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 int do_read_inode(struct inode *inode)
  41 {
  42         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  43         struct f2fs_inode_info *fi = F2FS_I(inode);
  44         struct page *node_page;
  45         struct f2fs_node *rn;
  46         struct f2fs_inode *ri;
  47
  48         /* Check if ino is within scope */
  49         if (check_nid_range(sbi, inode->i_ino)) {
  50                 f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
  51                          (unsigned long) inode->i_ino);
  52                 return -EINVAL;
  53         }
  54
  55         node_page = get_node_page(sbi, inode->i_ino);
  56         if (IS_ERR(node_page))
  57                 return PTR_ERR(node_page);
  58
  59         rn = page_address(node_page);
  60         ri = &(rn->i);
  61
  62         inode->i_mode = le16_to_cpu(ri->i_mode);
  63         i_uid_write(inode, le32_to_cpu(ri->i_uid));
  64         i_gid_write(inode, le32_to_cpu(ri->i_gid));
  65         set_nlink(inode, le32_to_cpu(ri->i_links));
  66         inode->i_size = le64_to_cpu(ri->i_size);
  67         inode->i_blocks = le64_to_cpu(ri->i_blocks);
  68
  69         inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
  70         inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
  71         inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
  72         inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
  73         inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
  74         inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
  75         inode->i_generation = le32_to_cpu(ri->i_generation);
  76         if (ri->i_addr[0])
  77                 inode->i_rdev = old_decode_dev(le32_to_cpu(ri->i_addr[0]));
  78         else
  79                 inode->i_rdev = new_decode_dev(le32_to_cpu(ri->i_addr[1]));
  80
  81         fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
  82         fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
  83         fi->i_flags = le32_to_cpu(ri->i_flags);
  84         fi->flags = 0;
  85         fi->i_advise = ri->i_advise;
  86         fi->i_pino = le32_to_cpu(ri->i_pino);
  87         get_extent_info(&fi->ext, ri->i_ext);
  88         f2fs_put_page(node_page, 1);
  89         return 0;
  90 }
  91
  92 struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
  93 {
  94         struct f2fs_sb_info *sbi = F2FS_SB(sb);
  95         struct inode *inode;
  96         int ret = 0;
  97
  98         inode = iget_locked(sb, ino);
  99         if (!inode)
 100                 return ERR_PTR(-ENOMEM);
 101
 102         if (!(inode->i_state & I_NEW)) {
 103                 trace_f2fs_iget(inode);
 104                 return inode;
 105         }
 106         if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
 107                 goto make_now;
 108
 109         ret = do_read_inode(inode);
 110         if (ret)
 111                 goto bad_inode;
 112
 113         if (!sbi->por_doing && inode->i_nlink == 0) {
 114                 ret = -ENOENT;
 115                 goto bad_inode;
 116         }
 117
 118 make_now:
 119         if (ino == F2FS_NODE_INO(sbi)) {
 120                 inode->i_mapping->a_ops = &f2fs_node_aops;
 121                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 122         } else if (ino == F2FS_META_INO(sbi)) {
 123                 inode->i_mapping->a_ops = &f2fs_meta_aops;
 124                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 125         } else if (S_ISREG(inode->i_mode)) {
 126                 inode->i_op = &f2fs_file_inode_operations;
 127                 inode->i_fop = &f2fs_file_operations;
 128                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 129         } else if (S_ISDIR(inode->i_mode)) {
 130                 inode->i_op = &f2fs_dir_inode_operations;
 131                 inode->i_fop = &f2fs_dir_operations;
 132                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 133                 mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER_MOVABLE |
 134                                 __GFP_ZERO);
 135         } else if (S_ISLNK(inode->i_mode)) {
 136                 inode->i_op = &f2fs_symlink_inode_operations;
 137                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 138         } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 139                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 140                 inode->i_op = &f2fs_special_inode_operations;
 141                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 142         } else {
 143                 ret = -EIO;
 144                 goto bad_inode;
 145         }
 146         unlock_new_inode(inode);
 147         trace_f2fs_iget(inode);
 148         return inode;
 149
 150 bad_inode:
 151         iget_failed(inode);
 152         trace_f2fs_iget_exit(inode, ret);
 153         return ERR_PTR(ret);
 154 }
 155
 156 void update_inode(struct inode *inode, struct page *node_page)
 157 {
 158         struct f2fs_node *rn;
 159         struct f2fs_inode *ri;
 160
 161         wait_on_page_writeback(node_page);
 162
 163         rn = page_address(node_page);
 164         ri = &(rn->i);
 165
 166         ri->i_mode = cpu_to_le16(inode->i_mode);
 167         ri->i_advise = F2FS_I(inode)->i_advise;
 168         ri->i_uid = cpu_to_le32(i_uid_read(inode));
 169         ri->i_gid = cpu_to_le32(i_gid_read(inode));
 170         ri->i_links = cpu_to_le32(inode->i_nlink);
 171         ri->i_size = cpu_to_le64(i_size_read(inode));
 172         ri->i_blocks = cpu_to_le64(inode->i_blocks);
 173         set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);
 174
 175         ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 176         ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 177         ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 178         ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 179         ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 180         ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 181         ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
 182         ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
 183         ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
 184         ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
 185         ri->i_generation = cpu_to_le32(inode->i_generation);
 186
 187         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 188                 if (old_valid_dev(inode->i_rdev)) {
 189                         ri->i_addr[0] =
 190                                 cpu_to_le32(old_encode_dev(inode->i_rdev));
 191                         ri->i_addr[1] = 0;
 192                 } else {
 193                         ri->i_addr[0] = 0;
 194                         ri->i_addr[1] =
 195                                 cpu_to_le32(new_encode_dev(inode->i_rdev));
 196                         ri->i_addr[2] = 0;
 197                 }
 198         }
 199
 200         set_cold_node(inode, node_page);
 201         set_page_dirty(node_page);
 202 }
 203
 204 int update_inode_page(struct inode *inode)
 205 {
 206         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 207         struct page *node_page;
 208
 209         node_page = get_node_page(sbi, inode->i_ino);
 210         if (IS_ERR(node_page))
 211                 return PTR_ERR(node_page);
 212
 213         update_inode(inode, node_page);
 214         f2fs_put_page(node_page, 1);
 215         return 0;
 216 }
 217
 218 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 219 {
 220         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 221         int ret, ilock;
 222
 223         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 224                         inode->i_ino == F2FS_META_INO(sbi))
 225                 return 0;
 226
 227         if (wbc)
 228                 f2fs_balance_fs(sbi);
 229
 230         /*
 231          * We need to lock here to prevent from producing dirty node pages
 232          * during the urgent cleaning time when runing out of free sections.
 233          */
 234         ilock = mutex_lock_op(sbi);
 235         ret = update_inode_page(inode);
 236         mutex_unlock_op(sbi, ilock);
 237         return ret;
 238 }
 239
 240 /*
 241  * Called at the last iput() if i_nlink is zero
 242  */
 243 void f2fs_evict_inode(struct inode *inode)
 244 {
 245         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 246         int ilock;
 247
 248         trace_f2fs_evict_inode(inode);
 249         truncate_inode_pages(&inode->i_data, 0);
 250
 251         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 252                         inode->i_ino == F2FS_META_INO(sbi))
 253                 goto no_delete;
 254
 255         BUG_ON(atomic_read(&F2FS_I(inode)->dirty_dents));
 256         remove_dirty_dir_inode(inode);
 257
 258         if (inode->i_nlink || is_bad_inode(inode))
 259                 goto no_delete;
 260
 261         sb_start_intwrite(inode->i_sb);
 262         set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
 263         i_size_write(inode, 0);
 264
 265         if (F2FS_HAS_BLOCKS(inode))
 266                 f2fs_truncate(inode);
 267
 268         ilock = mutex_lock_op(sbi);
 269         remove_inode_page(inode);
 270         mutex_unlock_op(sbi, ilock);
 271
 272         sb_end_intwrite(inode->i_sb);
 273 no_delete:
 274         clear_inode(inode);
 275 }