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ocfs2: Define data structures for discontiguous block groups.

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Defines the OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG feature bit and modifies
struct ocfs2_group_desc for the feature.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
This commit is contained in:
Joel Becker 2010-04-13 14:26:12 +08:00 committed by Tao Ma
parent 0467ae954d
commit 4cbe4249d6
5 changed files with 51 additions and 12 deletions
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2
fs/ocfs2/localalloc.c
View File

@ -122,7 +122,7 @@ unsigned int ocfs2_la_default_mb(struct ocfs2_super *osb)
struct super_block *sb = osb->sb;
gd_mb = ocfs2_clusters_to_megabytes(osb->sb,
8 * ocfs2_group_bitmap_size(sb));
8 * ocfs2_group_bitmap_size(sb, 0));
/*
* This takes care of files systems with very small group

53
fs/ocfs2/ocfs2_fs.h
View File

@ -165,6 +165,9 @@
/* Refcount tree support */
#define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE 0x1000
/* Discontigous block groups */
#define OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG 0x2000
/*
* backup superblock flag is used to indicate that this volume
* has backup superblocks.
@ -831,6 +834,13 @@ struct ocfs2_dx_leaf {
struct ocfs2_dx_entry_list dl_list;
};
/*
* Largest bitmap for a block (suballocator) group in bytes. This limit
* does not affect cluster groups (global allocator). Cluster group
* bitmaps run to the end of the block.
*/
#define OCFS2_MAX_BG_BITMAP_SIZE 256
/*
* On disk allocator group structure for OCFS2
*/
@ -852,7 +862,29 @@ struct ocfs2_group_desc
__le64 bg_blkno; /* Offset on disk, in blocks */
/*30*/ struct ocfs2_block_check bg_check; /* Error checking */
__le64 bg_reserved2;
/*40*/ __u8 bg_bitmap[0];
/*40*/ union {
__u8 bg_bitmap[0];
struct {
/*
* Block groups may be discontiguous when
* OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG is set.
* The extents of a discontigous block group are
* stored in bg_list. It is a flat list.
* l_tree_depth must always be zero. A
* discontiguous group is signified by a non-zero
* bg_list->l_next_free_rec. Only block groups
* can be discontiguous; Cluster groups cannot.
* We've never made a block group with more than
* 2048 blocks (256 bytes of bg_bitmap). This
* codifies that limit so that we can fit bg_list.
* bg_size of a discontiguous block group will
* be 256 to match bg_bitmap_filler.
*/
__u8 bg_bitmap_filler[OCFS2_MAX_BG_BITMAP_SIZE];
/*140*/ struct ocfs2_extent_list bg_list;
};
};
/* Actual on-disk size is one block */
};
struct ocfs2_refcount_rec {
@ -1276,12 +1308,16 @@ static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
return size;
}
static inline int ocfs2_group_bitmap_size(struct super_block *sb)
static inline int ocfs2_group_bitmap_size(struct super_block *sb,
int suballocator)
{
int size;
size = sb->s_blocksize -
offsetof(struct ocfs2_group_desc, bg_bitmap);
if (suballocator)
size = OCFS2_MAX_BG_BITMAP_SIZE;
else
size = sb->s_blocksize -
offsetof(struct ocfs2_group_desc, bg_bitmap);
return size;
}
@ -1404,12 +1440,15 @@ static inline int ocfs2_local_alloc_size(int blocksize)
return size;
}
static inline int ocfs2_group_bitmap_size(int blocksize)
static inline int ocfs2_group_bitmap_size(int blocksize, int suballocator)
{
int size;
size = blocksize -
offsetof(struct ocfs2_group_desc, bg_bitmap);
if (suballocator)
size = OCFS2_MAX_BG_BITMAP_SIZE;
else
size = blocksize -
offsetof(struct ocfs2_group_desc, bg_bitmap);
return size;
}

4
fs/ocfs2/resize.c
View File

@ -315,7 +315,7 @@ int ocfs2_group_extend(struct inode * inode, int new_clusters)
BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
ocfs2_group_bitmap_size(osb->sb) * 8) {
ocfs2_group_bitmap_size(osb->sb, 0) * 8) {
mlog(ML_ERROR, "The disk is too old and small. "
"Force to do offline resize.");
ret = -EINVAL;
@ -496,7 +496,7 @@ int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
ocfs2_group_bitmap_size(osb->sb) * 8) {
ocfs2_group_bitmap_size(osb->sb, 0) * 8) {
mlog(ML_ERROR, "The disk is too old and small."
" Force to do offline resize.");
ret = -EINVAL;

2
fs/ocfs2/suballoc.c
View File

@ -360,7 +360,7 @@ static int ocfs2_block_group_fill(handle_t *handle,
memset(bg, 0, sb->s_blocksize);
strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE);
bg->bg_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb));
bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb, 1));
bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
bg->bg_chain = cpu_to_le16(my_chain);
bg->bg_next_group = cl->cl_recs[my_chain].c_blkno;

2
fs/ocfs2/super.c
View File

@ -2277,7 +2277,7 @@ static int ocfs2_initialize_super(struct super_block *sb,
osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
iput(inode);
osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0) * 8;
status = ocfs2_init_slot_info(osb);
if (status < 0) {