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f2fs: check truncation of mapping after lock_page

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We call lock_page when we need to update a page after readpage.
Between grab and lock page, the page can be truncated by other thread.
So, we should check the page after lock_page whether it was truncated or not.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2013-04-26 11:55:17 +09:00
parent 55008d845d
commit afcb7ca01f
4 changed files with 39 additions and 7 deletions
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4
fs/f2fs/checkpoint.c
View File

@ -65,6 +65,10 @@ struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
goto repeat;
lock_page(page);
if (page->mapping != mapping) {
f2fs_put_page(page, 1);
goto repeat;
}
out:
mark_page_accessed(page);
return page;

18
fs/f2fs/data.c
View File

@ -240,7 +240,7 @@ struct page *get_lock_data_page(struct inode *inode, pgoff_t index)
if (dn.data_blkaddr == NULL_ADDR)
return ERR_PTR(-ENOENT);
repeat:
page = grab_cache_page(mapping, index);
if (!page)
return ERR_PTR(-ENOMEM);
@ -260,6 +260,10 @@ struct page *get_lock_data_page(struct inode *inode, pgoff_t index)
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
}
if (page->mapping != mapping) {
f2fs_put_page(page, 1);
goto repeat;
}
return page;
}
@ -291,7 +295,7 @@ struct page *get_new_data_page(struct inode *inode, pgoff_t index,
}
}
f2fs_put_dnode(&dn);
repeat:
page = grab_cache_page(mapping, index);
if (!page)
return ERR_PTR(-ENOMEM);
@ -311,6 +315,10 @@ struct page *get_new_data_page(struct inode *inode, pgoff_t index,
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
}
if (page->mapping != mapping) {
f2fs_put_page(page, 1);
goto repeat;
}
}
if (new_i_size &&
@ -611,7 +619,7 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
*fsdata = NULL;
f2fs_balance_fs(sbi);
repeat:
page = grab_cache_page_write_begin(mapping, index, flags);
if (!page)
return -ENOMEM;
@ -656,6 +664,10 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
f2fs_put_page(page, 1);
return -EIO;
}
if (page->mapping != mapping) {
f2fs_put_page(page, 1);
goto repeat;
}
}
out:
SetPageUptodate(page);

4
fs/f2fs/file.c
View File

@ -217,6 +217,10 @@ static void truncate_partial_data_page(struct inode *inode, u64 from)
return;
lock_page(page);
if (page->mapping != inode->i_mapping) {
f2fs_put_page(page, 1);
return;
}
wait_on_page_writeback(page);
zero_user(page, offset, PAGE_CACHE_SIZE - offset);
set_page_dirty(page);

20
fs/f2fs/node.c
View File

@ -674,6 +674,7 @@ static int truncate_partial_nodes(struct dnode_of_data *dn,
int truncate_inode_blocks(struct inode *inode, pgoff_t from)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct address_space *node_mapping = sbi->node_inode->i_mapping;
int err = 0, cont = 1;
int level, offset[4], noffset[4];
unsigned int nofs = 0;
@ -684,7 +685,7 @@ int truncate_inode_blocks(struct inode *inode, pgoff_t from)
trace_f2fs_truncate_inode_blocks_enter(inode, from);
level = get_node_path(from, offset, noffset);
restart:
page = get_node_page(sbi, inode->i_ino);
if (IS_ERR(page)) {
trace_f2fs_truncate_inode_blocks_exit(inode, PTR_ERR(page));
@ -748,6 +749,10 @@ int truncate_inode_blocks(struct inode *inode, pgoff_t from)
if (offset[1] == 0 &&
rn->i.i_nid[offset[0] - NODE_DIR1_BLOCK]) {
lock_page(page);
if (page->mapping != node_mapping) {
f2fs_put_page(page, 1);
goto restart;
}
wait_on_page_writeback(page);
rn->i.i_nid[offset[0] - NODE_DIR1_BLOCK] = 0;
set_page_dirty(page);
@ -916,7 +921,7 @@ struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
struct address_space *mapping = sbi->node_inode->i_mapping;
struct page *page;
int err;
repeat:
page = grab_cache_page(mapping, nid);
if (!page)
return ERR_PTR(-ENOMEM);
@ -932,6 +937,10 @@ struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
}
if (page->mapping != mapping) {
f2fs_put_page(page, 1);
goto repeat;
}
got_it:
BUG_ON(nid != nid_of_node(page));
mark_page_accessed(page);
@ -955,7 +964,7 @@ struct page *get_node_page_ra(struct page *parent, int start)
nid = get_nid(parent, start, false);
if (!nid)
return ERR_PTR(-ENOENT);
repeat:
page = grab_cache_page(mapping, nid);
if (!page)
return ERR_PTR(-ENOMEM);
@ -981,7 +990,10 @@ struct page *get_node_page_ra(struct page *parent, int start)
blk_finish_plug(&plug);
lock_page(page);
if (page->mapping != mapping) {
f2fs_put_page(page, 1);
goto repeat;
}
page_hit:
if (!PageUptodate(page)) {
f2fs_put_page(page, 1);