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 do_read_inode(struct inode *inode)
  71 {
  72         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  73         struct f2fs_inode_info *fi = F2FS_I(inode);
  74         struct page *node_page;
  75         struct f2fs_inode *ri;
  76
  77         /* Check if ino is within scope */
  78         if (check_nid_range(sbi, inode->i_ino)) {
  79                 f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
  80                          (unsigned long) inode->i_ino);
  81                 return -EINVAL;
  82         }
  83
  84         node_page = get_node_page(sbi, inode->i_ino);
  85         if (IS_ERR(node_page))
  86                 return PTR_ERR(node_page);
  87
  88         ri = F2FS_INODE(node_page);
  89
  90         inode->i_mode = le16_to_cpu(ri->i_mode);
  91         i_uid_write(inode, le32_to_cpu(ri->i_uid));
  92         i_gid_write(inode, le32_to_cpu(ri->i_gid));
  93         set_nlink(inode, le32_to_cpu(ri->i_links));
  94         inode->i_size = le64_to_cpu(ri->i_size);
  95         inode->i_blocks = le64_to_cpu(ri->i_blocks);
  96
  97         inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
  98         inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
  99         inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
 100         inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
 101         inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
 102         inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
 103         inode->i_generation = le32_to_cpu(ri->i_generation);
 104
 105         fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
 106         fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
 107         fi->i_flags = le32_to_cpu(ri->i_flags);
 108         fi->flags = 0;
 109         fi->i_advise = ri->i_advise;
 110         fi->i_pino = le32_to_cpu(ri->i_pino);
 111         fi->i_dir_level = ri->i_dir_level;
 112
 113         get_extent_info(&fi->ext, ri->i_ext);
 114         get_inline_info(fi, ri);
 115
 116         /* get rdev by using inline_info */
 117         __get_inode_rdev(inode, ri);
 118
 119         f2fs_put_page(node_page, 1);
 120         return 0;
 121 }
 122
 123 struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
 124 {
 125         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 126         struct inode *inode;
 127         int ret = 0;
 128
 129         inode = iget_locked(sb, ino);
 130         if (!inode)
 131                 return ERR_PTR(-ENOMEM);
 132
 133         if (!(inode->i_state & I_NEW)) {
 134                 trace_f2fs_iget(inode);
 135                 return inode;
 136         }
 137         if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
 138                 goto make_now;
 139
 140         ret = do_read_inode(inode);
 141         if (ret)
 142                 goto bad_inode;
 143 make_now:
 144         if (ino == F2FS_NODE_INO(sbi)) {
 145                 inode->i_mapping->a_ops = &f2fs_node_aops;
 146                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 147         } else if (ino == F2FS_META_INO(sbi)) {
 148                 inode->i_mapping->a_ops = &f2fs_meta_aops;
 149                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 150         } else if (S_ISREG(inode->i_mode)) {
 151                 inode->i_op = &f2fs_file_inode_operations;
 152                 inode->i_fop = &f2fs_file_operations;
 153                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 154         } else if (S_ISDIR(inode->i_mode)) {
 155                 inode->i_op = &f2fs_dir_inode_operations;
 156                 inode->i_fop = &f2fs_dir_operations;
 157                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 158                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 159         } else if (S_ISLNK(inode->i_mode)) {
 160                 inode->i_op = &f2fs_symlink_inode_operations;
 161                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 162         } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 163                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 164                 inode->i_op = &f2fs_special_inode_operations;
 165                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 166         } else {
 167                 ret = -EIO;
 168                 goto bad_inode;
 169         }
 170         unlock_new_inode(inode);
 171         trace_f2fs_iget(inode);
 172         return inode;
 173
 174 bad_inode:
 175         iget_failed(inode);
 176         trace_f2fs_iget_exit(inode, ret);
 177         return ERR_PTR(ret);
 178 }
 179
 180 void update_inode(struct inode *inode, struct page *node_page)
 181 {
 182         struct f2fs_inode *ri;
 183
 184         f2fs_wait_on_page_writeback(node_page, NODE);
 185
 186         ri = F2FS_INODE(node_page);
 187
 188         ri->i_mode = cpu_to_le16(inode->i_mode);
 189         ri->i_advise = F2FS_I(inode)->i_advise;
 190         ri->i_uid = cpu_to_le32(i_uid_read(inode));
 191         ri->i_gid = cpu_to_le32(i_gid_read(inode));
 192         ri->i_links = cpu_to_le32(inode->i_nlink);
 193         ri->i_size = cpu_to_le64(i_size_read(inode));
 194         ri->i_blocks = cpu_to_le64(inode->i_blocks);
 195         set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);
 196         set_raw_inline(F2FS_I(inode), ri);
 197
 198         ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 199         ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 200         ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 201         ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 202         ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 203         ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 204         ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
 205         ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
 206         ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
 207         ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
 208         ri->i_generation = cpu_to_le32(inode->i_generation);
 209         ri->i_dir_level = F2FS_I(inode)->i_dir_level;
 210
 211         __set_inode_rdev(inode, ri);
 212         set_cold_node(inode, node_page);
 213         set_page_dirty(node_page);
 214
 215         clear_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 216 }
 217
 218 void update_inode_page(struct inode *inode)
 219 {
 220         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 221         struct page *node_page;
 222 retry:
 223         node_page = get_node_page(sbi, inode->i_ino);
 224         if (IS_ERR(node_page)) {
 225                 int err = PTR_ERR(node_page);
 226                 if (err == -ENOMEM) {
 227                         cond_resched();
 228                         goto retry;
 229                 } else if (err != -ENOENT) {
 230                         f2fs_stop_checkpoint(sbi);
 231                 }
 232                 return;
 233         }
 234         update_inode(inode, node_page);
 235         f2fs_put_page(node_page, 1);
 236 }
 237
 238 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 239 {
 240         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 241
 242         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 243                         inode->i_ino == F2FS_META_INO(sbi))
 244                 return 0;
 245
 246         if (!is_inode_flag_set(F2FS_I(inode), FI_DIRTY_INODE))
 247                 return 0;
 248
 249         /*
 250          * We need to lock here to prevent from producing dirty node pages
 251          * during the urgent cleaning time when runing out of free sections.
 252          */
 253         f2fs_lock_op(sbi);
 254         update_inode_page(inode);
 255         f2fs_unlock_op(sbi);
 256
 257         if (wbc)
 258                 f2fs_balance_fs(sbi);
 259
 260         return 0;
 261 }
 262
 263 /*
 264  * Called at the last iput() if i_nlink is zero
 265  */
 266 void f2fs_evict_inode(struct inode *inode)
 267 {
 268         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 269
 270         trace_f2fs_evict_inode(inode);
 271         truncate_inode_pages_final(&inode->i_data);
 272
 273         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 274                         inode->i_ino == F2FS_META_INO(sbi))
 275                 goto no_delete;
 276
 277         f2fs_bug_on(get_dirty_dents(inode));
 278         remove_dirty_dir_inode(inode);
 279
 280         if (inode->i_nlink || is_bad_inode(inode))
 281                 goto no_delete;
 282
 283         sb_start_intwrite(inode->i_sb);
 284         set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
 285         i_size_write(inode, 0);
 286
 287         if (F2FS_HAS_BLOCKS(inode))
 288                 f2fs_truncate(inode);
 289
 290         f2fs_lock_op(sbi);
 291         remove_inode_page(inode);
 292         stat_dec_inline_inode(inode);
 293         f2fs_unlock_op(sbi);
 294
 295         sb_end_intwrite(inode->i_sb);
 296 no_delete:
 297         clear_inode(inode);
 298         invalidate_mapping_pages(NODE_MAPPING(sbi), inode->i_ino, inode->i_ino);
 299 }