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btrfs-progs: check: introduce function to check file extent 

Introduce a new function check_file_extent() to check file extent,
such as datasum, hole, size.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Lu Fengqi 2016-07-26 10:03:01 +08:00 committed by David Sterba
parent 52bfe9ef78
commit d88da10ddd
1 changed files with 97 additions and 0 deletions
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97
cmds-check.c
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@ -3833,6 +3833,9 @@ out:
#define INODE_REF_MISSING (1<<4) /* INODE_REF/INODE_EXTREF not found */
#define INODE_ITEM_MISSING (1<<5) /* INODE_ITEM not found */
#define INODE_ITEM_MISMATCH (1<<6) /* INODE_ITEM found but not match */
#define FILE_EXTENT_ERROR (1<<7) /* bad FILE_EXTENT */
#define ODD_CSUM_ITEM (1<<8) /* CSUM_ITEM error */
#define CSUM_ITEM_MISSING (1<<9) /* CSUM_ITEM not found */
/*
* Find DIR_ITEM/DIR_INDEX for the given key and check it with the specified
@ -4393,6 +4396,100 @@ next:
return err;
}
/*
* Check file extent datasum/hole, update the size of the file extents,
* check and update the last offset of the file extent.
*
* @root: the root of fs/file tree.
* @fkey: the key of the file extent.
* @nodatasum: INODE_NODATASUM feature.
* @size: the sum of all EXTENT_DATA items size for this inode.
* @end: the offset of the last extent.
*
* Return 0 if no error occurred.
*/
static int check_file_extent(struct btrfs_root *root, struct btrfs_key *fkey,
struct extent_buffer *node, int slot,
unsigned int nodatasum, u64 *size, u64 *end)
{
struct btrfs_file_extent_item *fi;
u64 disk_bytenr;
u64 disk_num_bytes;
u64 extent_num_bytes;
u64 found;
unsigned int extent_type;
unsigned int is_hole;
int ret;
int err = 0;
fi = btrfs_item_ptr(node, slot, struct btrfs_file_extent_item);
extent_type = btrfs_file_extent_type(node, fi);
/* Skip if file extent is inline */
if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
struct btrfs_item *e = btrfs_item_nr(slot);
u32 item_inline_len;
item_inline_len = btrfs_file_extent_inline_item_len(node, e);
extent_num_bytes = btrfs_file_extent_inline_len(node, slot, fi);
if (extent_num_bytes == 0 ||
extent_num_bytes != item_inline_len)
err |= FILE_EXTENT_ERROR;
*size += extent_num_bytes;
return err;
}
/* Check extent type */
if (extent_type != BTRFS_FILE_EXTENT_REG &&
extent_type != BTRFS_FILE_EXTENT_PREALLOC) {
err |= FILE_EXTENT_ERROR;
error("root %llu EXTENT_DATA[%llu %llu] type bad",
root->objectid, fkey->objectid, fkey->offset);
return err;
}
/* Check REG_EXTENT/PREALLOC_EXTENT */
disk_bytenr = btrfs_file_extent_disk_bytenr(node, fi);
disk_num_bytes = btrfs_file_extent_disk_num_bytes(node, fi);
extent_num_bytes = btrfs_file_extent_num_bytes(node, fi);
is_hole = (disk_bytenr == 0) && (disk_num_bytes == 0);
/* Check EXTENT_DATA datasum */
ret = count_csum_range(root, disk_bytenr, disk_num_bytes, &found);
if (found > 0 && nodatasum) {
err |= ODD_CSUM_ITEM;
error("root %llu EXTENT_DATA[%llu %llu] nodatasum shouldn't have datasum",
root->objectid, fkey->objectid, fkey->offset);
} else if (extent_type == BTRFS_FILE_EXTENT_REG && !nodatasum &&
!is_hole &&
(ret < 0 || found == 0 || found < disk_num_bytes)) {
err |= CSUM_ITEM_MISSING;
error("root %llu EXTENT_DATA[%llu %llu] datasum missing",
root->objectid, fkey->objectid, fkey->offset);
} else if (extent_type == BTRFS_FILE_EXTENT_PREALLOC && found > 0) {
err |= ODD_CSUM_ITEM;
error("root %llu EXTENT_DATA[%llu %llu] prealloc shouldn't have datasum",
root->objectid, fkey->objectid, fkey->offset);
}
/* Check EXTENT_DATA hole */
if (no_holes && is_hole) {
err |= FILE_EXTENT_ERROR;
error("root %llu EXTENT_DATA[%llu %llu] shouldn't be hole",
root->objectid, fkey->objectid, fkey->offset);
} else if (!no_holes && *end != fkey->offset) {
err |= FILE_EXTENT_ERROR;
error("root %llu EXTENT_DATA[%llu %llu] interrupt",
root->objectid, fkey->objectid, fkey->offset);
}
*end += extent_num_bytes;
if (!is_hole)
*size += extent_num_bytes;
return err;
}
static int all_backpointers_checked(struct extent_record *rec, int print_errs)
{
struct list_head *cur = rec->backrefs.next;