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
  25         inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE |
  26                         S_NOATIME | S_DIRSYNC);
  27
  28         if (flags & FS_SYNC_FL)
  29                 inode->i_flags |= S_SYNC;
  30         if (flags & FS_APPEND_FL)
  31                 inode->i_flags |= S_APPEND;
  32         if (flags & FS_IMMUTABLE_FL)
  33                 inode->i_flags |= S_IMMUTABLE;
  34         if (flags & FS_NOATIME_FL)
  35                 inode->i_flags |= S_NOATIME;
  36         if (flags & FS_DIRSYNC_FL)
  37                 inode->i_flags |= 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 void __set_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
  54 {
  55         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
  56                 if (old_valid_dev(inode->i_rdev)) {
  57                         ri->i_addr[0] =
  58                                 cpu_to_le32(old_encode_dev(inode->i_rdev));
  59                         ri->i_addr[1] = 0;
  60                 } else {
  61                         ri->i_addr[0] = 0;
  62                         ri->i_addr[1] =
  63                                 cpu_to_le32(new_encode_dev(inode->i_rdev));
  64                         ri->i_addr[2] = 0;
  65                 }
  66         }
  67 }
  68
  69 static int do_read_inode(struct inode *inode)
  70 {
  71         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  72         struct f2fs_inode_info *fi = F2FS_I(inode);
  73         struct page *node_page;
  74         struct f2fs_inode *ri;
  75
  76         /* Check if ino is within scope */
  77         if (check_nid_range(sbi, inode->i_ino)) {
  78                 f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
  79                          (unsigned long) inode->i_ino);
  80                 return -EINVAL;
  81         }
  82
  83         node_page = get_node_page(sbi, inode->i_ino);
  84         if (IS_ERR(node_page))
  85                 return PTR_ERR(node_page);
  86
  87         ri = F2FS_INODE(node_page);
  88
  89         inode->i_mode = le16_to_cpu(ri->i_mode);
  90         i_uid_write(inode, le32_to_cpu(ri->i_uid));
  91         i_gid_write(inode, le32_to_cpu(ri->i_gid));
  92         set_nlink(inode, le32_to_cpu(ri->i_links));
  93         inode->i_size = le64_to_cpu(ri->i_size);
  94         inode->i_blocks = le64_to_cpu(ri->i_blocks);
  95
  96         inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
  97         inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
  98         inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
  99         inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
 100         inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
 101         inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
 102         inode->i_generation = le32_to_cpu(ri->i_generation);
 103
 104         fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
 105         fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
 106         fi->i_flags = le32_to_cpu(ri->i_flags);
 107         fi->flags = 0;
 108         fi->i_advise = ri->i_advise;
 109         fi->i_pino = le32_to_cpu(ri->i_pino);
 110
 111         get_extent_info(&fi->ext, ri->i_ext);
 112         get_inline_info(fi, ri);
 113
 114         /* get rdev by using inline_info */
 115         __get_inode_rdev(inode, ri);
 116
 117         f2fs_put_page(node_page, 1);
 118         return 0;
 119 }
 120
 121 struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
 122 {
 123         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 124         struct inode *inode;
 125         int ret = 0;
 126
 127         inode = iget_locked(sb, ino);
 128         if (!inode)
 129                 return ERR_PTR(-ENOMEM);
 130
 131         if (!(inode->i_state & I_NEW)) {
 132                 trace_f2fs_iget(inode);
 133                 return inode;
 134         }
 135         if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
 136                 goto make_now;
 137
 138         ret = do_read_inode(inode);
 139         if (ret)
 140                 goto bad_inode;
 141 make_now:
 142         if (ino == F2FS_NODE_INO(sbi)) {
 143                 inode->i_mapping->a_ops = &f2fs_node_aops;
 144                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 145         } else if (ino == F2FS_META_INO(sbi)) {
 146                 inode->i_mapping->a_ops = &f2fs_meta_aops;
 147                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 148         } else if (S_ISREG(inode->i_mode)) {
 149                 inode->i_op = &f2fs_file_inode_operations;
 150                 inode->i_fop = &f2fs_file_operations;
 151                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 152         } else if (S_ISDIR(inode->i_mode)) {
 153                 inode->i_op = &f2fs_dir_inode_operations;
 154                 inode->i_fop = &f2fs_dir_operations;
 155                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 156                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 157         } else if (S_ISLNK(inode->i_mode)) {
 158                 inode->i_op = &f2fs_symlink_inode_operations;
 159                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 160         } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 161                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 162                 inode->i_op = &f2fs_special_inode_operations;
 163                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 164         } else {
 165                 ret = -EIO;
 166                 goto bad_inode;
 167         }
 168         unlock_new_inode(inode);
 169         trace_f2fs_iget(inode);
 170         return inode;
 171
 172 bad_inode:
 173         iget_failed(inode);
 174         trace_f2fs_iget_exit(inode, ret);
 175         return ERR_PTR(ret);
 176 }
 177
 178 void update_inode(struct inode *inode, struct page *node_page)
 179 {
 180         struct f2fs_inode *ri;
 181
 182         f2fs_wait_on_page_writeback(node_page, NODE);
 183
 184         ri = F2FS_INODE(node_page);
 185
 186         ri->i_mode = cpu_to_le16(inode->i_mode);
 187         ri->i_advise = F2FS_I(inode)->i_advise;
 188         ri->i_uid = cpu_to_le32(i_uid_read(inode));
 189         ri->i_gid = cpu_to_le32(i_gid_read(inode));
 190         ri->i_links = cpu_to_le32(inode->i_nlink);
 191         ri->i_size = cpu_to_le64(i_size_read(inode));
 192         ri->i_blocks = cpu_to_le64(inode->i_blocks);
 193         set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);
 194         set_raw_inline(F2FS_I(inode), ri);
 195
 196         ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 197         ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 198         ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 199         ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 200         ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 201         ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 202         ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
 203         ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
 204         ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
 205         ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
 206         ri->i_generation = cpu_to_le32(inode->i_generation);
 207
 208         __set_inode_rdev(inode, ri);
 209         set_cold_node(inode, node_page);
 210         set_page_dirty(node_page);
 211
 212         clear_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 213 }
 214
 215 int update_inode_page(struct inode *inode)
 216 {
 217         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 218         struct page *node_page;
 219
 220         node_page = get_node_page(sbi, inode->i_ino);
 221         if (IS_ERR(node_page))
 222                 return PTR_ERR(node_page);
 223
 224         update_inode(inode, node_page);
 225         f2fs_put_page(node_page, 1);
 226         return 0;
 227 }
 228
 229 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 230 {
 231         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 232         int ret;
 233
 234         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 235                         inode->i_ino == F2FS_META_INO(sbi))
 236                 return 0;
 237
 238         if (!is_inode_flag_set(F2FS_I(inode), FI_DIRTY_INODE))
 239                 return 0;
 240
 241         /*
 242          * We need to lock here to prevent from producing dirty node pages
 243          * during the urgent cleaning time when runing out of free sections.
 244          */
 245         f2fs_lock_op(sbi);
 246         ret = update_inode_page(inode);
 247         f2fs_unlock_op(sbi);
 248
 249         if (wbc)
 250                 f2fs_balance_fs(sbi);
 251
 252         return ret;
 253 }
 254
 255 /*
 256  * Called at the last iput() if i_nlink is zero
 257  */
 258 void f2fs_evict_inode(struct inode *inode)
 259 {
 260         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 261
 262         trace_f2fs_evict_inode(inode);
 263         truncate_inode_pages_final(&inode->i_data);
 264
 265         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 266                         inode->i_ino == F2FS_META_INO(sbi))
 267                 goto no_delete;
 268
 269         f2fs_bug_on(atomic_read(&F2FS_I(inode)->dirty_dents));
 270         remove_dirty_dir_inode(inode);
 271
 272         if (inode->i_nlink || is_bad_inode(inode))
 273                 goto no_delete;
 274
 275         sb_start_intwrite(inode->i_sb);
 276         set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
 277         i_size_write(inode, 0);
 278
 279         if (F2FS_HAS_BLOCKS(inode))
 280                 f2fs_truncate(inode);
 281
 282         f2fs_lock_op(sbi);
 283         remove_inode_page(inode);
 284         stat_dec_inline_inode(inode);
 285         f2fs_unlock_op(sbi);
 286
 287         sb_end_intwrite(inode->i_sb);
 288 no_delete:
 289         clear_inode(inode);
 290 }