Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| 3 | * Copyright (c) 2013 Red Hat, Inc. |
| 4 | * All Rights Reserved. |
| 5 | * |
| 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 |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 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. |
| 14 | * |
| 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 |
| 18 | */ |
| 19 | #include "xfs.h" |
| 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" |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 24 | #include "xfs_bit.h" |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 25 | #include "xfs_mount.h" |
Dave Chinner | 5706278 | 2013-10-15 09:17:51 +1100 | [diff] [blame] | 26 | #include "xfs_da_format.h" |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 27 | #include "xfs_da_btree.h" |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 28 | #include "xfs_inode.h" |
Dave Chinner | 2b9ab5a | 2013-08-12 20:49:37 +1000 | [diff] [blame] | 29 | #include "xfs_dir2.h" |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 30 | #include "xfs_dir2_priv.h" |
| 31 | #include "xfs_error.h" |
| 32 | #include "xfs_trace.h" |
| 33 | #include "xfs_bmap.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 34 | #include "xfs_trans.h" |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 35 | |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 36 | /* |
| 37 | * Directory file type support functions |
| 38 | */ |
| 39 | static unsigned char xfs_dir3_filetype_table[] = { |
| 40 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, |
| 41 | DT_FIFO, DT_SOCK, DT_LNK, DT_WHT, |
| 42 | }; |
| 43 | |
Dave Chinner | 1b767ee | 2014-12-04 09:43:17 +1100 | [diff] [blame] | 44 | static unsigned char |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 45 | xfs_dir3_get_dtype( |
| 46 | struct xfs_mount *mp, |
| 47 | __uint8_t filetype) |
| 48 | { |
| 49 | if (!xfs_sb_version_hasftype(&mp->m_sb)) |
| 50 | return DT_UNKNOWN; |
| 51 | |
| 52 | if (filetype >= XFS_DIR3_FT_MAX) |
| 53 | return DT_UNKNOWN; |
| 54 | |
| 55 | return xfs_dir3_filetype_table[filetype]; |
| 56 | } |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 57 | |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 58 | STATIC int |
| 59 | xfs_dir2_sf_getdents( |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 60 | struct xfs_da_args *args, |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 61 | struct dir_context *ctx) |
| 62 | { |
| 63 | int i; /* shortform entry number */ |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 64 | struct xfs_inode *dp = args->dp; /* incore directory inode */ |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 65 | xfs_dir2_dataptr_t off; /* current entry's offset */ |
| 66 | xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */ |
| 67 | xfs_dir2_sf_hdr_t *sfp; /* shortform structure */ |
| 68 | xfs_dir2_dataptr_t dot_offset; |
| 69 | xfs_dir2_dataptr_t dotdot_offset; |
| 70 | xfs_ino_t ino; |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 71 | struct xfs_da_geometry *geo = args->geo; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 72 | |
| 73 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); |
| 74 | /* |
| 75 | * Give up if the directory is way too short. |
| 76 | */ |
| 77 | if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) { |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 78 | ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 79 | return -EIO; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); |
| 83 | ASSERT(dp->i_df.if_u1.if_data != NULL); |
| 84 | |
| 85 | sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data; |
| 86 | |
Darrick J. Wong | 9cdafd8 | 2016-10-03 09:11:15 -0700 | [diff] [blame] | 87 | if (dp->i_d.di_size < xfs_dir2_sf_hdr_size(sfp->i8count)) |
| 88 | return -EFSCORRUPTED; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 89 | |
| 90 | /* |
| 91 | * If the block number in the offset is out of range, we're done. |
| 92 | */ |
Dave Chinner | 7dda6e8 | 2014-06-06 15:11:18 +1000 | [diff] [blame] | 93 | if (xfs_dir2_dataptr_to_db(geo, ctx->pos) > geo->datablk) |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 94 | return 0; |
| 95 | |
| 96 | /* |
| 97 | * Precalculate offsets for . and .. as we will always need them. |
| 98 | * |
| 99 | * XXX(hch): the second argument is sometimes 0 and sometimes |
Dave Chinner | 7dda6e8 | 2014-06-06 15:11:18 +1000 | [diff] [blame] | 100 | * geo->datablk |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 101 | */ |
Dave Chinner | 7dda6e8 | 2014-06-06 15:11:18 +1000 | [diff] [blame] | 102 | dot_offset = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
Dave Chinner | 1c9a5b2 | 2013-10-30 09:15:02 +1100 | [diff] [blame] | 103 | dp->d_ops->data_dot_offset); |
Dave Chinner | 7dda6e8 | 2014-06-06 15:11:18 +1000 | [diff] [blame] | 104 | dotdot_offset = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
Dave Chinner | 1c9a5b2 | 2013-10-30 09:15:02 +1100 | [diff] [blame] | 105 | dp->d_ops->data_dotdot_offset); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 106 | |
| 107 | /* |
| 108 | * Put . entry unless we're starting past it. |
| 109 | */ |
| 110 | if (ctx->pos <= dot_offset) { |
| 111 | ctx->pos = dot_offset & 0x7fffffff; |
| 112 | if (!dir_emit(ctx, ".", 1, dp->i_ino, DT_DIR)) |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | /* |
| 117 | * Put .. entry unless we're starting past it. |
| 118 | */ |
| 119 | if (ctx->pos <= dotdot_offset) { |
Dave Chinner | 4740175 | 2013-10-29 22:11:47 +1100 | [diff] [blame] | 120 | ino = dp->d_ops->sf_get_parent_ino(sfp); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 121 | ctx->pos = dotdot_offset & 0x7fffffff; |
| 122 | if (!dir_emit(ctx, "..", 2, ino, DT_DIR)) |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | /* |
| 127 | * Loop while there are more entries and put'ing works. |
| 128 | */ |
| 129 | sfep = xfs_dir2_sf_firstentry(sfp); |
| 130 | for (i = 0; i < sfp->count; i++) { |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 131 | __uint8_t filetype; |
| 132 | |
Dave Chinner | 7dda6e8 | 2014-06-06 15:11:18 +1000 | [diff] [blame] | 133 | off = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 134 | xfs_dir2_sf_get_offset(sfep)); |
| 135 | |
| 136 | if (ctx->pos > off) { |
Dave Chinner | 32c5483 | 2013-10-29 22:11:46 +1100 | [diff] [blame] | 137 | sfep = dp->d_ops->sf_nextentry(sfp, sfep); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 138 | continue; |
| 139 | } |
| 140 | |
Dave Chinner | 4740175 | 2013-10-29 22:11:47 +1100 | [diff] [blame] | 141 | ino = dp->d_ops->sf_get_ino(sfp, sfep); |
| 142 | filetype = dp->d_ops->sf_get_ftype(sfep); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 143 | ctx->pos = off & 0x7fffffff; |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 144 | if (!dir_emit(ctx, (char *)sfep->name, sfep->namelen, ino, |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 145 | xfs_dir3_get_dtype(dp->i_mount, filetype))) |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 146 | return 0; |
Dave Chinner | 32c5483 | 2013-10-29 22:11:46 +1100 | [diff] [blame] | 147 | sfep = dp->d_ops->sf_nextentry(sfp, sfep); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 148 | } |
| 149 | |
Dave Chinner | 7dda6e8 | 2014-06-06 15:11:18 +1000 | [diff] [blame] | 150 | ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) & |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 151 | 0x7fffffff; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * Readdir for block directories. |
| 157 | */ |
| 158 | STATIC int |
| 159 | xfs_dir2_block_getdents( |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 160 | struct xfs_da_args *args, |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 161 | struct dir_context *ctx) |
| 162 | { |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 163 | struct xfs_inode *dp = args->dp; /* incore directory inode */ |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 164 | xfs_dir2_data_hdr_t *hdr; /* block header */ |
| 165 | struct xfs_buf *bp; /* buffer for block */ |
| 166 | xfs_dir2_block_tail_t *btp; /* block tail */ |
| 167 | xfs_dir2_data_entry_t *dep; /* block data entry */ |
| 168 | xfs_dir2_data_unused_t *dup; /* block unused entry */ |
| 169 | char *endptr; /* end of the data entries */ |
| 170 | int error; /* error return value */ |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 171 | char *ptr; /* current data entry */ |
| 172 | int wantoff; /* starting block offset */ |
| 173 | xfs_off_t cook; |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 174 | struct xfs_da_geometry *geo = args->geo; |
Dave Chinner | dbad7c9 | 2015-08-19 10:33:00 +1000 | [diff] [blame] | 175 | int lock_mode; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 176 | |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 177 | /* |
| 178 | * If the block number in the offset is out of range, we're done. |
| 179 | */ |
Dave Chinner | 7dda6e8 | 2014-06-06 15:11:18 +1000 | [diff] [blame] | 180 | if (xfs_dir2_dataptr_to_db(geo, ctx->pos) > geo->datablk) |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 181 | return 0; |
| 182 | |
Dave Chinner | dbad7c9 | 2015-08-19 10:33:00 +1000 | [diff] [blame] | 183 | lock_mode = xfs_ilock_data_map_shared(dp); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 184 | error = xfs_dir3_block_read(NULL, dp, &bp); |
Dave Chinner | dbad7c9 | 2015-08-19 10:33:00 +1000 | [diff] [blame] | 185 | xfs_iunlock(dp, lock_mode); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 186 | if (error) |
| 187 | return error; |
| 188 | |
| 189 | /* |
| 190 | * Extract the byte offset we start at from the seek pointer. |
| 191 | * We'll skip entries before this. |
| 192 | */ |
Dave Chinner | 3002803 | 2014-06-06 15:08:18 +1000 | [diff] [blame] | 193 | wantoff = xfs_dir2_dataptr_to_off(geo, ctx->pos); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 194 | hdr = bp->b_addr; |
| 195 | xfs_dir3_data_check(dp, bp); |
| 196 | /* |
| 197 | * Set up values for the loop. |
| 198 | */ |
Dave Chinner | 8f66193 | 2014-06-06 15:15:59 +1000 | [diff] [blame] | 199 | btp = xfs_dir2_block_tail_p(geo, hdr); |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 200 | ptr = (char *)dp->d_ops->data_entry_p(hdr); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 201 | endptr = (char *)xfs_dir2_block_leaf_p(btp); |
| 202 | |
| 203 | /* |
| 204 | * Loop over the data portion of the block. |
| 205 | * Each object is a real entry (dep) or an unused one (dup). |
| 206 | */ |
| 207 | while (ptr < endptr) { |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 208 | __uint8_t filetype; |
| 209 | |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 210 | dup = (xfs_dir2_data_unused_t *)ptr; |
| 211 | /* |
| 212 | * Unused, skip it. |
| 213 | */ |
| 214 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { |
| 215 | ptr += be16_to_cpu(dup->length); |
| 216 | continue; |
| 217 | } |
| 218 | |
| 219 | dep = (xfs_dir2_data_entry_t *)ptr; |
| 220 | |
| 221 | /* |
| 222 | * Bump pointer for the next iteration. |
| 223 | */ |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 224 | ptr += dp->d_ops->data_entsize(dep->namelen); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 225 | /* |
| 226 | * The entry is before the desired starting point, skip it. |
| 227 | */ |
| 228 | if ((char *)dep - (char *)hdr < wantoff) |
| 229 | continue; |
| 230 | |
Dave Chinner | 7dda6e8 | 2014-06-06 15:11:18 +1000 | [diff] [blame] | 231 | cook = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 232 | (char *)dep - (char *)hdr); |
| 233 | |
| 234 | ctx->pos = cook & 0x7fffffff; |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 235 | filetype = dp->d_ops->data_get_ftype(dep); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 236 | /* |
| 237 | * If it didn't fit, set the final offset to here & return. |
| 238 | */ |
| 239 | if (!dir_emit(ctx, (char *)dep->name, dep->namelen, |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 240 | be64_to_cpu(dep->inumber), |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 241 | xfs_dir3_get_dtype(dp->i_mount, filetype))) { |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 242 | xfs_trans_brelse(NULL, bp); |
| 243 | return 0; |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | /* |
| 248 | * Reached the end of the block. |
| 249 | * Set the offset to a non-existent block 1 and return. |
| 250 | */ |
Dave Chinner | 7dda6e8 | 2014-06-06 15:11:18 +1000 | [diff] [blame] | 251 | ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) & |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 252 | 0x7fffffff; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 253 | xfs_trans_brelse(NULL, bp); |
| 254 | return 0; |
| 255 | } |
| 256 | |
| 257 | struct xfs_dir2_leaf_map_info { |
| 258 | xfs_extlen_t map_blocks; /* number of fsbs in map */ |
| 259 | xfs_dablk_t map_off; /* last mapped file offset */ |
| 260 | int map_size; /* total entries in *map */ |
| 261 | int map_valid; /* valid entries in *map */ |
| 262 | int nmap; /* mappings to ask xfs_bmapi */ |
| 263 | xfs_dir2_db_t curdb; /* db for current block */ |
| 264 | int ra_current; /* number of read-ahead blks */ |
| 265 | int ra_index; /* *map index for read-ahead */ |
| 266 | int ra_offset; /* map entry offset for ra */ |
| 267 | int ra_want; /* readahead count wanted */ |
| 268 | struct xfs_bmbt_irec map[]; /* map vector for blocks */ |
| 269 | }; |
| 270 | |
| 271 | STATIC int |
| 272 | xfs_dir2_leaf_readbuf( |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 273 | struct xfs_da_args *args, |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 274 | size_t bufsize, |
| 275 | struct xfs_dir2_leaf_map_info *mip, |
| 276 | xfs_dir2_off_t *curoff, |
Dave Chinner | 9f54180 | 2016-05-19 00:17:26 +1000 | [diff] [blame] | 277 | struct xfs_buf **bpp, |
| 278 | bool trim_map) |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 279 | { |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 280 | struct xfs_inode *dp = args->dp; |
Dave Chinner | 9f54180 | 2016-05-19 00:17:26 +1000 | [diff] [blame] | 281 | struct xfs_buf *bp = NULL; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 282 | struct xfs_bmbt_irec *map = mip->map; |
| 283 | struct blk_plug plug; |
| 284 | int error = 0; |
| 285 | int length; |
| 286 | int i; |
| 287 | int j; |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 288 | struct xfs_da_geometry *geo = args->geo; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 289 | |
| 290 | /* |
Dave Chinner | 9f54180 | 2016-05-19 00:17:26 +1000 | [diff] [blame] | 291 | * If the caller just finished processing a buffer, it will tell us |
| 292 | * we need to trim that block out of the mapping now it is done. |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 293 | */ |
Dave Chinner | 9f54180 | 2016-05-19 00:17:26 +1000 | [diff] [blame] | 294 | if (trim_map) { |
Dave Chinner | d6cf130 | 2014-06-06 15:14:11 +1000 | [diff] [blame] | 295 | mip->map_blocks -= geo->fsbcount; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 296 | /* |
| 297 | * Loop to get rid of the extents for the |
| 298 | * directory block. |
| 299 | */ |
Dave Chinner | d6cf130 | 2014-06-06 15:14:11 +1000 | [diff] [blame] | 300 | for (i = geo->fsbcount; i > 0; ) { |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 301 | j = min_t(int, map->br_blockcount, i); |
| 302 | map->br_blockcount -= j; |
| 303 | map->br_startblock += j; |
| 304 | map->br_startoff += j; |
| 305 | /* |
| 306 | * If mapping is done, pitch it from |
| 307 | * the table. |
| 308 | */ |
| 309 | if (!map->br_blockcount && --mip->map_valid) |
| 310 | memmove(&map[0], &map[1], |
| 311 | sizeof(map[0]) * mip->map_valid); |
| 312 | i -= j; |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | /* |
| 317 | * Recalculate the readahead blocks wanted. |
| 318 | */ |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 319 | mip->ra_want = howmany(bufsize + geo->blksize, (1 << geo->fsblog)) - 1; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 320 | ASSERT(mip->ra_want >= 0); |
| 321 | |
| 322 | /* |
| 323 | * If we don't have as many as we want, and we haven't |
| 324 | * run out of data blocks, get some more mappings. |
| 325 | */ |
| 326 | if (1 + mip->ra_want > mip->map_blocks && |
Dave Chinner | 3002803 | 2014-06-06 15:08:18 +1000 | [diff] [blame] | 327 | mip->map_off < xfs_dir2_byte_to_da(geo, XFS_DIR2_LEAF_OFFSET)) { |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 328 | /* |
| 329 | * Get more bmaps, fill in after the ones |
| 330 | * we already have in the table. |
| 331 | */ |
| 332 | mip->nmap = mip->map_size - mip->map_valid; |
| 333 | error = xfs_bmapi_read(dp, mip->map_off, |
Dave Chinner | 3002803 | 2014-06-06 15:08:18 +1000 | [diff] [blame] | 334 | xfs_dir2_byte_to_da(geo, XFS_DIR2_LEAF_OFFSET) - |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 335 | mip->map_off, |
| 336 | &map[mip->map_valid], &mip->nmap, 0); |
| 337 | |
| 338 | /* |
| 339 | * Don't know if we should ignore this or try to return an |
| 340 | * error. The trouble with returning errors is that readdir |
| 341 | * will just stop without actually passing the error through. |
| 342 | */ |
| 343 | if (error) |
| 344 | goto out; /* XXX */ |
| 345 | |
| 346 | /* |
| 347 | * If we got all the mappings we asked for, set the final map |
| 348 | * offset based on the last bmap value received. Otherwise, |
| 349 | * we've reached the end. |
| 350 | */ |
| 351 | if (mip->nmap == mip->map_size - mip->map_valid) { |
| 352 | i = mip->map_valid + mip->nmap - 1; |
| 353 | mip->map_off = map[i].br_startoff + map[i].br_blockcount; |
| 354 | } else |
Dave Chinner | 3002803 | 2014-06-06 15:08:18 +1000 | [diff] [blame] | 355 | mip->map_off = xfs_dir2_byte_to_da(geo, |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 356 | XFS_DIR2_LEAF_OFFSET); |
| 357 | |
| 358 | /* |
| 359 | * Look for holes in the mapping, and eliminate them. Count up |
| 360 | * the valid blocks. |
| 361 | */ |
| 362 | for (i = mip->map_valid; i < mip->map_valid + mip->nmap; ) { |
| 363 | if (map[i].br_startblock == HOLESTARTBLOCK) { |
| 364 | mip->nmap--; |
| 365 | length = mip->map_valid + mip->nmap - i; |
| 366 | if (length) |
| 367 | memmove(&map[i], &map[i + 1], |
| 368 | sizeof(map[i]) * length); |
| 369 | } else { |
| 370 | mip->map_blocks += map[i].br_blockcount; |
| 371 | i++; |
| 372 | } |
| 373 | } |
| 374 | mip->map_valid += mip->nmap; |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * No valid mappings, so no more data blocks. |
| 379 | */ |
| 380 | if (!mip->map_valid) { |
Dave Chinner | 3002803 | 2014-06-06 15:08:18 +1000 | [diff] [blame] | 381 | *curoff = xfs_dir2_da_to_byte(geo, mip->map_off); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 382 | goto out; |
| 383 | } |
| 384 | |
| 385 | /* |
| 386 | * Read the directory block starting at the first mapping. |
| 387 | */ |
Dave Chinner | 3002803 | 2014-06-06 15:08:18 +1000 | [diff] [blame] | 388 | mip->curdb = xfs_dir2_da_to_db(geo, map->br_startoff); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 389 | error = xfs_dir3_data_read(NULL, dp, map->br_startoff, |
Dave Chinner | d6cf130 | 2014-06-06 15:14:11 +1000 | [diff] [blame] | 390 | map->br_blockcount >= geo->fsbcount ? |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 391 | XFS_FSB_TO_DADDR(dp->i_mount, map->br_startblock) : |
| 392 | -1, &bp); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 393 | /* |
| 394 | * Should just skip over the data block instead of giving up. |
| 395 | */ |
| 396 | if (error) |
| 397 | goto out; /* XXX */ |
| 398 | |
| 399 | /* |
| 400 | * Adjust the current amount of read-ahead: we just read a block that |
| 401 | * was previously ra. |
| 402 | */ |
| 403 | if (mip->ra_current) |
Dave Chinner | d6cf130 | 2014-06-06 15:14:11 +1000 | [diff] [blame] | 404 | mip->ra_current -= geo->fsbcount; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 405 | |
| 406 | /* |
| 407 | * Do we need more readahead? |
| 408 | */ |
| 409 | blk_start_plug(&plug); |
| 410 | for (mip->ra_index = mip->ra_offset = i = 0; |
| 411 | mip->ra_want > mip->ra_current && i < mip->map_blocks; |
Dave Chinner | d6cf130 | 2014-06-06 15:14:11 +1000 | [diff] [blame] | 412 | i += geo->fsbcount) { |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 413 | ASSERT(mip->ra_index < mip->map_valid); |
| 414 | /* |
| 415 | * Read-ahead a contiguous directory block. |
| 416 | */ |
| 417 | if (i > mip->ra_current && |
Dave Chinner | d6cf130 | 2014-06-06 15:14:11 +1000 | [diff] [blame] | 418 | map[mip->ra_index].br_blockcount >= geo->fsbcount) { |
Eric Sandeen | 9df2dd0 | 2014-04-14 19:01:59 +1000 | [diff] [blame] | 419 | xfs_dir3_data_readahead(dp, |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 420 | map[mip->ra_index].br_startoff + mip->ra_offset, |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 421 | XFS_FSB_TO_DADDR(dp->i_mount, |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 422 | map[mip->ra_index].br_startblock + |
| 423 | mip->ra_offset)); |
| 424 | mip->ra_current = i; |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * Read-ahead a non-contiguous directory block. This doesn't |
| 429 | * use our mapping, but this is a very rare case. |
| 430 | */ |
| 431 | else if (i > mip->ra_current) { |
Eric Sandeen | 9df2dd0 | 2014-04-14 19:01:59 +1000 | [diff] [blame] | 432 | xfs_dir3_data_readahead(dp, |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 433 | map[mip->ra_index].br_startoff + |
| 434 | mip->ra_offset, -1); |
| 435 | mip->ra_current = i; |
| 436 | } |
| 437 | |
| 438 | /* |
| 439 | * Advance offset through the mapping table. |
| 440 | */ |
Dave Chinner | d6cf130 | 2014-06-06 15:14:11 +1000 | [diff] [blame] | 441 | for (j = 0; j < geo->fsbcount; j += length ) { |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 442 | /* |
| 443 | * The rest of this extent but not more than a dir |
| 444 | * block. |
| 445 | */ |
Dave Chinner | d6cf130 | 2014-06-06 15:14:11 +1000 | [diff] [blame] | 446 | length = min_t(int, geo->fsbcount, |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 447 | map[mip->ra_index].br_blockcount - |
| 448 | mip->ra_offset); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 449 | mip->ra_offset += length; |
| 450 | |
| 451 | /* |
| 452 | * Advance to the next mapping if this one is used up. |
| 453 | */ |
| 454 | if (mip->ra_offset == map[mip->ra_index].br_blockcount) { |
| 455 | mip->ra_offset = 0; |
| 456 | mip->ra_index++; |
| 457 | } |
| 458 | } |
| 459 | } |
| 460 | blk_finish_plug(&plug); |
| 461 | |
| 462 | out: |
| 463 | *bpp = bp; |
| 464 | return error; |
| 465 | } |
| 466 | |
| 467 | /* |
| 468 | * Getdents (readdir) for leaf and node directories. |
| 469 | * This reads the data blocks only, so is the same for both forms. |
| 470 | */ |
| 471 | STATIC int |
| 472 | xfs_dir2_leaf_getdents( |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 473 | struct xfs_da_args *args, |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 474 | struct dir_context *ctx, |
| 475 | size_t bufsize) |
| 476 | { |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 477 | struct xfs_inode *dp = args->dp; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 478 | struct xfs_buf *bp = NULL; /* data block buffer */ |
| 479 | xfs_dir2_data_hdr_t *hdr; /* data block header */ |
| 480 | xfs_dir2_data_entry_t *dep; /* data entry */ |
| 481 | xfs_dir2_data_unused_t *dup; /* unused entry */ |
| 482 | int error = 0; /* error return value */ |
| 483 | int length; /* temporary length value */ |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 484 | int byteoff; /* offset in current block */ |
| 485 | xfs_dir2_off_t curoff; /* current overall offset */ |
| 486 | xfs_dir2_off_t newoff; /* new curoff after new blk */ |
| 487 | char *ptr = NULL; /* pointer to current data */ |
| 488 | struct xfs_dir2_leaf_map_info *map_info; |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 489 | struct xfs_da_geometry *geo = args->geo; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 490 | |
| 491 | /* |
| 492 | * If the offset is at or past the largest allowed value, |
| 493 | * give up right away. |
| 494 | */ |
| 495 | if (ctx->pos >= XFS_DIR2_MAX_DATAPTR) |
| 496 | return 0; |
| 497 | |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 498 | /* |
| 499 | * Set up to bmap a number of blocks based on the caller's |
| 500 | * buffer size, the directory block size, and the filesystem |
| 501 | * block size. |
| 502 | */ |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 503 | length = howmany(bufsize + geo->blksize, (1 << geo->fsblog)); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 504 | map_info = kmem_zalloc(offsetof(struct xfs_dir2_leaf_map_info, map) + |
| 505 | (length * sizeof(struct xfs_bmbt_irec)), |
| 506 | KM_SLEEP | KM_NOFS); |
| 507 | map_info->map_size = length; |
| 508 | |
| 509 | /* |
| 510 | * Inside the loop we keep the main offset value as a byte offset |
| 511 | * in the directory file. |
| 512 | */ |
Eric Sandeen | 2599405 | 2014-04-14 19:02:30 +1000 | [diff] [blame] | 513 | curoff = xfs_dir2_dataptr_to_byte(ctx->pos); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 514 | |
| 515 | /* |
| 516 | * Force this conversion through db so we truncate the offset |
| 517 | * down to get the start of the data block. |
| 518 | */ |
Dave Chinner | 3002803 | 2014-06-06 15:08:18 +1000 | [diff] [blame] | 519 | map_info->map_off = xfs_dir2_db_to_da(geo, |
| 520 | xfs_dir2_byte_to_db(geo, curoff)); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 521 | |
| 522 | /* |
| 523 | * Loop over directory entries until we reach the end offset. |
| 524 | * Get more blocks and readahead as necessary. |
| 525 | */ |
| 526 | while (curoff < XFS_DIR2_LEAF_OFFSET) { |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 527 | __uint8_t filetype; |
| 528 | |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 529 | /* |
| 530 | * If we have no buffer, or we're off the end of the |
| 531 | * current buffer, need to get another one. |
| 532 | */ |
Dave Chinner | 8f66193 | 2014-06-06 15:15:59 +1000 | [diff] [blame] | 533 | if (!bp || ptr >= (char *)bp->b_addr + geo->blksize) { |
Dave Chinner | dbad7c9 | 2015-08-19 10:33:00 +1000 | [diff] [blame] | 534 | int lock_mode; |
Dave Chinner | 9f54180 | 2016-05-19 00:17:26 +1000 | [diff] [blame] | 535 | bool trim_map = false; |
| 536 | |
| 537 | if (bp) { |
| 538 | xfs_trans_brelse(NULL, bp); |
| 539 | bp = NULL; |
| 540 | trim_map = true; |
| 541 | } |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 542 | |
Dave Chinner | dbad7c9 | 2015-08-19 10:33:00 +1000 | [diff] [blame] | 543 | lock_mode = xfs_ilock_data_map_shared(dp); |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 544 | error = xfs_dir2_leaf_readbuf(args, bufsize, map_info, |
Dave Chinner | 9f54180 | 2016-05-19 00:17:26 +1000 | [diff] [blame] | 545 | &curoff, &bp, trim_map); |
Dave Chinner | dbad7c9 | 2015-08-19 10:33:00 +1000 | [diff] [blame] | 546 | xfs_iunlock(dp, lock_mode); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 547 | if (error || !map_info->map_valid) |
| 548 | break; |
| 549 | |
| 550 | /* |
| 551 | * Having done a read, we need to set a new offset. |
| 552 | */ |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 553 | newoff = xfs_dir2_db_off_to_byte(geo, |
Dave Chinner | 9b3b552 | 2014-06-06 15:06:53 +1000 | [diff] [blame] | 554 | map_info->curdb, 0); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 555 | /* |
| 556 | * Start of the current block. |
| 557 | */ |
| 558 | if (curoff < newoff) |
| 559 | curoff = newoff; |
| 560 | /* |
| 561 | * Make sure we're in the right block. |
| 562 | */ |
| 563 | else if (curoff > newoff) |
Dave Chinner | 3002803 | 2014-06-06 15:08:18 +1000 | [diff] [blame] | 564 | ASSERT(xfs_dir2_byte_to_db(geo, curoff) == |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 565 | map_info->curdb); |
| 566 | hdr = bp->b_addr; |
| 567 | xfs_dir3_data_check(dp, bp); |
| 568 | /* |
| 569 | * Find our position in the block. |
| 570 | */ |
Dave Chinner | 2ca9877 | 2013-10-29 22:11:49 +1100 | [diff] [blame] | 571 | ptr = (char *)dp->d_ops->data_entry_p(hdr); |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 572 | byteoff = xfs_dir2_byte_to_off(geo, curoff); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 573 | /* |
| 574 | * Skip past the header. |
| 575 | */ |
| 576 | if (byteoff == 0) |
Dave Chinner | 1c9a5b2 | 2013-10-30 09:15:02 +1100 | [diff] [blame] | 577 | curoff += dp->d_ops->data_entry_offset; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 578 | /* |
| 579 | * Skip past entries until we reach our offset. |
| 580 | */ |
| 581 | else { |
| 582 | while ((char *)ptr - (char *)hdr < byteoff) { |
| 583 | dup = (xfs_dir2_data_unused_t *)ptr; |
| 584 | |
| 585 | if (be16_to_cpu(dup->freetag) |
| 586 | == XFS_DIR2_DATA_FREE_TAG) { |
| 587 | |
| 588 | length = be16_to_cpu(dup->length); |
| 589 | ptr += length; |
| 590 | continue; |
| 591 | } |
| 592 | dep = (xfs_dir2_data_entry_t *)ptr; |
| 593 | length = |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 594 | dp->d_ops->data_entsize(dep->namelen); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 595 | ptr += length; |
| 596 | } |
| 597 | /* |
| 598 | * Now set our real offset. |
| 599 | */ |
| 600 | curoff = |
Dave Chinner | 3002803 | 2014-06-06 15:08:18 +1000 | [diff] [blame] | 601 | xfs_dir2_db_off_to_byte(geo, |
| 602 | xfs_dir2_byte_to_db(geo, curoff), |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 603 | (char *)ptr - (char *)hdr); |
Dave Chinner | 8f66193 | 2014-06-06 15:15:59 +1000 | [diff] [blame] | 604 | if (ptr >= (char *)hdr + geo->blksize) { |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 605 | continue; |
| 606 | } |
| 607 | } |
| 608 | } |
| 609 | /* |
| 610 | * We have a pointer to an entry. |
| 611 | * Is it a live one? |
| 612 | */ |
| 613 | dup = (xfs_dir2_data_unused_t *)ptr; |
| 614 | /* |
| 615 | * No, it's unused, skip over it. |
| 616 | */ |
| 617 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { |
| 618 | length = be16_to_cpu(dup->length); |
| 619 | ptr += length; |
| 620 | curoff += length; |
| 621 | continue; |
| 622 | } |
| 623 | |
| 624 | dep = (xfs_dir2_data_entry_t *)ptr; |
Dave Chinner | 9d23fc8 | 2013-10-29 22:11:48 +1100 | [diff] [blame] | 625 | length = dp->d_ops->data_entsize(dep->namelen); |
| 626 | filetype = dp->d_ops->data_get_ftype(dep); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 627 | |
Eric Sandeen | 2599405 | 2014-04-14 19:02:30 +1000 | [diff] [blame] | 628 | ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 629 | if (!dir_emit(ctx, (char *)dep->name, dep->namelen, |
Dave Chinner | 0cb9776 | 2013-08-12 20:50:09 +1000 | [diff] [blame] | 630 | be64_to_cpu(dep->inumber), |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 631 | xfs_dir3_get_dtype(dp->i_mount, filetype))) |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 632 | break; |
| 633 | |
| 634 | /* |
| 635 | * Advance to next entry in the block. |
| 636 | */ |
| 637 | ptr += length; |
| 638 | curoff += length; |
| 639 | /* bufsize may have just been a guess; don't go negative */ |
| 640 | bufsize = bufsize > length ? bufsize - length : 0; |
| 641 | } |
| 642 | |
| 643 | /* |
| 644 | * All done. Set output offset value to current offset. |
| 645 | */ |
Eric Sandeen | 2599405 | 2014-04-14 19:02:30 +1000 | [diff] [blame] | 646 | if (curoff > xfs_dir2_dataptr_to_byte(XFS_DIR2_MAX_DATAPTR)) |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 647 | ctx->pos = XFS_DIR2_MAX_DATAPTR & 0x7fffffff; |
| 648 | else |
Eric Sandeen | 2599405 | 2014-04-14 19:02:30 +1000 | [diff] [blame] | 649 | ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 650 | kmem_free(map_info); |
| 651 | if (bp) |
| 652 | xfs_trans_brelse(NULL, bp); |
| 653 | return error; |
| 654 | } |
| 655 | |
| 656 | /* |
| 657 | * Read a directory. |
| 658 | */ |
| 659 | int |
| 660 | xfs_readdir( |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 661 | struct xfs_inode *dp, |
| 662 | struct dir_context *ctx, |
| 663 | size_t bufsize) |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 664 | { |
Dave Chinner | 35f46c5 | 2014-06-10 07:30:36 +1000 | [diff] [blame] | 665 | struct xfs_da_args args = { NULL }; |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 666 | int rval; |
| 667 | int v; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 668 | |
| 669 | trace_xfs_readdir(dp); |
| 670 | |
| 671 | if (XFS_FORCED_SHUTDOWN(dp->i_mount)) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 672 | return -EIO; |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 673 | |
Dave Chinner | c19b3b05 | 2016-02-09 16:54:58 +1100 | [diff] [blame] | 674 | ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); |
Bill O'Donnell | ff6d6af | 2015-10-12 18:21:22 +1100 | [diff] [blame] | 675 | XFS_STATS_INC(dp->i_mount, xs_dir_getdents); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 676 | |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 677 | args.dp = dp; |
| 678 | args.geo = dp->i_mount->m_dir_geo; |
| 679 | |
Dave Chinner | dbad7c9 | 2015-08-19 10:33:00 +1000 | [diff] [blame] | 680 | xfs_ilock(dp, XFS_IOLOCK_SHARED); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 681 | if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 682 | rval = xfs_dir2_sf_getdents(&args, ctx); |
| 683 | else if ((rval = xfs_dir2_isblock(&args, &v))) |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 684 | ; |
| 685 | else if (v) |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 686 | rval = xfs_dir2_block_getdents(&args, ctx); |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 687 | else |
Dave Chinner | 53f82db | 2014-06-06 15:20:32 +1000 | [diff] [blame] | 688 | rval = xfs_dir2_leaf_getdents(&args, ctx, bufsize); |
Dave Chinner | dbad7c9 | 2015-08-19 10:33:00 +1000 | [diff] [blame] | 689 | xfs_iunlock(dp, XFS_IOLOCK_SHARED); |
Ben Myers | 40194ec | 2013-12-06 12:30:11 -0800 | [diff] [blame] | 690 | |
Dave Chinner | 4a8af27 | 2013-08-12 20:49:36 +1000 | [diff] [blame] | 691 | return rval; |
| 692 | } |