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 #include <linux/bitops.h>
  16
  17 #include "f2fs.h"
  18 #include "node.h"
  19
  20 #include <trace/events/f2fs.h>
  21
  22 void f2fs_set_inode_flags(struct inode *inode)
  23 {
  24         unsigned int flags = F2FS_I(inode)->i_flags;
  25         unsigned int new_fl = 0;
  26
  27         if (flags & FS_SYNC_FL)
  28                 new_fl |= S_SYNC;
  29         if (flags & FS_APPEND_FL)
  30                 new_fl |= S_APPEND;
  31         if (flags & FS_IMMUTABLE_FL)
  32                 new_fl |= S_IMMUTABLE;
  33         if (flags & FS_NOATIME_FL)
  34                 new_fl |= S_NOATIME;
  35         if (flags & FS_DIRSYNC_FL)
  36                 new_fl |= S_DIRSYNC;
  37         set_mask_bits(&inode->i_flags,
  38                         S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC, new_fl);
  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 void __set_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
  55 {
  56         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
  57                 if (old_valid_dev(inode->i_rdev)) {
  58                         ri->i_addr[0] =
  59                                 cpu_to_le32(old_encode_dev(inode->i_rdev));
  60                         ri->i_addr[1] = 0;
  61                 } else {
  62                         ri->i_addr[0] = 0;
  63                         ri->i_addr[1] =
  64                                 cpu_to_le32(new_encode_dev(inode->i_rdev));
  65                         ri->i_addr[2] = 0;
  66                 }
  67         }
  68 }
  69
  70 static int __recover_inline_status(struct inode *inode, struct page *ipage)
  71 {
  72         void *inline_data = inline_data_addr(ipage);
  73         struct f2fs_inode *ri;
  74         void *zbuf;
  75
  76         zbuf = kzalloc(MAX_INLINE_DATA, GFP_NOFS);
  77         if (!zbuf)
  78                 return -ENOMEM;
  79
  80         if (!memcmp(zbuf, inline_data, MAX_INLINE_DATA)) {
  81                 kfree(zbuf);
  82                 return 0;
  83         }
  84         kfree(zbuf);
  85
  86         f2fs_wait_on_page_writeback(ipage, NODE);
  87         set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
  88
  89         ri = F2FS_INODE(ipage);
  90         set_raw_inline(F2FS_I(inode), ri);
  91         set_page_dirty(ipage);
  92         return 0;
  93 }
  94
  95 static int do_read_inode(struct inode *inode)
  96 {
  97         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  98         struct f2fs_inode_info *fi = F2FS_I(inode);
  99         struct page *node_page;
 100         struct f2fs_inode *ri;
 101         int err = 0;
 102
 103         /* Check if ino is within scope */
 104         if (check_nid_range(sbi, inode->i_ino)) {
 105                 f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
 106                          (unsigned long) inode->i_ino);
 107                 WARN_ON(1);
 108                 return -EINVAL;
 109         }
 110
 111         node_page = get_node_page(sbi, inode->i_ino);
 112         if (IS_ERR(node_page))
 113                 return PTR_ERR(node_page);
 114
 115         ri = F2FS_INODE(node_page);
 116
 117         inode->i_mode = le16_to_cpu(ri->i_mode);
 118         i_uid_write(inode, le32_to_cpu(ri->i_uid));
 119         i_gid_write(inode, le32_to_cpu(ri->i_gid));
 120         set_nlink(inode, le32_to_cpu(ri->i_links));
 121         inode->i_size = le64_to_cpu(ri->i_size);
 122         inode->i_blocks = le64_to_cpu(ri->i_blocks);
 123
 124         inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
 125         inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
 126         inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
 127         inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
 128         inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
 129         inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
 130         inode->i_generation = le32_to_cpu(ri->i_generation);
 131
 132         fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
 133         fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
 134         fi->i_flags = le32_to_cpu(ri->i_flags);
 135         fi->flags = 0;
 136         fi->i_advise = ri->i_advise;
 137         fi->i_pino = le32_to_cpu(ri->i_pino);
 138         fi->i_dir_level = ri->i_dir_level;
 139
 140         get_extent_info(&fi->ext, ri->i_ext);
 141         get_inline_info(fi, ri);
 142
 143         /* check data exist */
 144         if (f2fs_has_inline_data(inode) && !f2fs_exist_data(inode))
 145                 err = __recover_inline_status(inode, node_page);
 146
 147         /* get rdev by using inline_info */
 148         __get_inode_rdev(inode, ri);
 149
 150         f2fs_put_page(node_page, 1);
 151
 152         stat_inc_inline_inode(inode);
 153         stat_inc_inline_dir(inode);
 154
 155         return err;
 156 }
 157
 158 struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
 159 {
 160         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 161         struct inode *inode;
 162         int ret = 0;
 163
 164         inode = iget_locked(sb, ino);
 165         if (!inode)
 166                 return ERR_PTR(-ENOMEM);
 167
 168         if (!(inode->i_state & I_NEW)) {
 169                 trace_f2fs_iget(inode);
 170                 return inode;
 171         }
 172         if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
 173                 goto make_now;
 174
 175         ret = do_read_inode(inode);
 176         if (ret)
 177                 goto bad_inode;
 178 make_now:
 179         if (ino == F2FS_NODE_INO(sbi)) {
 180                 inode->i_mapping->a_ops = &f2fs_node_aops;
 181                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 182         } else if (ino == F2FS_META_INO(sbi)) {
 183                 inode->i_mapping->a_ops = &f2fs_meta_aops;
 184                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 185         } else if (S_ISREG(inode->i_mode)) {
 186                 inode->i_op = &f2fs_file_inode_operations;
 187                 inode->i_fop = &f2fs_file_operations;
 188                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 189         } else if (S_ISDIR(inode->i_mode)) {
 190                 inode->i_op = &f2fs_dir_inode_operations;
 191                 inode->i_fop = &f2fs_dir_operations;
 192                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 193                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 194         } else if (S_ISLNK(inode->i_mode)) {
 195                 inode->i_op = &f2fs_symlink_inode_operations;
 196                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 197         } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 198                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 199                 inode->i_op = &f2fs_special_inode_operations;
 200                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 201         } else {
 202                 ret = -EIO;
 203                 goto bad_inode;
 204         }
 205         unlock_new_inode(inode);
 206         trace_f2fs_iget(inode);
 207         return inode;
 208
 209 bad_inode:
 210         iget_failed(inode);
 211         trace_f2fs_iget_exit(inode, ret);
 212         return ERR_PTR(ret);
 213 }
 214
 215 void update_inode(struct inode *inode, struct page *node_page)
 216 {
 217         struct f2fs_inode *ri;
 218
 219         f2fs_wait_on_page_writeback(node_page, NODE);
 220
 221         ri = F2FS_INODE(node_page);
 222
 223         ri->i_mode = cpu_to_le16(inode->i_mode);
 224         ri->i_advise = F2FS_I(inode)->i_advise;
 225         ri->i_uid = cpu_to_le32(i_uid_read(inode));
 226         ri->i_gid = cpu_to_le32(i_gid_read(inode));
 227         ri->i_links = cpu_to_le32(inode->i_nlink);
 228         ri->i_size = cpu_to_le64(i_size_read(inode));
 229         ri->i_blocks = cpu_to_le64(inode->i_blocks);
 230         set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);
 231         set_raw_inline(F2FS_I(inode), ri);
 232
 233         ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 234         ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 235         ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 236         ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 237         ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 238         ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 239         ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
 240         ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
 241         ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
 242         ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
 243         ri->i_generation = cpu_to_le32(inode->i_generation);
 244         ri->i_dir_level = F2FS_I(inode)->i_dir_level;
 245
 246         __set_inode_rdev(inode, ri);
 247         set_cold_node(inode, node_page);
 248         set_page_dirty(node_page);
 249
 250         clear_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 251 }
 252
 253 void update_inode_page(struct inode *inode)
 254 {
 255         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 256         struct page *node_page;
 257 retry:
 258         node_page = get_node_page(sbi, inode->i_ino);
 259         if (IS_ERR(node_page)) {
 260                 int err = PTR_ERR(node_page);
 261                 if (err == -ENOMEM) {
 262                         cond_resched();
 263                         goto retry;
 264                 } else if (err != -ENOENT) {
 265                         f2fs_stop_checkpoint(sbi);
 266                 }
 267                 return;
 268         }
 269         update_inode(inode, node_page);
 270         f2fs_put_page(node_page, 1);
 271 }
 272
 273 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 274 {
 275         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 276
 277         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 278                         inode->i_ino == F2FS_META_INO(sbi))
 279                 return 0;
 280
 281         if (!is_inode_flag_set(F2FS_I(inode), FI_DIRTY_INODE))
 282                 return 0;
 283
 284         /*
 285          * We need to lock here to prevent from producing dirty node pages
 286          * during the urgent cleaning time when runing out of free sections.
 287          */
 288         f2fs_lock_op(sbi);
 289         update_inode_page(inode);
 290         f2fs_unlock_op(sbi);
 291
 292         if (wbc)
 293                 f2fs_balance_fs(sbi);
 294
 295         return 0;
 296 }
 297
 298 /*
 299  * Called at the last iput() if i_nlink is zero
 300  */
 301 void f2fs_evict_inode(struct inode *inode)
 302 {
 303         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 304         nid_t xnid = F2FS_I(inode)->i_xattr_nid;
 305
 306         /* some remained atomic pages should discarded */
 307         if (f2fs_is_atomic_file(inode) || f2fs_is_volatile_file(inode))
 308                 commit_inmem_pages(inode, true);
 309
 310         trace_f2fs_evict_inode(inode);
 311         truncate_inode_pages_final(&inode->i_data);
 312
 313         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 314                         inode->i_ino == F2FS_META_INO(sbi))
 315                 goto out_clear;
 316
 317         f2fs_bug_on(sbi, get_dirty_pages(inode));
 318         remove_dirty_dir_inode(inode);
 319
 320         if (inode->i_nlink || is_bad_inode(inode))
 321                 goto no_delete;
 322
 323         sb_start_intwrite(inode->i_sb);
 324         set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
 325         i_size_write(inode, 0);
 326
 327         if (F2FS_HAS_BLOCKS(inode))
 328                 f2fs_truncate(inode);
 329
 330         f2fs_lock_op(sbi);
 331         remove_inode_page(inode);
 332         f2fs_unlock_op(sbi);
 333
 334         sb_end_intwrite(inode->i_sb);
 335 no_delete:
 336         stat_dec_inline_dir(inode);
 337         stat_dec_inline_inode(inode);
 338         invalidate_mapping_pages(NODE_MAPPING(sbi), inode->i_ino, inode->i_ino);
 339         if (xnid)
 340                 invalidate_mapping_pages(NODE_MAPPING(sbi), xnid, xnid);
 341         if (is_inode_flag_set(F2FS_I(inode), FI_APPEND_WRITE))
 342                 add_dirty_inode(sbi, inode->i_ino, APPEND_INO);
 343         if (is_inode_flag_set(F2FS_I(inode), FI_UPDATE_WRITE))
 344                 add_dirty_inode(sbi, inode->i_ino, UPDATE_INO);
 345 out_clear:
 346         clear_inode(inode);
 347 }
 348
 349 /* caller should call f2fs_lock_op() */
 350 void handle_failed_inode(struct inode *inode)
 351 {
 352         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 353
 354         clear_nlink(inode);
 355         make_bad_inode(inode);
 356         unlock_new_inode(inode);
 357
 358         i_size_write(inode, 0);
 359         if (F2FS_HAS_BLOCKS(inode))
 360                 f2fs_truncate(inode);
 361
 362         remove_inode_page(inode);
 363
 364         clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 365         clear_inode_flag(F2FS_I(inode), FI_INLINE_DENTRY);
 366         alloc_nid_failed(sbi, inode->i_ino);
 367         f2fs_unlock_op(sbi);
 368
 369         /* iput will drop the inode object */
 370         iput(inode);
 371 }