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         if (page->index) {
  43                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
  44                 goto out;
  45         }
  46
  47         ipage = get_node_page(sbi, inode->i_ino);
  48         if (IS_ERR(ipage)) {
  49                 unlock_page(page);
  50                 return PTR_ERR(ipage);
  51         }
  52
  53         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
  54
  55         /* Copy the whole inline data block */
  56         src_addr = inline_data_addr(ipage);
  57         dst_addr = kmap(page);
  58         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
  59         kunmap(page);
  60         f2fs_put_page(ipage, 1);
  61
  62 out:
  63         SetPageUptodate(page);
  64         unlock_page(page);
  65
  66         return 0;
  67 }
  68
  69 static int __f2fs_convert_inline_data(struct inode *inode, struct page *page)
  70 {
  71         int err;
  72         struct page *ipage;
  73         struct dnode_of_data dn;
  74         void *src_addr, *dst_addr;
  75         block_t new_blk_addr;
  76         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  77         struct f2fs_io_info fio = {
  78                 .type = DATA,
  79                 .rw = WRITE_SYNC | REQ_PRIO,
  80         };
  81
  82         f2fs_lock_op(sbi);
  83         ipage = get_node_page(sbi, inode->i_ino);
  84         if (IS_ERR(ipage)) {
  85                 err = PTR_ERR(ipage);
  86                 goto out;
  87         }
  88
  89         /*
  90          * i_addr[0] is not used for inline data,
  91          * so reserving new block will not destroy inline data
  92          */
  93         set_new_dnode(&dn, inode, ipage, NULL, 0);
  94         err = f2fs_reserve_block(&dn, 0);
  95         if (err)
  96                 goto out;
  97
  98         f2fs_wait_on_page_writeback(page, DATA);
  99         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
 100
 101         /* Copy the whole inline data block */
 102         src_addr = inline_data_addr(ipage);
 103         dst_addr = kmap(page);
 104         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 105         kunmap(page);
 106         SetPageUptodate(page);
 107
 108         /* write data page to try to make data consistent */
 109         set_page_writeback(page);
 110         write_data_page(page, &dn, &new_blk_addr, &fio);
 111         update_extent_cache(new_blk_addr, &dn);
 112         f2fs_wait_on_page_writeback(page, DATA);
 113
 114         /* clear inline data and flag after data writeback */
 115         zero_user_segment(ipage, INLINE_DATA_OFFSET,
 116                                  INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 117         clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 118         stat_dec_inline_inode(inode);
 119
 120         sync_inode_page(&dn);
 121         f2fs_put_dnode(&dn);
 122 out:
 123         f2fs_unlock_op(sbi);
 124         return err;
 125 }
 126
 127 int f2fs_convert_inline_data(struct inode *inode, pgoff_t to_size)
 128 {
 129         struct page *page;
 130         int err;
 131
 132         if (!f2fs_has_inline_data(inode))
 133                 return 0;
 134         else if (to_size <= MAX_INLINE_DATA)
 135                 return 0;
 136
 137         page = grab_cache_page(inode->i_mapping, 0);
 138         if (!page)
 139                 return -ENOMEM;
 140
 141         err = __f2fs_convert_inline_data(inode, page);
 142         f2fs_put_page(page, 1);
 143         return err;
 144 }
 145
 146 int f2fs_write_inline_data(struct inode *inode,
 147                            struct page *page, unsigned size)
 148 {
 149         void *src_addr, *dst_addr;
 150         struct page *ipage;
 151         struct dnode_of_data dn;
 152         int err;
 153
 154         set_new_dnode(&dn, inode, NULL, NULL, 0);
 155         err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 156         if (err)
 157                 return err;
 158         ipage = dn.inode_page;
 159
 160         f2fs_wait_on_page_writeback(ipage, NODE);
 161         zero_user_segment(ipage, INLINE_DATA_OFFSET,
 162                                  INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 163         src_addr = kmap(page);
 164         dst_addr = inline_data_addr(ipage);
 165         memcpy(dst_addr, src_addr, size);
 166         kunmap(page);
 167
 168         /* Release the first data block if it is allocated */
 169         if (!f2fs_has_inline_data(inode)) {
 170                 truncate_data_blocks_range(&dn, 1);
 171                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 172                 stat_inc_inline_inode(inode);
 173         }
 174
 175         sync_inode_page(&dn);
 176         f2fs_put_dnode(&dn);
 177
 178         return 0;
 179 }
 180
 181 void truncate_inline_data(struct inode *inode, u64 from)
 182 {
 183         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 184         struct page *ipage;
 185
 186         if (from >= MAX_INLINE_DATA)
 187                 return;
 188
 189         ipage = get_node_page(sbi, inode->i_ino);
 190         if (IS_ERR(ipage))
 191                 return;
 192
 193         f2fs_wait_on_page_writeback(ipage, NODE);
 194
 195         zero_user_segment(ipage, INLINE_DATA_OFFSET + from,
 196                                 INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 197         set_page_dirty(ipage);
 198         f2fs_put_page(ipage, 1);
 199 }
 200
 201 int recover_inline_data(struct inode *inode, struct page *npage)
 202 {
 203         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 204         struct f2fs_inode *ri = NULL;
 205         void *src_addr, *dst_addr;
 206         struct page *ipage;
 207
 208         /*
 209          * The inline_data recovery policy is as follows.
 210          * [prev.] [next] of inline_data flag
 211          *    o       o  -> recover inline_data
 212          *    o       x  -> remove inline_data, and then recover data blocks
 213          *    x       o  -> remove inline_data, and then recover inline_data
 214          *    x       x  -> recover data blocks
 215          */
 216         if (IS_INODE(npage))
 217                 ri = F2FS_INODE(npage);
 218
 219         if (f2fs_has_inline_data(inode) &&
 220                         ri && ri->i_inline & F2FS_INLINE_DATA) {
 221 process_inline:
 222                 ipage = get_node_page(sbi, inode->i_ino);
 223                 f2fs_bug_on(IS_ERR(ipage));
 224
 225                 f2fs_wait_on_page_writeback(ipage, NODE);
 226
 227                 src_addr = inline_data_addr(npage);
 228                 dst_addr = inline_data_addr(ipage);
 229                 memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 230                 update_inode(inode, ipage);
 231                 f2fs_put_page(ipage, 1);
 232                 return -1;
 233         }
 234
 235         if (f2fs_has_inline_data(inode)) {
 236                 ipage = get_node_page(sbi, inode->i_ino);
 237                 f2fs_bug_on(IS_ERR(ipage));
 238                 f2fs_wait_on_page_writeback(ipage, NODE);
 239                 zero_user_segment(ipage, INLINE_DATA_OFFSET,
 240                                  INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 241                 clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 242                 update_inode(inode, ipage);
 243                 f2fs_put_page(ipage, 1);
 244         } else if (ri && ri->i_inline & F2FS_INLINE_DATA) {
 245                 truncate_blocks(inode, 0);
 246                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 247                 goto process_inline;
 248         }
 249         return 0;
 250 }