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                 WARN_ON(1);
  82                 return -EINVAL;
  83         }
  84
  85         node_page = get_node_page(sbi, inode->i_ino);
  86         if (IS_ERR(node_page))
  87                 return PTR_ERR(node_page);
  88
  89         ri = F2FS_INODE(node_page);
  90
  91         inode->i_mode = le16_to_cpu(ri->i_mode);
  92         i_uid_write(inode, le32_to_cpu(ri->i_uid));
  93         i_gid_write(inode, le32_to_cpu(ri->i_gid));
  94         set_nlink(inode, le32_to_cpu(ri->i_links));
  95         inode->i_size = le64_to_cpu(ri->i_size);
  96         inode->i_blocks = le64_to_cpu(ri->i_blocks);
  97
  98         inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
  99         inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
 100         inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
 101         inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
 102         inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
 103         inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
 104         inode->i_generation = le32_to_cpu(ri->i_generation);
 105
 106         fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
 107         fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
 108         fi->i_flags = le32_to_cpu(ri->i_flags);
 109         fi->flags = 0;
 110         fi->i_advise = ri->i_advise;
 111         fi->i_pino = le32_to_cpu(ri->i_pino);
 112         fi->i_dir_level = ri->i_dir_level;
 113
 114         get_extent_info(&fi->ext, ri->i_ext);
 115         get_inline_info(fi, ri);
 116
 117         /* get rdev by using inline_info */
 118         __get_inode_rdev(inode, ri);
 119
 120         f2fs_put_page(node_page, 1);
 121         return 0;
 122 }
 123
 124 struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
 125 {
 126         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 127         struct inode *inode;
 128         int ret = 0;
 129
 130         inode = iget_locked(sb, ino);
 131         if (!inode)
 132                 return ERR_PTR(-ENOMEM);
 133
 134         if (!(inode->i_state & I_NEW)) {
 135                 trace_f2fs_iget(inode);
 136                 return inode;
 137         }
 138         if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
 139                 goto make_now;
 140
 141         ret = do_read_inode(inode);
 142         if (ret)
 143                 goto bad_inode;
 144 make_now:
 145         if (ino == F2FS_NODE_INO(sbi)) {
 146                 inode->i_mapping->a_ops = &f2fs_node_aops;
 147                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 148         } else if (ino == F2FS_META_INO(sbi)) {
 149                 inode->i_mapping->a_ops = &f2fs_meta_aops;
 150                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 151         } else if (S_ISREG(inode->i_mode)) {
 152                 inode->i_op = &f2fs_file_inode_operations;
 153                 inode->i_fop = &f2fs_file_operations;
 154                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 155         } else if (S_ISDIR(inode->i_mode)) {
 156                 inode->i_op = &f2fs_dir_inode_operations;
 157                 inode->i_fop = &f2fs_dir_operations;
 158                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 159                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 160         } else if (S_ISLNK(inode->i_mode)) {
 161                 inode->i_op = &f2fs_symlink_inode_operations;
 162                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 163         } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 164                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 165                 inode->i_op = &f2fs_special_inode_operations;
 166                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 167         } else {
 168                 ret = -EIO;
 169                 goto bad_inode;
 170         }
 171         unlock_new_inode(inode);
 172         trace_f2fs_iget(inode);
 173         return inode;
 174
 175 bad_inode:
 176         iget_failed(inode);
 177         trace_f2fs_iget_exit(inode, ret);
 178         return ERR_PTR(ret);
 179 }
 180
 181 void update_inode(struct inode *inode, struct page *node_page)
 182 {
 183         struct f2fs_inode *ri;
 184
 185         f2fs_wait_on_page_writeback(node_page, NODE);
 186
 187         ri = F2FS_INODE(node_page);
 188
 189         ri->i_mode = cpu_to_le16(inode->i_mode);
 190         ri->i_advise = F2FS_I(inode)->i_advise;
 191         ri->i_uid = cpu_to_le32(i_uid_read(inode));
 192         ri->i_gid = cpu_to_le32(i_gid_read(inode));
 193         ri->i_links = cpu_to_le32(inode->i_nlink);
 194         ri->i_size = cpu_to_le64(i_size_read(inode));
 195         ri->i_blocks = cpu_to_le64(inode->i_blocks);
 196         set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);
 197         set_raw_inline(F2FS_I(inode), ri);
 198
 199         ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 200         ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 201         ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 202         ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 203         ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 204         ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 205         ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
 206         ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
 207         ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
 208         ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
 209         ri->i_generation = cpu_to_le32(inode->i_generation);
 210         ri->i_dir_level = F2FS_I(inode)->i_dir_level;
 211
 212         __set_inode_rdev(inode, ri);
 213         set_cold_node(inode, node_page);
 214         set_page_dirty(node_page);
 215
 216         clear_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 217 }
 218
 219 void update_inode_page(struct inode *inode)
 220 {
 221         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 222         struct page *node_page;
 223 retry:
 224         node_page = get_node_page(sbi, inode->i_ino);
 225         if (IS_ERR(node_page)) {
 226                 int err = PTR_ERR(node_page);
 227                 if (err == -ENOMEM) {
 228                         cond_resched();
 229                         goto retry;
 230                 } else if (err != -ENOENT) {
 231                         f2fs_stop_checkpoint(sbi);
 232                 }
 233                 return;
 234         }
 235         update_inode(inode, node_page);
 236         f2fs_put_page(node_page, 1);
 237 }
 238
 239 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 240 {
 241         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 242
 243         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 244                         inode->i_ino == F2FS_META_INO(sbi))
 245                 return 0;
 246
 247         if (!is_inode_flag_set(F2FS_I(inode), FI_DIRTY_INODE))
 248                 return 0;
 249
 250         /*
 251          * We need to lock here to prevent from producing dirty node pages
 252          * during the urgent cleaning time when runing out of free sections.
 253          */
 254         f2fs_lock_op(sbi);
 255         update_inode_page(inode);
 256         f2fs_unlock_op(sbi);
 257
 258         if (wbc)
 259                 f2fs_balance_fs(sbi);
 260
 261         return 0;
 262 }
 263
 264 /*
 265  * Called at the last iput() if i_nlink is zero
 266  */
 267 void f2fs_evict_inode(struct inode *inode)
 268 {
 269         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 270
 271         trace_f2fs_evict_inode(inode);
 272         truncate_inode_pages_final(&inode->i_data);
 273
 274         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 275                         inode->i_ino == F2FS_META_INO(sbi))
 276                 goto no_delete;
 277
 278         f2fs_bug_on(get_dirty_dents(inode));
 279         remove_dirty_dir_inode(inode);
 280
 281         if (inode->i_nlink || is_bad_inode(inode))
 282                 goto no_delete;
 283
 284         sb_start_intwrite(inode->i_sb);
 285         set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
 286         i_size_write(inode, 0);
 287
 288         if (F2FS_HAS_BLOCKS(inode))
 289                 f2fs_truncate(inode);
 290
 291         f2fs_lock_op(sbi);
 292         remove_inode_page(inode);
 293         stat_dec_inline_inode(inode);
 294         f2fs_unlock_op(sbi);
 295
 296         sb_end_intwrite(inode->i_sb);
 297 no_delete:
 298         clear_inode(inode);
 299         invalidate_mapping_pages(NODE_MAPPING(sbi), inode->i_ino, inode->i_ino);
 300 }