Tao Ma | f56654c | 2008-08-18 17:38:48 +0800 | [diff] [blame^] | 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * xattr.c |
| 5 | * |
| 6 | * Copyright (C) 2008 Oracle. All rights reserved. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public |
| 10 | * License as published by the Free Software Foundation; either |
| 11 | * version 2 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public |
| 19 | * License along with this program; if not, write to the |
| 20 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | * Boston, MA 021110-1307, USA. |
| 22 | */ |
| 23 | |
| 24 | #define MLOG_MASK_PREFIX ML_XATTR |
| 25 | #include <cluster/masklog.h> |
| 26 | |
| 27 | #include "ocfs2.h" |
| 28 | #include "alloc.h" |
| 29 | #include "dlmglue.h" |
| 30 | #include "file.h" |
| 31 | #include "inode.h" |
| 32 | #include "journal.h" |
| 33 | #include "ocfs2_fs.h" |
| 34 | #include "suballoc.h" |
| 35 | #include "uptodate.h" |
| 36 | #include "buffer_head_io.h" |
| 37 | |
| 38 | static int ocfs2_xattr_extend_allocation(struct inode *inode, |
| 39 | u32 clusters_to_add, |
| 40 | struct buffer_head *xattr_bh, |
| 41 | struct ocfs2_xattr_value_root *xv) |
| 42 | { |
| 43 | int status = 0; |
| 44 | int restart_func = 0; |
| 45 | int credits = 0; |
| 46 | handle_t *handle = NULL; |
| 47 | struct ocfs2_alloc_context *data_ac = NULL; |
| 48 | struct ocfs2_alloc_context *meta_ac = NULL; |
| 49 | enum ocfs2_alloc_restarted why; |
| 50 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 51 | struct ocfs2_extent_list *root_el = &xv->xr_list; |
| 52 | u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters); |
| 53 | |
| 54 | mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add); |
| 55 | |
| 56 | restart_all: |
| 57 | |
| 58 | status = ocfs2_lock_allocators(inode, xattr_bh, root_el, |
| 59 | clusters_to_add, 0, &data_ac, |
| 60 | &meta_ac, OCFS2_XATTR_VALUE_EXTENT, xv); |
| 61 | if (status) { |
| 62 | mlog_errno(status); |
| 63 | goto leave; |
| 64 | } |
| 65 | |
| 66 | credits = ocfs2_calc_extend_credits(osb->sb, root_el, clusters_to_add); |
| 67 | handle = ocfs2_start_trans(osb, credits); |
| 68 | if (IS_ERR(handle)) { |
| 69 | status = PTR_ERR(handle); |
| 70 | handle = NULL; |
| 71 | mlog_errno(status); |
| 72 | goto leave; |
| 73 | } |
| 74 | |
| 75 | restarted_transaction: |
| 76 | status = ocfs2_journal_access(handle, inode, xattr_bh, |
| 77 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 78 | if (status < 0) { |
| 79 | mlog_errno(status); |
| 80 | goto leave; |
| 81 | } |
| 82 | |
| 83 | prev_clusters = le32_to_cpu(xv->xr_clusters); |
| 84 | status = ocfs2_add_clusters_in_btree(osb, |
| 85 | inode, |
| 86 | &logical_start, |
| 87 | clusters_to_add, |
| 88 | 0, |
| 89 | xattr_bh, |
| 90 | root_el, |
| 91 | handle, |
| 92 | data_ac, |
| 93 | meta_ac, |
| 94 | &why, |
| 95 | OCFS2_XATTR_VALUE_EXTENT, |
| 96 | xv); |
| 97 | if ((status < 0) && (status != -EAGAIN)) { |
| 98 | if (status != -ENOSPC) |
| 99 | mlog_errno(status); |
| 100 | goto leave; |
| 101 | } |
| 102 | |
| 103 | status = ocfs2_journal_dirty(handle, xattr_bh); |
| 104 | if (status < 0) { |
| 105 | mlog_errno(status); |
| 106 | goto leave; |
| 107 | } |
| 108 | |
| 109 | clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters; |
| 110 | |
| 111 | if (why != RESTART_NONE && clusters_to_add) { |
| 112 | if (why == RESTART_META) { |
| 113 | mlog(0, "restarting function.\n"); |
| 114 | restart_func = 1; |
| 115 | } else { |
| 116 | BUG_ON(why != RESTART_TRANS); |
| 117 | |
| 118 | mlog(0, "restarting transaction.\n"); |
| 119 | /* TODO: This can be more intelligent. */ |
| 120 | credits = ocfs2_calc_extend_credits(osb->sb, |
| 121 | root_el, |
| 122 | clusters_to_add); |
| 123 | status = ocfs2_extend_trans(handle, credits); |
| 124 | if (status < 0) { |
| 125 | /* handle still has to be committed at |
| 126 | * this point. */ |
| 127 | status = -ENOMEM; |
| 128 | mlog_errno(status); |
| 129 | goto leave; |
| 130 | } |
| 131 | goto restarted_transaction; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | leave: |
| 136 | if (handle) { |
| 137 | ocfs2_commit_trans(osb, handle); |
| 138 | handle = NULL; |
| 139 | } |
| 140 | if (data_ac) { |
| 141 | ocfs2_free_alloc_context(data_ac); |
| 142 | data_ac = NULL; |
| 143 | } |
| 144 | if (meta_ac) { |
| 145 | ocfs2_free_alloc_context(meta_ac); |
| 146 | meta_ac = NULL; |
| 147 | } |
| 148 | if ((!status) && restart_func) { |
| 149 | restart_func = 0; |
| 150 | goto restart_all; |
| 151 | } |
| 152 | |
| 153 | return status; |
| 154 | } |
| 155 | |
| 156 | static int __ocfs2_remove_xattr_range(struct inode *inode, |
| 157 | struct buffer_head *root_bh, |
| 158 | struct ocfs2_xattr_value_root *xv, |
| 159 | u32 cpos, u32 phys_cpos, u32 len, |
| 160 | struct ocfs2_cached_dealloc_ctxt *dealloc) |
| 161 | { |
| 162 | int ret; |
| 163 | u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); |
| 164 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 165 | struct inode *tl_inode = osb->osb_tl_inode; |
| 166 | handle_t *handle; |
| 167 | struct ocfs2_alloc_context *meta_ac = NULL; |
| 168 | |
| 169 | ret = ocfs2_lock_allocators(inode, root_bh, &xv->xr_list, |
| 170 | 0, 1, NULL, &meta_ac, |
| 171 | OCFS2_XATTR_VALUE_EXTENT, xv); |
| 172 | if (ret) { |
| 173 | mlog_errno(ret); |
| 174 | return ret; |
| 175 | } |
| 176 | |
| 177 | mutex_lock(&tl_inode->i_mutex); |
| 178 | |
| 179 | if (ocfs2_truncate_log_needs_flush(osb)) { |
| 180 | ret = __ocfs2_flush_truncate_log(osb); |
| 181 | if (ret < 0) { |
| 182 | mlog_errno(ret); |
| 183 | goto out; |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); |
| 188 | if (IS_ERR(handle)) { |
| 189 | ret = PTR_ERR(handle); |
| 190 | mlog_errno(ret); |
| 191 | goto out; |
| 192 | } |
| 193 | |
| 194 | ret = ocfs2_journal_access(handle, inode, root_bh, |
| 195 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 196 | if (ret) { |
| 197 | mlog_errno(ret); |
| 198 | goto out_commit; |
| 199 | } |
| 200 | |
| 201 | ret = ocfs2_remove_extent(inode, root_bh, cpos, len, handle, meta_ac, |
| 202 | dealloc, OCFS2_XATTR_VALUE_EXTENT, xv); |
| 203 | if (ret) { |
| 204 | mlog_errno(ret); |
| 205 | goto out_commit; |
| 206 | } |
| 207 | |
| 208 | le32_add_cpu(&xv->xr_clusters, -len); |
| 209 | |
| 210 | ret = ocfs2_journal_dirty(handle, root_bh); |
| 211 | if (ret) { |
| 212 | mlog_errno(ret); |
| 213 | goto out_commit; |
| 214 | } |
| 215 | |
| 216 | ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len); |
| 217 | if (ret) |
| 218 | mlog_errno(ret); |
| 219 | |
| 220 | out_commit: |
| 221 | ocfs2_commit_trans(osb, handle); |
| 222 | out: |
| 223 | mutex_unlock(&tl_inode->i_mutex); |
| 224 | |
| 225 | if (meta_ac) |
| 226 | ocfs2_free_alloc_context(meta_ac); |
| 227 | |
| 228 | return ret; |
| 229 | } |
| 230 | |
| 231 | static int ocfs2_xattr_shrink_size(struct inode *inode, |
| 232 | u32 old_clusters, |
| 233 | u32 new_clusters, |
| 234 | struct buffer_head *root_bh, |
| 235 | struct ocfs2_xattr_value_root *xv) |
| 236 | { |
| 237 | int ret = 0; |
| 238 | u32 trunc_len, cpos, phys_cpos, alloc_size; |
| 239 | u64 block; |
| 240 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 241 | struct ocfs2_cached_dealloc_ctxt dealloc; |
| 242 | |
| 243 | ocfs2_init_dealloc_ctxt(&dealloc); |
| 244 | |
| 245 | if (old_clusters <= new_clusters) |
| 246 | return 0; |
| 247 | |
| 248 | cpos = new_clusters; |
| 249 | trunc_len = old_clusters - new_clusters; |
| 250 | while (trunc_len) { |
| 251 | ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos, |
| 252 | &alloc_size, &xv->xr_list); |
| 253 | if (ret) { |
| 254 | mlog_errno(ret); |
| 255 | goto out; |
| 256 | } |
| 257 | |
| 258 | if (alloc_size > trunc_len) |
| 259 | alloc_size = trunc_len; |
| 260 | |
| 261 | ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos, |
| 262 | phys_cpos, alloc_size, |
| 263 | &dealloc); |
| 264 | if (ret) { |
| 265 | mlog_errno(ret); |
| 266 | goto out; |
| 267 | } |
| 268 | |
| 269 | block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); |
| 270 | ocfs2_remove_xattr_clusters_from_cache(inode, block, |
| 271 | alloc_size); |
| 272 | cpos += alloc_size; |
| 273 | trunc_len -= alloc_size; |
| 274 | } |
| 275 | |
| 276 | out: |
| 277 | ocfs2_schedule_truncate_log_flush(osb, 1); |
| 278 | ocfs2_run_deallocs(osb, &dealloc); |
| 279 | |
| 280 | return ret; |
| 281 | } |
| 282 | |
| 283 | static int ocfs2_xattr_value_truncate(struct inode *inode, |
| 284 | struct buffer_head *root_bh, |
| 285 | struct ocfs2_xattr_value_root *xv, |
| 286 | int len) |
| 287 | { |
| 288 | int ret; |
| 289 | u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len); |
| 290 | u32 old_clusters = le32_to_cpu(xv->xr_clusters); |
| 291 | |
| 292 | if (new_clusters == old_clusters) |
| 293 | return 0; |
| 294 | |
| 295 | if (new_clusters > old_clusters) |
| 296 | ret = ocfs2_xattr_extend_allocation(inode, |
| 297 | new_clusters - old_clusters, |
| 298 | root_bh, xv); |
| 299 | else |
| 300 | ret = ocfs2_xattr_shrink_size(inode, |
| 301 | old_clusters, new_clusters, |
| 302 | root_bh, xv); |
| 303 | |
| 304 | return ret; |
| 305 | } |