xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Btrfs: Handle data checksumming on bios that span multiple ordered extents

Browse Source 
Data checksumming is done right before the bio is sent down the IO stack,
which means a single bio might span more than one ordered extent.  In
this case, the checksumming data is split between two ordered extents.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-07-18 06:17:13 -04:00
parent eb84ae039e
commit 3edf7d33f4
5 changed files with 69 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
fs/btrfs/ordered-data.h
View File

@@ -39,7 +39,11 @@ struct btrfs_sector_sum {
struct btrfs_ordered_sum {
u64 file_offset;
u64 len;
/*
* this is the length in bytes covered by the sums array below.
* But, the sums array may not be contiguous in the file.
*/
unsigned long len;
struct list_head list;
/* last field is a variable length array of btrfs_sector_sums */
struct btrfs_sector_sum sums;
@@ -95,6 +99,7 @@ static inline int btrfs_ordered_sum_size(struct btrfs_root *root, u64 bytes)
{
unsigned long num_sectors = (bytes + root->sectorsize - 1) /
root->sectorsize;
num_sectors++;
return sizeof(struct btrfs_ordered_sum) +
num_sectors * sizeof(struct btrfs_sector_sum);
}
@@ -114,7 +119,9 @@ int btrfs_dec_test_ordered_pending(struct inode *inode,
u64 file_offset, u64 io_size);
int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
u64 start, u64 len);
int btrfs_add_ordered_sum(struct inode *inode, struct btrfs_ordered_sum *sum);
int btrfs_add_ordered_sum(struct inode *inode,
struct btrfs_ordered_extent *entry,
struct btrfs_ordered_sum *sum);
struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
u64 file_offset);
void btrfs_start_ordered_extent(struct inode *inode,