fs/f2fs/inline.c

   1 /*
   2  * fs/f2fs/inline.c
   3  * Copyright (c) 2013, Intel Corporation
   4  * Authors: Huajun Li <huajun.li@intel.com>
   5  *          Haicheng Li <haicheng.li@intel.com>
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/fs.h>
  12 #include <linux/f2fs_fs.h>
  13
  14 #include "f2fs.h"
  15
  16 bool f2fs_may_inline(struct inode *inode)
  17 {
  18         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  19         block_t nr_blocks;
  20         loff_t i_size;
  21
  22         if (!test_opt(sbi, INLINE_DATA))
  23                 return false;
  24
  25         nr_blocks = F2FS_I(inode)->i_xattr_nid ? 3 : 2;
  26         if (inode->i_blocks > nr_blocks)
  27                 return false;
  28
  29         i_size = i_size_read(inode);
  30         if (i_size > MAX_INLINE_DATA)
  31                 return false;
  32
  33         return true;
  34 }
  35
  36 int f2fs_read_inline_data(struct inode *inode, struct page *page)
  37 {
  38         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  39         struct page *ipage;
  40         void *src_addr, *dst_addr;
  41
  42         ipage = get_node_page(sbi, inode->i_ino);
  43         if (IS_ERR(ipage))
  44                 return PTR_ERR(ipage);
  45
  46         zero_user_segment(page, INLINE_DATA_OFFSET,
  47                                 INLINE_DATA_OFFSET + MAX_INLINE_DATA);
  48
  49         /* Copy the whole inline data block */
  50         src_addr = inline_data_addr(ipage);
  51         dst_addr = kmap(page);
  52         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
  53         kunmap(page);
  54         f2fs_put_page(ipage, 1);
  55
  56         SetPageUptodate(page);
  57         unlock_page(page);
  58
  59         return 0;
  60 }
  61
  62 static int __f2fs_convert_inline_data(struct inode *inode, struct page *page)
  63 {
  64         int err;
  65         struct page *ipage;
  66         struct dnode_of_data dn;
  67         void *src_addr, *dst_addr;
  68         block_t new_blk_addr;
  69         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  70         struct f2fs_io_info fio = {
  71                 .type = DATA,
  72                 .rw = WRITE_SYNC | REQ_PRIO,
  73         };
  74
  75         f2fs_lock_op(sbi);
  76         ipage = get_node_page(sbi, inode->i_ino);
  77         if (IS_ERR(ipage))
  78                 return PTR_ERR(ipage);
  79
  80         /*
  81          * i_addr[0] is not used for inline data,
  82          * so reserving new block will not destroy inline data
  83          */
  84         set_new_dnode(&dn, inode, ipage, ipage, 0);
  85         err = f2fs_reserve_block(&dn, 0);
  86         if (err) {
  87                 f2fs_put_page(ipage, 1);
  88                 f2fs_unlock_op(sbi);
  89                 return err;
  90         }
  91
  92         zero_user_segment(page, 0, PAGE_CACHE_SIZE);
  93
  94         /* Copy the whole inline data block */
  95         src_addr = inline_data_addr(ipage);
  96         dst_addr = kmap(page);
  97         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
  98         kunmap(page);
  99         SetPageUptodate(page);
 100
 101         /* write data page to try to make data consistent */
 102         set_page_writeback(page);
 103         write_data_page(page, &dn, &new_blk_addr, &fio);
 104         update_extent_cache(new_blk_addr, &dn);
 105         f2fs_wait_on_page_writeback(page, DATA, true);
 106
 107         /* clear inline data and flag after data writeback */
 108         zero_user_segment(ipage, INLINE_DATA_OFFSET,
 109                                  INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 110         clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 111         stat_dec_inline_inode(inode);
 112
 113         sync_inode_page(&dn);
 114         f2fs_put_page(ipage, 1);
 115         f2fs_unlock_op(sbi);
 116
 117         return err;
 118 }
 119
 120 int f2fs_convert_inline_data(struct inode *inode, pgoff_t to_size)
 121 {
 122         struct page *page;
 123         int err;
 124
 125         if (!f2fs_has_inline_data(inode))
 126                 return 0;
 127         else if (to_size <= MAX_INLINE_DATA)
 128                 return 0;
 129
 130         page = grab_cache_page_write_begin(inode->i_mapping, 0, AOP_FLAG_NOFS);
 131         if (!page)
 132                 return -ENOMEM;
 133
 134         err = __f2fs_convert_inline_data(inode, page);
 135         f2fs_put_page(page, 1);
 136         return err;
 137 }
 138
 139 int f2fs_write_inline_data(struct inode *inode,
 140                            struct page *page, unsigned size)
 141 {
 142         void *src_addr, *dst_addr;
 143         struct page *ipage;
 144         struct dnode_of_data dn;
 145         int err;
 146
 147         set_new_dnode(&dn, inode, NULL, NULL, 0);
 148         err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 149         if (err)
 150                 return err;
 151         ipage = dn.inode_page;
 152
 153         zero_user_segment(ipage, INLINE_DATA_OFFSET,
 154                                  INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 155         src_addr = kmap(page);
 156         dst_addr = inline_data_addr(ipage);
 157         memcpy(dst_addr, src_addr, size);
 158         kunmap(page);
 159
 160         /* Release the first data block if it is allocated */
 161         if (!f2fs_has_inline_data(inode)) {
 162                 truncate_data_blocks_range(&dn, 1);
 163                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 164                 stat_inc_inline_inode(inode);
 165         }
 166
 167         sync_inode_page(&dn);
 168         f2fs_put_dnode(&dn);
 169
 170         return 0;
 171 }
 172
 173 int recover_inline_data(struct inode *inode, struct page *npage)
 174 {
 175         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 176         struct f2fs_inode *ri = NULL;
 177         void *src_addr, *dst_addr;
 178         struct page *ipage;
 179
 180         /*
 181          * The inline_data recovery policy is as follows.
 182          * [prev.] [next] of inline_data flag
 183          *    o       o  -> recover inline_data
 184          *    o       x  -> remove inline_data, and then recover data blocks
 185          *    x       o  -> remove inline_data, and then recover inline_data
 186          *    x       x  -> recover data blocks
 187          */
 188         if (IS_INODE(npage))
 189                 ri = F2FS_INODE(npage);
 190
 191         if (f2fs_has_inline_data(inode) &&
 192                         ri && ri->i_inline & F2FS_INLINE_DATA) {
 193 process_inline:
 194                 ipage = get_node_page(sbi, inode->i_ino);
 195                 f2fs_bug_on(IS_ERR(ipage));
 196
 197                 src_addr = inline_data_addr(npage);
 198                 dst_addr = inline_data_addr(ipage);
 199                 memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 200                 update_inode(inode, ipage);
 201                 f2fs_put_page(ipage, 1);
 202                 return -1;
 203         }
 204
 205         if (f2fs_has_inline_data(inode)) {
 206                 ipage = get_node_page(sbi, inode->i_ino);
 207                 f2fs_bug_on(IS_ERR(ipage));
 208                 zero_user_segment(ipage, INLINE_DATA_OFFSET,
 209                                  INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 210                 clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 211                 update_inode(inode, ipage);
 212                 f2fs_put_page(ipage, 1);
 213         } else if (ri && ri->i_inline & F2FS_INLINE_DATA) {
 214                 truncate_blocks(inode, 0);
 215                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 216                 goto process_inline;
 217         }
 218         return 0;
 219 }