PWN-Hunter/android_kernel_xiaomi_sdm845
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[PATCH] splice: fix unlocking of page on error ->prepare_write()

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Looking at generic_file_buffered_write(), we need to unlock_page() if
prepare write fails and it isn't due to racing with truncate().

Also trim the size if ->prepare_write() fails, if we have to.

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe 2006-05-03 10:35:10 +02:00 committed by Jens Axboe
parent 5dea5176e5
commit bfc4ee39fd
1 changed files with 16 additions and 3 deletions
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19
fs/splice.c
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@ -647,11 +647,24 @@ static int pipe_to_file(struct pipe_inode_info *info, struct pipe_buffer *buf,
}
ret = mapping->a_ops->prepare_write(file, page, offset, offset+this_len);
if (ret == AOP_TRUNCATED_PAGE) {
if (unlikely(ret)) {
loff_t isize = i_size_read(mapping->host);
if (ret != AOP_TRUNCATED_PAGE)
unlock_page(page);
page_cache_release(page);
goto find_page;
} else if (ret)
if (ret == AOP_TRUNCATED_PAGE)
goto find_page;
/*
* prepare_write() may have instantiated a few blocks
* outside i_size. Trim these off again.
*/
if (sd->pos + this_len > isize)
vmtruncate(mapping->host, isize);
goto out;
}
if (buf->page != page) {
/*