From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/fs/btrfs/disk-io.c | 99 +++++++++++++++++++++++++++++++++++++++++++++----
1 files changed, 90 insertions(+), 9 deletions(-)
diff --git a/kernel/fs/btrfs/disk-io.c b/kernel/fs/btrfs/disk-io.c
index f2abd8b..0e25a3f 100644
--- a/kernel/fs/btrfs/disk-io.c
+++ b/kernel/fs/btrfs/disk-io.c
@@ -220,7 +220,7 @@
crypto_shash_update(shash, kaddr + BTRFS_CSUM_SIZE,
PAGE_SIZE - BTRFS_CSUM_SIZE);
- for (i = 1; i < num_pages; i++) {
+ for (i = 1; i < num_pages && INLINE_EXTENT_BUFFER_PAGES > 1; i++) {
kaddr = page_address(buf->pages[i]);
crypto_shash_update(shash, kaddr, PAGE_SIZE);
}
@@ -2246,6 +2246,26 @@
fs_info->csum_shash = csum_shash;
+ /*
+ * Check if the checksum implementation is a fast accelerated one.
+ * As-is this is a bit of a hack and should be replaced once the csum
+ * implementations provide that information themselves.
+ */
+ switch (csum_type) {
+ case BTRFS_CSUM_TYPE_CRC32:
+ if (!strstr(crypto_shash_driver_name(csum_shash), "generic"))
+ set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags);
+ break;
+ case BTRFS_CSUM_TYPE_XXHASH:
+ set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags);
+ break;
+ default:
+ break;
+ }
+
+ btrfs_info(fs_info, "using %s (%s) checksum algorithm",
+ btrfs_super_csum_name(csum_type),
+ crypto_shash_driver_name(csum_shash));
return 0;
}
@@ -2476,21 +2496,18 @@
ret = -EINVAL;
}
- if (memcmp(fs_info->fs_devices->fsid, fs_info->super_copy->fsid,
- BTRFS_FSID_SIZE)) {
+ if (memcmp(fs_info->fs_devices->fsid, sb->fsid, BTRFS_FSID_SIZE) != 0) {
btrfs_err(fs_info,
"superblock fsid doesn't match fsid of fs_devices: %pU != %pU",
- fs_info->super_copy->fsid, fs_info->fs_devices->fsid);
+ sb->fsid, fs_info->fs_devices->fsid);
ret = -EINVAL;
}
- if (btrfs_fs_incompat(fs_info, METADATA_UUID) &&
- memcmp(fs_info->fs_devices->metadata_uuid,
- fs_info->super_copy->metadata_uuid, BTRFS_FSID_SIZE)) {
+ if (memcmp(fs_info->fs_devices->metadata_uuid, btrfs_sb_fsid_ptr(sb),
+ BTRFS_FSID_SIZE) != 0) {
btrfs_err(fs_info,
"superblock metadata_uuid doesn't match metadata uuid of fs_devices: %pU != %pU",
- fs_info->super_copy->metadata_uuid,
- fs_info->fs_devices->metadata_uuid);
+ btrfs_sb_fsid_ptr(sb), fs_info->fs_devices->metadata_uuid);
ret = -EINVAL;
}
@@ -4518,7 +4535,11 @@
*/
inode = igrab(&btrfs_inode->vfs_inode);
if (inode) {
+ unsigned int nofs_flag;
+
+ nofs_flag = memalloc_nofs_save();
invalidate_inode_pages2(inode->i_mapping);
+ memalloc_nofs_restore(nofs_flag);
iput(inode);
}
spin_lock(&root->delalloc_lock);
@@ -4623,7 +4644,12 @@
inode = cache->io_ctl.inode;
if (inode) {
+ unsigned int nofs_flag;
+
+ nofs_flag = memalloc_nofs_save();
invalidate_inode_pages2(inode->i_mapping);
+ memalloc_nofs_restore(nofs_flag);
+
BTRFS_I(inode)->generation = 0;
cache->io_ctl.inode = NULL;
iput(inode);
@@ -4763,3 +4789,58 @@
return 0;
}
+
+int btrfs_find_highest_objectid(struct btrfs_root *root, u64 *objectid)
+{
+ struct btrfs_path *path;
+ int ret;
+ struct extent_buffer *l;
+ struct btrfs_key search_key;
+ struct btrfs_key found_key;
+ int slot;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ search_key.objectid = BTRFS_LAST_FREE_OBJECTID;
+ search_key.type = -1;
+ search_key.offset = (u64)-1;
+ ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
+ if (ret < 0)
+ goto error;
+ BUG_ON(ret == 0); /* Corruption */
+ if (path->slots[0] > 0) {
+ slot = path->slots[0] - 1;
+ l = path->nodes[0];
+ btrfs_item_key_to_cpu(l, &found_key, slot);
+ *objectid = max_t(u64, found_key.objectid,
+ BTRFS_FIRST_FREE_OBJECTID - 1);
+ } else {
+ *objectid = BTRFS_FIRST_FREE_OBJECTID - 1;
+ }
+ ret = 0;
+error:
+ btrfs_free_path(path);
+ return ret;
+}
+
+int btrfs_find_free_objectid(struct btrfs_root *root, u64 *objectid)
+{
+ int ret;
+ mutex_lock(&root->objectid_mutex);
+
+ if (unlikely(root->highest_objectid >= BTRFS_LAST_FREE_OBJECTID)) {
+ btrfs_warn(root->fs_info,
+ "the objectid of root %llu reaches its highest value",
+ root->root_key.objectid);
+ ret = -ENOSPC;
+ goto out;
+ }
+
+ *objectid = ++root->highest_objectid;
+ ret = 0;
+out:
+ mutex_unlock(&root->objectid_mutex);
+ return ret;
+}
--
Gitblit v1.6.2