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 struct f2fs_iget_args {
  20         u64 ino;
  21         int on_free;
  22 };
  23
  24 void f2fs_set_inode_flags(struct inode *inode)
  25 {
  26         unsigned int flags = F2FS_I(inode)->i_flags;
  27
  28         inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE |
  29                         S_NOATIME | S_DIRSYNC);
  30
  31         if (flags & FS_SYNC_FL)
  32                 inode->i_flags |= S_SYNC;
  33         if (flags & FS_APPEND_FL)
  34                 inode->i_flags |= S_APPEND;
  35         if (flags & FS_IMMUTABLE_FL)
  36                 inode->i_flags |= S_IMMUTABLE;
  37         if (flags & FS_NOATIME_FL)
  38                 inode->i_flags |= S_NOATIME;
  39         if (flags & FS_DIRSYNC_FL)
  40                 inode->i_flags |= S_DIRSYNC;
  41 }
  42
  43 static int f2fs_iget_test(struct inode *inode, void *data)
  44 {
  45         struct f2fs_iget_args *args = data;
  46
  47         if (inode->i_ino != args->ino)
  48                 return 0;
  49         if (inode->i_state & (I_FREEING | I_WILL_FREE)) {
  50                 args->on_free = 1;
  51                 return 0;
  52         }
  53         return 1;
  54 }
  55
  56 struct inode *f2fs_iget_nowait(struct super_block *sb, unsigned long ino)
  57 {
  58         struct f2fs_iget_args args = {
  59                 .ino = ino,
  60                 .on_free = 0
  61         };
  62         struct inode *inode = ilookup5(sb, ino, f2fs_iget_test, &args);
  63
  64         if (inode)
  65                 return inode;
  66         if (!args.on_free)
  67                 return f2fs_iget(sb, ino);
  68         return ERR_PTR(-ENOENT);
  69 }
  70
  71 static int do_read_inode(struct inode *inode)
  72 {
  73         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  74         struct f2fs_inode_info *fi = F2FS_I(inode);
  75         struct page *node_page;
  76         struct f2fs_node *rn;
  77         struct f2fs_inode *ri;
  78
  79         /* Check if ino is within scope */
  80         check_nid_range(sbi, inode->i_ino);
  81
  82         node_page = get_node_page(sbi, inode->i_ino);
  83         if (IS_ERR(node_page))
  84                 return PTR_ERR(node_page);
  85
  86         rn = page_address(node_page);
  87         ri = &(rn->i);
  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->data_version = le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver) - 1;
 109         fi->i_advise = ri->i_advise;
 110         fi->i_pino = le32_to_cpu(ri->i_pino);
 111         get_extent_info(&fi->ext, ri->i_ext);
 112         f2fs_put_page(node_page, 1);
 113         return 0;
 114 }
 115
 116 struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
 117 {
 118         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 119         struct inode *inode;
 120         int ret;
 121
 122         inode = iget_locked(sb, ino);
 123         if (!inode)
 124                 return ERR_PTR(-ENOMEM);
 125         if (!(inode->i_state & I_NEW))
 126                 return inode;
 127         if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
 128                 goto make_now;
 129
 130         ret = do_read_inode(inode);
 131         if (ret)
 132                 goto bad_inode;
 133
 134         if (!sbi->por_doing && inode->i_nlink == 0) {
 135                 ret = -ENOENT;
 136                 goto bad_inode;
 137         }
 138
 139 make_now:
 140         if (ino == F2FS_NODE_INO(sbi)) {
 141                 inode->i_mapping->a_ops = &f2fs_node_aops;
 142                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 143         } else if (ino == F2FS_META_INO(sbi)) {
 144                 inode->i_mapping->a_ops = &f2fs_meta_aops;
 145                 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 146         } else if (S_ISREG(inode->i_mode)) {
 147                 inode->i_op = &f2fs_file_inode_operations;
 148                 inode->i_fop = &f2fs_file_operations;
 149                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 150         } else if (S_ISDIR(inode->i_mode)) {
 151                 inode->i_op = &f2fs_dir_inode_operations;
 152                 inode->i_fop = &f2fs_dir_operations;
 153                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 154                 mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER_MOVABLE |
 155                                 __GFP_ZERO);
 156         } else if (S_ISLNK(inode->i_mode)) {
 157                 inode->i_op = &f2fs_symlink_inode_operations;
 158                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 159         } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 160                         S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 161                 inode->i_op = &f2fs_special_inode_operations;
 162                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 163         } else {
 164                 ret = -EIO;
 165                 goto bad_inode;
 166         }
 167         unlock_new_inode(inode);
 168
 169         return inode;
 170
 171 bad_inode:
 172         iget_failed(inode);
 173         return ERR_PTR(ret);
 174 }
 175
 176 void update_inode(struct inode *inode, struct page *node_page)
 177 {
 178         struct f2fs_node *rn;
 179         struct f2fs_inode *ri;
 180
 181         wait_on_page_writeback(node_page);
 182
 183         rn = page_address(node_page);
 184         ri = &(rn->i);
 185
 186         ri->i_mode = cpu_to_le16(inode->i_mode);
 187         ri->i_advise = F2FS_I(inode)->i_advise;
 188         ri->i_uid = cpu_to_le32(i_uid_read(inode));
 189         ri->i_gid = cpu_to_le32(i_gid_read(inode));
 190         ri->i_links = cpu_to_le32(inode->i_nlink);
 191         ri->i_size = cpu_to_le64(i_size_read(inode));
 192         ri->i_blocks = cpu_to_le64(inode->i_blocks);
 193         set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);
 194
 195         ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 196         ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 197         ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 198         ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 199         ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 200         ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 201         ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
 202         ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
 203         ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
 204         ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
 205         ri->i_generation = cpu_to_le32(inode->i_generation);
 206         set_page_dirty(node_page);
 207 }
 208
 209 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 210 {
 211         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 212         struct page *node_page;
 213         bool need_lock = false;
 214
 215         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 216                         inode->i_ino == F2FS_META_INO(sbi))
 217                 return 0;
 218
 219         node_page = get_node_page(sbi, inode->i_ino);
 220         if (IS_ERR(node_page))
 221                 return PTR_ERR(node_page);
 222
 223         if (!PageDirty(node_page)) {
 224                 need_lock = true;
 225                 f2fs_put_page(node_page, 1);
 226                 mutex_lock(&sbi->write_inode);
 227                 node_page = get_node_page(sbi, inode->i_ino);
 228                 if (IS_ERR(node_page)) {
 229                         mutex_unlock(&sbi->write_inode);
 230                         return PTR_ERR(node_page);
 231                 }
 232         }
 233         update_inode(inode, node_page);
 234         f2fs_put_page(node_page, 1);
 235         if (need_lock)
 236                 mutex_unlock(&sbi->write_inode);
 237         return 0;
 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
 247         truncate_inode_pages(&inode->i_data, 0);
 248
 249         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 250                         inode->i_ino == F2FS_META_INO(sbi))
 251                 goto no_delete;
 252
 253         BUG_ON(atomic_read(&F2FS_I(inode)->dirty_dents));
 254         remove_dirty_dir_inode(inode);
 255
 256         if (inode->i_nlink || is_bad_inode(inode))
 257                 goto no_delete;
 258
 259         set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
 260         i_size_write(inode, 0);
 261
 262         if (F2FS_HAS_BLOCKS(inode))
 263                 f2fs_truncate(inode);
 264
 265         remove_inode_page(inode);
 266 no_delete:
 267         clear_inode(inode);
 268 }