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 = old_decode_dev(le32_to_cpu(ri->i_addr[0]));
  46                 else
  47                         inode->i_rdev = new_decode_dev(le32_to_cpu(ri->i_addr[1]));
  48         }
  49 }
  50
  51 static void __set_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
  52 {
  53         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
  54                 if (old_valid_dev(inode->i_rdev)) {
  55                         ri->i_addr[0] = cpu_to_le32(old_encode_dev(inode->i_rdev));
  56                         ri->i_addr[1] = 0;
  57                 } else {
  58                         ri->i_addr[0] = 0;
  59                         ri->i_addr[1] = cpu_to_le32(new_encode_dev(inode->i_rdev));
  60                         ri->i_addr[2] = 0;
  61                 }
  62         }
  63 }
  64
  65 static int do_read_inode(struct inode *inode)
  66 {
  67         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  68         struct f2fs_inode_info *fi = F2FS_I(inode);
  69         struct page *node_page;
  70         struct f2fs_inode *ri;
  71
  72         /* Check if ino is within scope */
  73         if (check_nid_range(sbi, inode->i_ino)) {
  74                 f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
  75                          (unsigned long) inode->i_ino);
  76                 return -EINVAL;
  77         }
  78
  79         node_page = get_node_page(sbi, inode->i_ino);
  80         if (IS_ERR(node_page))
  81                 return PTR_ERR(node_page);
  82
  83         ri = F2FS_INODE(node_page);
  84
  85         inode->i_mode = le16_to_cpu(ri->i_mode);
  86         i_uid_write(inode, le32_to_cpu(ri->i_uid));
  87         i_gid_write(inode, le32_to_cpu(ri->i_gid));
  88         set_nlink(inode, le32_to_cpu(ri->i_links));
  89         inode->i_size = le64_to_cpu(ri->i_size);
  90         inode->i_blocks = le64_to_cpu(ri->i_blocks);
  91
  92         inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
  93         inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
  94         inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
  95         inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
  96         inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
  97         inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
  98         inode->i_generation = le32_to_cpu(ri->i_generation);
  99
 100         fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
 101         fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
 102         fi->i_flags = le32_to_cpu(ri->i_flags);
 103         fi->flags = 0;
 104         fi->i_advise = ri->i_advise;
 105         fi->i_pino = le32_to_cpu(ri->i_pino);
 106
 107         get_extent_info(&fi->ext, ri->i_ext);
 108         get_inline_info(fi, ri);
 109
 110         /* get rdev by using inline_info */
 111         __get_inode_rdev(inode, ri);
 112
 113         f2fs_put_page(node_page, 1);
 114         return 0;
 115 }
 116
 117 struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
 118 {
 119         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 120         struct inode *inode;
 121         int ret = 0;
 122
 123         inode = iget_locked(sb, ino);
 124         if (!inode)
 125                 return ERR_PTR(-ENOMEM);
 126
 127         if (!(inode->i_state & I_NEW)) {
 128                 trace_f2fs_iget(inode);
 129                 return inode;
 130         }
 131         if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
 132                 goto make_now;
 133
 134         ret = do_read_inode(inode);
 135         if (ret)
 136                 goto bad_inode;
 137 make_now:
 138         if (ino == F2FS_NODE_INO(sbi)) {
 139                 inode->i_mapping->a_ops = &f2fs_node_aops;
 140                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 141         } else if (ino == F2FS_META_INO(sbi)) {
 142                 inode->i_mapping->a_ops = &f2fs_meta_aops;
 143                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 144         } else if (S_ISREG(inode->i_mode)) {
 145                 inode->i_op = &f2fs_file_inode_operations;
 146                 inode->i_fop = &f2fs_file_operations;
 147                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 148         } else if (S_ISDIR(inode->i_mode)) {
 149                 inode->i_op = &f2fs_dir_inode_operations;
 150                 inode->i_fop = &f2fs_dir_operations;
 151                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 152                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 153         } else if (S_ISLNK(inode->i_mode)) {
 154                 inode->i_op = &f2fs_symlink_inode_operations;
 155                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 156         } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 157                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 158                 inode->i_op = &f2fs_special_inode_operations;
 159                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 160         } else {
 161                 ret = -EIO;
 162                 goto bad_inode;
 163         }
 164         unlock_new_inode(inode);
 165         trace_f2fs_iget(inode);
 166         return inode;
 167
 168 bad_inode:
 169         iget_failed(inode);
 170         trace_f2fs_iget_exit(inode, ret);
 171         return ERR_PTR(ret);
 172 }
 173
 174 void update_inode(struct inode *inode, struct page *node_page)
 175 {
 176         struct f2fs_inode *ri;
 177
 178         f2fs_wait_on_page_writeback(node_page, NODE, false);
 179
 180         ri = F2FS_INODE(node_page);
 181
 182         ri->i_mode = cpu_to_le16(inode->i_mode);
 183         ri->i_advise = F2FS_I(inode)->i_advise;
 184         ri->i_uid = cpu_to_le32(i_uid_read(inode));
 185         ri->i_gid = cpu_to_le32(i_gid_read(inode));
 186         ri->i_links = cpu_to_le32(inode->i_nlink);
 187         ri->i_size = cpu_to_le64(i_size_read(inode));
 188         ri->i_blocks = cpu_to_le64(inode->i_blocks);
 189         set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);
 190         set_raw_inline(F2FS_I(inode), ri);
 191
 192         ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 193         ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 194         ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 195         ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 196         ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 197         ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 198         ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
 199         ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
 200         ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
 201         ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
 202         ri->i_generation = cpu_to_le32(inode->i_generation);
 203
 204         __set_inode_rdev(inode, ri);
 205         set_cold_node(inode, node_page);
 206         set_page_dirty(node_page);
 207
 208         clear_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 209 }
 210
 211 int update_inode_page(struct inode *inode)
 212 {
 213         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 214         struct page *node_page;
 215
 216         node_page = get_node_page(sbi, inode->i_ino);
 217         if (IS_ERR(node_page))
 218                 return PTR_ERR(node_page);
 219
 220         update_inode(inode, node_page);
 221         f2fs_put_page(node_page, 1);
 222         return 0;
 223 }
 224
 225 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 226 {
 227         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 228         int ret;
 229
 230         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 231                         inode->i_ino == F2FS_META_INO(sbi))
 232                 return 0;
 233
 234         if (!is_inode_flag_set(F2FS_I(inode), FI_DIRTY_INODE))
 235                 return 0;
 236
 237         /*
 238          * We need to lock here to prevent from producing dirty node pages
 239          * during the urgent cleaning time when runing out of free sections.
 240          */
 241         f2fs_lock_op(sbi);
 242         ret = update_inode_page(inode);
 243         f2fs_unlock_op(sbi);
 244
 245         if (wbc)
 246                 f2fs_balance_fs(sbi);
 247
 248         return ret;
 249 }
 250
 251 /*
 252  * Called at the last iput() if i_nlink is zero
 253  */
 254 void f2fs_evict_inode(struct inode *inode)
 255 {
 256         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 257
 258         trace_f2fs_evict_inode(inode);
 259         truncate_inode_pages(&inode->i_data, 0);
 260
 261         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 262                         inode->i_ino == F2FS_META_INO(sbi))
 263                 goto no_delete;
 264
 265         f2fs_bug_on(atomic_read(&F2FS_I(inode)->dirty_dents));
 266         remove_dirty_dir_inode(inode);
 267
 268         if (inode->i_nlink || is_bad_inode(inode))
 269                 goto no_delete;
 270
 271         sb_start_intwrite(inode->i_sb);
 272         set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
 273         i_size_write(inode, 0);
 274
 275         if (F2FS_HAS_BLOCKS(inode))
 276                 f2fs_truncate(inode);
 277
 278         f2fs_lock_op(sbi);
 279         remove_inode_page(inode);
 280         f2fs_unlock_op(sbi);
 281
 282         sb_end_intwrite(inode->i_sb);
 283 no_delete:
 284         clear_inode(inode);
 285 }