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authorJoern Engel <joern@logfs.org>2010-05-04 19:41:09 +0200
committerJoern Engel <joern@logfs.org>2010-05-04 19:41:09 +0200
commit05ebad852901cf9127a743df6ea10c0e8b1590c3 (patch)
treeeb5e200d3ca4ae15bec2cbf3731055ff29e7f73c /fs/logfs/readwrite.c
parent20503664b008e17976bff1fdbc693c77ebd6f6c9 (diff)
downloadop-kernel-dev-05ebad852901cf9127a743df6ea10c0e8b1590c3.zip
op-kernel-dev-05ebad852901cf9127a743df6ea10c0e8b1590c3.tar.gz
logfs: commit reservations under space pressure
Ensures we only return -ENOSPC when there really is no space. Signed-off-by: Joern Engel <joern@logfs.org>
Diffstat (limited to 'fs/logfs/readwrite.c')
-rw-r--r--fs/logfs/readwrite.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/fs/logfs/readwrite.c b/fs/logfs/readwrite.c
index e37cee3..0718d11 100644
--- a/fs/logfs/readwrite.c
+++ b/fs/logfs/readwrite.c
@@ -1095,17 +1095,25 @@ static int logfs_reserve_bytes(struct inode *inode, int bytes)
int get_page_reserve(struct inode *inode, struct page *page)
{
struct logfs_super *super = logfs_super(inode->i_sb);
+ struct logfs_block *block = logfs_block(page);
int ret;
- if (logfs_block(page) && logfs_block(page)->reserved_bytes)
+ if (block && block->reserved_bytes)
return 0;
logfs_get_wblocks(inode->i_sb, page, WF_LOCK);
- ret = logfs_reserve_bytes(inode, 6 * LOGFS_MAX_OBJECTSIZE);
+ while ((ret = logfs_reserve_bytes(inode, 6 * LOGFS_MAX_OBJECTSIZE)) &&
+ !list_empty(&super->s_writeback_list)) {
+ block = list_entry(super->s_writeback_list.next,
+ struct logfs_block, alias_list);
+ block->ops->write_block(block);
+ }
if (!ret) {
alloc_data_block(inode, page);
- logfs_block(page)->reserved_bytes += 6 * LOGFS_MAX_OBJECTSIZE;
+ block = logfs_block(page);
+ block->reserved_bytes += 6 * LOGFS_MAX_OBJECTSIZE;
super->s_dirty_pages += 6 * LOGFS_MAX_OBJECTSIZE;
+ list_move_tail(&block->alias_list, &super->s_writeback_list);
}
logfs_put_wblocks(inode->i_sb, page, WF_LOCK);
return ret;
@@ -2251,6 +2259,7 @@ int logfs_init_rw(struct super_block *sb)
int min_fill = 3 * super->s_no_blocks;
INIT_LIST_HEAD(&super->s_object_alias);
+ INIT_LIST_HEAD(&super->s_writeback_list);
mutex_init(&super->s_write_mutex);
super->s_block_pool = mempool_create_kmalloc_pool(min_fill,
sizeof(struct logfs_block));
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