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 void __recover_inline_status(struct inode *inode, struct page *ipage)
  71 {
  72         void *inline_data = inline_data_addr(ipage);
  73         __le32 *start = inline_data;
  74         __le32 *end = start + MAX_INLINE_DATA / sizeof(__le32);
  75
  76         while (start < end) {
  77                 if (*start++) {
  78                         f2fs_wait_on_page_writeback(ipage, NODE);
  79
  80                         set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
  81                         set_raw_inline(F2FS_I(inode), F2FS_INODE(ipage));
  82                         set_page_dirty(ipage);
  83                         return;
  84                 }
  85         }
  86         return;
  87 }
  88
  89 static int do_read_inode(struct inode *inode)
  90 {
  91         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  92         struct f2fs_inode_info *fi = F2FS_I(inode);
  93         struct page *node_page;
  94         struct f2fs_inode *ri;
  95
  96         /* Check if ino is within scope */
  97         if (check_nid_range(sbi, inode->i_ino)) {
  98                 f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
  99                          (unsigned long) inode->i_ino);
 100                 WARN_ON(1);
 101                 return -EINVAL;
 102         }
 103
 104         node_page = get_node_page(sbi, inode->i_ino);
 105         if (IS_ERR(node_page))
 106                 return PTR_ERR(node_page);
 107
 108         ri = F2FS_INODE(node_page);
 109
 110         inode->i_mode = le16_to_cpu(ri->i_mode);
 111         i_uid_write(inode, le32_to_cpu(ri->i_uid));
 112         i_gid_write(inode, le32_to_cpu(ri->i_gid));
 113         set_nlink(inode, le32_to_cpu(ri->i_links));
 114         inode->i_size = le64_to_cpu(ri->i_size);
 115         inode->i_blocks = le64_to_cpu(ri->i_blocks);
 116
 117         inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
 118         inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
 119         inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
 120         inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
 121         inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
 122         inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
 123         inode->i_generation = le32_to_cpu(ri->i_generation);
 124
 125         fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
 126         fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
 127         fi->i_flags = le32_to_cpu(ri->i_flags);
 128         fi->flags = 0;
 129         fi->i_advise = ri->i_advise;
 130         fi->i_pino = le32_to_cpu(ri->i_pino);
 131         fi->i_dir_level = ri->i_dir_level;
 132
 133         get_extent_info(&fi->ext, ri->i_ext);
 134         get_inline_info(fi, ri);
 135
 136         /* check data exist */
 137         if (f2fs_has_inline_data(inode) && !f2fs_exist_data(inode))
 138                 __recover_inline_status(inode, node_page);
 139
 140         /* get rdev by using inline_info */
 141         __get_inode_rdev(inode, ri);
 142
 143         f2fs_put_page(node_page, 1);
 144
 145         stat_inc_inline_inode(inode);
 146         stat_inc_inline_dir(inode);
 147
 148         return 0;
 149 }
 150
 151 struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
 152 {
 153         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 154         struct inode *inode;
 155         int ret = 0;
 156
 157         inode = iget_locked(sb, ino);
 158         if (!inode)
 159                 return ERR_PTR(-ENOMEM);
 160
 161         if (!(inode->i_state & I_NEW)) {
 162                 trace_f2fs_iget(inode);
 163                 return inode;
 164         }
 165         if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
 166                 goto make_now;
 167
 168         ret = do_read_inode(inode);
 169         if (ret)
 170                 goto bad_inode;
 171 make_now:
 172         if (ino == F2FS_NODE_INO(sbi)) {
 173                 inode->i_mapping->a_ops = &f2fs_node_aops;
 174                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 175         } else if (ino == F2FS_META_INO(sbi)) {
 176                 inode->i_mapping->a_ops = &f2fs_meta_aops;
 177                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 178         } else if (S_ISREG(inode->i_mode)) {
 179                 inode->i_op = &f2fs_file_inode_operations;
 180                 inode->i_fop = &f2fs_file_operations;
 181                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 182         } else if (S_ISDIR(inode->i_mode)) {
 183                 inode->i_op = &f2fs_dir_inode_operations;
 184                 inode->i_fop = &f2fs_dir_operations;
 185                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 186                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 187         } else if (S_ISLNK(inode->i_mode)) {
 188                 inode->i_op = &f2fs_symlink_inode_operations;
 189                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 190         } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 191                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 192                 inode->i_op = &f2fs_special_inode_operations;
 193                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 194         } else {
 195                 ret = -EIO;
 196                 goto bad_inode;
 197         }
 198         unlock_new_inode(inode);
 199         trace_f2fs_iget(inode);
 200         return inode;
 201
 202 bad_inode:
 203         iget_failed(inode);
 204         trace_f2fs_iget_exit(inode, ret);
 205         return ERR_PTR(ret);
 206 }
 207
 208 void update_inode(struct inode *inode, struct page *node_page)
 209 {
 210         struct f2fs_inode *ri;
 211
 212         f2fs_wait_on_page_writeback(node_page, NODE);
 213
 214         ri = F2FS_INODE(node_page);
 215
 216         ri->i_mode = cpu_to_le16(inode->i_mode);
 217         ri->i_advise = F2FS_I(inode)->i_advise;
 218         ri->i_uid = cpu_to_le32(i_uid_read(inode));
 219         ri->i_gid = cpu_to_le32(i_gid_read(inode));
 220         ri->i_links = cpu_to_le32(inode->i_nlink);
 221         ri->i_size = cpu_to_le64(i_size_read(inode));
 222         ri->i_blocks = cpu_to_le64(inode->i_blocks);
 223         set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);
 224         set_raw_inline(F2FS_I(inode), ri);
 225
 226         ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 227         ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 228         ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 229         ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 230         ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 231         ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 232         ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
 233         ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
 234         ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
 235         ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
 236         ri->i_generation = cpu_to_le32(inode->i_generation);
 237         ri->i_dir_level = F2FS_I(inode)->i_dir_level;
 238
 239         __set_inode_rdev(inode, ri);
 240         set_cold_node(inode, node_page);
 241         set_page_dirty(node_page);
 242
 243         clear_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 244 }
 245
 246 void update_inode_page(struct inode *inode)
 247 {
 248         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 249         struct page *node_page;
 250 retry:
 251         node_page = get_node_page(sbi, inode->i_ino);
 252         if (IS_ERR(node_page)) {
 253                 int err = PTR_ERR(node_page);
 254                 if (err == -ENOMEM) {
 255                         cond_resched();
 256                         goto retry;
 257                 } else if (err != -ENOENT) {
 258                         f2fs_stop_checkpoint(sbi);
 259                 }
 260                 return;
 261         }
 262         update_inode(inode, node_page);
 263         f2fs_put_page(node_page, 1);
 264 }
 265
 266 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 267 {
 268         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 269
 270         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 271                         inode->i_ino == F2FS_META_INO(sbi))
 272                 return 0;
 273
 274         if (!is_inode_flag_set(F2FS_I(inode), FI_DIRTY_INODE))
 275                 return 0;
 276
 277         /*
 278          * We need to lock here to prevent from producing dirty node pages
 279          * during the urgent cleaning time when runing out of free sections.
 280          */
 281         f2fs_lock_op(sbi);
 282         update_inode_page(inode);
 283         f2fs_unlock_op(sbi);
 284
 285         if (wbc)
 286                 f2fs_balance_fs(sbi);
 287
 288         return 0;
 289 }
 290
 291 /*
 292  * Called at the last iput() if i_nlink is zero
 293  */
 294 void f2fs_evict_inode(struct inode *inode)
 295 {
 296         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 297         nid_t xnid = F2FS_I(inode)->i_xattr_nid;
 298
 299         /* some remained atomic pages should discarded */
 300         if (f2fs_is_atomic_file(inode))
 301                 commit_inmem_pages(inode, true);
 302
 303         trace_f2fs_evict_inode(inode);
 304         truncate_inode_pages_final(&inode->i_data);
 305
 306         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 307                         inode->i_ino == F2FS_META_INO(sbi))
 308                 goto out_clear;
 309
 310         f2fs_bug_on(sbi, get_dirty_pages(inode));
 311         remove_dirty_dir_inode(inode);
 312
 313         if (inode->i_nlink || is_bad_inode(inode))
 314                 goto no_delete;
 315
 316         sb_start_intwrite(inode->i_sb);
 317         set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
 318         i_size_write(inode, 0);
 319
 320         if (F2FS_HAS_BLOCKS(inode))
 321                 f2fs_truncate(inode);
 322
 323         f2fs_lock_op(sbi);
 324         remove_inode_page(inode);
 325         f2fs_unlock_op(sbi);
 326
 327         sb_end_intwrite(inode->i_sb);
 328 no_delete:
 329         stat_dec_inline_dir(inode);
 330         stat_dec_inline_inode(inode);
 331         invalidate_mapping_pages(NODE_MAPPING(sbi), inode->i_ino, inode->i_ino);
 332         if (xnid)
 333                 invalidate_mapping_pages(NODE_MAPPING(sbi), xnid, xnid);
 334         if (is_inode_flag_set(F2FS_I(inode), FI_APPEND_WRITE))
 335                 add_dirty_inode(sbi, inode->i_ino, APPEND_INO);
 336         if (is_inode_flag_set(F2FS_I(inode), FI_UPDATE_WRITE))
 337                 add_dirty_inode(sbi, inode->i_ino, UPDATE_INO);
 338 out_clear:
 339         clear_inode(inode);
 340 }
 341
 342 /* caller should call f2fs_lock_op() */
 343 void handle_failed_inode(struct inode *inode)
 344 {
 345         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 346
 347         clear_nlink(inode);
 348         make_bad_inode(inode);
 349         unlock_new_inode(inode);
 350
 351         i_size_write(inode, 0);
 352         if (F2FS_HAS_BLOCKS(inode))
 353                 f2fs_truncate(inode);
 354
 355         remove_inode_page(inode);
 356
 357         clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 358         clear_inode_flag(F2FS_I(inode), FI_INLINE_DENTRY);
 359         alloc_nid_failed(sbi, inode->i_ino);
 360         f2fs_unlock_op(sbi);
 361
 362         /* iput will drop the inode object */
 363         iput(inode);
 364 }