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ocfs2: Make ocfs2_extent_tree the first-class representation of a tree.

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We now have three different kinds of extent trees in ocfs2: inode data
(dinode), extended attributes (xattr_tree), and extended attribute
values (xattr_value).  There is a nice abstraction for them,
ocfs2_extent_tree, but it is hidden in alloc.c.  All the calling
functions have to pick amongst a varied API and pass in type bits and
often extraneous pointers.

A better way is to make ocfs2_extent_tree a first-class object.
Everyone converts their object to an ocfs2_extent_tree() via the
ocfs2_get_*_extent_tree() calls, then uses the ocfs2_extent_tree for all
tree calls to alloc.c.

This simplifies a lot of callers, making for readability.  It also
provides an easy way to add additional extent tree types, as they only
need to be defined in alloc.c with a ocfs2_get_<new>_extent_tree()
function.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Joel Becker
2008-08-20 19:36:33 -07:00
committed by Mark Fasheh
parent 1e61ee79e2
commit f99b9b7ccf
8 changed files with 240 additions and 332 deletions
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71
fs/ocfs2/xattr.c
View File

@@ -206,22 +206,24 @@ static int ocfs2_xattr_extend_allocation(struct inode *inode,
struct ocfs2_alloc_context *meta_ac = NULL;
enum ocfs2_alloc_restarted why;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_extent_list *root_el = &xv->xr_list;
u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
struct ocfs2_extent_tree et;
mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
ocfs2_get_xattr_value_extent_tree(&et, inode, xattr_bh, xv);
restart_all:
status = ocfs2_lock_allocators(inode, xattr_bh, root_el,
clusters_to_add, 0, &data_ac,
&meta_ac, OCFS2_XATTR_VALUE_EXTENT, xv);
status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
&data_ac, &meta_ac);
if (status) {
mlog_errno(status);
goto leave;
}
credits = ocfs2_calc_extend_credits(osb->sb, root_el, clusters_to_add);
credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
clusters_to_add);
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
@@ -244,14 +246,11 @@ restarted_transaction:
&logical_start,
clusters_to_add,
0,
xattr_bh,
root_el,
&et,
handle,
data_ac,
meta_ac,
&why,
OCFS2_XATTR_VALUE_EXTENT,
xv);
&why);
if ((status < 0) && (status != -EAGAIN)) {
if (status != -ENOSPC)
mlog_errno(status);
@@ -276,7 +275,7 @@ restarted_transaction:
mlog(0, "restarting transaction.\n");
/* TODO: This can be more intelligent. */
credits = ocfs2_calc_extend_credits(osb->sb,
root_el,
et.et_root_el,
clusters_to_add);
status = ocfs2_extend_trans(handle, credits);
if (status < 0) {
@@ -308,6 +307,7 @@ leave:
goto restart_all;
}
ocfs2_put_extent_tree(&et);
return status;
}
@@ -323,11 +323,13 @@ static int __ocfs2_remove_xattr_range(struct inode *inode,
struct inode *tl_inode = osb->osb_tl_inode;
handle_t *handle;
struct ocfs2_alloc_context *meta_ac = NULL;
struct ocfs2_extent_tree et;
ret = ocfs2_lock_allocators(inode, root_bh, &xv->xr_list,
0, 1, NULL, &meta_ac,
OCFS2_XATTR_VALUE_EXTENT, xv);
ocfs2_get_xattr_value_extent_tree(&et, inode, root_bh, xv);
ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
if (ret) {
ocfs2_put_extent_tree(&et);
mlog_errno(ret);
return ret;
}
@@ -356,8 +358,8 @@ static int __ocfs2_remove_xattr_range(struct inode *inode,
goto out_commit;
}
ret = ocfs2_remove_extent(inode, root_bh, cpos, len, handle, meta_ac,
dealloc, OCFS2_XATTR_VALUE_EXTENT, xv);
ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
dealloc);
if (ret) {
mlog_errno(ret);
goto out_commit;
@@ -383,6 +385,7 @@ out:
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
ocfs2_put_extent_tree(&et);
return ret;
}
@@ -3622,26 +3625,24 @@ static int ocfs2_add_new_xattr_cluster(struct inode *inode,
struct ocfs2_alloc_context *data_ac = NULL;
struct ocfs2_alloc_context *meta_ac = NULL;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_xattr_block *xb =
(struct ocfs2_xattr_block *)root_bh->b_data;
struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
struct ocfs2_extent_list *root_el = &xb_root->xt_list;
enum ocfs2_extent_tree_type type = OCFS2_XATTR_TREE_EXTENT;
struct ocfs2_extent_tree et;
mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
"previous xattr blkno = %llu\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
prev_cpos, prev_blkno);
ret = ocfs2_lock_allocators(inode, root_bh, root_el,
clusters_to_add, 0, &data_ac,
&meta_ac, type, NULL);
ocfs2_get_xattr_tree_extent_tree(&et, inode, root_bh);
ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
&data_ac, &meta_ac);
if (ret) {
mlog_errno(ret);
goto leave;
}
credits = ocfs2_calc_extend_credits(osb->sb, root_el, clusters_to_add);
credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
clusters_to_add);
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
@@ -3705,9 +3706,8 @@ static int ocfs2_add_new_xattr_cluster(struct inode *inode,
mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
num_bits, block, v_start);
ret = ocfs2_xattr_tree_insert_extent(osb, handle, inode, root_bh,
v_start, block, num_bits,
0, meta_ac);
ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
num_bits, 0, meta_ac);
if (ret < 0) {
mlog_errno(ret);
goto leave;
@@ -3727,6 +3727,7 @@ leave:
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
ocfs2_put_extent_tree(&et);
return ret;
}
@@ -4331,9 +4332,11 @@ static int ocfs2_rm_xattr_cluster(struct inode *inode,
handle_t *handle;
struct ocfs2_xattr_block *xb =
(struct ocfs2_xattr_block *)root_bh->b_data;
struct ocfs2_extent_list *root_el = &xb->xb_attrs.xb_root.xt_list;
struct ocfs2_alloc_context *meta_ac = NULL;
struct ocfs2_cached_dealloc_ctxt dealloc;
struct ocfs2_extent_tree et;
ocfs2_get_xattr_tree_extent_tree(&et, inode, root_bh);
ocfs2_init_dealloc_ctxt(&dealloc);
@@ -4342,10 +4345,9 @@ static int ocfs2_rm_xattr_cluster(struct inode *inode,
ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
ret = ocfs2_lock_allocators(inode, root_bh, root_el,
0, 1, NULL, &meta_ac,
OCFS2_XATTR_TREE_EXTENT, NULL);
ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
if (ret) {
ocfs2_put_extent_tree(&et);
mlog_errno(ret);
return ret;
}
@@ -4374,8 +4376,8 @@ static int ocfs2_rm_xattr_cluster(struct inode *inode,
goto out_commit;
}
ret = ocfs2_remove_extent(inode, root_bh, cpos, len, handle, meta_ac,
&dealloc, OCFS2_XATTR_TREE_EXTENT, NULL);
ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
&dealloc);
if (ret) {
mlog_errno(ret);
goto out_commit;
@@ -4405,6 +4407,7 @@ out:
ocfs2_run_deallocs(osb, &dealloc);
ocfs2_put_extent_tree(&et);
return ret;
}