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 }
  39
  40 static void __get_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
  41 {
  42         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
  43                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
  44                 if (ri->i_addr[0])
  45                         inode->i_rdev =
  46                                 old_decode_dev(le32_to_cpu(ri->i_addr[0]));
  47                 else
  48                         inode->i_rdev =
  49                                 new_decode_dev(le32_to_cpu(ri->i_addr[1]));
  50         }
  51 }
  52
  53 static bool __written_first_block(struct f2fs_inode *ri)
  54 {
  55         block_t addr = le32_to_cpu(ri->i_addr[0]);
  56
  57         if (addr != NEW_ADDR && addr != NULL_ADDR)
  58                 return true;
  59         return false;
  60 }
  61
  62 static void __set_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
  63 {
  64         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
  65                 if (old_valid_dev(inode->i_rdev)) {
  66                         ri->i_addr[0] =
  67                                 cpu_to_le32(old_encode_dev(inode->i_rdev));
  68                         ri->i_addr[1] = 0;
  69                 } else {
  70                         ri->i_addr[0] = 0;
  71                         ri->i_addr[1] =
  72                                 cpu_to_le32(new_encode_dev(inode->i_rdev));
  73                         ri->i_addr[2] = 0;
  74                 }
  75         }
  76 }
  77
  78 static void __recover_inline_status(struct inode *inode, struct page *ipage)
  79 {
  80         void *inline_data = inline_data_addr(ipage);
  81         __le32 *start = inline_data;
  82         __le32 *end = start + MAX_INLINE_DATA / sizeof(__le32);
  83
  84         while (start < end) {
  85                 if (*start++) {
  86                         f2fs_wait_on_page_writeback(ipage, NODE);
  87
  88                         set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
  89                         set_raw_inline(F2FS_I(inode), F2FS_INODE(ipage));
  90                         set_page_dirty(ipage);
  91                         return;
  92                 }
  93         }
  94         return;
  95 }
  96
  97 static int do_read_inode(struct inode *inode)
  98 {
  99         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 100         struct f2fs_inode_info *fi = F2FS_I(inode);
 101         struct page *node_page;
 102         struct f2fs_inode *ri;
 103
 104         /* Check if ino is within scope */
 105         if (check_nid_range(sbi, inode->i_ino)) {
 106                 f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
 107                          (unsigned long) inode->i_ino);
 108                 WARN_ON(1);
 109                 return -EINVAL;
 110         }
 111
 112         node_page = get_node_page(sbi, inode->i_ino);
 113         if (IS_ERR(node_page))
 114                 return PTR_ERR(node_page);
 115
 116         ri = F2FS_INODE(node_page);
 117
 118         inode->i_mode = le16_to_cpu(ri->i_mode);
 119         i_uid_write(inode, le32_to_cpu(ri->i_uid));
 120         i_gid_write(inode, le32_to_cpu(ri->i_gid));
 121         set_nlink(inode, le32_to_cpu(ri->i_links));
 122         inode->i_size = le64_to_cpu(ri->i_size);
 123         inode->i_blocks = le64_to_cpu(ri->i_blocks);
 124
 125         inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
 126         inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
 127         inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
 128         inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
 129         inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
 130         inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
 131         inode->i_generation = le32_to_cpu(ri->i_generation);
 132
 133         fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
 134         fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
 135         fi->i_flags = le32_to_cpu(ri->i_flags);
 136         fi->flags = 0;
 137         fi->i_advise = ri->i_advise;
 138         fi->i_pino = le32_to_cpu(ri->i_pino);
 139         fi->i_dir_level = ri->i_dir_level;
 140
 141         if (f2fs_init_extent_tree(inode, &ri->i_ext))
 142                 set_page_dirty(node_page);
 143
 144         get_inline_info(fi, ri);
 145
 146         /* check data exist */
 147         if (f2fs_has_inline_data(inode) && !f2fs_exist_data(inode))
 148                 __recover_inline_status(inode, node_page);
 149
 150         /* get rdev by using inline_info */
 151         __get_inode_rdev(inode, ri);
 152
 153         if (__written_first_block(ri))
 154                 set_inode_flag(F2FS_I(inode), FI_FIRST_BLOCK_WRITTEN);
 155
 156         f2fs_put_page(node_page, 1);
 157
 158         stat_inc_inline_xattr(inode);
 159         stat_inc_inline_inode(inode);
 160         stat_inc_inline_dir(inode);
 161
 162         return 0;
 163 }
 164
 165 struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
 166 {
 167         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 168         struct inode *inode;
 169         int ret = 0;
 170
 171         inode = iget_locked(sb, ino);
 172         if (!inode)
 173                 return ERR_PTR(-ENOMEM);
 174
 175         if (!(inode->i_state & I_NEW)) {
 176                 trace_f2fs_iget(inode);
 177                 return inode;
 178         }
 179         if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
 180                 goto make_now;
 181
 182         ret = do_read_inode(inode);
 183         if (ret)
 184                 goto bad_inode;
 185 make_now:
 186         if (ino == F2FS_NODE_INO(sbi)) {
 187                 inode->i_mapping->a_ops = &f2fs_node_aops;
 188                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 189         } else if (ino == F2FS_META_INO(sbi)) {
 190                 inode->i_mapping->a_ops = &f2fs_meta_aops;
 191                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 192         } else if (S_ISREG(inode->i_mode)) {
 193                 inode->i_op = &f2fs_file_inode_operations;
 194                 inode->i_fop = &f2fs_file_operations;
 195                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 196         } else if (S_ISDIR(inode->i_mode)) {
 197                 inode->i_op = &f2fs_dir_inode_operations;
 198                 inode->i_fop = &f2fs_dir_operations;
 199                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 200                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 201         } else if (S_ISLNK(inode->i_mode)) {
 202                 if (f2fs_encrypted_inode(inode))
 203                         inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 204                 else
 205                         inode->i_op = &f2fs_symlink_inode_operations;
 206                 inode_nohighmem(inode);
 207                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 208         } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 209                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 210                 inode->i_op = &f2fs_special_inode_operations;
 211                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 212         } else {
 213                 ret = -EIO;
 214                 goto bad_inode;
 215         }
 216         unlock_new_inode(inode);
 217         trace_f2fs_iget(inode);
 218         return inode;
 219
 220 bad_inode:
 221         iget_failed(inode);
 222         trace_f2fs_iget_exit(inode, ret);
 223         return ERR_PTR(ret);
 224 }
 225
 226 int update_inode(struct inode *inode, struct page *node_page)
 227 {
 228         struct f2fs_inode *ri;
 229
 230         f2fs_wait_on_page_writeback(node_page, NODE);
 231
 232         ri = F2FS_INODE(node_page);
 233
 234         ri->i_mode = cpu_to_le16(inode->i_mode);
 235         ri->i_advise = F2FS_I(inode)->i_advise;
 236         ri->i_uid = cpu_to_le32(i_uid_read(inode));
 237         ri->i_gid = cpu_to_le32(i_gid_read(inode));
 238         ri->i_links = cpu_to_le32(inode->i_nlink);
 239         ri->i_size = cpu_to_le64(i_size_read(inode));
 240         ri->i_blocks = cpu_to_le64(inode->i_blocks);
 241
 242         if (F2FS_I(inode)->extent_tree)
 243                 set_raw_extent(&F2FS_I(inode)->extent_tree->largest,
 244                                                         &ri->i_ext);
 245         else
 246                 memset(&ri->i_ext, 0, sizeof(ri->i_ext));
 247         set_raw_inline(F2FS_I(inode), ri);
 248
 249         ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 250         ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 251         ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 252         ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 253         ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 254         ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 255         ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
 256         ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
 257         ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
 258         ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
 259         ri->i_generation = cpu_to_le32(inode->i_generation);
 260         ri->i_dir_level = F2FS_I(inode)->i_dir_level;
 261
 262         __set_inode_rdev(inode, ri);
 263         set_cold_node(inode, node_page);
 264         clear_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 265
 266         return set_page_dirty(node_page);
 267 }
 268
 269 int update_inode_page(struct inode *inode)
 270 {
 271         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 272         struct page *node_page;
 273         int ret = 0;
 274 retry:
 275         node_page = get_node_page(sbi, inode->i_ino);
 276         if (IS_ERR(node_page)) {
 277                 int err = PTR_ERR(node_page);
 278                 if (err == -ENOMEM) {
 279                         cond_resched();
 280                         goto retry;
 281                 } else if (err != -ENOENT) {
 282                         f2fs_stop_checkpoint(sbi);
 283                 }
 284                 return 0;
 285         }
 286         ret = update_inode(inode, node_page);
 287         f2fs_put_page(node_page, 1);
 288         return ret;
 289 }
 290
 291 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 292 {
 293         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 294
 295         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 296                         inode->i_ino == F2FS_META_INO(sbi))
 297                 return 0;
 298
 299         if (!is_inode_flag_set(F2FS_I(inode), FI_DIRTY_INODE))
 300                 return 0;
 301
 302         /*
 303          * We need to balance fs here to prevent from producing dirty node pages
 304          * during the urgent cleaning time when runing out of free sections.
 305          */
 306         if (update_inode_page(inode))
 307                 f2fs_balance_fs(sbi, true);
 308         return 0;
 309 }
 310
 311 /*
 312  * Called at the last iput() if i_nlink is zero
 313  */
 314 void f2fs_evict_inode(struct inode *inode)
 315 {
 316         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 317         struct f2fs_inode_info *fi = F2FS_I(inode);
 318         nid_t xnid = fi->i_xattr_nid;
 319         int err = 0;
 320
 321         /* some remained atomic pages should discarded */
 322         if (f2fs_is_atomic_file(inode))
 323                 commit_inmem_pages(inode, true);
 324
 325         trace_f2fs_evict_inode(inode);
 326         truncate_inode_pages_final(&inode->i_data);
 327
 328         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 329                         inode->i_ino == F2FS_META_INO(sbi))
 330                 goto out_clear;
 331
 332         f2fs_bug_on(sbi, get_dirty_pages(inode));
 333         remove_dirty_inode(inode);
 334
 335         f2fs_destroy_extent_tree(inode);
 336
 337         if (inode->i_nlink || is_bad_inode(inode))
 338                 goto no_delete;
 339
 340         sb_start_intwrite(inode->i_sb);
 341         set_inode_flag(fi, FI_NO_ALLOC);
 342         i_size_write(inode, 0);
 343
 344         if (F2FS_HAS_BLOCKS(inode))
 345                 err = f2fs_truncate(inode, true);
 346
 347         if (!err) {
 348                 f2fs_lock_op(sbi);
 349                 err = remove_inode_page(inode);
 350                 f2fs_unlock_op(sbi);
 351         }
 352
 353         sb_end_intwrite(inode->i_sb);
 354 no_delete:
 355         stat_dec_inline_xattr(inode);
 356         stat_dec_inline_dir(inode);
 357         stat_dec_inline_inode(inode);
 358
 359         invalidate_mapping_pages(NODE_MAPPING(sbi), inode->i_ino, inode->i_ino);
 360         if (xnid)
 361                 invalidate_mapping_pages(NODE_MAPPING(sbi), xnid, xnid);
 362         if (is_inode_flag_set(fi, FI_APPEND_WRITE))
 363                 add_ino_entry(sbi, inode->i_ino, APPEND_INO);
 364         if (is_inode_flag_set(fi, FI_UPDATE_WRITE))
 365                 add_ino_entry(sbi, inode->i_ino, UPDATE_INO);
 366         if (is_inode_flag_set(fi, FI_FREE_NID)) {
 367                 if (err && err != -ENOENT)
 368                         alloc_nid_done(sbi, inode->i_ino);
 369                 else
 370                         alloc_nid_failed(sbi, inode->i_ino);
 371                 clear_inode_flag(fi, FI_FREE_NID);
 372         }
 373
 374         if (err && err != -ENOENT) {
 375                 if (!exist_written_data(sbi, inode->i_ino, ORPHAN_INO)) {
 376                         /*
 377                          * get here because we failed to release resource
 378                          * of inode previously, reminder our user to run fsck
 379                          * for fixing.
 380                          */
 381                         set_sbi_flag(sbi, SBI_NEED_FSCK);
 382                         f2fs_msg(sbi->sb, KERN_WARNING,
 383                                 "inode (ino:%lu) resource leak, run fsck "
 384                                 "to fix this issue!", inode->i_ino);
 385                 }
 386         }
 387 out_clear:
 388 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 389         if (fi->i_crypt_info)
 390                 f2fs_free_encryption_info(inode, fi->i_crypt_info);
 391 #endif
 392         clear_inode(inode);
 393 }
 394
 395 /* caller should call f2fs_lock_op() */
 396 void handle_failed_inode(struct inode *inode)
 397 {
 398         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 399         int err = 0;
 400
 401         clear_nlink(inode);
 402         make_bad_inode(inode);
 403         unlock_new_inode(inode);
 404
 405         i_size_write(inode, 0);
 406         if (F2FS_HAS_BLOCKS(inode))
 407                 err = f2fs_truncate(inode, false);
 408
 409         if (!err)
 410                 err = remove_inode_page(inode);
 411
 412         /*
 413          * if we skip truncate_node in remove_inode_page bacause we failed
 414          * before, it's better to find another way to release resource of
 415          * this inode (e.g. valid block count, node block or nid). Here we
 416          * choose to add this inode to orphan list, so that we can call iput
 417          * for releasing in orphan recovery flow.
 418          *
 419          * Note: we should add inode to orphan list before f2fs_unlock_op()
 420          * so we can prevent losing this orphan when encoutering checkpoint
 421          * and following suddenly power-off.
 422          */
 423         if (err && err != -ENOENT) {
 424                 err = acquire_orphan_inode(sbi);
 425                 if (!err)
 426                         add_orphan_inode(sbi, inode->i_ino);
 427         }
 428
 429         set_inode_flag(F2FS_I(inode), FI_FREE_NID);
 430         f2fs_unlock_op(sbi);
 431
 432         /* iput will drop the inode object */
 433         iput(inode);
 434 }