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authorMingming Cao <cmm@us.ibm.com>2008-07-14 17:52:37 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-07-14 17:52:37 -0400
commitd2a1763791a634e315ec926b62829c1e88842c86 (patch)
tree75a701a89829ba7d728fdc19c30aa2794b9706b9 /fs/ext4/super.c
parente8ced39d5e8911c662d4d69a342b9d053eaaac4e (diff)
ext4: delayed allocation ENOSPC handling
This patch does block reservation for delayed allocation, to avoid ENOSPC later at page flush time. Blocks(data and metadata) are reserved at da_write_begin() time, the freeblocks counter is updated by then, and the number of reserved blocks is store in per inode counter. At the writepage time, the unused reserved meta blocks are returned back. At unlink/truncate time, reserved blocks are properly released. Updated fix from Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> to fix the oldallocator block reservation accounting with delalloc, added lock to guard the counters and also fix the reservation for meta blocks. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/super.c')
-rw-r--r--fs/ext4/super.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index de9d3d0eb20..25e2f2488cd 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -574,6 +574,11 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
INIT_LIST_HEAD(&ei->i_prealloc_list);
spin_lock_init(&ei->i_prealloc_lock);
jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
+ ei->i_reserved_data_blocks = 0;
+ ei->i_reserved_meta_blocks = 0;
+ ei->i_allocated_meta_blocks = 0;
+ ei->i_delalloc_reserved_flag = 0;
+ spin_lock_init(&(ei->i_block_reservation_lock));
return &ei->vfs_inode;
}