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writeback: separate starting of sync vs opportunistic writeback

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bdi_start_writeback() is currently split into two paths, one for
WB_SYNC_NONE and one for WB_SYNC_ALL. Add bdi_sync_writeback()
for WB_SYNC_ALL writeback and let bdi_start_writeback() handle
only WB_SYNC_NONE.

Push down the writeback_control allocation and only accept the
parameters that make sense for each function. This cleans up
the API considerably.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2009-09-16 15:13:54 +02:00
commit b6e51316da
5 changed files with 75 additions and 95 deletions
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20
fs/ubifs/budget.c
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@ -54,29 +54,15 @@
* @nr_to_write: how many dirty pages to write-back
*
* This function shrinks UBIFS liability by means of writing back some amount
* of dirty inodes and their pages. Returns the amount of pages which were
* written back. The returned value does not include dirty inodes which were
* synchronized.
* of dirty inodes and their pages.
*
* Note, this function synchronizes even VFS inodes which are locked
* (@i_mutex) by the caller of the budgeting function, because write-back does
* not touch @i_mutex.
*/
static int shrink_liability(struct ubifs_info *c, int nr_to_write)
static void shrink_liability(struct ubifs_info *c, int nr_to_write)
{
int nr_written;
nr_written = writeback_inodes_sb(c->vfs_sb);
if (!nr_written) {
/*
* Re-try again but wait on pages/inodes which are being
* written-back concurrently (e.g., by pdflush).
*/
nr_written = sync_inodes_sb(c->vfs_sb);
}
dbg_budg("%d pages were written back", nr_written);
return nr_written;
writeback_inodes_sb(c->vfs_sb);
}
/**