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ocfs2: btree changes for unwritten extents 

Writes to a region marked as unwritten might result in a record split or
merge. We can support splits by making minor changes to the existing insert
code. Merges require left rotations which mostly re-use right rotation
support functions.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Mark Fasheh 2007-06-18 10:48:04 -07:00
parent c3afcbb344
commit 328d5752e1
6 changed files with 1770 additions and 91 deletions
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1799
fs/ocfs2/alloc.c
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File diff suppressed because it is too large Load Diff

6
fs/ocfs2/alloc.h
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@ -35,6 +35,11 @@ int ocfs2_insert_extent(struct ocfs2_super *osb,
u64 start_blk,
u32 new_clusters,
struct ocfs2_alloc_context *meta_ac);
struct ocfs2_cached_dealloc_ctxt;
int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *di_bh,
handle_t *handle, u32 cpos, u32 len, u32 phys,
struct ocfs2_alloc_context *meta_ac,
struct ocfs2_cached_dealloc_ctxt *dealloc);
int ocfs2_num_free_extents(struct ocfs2_super *osb,
struct inode *inode,
struct ocfs2_dinode *fe);
@ -102,6 +107,7 @@ int ocfs2_commit_truncate(struct ocfs2_super *osb,
int ocfs2_find_leaf(struct inode *inode, struct ocfs2_extent_list *root_el,
u32 cpos, struct buffer_head **leaf_bh);
int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster);
/*
* Helper function to look at the # of clusters in an extent record.

5
fs/ocfs2/endian.h
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@ -32,6 +32,11 @@ static inline void le32_add_cpu(__le32 *var, u32 val)
*var = cpu_to_le32(le32_to_cpu(*var) + val);
}
static inline void le64_add_cpu(__le64 *var, u64 val)
{
*var = cpu_to_le64(le64_to_cpu(*var) + val);
}
static inline void le32_and_cpu(__le32 *var, u32 val)
{
*var = cpu_to_le32(le32_to_cpu(*var) & val);

31
fs/ocfs2/extent_map.c
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@ -373,37 +373,6 @@ out:
return ret;
}
/*
* Return the index of the extent record which contains cluster #v_cluster.
* -1 is returned if it was not found.
*
* Should work fine on interior and exterior nodes.
*/
static int ocfs2_search_extent_list(struct ocfs2_extent_list *el,
u32 v_cluster)
{
int ret = -1;
int i;
struct ocfs2_extent_rec *rec;
u32 rec_end, rec_start, clusters;
for(i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
rec = &el->l_recs[i];
rec_start = le32_to_cpu(rec->e_cpos);
clusters = ocfs2_rec_clusters(el, rec);
rec_end = rec_start + clusters;
if (v_cluster >= rec_start && v_cluster < rec_end) {
ret = i;
break;
}
}
return ret;
}
int ocfs2_get_clusters(struct inode *inode, u32 v_cluster,
u32 *p_cluster, u32 *num_clusters,
unsigned int *extent_flags)

13
fs/ocfs2/ocfs2.h
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@ -306,6 +306,19 @@ static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
return 0;
}
static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
{
/*
* Support for sparse files is a pre-requisite
*/
if (!ocfs2_sparse_alloc(osb))
return 0;
if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
return 1;
return 0;
}
/* set / clear functions because cluster events can make these happen
* in parallel so we want the transitions to be atomic. this also
* means that any future flags osb_flags must be protected by spinlock

7
fs/ocfs2/ocfs2_fs.h
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@ -88,7 +88,7 @@
#define OCFS2_FEATURE_COMPAT_SUPP OCFS2_FEATURE_COMPAT_BACKUP_SB
#define OCFS2_FEATURE_INCOMPAT_SUPP (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
| OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
#define OCFS2_FEATURE_RO_COMPAT_SUPP 0
#define OCFS2_FEATURE_RO_COMPAT_SUPP OCFS2_FEATURE_RO_COMPAT_UNWRITTEN
/*
* Heartbeat-only devices are missing journals and other files. The
@ -116,6 +116,11 @@
*/
#define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001
/*
* Unwritten extents support.
*/
#define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001
/* The byte offset of the first backup block will be 1G.
* The following will be 4G, 16G, 64G, 256G and 1T.
*/