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logfs: commit reservations under space pressure

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Ensures we only return -ENOSPC when there really is no space.

Signed-off-by: Joern Engel <joern@logfs.org>
This commit is contained in:
Joern Engel
2010-05-04 19:41:09 +02:00
parent 20503664b0
commit 05ebad8529
3 changed files with 24 additions and 4 deletions
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15
fs/logfs/readwrite.c
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@@ -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));