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Add support for defragging files via btrfsctl -d. Avoid OOM on extent tree

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defrag.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-09-10 19:58:16 -04:00
committed by David Woodhouse
parent 8e21528f87
commit 86479a04ee
5 changed files with 100 additions and 18 deletions
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93
fs/btrfs/inode.c
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@@ -1904,6 +1904,70 @@ fail:
return ret;
}
static unsigned long force_ra(struct address_space *mapping,
struct file_ra_state *ra, struct file *file,
pgoff_t offset, pgoff_t last_index)
{
pgoff_t req_size;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
req_size = last_index - offset + 1;
offset = page_cache_readahead(mapping, ra, file, offset, req_size);
return offset;
#else
req_size = min(last_index - offset + 1, (pgoff_t)128);
page_cache_sync_readahead(mapping, ra, file, offset, req_size);
return offset + req_size;
#endif
}
int btrfs_defrag_file(struct file *file) {
struct inode *inode = file->f_path.dentry->d_inode;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct page *page;
unsigned long last_index;
unsigned long ra_index = 0;
u64 page_start;
u64 page_end;
unsigned long i;
mutex_lock(&inode->i_mutex);
last_index = inode->i_size >> PAGE_CACHE_SHIFT;
for (i = 0; i <= last_index; i++) {
if (i == ra_index) {
ra_index = force_ra(inode->i_mapping, &file->f_ra,
file, ra_index, last_index);
}
page = grab_cache_page(inode->i_mapping, i);
if (!page)
goto out_unlock;
if (!PageUptodate(page)) {
btrfs_readpage(NULL, page);
lock_page(page);
if (!PageUptodate(page)) {
unlock_page(page);
page_cache_release(page);
goto out_unlock;
}
}
page_start = page->index << PAGE_CACHE_SHIFT;
page_end = page_start + PAGE_CACHE_SIZE - 1;
lock_extent(em_tree, page_start, page_end, GFP_NOFS);
set_extent_delalloc(em_tree, page_start,
page_end, GFP_NOFS);
unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
set_page_dirty(page);
unlock_page(page);
page_cache_release(page);
balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
}
out_unlock:
mutex_unlock(&inode->i_mutex);
return 0;
}
int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int
cmd, unsigned long arg)
{
@@ -1948,10 +2012,14 @@ int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int
break;
case BTRFS_IOC_DEFRAG:
mutex_lock(&root->fs_info->fs_mutex);
btrfs_defrag_root(root, 0);
btrfs_defrag_root(root->fs_info->extent_root, 0);
mutex_unlock(&root->fs_info->fs_mutex);
if (S_ISDIR(inode->i_mode)) {
mutex_lock(&root->fs_info->fs_mutex);
btrfs_defrag_root(root, 0);
btrfs_defrag_root(root->fs_info->extent_root, 0);
mutex_unlock(&root->fs_info->fs_mutex);
} else if (S_ISREG(inode->i_mode)) {
btrfs_defrag_file(filp);
}
ret = 0;
break;
default:
@@ -2018,7 +2086,7 @@ void btrfs_destroy_cachep(void)
kmem_cache_destroy(btrfs_path_cachep);
}
static struct kmem_cache *cache_create(const char *name, size_t size,
struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
unsigned long extra_flags,
void (*ctor)(void *, struct kmem_cache *,
unsigned long))
@@ -2033,27 +2101,28 @@ static struct kmem_cache *cache_create(const char *name, size_t size,
int btrfs_init_cachep(void)
{
btrfs_inode_cachep = cache_create("btrfs_inode_cache",
btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
sizeof(struct btrfs_inode),
0, init_once);
if (!btrfs_inode_cachep)
goto fail;
btrfs_trans_handle_cachep = cache_create("btrfs_trans_handle_cache",
sizeof(struct btrfs_trans_handle),
0, NULL);
btrfs_trans_handle_cachep =
btrfs_cache_create("btrfs_trans_handle_cache",
sizeof(struct btrfs_trans_handle),
0, NULL);
if (!btrfs_trans_handle_cachep)
goto fail;
btrfs_transaction_cachep = cache_create("btrfs_transaction_cache",
btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
sizeof(struct btrfs_transaction),
0, NULL);
if (!btrfs_transaction_cachep)
goto fail;
btrfs_path_cachep = cache_create("btrfs_path_cache",
btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
sizeof(struct btrfs_transaction),
0, NULL);
if (!btrfs_path_cachep)
goto fail;
btrfs_bit_radix_cachep = cache_create("btrfs_radix", 256,
btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
SLAB_DESTROY_BY_RCU, NULL);
if (!btrfs_bit_radix_cachep)
goto fail;