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         block_t nr_blocks;
  19         loff_t i_size;
  20
  21         if (!test_opt(F2FS_I_SB(inode), INLINE_DATA))
  22                 return false;
  23
  24         nr_blocks = F2FS_I(inode)->i_xattr_nid ? 3 : 2;
  25         if (inode->i_blocks > nr_blocks)
  26                 return false;
  27
  28         i_size = i_size_read(inode);
  29         if (i_size > MAX_INLINE_DATA)
  30                 return false;
  31
  32         return true;
  33 }
  34
  35 int f2fs_read_inline_data(struct inode *inode, struct page *page)
  36 {
  37         struct page *ipage;
  38         void *src_addr, *dst_addr;
  39
  40         if (page->index) {
  41                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
  42                 goto out;
  43         }
  44
  45         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
  46         if (IS_ERR(ipage)) {
  47                 unlock_page(page);
  48                 return PTR_ERR(ipage);
  49         }
  50
  51         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
  52
  53         /* Copy the whole inline data block */
  54         src_addr = inline_data_addr(ipage);
  55         dst_addr = kmap(page);
  56         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
  57         kunmap(page);
  58         f2fs_put_page(ipage, 1);
  59
  60 out:
  61         SetPageUptodate(page);
  62         unlock_page(page);
  63
  64         return 0;
  65 }
  66
  67 static int __f2fs_convert_inline_data(struct inode *inode, struct page *page)
  68 {
  69         int err = 0;
  70         struct page *ipage;
  71         struct dnode_of_data dn;
  72         void *src_addr, *dst_addr;
  73         block_t new_blk_addr;
  74         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  75         struct f2fs_io_info fio = {
  76                 .type = DATA,
  77                 .rw = WRITE_SYNC | REQ_PRIO,
  78         };
  79
  80         f2fs_lock_op(sbi);
  81         ipage = get_node_page(sbi, inode->i_ino);
  82         if (IS_ERR(ipage)) {
  83                 err = PTR_ERR(ipage);
  84                 goto out;
  85         }
  86
  87         /* someone else converted inline_data already */
  88         if (!f2fs_has_inline_data(inode))
  89                 goto out;
  90
  91         /*
  92          * i_addr[0] is not used for inline data,
  93          * so reserving new block will not destroy inline data
  94          */
  95         set_new_dnode(&dn, inode, ipage, NULL, 0);
  96         err = f2fs_reserve_block(&dn, 0);
  97         if (err)
  98                 goto out;
  99
 100         f2fs_wait_on_page_writeback(page, DATA);
 101         zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
 102
 103         /* Copy the whole inline data block */
 104         src_addr = inline_data_addr(ipage);
 105         dst_addr = kmap(page);
 106         memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 107         kunmap(page);
 108         SetPageUptodate(page);
 109
 110         /* write data page to try to make data consistent */
 111         set_page_writeback(page);
 112         write_data_page(page, &dn, &new_blk_addr, &fio);
 113         update_extent_cache(new_blk_addr, &dn);
 114         f2fs_wait_on_page_writeback(page, DATA);
 115
 116         /* clear inline data and flag after data writeback */
 117         zero_user_segment(ipage, INLINE_DATA_OFFSET,
 118                                  INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 119         clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 120         stat_dec_inline_inode(inode);
 121
 122         sync_inode_page(&dn);
 123         f2fs_put_dnode(&dn);
 124 out:
 125         f2fs_unlock_op(sbi);
 126         return err;
 127 }
 128
 129 int f2fs_convert_inline_data(struct inode *inode, pgoff_t to_size,
 130                                                 struct page *page)
 131 {
 132         struct page *new_page = page;
 133         int err;
 134
 135         if (!f2fs_has_inline_data(inode))
 136                 return 0;
 137         else if (to_size <= MAX_INLINE_DATA)
 138                 return 0;
 139
 140         if (!page || page->index != 0) {
 141                 new_page = grab_cache_page(inode->i_mapping, 0);
 142                 if (!new_page)
 143                         return -ENOMEM;
 144         }
 145
 146         err = __f2fs_convert_inline_data(inode, new_page);
 147         if (!page || page->index != 0)
 148                 f2fs_put_page(new_page, 1);
 149         return err;
 150 }
 151
 152 int f2fs_write_inline_data(struct inode *inode,
 153                                 struct page *page, unsigned size)
 154 {
 155         void *src_addr, *dst_addr;
 156         struct page *ipage;
 157         struct dnode_of_data dn;
 158         int err;
 159
 160         set_new_dnode(&dn, inode, NULL, NULL, 0);
 161         err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 162         if (err)
 163                 return err;
 164         ipage = dn.inode_page;
 165
 166         f2fs_wait_on_page_writeback(ipage, NODE);
 167         zero_user_segment(ipage, INLINE_DATA_OFFSET,
 168                                  INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 169         src_addr = kmap(page);
 170         dst_addr = inline_data_addr(ipage);
 171         memcpy(dst_addr, src_addr, size);
 172         kunmap(page);
 173
 174         /* Release the first data block if it is allocated */
 175         if (!f2fs_has_inline_data(inode)) {
 176                 truncate_data_blocks_range(&dn, 1);
 177                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 178                 stat_inc_inline_inode(inode);
 179         }
 180
 181         set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
 182         sync_inode_page(&dn);
 183         f2fs_put_dnode(&dn);
 184
 185         return 0;
 186 }
 187
 188 void truncate_inline_data(struct inode *inode, u64 from)
 189 {
 190         struct page *ipage;
 191
 192         if (from >= MAX_INLINE_DATA)
 193                 return;
 194
 195         ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 196         if (IS_ERR(ipage))
 197                 return;
 198
 199         f2fs_wait_on_page_writeback(ipage, NODE);
 200
 201         zero_user_segment(ipage, INLINE_DATA_OFFSET + from,
 202                                 INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 203         set_page_dirty(ipage);
 204         f2fs_put_page(ipage, 1);
 205 }
 206
 207 bool recover_inline_data(struct inode *inode, struct page *npage)
 208 {
 209         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 210         struct f2fs_inode *ri = NULL;
 211         void *src_addr, *dst_addr;
 212         struct page *ipage;
 213
 214         /*
 215          * The inline_data recovery policy is as follows.
 216          * [prev.] [next] of inline_data flag
 217          *    o       o  -> recover inline_data
 218          *    o       x  -> remove inline_data, and then recover data blocks
 219          *    x       o  -> remove inline_data, and then recover inline_data
 220          *    x       x  -> recover data blocks
 221          */
 222         if (IS_INODE(npage))
 223                 ri = F2FS_INODE(npage);
 224
 225         if (f2fs_has_inline_data(inode) &&
 226                         ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 227 process_inline:
 228                 ipage = get_node_page(sbi, inode->i_ino);
 229                 f2fs_bug_on(IS_ERR(ipage));
 230
 231                 f2fs_wait_on_page_writeback(ipage, NODE);
 232
 233                 src_addr = inline_data_addr(npage);
 234                 dst_addr = inline_data_addr(ipage);
 235                 memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 236                 update_inode(inode, ipage);
 237                 f2fs_put_page(ipage, 1);
 238                 return true;
 239         }
 240
 241         if (f2fs_has_inline_data(inode)) {
 242                 ipage = get_node_page(sbi, inode->i_ino);
 243                 f2fs_bug_on(IS_ERR(ipage));
 244                 f2fs_wait_on_page_writeback(ipage, NODE);
 245                 zero_user_segment(ipage, INLINE_DATA_OFFSET,
 246                                  INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 247                 clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 248                 update_inode(inode, ipage);
 249                 f2fs_put_page(ipage, 1);
 250         } else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 251                 truncate_blocks(inode, 0, false);
 252                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 253                 goto process_inline;
 254         }
 255         return false;
 256 }