LXR linux/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
  21void 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
  40static int do_read_inode(struct inode *inode)
  41{
  42        struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  43        struct f2fs_inode_info *fi = F2FS_I(inode);
  44        struct page *node_page;
  45        struct f2fs_node *rn;
  46        struct f2fs_inode *ri;
  47
  48        /* Check if ino is within scope */
  49        if (check_nid_range(sbi, inode->i_ino)) {
  50                f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
  51                         (unsigned long) inode->i_ino);
  52                return -EINVAL;
  53        }
  54
  55        node_page = get_node_page(sbi, inode->i_ino);
  56        if (IS_ERR(node_page))
  57                return PTR_ERR(node_page);
  58
  59        rn = page_address(node_page);
  60        ri = &(rn->i);
  61
  62        inode->i_mode = le16_to_cpu(ri->i_mode);
  63        i_uid_write(inode, le32_to_cpu(ri->i_uid));
  64        i_gid_write(inode, le32_to_cpu(ri->i_gid));
  65        set_nlink(inode, le32_to_cpu(ri->i_links));
  66        inode->i_size = le64_to_cpu(ri->i_size);
  67        inode->i_blocks = le64_to_cpu(ri->i_blocks);
  68
  69        inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
  70        inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
  71        inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
  72        inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
  73        inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
  74        inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
  75        inode->i_generation = le32_to_cpu(ri->i_generation);
  76        if (ri->i_addr[0])
  77                inode->i_rdev = old_decode_dev(le32_to_cpu(ri->i_addr[0]));
  78        else
  79                inode->i_rdev = new_decode_dev(le32_to_cpu(ri->i_addr[1]));
  80
  81        fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
  82        fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
  83        fi->i_flags = le32_to_cpu(ri->i_flags);
  84        fi->flags = 0;
  85        fi->i_advise = ri->i_advise;
  86        fi->i_pino = le32_to_cpu(ri->i_pino);
  87        get_extent_info(&fi->ext, ri->i_ext);
  88        f2fs_put_page(node_page, 1);
  89        return 0;
  90}
  91
  92struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
  93{
  94        struct f2fs_sb_info *sbi = F2FS_SB(sb);
  95        struct inode *inode;
  96        int ret = 0;
  97
  98        inode = iget_locked(sb, ino);
  99        if (!inode)
 100                return ERR_PTR(-ENOMEM);
 101
 102        if (!(inode->i_state & I_NEW)) {
 103                trace_f2fs_iget(inode);
 104                return inode;
 105        }
 106        if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
 107                goto make_now;
 108
 109        ret = do_read_inode(inode);
 110        if (ret)
 111                goto bad_inode;
 112make_now:
 113        if (ino == F2FS_NODE_INO(sbi)) {
 114                inode->i_mapping->a_ops = &f2fs_node_aops;
 115                mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 116        } else if (ino == F2FS_META_INO(sbi)) {
 117                inode->i_mapping->a_ops = &f2fs_meta_aops;
 118                mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 119        } else if (S_ISREG(inode->i_mode)) {
 120                inode->i_op = &f2fs_file_inode_operations;
 121                inode->i_fop = &f2fs_file_operations;
 122                inode->i_mapping->a_ops = &f2fs_dblock_aops;
 123        } else if (S_ISDIR(inode->i_mode)) {
 124                inode->i_op = &f2fs_dir_inode_operations;
 125                inode->i_fop = &f2fs_dir_operations;
 126                inode->i_mapping->a_ops = &f2fs_dblock_aops;
 127                mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 128        } else if (S_ISLNK(inode->i_mode)) {
 129                inode->i_op = &f2fs_symlink_inode_operations;
 130                inode->i_mapping->a_ops = &f2fs_dblock_aops;
 131        } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 132                        S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 133                inode->i_op = &f2fs_special_inode_operations;
 134                init_special_inode(inode, inode->i_mode, inode->i_rdev);
 135        } else {
 136                ret = -EIO;
 137                goto bad_inode;
 138        }
 139        unlock_new_inode(inode);
 140        trace_f2fs_iget(inode);
 141        return inode;
 142
 143bad_inode:
 144        iget_failed(inode);
 145        trace_f2fs_iget_exit(inode, ret);
 146        return ERR_PTR(ret);
 147}
 148
 149void update_inode(struct inode *inode, struct page *node_page)
 150{
 151        struct f2fs_node *rn;
 152        struct f2fs_inode *ri;
 153
 154        wait_on_page_writeback(node_page);
 155
 156        rn = page_address(node_page);
 157        ri = &(rn->i);
 158
 159        ri->i_mode = cpu_to_le16(inode->i_mode);
 160        ri->i_advise = F2FS_I(inode)->i_advise;
 161        ri->i_uid = cpu_to_le32(i_uid_read(inode));
 162        ri->i_gid = cpu_to_le32(i_gid_read(inode));
 163        ri->i_links = cpu_to_le32(inode->i_nlink);
 164        ri->i_size = cpu_to_le64(i_size_read(inode));
 165        ri->i_blocks = cpu_to_le64(inode->i_blocks);
 166        set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);
 167
 168        ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
 169        ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 170        ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
 171        ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 172        ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 173        ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 174        ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
 175        ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
 176        ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
 177        ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
 178        ri->i_generation = cpu_to_le32(inode->i_generation);
 179
 180        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 181                if (old_valid_dev(inode->i_rdev)) {
 182                        ri->i_addr[0] =
 183                                cpu_to_le32(old_encode_dev(inode->i_rdev));
 184                        ri->i_addr[1] = 0;
 185                } else {
 186                        ri->i_addr[0] = 0;
 187                        ri->i_addr[1] =
 188                                cpu_to_le32(new_encode_dev(inode->i_rdev));
 189                        ri->i_addr[2] = 0;
 190                }
 191        }
 192
 193        set_cold_node(inode, node_page);
 194        set_page_dirty(node_page);
 195        clear_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 196}
 197
 198int update_inode_page(struct inode *inode)
 199{
 200        struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 201        struct page *node_page;
 202
 203        node_page = get_node_page(sbi, inode->i_ino);
 204        if (IS_ERR(node_page))
 205                return PTR_ERR(node_page);
 206
 207        update_inode(inode, node_page);
 208        f2fs_put_page(node_page, 1);
 209        return 0;
 210}
 211
 212int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 213{
 214        struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 215        int ret, ilock;
 216
 217        if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 218                        inode->i_ino == F2FS_META_INO(sbi))
 219                return 0;
 220
 221        if (!is_inode_flag_set(F2FS_I(inode), FI_DIRTY_INODE))
 222                return 0;
 223
 224        if (wbc)
 225                f2fs_balance_fs(sbi);
 226
 227        /*
 228         * We need to lock here to prevent from producing dirty node pages
 229         * during the urgent cleaning time when runing out of free sections.
 230         */
 231        ilock = mutex_lock_op(sbi);
 232        ret = update_inode_page(inode);
 233        mutex_unlock_op(sbi, ilock);
 234        return ret;
 235}
 236
 237/*
 238 * Called at the last iput() if i_nlink is zero
 239 */
 240void f2fs_evict_inode(struct inode *inode)
 241{
 242        struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 243        int ilock;
 244
 245        trace_f2fs_evict_inode(inode);
 246        truncate_inode_pages(&inode->i_data, 0);
 247
 248        if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 249                        inode->i_ino == F2FS_META_INO(sbi))
 250                goto no_delete;
 251
 252        BUG_ON(atomic_read(&F2FS_I(inode)->dirty_dents));
 253        remove_dirty_dir_inode(inode);
 254
 255        if (inode->i_nlink || is_bad_inode(inode))
 256                goto no_delete;
 257
 258        sb_start_intwrite(inode->i_sb);
 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        ilock = mutex_lock_op(sbi);
 266        remove_inode_page(inode);
 267        mutex_unlock_op(sbi, ilock);
 268
 269        sb_end_intwrite(inode->i_sb);
 270no_delete:
 271        clear_inode(inode);
 272}
 273