 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 845 | error = get_leaf(ip, ln, &bh); |
| 846 | } while(!error); |
| 847 | |
| 848 | return error ? ERR_PTR(error) : NULL; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 849 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 850 | |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 851 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 852 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 853 | if (error) |
| 854 | return ERR_PTR(error); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 855 | dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, scan, name, NULL); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 856 | got_dent: |
Steven Whitehouse | f4154ea | 2006-04-11 14:49:06 -0400 | [diff] [blame] | 857 | if (unlikely(dent == NULL || IS_ERR(dent))) { |
Steven Whitehouse | ed38650 | 2006-04-07 16:28:07 -0400 | [diff] [blame] | 858 | brelse(bh); |
| 859 | bh = NULL; |
| 860 | } |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 861 | *pbh = bh; |
| 862 | return dent; |
| 863 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 864 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 865 | static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh, u16 depth) |
| 866 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 867 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | b45e41d | 2008-02-06 10:11:15 +0000 | [diff] [blame] | 868 | unsigned int n = 1; |
Steven Whitehouse | 0901097 | 2009-05-20 10:48:47 +0100 | [diff] [blame] | 869 | u64 bn; |
| 870 | int error; |
| 871 | struct buffer_head *bh; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 872 | struct gfs2_leaf *leaf; |
| 873 | struct gfs2_dirent *dent; |
Linus Torvalds | 26fe575 | 2012-05-10 13:14:12 -0700 | [diff] [blame] | 874 | struct qstr name = { .name = "" }; |
Steven Whitehouse | 01bcb0d | 2014-01-08 12:14:57 +0000 | [diff] [blame] | 875 | struct timespec tv = CURRENT_TIME; |
Steven Whitehouse | 0901097 | 2009-05-20 10:48:47 +0100 | [diff] [blame] | 876 | |
Bob Peterson | 6e87ed0 | 2011-11-18 10:58:32 -0500 | [diff] [blame] | 877 | error = gfs2_alloc_blocks(ip, &bn, &n, 0, NULL); |
Steven Whitehouse | 0901097 | 2009-05-20 10:48:47 +0100 | [diff] [blame] | 878 | if (error) |
| 879 | return NULL; |
| 880 | bh = gfs2_meta_new(ip->i_gl, bn); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 881 | if (!bh) |
| 882 | return NULL; |
Steven Whitehouse | 0901097 | 2009-05-20 10:48:47 +0100 | [diff] [blame] | 883 | |
Steven Whitehouse | 5731be5 | 2008-02-01 13:16:55 +0000 | [diff] [blame] | 884 | gfs2_trans_add_unrevoke(GFS2_SB(inode), bn, 1); |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 885 | gfs2_trans_add_meta(ip->i_gl, bh); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 886 | gfs2_metatype_set(bh, GFS2_METATYPE_LF, GFS2_FORMAT_LF); |
| 887 | leaf = (struct gfs2_leaf *)bh->b_data; |
| 888 | leaf->lf_depth = cpu_to_be16(depth); |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 889 | leaf->lf_entries = 0; |
Al Viro | a2d7d02 | 2006-10-14 16:49:30 +0100 | [diff] [blame] | 890 | leaf->lf_dirent_format = cpu_to_be32(GFS2_FORMAT_DE); |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 891 | leaf->lf_next = 0; |
Steven Whitehouse | 01bcb0d | 2014-01-08 12:14:57 +0000 | [diff] [blame] | 892 | leaf->lf_inode = cpu_to_be64(ip->i_no_addr); |
| 893 | leaf->lf_dist = cpu_to_be32(1); |
| 894 | leaf->lf_nsec = cpu_to_be32(tv.tv_nsec); |
| 895 | leaf->lf_sec = cpu_to_be64(tv.tv_sec); |
| 896 | memset(leaf->lf_reserved2, 0, sizeof(leaf->lf_reserved2)); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 897 | dent = (struct gfs2_dirent *)(leaf+1); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 898 | gfs2_qstr2dirent(&name, bh->b_size - sizeof(struct gfs2_leaf), dent); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 899 | *pbh = bh; |
| 900 | return leaf; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 901 | } |
| 902 | |
| 903 | /** |
| 904 | * dir_make_exhash - Convert a stuffed directory into an ExHash directory |
| 905 | * @dip: The GFS2 inode |
| 906 | * |
| 907 | * Returns: 0 on success, error code otherwise |
| 908 | */ |
| 909 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 910 | static int dir_make_exhash(struct inode *inode) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 911 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 912 | struct gfs2_inode *dip = GFS2_I(inode); |
| 913 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 914 | struct gfs2_dirent *dent; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 915 | struct qstr args; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 916 | struct buffer_head *bh, *dibh; |
| 917 | struct gfs2_leaf *leaf; |
| 918 | int y; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 919 | u32 x; |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 920 | __be64 *lp; |
| 921 | u64 bn; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 922 | int error; |
| 923 | |
| 924 | error = gfs2_meta_inode_buffer(dip, &dibh); |
| 925 | if (error) |
| 926 | return error; |
| 927 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 928 | /* Turn over a new leaf */ |
| 929 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 930 | leaf = new_leaf(inode, &bh, 0); |
| 931 | if (!leaf) |
| 932 | return -ENOSPC; |
| 933 | bn = bh->b_blocknr; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 934 | |
Steven Whitehouse | ad6203f | 2008-11-03 13:59:19 +0000 | [diff] [blame] | 935 | gfs2_assert(sdp, dip->i_entries < (1 << 16)); |
| 936 | leaf->lf_entries = cpu_to_be16(dip->i_entries); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 937 | |
| 938 | /* Copy dirents */ |
| 939 | |
| 940 | gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_leaf), dibh, |
| 941 | sizeof(struct gfs2_dinode)); |
| 942 | |
| 943 | /* Find last entry */ |
| 944 | |
| 945 | x = 0; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 946 | args.len = bh->b_size - sizeof(struct gfs2_dinode) + |
| 947 | sizeof(struct gfs2_leaf); |
| 948 | args.name = bh->b_data; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 949 | dent = gfs2_dirent_scan(&dip->i_inode, bh->b_data, bh->b_size, |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 950 | gfs2_dirent_last, &args, NULL); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 951 | if (!dent) { |
| 952 | brelse(bh); |
| 953 | brelse(dibh); |
| 954 | return -EIO; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 955 | } |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 956 | if (IS_ERR(dent)) { |
| 957 | brelse(bh); |
| 958 | brelse(dibh); |
| 959 | return PTR_ERR(dent); |
| 960 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 961 | |
| 962 | /* Adjust the last dirent's record length |
| 963 | (Remember that dent still points to the last entry.) */ |
| 964 | |
Steven Whitehouse | 4dd651a | 2006-02-14 15:56:44 +0000 | [diff] [blame] | 965 | dent->de_rec_len = cpu_to_be16(be16_to_cpu(dent->de_rec_len) + |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 966 | sizeof(struct gfs2_dinode) - |
Steven Whitehouse | 4dd651a | 2006-02-14 15:56:44 +0000 | [diff] [blame] | 967 | sizeof(struct gfs2_leaf)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 968 | |
| 969 | brelse(bh); |
| 970 | |
| 971 | /* We're done with the new leaf block, now setup the new |
| 972 | hash table. */ |
| 973 | |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 974 | gfs2_trans_add_meta(dip->i_gl, dibh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 975 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
| 976 | |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 977 | lp = (__be64 *)(dibh->b_data + sizeof(struct gfs2_dinode)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 978 | |
| 979 | for (x = sdp->sd_hash_ptrs; x--; lp++) |
| 980 | *lp = cpu_to_be64(bn); |
| 981 | |
Steven Whitehouse | a2e0f79 | 2010-08-11 09:53:11 +0100 | [diff] [blame] | 982 | i_size_write(inode, sdp->sd_sb.sb_bsize / 2); |
Steven Whitehouse | 77658aa | 2008-02-12 14:17:27 +0000 | [diff] [blame] | 983 | gfs2_add_inode_blocks(&dip->i_inode, 1); |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 984 | dip->i_diskflags |= GFS2_DIF_EXHASH; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 985 | |
| 986 | for (x = sdp->sd_hash_ptrs, y = -1; x; x >>= 1, y++) ; |
Steven Whitehouse | 9a00450 | 2008-02-01 09:23:44 +0000 | [diff] [blame] | 987 | dip->i_depth = y; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 988 | |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 989 | gfs2_dinode_out(dip, dibh->b_data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 990 | |
| 991 | brelse(dibh); |
| 992 | |
| 993 | return 0; |
| 994 | } |
| 995 | |
| 996 | /** |
| 997 | * dir_split_leaf - Split a leaf block into two |
| 998 | * @dip: The GFS2 inode |
| 999 | * @index: |
| 1000 | * @leaf_no: |
| 1001 | * |
| 1002 | * Returns: 0 on success, error code on failure |
| 1003 | */ |
| 1004 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1005 | static int dir_split_leaf(struct inode *inode, const struct qstr *name) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1006 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1007 | struct gfs2_inode *dip = GFS2_I(inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1008 | struct buffer_head *nbh, *obh, *dibh; |
| 1009 | struct gfs2_leaf *nleaf, *oleaf; |
Steven Whitehouse | 4da3c64 | 2006-07-11 13:19:13 -0400 | [diff] [blame] | 1010 | struct gfs2_dirent *dent = NULL, *prev = NULL, *next = NULL, *new; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1011 | u32 start, len, half_len, divider; |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 1012 | u64 bn, leaf_no; |
| 1013 | __be64 *lp; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1014 | u32 index; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1015 | int x, moved = 0; |
| 1016 | int error; |
| 1017 | |
Steven Whitehouse | 9a00450 | 2008-02-01 09:23:44 +0000 | [diff] [blame] | 1018 | index = name->hash >> (32 - dip->i_depth); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1019 | error = get_leaf_nr(dip, index, &leaf_no); |
Arnd Bergmann | 287980e | 2016-05-27 23:23:25 +0200 | [diff] [blame] | 1020 | if (error) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1021 | return error; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1022 | |
| 1023 | /* Get the old leaf block */ |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1024 | error = get_leaf(dip, leaf_no, &obh); |
| 1025 | if (error) |
Steven Whitehouse | e90deff | 2006-03-29 19:02:15 -0500 | [diff] [blame] | 1026 | return error; |
| 1027 | |
| 1028 | oleaf = (struct gfs2_leaf *)obh->b_data; |
Steven Whitehouse | 9a00450 | 2008-02-01 09:23:44 +0000 | [diff] [blame] | 1029 | if (dip->i_depth == be16_to_cpu(oleaf->lf_depth)) { |
Steven Whitehouse | e90deff | 2006-03-29 19:02:15 -0500 | [diff] [blame] | 1030 | brelse(obh); |
| 1031 | return 1; /* can't split */ |
| 1032 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1033 | |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 1034 | gfs2_trans_add_meta(dip->i_gl, obh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1035 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1036 | nleaf = new_leaf(inode, &nbh, be16_to_cpu(oleaf->lf_depth) + 1); |
| 1037 | if (!nleaf) { |
| 1038 | brelse(obh); |
| 1039 | return -ENOSPC; |
| 1040 | } |
| 1041 | bn = nbh->b_blocknr; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1042 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1043 | /* Compute the start and len of leaf pointers in the hash table. */ |
Steven Whitehouse | 9a00450 | 2008-02-01 09:23:44 +0000 | [diff] [blame] | 1044 | len = 1 << (dip->i_depth - be16_to_cpu(oleaf->lf_depth)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1045 | half_len = len >> 1; |
| 1046 | if (!half_len) { |
Joe Perches | d77d1b5 | 2014-03-06 12:10:45 -0800 | [diff] [blame] | 1047 | pr_warn("i_depth %u lf_depth %u index %u\n", |
| 1048 | dip->i_depth, be16_to_cpu(oleaf->lf_depth), index); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1049 | gfs2_consist_inode(dip); |
| 1050 | error = -EIO; |
| 1051 | goto fail_brelse; |
| 1052 | } |
| 1053 | |
| 1054 | start = (index & ~(len - 1)); |
| 1055 | |
| 1056 | /* Change the pointers. |
| 1057 | Don't bother distinguishing stuffed from non-stuffed. |
| 1058 | This code is complicated enough already. */ |
David Rientjes | 4244b52 | 2010-07-20 19:45:03 -0700 | [diff] [blame] | 1059 | lp = kmalloc(half_len * sizeof(__be64), GFP_NOFS); |
| 1060 | if (!lp) { |
| 1061 | error = -ENOMEM; |
| 1062 | goto fail_brelse; |
| 1063 | } |
| 1064 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1065 | /* Change the pointers */ |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1066 | for (x = 0; x < half_len; x++) |
| 1067 | lp[x] = cpu_to_be64(bn); |
| 1068 | |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 1069 | gfs2_dir_hash_inval(dip); |
| 1070 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1071 | error = gfs2_dir_write_data(dip, (char *)lp, start * sizeof(u64), |
| 1072 | half_len * sizeof(u64)); |
| 1073 | if (error != half_len * sizeof(u64)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1074 | if (error >= 0) |
| 1075 | error = -EIO; |
| 1076 | goto fail_lpfree; |
| 1077 | } |
| 1078 | |
| 1079 | kfree(lp); |
| 1080 | |
| 1081 | /* Compute the divider */ |
Steven Whitehouse | 9a00450 | 2008-02-01 09:23:44 +0000 | [diff] [blame] | 1082 | divider = (start + half_len) << (32 - dip->i_depth); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1083 | |
| 1084 | /* Copy the entries */ |
Steven Whitehouse | 1579343 | 2009-11-06 11:06:37 +0000 | [diff] [blame] | 1085 | dent = (struct gfs2_dirent *)(obh->b_data + sizeof(struct gfs2_leaf)); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1086 | |
| 1087 | do { |
| 1088 | next = dent; |
| 1089 | if (dirent_next(dip, obh, &next)) |
| 1090 | next = NULL; |
| 1091 | |
Steven Whitehouse | 5e7d65c | 2006-11-17 12:27:44 -0500 | [diff] [blame] | 1092 | if (!gfs2_dirent_sentinel(dent) && |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1093 | be32_to_cpu(dent->de_hash) < divider) { |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1094 | struct qstr str; |
Benjamin Marzinski | 3401747 | 2015-12-01 08:30:34 -0600 | [diff] [blame] | 1095 | void *ptr = ((char *)dent - obh->b_data) + nbh->b_data; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1096 | str.name = (char*)(dent+1); |
| 1097 | str.len = be16_to_cpu(dent->de_name_len); |
| 1098 | str.hash = be32_to_cpu(dent->de_hash); |
Benjamin Marzinski | 3401747 | 2015-12-01 08:30:34 -0600 | [diff] [blame] | 1099 | new = gfs2_dirent_split_alloc(inode, nbh, &str, ptr); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1100 | if (IS_ERR(new)) { |
| 1101 | error = PTR_ERR(new); |
| 1102 | break; |
| 1103 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1104 | |
| 1105 | new->de_inum = dent->de_inum; /* No endian worries */ |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1106 | new->de_type = dent->de_type; /* No endian worries */ |
Marcin Slusarz | bb16b34 | 2008-02-13 00:06:10 +0100 | [diff] [blame] | 1107 | be16_add_cpu(&nleaf->lf_entries, 1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1108 | |
| 1109 | dirent_del(dip, obh, prev, dent); |
| 1110 | |
| 1111 | if (!oleaf->lf_entries) |
| 1112 | gfs2_consist_inode(dip); |
Marcin Slusarz | bb16b34 | 2008-02-13 00:06:10 +0100 | [diff] [blame] | 1113 | be16_add_cpu(&oleaf->lf_entries, -1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1114 | |
| 1115 | if (!prev) |
| 1116 | prev = dent; |
| 1117 | |
| 1118 | moved = 1; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1119 | } else { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1120 | prev = dent; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1121 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1122 | dent = next; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1123 | } while (dent); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1124 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1125 | oleaf->lf_depth = nleaf->lf_depth; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1126 | |
| 1127 | error = gfs2_meta_inode_buffer(dip, &dibh); |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1128 | if (!gfs2_assert_withdraw(GFS2_SB(&dip->i_inode), !error)) { |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 1129 | gfs2_trans_add_meta(dip->i_gl, dibh); |
Steven Whitehouse | 77658aa | 2008-02-12 14:17:27 +0000 | [diff] [blame] | 1130 | gfs2_add_inode_blocks(&dip->i_inode, 1); |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 1131 | gfs2_dinode_out(dip, dibh->b_data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1132 | brelse(dibh); |
| 1133 | } |
| 1134 | |
| 1135 | brelse(obh); |
| 1136 | brelse(nbh); |
| 1137 | |
| 1138 | return error; |
| 1139 | |
Steven Whitehouse | e90deff | 2006-03-29 19:02:15 -0500 | [diff] [blame] | 1140 | fail_lpfree: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1141 | kfree(lp); |
| 1142 | |
Steven Whitehouse | e90deff | 2006-03-29 19:02:15 -0500 | [diff] [blame] | 1143 | fail_brelse: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1144 | brelse(obh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1145 | brelse(nbh); |
| 1146 | return error; |
| 1147 | } |
| 1148 | |
| 1149 | /** |
| 1150 | * dir_double_exhash - Double size of ExHash table |
| 1151 | * @dip: The GFS2 dinode |
| 1152 | * |
| 1153 | * Returns: 0 on success, error code on failure |
| 1154 | */ |
| 1155 | |
| 1156 | static int dir_double_exhash(struct gfs2_inode *dip) |
| 1157 | { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1158 | struct buffer_head *dibh; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1159 | u32 hsize; |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 1160 | u32 hsize_bytes; |
| 1161 | __be64 *hc; |
| 1162 | __be64 *hc2, *h; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1163 | int x; |
| 1164 | int error = 0; |
| 1165 | |
Steven Whitehouse | 9a00450 | 2008-02-01 09:23:44 +0000 | [diff] [blame] | 1166 | hsize = 1 << dip->i_depth; |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 1167 | hsize_bytes = hsize * sizeof(__be64); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1168 | |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 1169 | hc = gfs2_dir_get_hash_table(dip); |
| 1170 | if (IS_ERR(hc)) |
| 1171 | return PTR_ERR(hc); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1172 | |
Bob Peterson | 512cbf0 | 2013-06-14 08:39:18 -0400 | [diff] [blame] | 1173 | hc2 = kmalloc(hsize_bytes * 2, GFP_NOFS | __GFP_NOWARN); |
Bob Peterson | e8830d8 | 2013-05-30 09:48:56 -0400 | [diff] [blame] | 1174 | if (hc2 == NULL) |
| 1175 | hc2 = __vmalloc(hsize_bytes * 2, GFP_NOFS, PAGE_KERNEL); |
| 1176 | |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 1177 | if (!hc2) |
David Rientjes | 4244b52 | 2010-07-20 19:45:03 -0700 | [diff] [blame] | 1178 | return -ENOMEM; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1179 | |
Bob Peterson | 512cbf0 | 2013-06-14 08:39:18 -0400 | [diff] [blame] | 1180 | h = hc2; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1181 | error = gfs2_meta_inode_buffer(dip, &dibh); |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 1182 | if (error) |
| 1183 | goto out_kfree; |
| 1184 | |
| 1185 | for (x = 0; x < hsize; x++) { |
| 1186 | *h++ = *hc; |
| 1187 | *h++ = *hc; |
| 1188 | hc++; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1189 | } |
| 1190 | |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 1191 | error = gfs2_dir_write_data(dip, (char *)hc2, 0, hsize_bytes * 2); |
| 1192 | if (error != (hsize_bytes * 2)) |
| 1193 | goto fail; |
| 1194 | |
| 1195 | gfs2_dir_hash_inval(dip); |
| 1196 | dip->i_hash_cache = hc2; |
| 1197 | dip->i_depth++; |
| 1198 | gfs2_dinode_out(dip, dibh->b_data); |
| 1199 | brelse(dibh); |
| 1200 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1201 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 1202 | fail: |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 1203 | /* Replace original hash table & size */ |
| 1204 | gfs2_dir_write_data(dip, (char *)hc, 0, hsize_bytes); |
| 1205 | i_size_write(&dip->i_inode, hsize_bytes); |
| 1206 | gfs2_dinode_out(dip, dibh->b_data); |
| 1207 | brelse(dibh); |
| 1208 | out_kfree: |
Al Viro | 3cdcf63 | 2014-11-20 05:18:38 +0000 | [diff] [blame] | 1209 | kvfree(hc2); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1210 | return error; |
| 1211 | } |
| 1212 | |
| 1213 | /** |
| 1214 | * compare_dents - compare directory entries by hash value |
| 1215 | * @a: first dent |
| 1216 | * @b: second dent |
| 1217 | * |
| 1218 | * When comparing the hash entries of @a to @b: |
| 1219 | * gt: returns 1 |
| 1220 | * lt: returns -1 |
| 1221 | * eq: returns 0 |
| 1222 | */ |
| 1223 | |
| 1224 | static int compare_dents(const void *a, const void *b) |
| 1225 | { |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 1226 | const struct gfs2_dirent *dent_a, *dent_b; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1227 | u32 hash_a, hash_b; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1228 | int ret = 0; |
| 1229 | |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 1230 | dent_a = *(const struct gfs2_dirent **)a; |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1231 | hash_a = dent_a->de_cookie; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1232 | |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 1233 | dent_b = *(const struct gfs2_dirent **)b; |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1234 | hash_b = dent_b->de_cookie; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1235 | |
| 1236 | if (hash_a > hash_b) |
| 1237 | ret = 1; |
| 1238 | else if (hash_a < hash_b) |
| 1239 | ret = -1; |
| 1240 | else { |
Steven Whitehouse | 4dd651a | 2006-02-14 15:56:44 +0000 | [diff] [blame] | 1241 | unsigned int len_a = be16_to_cpu(dent_a->de_name_len); |
| 1242 | unsigned int len_b = be16_to_cpu(dent_b->de_name_len); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1243 | |
| 1244 | if (len_a > len_b) |
| 1245 | ret = 1; |
| 1246 | else if (len_a < len_b) |
| 1247 | ret = -1; |
| 1248 | else |
Steven Whitehouse | 2bdbc5d | 2006-09-05 09:34:20 -0400 | [diff] [blame] | 1249 | ret = memcmp(dent_a + 1, dent_b + 1, len_a); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1250 | } |
| 1251 | |
| 1252 | return ret; |
| 1253 | } |
| 1254 | |
| 1255 | /** |
| 1256 | * do_filldir_main - read out directory entries |
| 1257 | * @dip: The GFS2 inode |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1258 | * @ctx: what to feed the entries to |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1259 | * @darr: an array of struct gfs2_dirent pointers to read |
| 1260 | * @entries: the number of entries in darr |
| 1261 | * @copied: pointer to int that's non-zero if a entry has been copied out |
| 1262 | * |
| 1263 | * Jump through some hoops to make sure that if there are hash collsions, |
| 1264 | * they are read out at the beginning of a buffer. We want to minimize |
| 1265 | * the possibility that they will fall into different readdir buffers or |
| 1266 | * that someone will want to seek to that location. |
| 1267 | * |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1268 | * Returns: errno, >0 if the actor tells you to stop |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1269 | */ |
| 1270 | |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1271 | static int do_filldir_main(struct gfs2_inode *dip, struct dir_context *ctx, |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1272 | struct gfs2_dirent **darr, u32 entries, |
| 1273 | u32 sort_start, int *copied) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1274 | { |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1275 | const struct gfs2_dirent *dent, *dent_next; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1276 | u64 off, off_next; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1277 | unsigned int x, y; |
| 1278 | int run = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1279 | |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1280 | if (sort_start < entries) |
| 1281 | sort(&darr[sort_start], entries - sort_start, |
| 1282 | sizeof(struct gfs2_dirent *), compare_dents, NULL); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1283 | |
| 1284 | dent_next = darr[0]; |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1285 | off_next = dent_next->de_cookie; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1286 | |
| 1287 | for (x = 0, y = 1; x < entries; x++, y++) { |
| 1288 | dent = dent_next; |
| 1289 | off = off_next; |
| 1290 | |
| 1291 | if (y < entries) { |
| 1292 | dent_next = darr[y]; |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1293 | off_next = dent_next->de_cookie; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1294 | |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1295 | if (off < ctx->pos) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1296 | continue; |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1297 | ctx->pos = off; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1298 | |
| 1299 | if (off_next == off) { |
| 1300 | if (*copied && !run) |
| 1301 | return 1; |
| 1302 | run = 1; |
| 1303 | } else |
| 1304 | run = 0; |
| 1305 | } else { |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1306 | if (off < ctx->pos) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1307 | continue; |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1308 | ctx->pos = off; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1309 | } |
| 1310 | |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1311 | if (!dir_emit(ctx, (const char *)(dent + 1), |
Steven Whitehouse | 4dd651a | 2006-02-14 15:56:44 +0000 | [diff] [blame] | 1312 | be16_to_cpu(dent->de_name_len), |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1313 | be64_to_cpu(dent->de_inum.no_addr), |
| 1314 | be16_to_cpu(dent->de_type))) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1315 | return 1; |
| 1316 | |
| 1317 | *copied = 1; |
| 1318 | } |
| 1319 | |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1320 | /* Increment the ctx->pos by one, so the next time we come into the |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1321 | do_filldir fxn, we get the next entry instead of the last one in the |
| 1322 | current leaf */ |
| 1323 | |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1324 | ctx->pos++; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1325 | |
| 1326 | return 0; |
| 1327 | } |
| 1328 | |
Steven Whitehouse | d2a97a4 | 2010-07-28 17:56:23 +0100 | [diff] [blame] | 1329 | static void *gfs2_alloc_sort_buffer(unsigned size) |
| 1330 | { |
| 1331 | void *ptr = NULL; |
| 1332 | |
| 1333 | if (size < KMALLOC_MAX_SIZE) |
| 1334 | ptr = kmalloc(size, GFP_NOFS | __GFP_NOWARN); |
| 1335 | if (!ptr) |
| 1336 | ptr = __vmalloc(size, GFP_NOFS, PAGE_KERNEL); |
| 1337 | return ptr; |
| 1338 | } |
| 1339 | |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1340 | |
| 1341 | static int gfs2_set_cookies(struct gfs2_sbd *sdp, struct buffer_head *bh, |
| 1342 | unsigned leaf_nr, struct gfs2_dirent **darr, |
| 1343 | unsigned entries) |
| 1344 | { |
| 1345 | int sort_id = -1; |
| 1346 | int i; |
| 1347 | |
| 1348 | for (i = 0; i < entries; i++) { |
| 1349 | unsigned offset; |
| 1350 | |
| 1351 | darr[i]->de_cookie = be32_to_cpu(darr[i]->de_hash); |
| 1352 | darr[i]->de_cookie = gfs2_disk_hash2offset(darr[i]->de_cookie); |
| 1353 | |
| 1354 | if (!sdp->sd_args.ar_loccookie) |
| 1355 | continue; |
| 1356 | offset = (char *)(darr[i]) - |
| 1357 | (bh->b_data + gfs2_dirent_offset(bh->b_data)); |
| 1358 | offset /= GFS2_MIN_DIRENT_SIZE; |
| 1359 | offset += leaf_nr * sdp->sd_max_dents_per_leaf; |
| 1360 | if (offset >= GFS2_USE_HASH_FLAG || |
| 1361 | leaf_nr >= GFS2_USE_HASH_FLAG) { |
| 1362 | darr[i]->de_cookie |= GFS2_USE_HASH_FLAG; |
| 1363 | if (sort_id < 0) |
| 1364 | sort_id = i; |
| 1365 | continue; |
| 1366 | } |
| 1367 | darr[i]->de_cookie &= GFS2_HASH_INDEX_MASK; |
| 1368 | darr[i]->de_cookie |= offset; |
| 1369 | } |
| 1370 | return sort_id; |
| 1371 | } |
| 1372 | |
| 1373 | |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1374 | static int gfs2_dir_read_leaf(struct inode *inode, struct dir_context *ctx, |
| 1375 | int *copied, unsigned *depth, |
Steven Whitehouse | 3699e3a | 2007-01-17 15:09:20 +0000 | [diff] [blame] | 1376 | u64 leaf_no) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1377 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1378 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | bdd19a2 | 2007-04-18 09:38:42 +0100 | [diff] [blame] | 1379 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1380 | struct buffer_head *bh; |
| 1381 | struct gfs2_leaf *lf; |
Steven Whitehouse | bdd19a2 | 2007-04-18 09:38:42 +0100 | [diff] [blame] | 1382 | unsigned entries = 0, entries2 = 0; |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1383 | unsigned leaves = 0, leaf = 0, offset, sort_offset; |
| 1384 | struct gfs2_dirent **darr, *dent; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1385 | struct dirent_gather g; |
| 1386 | struct buffer_head **larr; |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1387 | int error, i, need_sort = 0, sort_id; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1388 | u64 lfn = leaf_no; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1389 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1390 | do { |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1391 | error = get_leaf(ip, lfn, &bh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1392 | if (error) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1393 | goto out; |
| 1394 | lf = (struct gfs2_leaf *)bh->b_data; |
| 1395 | if (leaves == 0) |
| 1396 | *depth = be16_to_cpu(lf->lf_depth); |
| 1397 | entries += be16_to_cpu(lf->lf_entries); |
| 1398 | leaves++; |
| 1399 | lfn = be64_to_cpu(lf->lf_next); |
| 1400 | brelse(bh); |
| 1401 | } while(lfn); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1402 | |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1403 | if (*depth < GFS2_DIR_MAX_DEPTH || !sdp->sd_args.ar_loccookie) { |
| 1404 | need_sort = 1; |
| 1405 | sort_offset = 0; |
| 1406 | } |
| 1407 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1408 | if (!entries) |
| 1409 | return 0; |
| 1410 | |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1411 | error = -ENOMEM; |
Steven Whitehouse | bdd19a2 | 2007-04-18 09:38:42 +0100 | [diff] [blame] | 1412 | /* |
| 1413 | * The extra 99 entries are not normally used, but are a buffer |
| 1414 | * zone in case the number of entries in the leaf is corrupt. |
| 1415 | * 99 is the maximum number of entries that can fit in a single |
| 1416 | * leaf block. |
| 1417 | */ |
Steven Whitehouse | d2a97a4 | 2010-07-28 17:56:23 +0100 | [diff] [blame] | 1418 | larr = gfs2_alloc_sort_buffer((leaves + entries + 99) * sizeof(void *)); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1419 | if (!larr) |
| 1420 | goto out; |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1421 | darr = (struct gfs2_dirent **)(larr + leaves); |
| 1422 | g.pdent = (const struct gfs2_dirent **)darr; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1423 | g.offset = 0; |
| 1424 | lfn = leaf_no; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1425 | |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1426 | do { |
| 1427 | error = get_leaf(ip, lfn, &bh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1428 | if (error) |
Steven Whitehouse | d2a97a4 | 2010-07-28 17:56:23 +0100 | [diff] [blame] | 1429 | goto out_free; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1430 | lf = (struct gfs2_leaf *)bh->b_data; |
| 1431 | lfn = be64_to_cpu(lf->lf_next); |
| 1432 | if (lf->lf_entries) { |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1433 | offset = g.offset; |
Steven Whitehouse | bdd19a2 | 2007-04-18 09:38:42 +0100 | [diff] [blame] | 1434 | entries2 += be16_to_cpu(lf->lf_entries); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1435 | dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, |
| 1436 | gfs2_dirent_gather, NULL, &g); |
| 1437 | error = PTR_ERR(dent); |
Steven Whitehouse | bdd19a2 | 2007-04-18 09:38:42 +0100 | [diff] [blame] | 1438 | if (IS_ERR(dent)) |
Steven Whitehouse | d2a97a4 | 2010-07-28 17:56:23 +0100 | [diff] [blame] | 1439 | goto out_free; |
Steven Whitehouse | bdd19a2 | 2007-04-18 09:38:42 +0100 | [diff] [blame] | 1440 | if (entries2 != g.offset) { |
akpm@linux-foundation.org | f391a4e | 2007-04-25 21:08:02 -0700 | [diff] [blame] | 1441 | fs_warn(sdp, "Number of entries corrupt in dir " |
| 1442 | "leaf %llu, entries2 (%u) != " |
| 1443 | "g.offset (%u)\n", |
| 1444 | (unsigned long long)bh->b_blocknr, |
| 1445 | entries2, g.offset); |
Steven Whitehouse | bdd19a2 | 2007-04-18 09:38:42 +0100 | [diff] [blame] | 1446 | |
| 1447 | error = -EIO; |
Steven Whitehouse | d2a97a4 | 2010-07-28 17:56:23 +0100 | [diff] [blame] | 1448 | goto out_free; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1449 | } |
| 1450 | error = 0; |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1451 | sort_id = gfs2_set_cookies(sdp, bh, leaf, &darr[offset], |
| 1452 | be16_to_cpu(lf->lf_entries)); |
| 1453 | if (!need_sort && sort_id >= 0) { |
| 1454 | need_sort = 1; |
| 1455 | sort_offset = offset + sort_id; |
| 1456 | } |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1457 | larr[leaf++] = bh; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1458 | } else { |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1459 | larr[leaf++] = NULL; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1460 | brelse(bh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1461 | } |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1462 | } while(lfn); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1463 | |
Steven Whitehouse | bdd19a2 | 2007-04-18 09:38:42 +0100 | [diff] [blame] | 1464 | BUG_ON(entries2 != entries); |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1465 | error = do_filldir_main(ip, ctx, darr, entries, need_sort ? |
| 1466 | sort_offset : entries, copied); |
Steven Whitehouse | d2a97a4 | 2010-07-28 17:56:23 +0100 | [diff] [blame] | 1467 | out_free: |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1468 | for(i = 0; i < leaf; i++) |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1469 | if (larr[i]) |
| 1470 | brelse(larr[i]); |
Al Viro | 3cdcf63 | 2014-11-20 05:18:38 +0000 | [diff] [blame] | 1471 | kvfree(larr); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1472 | out: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1473 | return error; |
| 1474 | } |
| 1475 | |
Steven Whitehouse | 79c4c37 | 2011-11-09 13:46:06 +0000 | [diff] [blame] | 1476 | /** |
| 1477 | * gfs2_dir_readahead - Issue read-ahead requests for leaf blocks. |
Bob Peterson | dfe4d34 | 2011-10-27 12:16:06 -0400 | [diff] [blame] | 1478 | * |
| 1479 | * Note: we can't calculate each index like dir_e_read can because we don't |
| 1480 | * have the leaf, and therefore we don't have the depth, and therefore we |
| 1481 | * don't have the length. So we have to just read enough ahead to make up |
Steven Whitehouse | 79c4c37 | 2011-11-09 13:46:06 +0000 | [diff] [blame] | 1482 | * for the loss of information. |
| 1483 | */ |
Bob Peterson | dfe4d34 | 2011-10-27 12:16:06 -0400 | [diff] [blame] | 1484 | static void gfs2_dir_readahead(struct inode *inode, unsigned hsize, u32 index, |
| 1485 | struct file_ra_state *f_ra) |
| 1486 | { |
| 1487 | struct gfs2_inode *ip = GFS2_I(inode); |
| 1488 | struct gfs2_glock *gl = ip->i_gl; |
| 1489 | struct buffer_head *bh; |
| 1490 | u64 blocknr = 0, last; |
| 1491 | unsigned count; |
| 1492 | |
| 1493 | /* First check if we've already read-ahead for the whole range. */ |
Steven Whitehouse | 79c4c37 | 2011-11-09 13:46:06 +0000 | [diff] [blame] | 1494 | if (index + MAX_RA_BLOCKS < f_ra->start) |
Bob Peterson | dfe4d34 | 2011-10-27 12:16:06 -0400 | [diff] [blame] | 1495 | return; |
| 1496 | |
| 1497 | f_ra->start = max((pgoff_t)index, f_ra->start); |
| 1498 | for (count = 0; count < MAX_RA_BLOCKS; count++) { |
| 1499 | if (f_ra->start >= hsize) /* if exceeded the hash table */ |
| 1500 | break; |
| 1501 | |
| 1502 | last = blocknr; |
| 1503 | blocknr = be64_to_cpu(ip->i_hash_cache[f_ra->start]); |
| 1504 | f_ra->start++; |
| 1505 | if (blocknr == last) |
| 1506 | continue; |
| 1507 | |
| 1508 | bh = gfs2_getbuf(gl, blocknr, 1); |
| 1509 | if (trylock_buffer(bh)) { |
| 1510 | if (buffer_uptodate(bh)) { |
| 1511 | unlock_buffer(bh); |
| 1512 | brelse(bh); |
| 1513 | continue; |
| 1514 | } |
| 1515 | bh->b_end_io = end_buffer_read_sync; |
Christoph Hellwig | 7024628 | 2016-07-19 11:28:41 +0200 | [diff] [blame] | 1516 | submit_bh(REQ_OP_READ, REQ_RAHEAD | REQ_META, bh); |
Bob Peterson | dfe4d34 | 2011-10-27 12:16:06 -0400 | [diff] [blame] | 1517 | continue; |
| 1518 | } |
| 1519 | brelse(bh); |
| 1520 | } |
| 1521 | } |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 1522 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1523 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1524 | * dir_e_read - Reads the entries from a directory into a filldir buffer |
| 1525 | * @dip: dinode pointer |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1526 | * @ctx: actor to feed the entries to |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1527 | * |
| 1528 | * Returns: errno |
| 1529 | */ |
| 1530 | |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1531 | static int dir_e_read(struct inode *inode, struct dir_context *ctx, |
| 1532 | struct file_ra_state *f_ra) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1533 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1534 | struct gfs2_inode *dip = GFS2_I(inode); |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1535 | u32 hsize, len = 0; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1536 | u32 hash, index; |
Al Viro | b44b84d | 2006-10-14 10:46:30 -0400 | [diff] [blame] | 1537 | __be64 *lp; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1538 | int copied = 0; |
| 1539 | int error = 0; |
Steven Whitehouse | 4da3c64 | 2006-07-11 13:19:13 -0400 | [diff] [blame] | 1540 | unsigned depth = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1541 | |
Steven Whitehouse | 9a00450 | 2008-02-01 09:23:44 +0000 | [diff] [blame] | 1542 | hsize = 1 << dip->i_depth; |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1543 | hash = gfs2_dir_offset2hash(ctx->pos); |
Steven Whitehouse | 9a00450 | 2008-02-01 09:23:44 +0000 | [diff] [blame] | 1544 | index = hash >> (32 - dip->i_depth); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1545 | |
Steven Whitehouse | 79c4c37 | 2011-11-09 13:46:06 +0000 | [diff] [blame] | 1546 | if (dip->i_hash_cache == NULL) |
Bob Peterson | dfe4d34 | 2011-10-27 12:16:06 -0400 | [diff] [blame] | 1547 | f_ra->start = 0; |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 1548 | lp = gfs2_dir_get_hash_table(dip); |
| 1549 | if (IS_ERR(lp)) |
| 1550 | return PTR_ERR(lp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1551 | |
Bob Peterson | dfe4d34 | 2011-10-27 12:16:06 -0400 | [diff] [blame] | 1552 | gfs2_dir_readahead(inode, hsize, index, f_ra); |
| 1553 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1554 | while (index < hsize) { |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1555 | error = gfs2_dir_read_leaf(inode, ctx, |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1556 | &copied, &depth, |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 1557 | be64_to_cpu(lp[index])); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1558 | if (error) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1559 | break; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1560 | |
Steven Whitehouse | 9a00450 | 2008-02-01 09:23:44 +0000 | [diff] [blame] | 1561 | len = 1 << (dip->i_depth - depth); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1562 | index = (index & ~(len - 1)) + len; |
| 1563 | } |
| 1564 | |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1565 | if (error > 0) |
| 1566 | error = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1567 | return error; |
| 1568 | } |
| 1569 | |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1570 | int gfs2_dir_read(struct inode *inode, struct dir_context *ctx, |
| 1571 | struct file_ra_state *f_ra) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1572 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1573 | struct gfs2_inode *dip = GFS2_I(inode); |
Steven Whitehouse | bdd19a2 | 2007-04-18 09:38:42 +0100 | [diff] [blame] | 1574 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1575 | struct dirent_gather g; |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1576 | struct gfs2_dirent **darr, *dent; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1577 | struct buffer_head *dibh; |
| 1578 | int copied = 0; |
| 1579 | int error; |
| 1580 | |
Steven Whitehouse | ad6203f | 2008-11-03 13:59:19 +0000 | [diff] [blame] | 1581 | if (!dip->i_entries) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1582 | return 0; |
| 1583 | |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 1584 | if (dip->i_diskflags & GFS2_DIF_EXHASH) |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1585 | return dir_e_read(inode, ctx, f_ra); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1586 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1587 | if (!gfs2_is_stuffed(dip)) { |
| 1588 | gfs2_consist_inode(dip); |
| 1589 | return -EIO; |
| 1590 | } |
| 1591 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1592 | error = gfs2_meta_inode_buffer(dip, &dibh); |
| 1593 | if (error) |
| 1594 | return error; |
| 1595 | |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1596 | error = -ENOMEM; |
Steven Whitehouse | bdd19a2 | 2007-04-18 09:38:42 +0100 | [diff] [blame] | 1597 | /* 96 is max number of dirents which can be stuffed into an inode */ |
Josef Bacik | 16c5f06 | 2008-04-09 09:33:41 -0400 | [diff] [blame] | 1598 | darr = kmalloc(96 * sizeof(struct gfs2_dirent *), GFP_NOFS); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1599 | if (darr) { |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1600 | g.pdent = (const struct gfs2_dirent **)darr; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1601 | g.offset = 0; |
| 1602 | dent = gfs2_dirent_scan(inode, dibh->b_data, dibh->b_size, |
| 1603 | gfs2_dirent_gather, NULL, &g); |
| 1604 | if (IS_ERR(dent)) { |
| 1605 | error = PTR_ERR(dent); |
| 1606 | goto out; |
| 1607 | } |
Steven Whitehouse | ad6203f | 2008-11-03 13:59:19 +0000 | [diff] [blame] | 1608 | if (dip->i_entries != g.offset) { |
Steven Whitehouse | bdd19a2 | 2007-04-18 09:38:42 +0100 | [diff] [blame] | 1609 | fs_warn(sdp, "Number of entries corrupt in dir %llu, " |
Steven Whitehouse | ad6203f | 2008-11-03 13:59:19 +0000 | [diff] [blame] | 1610 | "ip->i_entries (%u) != g.offset (%u)\n", |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 1611 | (unsigned long long)dip->i_no_addr, |
Steven Whitehouse | ad6203f | 2008-11-03 13:59:19 +0000 | [diff] [blame] | 1612 | dip->i_entries, |
Steven Whitehouse | bdd19a2 | 2007-04-18 09:38:42 +0100 | [diff] [blame] | 1613 | g.offset); |
| 1614 | error = -EIO; |
| 1615 | goto out; |
| 1616 | } |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1617 | gfs2_set_cookies(sdp, dibh, 0, darr, dip->i_entries); |
Al Viro | d81a8ef | 2013-05-16 14:14:48 -0400 | [diff] [blame] | 1618 | error = do_filldir_main(dip, ctx, darr, |
Benjamin Marzinski | 471f3db | 2015-12-01 08:46:55 -0600 | [diff] [blame] | 1619 | dip->i_entries, 0, &copied); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1620 | out: |
| 1621 | kfree(darr); |
| 1622 | } |
| 1623 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1624 | if (error > 0) |
| 1625 | error = 0; |
| 1626 | |
| 1627 | brelse(dibh); |
| 1628 | |
| 1629 | return error; |
| 1630 | } |
| 1631 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1632 | /** |
| 1633 | * gfs2_dir_search - Search a directory |
Steven Whitehouse | 5a00f3c | 2013-06-11 13:45:29 +0100 | [diff] [blame] | 1634 | * @dip: The GFS2 dir inode |
| 1635 | * @name: The name we are looking up |
| 1636 | * @fail_on_exist: Fail if the name exists rather than looking it up |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1637 | * |
| 1638 | * This routine searches a directory for a file or another directory. |
| 1639 | * Assumes a glock is held on dip. |
| 1640 | * |
| 1641 | * Returns: errno |
| 1642 | */ |
| 1643 | |
Steven Whitehouse | 5a00f3c | 2013-06-11 13:45:29 +0100 | [diff] [blame] | 1644 | struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *name, |
| 1645 | bool fail_on_exist) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1646 | { |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1647 | struct buffer_head *bh; |
| 1648 | struct gfs2_dirent *dent; |
Steven Whitehouse | 5a00f3c | 2013-06-11 13:45:29 +0100 | [diff] [blame] | 1649 | u64 addr, formal_ino; |
| 1650 | u16 dtype; |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 1651 | |
| 1652 | dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh); |
| 1653 | if (dent) { |
Andreas Gruenbacher | c8d5770 | 2015-11-11 15:00:35 -0600 | [diff] [blame] | 1654 | struct inode *inode; |
| 1655 | u16 rahead; |
| 1656 | |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 1657 | if (IS_ERR(dent)) |
David Howells | e231c2e | 2008-02-07 00:15:26 -0800 | [diff] [blame] | 1658 | return ERR_CAST(dent); |
Steven Whitehouse | 5a00f3c | 2013-06-11 13:45:29 +0100 | [diff] [blame] | 1659 | dtype = be16_to_cpu(dent->de_type); |
Andreas Gruenbacher | c8d5770 | 2015-11-11 15:00:35 -0600 | [diff] [blame] | 1660 | rahead = be16_to_cpu(dent->de_rahead); |
Steven Whitehouse | 5a00f3c | 2013-06-11 13:45:29 +0100 | [diff] [blame] | 1661 | addr = be64_to_cpu(dent->de_inum.no_addr); |
| 1662 | formal_ino = be64_to_cpu(dent->de_inum.no_formal_ino); |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 1663 | brelse(bh); |
Steven Whitehouse | 5a00f3c | 2013-06-11 13:45:29 +0100 | [diff] [blame] | 1664 | if (fail_on_exist) |
| 1665 | return ERR_PTR(-EEXIST); |
Andreas Gruenbacher | 3ce37b2 | 2016-06-14 12:22:27 -0500 | [diff] [blame] | 1666 | inode = gfs2_inode_lookup(dir->i_sb, dtype, addr, formal_ino, |
| 1667 | GFS2_BLKST_FREE /* ignore */); |
Andreas Gruenbacher | c8d5770 | 2015-11-11 15:00:35 -0600 | [diff] [blame] | 1668 | if (!IS_ERR(inode)) |
| 1669 | GFS2_I(inode)->i_rahead = rahead; |
| 1670 | return inode; |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 1671 | } |
| 1672 | return ERR_PTR(-ENOENT); |
| 1673 | } |
| 1674 | |
| 1675 | int gfs2_dir_check(struct inode *dir, const struct qstr *name, |
| 1676 | const struct gfs2_inode *ip) |
| 1677 | { |
| 1678 | struct buffer_head *bh; |
| 1679 | struct gfs2_dirent *dent; |
| 1680 | int ret = -ENOENT; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1681 | |
| 1682 | dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh); |
| 1683 | if (dent) { |
| 1684 | if (IS_ERR(dent)) |
| 1685 | return PTR_ERR(dent); |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 1686 | if (ip) { |
| 1687 | if (be64_to_cpu(dent->de_inum.no_addr) != ip->i_no_addr) |
| 1688 | goto out; |
| 1689 | if (be64_to_cpu(dent->de_inum.no_formal_ino) != |
| 1690 | ip->i_no_formal_ino) |
| 1691 | goto out; |
| 1692 | if (unlikely(IF2DT(ip->i_inode.i_mode) != |
| 1693 | be16_to_cpu(dent->de_type))) { |
| 1694 | gfs2_consist_inode(GFS2_I(dir)); |
| 1695 | ret = -EIO; |
| 1696 | goto out; |
| 1697 | } |
| 1698 | } |
| 1699 | ret = 0; |
| 1700 | out: |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1701 | brelse(bh); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1702 | } |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 1703 | return ret; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1704 | } |
| 1705 | |
Steven Whitehouse | 01bcb0d | 2014-01-08 12:14:57 +0000 | [diff] [blame] | 1706 | /** |
| 1707 | * dir_new_leaf - Add a new leaf onto hash chain |
| 1708 | * @inode: The directory |
| 1709 | * @name: The name we are adding |
| 1710 | * |
| 1711 | * This adds a new dir leaf onto an existing leaf when there is not |
| 1712 | * enough space to add a new dir entry. This is a last resort after |
| 1713 | * we've expanded the hash table to max size and also split existing |
| 1714 | * leaf blocks, so it will only occur for very large directories. |
| 1715 | * |
| 1716 | * The dist parameter is set to 1 for leaf blocks directly attached |
| 1717 | * to the hash table, 2 for one layer of indirection, 3 for two layers |
| 1718 | * etc. We are thus able to tell the difference between an old leaf |
| 1719 | * with dist set to zero (i.e. "don't know") and a new one where we |
| 1720 | * set this information for debug/fsck purposes. |
| 1721 | * |
| 1722 | * Returns: 0 on success, or -ve on error |
| 1723 | */ |
| 1724 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1725 | static int dir_new_leaf(struct inode *inode, const struct qstr *name) |
| 1726 | { |
| 1727 | struct buffer_head *bh, *obh; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1728 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1729 | struct gfs2_leaf *leaf, *oleaf; |
Steven Whitehouse | 01bcb0d | 2014-01-08 12:14:57 +0000 | [diff] [blame] | 1730 | u32 dist = 1; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1731 | int error; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1732 | u32 index; |
| 1733 | u64 bn; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1734 | |
Steven Whitehouse | 9a00450 | 2008-02-01 09:23:44 +0000 | [diff] [blame] | 1735 | index = name->hash >> (32 - ip->i_depth); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1736 | error = get_first_leaf(ip, index, &obh); |
| 1737 | if (error) |
| 1738 | return error; |
| 1739 | do { |
Steven Whitehouse | 01bcb0d | 2014-01-08 12:14:57 +0000 | [diff] [blame] | 1740 | dist++; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1741 | oleaf = (struct gfs2_leaf *)obh->b_data; |
| 1742 | bn = be64_to_cpu(oleaf->lf_next); |
| 1743 | if (!bn) |
| 1744 | break; |
| 1745 | brelse(obh); |
| 1746 | error = get_leaf(ip, bn, &obh); |
| 1747 | if (error) |
| 1748 | return error; |
| 1749 | } while(1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1750 | |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 1751 | gfs2_trans_add_meta(ip->i_gl, obh); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1752 | |
| 1753 | leaf = new_leaf(inode, &bh, be16_to_cpu(oleaf->lf_depth)); |
| 1754 | if (!leaf) { |
| 1755 | brelse(obh); |
| 1756 | return -ENOSPC; |
| 1757 | } |
Steven Whitehouse | 01bcb0d | 2014-01-08 12:14:57 +0000 | [diff] [blame] | 1758 | leaf->lf_dist = cpu_to_be32(dist); |
Steven Whitehouse | 4d8012b | 2006-04-12 17:39:45 -0400 | [diff] [blame] | 1759 | oleaf->lf_next = cpu_to_be64(bh->b_blocknr); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1760 | brelse(bh); |
| 1761 | brelse(obh); |
| 1762 | |
| 1763 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 1764 | if (error) |
| 1765 | return error; |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 1766 | gfs2_trans_add_meta(ip->i_gl, bh); |
Steven Whitehouse | 77658aa | 2008-02-12 14:17:27 +0000 | [diff] [blame] | 1767 | gfs2_add_inode_blocks(&ip->i_inode, 1); |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 1768 | gfs2_dinode_out(ip, bh->b_data); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1769 | brelse(bh); |
| 1770 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1771 | } |
| 1772 | |
Steven Whitehouse | 44aaada | 2014-02-07 11:23:22 +0000 | [diff] [blame] | 1773 | static u16 gfs2_inode_ra_len(const struct gfs2_inode *ip) |
| 1774 | { |
| 1775 | u64 where = ip->i_no_addr + 1; |
| 1776 | if (ip->i_eattr == where) |
| 1777 | return 1; |
| 1778 | return 0; |
| 1779 | } |
| 1780 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1781 | /** |
| 1782 | * gfs2_dir_add - Add new filename into directory |
Steven Whitehouse | 2b47dad | 2014-01-06 12:49:43 +0000 | [diff] [blame] | 1783 | * @inode: The directory inode |
| 1784 | * @name: The new name |
| 1785 | * @nip: The GFS2 inode to be linked in to the directory |
| 1786 | * @da: The directory addition info |
| 1787 | * |
| 1788 | * If the call to gfs2_diradd_alloc_required resulted in there being |
| 1789 | * no need to allocate any new directory blocks, then it will contain |
| 1790 | * a pointer to the directory entry and the bh in which it resides. We |
| 1791 | * can use that without having to repeat the search. If there was no |
| 1792 | * free space, then we must now create more space. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1793 | * |
| 1794 | * Returns: 0 on success, error code on failure |
| 1795 | */ |
| 1796 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1797 | int gfs2_dir_add(struct inode *inode, const struct qstr *name, |
Steven Whitehouse | 2b47dad | 2014-01-06 12:49:43 +0000 | [diff] [blame] | 1798 | const struct gfs2_inode *nip, struct gfs2_diradd *da) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1799 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1800 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | 2b47dad | 2014-01-06 12:49:43 +0000 | [diff] [blame] | 1801 | struct buffer_head *bh = da->bh; |
| 1802 | struct gfs2_dirent *dent = da->dent; |
Steven Whitehouse | 01bcb0d | 2014-01-08 12:14:57 +0000 | [diff] [blame] | 1803 | struct timespec tv; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1804 | struct gfs2_leaf *leaf; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1805 | int error; |
| 1806 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1807 | while(1) { |
Steven Whitehouse | 2b47dad | 2014-01-06 12:49:43 +0000 | [diff] [blame] | 1808 | if (da->bh == NULL) { |
| 1809 | dent = gfs2_dirent_search(inode, name, |
| 1810 | gfs2_dirent_find_space, &bh); |
| 1811 | } |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1812 | if (dent) { |
| 1813 | if (IS_ERR(dent)) |
| 1814 | return PTR_ERR(dent); |
| 1815 | dent = gfs2_init_dirent(inode, dent, name, bh); |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 1816 | gfs2_inum_out(nip, dent); |
Steven Whitehouse | 3d6ecb7 | 2011-05-09 13:30:08 +0100 | [diff] [blame] | 1817 | dent->de_type = cpu_to_be16(IF2DT(nip->i_inode.i_mode)); |
Steven Whitehouse | 44aaada | 2014-02-07 11:23:22 +0000 | [diff] [blame] | 1818 | dent->de_rahead = cpu_to_be16(gfs2_inode_ra_len(nip)); |
Steven Whitehouse | 01bcb0d | 2014-01-08 12:14:57 +0000 | [diff] [blame] | 1819 | tv = CURRENT_TIME; |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 1820 | if (ip->i_diskflags & GFS2_DIF_EXHASH) { |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1821 | leaf = (struct gfs2_leaf *)bh->b_data; |
Marcin Slusarz | bb16b34 | 2008-02-13 00:06:10 +0100 | [diff] [blame] | 1822 | be16_add_cpu(&leaf->lf_entries, 1); |
Steven Whitehouse | 01bcb0d | 2014-01-08 12:14:57 +0000 | [diff] [blame] | 1823 | leaf->lf_nsec = cpu_to_be32(tv.tv_nsec); |
| 1824 | leaf->lf_sec = cpu_to_be64(tv.tv_sec); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1825 | } |
Steven Whitehouse | 2b47dad | 2014-01-06 12:49:43 +0000 | [diff] [blame] | 1826 | da->dent = NULL; |
| 1827 | da->bh = NULL; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1828 | brelse(bh); |
Steven Whitehouse | ad6203f | 2008-11-03 13:59:19 +0000 | [diff] [blame] | 1829 | ip->i_entries++; |
Steven Whitehouse | 01bcb0d | 2014-01-08 12:14:57 +0000 | [diff] [blame] | 1830 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = tv; |
Steven Whitehouse | 3d6ecb7 | 2011-05-09 13:30:08 +0100 | [diff] [blame] | 1831 | if (S_ISDIR(nip->i_inode.i_mode)) |
| 1832 | inc_nlink(&ip->i_inode); |
Bob Peterson | 343cd8f | 2012-11-12 13:04:54 -0500 | [diff] [blame] | 1833 | mark_inode_dirty(inode); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1834 | error = 0; |
| 1835 | break; |
| 1836 | } |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 1837 | if (!(ip->i_diskflags & GFS2_DIF_EXHASH)) { |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1838 | error = dir_make_exhash(inode); |
| 1839 | if (error) |
| 1840 | break; |
| 1841 | continue; |
| 1842 | } |
| 1843 | error = dir_split_leaf(inode, name); |
| 1844 | if (error == 0) |
| 1845 | continue; |
Steven Whitehouse | e90deff | 2006-03-29 19:02:15 -0500 | [diff] [blame] | 1846 | if (error < 0) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1847 | break; |
Steven Whitehouse | 9a00450 | 2008-02-01 09:23:44 +0000 | [diff] [blame] | 1848 | if (ip->i_depth < GFS2_DIR_MAX_DEPTH) { |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1849 | error = dir_double_exhash(ip); |
| 1850 | if (error) |
| 1851 | break; |
| 1852 | error = dir_split_leaf(inode, name); |
Steven Whitehouse | e90deff | 2006-03-29 19:02:15 -0500 | [diff] [blame] | 1853 | if (error < 0) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1854 | break; |
Steven Whitehouse | e90deff | 2006-03-29 19:02:15 -0500 | [diff] [blame] | 1855 | if (error == 0) |
| 1856 | continue; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1857 | } |
| 1858 | error = dir_new_leaf(inode, name); |
| 1859 | if (!error) |
| 1860 | continue; |
| 1861 | error = -ENOSPC; |
| 1862 | break; |
| 1863 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1864 | return error; |
| 1865 | } |
| 1866 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1867 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1868 | /** |
| 1869 | * gfs2_dir_del - Delete a directory entry |
| 1870 | * @dip: The GFS2 inode |
| 1871 | * @filename: The filename |
| 1872 | * |
| 1873 | * Returns: 0 on success, error code on failure |
| 1874 | */ |
| 1875 | |
Steven Whitehouse | 855d23c | 2011-05-09 16:42:37 +0100 | [diff] [blame] | 1876 | int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1877 | { |
Steven Whitehouse | 855d23c | 2011-05-09 16:42:37 +0100 | [diff] [blame] | 1878 | const struct qstr *name = &dentry->d_name; |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1879 | struct gfs2_dirent *dent, *prev = NULL; |
| 1880 | struct buffer_head *bh; |
Steven Whitehouse | 01bcb0d | 2014-01-08 12:14:57 +0000 | [diff] [blame] | 1881 | struct timespec tv = CURRENT_TIME; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1882 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1883 | /* Returns _either_ the entry (if its first in block) or the |
| 1884 | previous entry otherwise */ |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1885 | dent = gfs2_dirent_search(&dip->i_inode, name, gfs2_dirent_prev, &bh); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1886 | if (!dent) { |
| 1887 | gfs2_consist_inode(dip); |
| 1888 | return -EIO; |
| 1889 | } |
| 1890 | if (IS_ERR(dent)) { |
| 1891 | gfs2_consist_inode(dip); |
| 1892 | return PTR_ERR(dent); |
| 1893 | } |
| 1894 | /* If not first in block, adjust pointers accordingly */ |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 1895 | if (gfs2_dirent_find(dent, name, NULL) == 0) { |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1896 | prev = dent; |
| 1897 | dent = (struct gfs2_dirent *)((char *)dent + be16_to_cpu(prev->de_rec_len)); |
| 1898 | } |
| 1899 | |
| 1900 | dirent_del(dip, bh, prev, dent); |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 1901 | if (dip->i_diskflags & GFS2_DIF_EXHASH) { |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1902 | struct gfs2_leaf *leaf = (struct gfs2_leaf *)bh->b_data; |
| 1903 | u16 entries = be16_to_cpu(leaf->lf_entries); |
| 1904 | if (!entries) |
| 1905 | gfs2_consist_inode(dip); |
| 1906 | leaf->lf_entries = cpu_to_be16(--entries); |
Steven Whitehouse | 01bcb0d | 2014-01-08 12:14:57 +0000 | [diff] [blame] | 1907 | leaf->lf_nsec = cpu_to_be32(tv.tv_nsec); |
| 1908 | leaf->lf_sec = cpu_to_be64(tv.tv_sec); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1909 | } |
Steven Whitehouse | ed38650 | 2006-04-07 16:28:07 -0400 | [diff] [blame] | 1910 | brelse(bh); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1911 | |
Steven Whitehouse | ad6203f | 2008-11-03 13:59:19 +0000 | [diff] [blame] | 1912 | if (!dip->i_entries) |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1913 | gfs2_consist_inode(dip); |
Steven Whitehouse | ad6203f | 2008-11-03 13:59:19 +0000 | [diff] [blame] | 1914 | dip->i_entries--; |
Steven Whitehouse | 01bcb0d | 2014-01-08 12:14:57 +0000 | [diff] [blame] | 1915 | dip->i_inode.i_mtime = dip->i_inode.i_ctime = tv; |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 1916 | if (d_is_dir(dentry)) |
Steven Whitehouse | 855d23c | 2011-05-09 16:42:37 +0100 | [diff] [blame] | 1917 | drop_nlink(&dip->i_inode); |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1918 | mark_inode_dirty(&dip->i_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1919 | |
Steven Whitehouse | ab9bbda | 2011-08-15 14:20:36 +0100 | [diff] [blame] | 1920 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1921 | } |
| 1922 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1923 | /** |
| 1924 | * gfs2_dir_mvino - Change inode number of directory entry |
| 1925 | * @dip: The GFS2 inode |
| 1926 | * @filename: |
| 1927 | * @new_inode: |
| 1928 | * |
| 1929 | * This routine changes the inode number of a directory entry. It's used |
| 1930 | * by rename to change ".." when a directory is moved. |
| 1931 | * Assumes a glock is held on dvp. |
| 1932 | * |
| 1933 | * Returns: errno |
| 1934 | */ |
| 1935 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1936 | int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename, |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 1937 | const struct gfs2_inode *nip, unsigned int new_type) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1938 | { |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1939 | struct buffer_head *bh; |
| 1940 | struct gfs2_dirent *dent; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1941 | int error; |
| 1942 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1943 | dent = gfs2_dirent_search(&dip->i_inode, filename, gfs2_dirent_find, &bh); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1944 | if (!dent) { |
| 1945 | gfs2_consist_inode(dip); |
| 1946 | return -EIO; |
| 1947 | } |
| 1948 | if (IS_ERR(dent)) |
| 1949 | return PTR_ERR(dent); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1950 | |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 1951 | gfs2_trans_add_meta(dip->i_gl, bh); |
Steven Whitehouse | dbb7cae | 2007-05-15 15:37:50 +0100 | [diff] [blame] | 1952 | gfs2_inum_out(nip, dent); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1953 | dent->de_type = cpu_to_be16(new_type); |
| 1954 | |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 1955 | if (dip->i_diskflags & GFS2_DIF_EXHASH) { |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1956 | brelse(bh); |
| 1957 | error = gfs2_meta_inode_buffer(dip, &bh); |
| 1958 | if (error) |
| 1959 | return error; |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 1960 | gfs2_trans_add_meta(dip->i_gl, bh); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1961 | } |
| 1962 | |
Steven Whitehouse | 4bd91ba | 2007-06-05 09:39:18 +0100 | [diff] [blame] | 1963 | dip->i_inode.i_mtime = dip->i_inode.i_ctime = CURRENT_TIME; |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 1964 | gfs2_dinode_out(dip, bh->b_data); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1965 | brelse(bh); |
| 1966 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1967 | } |
| 1968 | |
| 1969 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1970 | * leaf_dealloc - Deallocate a directory leaf |
| 1971 | * @dip: the directory |
| 1972 | * @index: the hash table offset in the directory |
| 1973 | * @len: the number of pointers to this leaf |
| 1974 | * @leaf_no: the leaf number |
Bob Peterson | ec038c8 | 2011-03-22 13:55:23 -0400 | [diff] [blame] | 1975 | * @leaf_bh: buffer_head for the starting leaf |
Bob Peterson | d24a7a4 | 2011-03-22 13:54:03 -0400 | [diff] [blame] | 1976 | * last_dealloc: 1 if this is the final dealloc for the leaf, else 0 |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1977 | * |
| 1978 | * Returns: errno |
| 1979 | */ |
| 1980 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1981 | static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len, |
Bob Peterson | ec038c8 | 2011-03-22 13:55:23 -0400 | [diff] [blame] | 1982 | u64 leaf_no, struct buffer_head *leaf_bh, |
| 1983 | int last_dealloc) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1984 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1985 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 1986 | struct gfs2_leaf *tmp_leaf; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1987 | struct gfs2_rgrp_list rlist; |
| 1988 | struct buffer_head *bh, *dibh; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1989 | u64 blk, nblk; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1990 | unsigned int rg_blocks = 0, l_blocks = 0; |
| 1991 | char *ht; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 1992 | unsigned int x, size = len * sizeof(u64); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1993 | int error; |
| 1994 | |
Bob Peterson | 5e2f7d6 | 2012-04-04 22:11:16 -0400 | [diff] [blame] | 1995 | error = gfs2_rindex_update(sdp); |
| 1996 | if (error) |
| 1997 | return error; |
| 1998 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1999 | memset(&rlist, 0, sizeof(struct gfs2_rgrp_list)); |
| 2000 | |
Joe Perches | 8be04b9 | 2013-06-19 12:15:53 -0700 | [diff] [blame] | 2001 | ht = kzalloc(size, GFP_NOFS | __GFP_NOWARN); |
Bob Peterson | e8830d8 | 2013-05-30 09:48:56 -0400 | [diff] [blame] | 2002 | if (ht == NULL) |
Oleg Drokin | 7456a37 | 2015-02-01 22:59:54 -0500 | [diff] [blame] | 2003 | ht = __vmalloc(size, GFP_NOFS | __GFP_NOWARN | __GFP_ZERO, |
| 2004 | PAGE_KERNEL); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2005 | if (!ht) |
| 2006 | return -ENOMEM; |
| 2007 | |
Eric W. Biederman | f4108a6 | 2013-01-31 17:49:26 -0800 | [diff] [blame] | 2008 | error = gfs2_quota_hold(dip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2009 | if (error) |
Bob Peterson | 5407e24 | 2012-05-18 09:28:23 -0400 | [diff] [blame] | 2010 | goto out; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2011 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2012 | /* Count the number of leaves */ |
Bob Peterson | ec038c8 | 2011-03-22 13:55:23 -0400 | [diff] [blame] | 2013 | bh = leaf_bh; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2014 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 2015 | for (blk = leaf_no; blk; blk = nblk) { |
Bob Peterson | ec038c8 | 2011-03-22 13:55:23 -0400 | [diff] [blame] | 2016 | if (blk != leaf_no) { |
| 2017 | error = get_leaf(dip, blk, &bh); |
| 2018 | if (error) |
| 2019 | goto out_rlist; |
| 2020 | } |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 2021 | tmp_leaf = (struct gfs2_leaf *)bh->b_data; |
| 2022 | nblk = be64_to_cpu(tmp_leaf->lf_next); |
Bob Peterson | ec038c8 | 2011-03-22 13:55:23 -0400 | [diff] [blame] | 2023 | if (blk != leaf_no) |
| 2024 | brelse(bh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2025 | |
Steven Whitehouse | 70b0c36 | 2011-09-02 16:08:09 +0100 | [diff] [blame] | 2026 | gfs2_rlist_add(dip, &rlist, blk); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2027 | l_blocks++; |
| 2028 | } |
| 2029 | |
Bob Peterson | fe6c991 | 2008-01-28 11:13:02 -0600 | [diff] [blame] | 2030 | gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2031 | |
| 2032 | for (x = 0; x < rlist.rl_rgrps; x++) { |
| 2033 | struct gfs2_rgrpd *rgd; |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 2034 | rgd = rlist.rl_ghs[x].gh_gl->gl_object; |
Steven Whitehouse | bb8d8a6 | 2007-06-01 14:11:58 +0100 | [diff] [blame] | 2035 | rg_blocks += rgd->rd_length; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2036 | } |
| 2037 | |
| 2038 | error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs); |
| 2039 | if (error) |
| 2040 | goto out_rlist; |
| 2041 | |
| 2042 | error = gfs2_trans_begin(sdp, |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 2043 | rg_blocks + (DIV_ROUND_UP(size, sdp->sd_jbsize) + 1) + |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2044 | RES_DINODE + RES_STATFS + RES_QUOTA, l_blocks); |
| 2045 | if (error) |
| 2046 | goto out_rg_gunlock; |
| 2047 | |
Bob Peterson | ec038c8 | 2011-03-22 13:55:23 -0400 | [diff] [blame] | 2048 | bh = leaf_bh; |
| 2049 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 2050 | for (blk = leaf_no; blk; blk = nblk) { |
Bob Peterson | ec038c8 | 2011-03-22 13:55:23 -0400 | [diff] [blame] | 2051 | if (blk != leaf_no) { |
| 2052 | error = get_leaf(dip, blk, &bh); |
| 2053 | if (error) |
| 2054 | goto out_end_trans; |
| 2055 | } |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 2056 | tmp_leaf = (struct gfs2_leaf *)bh->b_data; |
| 2057 | nblk = be64_to_cpu(tmp_leaf->lf_next); |
Bob Peterson | ec038c8 | 2011-03-22 13:55:23 -0400 | [diff] [blame] | 2058 | if (blk != leaf_no) |
| 2059 | brelse(bh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2060 | |
| 2061 | gfs2_free_meta(dip, blk, 1); |
Steven Whitehouse | 77658aa | 2008-02-12 14:17:27 +0000 | [diff] [blame] | 2062 | gfs2_add_inode_blocks(&dip->i_inode, -1); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2063 | } |
| 2064 | |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 2065 | error = gfs2_dir_write_data(dip, ht, index * sizeof(u64), size); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2066 | if (error != size) { |
| 2067 | if (error >= 0) |
| 2068 | error = -EIO; |
| 2069 | goto out_end_trans; |
| 2070 | } |
| 2071 | |
| 2072 | error = gfs2_meta_inode_buffer(dip, &dibh); |
| 2073 | if (error) |
| 2074 | goto out_end_trans; |
| 2075 | |
Steven Whitehouse | 350a9b0 | 2012-12-14 12:36:02 +0000 | [diff] [blame] | 2076 | gfs2_trans_add_meta(dip->i_gl, dibh); |
Bob Peterson | d24a7a4 | 2011-03-22 13:54:03 -0400 | [diff] [blame] | 2077 | /* On the last dealloc, make this a regular file in case we crash. |
| 2078 | (We don't want to free these blocks a second time.) */ |
| 2079 | if (last_dealloc) |
| 2080 | dip->i_inode.i_mode = S_IFREG; |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 2081 | gfs2_dinode_out(dip, dibh->b_data); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2082 | brelse(dibh); |
| 2083 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 2084 | out_end_trans: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2085 | gfs2_trans_end(sdp); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 2086 | out_rg_gunlock: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2087 | gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs); |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 2088 | out_rlist: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2089 | gfs2_rlist_free(&rlist); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2090 | gfs2_quota_unhold(dip); |
Cyrill Gorcunov | 182fe5a | 2008-03-03 21:54:21 +0300 | [diff] [blame] | 2091 | out: |
Al Viro | 3cdcf63 | 2014-11-20 05:18:38 +0000 | [diff] [blame] | 2092 | kvfree(ht); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2093 | return error; |
| 2094 | } |
| 2095 | |
| 2096 | /** |
| 2097 | * gfs2_dir_exhash_dealloc - free all the leaf blocks in a directory |
| 2098 | * @dip: the directory |
| 2099 | * |
| 2100 | * Dealloc all on-disk directory leaves to FREEMETA state |
| 2101 | * Change on-disk inode type to "regular file" |
| 2102 | * |
| 2103 | * Returns: errno |
| 2104 | */ |
| 2105 | |
| 2106 | int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip) |
| 2107 | { |
Bob Peterson | 556bb17 | 2011-03-22 13:56:37 -0400 | [diff] [blame] | 2108 | struct buffer_head *bh; |
| 2109 | struct gfs2_leaf *leaf; |
| 2110 | u32 hsize, len; |
Bob Peterson | 556bb17 | 2011-03-22 13:56:37 -0400 | [diff] [blame] | 2111 | u32 index = 0, next_index; |
| 2112 | __be64 *lp; |
| 2113 | u64 leaf_no; |
| 2114 | int error = 0, last; |
| 2115 | |
| 2116 | hsize = 1 << dip->i_depth; |
Bob Peterson | 556bb17 | 2011-03-22 13:56:37 -0400 | [diff] [blame] | 2117 | |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 2118 | lp = gfs2_dir_get_hash_table(dip); |
| 2119 | if (IS_ERR(lp)) |
| 2120 | return PTR_ERR(lp); |
Bob Peterson | 556bb17 | 2011-03-22 13:56:37 -0400 | [diff] [blame] | 2121 | |
| 2122 | while (index < hsize) { |
Steven Whitehouse | 17d539f | 2011-06-15 10:29:37 +0100 | [diff] [blame] | 2123 | leaf_no = be64_to_cpu(lp[index]); |
Bob Peterson | 556bb17 | 2011-03-22 13:56:37 -0400 | [diff] [blame] | 2124 | if (leaf_no) { |
| 2125 | error = get_leaf(dip, leaf_no, &bh); |
| 2126 | if (error) |
| 2127 | goto out; |
| 2128 | leaf = (struct gfs2_leaf *)bh->b_data; |
| 2129 | len = 1 << (dip->i_depth - be16_to_cpu(leaf->lf_depth)); |
| 2130 | |
| 2131 | next_index = (index & ~(len - 1)) + len; |
| 2132 | last = ((next_index >= hsize) ? 1 : 0); |
| 2133 | error = leaf_dealloc(dip, index, len, leaf_no, bh, |
| 2134 | last); |
| 2135 | brelse(bh); |
| 2136 | if (error) |
| 2137 | goto out; |
| 2138 | index = next_index; |
| 2139 | } else |
| 2140 | index++; |
| 2141 | } |
| 2142 | |
| 2143 | if (index != hsize) { |
| 2144 | gfs2_consist_inode(dip); |
| 2145 | error = -EIO; |
| 2146 | } |
| 2147 | |
| 2148 | out: |
Bob Peterson | 556bb17 | 2011-03-22 13:56:37 -0400 | [diff] [blame] | 2149 | |
| 2150 | return error; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2151 | } |
| 2152 | |
| 2153 | /** |
| 2154 | * gfs2_diradd_alloc_required - find if adding entry will require an allocation |
| 2155 | * @ip: the file being written to |
| 2156 | * @filname: the filename that's going to be added |
Steven Whitehouse | 3c1c0ae | 2014-01-06 11:28:41 +0000 | [diff] [blame] | 2157 | * @da: The structure to return dir alloc info |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2158 | * |
Steven Whitehouse | 3c1c0ae | 2014-01-06 11:28:41 +0000 | [diff] [blame] | 2159 | * Returns: 0 if ok, -ve on error |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2160 | */ |
| 2161 | |
Steven Whitehouse | 3c1c0ae | 2014-01-06 11:28:41 +0000 | [diff] [blame] | 2162 | int gfs2_diradd_alloc_required(struct inode *inode, const struct qstr *name, |
| 2163 | struct gfs2_diradd *da) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2164 | { |
Steven Whitehouse | 22b5a6c | 2014-01-08 11:05:29 +0000 | [diff] [blame] | 2165 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | 3c1c0ae | 2014-01-06 11:28:41 +0000 | [diff] [blame] | 2166 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | 22b5a6c | 2014-01-08 11:05:29 +0000 | [diff] [blame] | 2167 | const unsigned int extra = sizeof(struct gfs2_dinode) - sizeof(struct gfs2_leaf); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 2168 | struct gfs2_dirent *dent; |
| 2169 | struct buffer_head *bh; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2170 | |
Steven Whitehouse | 3c1c0ae | 2014-01-06 11:28:41 +0000 | [diff] [blame] | 2171 | da->nr_blocks = 0; |
Steven Whitehouse | 2b47dad | 2014-01-06 12:49:43 +0000 | [diff] [blame] | 2172 | da->bh = NULL; |
| 2173 | da->dent = NULL; |
Steven Whitehouse | 3c1c0ae | 2014-01-06 11:28:41 +0000 | [diff] [blame] | 2174 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 2175 | dent = gfs2_dirent_search(inode, name, gfs2_dirent_find_space, &bh); |
Steven Whitehouse | ed38650 | 2006-04-07 16:28:07 -0400 | [diff] [blame] | 2176 | if (!dent) { |
Steven Whitehouse | 3c1c0ae | 2014-01-06 11:28:41 +0000 | [diff] [blame] | 2177 | da->nr_blocks = sdp->sd_max_dirres; |
Steven Whitehouse | 22b5a6c | 2014-01-08 11:05:29 +0000 | [diff] [blame] | 2178 | if (!(ip->i_diskflags & GFS2_DIF_EXHASH) && |
| 2179 | (GFS2_DIRENT_SIZE(name->len) < extra)) |
| 2180 | da->nr_blocks = 1; |
Steven Whitehouse | 3c1c0ae | 2014-01-06 11:28:41 +0000 | [diff] [blame] | 2181 | return 0; |
Steven Whitehouse | ed38650 | 2006-04-07 16:28:07 -0400 | [diff] [blame] | 2182 | } |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 2183 | if (IS_ERR(dent)) |
| 2184 | return PTR_ERR(dent); |
Bob Peterson | 19aeb5a | 2014-09-29 08:52:04 -0400 | [diff] [blame] | 2185 | |
| 2186 | if (da->save_loc) { |
| 2187 | da->bh = bh; |
| 2188 | da->dent = dent; |
| 2189 | } else { |
| 2190 | brelse(bh); |
| 2191 | } |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 2192 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 2193 | } |
| 2194 | |