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iomap: Refactor iomap_write_delalloc_punch() function out 

This patch factors iomap_write_delalloc_punch() function out. This function
is resposible for actual punch out operation.
The reason for doing this is, to avoid deep indentation when we bring
punch-out of individual non-dirty blocks within a dirty folio in a later
patch (which adds per-block dirty status handling to iomap) to avoid
delalloc block leak.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Ritesh Harjani (IBM) 2023-07-10 14:12:24 -07:00
parent 0af2b37d8e
commit 7f79d85b52
1 changed files with 34 additions and 20 deletions
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54
fs/iomap/buffered-io.c
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@ -883,6 +883,33 @@ iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i,
}
EXPORT_SYMBOL_GPL(iomap_file_buffered_write);
static int iomap_write_delalloc_punch(struct inode *inode, struct folio *folio,
loff_t *punch_start_byte, loff_t start_byte, loff_t end_byte,
iomap_punch_t punch)
{
int ret = 0;
if (!folio_test_dirty(folio))
return ret;
/* if dirty, punch up to offset */
if (start_byte > *punch_start_byte) {
ret = punch(inode, *punch_start_byte,
start_byte - *punch_start_byte);
if (ret)
return ret;
}
/*
* Make sure the next punch start is correctly bound to
* the end of this data range, not the end of the folio.
*/
*punch_start_byte = min_t(loff_t, end_byte,
folio_pos(folio) + folio_size(folio));
return ret;
}
/*
* Scan the data range passed to us for dirty page cache folios. If we find a
* dirty folio, punch out the preceeding range and update the offset from which
@ -906,6 +933,7 @@ static int iomap_write_delalloc_scan(struct inode *inode,
{
while (start_byte < end_byte) {
struct folio *folio;
int ret;
/* grab locked page */
folio = filemap_lock_folio(inode->i_mapping,
@ -916,26 +944,12 @@ static int iomap_write_delalloc_scan(struct inode *inode,
continue;
}
/* if dirty, punch up to offset */
if (folio_test_dirty(folio)) {
if (start_byte > *punch_start_byte) {
int error;
error = punch(inode, *punch_start_byte,
start_byte - *punch_start_byte);
if (error) {
folio_unlock(folio);
folio_put(folio);
return error;
}
}
/*
* Make sure the next punch start is correctly bound to
* the end of this data range, not the end of the folio.
*/
*punch_start_byte = min_t(loff_t, end_byte,
folio_pos(folio) + folio_size(folio));
ret = iomap_write_delalloc_punch(inode, folio, punch_start_byte,
start_byte, end_byte, punch);
if (ret) {
folio_unlock(folio);
folio_put(folio);
return ret;
}
/* move offset to start of next folio in range */