fs/f2fs/inode.c

   1 /*
   2  * fs/f2fs/inode.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/fs.h>
  12 #include <linux/f2fs_fs.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/writeback.h>
  15
  16 #include "f2fs.h"
  17 #include "node.h"
  18
  19 #include <trace/events/f2fs.h>
  20
  21 void f2fs_set_inode_flags(struct inode *inode)
  22 {
  23         unsigned int flags = F2FS_I(inode)->i_flags;
  24         unsigned int new_fl = 0;
  25
  26         if (flags & FS_SYNC_FL)
  27                 new_fl |= S_SYNC;
  28         if (flags & FS_APPEND_FL)
  29                 new_fl |= S_APPEND;
  30         if (flags & FS_IMMUTABLE_FL)
  31                 new_fl |= S_IMMUTABLE;
  32         if (flags & FS_NOATIME_FL)
  33                 new_fl |= S_NOATIME;
  34         if (flags & FS_DIRSYNC_FL)
  35                 new_fl |= S_DIRSYNC;
  36         inode_set_flags(inode, new_fl,
  37                         S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
  38         mark_inode_dirty_sync(inode);
  39 }
  40
  41 static void __get_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
  42 {
  43         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
  44                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
  45                 if (ri->i_addr[0])
  46                         inode->i_rdev =
  47                                 old_decode_dev(le32_to_cpu(ri->i_addr[0]));
  48                 else
  49                         inode->i_rdev =
  50                                 new_decode_dev(le32_to_cpu(ri->i_addr[1]));
  51         }
  52 }
  53
  54 static bool __written_first_block(struct f2fs_inode *ri)
  55 {
  56         block_t addr = le32_to_cpu(ri->i_addr[0]);
  57
  58         if (addr != NEW_ADDR && addr != NULL_ADDR)
  59                 return true;
  60         return false;
  61 }
  62
  63 static void __set_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
  64 {
  65         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
  66                 if (old_valid_dev(inode->i_rdev)) {
  67                         ri->i_addr[0] =
  68                                 cpu_to_le32(old_encode_dev(inode->i_rdev));
  69                         ri->i_addr[1] = 0;
  70                 } else {
  71                         ri->i_addr[0] = 0;
  72                         ri->i_addr[1] =
  73                                 cpu_to_le32(new_encode_dev(inode->i_rdev));
  74                         ri->i_addr[2] = 0;
  75                 }
  76         }
  77 }
  78
  79 static void __recover_inline_status(struct inode *inode, struct page *ipage)
  80 {
  81         void *inline_data = inline_data_addr(ipage);
  82         __le32 *start = inline_data;
  83         __le32 *end = start + MAX_INLINE_DATA / sizeof(__le32);
  84
  85         while (start < end) {
  86                 if (*start++) {
  87                         f2fs_wait_on_page_writeback(ipage, NODE, true);
  88
  89                         set_inode_flag(inode, FI_DATA_EXIST);
  90                         set_raw_inline(inode, F2FS_INODE(ipage));
  91                         set_page_dirty(ipage);
  92                         return;
  93                 }
  94         }
  95         return;
  96 }
  97
  98 static int do_read_inode(struct inode *inode)
  99 {
 100         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 101         struct f2fs_inode_info *fi = F2FS_I(inode);
 102         struct page *node_page;
 103         struct f2fs_inode *ri;
 104
 105         /* Check if ino is within scope */
 106         if (check_nid_range(sbi, inode->i_ino)) {
 107                 f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
 108                          (unsigned long) inode->i_ino);
 109                 WARN_ON(1);
 110                 return -EINVAL;
 111         }
 112
 113         node_page = get_node_page(sbi, inode->i_ino);
 114         if (IS_ERR(node_page))
 115                 return PTR_ERR(node_page);
 116
 117         ri = F2FS_INODE(node_page);
 118
 119         inode->i_mode = le16_to_cpu(ri->i_mode);
 120         i_uid_write(inode, le32_to_cpu(ri->i_uid));
 121         i_gid_write(inode, le32_to_cpu(ri->i_gid));
 122         set_nlink(inode, le32_to_cpu(ri->i_links));
 123         inode->i_size = le64_to_cpu(ri->i_size);
 124         inode->i_blocks = le64_to_cpu(ri->i_blocks);
 125
 126         inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
 127         inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
 128         inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
 129         inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
 130         inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
 131         inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
 132         inode->i_generation = le32_to_cpu(ri->i_generation);
 133
 134         fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
 135         fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
 136         fi->i_flags = le32_to_cpu(ri->i_flags);
 137         fi->flags = 0;
 138         fi->i_advise = ri->i_advise;
 139         fi->i_pino = le32_to_cpu(ri->i_pino);
 140         fi->i_dir_level = ri->i_dir_level;
 141
 142         if (f2fs_init_extent_tree(inode, &ri->i_ext))
 143                 set_page_dirty(node_page);
 144
 145         get_inline_info(inode, ri);
 146
 147         /* check data exist */
 148         if (f2fs_has_inline_data(inode) && !f2fs_exist_data(inode))
 149                 __recover_inline_status(inode, node_page);
 150
 151         /* get rdev by using inline_info */
 152         __get_inode_rdev(inode, ri);
 153
 154         if (__written_first_block(ri))
 155                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
 156
 157         f2fs_put_page(node_page, 1);
 158
 159         stat_inc_inline_xattr(inode);
 160         stat_inc_inline_inode(inode);
 161         stat_inc_inline_dir(inode);
 162
 163         return 0;
 164 }
 165
 166 struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
 167 {
 168         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 169         struct inode *inode;
 170         int ret = 0;
 171
 172         inode = iget_locked(sb, ino);
 173         if (!inode)
 174                 return ERR_PTR(-ENOMEM);
 175
 176         if (!(inode->i_state & I_NEW)) {
 177                 trace_f2fs_iget(inode);
 178                 return inode;
 179         }
 180         if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
 181                 goto make_now;
 182
 183         ret = do_read_inode(inode);
 184         if (ret)
 185                 goto bad_inode;
 186 make_now:
 187         if (ino == F2FS_NODE_INO(sbi)) {
 188                 inode->i_mapping->a_ops = &f2fs_node_aops;
 189                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 190         } else if (ino == F2FS_META_INO(sbi)) {
 191                 inode->i_mapping->a_ops = &f2fs_meta_aops;
 192                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 193         } else if (S_ISREG(inode->i_mode)) {
 194                 inode->i_op = &f2fs_file_inode_operations;
 195                 inode->i_fop = &f2fs_file_operations;
 196                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 197         } else if (S_ISDIR(inode->i_mode)) {
 198                 inode->i_op = &f2fs_dir_inode_operations;
 199                 inode->i_fop = &f2fs_dir_operations;
 200                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 201                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 202         } else if (S_ISLNK(inode->i_mode)) {
 203                 if (f2fs_encrypted_inode(inode))
 204                         inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 205                 else
 206                         inode->i_op = &f2fs_symlink_inode_operations;
 207                 inode_nohighmem(inode);
 208                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 209         } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 210                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 211                 inode->i_op = &f2fs_special_inode_operations;
 212                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 213         } else {
 214                 ret = -EIO;
 215                 goto bad_inode;
 216         }
 217         unlock_new_inode(inode);
 218         trace_f2fs_iget(inode);
 219         return inode;
 220
 221 bad_inode:
 222         iget_failed(inode);
 223         trace_f2fs_iget_exit(inode, ret);
 224         return ERR_PTR(ret);
 225 }
 226
 227 int update_inode(struct inode *inode, struct page *node_page)
 228 {
 229         struct f2fs_inode *ri;
 230
 231         f2fs_wait_on_page_writeback(node_page, NODE, true);
 232
 233         ri = F2FS_INODE(node_page);
 234
 235         ri->i_mode = cpu_to_le16(inode->i_mode);
 236         ri->i_advise = F2FS_I(inode)->i_advise;
 237         ri->i_uid = cpu_to_le32(i_uid_read(inode));
 238         ri->i_gid = cpu_to_le32(i_gid_read(inode));
 239         ri->i_links = cpu_to_le32(inode->i_nlink);
 240         ri->i_size = cpu_to_le64(i_size_read(inode));
 241         ri->i_blocks = cpu_to_le64(inode->i_blocks);
 242
 243         if (F2FS_I(inode)->extent_tree)
 244                 set_raw_extent(&F2FS_I(inode)->extent_tree->largest,
 245                                                         &ri->i_ext);
 246         else
 247                 memset(&ri->i_ext, 0, sizeof(ri->i_ext));
 248         set_raw_inline(inode, ri);
 249
 250         ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 251         ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 252         ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 253         ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 254         ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 255         ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 256         ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
 257         ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
 258         ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
 259         ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
 260         ri->i_generation = cpu_to_le32(inode->i_generation);
 261         ri->i_dir_level = F2FS_I(inode)->i_dir_level;
 262
 263         __set_inode_rdev(inode, ri);
 264         set_cold_node(inode, node_page);
 265         f2fs_inode_synced(inode);
 266
 267         /* deleted inode */
 268         if (inode->i_nlink == 0)
 269                 clear_inline_node(node_page);
 270
 271         return set_page_dirty(node_page);
 272 }
 273
 274 int update_inode_page(struct inode *inode)
 275 {
 276         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 277         struct page *node_page;
 278         int ret = 0;
 279 retry:
 280         node_page = get_node_page(sbi, inode->i_ino);
 281         if (IS_ERR(node_page)) {
 282                 int err = PTR_ERR(node_page);
 283                 if (err == -ENOMEM) {
 284                         cond_resched();
 285                         goto retry;
 286                 } else if (err != -ENOENT) {
 287                         f2fs_stop_checkpoint(sbi, false);
 288                 }
 289                 f2fs_inode_synced(inode);
 290                 return 0;
 291         }
 292         ret = update_inode(inode, node_page);
 293         f2fs_put_page(node_page, 1);
 294         return ret;
 295 }
 296
 297 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 298 {
 299         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 300
 301         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 302                         inode->i_ino == F2FS_META_INO(sbi))
 303                 return 0;
 304
 305         if (!is_inode_flag_set(inode, FI_DIRTY_INODE))
 306                 return 0;
 307
 308         /*
 309          * We need to balance fs here to prevent from producing dirty node pages
 310          * during the urgent cleaning time when runing out of free sections.
 311          */
 312         if (update_inode_page(inode))
 313                 f2fs_balance_fs(sbi, true);
 314         return 0;
 315 }
 316
 317 /*
 318  * Called at the last iput() if i_nlink is zero
 319  */
 320 void f2fs_evict_inode(struct inode *inode)
 321 {
 322         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 323         nid_t xnid = F2FS_I(inode)->i_xattr_nid;
 324         int err = 0;
 325
 326         /* some remained atomic pages should discarded */
 327         if (f2fs_is_atomic_file(inode))
 328                 drop_inmem_pages(inode);
 329
 330         trace_f2fs_evict_inode(inode);
 331         truncate_inode_pages_final(&inode->i_data);
 332
 333         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 334                         inode->i_ino == F2FS_META_INO(sbi))
 335                 goto out_clear;
 336
 337         f2fs_bug_on(sbi, get_dirty_pages(inode));
 338         remove_dirty_inode(inode);
 339
 340         f2fs_destroy_extent_tree(inode);
 341
 342         if (inode->i_nlink || is_bad_inode(inode))
 343                 goto no_delete;
 344
 345         sb_start_intwrite(inode->i_sb);
 346         set_inode_flag(inode, FI_NO_ALLOC);
 347         i_size_write(inode, 0);
 348 retry:
 349         if (F2FS_HAS_BLOCKS(inode))
 350                 err = f2fs_truncate(inode, true);
 351
 352         if (!err) {
 353                 f2fs_lock_op(sbi);
 354                 err = remove_inode_page(inode);
 355                 f2fs_unlock_op(sbi);
 356         }
 357
 358         /* give more chances, if ENOMEM case */
 359         if (err == -ENOMEM) {
 360                 err = 0;
 361                 goto retry;
 362         }
 363
 364         if (err)
 365                 update_inode_page(inode);
 366         sb_end_intwrite(inode->i_sb);
 367 no_delete:
 368         stat_dec_inline_xattr(inode);
 369         stat_dec_inline_dir(inode);
 370         stat_dec_inline_inode(inode);
 371
 372         invalidate_mapping_pages(NODE_MAPPING(sbi), inode->i_ino, inode->i_ino);
 373         if (xnid)
 374                 invalidate_mapping_pages(NODE_MAPPING(sbi), xnid, xnid);
 375         if (is_inode_flag_set(inode, FI_APPEND_WRITE))
 376                 add_ino_entry(sbi, inode->i_ino, APPEND_INO);
 377         if (is_inode_flag_set(inode, FI_UPDATE_WRITE))
 378                 add_ino_entry(sbi, inode->i_ino, UPDATE_INO);
 379         if (is_inode_flag_set(inode, FI_FREE_NID)) {
 380                 alloc_nid_failed(sbi, inode->i_ino);
 381                 clear_inode_flag(inode, FI_FREE_NID);
 382         }
 383         f2fs_bug_on(sbi, err &&
 384                 !exist_written_data(sbi, inode->i_ino, ORPHAN_INO));
 385 out_clear:
 386         fscrypt_put_encryption_info(inode, NULL);
 387
 388         f2fs_bug_on(sbi, is_inode_flag_set(inode, FI_DIRTY_INODE));
 389         clear_inode(inode);
 390 }
 391
 392 /* caller should call f2fs_lock_op() */
 393 void handle_failed_inode(struct inode *inode)
 394 {
 395         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 396         struct node_info ni;
 397
 398         /* don't make bad inode, since it becomes a regular file. */
 399         unlock_new_inode(inode);
 400
 401         /*
 402          * Note: we should add inode to orphan list before f2fs_unlock_op()
 403          * so we can prevent losing this orphan when encoutering checkpoint
 404          * and following suddenly power-off.
 405          */
 406         get_node_info(sbi, inode->i_ino, &ni);
 407
 408         if (ni.blk_addr != NULL_ADDR) {
 409                 int err = acquire_orphan_inode(sbi);
 410                 if (err) {
 411                         set_sbi_flag(sbi, SBI_NEED_FSCK);
 412                         f2fs_msg(sbi->sb, KERN_WARNING,
 413                                 "Too many orphan inodes, run fsck to fix.");
 414                 } else {
 415                         add_orphan_inode(sbi, inode->i_ino);
 416                 }
 417                 alloc_nid_done(sbi, inode->i_ino);
 418         } else {
 419                 set_inode_flag(inode, FI_FREE_NID);
 420         }
 421
 422         f2fs_unlock_op(sbi);
 423
 424         /* iput will drop the inode object */
 425         iput(inode);
 426 }