xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Btrfs: Do more optimal file RA during shrinking and defrag

Browse Source 
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-04-28 09:02:36 -04:00
parent 3bf3d9e9c2
commit 8e7bf94fd5
2 changed files with 22 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
fs/btrfs/extent-tree.c
View File

@@ -2263,6 +2263,12 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
return 0;
}
static unsigned long calc_ra(unsigned long start, unsigned long last,
unsigned long nr)
{
return min(last, start + nr - 1);
}
static int noinline relocate_inode_pages(struct inode *inode, u64 start,
u64 len)
{
@@ -2275,6 +2281,8 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start,
struct page *page;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct file_ra_state *ra;
unsigned long total_read = 0;
unsigned long ra_pages;
ra = kzalloc(sizeof(*ra), GFP_NOFS);
@@ -2282,11 +2290,17 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start,
i = start >> PAGE_CACHE_SHIFT;
last_index = (start + len - 1) >> PAGE_CACHE_SHIFT;
ra_pages = BTRFS_I(inode)->root->fs_info->bdi.ra_pages;
file_ra_state_init(ra, inode->i_mapping);
btrfs_force_ra(inode->i_mapping, ra, NULL, i, last_index);
kfree(ra);
for (; i <= last_index; i++) {
if (total_read % ra_pages == 0) {
btrfs_force_ra(inode->i_mapping, ra, NULL, i,
calc_ra(i, last_index, ra_pages));
}
total_read++;
page = grab_cache_page(inode->i_mapping, i);
if (!page)
goto out_unlock;