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