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jbd: change journal_invalidatepage() to accept length

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->invalidatepage() aop now accepts range to invalidate so we can make
use of it in journal_invalidatepage() and all the users in ext3 file
system. Also update ext3 trace point to print out length argument.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Lukas Czerner 2013-05-21 23:26:36 -04:00 committed by Theodore Ts'o
parent ca99fdd26b
commit d8c8900ac1
4 changed files with 25 additions and 14 deletions
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6
fs/ext3/inode.c
View File

@ -1830,15 +1830,15 @@ static void ext3_invalidatepage(struct page *page, unsigned int offset,
{
journal_t *journal = EXT3_JOURNAL(page->mapping->host);
trace_ext3_invalidatepage(page, offset);
trace_ext3_invalidatepage(page, offset, length);
/*
* If it's a full truncate we just forget about the pending dirtying
*/
if (offset == 0)
if (offset == 0 && length == PAGE_CACHE_SIZE)
ClearPageChecked(page);
journal_invalidatepage(journal, page, offset);
journal_invalidatepage(journal, page, offset, length);
}
static int ext3_releasepage(struct page *page, gfp_t wait)

19
fs/jbd/transaction.c
View File

@ -2019,16 +2019,20 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh,
* void journal_invalidatepage() - invalidate a journal page
* @journal: journal to use for flush
* @page: page to flush
* @offset: length of page to invalidate.
* @offset: offset of the range to invalidate
* @length: length of the range to invalidate
*
* Reap page buffers containing data after offset in page.
* Reap page buffers containing data in specified range in page.
*/
void journal_invalidatepage(journal_t *journal,
struct page *page,
unsigned long offset)
unsigned int offset,
unsigned int length)
{
struct buffer_head *head, *bh, *next;
unsigned int stop = offset + length;
unsigned int curr_off = 0;
int partial_page = (offset || length < PAGE_CACHE_SIZE);
int may_free = 1;
if (!PageLocked(page))
@ -2036,6 +2040,8 @@ void journal_invalidatepage(journal_t *journal,
if (!page_has_buffers(page))
return;
BUG_ON(stop > PAGE_CACHE_SIZE || stop < length);
/* We will potentially be playing with lists other than just the
* data lists (especially for journaled data mode), so be
* cautious in our locking. */
@ -2045,11 +2051,14 @@ void journal_invalidatepage(journal_t *journal,
unsigned int next_off = curr_off + bh->b_size;
next = bh->b_this_page;
if (next_off > stop)
return;
if (offset <= curr_off) {
/* This block is wholly outside the truncation point */
lock_buffer(bh);
may_free &= journal_unmap_buffer(journal, bh,
offset > 0);
partial_page);
unlock_buffer(bh);
}
curr_off = next_off;
@ -2057,7 +2066,7 @@ void journal_invalidatepage(journal_t *journal,
} while (bh != head);
if (!offset) {
if (!partial_page) {
if (may_free && try_to_free_buffers(page))
J_ASSERT(!page_has_buffers(page));
}

2
include/linux/jbd.h
View File

@ -840,7 +840,7 @@ extern void journal_release_buffer (handle_t *, struct buffer_head *);
extern int journal_forget (handle_t *, struct buffer_head *);
extern void journal_sync_buffer (struct buffer_head *);
extern void journal_invalidatepage(journal_t *,
struct page *, unsigned long);
struct page *, unsigned int, unsigned int);
extern int journal_try_to_free_buffers(journal_t *, struct page *, gfp_t);
extern int journal_stop(handle_t *);
extern int journal_flush (journal_t *);

12
include/trace/events/ext3.h
View File

@ -290,13 +290,14 @@ DEFINE_EVENT(ext3__page_op, ext3_releasepage,
);
TRACE_EVENT(ext3_invalidatepage,
TP_PROTO(struct page *page, unsigned long offset),
TP_PROTO(struct page *page, unsigned int offset, unsigned int length),
TP_ARGS(page, offset),
TP_ARGS(page, offset, length),
TP_STRUCT__entry(
__field( pgoff_t, index )
__field( unsigned long, offset )
__field( unsigned int, offset )
__field( unsigned int, length )
__field( ino_t, ino )
__field( dev_t, dev )
@ -305,14 +306,15 @@ TRACE_EVENT(ext3_invalidatepage,
TP_fast_assign(
__entry->index = page->index;
__entry->offset = offset;
__entry->length = length;
__entry->ino = page->mapping->host->i_ino;
__entry->dev = page->mapping->host->i_sb->s_dev;
),
TP_printk("dev %d,%d ino %lu page_index %lu offset %lu",
TP_printk("dev %d,%d ino %lu page_index %lu offset %u length %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->ino,
__entry->index, __entry->offset)
__entry->index, __entry->offset, __entry->length)
);
TRACE_EVENT(ext3_discard_blocks,