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ext4: fix data corruption in data=journal mode

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am: a5a9cf387d

Change-Id: Ia3c5c062ed2c7f59128ea30be63a55ef69b20d20
This commit is contained in:
Jan Kara
2017-03-12 08:21:45 +00:00
committed by android-build-merger
parent e4c56d9ea0 a5a9cf387d
commit 2cff3a2733
1 changed files with 13 additions and 10 deletions
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23
fs/ext4/inode.c
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@@ -1391,7 +1391,9 @@ errout:
* set the buffer to be dirty, since in data=journalled mode we need
* to call ext4_handle_dirty_metadata() instead.
*/
static void zero_new_buffers(struct page *page, unsigned from, unsigned to)
static void ext4_journalled_zero_new_buffers(handle_t *handle,
struct page *page,
unsigned from, unsigned to)
{
unsigned int block_start = 0, block_end;
struct buffer_head *head, *bh;
@@ -1408,7 +1410,7 @@ static void zero_new_buffers(struct page *page, unsigned from, unsigned to)
size = min(to, block_end) - start;
zero_user(page, start, size);
set_buffer_uptodate(bh);
write_end_fn(handle, bh);
}
clear_buffer_new(bh);
}
@@ -1441,15 +1443,16 @@ static int ext4_journalled_write_end(struct file *file,
if (ext4_has_inline_data(inode))
copied = ext4_write_inline_data_end(inode, pos, len,
copied, page);
else {
if (copied < len) {
if (!PageUptodate(page))
copied = 0;
zero_new_buffers(page, from+copied, to);
}
else if (unlikely(copied < len) && !PageUptodate(page)) {
copied = 0;
ext4_journalled_zero_new_buffers(handle, page, from, to);
} else {
if (unlikely(copied < len))
ext4_journalled_zero_new_buffers(handle, page,
from + copied, to);
ret = ext4_walk_page_buffers(handle, page_buffers(page), from,
to, &partial, write_end_fn);
from + copied, &partial,
write_end_fn);
if (!partial)
SetPageUptodate(page);
}