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 void f2fs_set_inode_flags(struct inode *inode)
  20 {
  21         unsigned int flags = F2FS_I(inode)->i_flags;
  22
  23         inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE |
  24                         S_NOATIME | S_DIRSYNC);
  25
  26         if (flags & FS_SYNC_FL)
  27                 inode->i_flags |= S_SYNC;
  28         if (flags & FS_APPEND_FL)
  29                 inode->i_flags |= S_APPEND;
  30         if (flags & FS_IMMUTABLE_FL)
  31                 inode->i_flags |= S_IMMUTABLE;
  32         if (flags & FS_NOATIME_FL)
  33                 inode->i_flags |= S_NOATIME;
  34         if (flags & FS_DIRSYNC_FL)
  35                 inode->i_flags |= S_DIRSYNC;
  36 }
  37
  38 static int do_read_inode(struct inode *inode)
  39 {
  40         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  41         struct f2fs_inode_info *fi = F2FS_I(inode);
  42         struct page *node_page;
  43         struct f2fs_node *rn;
  44         struct f2fs_inode *ri;
  45
  46         /* Check if ino is within scope */
  47         check_nid_range(sbi, inode->i_ino);
  48
  49         node_page = get_node_page(sbi, inode->i_ino);
  50         if (IS_ERR(node_page))
  51                 return PTR_ERR(node_page);
  52
  53         rn = page_address(node_page);
  54         ri = &(rn->i);
  55
  56         inode->i_mode = le16_to_cpu(ri->i_mode);
  57         i_uid_write(inode, le32_to_cpu(ri->i_uid));
  58         i_gid_write(inode, le32_to_cpu(ri->i_gid));
  59         set_nlink(inode, le32_to_cpu(ri->i_links));
  60         inode->i_size = le64_to_cpu(ri->i_size);
  61         inode->i_blocks = le64_to_cpu(ri->i_blocks);
  62
  63         inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
  64         inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
  65         inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
  66         inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
  67         inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
  68         inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
  69         inode->i_generation = le32_to_cpu(ri->i_generation);
  70         if (ri->i_addr[0])
  71                 inode->i_rdev = old_decode_dev(le32_to_cpu(ri->i_addr[0]));
  72         else
  73                 inode->i_rdev = new_decode_dev(le32_to_cpu(ri->i_addr[1]));
  74
  75         fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
  76         fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
  77         fi->i_flags = le32_to_cpu(ri->i_flags);
  78         fi->flags = 0;
  79         fi->data_version = le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver) - 1;
  80         fi->i_advise = ri->i_advise;
  81         fi->i_pino = le32_to_cpu(ri->i_pino);
  82         get_extent_info(&fi->ext, ri->i_ext);
  83         f2fs_put_page(node_page, 1);
  84         return 0;
  85 }
  86
  87 struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
  88 {
  89         struct f2fs_sb_info *sbi = F2FS_SB(sb);
  90         struct inode *inode;
  91         int ret;
  92
  93         inode = iget_locked(sb, ino);
  94         if (!inode)
  95                 return ERR_PTR(-ENOMEM);
  96         if (!(inode->i_state & I_NEW))
  97                 return inode;
  98         if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
  99                 goto make_now;
 100
 101         ret = do_read_inode(inode);
 102         if (ret)
 103                 goto bad_inode;
 104
 105         if (!sbi->por_doing && inode->i_nlink == 0) {
 106                 ret = -ENOENT;
 107                 goto bad_inode;
 108         }
 109
 110 make_now:
 111         if (ino == F2FS_NODE_INO(sbi)) {
 112                 inode->i_mapping->a_ops = &f2fs_node_aops;
 113                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 114         } else if (ino == F2FS_META_INO(sbi)) {
 115                 inode->i_mapping->a_ops = &f2fs_meta_aops;
 116                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 117         } else if (S_ISREG(inode->i_mode)) {
 118                 inode->i_op = &f2fs_file_inode_operations;
 119                 inode->i_fop = &f2fs_file_operations;
 120                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 121         } else if (S_ISDIR(inode->i_mode)) {
 122                 inode->i_op = &f2fs_dir_inode_operations;
 123                 inode->i_fop = &f2fs_dir_operations;
 124                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 125                 mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER_MOVABLE |
 126                                 __GFP_ZERO);
 127         } else if (S_ISLNK(inode->i_mode)) {
 128                 inode->i_op = &f2fs_symlink_inode_operations;
 129                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 130         } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 131                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 132                 inode->i_op = &f2fs_special_inode_operations;
 133                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 134         } else {
 135                 ret = -EIO;
 136                 goto bad_inode;
 137         }
 138         unlock_new_inode(inode);
 139
 140         return inode;
 141
 142 bad_inode:
 143         iget_failed(inode);
 144         return ERR_PTR(ret);
 145 }
 146
 147 void update_inode(struct inode *inode, struct page *node_page)
 148 {
 149         struct f2fs_node *rn;
 150         struct f2fs_inode *ri;
 151
 152         wait_on_page_writeback(node_page);
 153
 154         rn = page_address(node_page);
 155         ri = &(rn->i);
 156
 157         ri->i_mode = cpu_to_le16(inode->i_mode);
 158         ri->i_advise = F2FS_I(inode)->i_advise;
 159         ri->i_uid = cpu_to_le32(i_uid_read(inode));
 160         ri->i_gid = cpu_to_le32(i_gid_read(inode));
 161         ri->i_links = cpu_to_le32(inode->i_nlink);
 162         ri->i_size = cpu_to_le64(i_size_read(inode));
 163         ri->i_blocks = cpu_to_le64(inode->i_blocks);
 164         set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);
 165
 166         ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 167         ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 168         ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 169         ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 170         ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 171         ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 172         ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
 173         ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
 174         ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
 175         ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
 176         ri->i_generation = cpu_to_le32(inode->i_generation);
 177
 178         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 179                 if (old_valid_dev(inode->i_rdev)) {
 180                         ri->i_addr[0] =
 181                                 cpu_to_le32(old_encode_dev(inode->i_rdev));
 182                         ri->i_addr[1] = 0;
 183                 } else {
 184                         ri->i_addr[0] = 0;
 185                         ri->i_addr[1] =
 186                                 cpu_to_le32(new_encode_dev(inode->i_rdev));
 187                         ri->i_addr[2] = 0;
 188                 }
 189         }
 190
 191         set_cold_node(inode, node_page);
 192         set_page_dirty(node_page);
 193 }
 194
 195 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 196 {
 197         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 198         struct page *node_page;
 199         bool need_lock = false;
 200
 201         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 202                         inode->i_ino == F2FS_META_INO(sbi))
 203                 return 0;
 204
 205         if (wbc)
 206                 f2fs_balance_fs(sbi);
 207
 208         node_page = get_node_page(sbi, inode->i_ino);
 209         if (IS_ERR(node_page))
 210                 return PTR_ERR(node_page);
 211
 212         if (!PageDirty(node_page)) {
 213                 need_lock = true;
 214                 f2fs_put_page(node_page, 1);
 215                 mutex_lock(&sbi->write_inode);
 216                 node_page = get_node_page(sbi, inode->i_ino);
 217                 if (IS_ERR(node_page)) {
 218                         mutex_unlock(&sbi->write_inode);
 219                         return PTR_ERR(node_page);
 220                 }
 221         }
 222         update_inode(inode, node_page);
 223         f2fs_put_page(node_page, 1);
 224         if (need_lock)
 225                 mutex_unlock(&sbi->write_inode);
 226         return 0;
 227 }
 228
 229 /*
 230  * Called at the last iput() if i_nlink is zero
 231  */
 232 void f2fs_evict_inode(struct inode *inode)
 233 {
 234         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 235
 236         truncate_inode_pages(&inode->i_data, 0);
 237
 238         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 239                         inode->i_ino == F2FS_META_INO(sbi))
 240                 goto no_delete;
 241
 242         BUG_ON(atomic_read(&F2FS_I(inode)->dirty_dents));
 243         remove_dirty_dir_inode(inode);
 244
 245         if (inode->i_nlink || is_bad_inode(inode))
 246                 goto no_delete;
 247
 248         sb_start_intwrite(inode->i_sb);
 249         set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
 250         i_size_write(inode, 0);
 251
 252         if (F2FS_HAS_BLOCKS(inode))
 253                 f2fs_truncate(inode);
 254
 255         remove_inode_page(inode);
 256         sb_end_intwrite(inode->i_sb);
 257 no_delete:
 258         clear_inode(inode);
 259 }