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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>
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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12
fs/logfs/file.c
View File

@ -161,7 +161,17 @@ static int logfs_writepage(struct page *page, struct writeback_control *wbc)
static void logfs_invalidatepage(struct page *page, unsigned long offset)
{
move_page_to_btree(page);
struct logfs_block *block = logfs_block(page);
if (block->reserved_bytes) {
struct super_block *sb = page->mapping->host->i_sb;
struct logfs_super *super = logfs_super(sb);
super->s_dirty_pages -= block->reserved_bytes;
block->ops->free_block(sb, block);
BUG_ON(bitmap_weight(block->alias_map, LOGFS_BLOCK_FACTOR));
} else
move_page_to_btree(page);
BUG_ON(PagePrivate(page) || page->private);
}

1
fs/logfs/logfs.h
View File

@ -394,6 +394,7 @@ struct logfs_super {
int s_lock_count;
mempool_t *s_block_pool; /* struct logfs_block pool */
mempool_t *s_shadow_pool; /* struct logfs_shadow pool */
struct list_head s_writeback_list; /* writeback pages */
/*
* Space accounting:
* - s_used_bytes specifies space used to store valid data objects.

15
fs/logfs/readwrite.c
View File

@ -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));