btrfs: separate superblock items out of fs_info
fs_info has now ~9kb, more than fits into one page. This will cause
mount failure when memory is too fragmented. Top space consumers are
super block structures super_copy and super_for_commit, ~2.8kb each.
Allocate them dynamically. fs_info will be ~3.5kb. (measured on x86_64)
Add a wrapper for freeing fs_info and all of it's dynamically allocated
members.
Signed-off-by: David Sterba <dsterba@suse.cz>
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 33aae13..8f6e142 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -282,7 +282,7 @@
struct fstrim_range range;
u64 minlen = ULLONG_MAX;
u64 num_devices = 0;
- u64 total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
+ u64 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
int ret;
if (!capable(CAP_SYS_ADMIN))
@@ -1164,7 +1164,7 @@
mutex_unlock(&inode->i_mutex);
}
- disk_super = &root->fs_info->super_copy;
+ disk_super = root->fs_info->super_copy;
features = btrfs_super_incompat_flags(disk_super);
if (range->compress_type == BTRFS_COMPRESS_LZO) {
features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
@@ -2613,7 +2613,7 @@
return PTR_ERR(trans);
}
- dir_id = btrfs_super_root_dir(&root->fs_info->super_copy);
+ dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
dir_id, "default", 7, 1);
if (IS_ERR_OR_NULL(di)) {
@@ -2629,7 +2629,7 @@
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_free_path(path);
- disk_super = &root->fs_info->super_copy;
+ disk_super = root->fs_info->super_copy;
features = btrfs_super_incompat_flags(disk_super);
if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) {
features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL;