Qu Wenruo
2013-Dec-24 03:49 UTC
[PATCH] btrfs: Move some super block check to btrfs_check_super_valid
Move some early check to btrfs_check_super_valid:
- sectorsize check
- leafsize == nodesize check
- leafsize > BTRFS_MAX_METADATA_BLOCKSIZE check
- incompat_flags check
and remove the duplicant magic check of btrfs_super_block,
since btrfs_read_dev_super already checked the magic number.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
---
fs/btrfs/disk-io.c | 76 ++++++++++++++++++++++++------------------------------
1 file changed, 34 insertions(+), 42 deletions(-)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 8072cfa..04ad1d3 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2388,33 +2388,6 @@ int open_ctree(struct super_block *sb,
goto fail_alloc;
}
- features = btrfs_super_incompat_flags(disk_super) &
- ~BTRFS_FEATURE_INCOMPAT_SUPP;
- if (features) {
- printk(KERN_ERR "BTRFS: couldn't mount because of "
- "unsupported optional features (%Lx).\n",
- features);
- err = -EINVAL;
- goto fail_alloc;
- }
-
- if (btrfs_super_leafsize(disk_super) !- btrfs_super_nodesize(disk_super))
{
- printk(KERN_ERR "BTRFS: couldn't mount because metadata "
- "blocksizes don't match. node %d leaf %d\n",
- btrfs_super_nodesize(disk_super),
- btrfs_super_leafsize(disk_super));
- err = -EINVAL;
- goto fail_alloc;
- }
- if (btrfs_super_leafsize(disk_super) > BTRFS_MAX_METADATA_BLOCKSIZE) {
- printk(KERN_ERR "BTRFS: couldn't mount because metadata "
- "blocksize (%d) was too large\n",
- btrfs_super_leafsize(disk_super));
- err = -EINVAL;
- goto fail_alloc;
- }
-
features = btrfs_super_incompat_flags(disk_super);
features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
if (tree_root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
@@ -2582,17 +2555,6 @@ int open_ctree(struct super_block *sb,
sb->s_blocksize = sectorsize;
sb->s_blocksize_bits = blksize_bits(sectorsize);
- if (btrfs_super_magic(disk_super) != BTRFS_MAGIC) {
- printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id);
- goto fail_sb_buffer;
- }
-
- if (sectorsize != PAGE_SIZE) {
- printk(KERN_WARNING "btrfs: Incompatible sector size(%lu) "
- "found on %s\n", (unsigned long)sectorsize, sb->s_id);
- goto fail_sb_buffer;
- }
-
mutex_lock(&fs_info->chunk_mutex);
ret = btrfs_read_sys_array(tree_root);
mutex_unlock(&fs_info->chunk_mutex);
@@ -3706,11 +3668,41 @@ int btrfs_read_buffer(struct extent_buffer *buf, u64
parent_transid)
}
static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
- int read_only)
+ int read_only)
{
- /*
- * Placeholder for checks
- */
+ struct btrfs_super_block *disk_super = fs_info->super_copy;
+ u32 sectorsize = btrfs_super_sectorsize(disk_super);
+ u64 features;
+
+ if (sectorsize != PAGE_SIZE) {
+ printk(KERN_WARNING "btrfs: Incompatible sector size(%lu) "
+ "found on %s\n", (unsigned long)sectorsize,
+ fs_info->sb->s_id);
+ return -EINVAL;
+ }
+ if (btrfs_super_leafsize(disk_super) !+ btrfs_super_nodesize(disk_super))
{
+ printk(KERN_ERR "BTRFS: couldn't mount because metadata "
+ "blocksizes don't match. node %d leaf %d\n",
+ btrfs_super_nodesize(disk_super),
+ btrfs_super_leafsize(disk_super));
+ return -EINVAL;
+ }
+ if (btrfs_super_leafsize(disk_super) > BTRFS_MAX_METADATA_BLOCKSIZE) {
+ printk(KERN_ERR "BTRFS: couldn't mount because metadata "
+ "blocksize (%d) was too large\n",
+ btrfs_super_leafsize(disk_super));
+ return -EINVAL;
+ }
+
+ features = btrfs_super_incompat_flags(disk_super) &
+ ~BTRFS_FEATURE_INCOMPAT_SUPP;
+ if (features) {
+ printk(KERN_ERR "BTRFS: couldn't mount because of "
+ "unsupported optional features (%Lx).\n",
+ features);
+ return -EINVAL;
+ }
return 0;
}
--
1.8.5.2
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