Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 3 | * Copyright (c) 2013 Red Hat, Inc. |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 4 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * published by the Free Software Foundation. |
| 9 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 10 | * This program is distributed in the hope that it would be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include "xfs.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 20 | #include "xfs_fs.h" |
Dave Chinner | a4fbe6a | 2013-10-23 10:51:50 +1100 | [diff] [blame] | 21 | #include "xfs_format.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 22 | #include "xfs_log_format.h" |
| 23 | #include "xfs_trans_resv.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include "xfs_sb.h" |
David Chinner | da353b0 | 2007-08-28 14:00:13 +1000 | [diff] [blame] | 25 | #include "xfs_ag.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include "xfs_mount.h" |
Dave Chinner | 5706278 | 2013-10-15 09:17:51 +1100 | [diff] [blame] | 27 | #include "xfs_da_format.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 28 | #include "xfs_da_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include "xfs_inode.h" |
Dave Chinner | 2b9ab5a | 2013-08-12 20:49:37 +1000 | [diff] [blame] | 30 | #include "xfs_dir2.h" |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 31 | #include "xfs_dir2_priv.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include "xfs_error.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 33 | #include "xfs_trans.h" |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 34 | #include "xfs_buf_item.h" |
| 35 | #include "xfs_cksum.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | /* |
| 38 | * Check the consistency of the data block. |
| 39 | * The input can also be a block-format directory. |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 40 | * Return 0 is the buffer is good, otherwise an error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | */ |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 42 | int |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 43 | __xfs_dir3_data_check( |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 44 | struct xfs_inode *dp, /* incore inode pointer */ |
| 45 | struct xfs_buf *bp) /* data block's buffer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | { |
| 47 | xfs_dir2_dataptr_t addr; /* addr for leaf lookup */ |
| 48 | xfs_dir2_data_free_t *bf; /* bestfree table */ |
| 49 | xfs_dir2_block_tail_t *btp=NULL; /* block tail */ |
| 50 | int count; /* count of entries found */ |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 51 | xfs_dir2_data_hdr_t *hdr; /* data block header */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | xfs_dir2_data_entry_t *dep; /* data entry */ |
| 53 | xfs_dir2_data_free_t *dfp; /* bestfree entry */ |
| 54 | xfs_dir2_data_unused_t *dup; /* unused entry */ |
| 55 | char *endp; /* end of useful data */ |
| 56 | int freeseen; /* mask of bestfrees seen */ |
| 57 | xfs_dahash_t hash; /* hash of current name */ |
| 58 | int i; /* leaf index */ |
| 59 | int lastfree; /* last entry was unused */ |
| 60 | xfs_dir2_leaf_entry_t *lep=NULL; /* block leaf entries */ |
| 61 | xfs_mount_t *mp; /* filesystem mount point */ |
| 62 | char *p; /* current data position */ |
| 63 | int stale; /* count of stale leaves */ |
Barry Naujok | 5163f95 | 2008-05-21 16:41:01 +1000 | [diff] [blame] | 64 | struct xfs_name name; |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 65 | const struct xfs_dir_ops *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 67 | mp = bp->b_target->bt_mount; |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 68 | |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 69 | /* |
Dave Chinner | 4141956 | 2013-10-29 22:11:50 +1100 | [diff] [blame] | 70 | * We can be passed a null dp here from a verifier, so we need to go the |
| 71 | * hard way to get them. |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 72 | */ |
Dave Chinner | 4141956 | 2013-10-29 22:11:50 +1100 | [diff] [blame] | 73 | ops = xfs_dir_get_ops(mp, dp); |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 74 | |
Dave Chinner | a629362 | 2013-10-29 22:11:56 +1100 | [diff] [blame^] | 75 | hdr = bp->b_addr; |
| 76 | p = (char *)ops->data_entry_p(hdr); |
| 77 | |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 78 | switch (hdr->magic) { |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 79 | case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC): |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 80 | case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC): |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 81 | btp = xfs_dir2_block_tail_p(mp, hdr); |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 82 | lep = xfs_dir2_block_leaf_p(btp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | endp = (char *)lep; |
Dave Chinner | a629362 | 2013-10-29 22:11:56 +1100 | [diff] [blame^] | 84 | |
| 85 | /* |
| 86 | * The number of leaf entries is limited by the size of the |
| 87 | * block and the amount of space used by the data entries. |
| 88 | * We don't know how much space is used by the data entries yet, |
| 89 | * so just ensure that the count falls somewhere inside the |
| 90 | * block right now. |
| 91 | */ |
| 92 | XFS_WANT_CORRUPTED_RETURN(be32_to_cpu(btp->count) < |
| 93 | ((char *)btp - p) / sizeof(struct xfs_dir2_leaf_entry)); |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 94 | break; |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 95 | case cpu_to_be32(XFS_DIR3_DATA_MAGIC): |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 96 | case cpu_to_be32(XFS_DIR2_DATA_MAGIC): |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 97 | endp = (char *)hdr + mp->m_dirblksize; |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 98 | break; |
| 99 | default: |
| 100 | XFS_ERROR_REPORT("Bad Magic", XFS_ERRLEVEL_LOW, mp); |
| 101 | return EFSCORRUPTED; |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 102 | } |
| 103 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | /* |
| 105 | * Account for zero bestfree entries. |
| 106 | */ |
Dave Chinner | a629362 | 2013-10-29 22:11:56 +1100 | [diff] [blame^] | 107 | bf = ops->data_bestfree_p(hdr); |
| 108 | count = lastfree = freeseen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | if (!bf[0].length) { |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 110 | XFS_WANT_CORRUPTED_RETURN(!bf[0].offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | freeseen |= 1 << 0; |
| 112 | } |
| 113 | if (!bf[1].length) { |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 114 | XFS_WANT_CORRUPTED_RETURN(!bf[1].offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | freeseen |= 1 << 1; |
| 116 | } |
| 117 | if (!bf[2].length) { |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 118 | XFS_WANT_CORRUPTED_RETURN(!bf[2].offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | freeseen |= 1 << 2; |
| 120 | } |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 121 | |
| 122 | XFS_WANT_CORRUPTED_RETURN(be16_to_cpu(bf[0].length) >= |
| 123 | be16_to_cpu(bf[1].length)); |
| 124 | XFS_WANT_CORRUPTED_RETURN(be16_to_cpu(bf[1].length) >= |
| 125 | be16_to_cpu(bf[2].length)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | /* |
| 127 | * Loop over the data/unused entries. |
| 128 | */ |
| 129 | while (p < endp) { |
| 130 | dup = (xfs_dir2_data_unused_t *)p; |
| 131 | /* |
| 132 | * If it's unused, look for the space in the bestfree table. |
| 133 | * If we find it, account for that, else make sure it |
| 134 | * doesn't need to be there. |
| 135 | */ |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 136 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 137 | XFS_WANT_CORRUPTED_RETURN(lastfree == 0); |
| 138 | XFS_WANT_CORRUPTED_RETURN( |
| 139 | be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)) == |
| 140 | (char *)dup - (char *)hdr); |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 141 | dfp = xfs_dir2_data_freefind(hdr, bf, dup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | if (dfp) { |
| 143 | i = (int)(dfp - bf); |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 144 | XFS_WANT_CORRUPTED_RETURN( |
| 145 | (freeseen & (1 << i)) == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | freeseen |= 1 << i; |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 147 | } else { |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 148 | XFS_WANT_CORRUPTED_RETURN( |
| 149 | be16_to_cpu(dup->length) <= |
| 150 | be16_to_cpu(bf[2].length)); |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 151 | } |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 152 | p += be16_to_cpu(dup->length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | lastfree = 1; |
| 154 | continue; |
| 155 | } |
| 156 | /* |
| 157 | * It's a real entry. Validate the fields. |
| 158 | * If this is a block directory then make sure it's |
| 159 | * in the leaf section of the block. |
| 160 | * The linear search is crude but this is DEBUG code. |
| 161 | */ |
| 162 | dep = (xfs_dir2_data_entry_t *)p; |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 163 | XFS_WANT_CORRUPTED_RETURN(dep->namelen != 0); |
| 164 | XFS_WANT_CORRUPTED_RETURN( |
| 165 | !xfs_dir_ino_validate(mp, be64_to_cpu(dep->inumber))); |
| 166 | XFS_WANT_CORRUPTED_RETURN( |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 167 | be16_to_cpu(*ops->data_entry_tag_p(dep)) == |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 168 | (char *)dep - (char *)hdr); |
Dave Chinner | 1c55cec | 2013-08-12 20:50:10 +1000 | [diff] [blame] | 169 | XFS_WANT_CORRUPTED_RETURN( |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 170 | ops->data_get_ftype(dep) < XFS_DIR3_FT_MAX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | count++; |
| 172 | lastfree = 0; |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 173 | if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || |
| 174 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) { |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 175 | addr = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | (xfs_dir2_data_aoff_t) |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 177 | ((char *)dep - (char *)hdr)); |
Barry Naujok | 5163f95 | 2008-05-21 16:41:01 +1000 | [diff] [blame] | 178 | name.name = dep->name; |
| 179 | name.len = dep->namelen; |
| 180 | hash = mp->m_dirnameops->hashname(&name); |
Nathan Scott | e922fff | 2006-03-17 17:27:56 +1100 | [diff] [blame] | 181 | for (i = 0; i < be32_to_cpu(btp->count); i++) { |
Nathan Scott | 3c1f9c1 | 2006-03-17 17:28:18 +1100 | [diff] [blame] | 182 | if (be32_to_cpu(lep[i].address) == addr && |
| 183 | be32_to_cpu(lep[i].hashval) == hash) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | break; |
| 185 | } |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 186 | XFS_WANT_CORRUPTED_RETURN(i < be32_to_cpu(btp->count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 188 | p += ops->data_entsize(dep->namelen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | /* |
| 191 | * Need to have seen all the entries and all the bestfree slots. |
| 192 | */ |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 193 | XFS_WANT_CORRUPTED_RETURN(freeseen == 7); |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 194 | if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || |
| 195 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) { |
Nathan Scott | e922fff | 2006-03-17 17:27:56 +1100 | [diff] [blame] | 196 | for (i = stale = 0; i < be32_to_cpu(btp->count); i++) { |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 197 | if (lep[i].address == |
| 198 | cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | stale++; |
| 200 | if (i > 0) |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 201 | XFS_WANT_CORRUPTED_RETURN( |
| 202 | be32_to_cpu(lep[i].hashval) >= |
| 203 | be32_to_cpu(lep[i - 1].hashval)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | } |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 205 | XFS_WANT_CORRUPTED_RETURN(count == |
| 206 | be32_to_cpu(btp->count) - be32_to_cpu(btp->stale)); |
| 207 | XFS_WANT_CORRUPTED_RETURN(stale == be32_to_cpu(btp->stale)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | } |
Dave Chinner | 82025d7 | 2012-11-12 22:54:12 +1100 | [diff] [blame] | 209 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 212 | static bool |
| 213 | xfs_dir3_data_verify( |
Dave Chinner | e481357 | 2012-11-12 22:54:14 +1100 | [diff] [blame] | 214 | struct xfs_buf *bp) |
| 215 | { |
| 216 | struct xfs_mount *mp = bp->b_target->bt_mount; |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 217 | struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr; |
Dave Chinner | e481357 | 2012-11-12 22:54:14 +1100 | [diff] [blame] | 218 | |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 219 | if (xfs_sb_version_hascrc(&mp->m_sb)) { |
| 220 | if (hdr3->magic != cpu_to_be32(XFS_DIR3_DATA_MAGIC)) |
| 221 | return false; |
| 222 | if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_uuid)) |
| 223 | return false; |
| 224 | if (be64_to_cpu(hdr3->blkno) != bp->b_bn) |
| 225 | return false; |
| 226 | } else { |
| 227 | if (hdr3->magic != cpu_to_be32(XFS_DIR2_DATA_MAGIC)) |
| 228 | return false; |
Dave Chinner | e481357 | 2012-11-12 22:54:14 +1100 | [diff] [blame] | 229 | } |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 230 | if (__xfs_dir3_data_check(NULL, bp)) |
| 231 | return false; |
| 232 | return true; |
Dave Chinner | 612cfbf | 2012-11-14 17:52:32 +1100 | [diff] [blame] | 233 | } |
Dave Chinner | e481357 | 2012-11-12 22:54:14 +1100 | [diff] [blame] | 234 | |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 235 | /* |
| 236 | * Readahead of the first block of the directory when it is opened is completely |
| 237 | * oblivious to the format of the directory. Hence we can either get a block |
| 238 | * format buffer or a data format buffer on readahead. |
| 239 | */ |
| 240 | static void |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 241 | xfs_dir3_data_reada_verify( |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 242 | struct xfs_buf *bp) |
Dave Chinner | 612cfbf | 2012-11-14 17:52:32 +1100 | [diff] [blame] | 243 | { |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 244 | struct xfs_mount *mp = bp->b_target->bt_mount; |
| 245 | struct xfs_dir2_data_hdr *hdr = bp->b_addr; |
| 246 | |
| 247 | switch (hdr->magic) { |
| 248 | case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC): |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 249 | case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC): |
| 250 | bp->b_ops = &xfs_dir3_block_buf_ops; |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 251 | bp->b_ops->verify_read(bp); |
| 252 | return; |
| 253 | case cpu_to_be32(XFS_DIR2_DATA_MAGIC): |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 254 | case cpu_to_be32(XFS_DIR3_DATA_MAGIC): |
| 255 | xfs_dir3_data_verify(bp); |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 256 | return; |
| 257 | default: |
| 258 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, hdr); |
| 259 | xfs_buf_ioerror(bp, EFSCORRUPTED); |
| 260 | break; |
| 261 | } |
Dave Chinner | 612cfbf | 2012-11-14 17:52:32 +1100 | [diff] [blame] | 262 | } |
| 263 | |
Dave Chinner | b0f539d | 2012-11-14 17:53:49 +1100 | [diff] [blame] | 264 | static void |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 265 | xfs_dir3_data_read_verify( |
Dave Chinner | 612cfbf | 2012-11-14 17:52:32 +1100 | [diff] [blame] | 266 | struct xfs_buf *bp) |
| 267 | { |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 268 | struct xfs_mount *mp = bp->b_target->bt_mount; |
| 269 | |
| 270 | if ((xfs_sb_version_hascrc(&mp->m_sb) && |
| 271 | !xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length), |
| 272 | XFS_DIR3_DATA_CRC_OFF)) || |
| 273 | !xfs_dir3_data_verify(bp)) { |
| 274 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); |
| 275 | xfs_buf_ioerror(bp, EFSCORRUPTED); |
| 276 | } |
Dave Chinner | e481357 | 2012-11-12 22:54:14 +1100 | [diff] [blame] | 277 | } |
| 278 | |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 279 | static void |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 280 | xfs_dir3_data_write_verify( |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 281 | struct xfs_buf *bp) |
| 282 | { |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 283 | struct xfs_mount *mp = bp->b_target->bt_mount; |
| 284 | struct xfs_buf_log_item *bip = bp->b_fspriv; |
| 285 | struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr; |
| 286 | |
| 287 | if (!xfs_dir3_data_verify(bp)) { |
| 288 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); |
| 289 | xfs_buf_ioerror(bp, EFSCORRUPTED); |
| 290 | return; |
| 291 | } |
| 292 | |
| 293 | if (!xfs_sb_version_hascrc(&mp->m_sb)) |
| 294 | return; |
| 295 | |
| 296 | if (bip) |
| 297 | hdr3->lsn = cpu_to_be64(bip->bli_item.li_lsn); |
| 298 | |
| 299 | xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), XFS_DIR3_DATA_CRC_OFF); |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 300 | } |
| 301 | |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 302 | const struct xfs_buf_ops xfs_dir3_data_buf_ops = { |
| 303 | .verify_read = xfs_dir3_data_read_verify, |
| 304 | .verify_write = xfs_dir3_data_write_verify, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 305 | }; |
| 306 | |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 307 | static const struct xfs_buf_ops xfs_dir3_data_reada_buf_ops = { |
| 308 | .verify_read = xfs_dir3_data_reada_verify, |
| 309 | .verify_write = xfs_dir3_data_write_verify, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 310 | }; |
| 311 | |
Dave Chinner | 612cfbf | 2012-11-14 17:52:32 +1100 | [diff] [blame] | 312 | |
Dave Chinner | e481357 | 2012-11-12 22:54:14 +1100 | [diff] [blame] | 313 | int |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 314 | xfs_dir3_data_read( |
Dave Chinner | e481357 | 2012-11-12 22:54:14 +1100 | [diff] [blame] | 315 | struct xfs_trans *tp, |
| 316 | struct xfs_inode *dp, |
| 317 | xfs_dablk_t bno, |
| 318 | xfs_daddr_t mapped_bno, |
| 319 | struct xfs_buf **bpp) |
| 320 | { |
Dave Chinner | d75afeb | 2013-04-03 16:11:29 +1100 | [diff] [blame] | 321 | int err; |
| 322 | |
| 323 | err = xfs_da_read_buf(tp, dp, bno, mapped_bno, bpp, |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 324 | XFS_DATA_FORK, &xfs_dir3_data_buf_ops); |
Dave Chinner | d75afeb | 2013-04-03 16:11:29 +1100 | [diff] [blame] | 325 | if (!err && tp) |
Dave Chinner | 61fe135 | 2013-04-03 16:11:30 +1100 | [diff] [blame] | 326 | xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_DATA_BUF); |
Dave Chinner | d75afeb | 2013-04-03 16:11:29 +1100 | [diff] [blame] | 327 | return err; |
Dave Chinner | e481357 | 2012-11-12 22:54:14 +1100 | [diff] [blame] | 328 | } |
| 329 | |
Dave Chinner | da6958c | 2012-11-12 22:54:18 +1100 | [diff] [blame] | 330 | int |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 331 | xfs_dir3_data_readahead( |
Dave Chinner | da6958c | 2012-11-12 22:54:18 +1100 | [diff] [blame] | 332 | struct xfs_trans *tp, |
| 333 | struct xfs_inode *dp, |
| 334 | xfs_dablk_t bno, |
| 335 | xfs_daddr_t mapped_bno) |
| 336 | { |
| 337 | return xfs_da_reada_buf(tp, dp, bno, mapped_bno, |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 338 | XFS_DATA_FORK, &xfs_dir3_data_reada_buf_ops); |
Dave Chinner | da6958c | 2012-11-12 22:54:18 +1100 | [diff] [blame] | 339 | } |
| 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | /* |
| 342 | * Given a data block and an unused entry from that block, |
| 343 | * return the bestfree entry if any that corresponds to it. |
| 344 | */ |
Dave Chinner | 2b9ab5a | 2013-08-12 20:49:37 +1000 | [diff] [blame] | 345 | xfs_dir2_data_free_t * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | xfs_dir2_data_freefind( |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 347 | struct xfs_dir2_data_hdr *hdr, /* data block header */ |
| 348 | struct xfs_dir2_data_free *bf, /* bestfree table pointer */ |
| 349 | struct xfs_dir2_data_unused *dup) /* unused space */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | { |
| 351 | xfs_dir2_data_free_t *dfp; /* bestfree entry */ |
| 352 | xfs_dir2_data_aoff_t off; /* offset value needed */ |
Dave Chinner | b49a0c1 | 2013-08-12 20:49:51 +1000 | [diff] [blame] | 353 | #ifdef DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | int matched; /* matched the value */ |
| 355 | int seenzero; /* saw a 0 bestfree entry */ |
| 356 | #endif |
| 357 | |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 358 | off = (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr); |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 359 | |
Dave Chinner | b49a0c1 | 2013-08-12 20:49:51 +1000 | [diff] [blame] | 360 | #ifdef DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | /* |
| 362 | * Validate some consistency in the bestfree table. |
| 363 | * Check order, non-overlapping entries, and if we find the |
| 364 | * one we're looking for it has to be exact. |
| 365 | */ |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 366 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 367 | hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 368 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || |
| 369 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); |
| 370 | for (dfp = &bf[0], seenzero = matched = 0; |
| 371 | dfp < &bf[XFS_DIR2_DATA_FD_COUNT]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | dfp++) { |
| 373 | if (!dfp->offset) { |
| 374 | ASSERT(!dfp->length); |
| 375 | seenzero = 1; |
| 376 | continue; |
| 377 | } |
| 378 | ASSERT(seenzero == 0); |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 379 | if (be16_to_cpu(dfp->offset) == off) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | matched = 1; |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 381 | ASSERT(dfp->length == dup->length); |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 382 | } else if (off < be16_to_cpu(dfp->offset)) |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 383 | ASSERT(off + be16_to_cpu(dup->length) <= be16_to_cpu(dfp->offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | else |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 385 | ASSERT(be16_to_cpu(dfp->offset) + be16_to_cpu(dfp->length) <= off); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 386 | ASSERT(matched || be16_to_cpu(dfp->length) >= be16_to_cpu(dup->length)); |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 387 | if (dfp > &bf[0]) |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 388 | ASSERT(be16_to_cpu(dfp[-1].length) >= be16_to_cpu(dfp[0].length)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | } |
| 390 | #endif |
| 391 | /* |
| 392 | * If this is smaller than the smallest bestfree entry, |
| 393 | * it can't be there since they're sorted. |
| 394 | */ |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 395 | if (be16_to_cpu(dup->length) < |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 396 | be16_to_cpu(bf[XFS_DIR2_DATA_FD_COUNT - 1].length)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | return NULL; |
| 398 | /* |
| 399 | * Look at the three bestfree entries for our guy. |
| 400 | */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 401 | for (dfp = &bf[0]; dfp < &bf[XFS_DIR2_DATA_FD_COUNT]; dfp++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | if (!dfp->offset) |
| 403 | return NULL; |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 404 | if (be16_to_cpu(dfp->offset) == off) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | return dfp; |
| 406 | } |
| 407 | /* |
| 408 | * Didn't find it. This only happens if there are duplicate lengths. |
| 409 | */ |
| 410 | return NULL; |
| 411 | } |
| 412 | |
| 413 | /* |
| 414 | * Insert an unused-space entry into the bestfree table. |
| 415 | */ |
| 416 | xfs_dir2_data_free_t * /* entry inserted */ |
| 417 | xfs_dir2_data_freeinsert( |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 418 | struct xfs_dir2_data_hdr *hdr, /* data block pointer */ |
| 419 | struct xfs_dir2_data_free *dfp, /* bestfree table pointer */ |
| 420 | struct xfs_dir2_data_unused *dup, /* unused space */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | int *loghead) /* log the data header (out) */ |
| 422 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | xfs_dir2_data_free_t new; /* new bestfree entry */ |
| 424 | |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 425 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 426 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || |
| 427 | hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || |
| 428 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); |
| 429 | |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 430 | new.length = dup->length; |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 431 | new.offset = cpu_to_be16((char *)dup - (char *)hdr); |
| 432 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | /* |
| 434 | * Insert at position 0, 1, or 2; or not at all. |
| 435 | */ |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 436 | if (be16_to_cpu(new.length) > be16_to_cpu(dfp[0].length)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | dfp[2] = dfp[1]; |
| 438 | dfp[1] = dfp[0]; |
| 439 | dfp[0] = new; |
| 440 | *loghead = 1; |
| 441 | return &dfp[0]; |
| 442 | } |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 443 | if (be16_to_cpu(new.length) > be16_to_cpu(dfp[1].length)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | dfp[2] = dfp[1]; |
| 445 | dfp[1] = new; |
| 446 | *loghead = 1; |
| 447 | return &dfp[1]; |
| 448 | } |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 449 | if (be16_to_cpu(new.length) > be16_to_cpu(dfp[2].length)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | dfp[2] = new; |
| 451 | *loghead = 1; |
| 452 | return &dfp[2]; |
| 453 | } |
| 454 | return NULL; |
| 455 | } |
| 456 | |
| 457 | /* |
| 458 | * Remove a bestfree entry from the table. |
| 459 | */ |
Christoph Hellwig | ba0f32d | 2005-06-21 15:36:52 +1000 | [diff] [blame] | 460 | STATIC void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | xfs_dir2_data_freeremove( |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 462 | struct xfs_dir2_data_hdr *hdr, /* data block header */ |
| 463 | struct xfs_dir2_data_free *bf, /* bestfree table pointer */ |
| 464 | struct xfs_dir2_data_free *dfp, /* bestfree entry pointer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | int *loghead) /* out: log data header */ |
| 466 | { |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 467 | |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 468 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 469 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || |
| 470 | hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || |
| 471 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); |
| 472 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | /* |
| 474 | * It's the first entry, slide the next 2 up. |
| 475 | */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 476 | if (dfp == &bf[0]) { |
| 477 | bf[0] = bf[1]; |
| 478 | bf[1] = bf[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | } |
| 480 | /* |
| 481 | * It's the second entry, slide the 3rd entry up. |
| 482 | */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 483 | else if (dfp == &bf[1]) |
| 484 | bf[1] = bf[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | /* |
| 486 | * Must be the last entry. |
| 487 | */ |
| 488 | else |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 489 | ASSERT(dfp == &bf[2]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | /* |
| 491 | * Clear the 3rd entry, must be zero now. |
| 492 | */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 493 | bf[2].length = 0; |
| 494 | bf[2].offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | *loghead = 1; |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * Given a data block, reconstruct its bestfree map. |
| 500 | */ |
| 501 | void |
| 502 | xfs_dir2_data_freescan( |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 503 | struct xfs_inode *dp, |
| 504 | struct xfs_dir2_data_hdr *hdr, |
| 505 | int *loghead) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | { |
| 507 | xfs_dir2_block_tail_t *btp; /* block tail */ |
| 508 | xfs_dir2_data_entry_t *dep; /* active data entry */ |
| 509 | xfs_dir2_data_unused_t *dup; /* unused data entry */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 510 | struct xfs_dir2_data_free *bf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | char *endp; /* end of block's data */ |
| 512 | char *p; /* current entry pointer */ |
| 513 | |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 514 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 515 | hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 516 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || |
| 517 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); |
| 518 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | /* |
| 520 | * Start by clearing the table. |
| 521 | */ |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 522 | bf = dp->d_ops->data_bestfree_p(hdr); |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 523 | memset(bf, 0, sizeof(*bf) * XFS_DIR2_DATA_FD_COUNT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | *loghead = 1; |
| 525 | /* |
| 526 | * Set up pointers. |
| 527 | */ |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 528 | p = (char *)dp->d_ops->data_entry_p(hdr); |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 529 | if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || |
| 530 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) { |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 531 | btp = xfs_dir2_block_tail_p(dp->i_mount, hdr); |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 532 | endp = (char *)xfs_dir2_block_leaf_p(btp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | } else |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 534 | endp = (char *)hdr + dp->i_mount->m_dirblksize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | /* |
| 536 | * Loop over the block's entries. |
| 537 | */ |
| 538 | while (p < endp) { |
| 539 | dup = (xfs_dir2_data_unused_t *)p; |
| 540 | /* |
| 541 | * If it's a free entry, insert it. |
| 542 | */ |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 543 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 544 | ASSERT((char *)dup - (char *)hdr == |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 545 | be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup))); |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 546 | xfs_dir2_data_freeinsert(hdr, bf, dup, loghead); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 547 | p += be16_to_cpu(dup->length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | } |
| 549 | /* |
| 550 | * For active entries, check their tags and skip them. |
| 551 | */ |
| 552 | else { |
| 553 | dep = (xfs_dir2_data_entry_t *)p; |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 554 | ASSERT((char *)dep - (char *)hdr == |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 555 | be16_to_cpu(*dp->d_ops->data_entry_tag_p(dep))); |
| 556 | p += dp->d_ops->data_entsize(dep->namelen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | /* |
| 562 | * Initialize a data block at the given block number in the directory. |
| 563 | * Give back the buffer for the created block. |
| 564 | */ |
| 565 | int /* error */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 566 | xfs_dir3_data_init( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | xfs_da_args_t *args, /* directory operation args */ |
| 568 | xfs_dir2_db_t blkno, /* logical dir block number */ |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 569 | struct xfs_buf **bpp) /* output block buffer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | { |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 571 | struct xfs_buf *bp; /* block buffer */ |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 572 | xfs_dir2_data_hdr_t *hdr; /* data block header */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | xfs_inode_t *dp; /* incore directory inode */ |
| 574 | xfs_dir2_data_unused_t *dup; /* unused entry pointer */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 575 | struct xfs_dir2_data_free *bf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | int error; /* error return value */ |
| 577 | int i; /* bestfree index */ |
| 578 | xfs_mount_t *mp; /* filesystem mount point */ |
| 579 | xfs_trans_t *tp; /* transaction pointer */ |
| 580 | int t; /* temp */ |
| 581 | |
| 582 | dp = args->dp; |
| 583 | mp = dp->i_mount; |
| 584 | tp = args->trans; |
| 585 | /* |
| 586 | * Get the buffer set up for the block. |
| 587 | */ |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 588 | error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, blkno), -1, &bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | XFS_DATA_FORK); |
Dave Chinner | b0f539d | 2012-11-14 17:53:49 +1100 | [diff] [blame] | 590 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | return error; |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 592 | bp->b_ops = &xfs_dir3_data_buf_ops; |
Dave Chinner | 61fe135 | 2013-04-03 16:11:30 +1100 | [diff] [blame] | 593 | xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_DATA_BUF); |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 594 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | /* |
| 596 | * Initialize the header. |
| 597 | */ |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 598 | hdr = bp->b_addr; |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 599 | if (xfs_sb_version_hascrc(&mp->m_sb)) { |
| 600 | struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr; |
| 601 | |
| 602 | memset(hdr3, 0, sizeof(*hdr3)); |
| 603 | hdr3->magic = cpu_to_be32(XFS_DIR3_DATA_MAGIC); |
| 604 | hdr3->blkno = cpu_to_be64(bp->b_bn); |
| 605 | hdr3->owner = cpu_to_be64(dp->i_ino); |
| 606 | uuid_copy(&hdr3->uuid, &mp->m_sb.sb_uuid); |
| 607 | |
| 608 | } else |
| 609 | hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC); |
| 610 | |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 611 | bf = dp->d_ops->data_bestfree_p(hdr); |
Dave Chinner | 1c9a5b2 | 2013-10-30 09:15:02 +1100 | [diff] [blame] | 612 | bf[0].offset = cpu_to_be16(dp->d_ops->data_entry_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | for (i = 1; i < XFS_DIR2_DATA_FD_COUNT; i++) { |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 614 | bf[i].length = 0; |
| 615 | bf[i].offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | } |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 617 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | /* |
| 619 | * Set up an unused entry for the block's body. |
| 620 | */ |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 621 | dup = dp->d_ops->data_unused_p(hdr); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 622 | dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | |
Dave Chinner | 1c9a5b2 | 2013-10-30 09:15:02 +1100 | [diff] [blame] | 624 | t = mp->m_dirblksize - (uint)dp->d_ops->data_entry_offset; |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 625 | bf[0].length = cpu_to_be16(t); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 626 | dup->length = cpu_to_be16(t); |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 627 | *xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16((char *)dup - (char *)hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | /* |
| 629 | * Log it and return it. |
| 630 | */ |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 631 | xfs_dir2_data_log_header(tp, dp, bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | xfs_dir2_data_log_unused(tp, bp, dup); |
| 633 | *bpp = bp; |
| 634 | return 0; |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * Log an active data entry from the block. |
| 639 | */ |
| 640 | void |
| 641 | xfs_dir2_data_log_entry( |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 642 | struct xfs_trans *tp, |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 643 | struct xfs_inode *dp, |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 644 | struct xfs_buf *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | xfs_dir2_data_entry_t *dep) /* data entry pointer */ |
| 646 | { |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 647 | struct xfs_dir2_data_hdr *hdr = bp->b_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 649 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 650 | hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 651 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || |
| 652 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 653 | |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 654 | xfs_trans_log_buf(tp, bp, (uint)((char *)dep - (char *)hdr), |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 655 | (uint)((char *)(dp->d_ops->data_entry_tag_p(dep) + 1) - |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 656 | (char *)hdr - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | } |
| 658 | |
| 659 | /* |
| 660 | * Log a data block header. |
| 661 | */ |
| 662 | void |
| 663 | xfs_dir2_data_log_header( |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 664 | struct xfs_trans *tp, |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 665 | struct xfs_inode *dp, |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 666 | struct xfs_buf *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | { |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 668 | #ifdef DEBUG |
| 669 | struct xfs_dir2_data_hdr *hdr = bp->b_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 671 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 672 | hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 673 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || |
| 674 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 675 | #endif |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 676 | |
Dave Chinner | 1c9a5b2 | 2013-10-30 09:15:02 +1100 | [diff] [blame] | 677 | xfs_trans_log_buf(tp, bp, 0, dp->d_ops->data_entry_offset - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | /* |
| 681 | * Log a data unused entry. |
| 682 | */ |
| 683 | void |
| 684 | xfs_dir2_data_log_unused( |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 685 | struct xfs_trans *tp, |
| 686 | struct xfs_buf *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | xfs_dir2_data_unused_t *dup) /* data unused pointer */ |
| 688 | { |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 689 | xfs_dir2_data_hdr_t *hdr = bp->b_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 691 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 692 | hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 693 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || |
| 694 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 695 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | /* |
| 697 | * Log the first part of the unused entry. |
| 698 | */ |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 699 | xfs_trans_log_buf(tp, bp, (uint)((char *)dup - (char *)hdr), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | (uint)((char *)&dup->length + sizeof(dup->length) - |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 701 | 1 - (char *)hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | /* |
| 703 | * Log the end (tag) of the unused entry. |
| 704 | */ |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 705 | xfs_trans_log_buf(tp, bp, |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 706 | (uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr), |
| 707 | (uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | sizeof(xfs_dir2_data_off_t) - 1)); |
| 709 | } |
| 710 | |
| 711 | /* |
| 712 | * Make a byte range in the data block unused. |
| 713 | * Its current contents are unimportant. |
| 714 | */ |
| 715 | void |
| 716 | xfs_dir2_data_make_free( |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 717 | struct xfs_trans *tp, |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 718 | struct xfs_inode *dp, |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 719 | struct xfs_buf *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | xfs_dir2_data_aoff_t offset, /* starting byte offset */ |
| 721 | xfs_dir2_data_aoff_t len, /* length in bytes */ |
| 722 | int *needlogp, /* out: log header */ |
| 723 | int *needscanp) /* out: regen bestfree */ |
| 724 | { |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 725 | xfs_dir2_data_hdr_t *hdr; /* data block pointer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | xfs_dir2_data_free_t *dfp; /* bestfree pointer */ |
| 727 | char *endptr; /* end of data area */ |
| 728 | xfs_mount_t *mp; /* filesystem mount point */ |
| 729 | int needscan; /* need to regen bestfree */ |
| 730 | xfs_dir2_data_unused_t *newdup; /* new unused entry */ |
| 731 | xfs_dir2_data_unused_t *postdup; /* unused entry after us */ |
| 732 | xfs_dir2_data_unused_t *prevdup; /* unused entry before us */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 733 | struct xfs_dir2_data_free *bf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
| 735 | mp = tp->t_mountp; |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 736 | hdr = bp->b_addr; |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 737 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | /* |
| 739 | * Figure out where the end of the data area is. |
| 740 | */ |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 741 | if (hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
| 742 | hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC)) |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 743 | endptr = (char *)hdr + mp->m_dirblksize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | else { |
| 745 | xfs_dir2_block_tail_t *btp; /* block tail */ |
| 746 | |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 747 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || |
| 748 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 749 | btp = xfs_dir2_block_tail_p(mp, hdr); |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 750 | endptr = (char *)xfs_dir2_block_leaf_p(btp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | } |
| 752 | /* |
| 753 | * If this isn't the start of the block, then back up to |
| 754 | * the previous entry and see if it's free. |
| 755 | */ |
Dave Chinner | 1c9a5b2 | 2013-10-30 09:15:02 +1100 | [diff] [blame] | 756 | if (offset > dp->d_ops->data_entry_offset) { |
Nathan Scott | 3d693c6 | 2006-03-17 17:28:27 +1100 | [diff] [blame] | 757 | __be16 *tagp; /* tag just before us */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 759 | tagp = (__be16 *)((char *)hdr + offset) - 1; |
| 760 | prevdup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp)); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 761 | if (be16_to_cpu(prevdup->freetag) != XFS_DIR2_DATA_FREE_TAG) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | prevdup = NULL; |
| 763 | } else |
| 764 | prevdup = NULL; |
| 765 | /* |
| 766 | * If this isn't the end of the block, see if the entry after |
| 767 | * us is free. |
| 768 | */ |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 769 | if ((char *)hdr + offset + len < endptr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | postdup = |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 771 | (xfs_dir2_data_unused_t *)((char *)hdr + offset + len); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 772 | if (be16_to_cpu(postdup->freetag) != XFS_DIR2_DATA_FREE_TAG) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | postdup = NULL; |
| 774 | } else |
| 775 | postdup = NULL; |
| 776 | ASSERT(*needscanp == 0); |
| 777 | needscan = 0; |
| 778 | /* |
| 779 | * Previous and following entries are both free, |
| 780 | * merge everything into a single free entry. |
| 781 | */ |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 782 | bf = dp->d_ops->data_bestfree_p(hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | if (prevdup && postdup) { |
| 784 | xfs_dir2_data_free_t *dfp2; /* another bestfree pointer */ |
| 785 | |
| 786 | /* |
| 787 | * See if prevdup and/or postdup are in bestfree table. |
| 788 | */ |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 789 | dfp = xfs_dir2_data_freefind(hdr, bf, prevdup); |
| 790 | dfp2 = xfs_dir2_data_freefind(hdr, bf, postdup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | /* |
| 792 | * We need a rescan unless there are exactly 2 free entries |
| 793 | * namely our two. Then we know what's happening, otherwise |
| 794 | * since the third bestfree is there, there might be more |
| 795 | * entries. |
| 796 | */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 797 | needscan = (bf[2].length != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | /* |
| 799 | * Fix up the new big freespace. |
| 800 | */ |
Marcin Slusarz | 413d57c | 2008-02-13 15:03:29 -0800 | [diff] [blame] | 801 | be16_add_cpu(&prevdup->length, len + be16_to_cpu(postdup->length)); |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 802 | *xfs_dir2_data_unused_tag_p(prevdup) = |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 803 | cpu_to_be16((char *)prevdup - (char *)hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | xfs_dir2_data_log_unused(tp, bp, prevdup); |
| 805 | if (!needscan) { |
| 806 | /* |
| 807 | * Has to be the case that entries 0 and 1 are |
| 808 | * dfp and dfp2 (don't know which is which), and |
| 809 | * entry 2 is empty. |
| 810 | * Remove entry 1 first then entry 0. |
| 811 | */ |
| 812 | ASSERT(dfp && dfp2); |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 813 | if (dfp == &bf[1]) { |
| 814 | dfp = &bf[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | ASSERT(dfp2 == dfp); |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 816 | dfp2 = &bf[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | } |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 818 | xfs_dir2_data_freeremove(hdr, bf, dfp2, needlogp); |
| 819 | xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | /* |
| 821 | * Now insert the new entry. |
| 822 | */ |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 823 | dfp = xfs_dir2_data_freeinsert(hdr, bf, prevdup, |
| 824 | needlogp); |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 825 | ASSERT(dfp == &bf[0]); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 826 | ASSERT(dfp->length == prevdup->length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | ASSERT(!dfp[1].length); |
| 828 | ASSERT(!dfp[2].length); |
| 829 | } |
| 830 | } |
| 831 | /* |
| 832 | * The entry before us is free, merge with it. |
| 833 | */ |
| 834 | else if (prevdup) { |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 835 | dfp = xfs_dir2_data_freefind(hdr, bf, prevdup); |
Marcin Slusarz | 413d57c | 2008-02-13 15:03:29 -0800 | [diff] [blame] | 836 | be16_add_cpu(&prevdup->length, len); |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 837 | *xfs_dir2_data_unused_tag_p(prevdup) = |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 838 | cpu_to_be16((char *)prevdup - (char *)hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | xfs_dir2_data_log_unused(tp, bp, prevdup); |
| 840 | /* |
| 841 | * If the previous entry was in the table, the new entry |
| 842 | * is longer, so it will be in the table too. Remove |
| 843 | * the old one and add the new one. |
| 844 | */ |
| 845 | if (dfp) { |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 846 | xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp); |
| 847 | xfs_dir2_data_freeinsert(hdr, bf, prevdup, needlogp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | } |
| 849 | /* |
| 850 | * Otherwise we need a scan if the new entry is big enough. |
| 851 | */ |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 852 | else { |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 853 | needscan = be16_to_cpu(prevdup->length) > |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 854 | be16_to_cpu(bf[2].length); |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 855 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
| 857 | /* |
| 858 | * The following entry is free, merge with it. |
| 859 | */ |
| 860 | else if (postdup) { |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 861 | dfp = xfs_dir2_data_freefind(hdr, bf, postdup); |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 862 | newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 863 | newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); |
| 864 | newdup->length = cpu_to_be16(len + be16_to_cpu(postdup->length)); |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 865 | *xfs_dir2_data_unused_tag_p(newdup) = |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 866 | cpu_to_be16((char *)newdup - (char *)hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | xfs_dir2_data_log_unused(tp, bp, newdup); |
| 868 | /* |
| 869 | * If the following entry was in the table, the new entry |
| 870 | * is longer, so it will be in the table too. Remove |
| 871 | * the old one and add the new one. |
| 872 | */ |
| 873 | if (dfp) { |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 874 | xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp); |
| 875 | xfs_dir2_data_freeinsert(hdr, bf, newdup, needlogp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | } |
| 877 | /* |
| 878 | * Otherwise we need a scan if the new entry is big enough. |
| 879 | */ |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 880 | else { |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 881 | needscan = be16_to_cpu(newdup->length) > |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 882 | be16_to_cpu(bf[2].length); |
Nathan Scott | 70e73f5 | 2006-03-17 17:26:52 +1100 | [diff] [blame] | 883 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | } |
| 885 | /* |
| 886 | * Neither neighbor is free. Make a new entry. |
| 887 | */ |
| 888 | else { |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 889 | newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 890 | newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); |
| 891 | newdup->length = cpu_to_be16(len); |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 892 | *xfs_dir2_data_unused_tag_p(newdup) = |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 893 | cpu_to_be16((char *)newdup - (char *)hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | xfs_dir2_data_log_unused(tp, bp, newdup); |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 895 | xfs_dir2_data_freeinsert(hdr, bf, newdup, needlogp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | } |
| 897 | *needscanp = needscan; |
| 898 | } |
| 899 | |
| 900 | /* |
| 901 | * Take a byte range out of an existing unused space and make it un-free. |
| 902 | */ |
| 903 | void |
| 904 | xfs_dir2_data_use_free( |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 905 | struct xfs_trans *tp, |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 906 | struct xfs_inode *dp, |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 907 | struct xfs_buf *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | xfs_dir2_data_unused_t *dup, /* unused entry */ |
| 909 | xfs_dir2_data_aoff_t offset, /* starting offset to use */ |
| 910 | xfs_dir2_data_aoff_t len, /* length to use */ |
| 911 | int *needlogp, /* out: need to log header */ |
| 912 | int *needscanp) /* out: need regen bestfree */ |
| 913 | { |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 914 | xfs_dir2_data_hdr_t *hdr; /* data block header */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | xfs_dir2_data_free_t *dfp; /* bestfree pointer */ |
| 916 | int matchback; /* matches end of freespace */ |
| 917 | int matchfront; /* matches start of freespace */ |
| 918 | int needscan; /* need to regen bestfree */ |
| 919 | xfs_dir2_data_unused_t *newdup; /* new unused entry */ |
| 920 | xfs_dir2_data_unused_t *newdup2; /* another new unused entry */ |
| 921 | int oldlen; /* old unused entry's length */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 922 | struct xfs_dir2_data_free *bf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | |
Dave Chinner | 1d9025e | 2012-06-22 18:50:14 +1000 | [diff] [blame] | 924 | hdr = bp->b_addr; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 925 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 926 | hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 927 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || |
| 928 | hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 929 | ASSERT(be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG); |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 930 | ASSERT(offset >= (char *)dup - (char *)hdr); |
| 931 | ASSERT(offset + len <= (char *)dup + be16_to_cpu(dup->length) - (char *)hdr); |
| 932 | ASSERT((char *)dup - (char *)hdr == be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | /* |
| 934 | * Look up the entry in the bestfree table. |
| 935 | */ |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 936 | oldlen = be16_to_cpu(dup->length); |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 937 | bf = dp->d_ops->data_bestfree_p(hdr); |
| 938 | dfp = xfs_dir2_data_freefind(hdr, bf, dup); |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 939 | ASSERT(dfp || oldlen <= be16_to_cpu(bf[2].length)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | /* |
| 941 | * Check for alignment with front and back of the entry. |
| 942 | */ |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 943 | matchfront = (char *)dup - (char *)hdr == offset; |
| 944 | matchback = (char *)dup + oldlen - (char *)hdr == offset + len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | ASSERT(*needscanp == 0); |
| 946 | needscan = 0; |
| 947 | /* |
| 948 | * If we matched it exactly we just need to get rid of it from |
| 949 | * the bestfree table. |
| 950 | */ |
| 951 | if (matchfront && matchback) { |
| 952 | if (dfp) { |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 953 | needscan = (bf[2].offset != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | if (!needscan) |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 955 | xfs_dir2_data_freeremove(hdr, bf, dfp, |
| 956 | needlogp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | } |
| 958 | } |
| 959 | /* |
| 960 | * We match the first part of the entry. |
| 961 | * Make a new entry with the remaining freespace. |
| 962 | */ |
| 963 | else if (matchfront) { |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 964 | newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 965 | newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); |
| 966 | newdup->length = cpu_to_be16(oldlen - len); |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 967 | *xfs_dir2_data_unused_tag_p(newdup) = |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 968 | cpu_to_be16((char *)newdup - (char *)hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | xfs_dir2_data_log_unused(tp, bp, newdup); |
| 970 | /* |
| 971 | * If it was in the table, remove it and add the new one. |
| 972 | */ |
| 973 | if (dfp) { |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 974 | xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp); |
| 975 | dfp = xfs_dir2_data_freeinsert(hdr, bf, newdup, |
| 976 | needlogp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | ASSERT(dfp != NULL); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 978 | ASSERT(dfp->length == newdup->length); |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 979 | ASSERT(be16_to_cpu(dfp->offset) == (char *)newdup - (char *)hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | /* |
| 981 | * If we got inserted at the last slot, |
| 982 | * that means we don't know if there was a better |
| 983 | * choice for the last slot, or not. Rescan. |
| 984 | */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 985 | needscan = dfp == &bf[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | } |
| 987 | } |
| 988 | /* |
| 989 | * We match the last part of the entry. |
| 990 | * Trim the allocated space off the tail of the entry. |
| 991 | */ |
| 992 | else if (matchback) { |
| 993 | newdup = dup; |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 994 | newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup); |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 995 | *xfs_dir2_data_unused_tag_p(newdup) = |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 996 | cpu_to_be16((char *)newdup - (char *)hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | xfs_dir2_data_log_unused(tp, bp, newdup); |
| 998 | /* |
| 999 | * If it was in the table, remove it and add the new one. |
| 1000 | */ |
| 1001 | if (dfp) { |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 1002 | xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp); |
| 1003 | dfp = xfs_dir2_data_freeinsert(hdr, bf, newdup, |
| 1004 | needlogp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | ASSERT(dfp != NULL); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 1006 | ASSERT(dfp->length == newdup->length); |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 1007 | ASSERT(be16_to_cpu(dfp->offset) == (char *)newdup - (char *)hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | /* |
| 1009 | * If we got inserted at the last slot, |
| 1010 | * that means we don't know if there was a better |
| 1011 | * choice for the last slot, or not. Rescan. |
| 1012 | */ |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 1013 | needscan = dfp == &bf[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | } |
| 1015 | } |
| 1016 | /* |
| 1017 | * Poking out the middle of an entry. |
| 1018 | * Make two new entries. |
| 1019 | */ |
| 1020 | else { |
| 1021 | newdup = dup; |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 1022 | newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup); |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 1023 | *xfs_dir2_data_unused_tag_p(newdup) = |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 1024 | cpu_to_be16((char *)newdup - (char *)hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | xfs_dir2_data_log_unused(tp, bp, newdup); |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 1026 | newdup2 = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len); |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 1027 | newdup2->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); |
| 1028 | newdup2->length = cpu_to_be16(oldlen - len - be16_to_cpu(newdup->length)); |
Christoph Hellwig | bbaaf53 | 2007-06-28 16:43:50 +1000 | [diff] [blame] | 1029 | *xfs_dir2_data_unused_tag_p(newdup2) = |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 1030 | cpu_to_be16((char *)newdup2 - (char *)hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | xfs_dir2_data_log_unused(tp, bp, newdup2); |
| 1032 | /* |
| 1033 | * If the old entry was in the table, we need to scan |
| 1034 | * if the 3rd entry was valid, since these entries |
| 1035 | * are smaller than the old one. |
| 1036 | * If we don't need to scan that means there were 1 or 2 |
| 1037 | * entries in the table, and removing the old and adding |
| 1038 | * the 2 new will work. |
| 1039 | */ |
| 1040 | if (dfp) { |
Dave Chinner | f5f3d9b | 2013-04-03 16:11:20 +1100 | [diff] [blame] | 1041 | needscan = (bf[2].length != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | if (!needscan) { |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 1043 | xfs_dir2_data_freeremove(hdr, bf, dfp, |
| 1044 | needlogp); |
| 1045 | xfs_dir2_data_freeinsert(hdr, bf, newdup, |
| 1046 | needlogp); |
| 1047 | xfs_dir2_data_freeinsert(hdr, bf, newdup2, |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 1048 | needlogp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | } |
| 1050 | } |
| 1051 | } |
| 1052 | *needscanp = needscan; |
| 1053 | } |