From 33b4d47f5e24b986f486d7de9a2df915ad1fdfbc Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Tue, 22 Sep 2009 14:45:50 -0400 Subject: [PATCH] Btrfs: deal with NULL space info After a balance it is briefly possible for the space info field in the inode to be NULL. This adds some checks to make sure things properly deal with the NULL value. Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 5f3544e5f3cb..1b9b87870f51 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -2778,6 +2778,8 @@ int btrfs_check_metadata_free_space(struct btrfs_root *root) /* get the space info for where the metadata will live */ alloc_target = btrfs_get_alloc_profile(root, 0); meta_sinfo = __find_space_info(info, alloc_target); + if (!meta_sinfo) + goto alloc; again: spin_lock(&meta_sinfo->lock); @@ -2795,7 +2797,7 @@ int btrfs_check_metadata_free_space(struct btrfs_root *root) if (!meta_sinfo->full) { meta_sinfo->force_alloc = 1; spin_unlock(&meta_sinfo->lock); - +alloc: trans = btrfs_start_transaction(root, 1); if (!trans) return -ENOMEM; @@ -2803,6 +2805,10 @@ int btrfs_check_metadata_free_space(struct btrfs_root *root) ret = do_chunk_alloc(trans, root->fs_info->extent_root, 2 * 1024 * 1024, alloc_target, 0); btrfs_end_transaction(trans, root); + if (!meta_sinfo) { + meta_sinfo = __find_space_info(info, + alloc_target); + } goto again; } spin_unlock(&meta_sinfo->lock); @@ -2838,6 +2844,9 @@ int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode, bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); data_sinfo = BTRFS_I(inode)->space_info; + if (!data_sinfo) + goto alloc; + again: /* make sure we have enough space to handle the data first */ spin_lock(&data_sinfo->lock); @@ -2856,7 +2865,7 @@ int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode, data_sinfo->force_alloc = 1; spin_unlock(&data_sinfo->lock); - +alloc: alloc_target = btrfs_get_alloc_profile(root, 1); trans = btrfs_start_transaction(root, 1); if (!trans) @@ -2868,6 +2877,11 @@ int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode, btrfs_end_transaction(trans, root); if (ret) return ret; + + if (!data_sinfo) { + btrfs_set_inode_space_info(root, inode); + data_sinfo = BTRFS_I(inode)->space_info; + } goto again; } spin_unlock(&data_sinfo->lock);