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| author | Christoph Hellwig <hch@lst.de> | 2011-07-08 14:34:05 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2011-07-08 14:34:05 +0200 |
| commit | 680a647b49fa52de0b37b8bc58a3a8c4bc76b262 (patch) | |
| tree | a91fce973179b9e4d8ce77ca4f95fc8efca3255f /fs | |
| parent | 1316d4da3f632d5843d5a446203e73067dc40f09 (diff) | |
| download | op-kernel-dev-680a647b49fa52de0b37b8bc58a3a8c4bc76b262.zip op-kernel-dev-680a647b49fa52de0b37b8bc58a3a8c4bc76b262.tar.gz | |
xfs: PF_FSTRANS should never be set in ->writepage
Now that we reject direct reclaim in addition to always using GFP_NOFS
allocation there's no chance we'll ever end up in ->writepage with
PF_FSTRANS set. Add a WARN_ON if we hit this case, and stop checking
if we'd actually need to start a transaction.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_aops.c | 17 |
1 files changed, 3 insertions, 14 deletions
diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c index 79ce38b..60e1364 100644 --- a/fs/xfs/linux-2.6/xfs_aops.c +++ b/fs/xfs/linux-2.6/xfs_aops.c @@ -894,11 +894,6 @@ out_invalidate: * For unwritten space on the page we need to start the conversion to * regular allocated space. * For any other dirty buffer heads on the page we should flush them. - * - * If we detect that a transaction would be required to flush the page, we - * have to check the process flags first, if we are already in a transaction - * or disk I/O during allocations is off, we need to fail the writepage and - * redirty the page. */ STATIC int xfs_vm_writepage( @@ -906,7 +901,6 @@ xfs_vm_writepage( struct writeback_control *wbc) { struct inode *inode = page->mapping->host; - int delalloc, unwritten; struct buffer_head *bh, *head; struct xfs_bmbt_irec imap; xfs_ioend_t *ioend = NULL, *iohead = NULL; @@ -938,15 +932,10 @@ xfs_vm_writepage( goto redirty; /* - * We need a transaction if there are delalloc or unwritten buffers - * on the page. - * - * If we need a transaction and the process flags say we are already - * in a transaction, or no IO is allowed then mark the page dirty - * again and leave the page as is. + * Given that we do not allow direct reclaim to call us, we should + * never be called while in a filesystem transaction. */ - xfs_count_page_state(page, &delalloc, &unwritten); - if ((current->flags & PF_FSTRANS) && (delalloc || unwritten)) + if (WARN_ON(current->flags & PF_FSTRANS)) goto redirty; /* Is this page beyond the end of the file? */ |
