ocfs2: Make ocfs2_extent_tree the first-class representation of a tree.
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>
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index ce54730..786a829 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -49,20 +49,6 @@
#include "buffer_head_io.h"
-/*
- * ocfs2_extent_tree and ocfs2_extent_tree_operations are used to abstract
- * the b-tree operations in ocfs2. Now all the b-tree operations are not
- * limited to ocfs2_dinode only. Any data which need to allocate clusters
- * to store can use b-tree. And it only needs to implement its ocfs2_extent_tree
- * and operation.
- *
- * ocfs2_extent_tree contains info for the root of the b-tree, it must have a
- * root ocfs2_extent_list and a root_bh so that they can be used in the b-tree
- * functions.
- * ocfs2_extent_tree_operations abstract the normal operations we do for
- * the root of extent b-tree.
- */
-struct ocfs2_extent_tree;
struct ocfs2_extent_tree_operations {
void (*eo_set_last_eb_blk)(struct ocfs2_extent_tree *et,
@@ -83,28 +69,38 @@
struct ocfs2_extent_tree *et);
};
-struct ocfs2_extent_tree {
- enum ocfs2_extent_tree_type et_type;
- struct ocfs2_extent_tree_operations *et_ops;
- struct buffer_head *et_root_bh;
- struct ocfs2_extent_list *et_root_el;
- void *et_object;
- unsigned int et_max_leaf_clusters;
+
+/*
+ * Pre-declare ocfs2_dinode_et_ops so we can use it as a sanity check
+ * in the methods.
+ */
+static u64 ocfs2_dinode_get_last_eb_blk(struct ocfs2_extent_tree *et);
+static void ocfs2_dinode_set_last_eb_blk(struct ocfs2_extent_tree *et,
+ u64 blkno);
+static void ocfs2_dinode_update_clusters(struct inode *inode,
+ struct ocfs2_extent_tree *et,
+ u32 clusters);
+static int ocfs2_dinode_insert_check(struct inode *inode,
+ struct ocfs2_extent_tree *et,
+ struct ocfs2_extent_rec *rec);
+static int ocfs2_dinode_sanity_check(struct inode *inode,
+ struct ocfs2_extent_tree *et);
+static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et);
+static struct ocfs2_extent_tree_operations ocfs2_dinode_et_ops = {
+ .eo_set_last_eb_blk = ocfs2_dinode_set_last_eb_blk,
+ .eo_get_last_eb_blk = ocfs2_dinode_get_last_eb_blk,
+ .eo_update_clusters = ocfs2_dinode_update_clusters,
+ .eo_insert_check = ocfs2_dinode_insert_check,
+ .eo_sanity_check = ocfs2_dinode_sanity_check,
+ .eo_fill_root_el = ocfs2_dinode_fill_root_el,
};
-static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et)
-{
- struct ocfs2_dinode *di = et->et_object;
-
- et->et_root_el = &di->id2.i_list;
-}
-
static void ocfs2_dinode_set_last_eb_blk(struct ocfs2_extent_tree *et,
u64 blkno)
{
struct ocfs2_dinode *di = et->et_object;
- BUG_ON(et->et_type != OCFS2_DINODE_EXTENT);
+ BUG_ON(et->et_ops != &ocfs2_dinode_et_ops);
di->i_last_eb_blk = cpu_to_le64(blkno);
}
@@ -112,7 +108,7 @@
{
struct ocfs2_dinode *di = et->et_object;
- BUG_ON(et->et_type != OCFS2_DINODE_EXTENT);
+ BUG_ON(et->et_ops != &ocfs2_dinode_et_ops);
return le64_to_cpu(di->i_last_eb_blk);
}
@@ -153,7 +149,7 @@
int ret = 0;
struct ocfs2_dinode *di;
- BUG_ON(et->et_type != OCFS2_DINODE_EXTENT);
+ BUG_ON(et->et_ops != &ocfs2_dinode_et_ops);
di = et->et_object;
if (!OCFS2_IS_VALID_DINODE(di)) {
@@ -166,14 +162,13 @@
return ret;
}
-static struct ocfs2_extent_tree_operations ocfs2_dinode_et_ops = {
- .eo_set_last_eb_blk = ocfs2_dinode_set_last_eb_blk,
- .eo_get_last_eb_blk = ocfs2_dinode_get_last_eb_blk,
- .eo_update_clusters = ocfs2_dinode_update_clusters,
- .eo_insert_check = ocfs2_dinode_insert_check,
- .eo_sanity_check = ocfs2_dinode_sanity_check,
- .eo_fill_root_el = ocfs2_dinode_fill_root_el,
-};
+static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et)
+{
+ struct ocfs2_dinode *di = et->et_object;
+
+ et->et_root_el = &di->id2.i_list;
+}
+
static void ocfs2_xattr_value_fill_root_el(struct ocfs2_extent_tree *et)
{
@@ -269,10 +264,8 @@
struct inode *inode,
struct buffer_head *bh,
void *obj,
- enum ocfs2_extent_tree_type et_type,
struct ocfs2_extent_tree_operations *ops)
{
- et->et_type = et_type;
et->et_ops = ops;
get_bh(bh);
et->et_root_bh = bh;
@@ -287,50 +280,31 @@
et->et_ops->eo_fill_max_leaf_clusters(inode, et);
}
-static void ocfs2_get_dinode_extent_tree(struct ocfs2_extent_tree *et,
- struct inode *inode,
- struct buffer_head *bh)
+void ocfs2_get_dinode_extent_tree(struct ocfs2_extent_tree *et,
+ struct inode *inode,
+ struct buffer_head *bh)
{
- __ocfs2_get_extent_tree(et, inode, bh, NULL, OCFS2_DINODE_EXTENT,
- &ocfs2_dinode_et_ops);
+ __ocfs2_get_extent_tree(et, inode, bh, NULL, &ocfs2_dinode_et_ops);
}
-static void ocfs2_get_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
- struct inode *inode,
- struct buffer_head *bh)
+void ocfs2_get_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
+ struct inode *inode,
+ struct buffer_head *bh)
{
__ocfs2_get_extent_tree(et, inode, bh, NULL,
- OCFS2_XATTR_TREE_EXTENT,
&ocfs2_xattr_tree_et_ops);
}
-static void ocfs2_get_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
- struct inode *inode,
- struct buffer_head *bh,
- struct ocfs2_xattr_value_root *xv)
+void ocfs2_get_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
+ struct inode *inode,
+ struct buffer_head *bh,
+ struct ocfs2_xattr_value_root *xv)
{
__ocfs2_get_extent_tree(et, inode, bh, xv,
- OCFS2_XATTR_VALUE_EXTENT,
&ocfs2_xattr_value_et_ops);
}
-static void ocfs2_get_extent_tree(struct ocfs2_extent_tree *et,
- struct inode *inode,
- struct buffer_head *bh,
- enum ocfs2_extent_tree_type et_type,
- void *obj)
-{
- if (et_type == OCFS2_DINODE_EXTENT)
- ocfs2_get_dinode_extent_tree(et, inode, bh);
- else if (et_type == OCFS2_XATTR_VALUE_EXTENT)
- ocfs2_get_xattr_tree_extent_tree(et, inode, bh);
- else if (et_type == OCFS2_XATTR_TREE_EXTENT)
- ocfs2_get_xattr_value_extent_tree(et, inode, bh, obj);
- else
- BUG();
-}
-
-static void ocfs2_put_extent_tree(struct ocfs2_extent_tree *et)
+void ocfs2_put_extent_tree(struct ocfs2_extent_tree *et)
{
brelse(et->et_root_bh);
}
@@ -682,22 +656,18 @@
*/
int ocfs2_num_free_extents(struct ocfs2_super *osb,
struct inode *inode,
- struct buffer_head *root_bh,
- enum ocfs2_extent_tree_type type,
- void *obj)
+ struct ocfs2_extent_tree *et)
{
int retval;
struct ocfs2_extent_list *el = NULL;
struct ocfs2_extent_block *eb;
struct buffer_head *eb_bh = NULL;
u64 last_eb_blk = 0;
- struct ocfs2_extent_tree et;
mlog_entry_void();
- ocfs2_get_extent_tree(&et, inode, root_bh, type, obj);
- el = et.et_root_el;
- last_eb_blk = ocfs2_et_get_last_eb_blk(&et);
+ el = et->et_root_el;
+ last_eb_blk = ocfs2_et_get_last_eb_blk(et);
if (last_eb_blk) {
retval = ocfs2_read_block(osb, last_eb_blk,
@@ -717,7 +687,6 @@
if (eb_bh)
brelse(eb_bh);
- ocfs2_put_extent_tree(&et);
mlog_exit(retval);
return retval;
}
@@ -4406,16 +4375,15 @@
*
* The caller needs to update fe->i_clusters
*/
-static int ocfs2_insert_extent(struct ocfs2_super *osb,
- handle_t *handle,
- struct inode *inode,
- struct buffer_head *root_bh,
- u32 cpos,
- u64 start_blk,
- u32 new_clusters,
- u8 flags,
- struct ocfs2_alloc_context *meta_ac,
- struct ocfs2_extent_tree *et)
+int ocfs2_insert_extent(struct ocfs2_super *osb,
+ handle_t *handle,
+ struct inode *inode,
+ struct ocfs2_extent_tree *et,
+ u32 cpos,
+ u64 start_blk,
+ u32 new_clusters,
+ u8 flags,
+ struct ocfs2_alloc_context *meta_ac)
{
int status;
int uninitialized_var(free_records);
@@ -4464,7 +4432,7 @@
status = ocfs2_do_insert_extent(inode, handle, et, &rec, &insert);
if (status < 0)
mlog_errno(status);
- else if (et->et_type == OCFS2_DINODE_EXTENT)
+ else if (et->et_ops == &ocfs2_dinode_et_ops)
ocfs2_extent_map_insert_rec(inode, &rec);
bail:
@@ -4475,77 +4443,10 @@
return status;
}
-int ocfs2_dinode_insert_extent(struct ocfs2_super *osb,
- handle_t *handle,
- struct inode *inode,
- struct buffer_head *root_bh,
- u32 cpos,
- u64 start_blk,
- u32 new_clusters,
- u8 flags,
- struct ocfs2_alloc_context *meta_ac)
-{
- int status;
- struct ocfs2_extent_tree et;
-
- ocfs2_get_dinode_extent_tree(&et, inode, root_bh);
- status = ocfs2_insert_extent(osb, handle, inode, root_bh,
- cpos, start_blk, new_clusters,
- flags, meta_ac, &et);
- ocfs2_put_extent_tree(&et);
-
- return status;
-}
-
-int ocfs2_xattr_value_insert_extent(struct ocfs2_super *osb,
- handle_t *handle,
- struct inode *inode,
- struct buffer_head *root_bh,
- u32 cpos,
- u64 start_blk,
- u32 new_clusters,
- u8 flags,
- struct ocfs2_alloc_context *meta_ac,
- struct ocfs2_xattr_value_root *xv)
-{
- int status;
- struct ocfs2_extent_tree et;
-
- ocfs2_get_xattr_value_extent_tree(&et, inode, root_bh, xv);
- status = ocfs2_insert_extent(osb, handle, inode, root_bh,
- cpos, start_blk, new_clusters,
- flags, meta_ac, &et);
- ocfs2_put_extent_tree(&et);
-
- return status;
-}
-
-int ocfs2_xattr_tree_insert_extent(struct ocfs2_super *osb,
- handle_t *handle,
- struct inode *inode,
- struct buffer_head *root_bh,
- u32 cpos,
- u64 start_blk,
- u32 new_clusters,
- u8 flags,
- struct ocfs2_alloc_context *meta_ac)
-{
- int status;
- struct ocfs2_extent_tree et;
-
- ocfs2_get_xattr_tree_extent_tree(&et, inode, root_bh);
- status = ocfs2_insert_extent(osb, handle, inode, root_bh,
- cpos, start_blk, new_clusters,
- flags, meta_ac, &et);
- ocfs2_put_extent_tree(&et);
-
- return status;
-}
-
/*
* Allcate and add clusters into the extent b-tree.
* The new clusters(clusters_to_add) will be inserted at logical_offset.
- * The extent b-tree's root is root_el and it should be in root_bh, and
+ * The extent b-tree's root is specified by et, and
* it is not limited to the file storage. Any extent tree can use this
* function if it implements the proper ocfs2_extent_tree.
*/
@@ -4554,14 +4455,11 @@
u32 *logical_offset,
u32 clusters_to_add,
int mark_unwritten,
- struct buffer_head *root_bh,
- struct ocfs2_extent_list *root_el,
+ struct ocfs2_extent_tree *et,
handle_t *handle,
struct ocfs2_alloc_context *data_ac,
struct ocfs2_alloc_context *meta_ac,
- enum ocfs2_alloc_restarted *reason_ret,
- enum ocfs2_extent_tree_type type,
- void *obj)
+ enum ocfs2_alloc_restarted *reason_ret)
{
int status = 0;
int free_extents;
@@ -4575,8 +4473,7 @@
if (mark_unwritten)
flags = OCFS2_EXT_UNWRITTEN;
- free_extents = ocfs2_num_free_extents(osb, inode, root_bh, type,
- obj);
+ free_extents = ocfs2_num_free_extents(osb, inode, et);
if (free_extents < 0) {
status = free_extents;
mlog_errno(status);
@@ -4595,7 +4492,7 @@
goto leave;
} else if ((!free_extents)
&& (ocfs2_alloc_context_bits_left(meta_ac)
- < ocfs2_extend_meta_needed(root_el))) {
+ < ocfs2_extend_meta_needed(et->et_root_el))) {
mlog(0, "filesystem is really fragmented...\n");
status = -EAGAIN;
reason = RESTART_META;
@@ -4613,7 +4510,7 @@
BUG_ON(num_bits > clusters_to_add);
/* reserve our write early -- insert_extent may update the inode */
- status = ocfs2_journal_access(handle, inode, root_bh,
+ status = ocfs2_journal_access(handle, inode, et->et_root_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
@@ -4623,28 +4520,15 @@
block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
- if (type == OCFS2_DINODE_EXTENT)
- status = ocfs2_dinode_insert_extent(osb, handle, inode, root_bh,
- *logical_offset, block,
- num_bits, flags, meta_ac);
- else if (type == OCFS2_XATTR_TREE_EXTENT)
- status = ocfs2_xattr_tree_insert_extent(osb, handle,
- inode, root_bh,
- *logical_offset,
- block, num_bits, flags,
- meta_ac);
- else
- status = ocfs2_xattr_value_insert_extent(osb, handle,
- inode, root_bh,
- *logical_offset,
- block, num_bits, flags,
- meta_ac, obj);
+ status = ocfs2_insert_extent(osb, handle, inode, et,
+ *logical_offset, block,
+ num_bits, flags, meta_ac);
if (status < 0) {
mlog_errno(status);
goto leave;
}
- status = ocfs2_journal_dirty(handle, root_bh);
+ status = ocfs2_journal_dirty(handle, et->et_root_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
@@ -4915,25 +4799,21 @@
*
* The caller is responsible for passing down meta_ac if we'll need it.
*/
-int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh,
+int ocfs2_mark_extent_written(struct inode *inode,
+ struct ocfs2_extent_tree *et,
handle_t *handle, u32 cpos, u32 len, u32 phys,
struct ocfs2_alloc_context *meta_ac,
- struct ocfs2_cached_dealloc_ctxt *dealloc,
- enum ocfs2_extent_tree_type et_type,
- void *obj)
+ struct ocfs2_cached_dealloc_ctxt *dealloc)
{
int ret, index;
u64 start_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys);
struct ocfs2_extent_rec split_rec;
struct ocfs2_path *left_path = NULL;
struct ocfs2_extent_list *el;
- struct ocfs2_extent_tree et;
mlog(0, "Inode %lu cpos %u, len %u, phys %u (%llu)\n",
inode->i_ino, cpos, len, phys, (unsigned long long)start_blkno);
- ocfs2_get_extent_tree(&et, inode, root_bh, et_type, obj);
-
if (!ocfs2_writes_unwritten_extents(OCFS2_SB(inode->i_sb))) {
ocfs2_error(inode->i_sb, "Inode %llu has unwritten extents "
"that are being written to, but the feature bit "
@@ -4946,11 +4826,14 @@
/*
* XXX: This should be fixed up so that we just re-insert the
* next extent records.
+ *
+ * XXX: This is a hack on the extent tree, maybe it should be
+ * an op?
*/
- if (et_type == OCFS2_DINODE_EXTENT)
+ if (et->et_ops == &ocfs2_dinode_et_ops)
ocfs2_extent_map_trunc(inode, 0);
- left_path = ocfs2_new_path(et.et_root_bh, et.et_root_el);
+ left_path = ocfs2_new_path(et->et_root_bh, et->et_root_el);
if (!left_path) {
ret = -ENOMEM;
mlog_errno(ret);
@@ -4981,7 +4864,7 @@
split_rec.e_flags = path_leaf_el(left_path)->l_recs[index].e_flags;
split_rec.e_flags &= ~OCFS2_EXT_UNWRITTEN;
- ret = __ocfs2_mark_extent_written(inode, &et, handle, left_path,
+ ret = __ocfs2_mark_extent_written(inode, et, handle, left_path,
index, &split_rec, meta_ac,
dealloc);
if (ret)
@@ -4989,7 +4872,6 @@
out:
ocfs2_free_path(left_path);
- ocfs2_put_extent_tree(&et);
return ret;
}
@@ -5219,25 +5101,21 @@
return ret;
}
-int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh,
+int ocfs2_remove_extent(struct inode *inode,
+ struct ocfs2_extent_tree *et,
u32 cpos, u32 len, handle_t *handle,
struct ocfs2_alloc_context *meta_ac,
- struct ocfs2_cached_dealloc_ctxt *dealloc,
- enum ocfs2_extent_tree_type et_type,
- void *obj)
+ struct ocfs2_cached_dealloc_ctxt *dealloc)
{
int ret, index;
u32 rec_range, trunc_range;
struct ocfs2_extent_rec *rec;
struct ocfs2_extent_list *el;
struct ocfs2_path *path = NULL;
- struct ocfs2_extent_tree et;
-
- ocfs2_get_extent_tree(&et, inode, root_bh, et_type, obj);
ocfs2_extent_map_trunc(inode, 0);
- path = ocfs2_new_path(et.et_root_bh, et.et_root_el);
+ path = ocfs2_new_path(et->et_root_bh, et->et_root_el);
if (!path) {
ret = -ENOMEM;
mlog_errno(ret);
@@ -5290,13 +5168,13 @@
if (le32_to_cpu(rec->e_cpos) == cpos || rec_range == trunc_range) {
ret = ocfs2_truncate_rec(inode, handle, path, index, dealloc,
- cpos, len, &et);
+ cpos, len, et);
if (ret) {
mlog_errno(ret);
goto out;
}
} else {
- ret = ocfs2_split_tree(inode, &et, handle, path, index,
+ ret = ocfs2_split_tree(inode, et, handle, path, index,
trunc_range, meta_ac);
if (ret) {
mlog_errno(ret);
@@ -5345,7 +5223,7 @@
}
ret = ocfs2_truncate_rec(inode, handle, path, index, dealloc,
- cpos, len, &et);
+ cpos, len, et);
if (ret) {
mlog_errno(ret);
goto out;
@@ -5354,7 +5232,6 @@
out:
ocfs2_free_path(path);
- ocfs2_put_extent_tree(&et);
return ret;
}
@@ -6773,6 +6650,7 @@
struct ocfs2_alloc_context *data_ac = NULL;
struct page **pages = NULL;
loff_t end = osb->s_clustersize;
+ struct ocfs2_extent_tree et;
has_data = i_size_read(inode) ? 1 : 0;
@@ -6872,8 +6750,10 @@
* this proves to be false, we could always re-build
* the in-inode data from our pages.
*/
- ret = ocfs2_dinode_insert_extent(osb, handle, inode, di_bh,
- 0, block, 1, 0, NULL);
+ ocfs2_get_dinode_extent_tree(&et, inode, di_bh);
+ ret = ocfs2_insert_extent(osb, handle, inode, &et,
+ 0, block, 1, 0, NULL);
+ ocfs2_put_extent_tree(&et);
if (ret) {
mlog_errno(ret);
goto out_commit;