#include "buffer_head_io.h"
-static int ocfs2_extent_contig(struct inode *inode,
- struct ocfs2_extent_rec *ext,
- u64 blkno);
+static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc);
-static int ocfs2_create_new_meta_bhs(struct ocfs2_super *osb,
- handle_t *handle,
- struct inode *inode,
- int wanted,
- struct ocfs2_alloc_context *meta_ac,
- struct buffer_head *bhs[]);
+/*
+ * Structures which describe a path through a btree, and functions to
+ * manipulate them.
+ *
+ * The idea here is to be as generic as possible with the tree
+ * manipulation code.
+ */
+struct ocfs2_path_item {
+ struct buffer_head *bh;
+ struct ocfs2_extent_list *el;
+};
-static int ocfs2_add_branch(struct ocfs2_super *osb,
- handle_t *handle,
- struct inode *inode,
- struct buffer_head *fe_bh,
- struct buffer_head *eb_bh,
- struct buffer_head *last_eb_bh,
- struct ocfs2_alloc_context *meta_ac);
+#define OCFS2_MAX_PATH_DEPTH 5
-static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
- handle_t *handle,
- struct inode *inode,
- struct buffer_head *fe_bh,
- struct ocfs2_alloc_context *meta_ac,
- struct buffer_head **ret_new_eb_bh);
+struct ocfs2_path {
+ int p_tree_depth;
+ struct ocfs2_path_item p_node[OCFS2_MAX_PATH_DEPTH];
+};
-static int ocfs2_do_insert_extent(struct ocfs2_super *osb,
- handle_t *handle,
- struct inode *inode,
- struct buffer_head *fe_bh,
- u64 blkno,
- u32 new_clusters);
+#define path_root_bh(_path) ((_path)->p_node[0].bh)
+#define path_root_el(_path) ((_path)->p_node[0].el)
+#define path_leaf_bh(_path) ((_path)->p_node[(_path)->p_tree_depth].bh)
+#define path_leaf_el(_path) ((_path)->p_node[(_path)->p_tree_depth].el)
+#define path_num_items(_path) ((_path)->p_tree_depth + 1)
-static int ocfs2_find_branch_target(struct ocfs2_super *osb,
- struct inode *inode,
- struct buffer_head *fe_bh,
- struct buffer_head **target_bh);
+/*
+ * Reset the actual path elements so that we can re-use the structure
+ * to build another path. Generally, this involves freeing the buffer
+ * heads.
+ */
+static void ocfs2_reinit_path(struct ocfs2_path *path, int keep_root)
+{
+ int i, start = 0, depth = 0;
+ struct ocfs2_path_item *node;
-static int ocfs2_find_new_last_ext_blk(struct ocfs2_super *osb,
- struct inode *inode,
- struct ocfs2_dinode *fe,
- unsigned int new_i_clusters,
- struct buffer_head *old_last_eb,
- struct buffer_head **new_last_eb);
+ if (keep_root)
+ start = 1;
-static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc);
+ for(i = start; i < path_num_items(path); i++) {
+ node = &path->p_node[i];
+
+ brelse(node->bh);
+ node->bh = NULL;
+ node->el = NULL;
+ }
+
+ /*
+ * Tree depth may change during truncate, or insert. If we're
+ * keeping the root extent list, then make sure that our path
+ * structure reflects the proper depth.
+ */
+ if (keep_root)
+ depth = le16_to_cpu(path_root_el(path)->l_tree_depth);
+
+ path->p_tree_depth = depth;
+}
+
+static void ocfs2_free_path(struct ocfs2_path *path)
+{
+ if (path) {
+ ocfs2_reinit_path(path, 0);
+ kfree(path);
+ }
+}
+
+/*
+ * Make the *dest path the same as src and re-initialize src path to
+ * have a root only.
+ */
+static void ocfs2_mv_path(struct ocfs2_path *dest, struct ocfs2_path *src)
+{
+ int i;
+
+ BUG_ON(path_root_bh(dest) != path_root_bh(src));
+
+ for(i = 1; i < OCFS2_MAX_PATH_DEPTH; i++) {
+ brelse(dest->p_node[i].bh);
+
+ dest->p_node[i].bh = src->p_node[i].bh;
+ dest->p_node[i].el = src->p_node[i].el;
+
+ src->p_node[i].bh = NULL;
+ src->p_node[i].el = NULL;
+ }
+}
+
+/*
+ * Insert an extent block at given index.
+ *
+ * This will not take an additional reference on eb_bh.
+ */
+static inline void ocfs2_path_insert_eb(struct ocfs2_path *path, int index,
+ struct buffer_head *eb_bh)
+{
+ struct ocfs2_extent_block *eb = (struct ocfs2_extent_block *)eb_bh->b_data;
+
+ /*
+ * Right now, no root bh is an extent block, so this helps
+ * catch code errors with dinode trees. The assertion can be
+ * safely removed if we ever need to insert extent block
+ * structures at the root.
+ */
+ BUG_ON(index == 0);
+
+ path->p_node[index].bh = eb_bh;
+ path->p_node[index].el = &eb->h_list;
+}
+
+static struct ocfs2_path *ocfs2_new_path(struct buffer_head *root_bh,
+ struct ocfs2_extent_list *root_el)
+{
+ struct ocfs2_path *path;
-static int ocfs2_extent_contig(struct inode *inode,
- struct ocfs2_extent_rec *ext,
- u64 blkno)
+ BUG_ON(le16_to_cpu(root_el->l_tree_depth) >= OCFS2_MAX_PATH_DEPTH);
+
+ path = kzalloc(sizeof(*path), GFP_NOFS);
+ if (path) {
+ path->p_tree_depth = le16_to_cpu(root_el->l_tree_depth);
+ get_bh(root_bh);
+ path_root_bh(path) = root_bh;
+ path_root_el(path) = root_el;
+ }
+
+ return path;
+}
+
+/*
+ * Allocate and initialize a new path based on a disk inode tree.
+ */
+static struct ocfs2_path *ocfs2_new_inode_path(struct buffer_head *di_bh)
+{
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+ struct ocfs2_extent_list *el = &di->id2.i_list;
+
+ return ocfs2_new_path(di_bh, el);
+}
+
+/*
+ * Convenience function to journal all components in a path.
+ */
+static int ocfs2_journal_access_path(struct inode *inode, handle_t *handle,
+ struct ocfs2_path *path)
+{
+ int i, ret = 0;
+
+ if (!path)
+ goto out;
+
+ for(i = 0; i < path_num_items(path); i++) {
+ ret = ocfs2_journal_access(handle, inode, path->p_node[i].bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+ }
+
+out:
+ return ret;
+}
+
+enum ocfs2_contig_type {
+ CONTIG_NONE = 0,
+ CONTIG_LEFT,
+ CONTIG_RIGHT
+};
+
+static int ocfs2_block_extent_contig(struct super_block *sb,
+ struct ocfs2_extent_rec *ext,
+ u64 blkno)
{
return blkno == (le64_to_cpu(ext->e_blkno) +
- ocfs2_clusters_to_blocks(inode->i_sb,
+ ocfs2_clusters_to_blocks(sb,
le32_to_cpu(ext->e_clusters)));
}
+static int ocfs2_extents_adjacent(struct ocfs2_extent_rec *left,
+ struct ocfs2_extent_rec *right)
+{
+ return (le32_to_cpu(left->e_cpos) + le32_to_cpu(left->e_clusters) ==
+ le32_to_cpu(right->e_cpos));
+}
+
+static enum ocfs2_contig_type
+ ocfs2_extent_contig(struct inode *inode,
+ struct ocfs2_extent_rec *ext,
+ struct ocfs2_extent_rec *insert_rec)
+{
+ u64 blkno = le64_to_cpu(insert_rec->e_blkno);
+
+ if (ocfs2_extents_adjacent(ext, insert_rec) &&
+ ocfs2_block_extent_contig(inode->i_sb, ext, blkno))
+ return CONTIG_RIGHT;
+
+ blkno = le64_to_cpu(ext->e_blkno);
+ if (ocfs2_extents_adjacent(insert_rec, ext) &&
+ ocfs2_block_extent_contig(inode->i_sb, insert_rec, blkno))
+ return CONTIG_LEFT;
+
+ return CONTIG_NONE;
+}
+
+/*
+ * NOTE: We can have pretty much any combination of contiguousness and
+ * appending.
+ *
+ * The usefulness of APPEND_TAIL is more in that it lets us know that
+ * we'll have to update the path to that leaf.
+ */
+enum ocfs2_append_type {
+ APPEND_NONE = 0,
+ APPEND_TAIL,
+};
+
+struct ocfs2_insert_type {
+ enum ocfs2_append_type ins_appending;
+ enum ocfs2_contig_type ins_contig;
+ int ins_contig_index;
+ int ins_free_records;
+ int ins_tree_depth;
+};
+
/*
* How many free extents have we got before we need more meta data?
*/
return status;
}
+/*
+ * Helper function for ocfs2_add_branch() and ocfs2_shift_tree_depth().
+ *
+ * Returns the sum of the rightmost extent rec logical offset and
+ * cluster count.
+ *
+ * ocfs2_add_branch() uses this to determine what logical cluster
+ * value should be populated into the leftmost new branch records.
+ *
+ * ocfs2_shift_tree_depth() uses this to determine the # clusters
+ * value for the new topmost tree record.
+ */
+static inline u32 ocfs2_sum_rightmost_rec(struct ocfs2_extent_list *el)
+{
+ int i;
+
+ i = le16_to_cpu(el->l_next_free_rec) - 1;
+
+ return le32_to_cpu(el->l_recs[i].e_cpos) +
+ le32_to_cpu(el->l_recs[i].e_clusters);
+}
+
/*
* Add an entire tree branch to our inode. eb_bh is the extent block
* to start at, if we don't want to start the branch at the dinode
struct ocfs2_extent_block *eb;
struct ocfs2_extent_list *eb_el;
struct ocfs2_extent_list *el;
+ u32 new_cpos;
mlog_entry_void();
goto bail;
}
+ eb = (struct ocfs2_extent_block *)last_eb_bh->b_data;
+ new_cpos = ocfs2_sum_rightmost_rec(&eb->h_list);
+
/* Note: new_eb_bhs[new_blocks - 1] is the guy which will be
* linked with the rest of the tree.
* conversly, new_eb_bhs[0] is the new bottommost leaf.
eb->h_next_leaf_blk = 0;
eb_el->l_tree_depth = cpu_to_le16(i);
eb_el->l_next_free_rec = cpu_to_le16(1);
- eb_el->l_recs[0].e_cpos = fe->i_clusters;
+ /*
+ * This actually counts as an empty extent as
+ * c_clusters == 0
+ */
+ eb_el->l_recs[0].e_cpos = cpu_to_le32(new_cpos);
eb_el->l_recs[0].e_blkno = cpu_to_le64(next_blkno);
eb_el->l_recs[0].e_clusters = cpu_to_le32(0);
if (!eb_el->l_tree_depth)
* either be on the fe, or the extent block passed in. */
i = le16_to_cpu(el->l_next_free_rec);
el->l_recs[i].e_blkno = cpu_to_le64(next_blkno);
- el->l_recs[i].e_cpos = fe->i_clusters;
+ el->l_recs[i].e_cpos = cpu_to_le32(new_cpos);
el->l_recs[i].e_clusters = 0;
le16_add_cpu(&el->l_next_free_rec, 1);
struct buffer_head **ret_new_eb_bh)
{
int status, i;
+ u32 new_clusters;
struct buffer_head *new_eb_bh = NULL;
struct ocfs2_dinode *fe;
struct ocfs2_extent_block *eb;
goto bail;
}
+ new_clusters = ocfs2_sum_rightmost_rec(eb_el);
+
/* update fe now */
le16_add_cpu(&fe_el->l_tree_depth, 1);
fe_el->l_recs[0].e_cpos = 0;
fe_el->l_recs[0].e_blkno = eb->h_blkno;
- fe_el->l_recs[0].e_clusters = fe->i_clusters;
+ fe_el->l_recs[0].e_clusters = cpu_to_le32(new_clusters);
for(i = 1; i < le16_to_cpu(fe_el->l_next_free_rec); i++) {
fe_el->l_recs[i].e_cpos = 0;
fe_el->l_recs[i].e_clusters = 0;
return status;
}
-/*
- * Expects the tree to already have room in the rightmost leaf for the
- * extent. Updates all the extent blocks (and the dinode) on the way
- * down.
- */
-static int ocfs2_do_insert_extent(struct ocfs2_super *osb,
- handle_t *handle,
- struct inode *inode,
- struct buffer_head *fe_bh,
- u64 start_blk,
- u32 new_clusters)
-{
- int status, i, num_bhs = 0;
- u64 next_blkno;
- u16 next_free;
- struct buffer_head **eb_bhs = NULL;
- struct ocfs2_dinode *fe;
- struct ocfs2_extent_block *eb;
- struct ocfs2_extent_list *el;
-
- mlog_entry_void();
-
- status = ocfs2_journal_access(handle, inode, fe_bh,
- OCFS2_JOURNAL_ACCESS_WRITE);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
-
- fe = (struct ocfs2_dinode *) fe_bh->b_data;
- el = &fe->id2.i_list;
- if (el->l_tree_depth) {
- /* This is another operation where we want to be
- * careful about our tree updates. An error here means
- * none of the previous changes we made should roll
- * forward. As a result, we have to record the buffers
- * for this part of the tree in an array and reserve a
- * journal write to them before making any changes. */
- num_bhs = le16_to_cpu(fe->id2.i_list.l_tree_depth);
- eb_bhs = kcalloc(num_bhs, sizeof(struct buffer_head *),
- GFP_KERNEL);
- if (!eb_bhs) {
- status = -ENOMEM;
- mlog_errno(status);
- goto bail;
- }
-
- i = 0;
- while(el->l_tree_depth) {
- next_free = le16_to_cpu(el->l_next_free_rec);
- if (next_free == 0) {
- ocfs2_error(inode->i_sb,
- "Dinode %llu has a bad extent list",
- (unsigned long long)OCFS2_I(inode)->ip_blkno);
- status = -EIO;
- goto bail;
- }
- next_blkno = le64_to_cpu(el->l_recs[next_free - 1].e_blkno);
-
- BUG_ON(i >= num_bhs);
- status = ocfs2_read_block(osb, next_blkno, &eb_bhs[i],
- OCFS2_BH_CACHED, inode);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
- eb = (struct ocfs2_extent_block *) eb_bhs[i]->b_data;
- if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
- OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb,
- eb);
- status = -EIO;
- goto bail;
- }
-
- status = ocfs2_journal_access(handle, inode, eb_bhs[i],
- OCFS2_JOURNAL_ACCESS_WRITE);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
-
- el = &eb->h_list;
- i++;
- /* When we leave this loop, eb_bhs[num_bhs - 1] will
- * hold the bottom-most leaf extent block. */
- }
- BUG_ON(el->l_tree_depth);
-
- el = &fe->id2.i_list;
- /* If we have tree depth, then the fe update is
- * trivial, and we want to switch el out for the
- * bottom-most leaf in order to update it with the
- * actual extent data below. */
- next_free = le16_to_cpu(el->l_next_free_rec);
- if (next_free == 0) {
- ocfs2_error(inode->i_sb,
- "Dinode %llu has a bad extent list",
- (unsigned long long)OCFS2_I(inode)->ip_blkno);
- status = -EIO;
- goto bail;
- }
- le32_add_cpu(&el->l_recs[next_free - 1].e_clusters,
- new_clusters);
- /* (num_bhs - 1) to avoid the leaf */
- for(i = 0; i < (num_bhs - 1); i++) {
- eb = (struct ocfs2_extent_block *) eb_bhs[i]->b_data;
- el = &eb->h_list;
-
- /* finally, make our actual change to the
- * intermediate extent blocks. */
- next_free = le16_to_cpu(el->l_next_free_rec);
- le32_add_cpu(&el->l_recs[next_free - 1].e_clusters,
- new_clusters);
-
- status = ocfs2_journal_dirty(handle, eb_bhs[i]);
- if (status < 0)
- mlog_errno(status);
- }
- BUG_ON(i != (num_bhs - 1));
- /* note that the leaf block wasn't touched in
- * the loop above */
- eb = (struct ocfs2_extent_block *) eb_bhs[num_bhs - 1]->b_data;
- el = &eb->h_list;
- BUG_ON(el->l_tree_depth);
- }
-
- /* yay, we can finally add the actual extent now! */
- i = le16_to_cpu(el->l_next_free_rec) - 1;
- if (le16_to_cpu(el->l_next_free_rec) &&
- ocfs2_extent_contig(inode, &el->l_recs[i], start_blk)) {
- le32_add_cpu(&el->l_recs[i].e_clusters, new_clusters);
- } else if (le16_to_cpu(el->l_next_free_rec) &&
- (le32_to_cpu(el->l_recs[i].e_clusters) == 0)) {
- /* having an empty extent at eof is legal. */
- if (el->l_recs[i].e_cpos != fe->i_clusters) {
- ocfs2_error(inode->i_sb,
- "Dinode %llu trailing extent is bad: "
- "cpos (%u) != number of clusters (%u)",
- (unsigned long long)OCFS2_I(inode)->ip_blkno,
- le32_to_cpu(el->l_recs[i].e_cpos),
- le32_to_cpu(fe->i_clusters));
- status = -EIO;
- goto bail;
- }
- el->l_recs[i].e_blkno = cpu_to_le64(start_blk);
- el->l_recs[i].e_clusters = cpu_to_le32(new_clusters);
- } else {
- /* No contiguous record, or no empty record at eof, so
- * we add a new one. */
-
- BUG_ON(le16_to_cpu(el->l_next_free_rec) >=
- le16_to_cpu(el->l_count));
- i = le16_to_cpu(el->l_next_free_rec);
-
- el->l_recs[i].e_blkno = cpu_to_le64(start_blk);
- el->l_recs[i].e_clusters = cpu_to_le32(new_clusters);
- el->l_recs[i].e_cpos = fe->i_clusters;
- le16_add_cpu(&el->l_next_free_rec, 1);
- }
-
- /*
- * extent_map errors are not fatal, so they are ignored outside
- * of flushing the thing.
- */
- status = ocfs2_extent_map_append(inode, &el->l_recs[i],
- new_clusters);
- if (status) {
- mlog_errno(status);
- ocfs2_extent_map_drop(inode, le32_to_cpu(fe->i_clusters));
- }
-
- status = ocfs2_journal_dirty(handle, fe_bh);
- if (status < 0)
- mlog_errno(status);
- if (fe->id2.i_list.l_tree_depth) {
- status = ocfs2_journal_dirty(handle, eb_bhs[num_bhs - 1]);
- if (status < 0)
- mlog_errno(status);
- }
-
- status = 0;
-bail:
- if (eb_bhs) {
- for (i = 0; i < num_bhs; i++)
- if (eb_bhs[i])
- brelse(eb_bhs[i]);
- kfree(eb_bhs);
- }
-
- mlog_exit(status);
- return status;
-}
-
/*
* Should only be called when there is no space left in any of the
* leaf nodes. What we want to do is find the lowest tree depth
mlog_errno(status);
goto bail;
}
-
+
+ eb = (struct ocfs2_extent_block *) bh->b_data;
+ if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
+ OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
+ status = -EIO;
+ goto bail;
+ }
+ el = &eb->h_list;
+
+ if (le16_to_cpu(el->l_next_free_rec) <
+ le16_to_cpu(el->l_count)) {
+ if (lowest_bh)
+ brelse(lowest_bh);
+ lowest_bh = bh;
+ get_bh(lowest_bh);
+ }
+ }
+
+ /* If we didn't find one and the fe doesn't have any room,
+ * then return '1' */
+ if (!lowest_bh
+ && (fe->id2.i_list.l_next_free_rec == fe->id2.i_list.l_count))
+ status = 1;
+
+ *target_bh = lowest_bh;
+bail:
+ if (bh)
+ brelse(bh);
+
+ mlog_exit(status);
+ return status;
+}
+
+static inline int ocfs2_is_empty_extent(struct ocfs2_extent_rec *rec)
+{
+ return !rec->e_clusters;
+}
+
+/*
+ * This function will discard the rightmost extent record.
+ */
+static void ocfs2_shift_records_right(struct ocfs2_extent_list *el)
+{
+ int next_free = le16_to_cpu(el->l_next_free_rec);
+ int count = le16_to_cpu(el->l_count);
+ unsigned int num_bytes;
+
+ BUG_ON(!next_free);
+ /* This will cause us to go off the end of our extent list. */
+ BUG_ON(next_free >= count);
+
+ num_bytes = sizeof(struct ocfs2_extent_rec) * next_free;
+
+ memmove(&el->l_recs[1], &el->l_recs[0], num_bytes);
+}
+
+static void ocfs2_rotate_leaf(struct ocfs2_extent_list *el,
+ struct ocfs2_extent_rec *insert_rec)
+{
+ int i, insert_index, next_free, has_empty, num_bytes;
+ u32 insert_cpos = le32_to_cpu(insert_rec->e_cpos);
+ struct ocfs2_extent_rec *rec;
+
+ next_free = le16_to_cpu(el->l_next_free_rec);
+ has_empty = ocfs2_is_empty_extent(&el->l_recs[0]);
+
+ BUG_ON(!next_free);
+
+ /* The tree code before us didn't allow enough room in the leaf. */
+ if (el->l_next_free_rec == el->l_count && !has_empty)
+ BUG();
+
+ /*
+ * The easiest way to approach this is to just remove the
+ * empty extent and temporarily decrement next_free.
+ */
+ if (has_empty) {
+ /*
+ * If next_free was 1 (only an empty extent), this
+ * loop won't execute, which is fine. We still want
+ * the decrement above to happen.
+ */
+ for(i = 0; i < (next_free - 1); i++)
+ el->l_recs[i] = el->l_recs[i+1];
+
+ next_free--;
+ }
+
+ /*
+ * Figure out what the new record index should be.
+ */
+ for(i = 0; i < next_free; i++) {
+ rec = &el->l_recs[i];
+
+ if (insert_cpos < le32_to_cpu(rec->e_cpos))
+ break;
+ }
+ insert_index = i;
+
+ mlog(0, "ins %u: index %d, has_empty %d, next_free %d, count %d\n",
+ insert_cpos, insert_index, has_empty, next_free, le16_to_cpu(el->l_count));
+
+ BUG_ON(insert_index < 0);
+ BUG_ON(insert_index >= le16_to_cpu(el->l_count));
+ BUG_ON(insert_index > next_free);
+
+ /*
+ * No need to memmove if we're just adding to the tail.
+ */
+ if (insert_index != next_free) {
+ BUG_ON(next_free >= le16_to_cpu(el->l_count));
+
+ num_bytes = next_free - insert_index;
+ num_bytes *= sizeof(struct ocfs2_extent_rec);
+ memmove(&el->l_recs[insert_index + 1],
+ &el->l_recs[insert_index],
+ num_bytes);
+ }
+
+ /*
+ * Either we had an empty extent, and need to re-increment or
+ * there was no empty extent on a non full rightmost leaf node,
+ * in which case we still need to increment.
+ */
+ next_free++;
+ el->l_next_free_rec = cpu_to_le16(next_free);
+ /*
+ * Make sure none of the math above just messed up our tree.
+ */
+ BUG_ON(le16_to_cpu(el->l_next_free_rec) > le16_to_cpu(el->l_count));
+
+ el->l_recs[insert_index] = *insert_rec;
+
+}
+
+/*
+ * Create an empty extent record .
+ *
+ * l_next_free_rec may be updated.
+ *
+ * If an empty extent already exists do nothing.
+ */
+static void ocfs2_create_empty_extent(struct ocfs2_extent_list *el)
+{
+ int next_free = le16_to_cpu(el->l_next_free_rec);
+
+ if (next_free == 0)
+ goto set_and_inc;
+
+ if (ocfs2_is_empty_extent(&el->l_recs[0]))
+ return;
+
+ mlog_bug_on_msg(el->l_count == el->l_next_free_rec,
+ "Asked to create an empty extent in a full list:\n"
+ "count = %u, tree depth = %u",
+ le16_to_cpu(el->l_count),
+ le16_to_cpu(el->l_tree_depth));
+
+ ocfs2_shift_records_right(el);
+
+set_and_inc:
+ le16_add_cpu(&el->l_next_free_rec, 1);
+ memset(&el->l_recs[0], 0, sizeof(struct ocfs2_extent_rec));
+}
+
+/*
+ * For a rotation which involves two leaf nodes, the "root node" is
+ * the lowest level tree node which contains a path to both leafs. This
+ * resulting set of information can be used to form a complete "subtree"
+ *
+ * This function is passed two full paths from the dinode down to a
+ * pair of adjacent leaves. It's task is to figure out which path
+ * index contains the subtree root - this can be the root index itself
+ * in a worst-case rotation.
+ *
+ * The array index of the subtree root is passed back.
+ */
+static int ocfs2_find_subtree_root(struct inode *inode,
+ struct ocfs2_path *left,
+ struct ocfs2_path *right)
+{
+ int i = 0;
+
+ /*
+ * Check that the caller passed in two paths from the same tree.
+ */
+ BUG_ON(path_root_bh(left) != path_root_bh(right));
+
+ do {
+ i++;
+
+ /*
+ * The caller didn't pass two adjacent paths.
+ */
+ mlog_bug_on_msg(i > left->p_tree_depth,
+ "Inode %lu, left depth %u, right depth %u\n"
+ "left leaf blk %llu, right leaf blk %llu\n",
+ inode->i_ino, left->p_tree_depth,
+ right->p_tree_depth,
+ (unsigned long long)path_leaf_bh(left)->b_blocknr,
+ (unsigned long long)path_leaf_bh(right)->b_blocknr);
+ } while (left->p_node[i].bh->b_blocknr ==
+ right->p_node[i].bh->b_blocknr);
+
+ return i - 1;
+}
+
+typedef void (path_insert_t)(void *, struct buffer_head *);
+
+/*
+ * Traverse a btree path in search of cpos, starting at root_el.
+ *
+ * This code can be called with a cpos larger than the tree, in which
+ * case it will return the rightmost path.
+ */
+static int __ocfs2_find_path(struct inode *inode,
+ struct ocfs2_extent_list *root_el, u32 cpos,
+ path_insert_t *func, void *data)
+{
+ int i, ret = 0;
+ u32 range;
+ u64 blkno;
+ struct buffer_head *bh = NULL;
+ struct ocfs2_extent_block *eb;
+ struct ocfs2_extent_list *el;
+ struct ocfs2_extent_rec *rec;
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
+
+ el = root_el;
+ while (el->l_tree_depth) {
+ if (le16_to_cpu(el->l_next_free_rec) == 0) {
+ ocfs2_error(inode->i_sb,
+ "Inode %llu has empty extent list at "
+ "depth %u\n",
+ (unsigned long long)oi->ip_blkno,
+ le16_to_cpu(el->l_tree_depth));
+ ret = -EROFS;
+ goto out;
+
+ }
+
+ for(i = 0; i < le16_to_cpu(el->l_next_free_rec) - 1; i++) {
+ rec = &el->l_recs[i];
+
+ /*
+ * In the case that cpos is off the allocation
+ * tree, this should just wind up returning the
+ * rightmost record.
+ */
+ range = le32_to_cpu(rec->e_cpos) +
+ le32_to_cpu(rec->e_clusters);
+ if (cpos >= le32_to_cpu(rec->e_cpos) && cpos < range)
+ break;
+ }
+
+ blkno = le64_to_cpu(el->l_recs[i].e_blkno);
+ if (blkno == 0) {
+ ocfs2_error(inode->i_sb,
+ "Inode %llu has bad blkno in extent list "
+ "at depth %u (index %d)\n",
+ (unsigned long long)oi->ip_blkno,
+ le16_to_cpu(el->l_tree_depth), i);
+ ret = -EROFS;
+ goto out;
+ }
+
+ brelse(bh);
+ bh = NULL;
+ ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
+ &bh, OCFS2_BH_CACHED, inode);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ eb = (struct ocfs2_extent_block *) bh->b_data;
+ el = &eb->h_list;
+ if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
+ OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
+ ret = -EIO;
+ goto out;
+ }
+
+ if (le16_to_cpu(el->l_next_free_rec) >
+ le16_to_cpu(el->l_count)) {
+ ocfs2_error(inode->i_sb,
+ "Inode %llu has bad count in extent list "
+ "at block %llu (next free=%u, count=%u)\n",
+ (unsigned long long)oi->ip_blkno,
+ (unsigned long long)bh->b_blocknr,
+ le16_to_cpu(el->l_next_free_rec),
+ le16_to_cpu(el->l_count));
+ ret = -EROFS;
+ goto out;
+ }
+
+ if (func)
+ func(data, bh);
+ }
+
+out:
+ /*
+ * Catch any trailing bh that the loop didn't handle.
+ */
+ brelse(bh);
+
+ return ret;
+}
+
+/*
+ * Given an initialized path (that is, it has a valid root extent
+ * list), this function will traverse the btree in search of the path
+ * which would contain cpos.
+ *
+ * The path traveled is recorded in the path structure.
+ *
+ * Note that this will not do any comparisons on leaf node extent
+ * records, so it will work fine in the case that we just added a tree
+ * branch.
+ */
+struct find_path_data {
+ int index;
+ struct ocfs2_path *path;
+};
+static void find_path_ins(void *data, struct buffer_head *bh)
+{
+ struct find_path_data *fp = data;
+
+ get_bh(bh);
+ ocfs2_path_insert_eb(fp->path, fp->index, bh);
+ fp->index++;
+}
+static int ocfs2_find_path(struct inode *inode, struct ocfs2_path *path,
+ u32 cpos)
+{
+ struct find_path_data data;
+
+ data.index = 1;
+ data.path = path;
+ return __ocfs2_find_path(inode, path_root_el(path), cpos,
+ find_path_ins, &data);
+}
+
+static void find_leaf_ins(void *data, struct buffer_head *bh)
+{
+ struct ocfs2_extent_block *eb =(struct ocfs2_extent_block *)bh->b_data;
+ struct ocfs2_extent_list *el = &eb->h_list;
+ struct buffer_head **ret = data;
+
+ /* We want to retain only the leaf block. */
+ if (le16_to_cpu(el->l_tree_depth) == 0) {
+ get_bh(bh);
+ *ret = bh;
+ }
+}
+/*
+ * Find the leaf block in the tree which would contain cpos. No
+ * checking of the actual leaf is done.
+ *
+ * Some paths want to call this instead of allocating a path structure
+ * and calling ocfs2_find_path().
+ *
+ * This function doesn't handle non btree extent lists.
+ */
+static int ocfs2_find_leaf(struct inode *inode,
+ struct ocfs2_extent_list *root_el, u32 cpos,
+ struct buffer_head **leaf_bh)
+{
+ int ret;
+ struct buffer_head *bh = NULL;
+
+ ret = __ocfs2_find_path(inode, root_el, cpos, find_leaf_ins, &bh);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ *leaf_bh = bh;
+out:
+ return ret;
+}
+
+/*
+ * Adjust the adjacent records (left_rec, right_rec) involved in a rotation.
+ *
+ * Basically, we've moved stuff around at the bottom of the tree and
+ * we need to fix up the extent records above the changes to reflect
+ * the new changes.
+ *
+ * left_rec: the record on the left.
+ * left_child_el: is the child list pointed to by left_rec
+ * right_rec: the record to the right of left_rec
+ * right_child_el: is the child list pointed to by right_rec
+ *
+ * By definition, this only works on interior nodes.
+ */
+static void ocfs2_adjust_adjacent_records(struct ocfs2_extent_rec *left_rec,
+ struct ocfs2_extent_list *left_child_el,
+ struct ocfs2_extent_rec *right_rec,
+ struct ocfs2_extent_list *right_child_el)
+{
+ u32 left_clusters, right_end;
+
+ /*
+ * Interior nodes never have holes. Their cpos is the cpos of
+ * the leftmost record in their child list. Their cluster
+ * count covers the full theoretical range of their child list
+ * - the range between their cpos and the cpos of the record
+ * immediately to their right.
+ */
+ left_clusters = le32_to_cpu(right_child_el->l_recs[0].e_cpos);
+ left_clusters -= le32_to_cpu(left_rec->e_cpos);
+ left_rec->e_clusters = cpu_to_le32(left_clusters);
+
+ /*
+ * Calculate the rightmost cluster count boundary before
+ * moving cpos - we will need to adjust e_clusters after
+ * updating e_cpos to keep the same highest cluster count.
+ */
+ right_end = le32_to_cpu(right_rec->e_cpos);
+ right_end += le32_to_cpu(right_rec->e_clusters);
+
+ right_rec->e_cpos = left_rec->e_cpos;
+ le32_add_cpu(&right_rec->e_cpos, left_clusters);
+
+ right_end -= le32_to_cpu(right_rec->e_cpos);
+ right_rec->e_clusters = cpu_to_le32(right_end);
+}
+
+/*
+ * Adjust the adjacent root node records involved in a
+ * rotation. left_el_blkno is passed in as a key so that we can easily
+ * find it's index in the root list.
+ */
+static void ocfs2_adjust_root_records(struct ocfs2_extent_list *root_el,
+ struct ocfs2_extent_list *left_el,
+ struct ocfs2_extent_list *right_el,
+ u64 left_el_blkno)
+{
+ int i;
+
+ BUG_ON(le16_to_cpu(root_el->l_tree_depth) <=
+ le16_to_cpu(left_el->l_tree_depth));
+
+ for(i = 0; i < le16_to_cpu(root_el->l_next_free_rec) - 1; i++) {
+ if (le64_to_cpu(root_el->l_recs[i].e_blkno) == left_el_blkno)
+ break;
+ }
+
+ /*
+ * The path walking code should have never returned a root and
+ * two paths which are not adjacent.
+ */
+ BUG_ON(i >= (le16_to_cpu(root_el->l_next_free_rec) - 1));
+
+ ocfs2_adjust_adjacent_records(&root_el->l_recs[i], left_el,
+ &root_el->l_recs[i + 1], right_el);
+}
+
+/*
+ * We've changed a leaf block (in right_path) and need to reflect that
+ * change back up the subtree.
+ *
+ * This happens in multiple places:
+ * - When we've moved an extent record from the left path leaf to the right
+ * path leaf to make room for an empty extent in the left path leaf.
+ * - When our insert into the right path leaf is at the leftmost edge
+ * and requires an update of the path immediately to it's left. This
+ * can occur at the end of some types of rotation and appending inserts.
+ */
+static void ocfs2_complete_edge_insert(struct inode *inode, handle_t *handle,
+ struct ocfs2_path *left_path,
+ struct ocfs2_path *right_path,
+ int subtree_index)
+{
+ int ret, i, idx;
+ struct ocfs2_extent_list *el, *left_el, *right_el;
+ struct ocfs2_extent_rec *left_rec, *right_rec;
+ struct buffer_head *root_bh = left_path->p_node[subtree_index].bh;
+
+ /*
+ * Update the counts and position values within all the
+ * interior nodes to reflect the leaf rotation we just did.
+ *
+ * The root node is handled below the loop.
+ *
+ * We begin the loop with right_el and left_el pointing to the
+ * leaf lists and work our way up.
+ *
+ * NOTE: within this loop, left_el and right_el always refer
+ * to the *child* lists.
+ */
+ left_el = path_leaf_el(left_path);
+ right_el = path_leaf_el(right_path);
+ for(i = left_path->p_tree_depth - 1; i > subtree_index; i--) {
+ mlog(0, "Adjust records at index %u\n", i);
+
+ /*
+ * One nice property of knowing that all of these
+ * nodes are below the root is that we only deal with
+ * the leftmost right node record and the rightmost
+ * left node record.
+ */
+ el = left_path->p_node[i].el;
+ idx = le16_to_cpu(left_el->l_next_free_rec) - 1;
+ left_rec = &el->l_recs[idx];
+
+ el = right_path->p_node[i].el;
+ right_rec = &el->l_recs[0];
+
+ ocfs2_adjust_adjacent_records(left_rec, left_el, right_rec,
+ right_el);
+
+ ret = ocfs2_journal_dirty(handle, left_path->p_node[i].bh);
+ if (ret)
+ mlog_errno(ret);
+
+ ret = ocfs2_journal_dirty(handle, right_path->p_node[i].bh);
+ if (ret)
+ mlog_errno(ret);
+
+ /*
+ * Setup our list pointers now so that the current
+ * parents become children in the next iteration.
+ */
+ left_el = left_path->p_node[i].el;
+ right_el = right_path->p_node[i].el;
+ }
+
+ /*
+ * At the root node, adjust the two adjacent records which
+ * begin our path to the leaves.
+ */
+
+ el = left_path->p_node[subtree_index].el;
+ left_el = left_path->p_node[subtree_index + 1].el;
+ right_el = right_path->p_node[subtree_index + 1].el;
+
+ ocfs2_adjust_root_records(el, left_el, right_el,
+ left_path->p_node[subtree_index + 1].bh->b_blocknr);
+
+ root_bh = left_path->p_node[subtree_index].bh;
+
+ ret = ocfs2_journal_dirty(handle, root_bh);
+ if (ret)
+ mlog_errno(ret);
+}
+
+static int ocfs2_rotate_subtree_right(struct inode *inode,
+ handle_t *handle,
+ struct ocfs2_path *left_path,
+ struct ocfs2_path *right_path,
+ int subtree_index)
+{
+ int ret, i;
+ struct buffer_head *right_leaf_bh;
+ struct buffer_head *left_leaf_bh = NULL;
+ struct buffer_head *root_bh;
+ struct ocfs2_extent_list *right_el, *left_el;
+ struct ocfs2_extent_rec move_rec;
+
+ left_leaf_bh = path_leaf_bh(left_path);
+ left_el = path_leaf_el(left_path);
+
+ if (left_el->l_next_free_rec != left_el->l_count) {
+ ocfs2_error(inode->i_sb,
+ "Inode %llu has non-full interior leaf node %llu"
+ "(next free = %u)",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno,
+ (unsigned long long)left_leaf_bh->b_blocknr,
+ le16_to_cpu(left_el->l_next_free_rec));
+ return -EROFS;
+ }
+
+ /*
+ * This extent block may already have an empty record, so we
+ * return early if so.
+ */
+ if (ocfs2_is_empty_extent(&left_el->l_recs[0]))
+ return 0;
+
+ root_bh = left_path->p_node[subtree_index].bh;
+ BUG_ON(root_bh != right_path->p_node[subtree_index].bh);
+
+ ret = ocfs2_journal_access(handle, inode, root_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ for(i = subtree_index + 1; i < path_num_items(right_path); i++) {
+ ret = ocfs2_journal_access(handle, inode,
+ right_path->p_node[i].bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_journal_access(handle, inode,
+ left_path->p_node[i].bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+ }
+
+ right_leaf_bh = path_leaf_bh(right_path);
+ right_el = path_leaf_el(right_path);
+
+ /* This is a code error, not a disk corruption. */
+ mlog_bug_on_msg(!right_el->l_next_free_rec, "Inode %llu: Rotate fails "
+ "because rightmost leaf block %llu is empty\n",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno,
+ (unsigned long long)right_leaf_bh->b_blocknr);
+
+ ocfs2_create_empty_extent(right_el);
+
+ ret = ocfs2_journal_dirty(handle, right_leaf_bh);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /* Do the copy now. */
+ i = le16_to_cpu(left_el->l_next_free_rec) - 1;
+ move_rec = left_el->l_recs[i];
+ right_el->l_recs[0] = move_rec;
+
+ /*
+ * Clear out the record we just copied and shift everything
+ * over, leaving an empty extent in the left leaf.
+ *
+ * We temporarily subtract from next_free_rec so that the
+ * shift will lose the tail record (which is now defunct).
+ */
+ le16_add_cpu(&left_el->l_next_free_rec, -1);
+ ocfs2_shift_records_right(left_el);
+ memset(&left_el->l_recs[0], 0, sizeof(struct ocfs2_extent_rec));
+ le16_add_cpu(&left_el->l_next_free_rec, 1);
+
+ ret = ocfs2_journal_dirty(handle, left_leaf_bh);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ocfs2_complete_edge_insert(inode, handle, left_path, right_path,
+ subtree_index);
+
+out:
+ return ret;
+}
+
+/*
+ * Given a full path, determine what cpos value would return us a path
+ * containing the leaf immediately to the left of the current one.
+ *
+ * Will return zero if the path passed in is already the leftmost path.
+ */
+static int ocfs2_find_cpos_for_left_leaf(struct super_block *sb,
+ struct ocfs2_path *path, u32 *cpos)
+{
+ int i, j, ret = 0;
+ u64 blkno;
+ struct ocfs2_extent_list *el;
+
+ *cpos = 0;
+
+ blkno = path_leaf_bh(path)->b_blocknr;
+
+ /* Start at the tree node just above the leaf and work our way up. */
+ i = path->p_tree_depth - 1;
+ while (i >= 0) {
+ el = path->p_node[i].el;
+
+ /*
+ * Find the extent record just before the one in our
+ * path.
+ */
+ for(j = 0; j < le16_to_cpu(el->l_next_free_rec); j++) {
+ if (le64_to_cpu(el->l_recs[j].e_blkno) == blkno) {
+ if (j == 0) {
+ if (i == 0) {
+ /*
+ * We've determined that the
+ * path specified is already
+ * the leftmost one - return a
+ * cpos of zero.
+ */
+ goto out;
+ }
+ /*
+ * The leftmost record points to our
+ * leaf - we need to travel up the
+ * tree one level.
+ */
+ goto next_node;
+ }
+
+ *cpos = le32_to_cpu(el->l_recs[j - 1].e_cpos);
+ *cpos = *cpos + le32_to_cpu(el->l_recs[j - 1].e_clusters) - 1;
+ goto out;
+ }
+ }
+
+ /*
+ * If we got here, we never found a valid node where
+ * the tree indicated one should be.
+ */
+ ocfs2_error(sb,
+ "Invalid extent tree at extent block %llu\n",
+ (unsigned long long)blkno);
+ ret = -EROFS;
+ goto out;
+
+next_node:
+ blkno = path->p_node[i].bh->b_blocknr;
+ i--;
+ }
+
+out:
+ return ret;
+}
+
+static int ocfs2_extend_rotate_transaction(handle_t *handle, int subtree_depth,
+ struct ocfs2_path *path)
+{
+ int credits = (path->p_tree_depth - subtree_depth) * 2 + 1;
+
+ if (handle->h_buffer_credits < credits)
+ return ocfs2_extend_trans(handle, credits);
+
+ return 0;
+}
+
+/*
+ * Trap the case where we're inserting into the theoretical range past
+ * the _actual_ left leaf range. Otherwise, we'll rotate a record
+ * whose cpos is less than ours into the right leaf.
+ *
+ * It's only necessary to look at the rightmost record of the left
+ * leaf because the logic that calls us should ensure that the
+ * theoretical ranges in the path components above the leaves are
+ * correct.
+ */
+static int ocfs2_rotate_requires_path_adjustment(struct ocfs2_path *left_path,
+ u32 insert_cpos)
+{
+ struct ocfs2_extent_list *left_el;
+ struct ocfs2_extent_rec *rec;
+ int next_free;
+
+ left_el = path_leaf_el(left_path);
+ next_free = le16_to_cpu(left_el->l_next_free_rec);
+ rec = &left_el->l_recs[next_free - 1];
+
+ if (insert_cpos > le32_to_cpu(rec->e_cpos))
+ return 1;
+ return 0;
+}
+
+/*
+ * Rotate all the records in a btree right one record, starting at insert_cpos.
+ *
+ * The path to the rightmost leaf should be passed in.
+ *
+ * The array is assumed to be large enough to hold an entire path (tree depth).
+ *
+ * Upon succesful return from this function:
+ *
+ * - The 'right_path' array will contain a path to the leaf block
+ * whose range contains e_cpos.
+ * - That leaf block will have a single empty extent in list index 0.
+ * - In the case that the rotation requires a post-insert update,
+ * *ret_left_path will contain a valid path which can be passed to
+ * ocfs2_insert_path().
+ */
+static int ocfs2_rotate_tree_right(struct inode *inode,
+ handle_t *handle,
+ u32 insert_cpos,
+ struct ocfs2_path *right_path,
+ struct ocfs2_path **ret_left_path)
+{
+ int ret, start;
+ u32 cpos;
+ struct ocfs2_path *left_path = NULL;
+
+ *ret_left_path = NULL;
+
+ left_path = ocfs2_new_path(path_root_bh(right_path),
+ path_root_el(right_path));
+ if (!left_path) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, right_path, &cpos);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ mlog(0, "Insert: %u, first left path cpos: %u\n", insert_cpos, cpos);
+
+ /*
+ * What we want to do here is:
+ *
+ * 1) Start with the rightmost path.
+ *
+ * 2) Determine a path to the leaf block directly to the left
+ * of that leaf.
+ *
+ * 3) Determine the 'subtree root' - the lowest level tree node
+ * which contains a path to both leaves.
+ *
+ * 4) Rotate the subtree.
+ *
+ * 5) Find the next subtree by considering the left path to be
+ * the new right path.
+ *
+ * The check at the top of this while loop also accepts
+ * insert_cpos == cpos because cpos is only a _theoretical_
+ * value to get us the left path - insert_cpos might very well
+ * be filling that hole.
+ *
+ * Stop at a cpos of '0' because we either started at the
+ * leftmost branch (i.e., a tree with one branch and a
+ * rotation inside of it), or we've gone as far as we can in
+ * rotating subtrees.
+ */
+ while (cpos && insert_cpos <= cpos) {
+ mlog(0, "Rotating a tree: ins. cpos: %u, left path cpos: %u\n",
+ insert_cpos, cpos);
+
+ ret = ocfs2_find_path(inode, left_path, cpos);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ mlog_bug_on_msg(path_leaf_bh(left_path) ==
+ path_leaf_bh(right_path),
+ "Inode %lu: error during insert of %u "
+ "(left path cpos %u) results in two identical "
+ "paths ending at %llu\n",
+ inode->i_ino, insert_cpos, cpos,
+ (unsigned long long)
+ path_leaf_bh(left_path)->b_blocknr);
+
+ if (ocfs2_rotate_requires_path_adjustment(left_path,
+ insert_cpos)) {
+ mlog(0, "Path adjustment required\n");
+
+ /*
+ * We've rotated the tree as much as we
+ * should. The rest is up to
+ * ocfs2_insert_path() to complete, after the
+ * record insertion. We indicate this
+ * situation by returning the left path.
+ *
+ * The reason we don't adjust the records here
+ * before the record insert is that an error
+ * later might break the rule where a parent
+ * record e_cpos will reflect the actual
+ * e_cpos of the 1st nonempty record of the
+ * child list.
+ */
+ *ret_left_path = left_path;
+ goto out_ret_path;
+ }
+
+ start = ocfs2_find_subtree_root(inode, left_path, right_path);
+
+ mlog(0, "Subtree root at index %d (blk %llu, depth %d)\n",
+ start,
+ (unsigned long long) right_path->p_node[start].bh->b_blocknr,
+ right_path->p_tree_depth);
+
+ ret = ocfs2_extend_rotate_transaction(handle, start,
+ right_path);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_rotate_subtree_right(inode, handle, left_path,
+ right_path, start);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * There is no need to re-read the next right path
+ * as we know that it'll be our current left
+ * path. Optimize by copying values instead.
+ */
+ ocfs2_mv_path(right_path, left_path);
+
+ ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, right_path,
+ &cpos);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+ }
+
+out:
+ ocfs2_free_path(left_path);
+
+out_ret_path:
+ return ret;
+}
+
+/*
+ * Do the final bits of extent record insertion at the target leaf
+ * list. If this leaf is part of an allocation tree, it is assumed
+ * that the tree above has been prepared.
+ */
+static void ocfs2_insert_at_leaf(struct ocfs2_extent_rec *insert_rec,
+ struct ocfs2_extent_list *el,
+ struct ocfs2_insert_type *insert,
+ struct inode *inode)
+{
+ int i = insert->ins_contig_index;
+ unsigned int range;
+ struct ocfs2_extent_rec *rec;
+
+ BUG_ON(el->l_tree_depth);
+
+ /*
+ * Contiguous insert - either left or right.
+ */
+ if (insert->ins_contig != CONTIG_NONE) {
+ rec = &el->l_recs[i];
+ if (insert->ins_contig == CONTIG_LEFT) {
+ rec->e_blkno = insert_rec->e_blkno;
+ rec->e_cpos = insert_rec->e_cpos;
+ }
+ le32_add_cpu(&rec->e_clusters,
+ le32_to_cpu(insert_rec->e_clusters));
+ return;
+ }
+
+ /*
+ * Handle insert into an empty leaf.
+ */
+ if (le16_to_cpu(el->l_next_free_rec) == 0 ||
+ ((le16_to_cpu(el->l_next_free_rec) == 1) &&
+ ocfs2_is_empty_extent(&el->l_recs[0]))) {
+ el->l_recs[0] = *insert_rec;
+ el->l_next_free_rec = cpu_to_le16(1);
+ return;
+ }
+
+ /*
+ * Appending insert.
+ */
+ if (insert->ins_appending == APPEND_TAIL) {
+ i = le16_to_cpu(el->l_next_free_rec) - 1;
+ rec = &el->l_recs[i];
+ range = le32_to_cpu(rec->e_cpos) + le32_to_cpu(rec->e_clusters);
+ BUG_ON(le32_to_cpu(insert_rec->e_cpos) < range);
+
+ mlog_bug_on_msg(le16_to_cpu(el->l_next_free_rec) >=
+ le16_to_cpu(el->l_count),
+ "inode %lu, depth %u, count %u, next free %u, "
+ "rec.cpos %u, rec.clusters %u, "
+ "insert.cpos %u, insert.clusters %u\n",
+ inode->i_ino,
+ le16_to_cpu(el->l_tree_depth),
+ le16_to_cpu(el->l_count),
+ le16_to_cpu(el->l_next_free_rec),
+ le32_to_cpu(el->l_recs[i].e_cpos),
+ le32_to_cpu(el->l_recs[i].e_clusters),
+ le32_to_cpu(insert_rec->e_cpos),
+ le32_to_cpu(insert_rec->e_clusters));
+ i++;
+ el->l_recs[i] = *insert_rec;
+ le16_add_cpu(&el->l_next_free_rec, 1);
+ return;
+ }
+
+ /*
+ * Ok, we have to rotate.
+ *
+ * At this point, it is safe to assume that inserting into an
+ * empty leaf and appending to a leaf have both been handled
+ * above.
+ *
+ * This leaf needs to have space, either by the empty 1st
+ * extent record, or by virtue of an l_next_rec < l_count.
+ */
+ ocfs2_rotate_leaf(el, insert_rec);
+}
+
+static inline void ocfs2_update_dinode_clusters(struct inode *inode,
+ struct ocfs2_dinode *di,
+ u32 clusters)
+{
+ le32_add_cpu(&di->i_clusters, clusters);
+ spin_lock(&OCFS2_I(inode)->ip_lock);
+ OCFS2_I(inode)->ip_clusters = le32_to_cpu(di->i_clusters);
+ spin_unlock(&OCFS2_I(inode)->ip_lock);
+}
+
+static int ocfs2_append_rec_to_path(struct inode *inode, handle_t *handle,
+ struct ocfs2_extent_rec *insert_rec,
+ struct ocfs2_path *right_path,
+ struct ocfs2_path **ret_left_path)
+{
+ int ret, i, next_free;
+ struct buffer_head *bh;
+ struct ocfs2_extent_list *el;
+ struct ocfs2_path *left_path = NULL;
+
+ *ret_left_path = NULL;
+
+ /*
+ * If our appending insert is at the leftmost edge of a leaf,
+ * then we might need to update the rightmost records of the
+ * neighboring path.
+ */
+ el = path_leaf_el(right_path);
+ next_free = le16_to_cpu(el->l_next_free_rec);
+ if (next_free == 0 ||
+ (next_free == 1 && ocfs2_is_empty_extent(&el->l_recs[0]))) {
+ u32 left_cpos;
+
+ ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, right_path,
+ &left_cpos);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ mlog(0, "Append may need a left path update. cpos: %u, "
+ "left_cpos: %u\n", le32_to_cpu(insert_rec->e_cpos),
+ left_cpos);
+
+ /*
+ * No need to worry if the append is already in the
+ * leftmost leaf.
+ */
+ if (left_cpos) {
+ left_path = ocfs2_new_path(path_root_bh(right_path),
+ path_root_el(right_path));
+ if (!left_path) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_find_path(inode, left_path, left_cpos);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * ocfs2_insert_path() will pass the left_path to the
+ * journal for us.
+ */
+ }
+ }
+
+ ret = ocfs2_journal_access_path(inode, handle, right_path);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ el = path_root_el(right_path);
+ bh = path_root_bh(right_path);
+ i = 0;
+ while (1) {
+ next_free = le16_to_cpu(el->l_next_free_rec);
+ if (next_free == 0) {
+ ocfs2_error(inode->i_sb,
+ "Dinode %llu has a bad extent list",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno);
+ ret = -EIO;
+ goto out;
+ }
+
+ el->l_recs[next_free - 1].e_clusters = insert_rec->e_cpos;
+ le32_add_cpu(&el->l_recs[next_free - 1].e_clusters,
+ le32_to_cpu(insert_rec->e_clusters));
+ le32_add_cpu(&el->l_recs[next_free - 1].e_clusters,
+ -le32_to_cpu(el->l_recs[next_free - 1].e_cpos));
+
+ ret = ocfs2_journal_dirty(handle, bh);
+ if (ret)
+ mlog_errno(ret);
+
+ if (++i >= right_path->p_tree_depth)
+ break;
+
+ bh = right_path->p_node[i].bh;
+ el = right_path->p_node[i].el;
+ }
+
+ *ret_left_path = left_path;
+ ret = 0;
+out:
+ if (ret != 0)
+ ocfs2_free_path(left_path);
+
+ return ret;
+}
+
+/*
+ * This function only does inserts on an allocation b-tree. For dinode
+ * lists, ocfs2_insert_at_leaf() is called directly.
+ *
+ * right_path is the path we want to do the actual insert
+ * in. left_path should only be passed in if we need to update that
+ * portion of the tree after an edge insert.
+ */
+static int ocfs2_insert_path(struct inode *inode,
+ handle_t *handle,
+ struct ocfs2_path *left_path,
+ struct ocfs2_path *right_path,
+ struct ocfs2_extent_rec *insert_rec,
+ struct ocfs2_insert_type *insert)
+{
+ int ret, subtree_index;
+ struct buffer_head *leaf_bh = path_leaf_bh(right_path);
+ struct ocfs2_extent_list *el;
+
+ /*
+ * Pass both paths to the journal. The majority of inserts
+ * will be touching all components anyway.
+ */
+ ret = ocfs2_journal_access_path(inode, handle, right_path);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ if (left_path) {
+ int credits = handle->h_buffer_credits;
+
+ /*
+ * There's a chance that left_path got passed back to
+ * us without being accounted for in the
+ * journal. Extend our transaction here to be sure we
+ * can change those blocks.
+ */
+ credits += left_path->p_tree_depth;
+
+ ret = ocfs2_extend_trans(handle, credits);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_journal_access_path(inode, handle, left_path);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+ }
+
+ el = path_leaf_el(right_path);
+
+ ocfs2_insert_at_leaf(insert_rec, el, insert, inode);
+ ret = ocfs2_journal_dirty(handle, leaf_bh);
+ if (ret)
+ mlog_errno(ret);
+
+ if (left_path) {
+ /*
+ * The rotate code has indicated that we need to fix
+ * up portions of the tree after the insert.
+ *
+ * XXX: Should we extend the transaction here?
+ */
+ subtree_index = ocfs2_find_subtree_root(inode, left_path,
+ right_path);
+ ocfs2_complete_edge_insert(inode, handle, left_path,
+ right_path, subtree_index);
+ }
+
+ ret = 0;
+out:
+ return ret;
+}
+
+static int ocfs2_do_insert_extent(struct inode *inode,
+ handle_t *handle,
+ struct buffer_head *di_bh,
+ struct ocfs2_extent_rec *insert_rec,
+ struct ocfs2_insert_type *type)
+{
+ int ret, rotate = 0;
+ u32 cpos;
+ struct ocfs2_path *right_path = NULL;
+ struct ocfs2_path *left_path = NULL;
+ struct ocfs2_dinode *di;
+ struct ocfs2_extent_list *el;
+
+ di = (struct ocfs2_dinode *) di_bh->b_data;
+ el = &di->id2.i_list;
+
+ ret = ocfs2_journal_access(handle, inode, di_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ if (le16_to_cpu(el->l_tree_depth) == 0) {
+ ocfs2_insert_at_leaf(insert_rec, el, type, inode);
+ goto out_update_clusters;
+ }
+
+ right_path = ocfs2_new_inode_path(di_bh);
+ if (!right_path) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * Determine the path to start with. Rotations need the
+ * rightmost path, everything else can go directly to the
+ * target leaf.
+ */
+ cpos = le32_to_cpu(insert_rec->e_cpos);
+ if (type->ins_appending == APPEND_NONE &&
+ type->ins_contig == CONTIG_NONE) {
+ rotate = 1;
+ cpos = UINT_MAX;
+ }
+
+ ret = ocfs2_find_path(inode, right_path, cpos);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * Rotations and appends need special treatment - they modify
+ * parts of the tree's above them.
+ *
+ * Both might pass back a path immediate to the left of the
+ * one being inserted to. This will be cause
+ * ocfs2_insert_path() to modify the rightmost records of
+ * left_path to account for an edge insert.
+ *
+ * XXX: When modifying this code, keep in mind that an insert
+ * can wind up skipping both of these two special cases...
+ */
+ if (rotate) {
+ ret = ocfs2_rotate_tree_right(inode, handle,
+ le32_to_cpu(insert_rec->e_cpos),
+ right_path, &left_path);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+ } else if (type->ins_appending == APPEND_TAIL
+ && type->ins_contig != CONTIG_LEFT) {
+ ret = ocfs2_append_rec_to_path(inode, handle, insert_rec,
+ right_path, &left_path);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+ }
+
+ ret = ocfs2_insert_path(inode, handle, left_path, right_path,
+ insert_rec, type);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+out_update_clusters:
+ ocfs2_update_dinode_clusters(inode, di,
+ le32_to_cpu(insert_rec->e_clusters));
+
+ ret = ocfs2_journal_dirty(handle, di_bh);
+ if (ret)
+ mlog_errno(ret);
+
+out:
+ ocfs2_free_path(left_path);
+ ocfs2_free_path(right_path);
+
+ return ret;
+}
+
+static void ocfs2_figure_contig_type(struct inode *inode,
+ struct ocfs2_insert_type *insert,
+ struct ocfs2_extent_list *el,
+ struct ocfs2_extent_rec *insert_rec)
+{
+ int i;
+ enum ocfs2_contig_type contig_type = CONTIG_NONE;
+
+ for(i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
+ contig_type = ocfs2_extent_contig(inode, &el->l_recs[i],
+ insert_rec);
+ if (contig_type != CONTIG_NONE) {
+ insert->ins_contig_index = i;
+ break;
+ }
+ }
+ insert->ins_contig = contig_type;
+}
+
+/*
+ * This should only be called against the righmost leaf extent list.
+ *
+ * ocfs2_figure_appending_type() will figure out whether we'll have to
+ * insert at the tail of the rightmost leaf.
+ *
+ * This should also work against the dinode list for tree's with 0
+ * depth. If we consider the dinode list to be the rightmost leaf node
+ * then the logic here makes sense.
+ */
+static void ocfs2_figure_appending_type(struct ocfs2_insert_type *insert,
+ struct ocfs2_extent_list *el,
+ struct ocfs2_extent_rec *insert_rec)
+{
+ int i;
+ u32 cpos = le32_to_cpu(insert_rec->e_cpos);
+ struct ocfs2_extent_rec *rec;
+
+ insert->ins_appending = APPEND_NONE;
+
+ BUG_ON(el->l_tree_depth);
+
+ if (!el->l_next_free_rec)
+ goto set_tail_append;
+
+ if (ocfs2_is_empty_extent(&el->l_recs[0])) {
+ /* Were all records empty? */
+ if (le16_to_cpu(el->l_next_free_rec) == 1)
+ goto set_tail_append;
+ }
+
+ i = le16_to_cpu(el->l_next_free_rec) - 1;
+ rec = &el->l_recs[i];
+
+ if (cpos >= (le32_to_cpu(rec->e_cpos) + le32_to_cpu(rec->e_clusters)))
+ goto set_tail_append;
+
+ return;
+
+set_tail_append:
+ insert->ins_appending = APPEND_TAIL;
+}
+
+/*
+ * Helper function called at the begining of an insert.
+ *
+ * This computes a few things that are commonly used in the process of
+ * inserting into the btree:
+ * - Whether the new extent is contiguous with an existing one.
+ * - The current tree depth.
+ * - Whether the insert is an appending one.
+ * - The total # of free records in the tree.
+ *
+ * All of the information is stored on the ocfs2_insert_type
+ * structure.
+ */
+static int ocfs2_figure_insert_type(struct inode *inode,
+ struct buffer_head *di_bh,
+ struct buffer_head **last_eb_bh,
+ struct ocfs2_extent_rec *insert_rec,
+ struct ocfs2_insert_type *insert)
+{
+ int ret;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+ struct ocfs2_extent_block *eb;
+ struct ocfs2_extent_list *el;
+ struct ocfs2_path *path = NULL;
+ struct buffer_head *bh = NULL;
+
+ el = &di->id2.i_list;
+ insert->ins_tree_depth = le16_to_cpu(el->l_tree_depth);
+
+ if (el->l_tree_depth) {
+ /*
+ * If we have tree depth, we read in the
+ * rightmost extent block ahead of time as
+ * ocfs2_figure_insert_type() and ocfs2_add_branch()
+ * may want it later.
+ */
+ ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
+ le64_to_cpu(di->i_last_eb_blk), &bh,
+ OCFS2_BH_CACHED, inode);
+ if (ret) {
+ mlog_exit(ret);
+ goto out;
+ }
eb = (struct ocfs2_extent_block *) bh->b_data;
- if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
- OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
- status = -EIO;
- goto bail;
- }
el = &eb->h_list;
+ }
- if (le16_to_cpu(el->l_next_free_rec) <
- le16_to_cpu(el->l_count)) {
- if (lowest_bh)
- brelse(lowest_bh);
- lowest_bh = bh;
- get_bh(lowest_bh);
- }
+ /*
+ * Unless we have a contiguous insert, we'll need to know if
+ * there is room left in our allocation tree for another
+ * extent record.
+ *
+ * XXX: This test is simplistic, we can search for empty
+ * extent records too.
+ */
+ insert->ins_free_records = le16_to_cpu(el->l_count) -
+ le16_to_cpu(el->l_next_free_rec);
+
+ if (!insert->ins_tree_depth) {
+ ocfs2_figure_contig_type(inode, insert, el, insert_rec);
+ ocfs2_figure_appending_type(insert, el, insert_rec);
+ return 0;
}
- /* If we didn't find one and the fe doesn't have any room,
- * then return '1' */
- if (!lowest_bh
- && (fe->id2.i_list.l_next_free_rec == fe->id2.i_list.l_count))
- status = 1;
+ path = ocfs2_new_inode_path(di_bh);
+ if (!path) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
- *target_bh = lowest_bh;
-bail:
- if (bh)
- brelse(bh);
+ /*
+ * In the case that we're inserting past what the tree
+ * currently accounts for, ocfs2_find_path() will return for
+ * us the rightmost tree path. This is accounted for below in
+ * the appending code.
+ */
+ ret = ocfs2_find_path(inode, path, le32_to_cpu(insert_rec->e_cpos));
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
- mlog_exit(status);
- return status;
+ el = path_leaf_el(path);
+
+ /*
+ * Now that we have the path, there's two things we want to determine:
+ * 1) Contiguousness (also set contig_index if this is so)
+ *
+ * 2) Are we doing an append? We can trivially break this up
+ * into two types of appends: simple record append, or a
+ * rotate inside the tail leaf.
+ */
+ ocfs2_figure_contig_type(inode, insert, el, insert_rec);
+
+ /*
+ * The insert code isn't quite ready to deal with all cases of
+ * left contiguousness. Specifically, if it's an insert into
+ * the 1st record in a leaf, it will require the adjustment of
+ * e_clusters on the last record of the path directly to it's
+ * left. For now, just catch that case and fool the layers
+ * above us. This works just fine for tree_depth == 0, which
+ * is why we allow that above.
+ */
+ if (insert->ins_contig == CONTIG_LEFT &&
+ insert->ins_contig_index == 0)
+ insert->ins_contig = CONTIG_NONE;
+
+ /*
+ * Ok, so we can simply compare against last_eb to figure out
+ * whether the path doesn't exist. This will only happen in
+ * the case that we're doing a tail append, so maybe we can
+ * take advantage of that information somehow.
+ */
+ if (le64_to_cpu(di->i_last_eb_blk) == path_leaf_bh(path)->b_blocknr) {
+ /*
+ * Ok, ocfs2_find_path() returned us the rightmost
+ * tree path. This might be an appending insert. There are
+ * two cases:
+ * 1) We're doing a true append at the tail:
+ * -This might even be off the end of the leaf
+ * 2) We're "appending" by rotating in the tail
+ */
+ ocfs2_figure_appending_type(insert, el, insert_rec);
+ }
+
+out:
+ ocfs2_free_path(path);
+
+ if (ret == 0)
+ *last_eb_bh = bh;
+ else
+ brelse(bh);
+ return ret;
}
-/* the caller needs to update fe->i_clusters */
+/*
+ * Insert an extent into an inode btree.
+ *
+ * The caller needs to update fe->i_clusters
+ */
int ocfs2_insert_extent(struct ocfs2_super *osb,
handle_t *handle,
struct inode *inode,
struct buffer_head *fe_bh,
+ u32 cpos,
u64 start_blk,
u32 new_clusters,
struct ocfs2_alloc_context *meta_ac)
{
- int status, i, shift;
+ int status, shift;
struct buffer_head *last_eb_bh = NULL;
struct buffer_head *bh = NULL;
- struct ocfs2_dinode *fe;
- struct ocfs2_extent_block *eb;
- struct ocfs2_extent_list *el;
-
- mlog_entry_void();
-
- mlog(0, "add %u clusters starting at block %llu to inode %llu\n",
- new_clusters, (unsigned long long)start_blk,
- (unsigned long long)OCFS2_I(inode)->ip_blkno);
-
- fe = (struct ocfs2_dinode *) fe_bh->b_data;
- el = &fe->id2.i_list;
-
- if (el->l_tree_depth) {
- /* jump to end of tree */
- status = ocfs2_read_block(osb, le64_to_cpu(fe->i_last_eb_blk),
- &last_eb_bh, OCFS2_BH_CACHED, inode);
- if (status < 0) {
- mlog_exit(status);
- goto bail;
- }
- eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
- el = &eb->h_list;
+ struct ocfs2_insert_type insert = {0, };
+ struct ocfs2_extent_rec rec;
+
+ mlog(0, "add %u clusters at position %u to inode %llu\n",
+ new_clusters, cpos, (unsigned long long)OCFS2_I(inode)->ip_blkno);
+
+ mlog_bug_on_msg(!ocfs2_sparse_alloc(osb) &&
+ (OCFS2_I(inode)->ip_clusters != cpos),
+ "Device %s, asking for sparse allocation: inode %llu, "
+ "cpos %u, clusters %u\n",
+ osb->dev_str,
+ (unsigned long long)OCFS2_I(inode)->ip_blkno, cpos,
+ OCFS2_I(inode)->ip_clusters);
+
+ rec.e_cpos = cpu_to_le32(cpos);
+ rec.e_blkno = cpu_to_le64(start_blk);
+ rec.e_clusters = cpu_to_le32(new_clusters);
+
+ status = ocfs2_figure_insert_type(inode, fe_bh, &last_eb_bh, &rec,
+ &insert);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
}
- /* Can we allocate without adding/shifting tree bits? */
- i = le16_to_cpu(el->l_next_free_rec) - 1;
- if (le16_to_cpu(el->l_next_free_rec) == 0
- || (le16_to_cpu(el->l_next_free_rec) < le16_to_cpu(el->l_count))
- || le32_to_cpu(el->l_recs[i].e_clusters) == 0
- || ocfs2_extent_contig(inode, &el->l_recs[i], start_blk))
- goto out_add;
+ mlog(0, "Insert.appending: %u, Insert.Contig: %u, "
+ "Insert.contig_index: %d, Insert.free_records: %d, "
+ "Insert.tree_depth: %d\n",
+ insert.ins_appending, insert.ins_contig, insert.ins_contig_index,
+ insert.ins_free_records, insert.ins_tree_depth);
- mlog(0, "ocfs2_allocate_extent: couldn't do a simple add, traversing "
- "tree now.\n");
+ /*
+ * Avoid growing the tree unless we're out of records and the
+ * insert type requres one.
+ */
+ if (insert.ins_contig != CONTIG_NONE || insert.ins_free_records)
+ goto out_add;
shift = ocfs2_find_branch_target(osb, inode, fe_bh, &bh);
if (shift < 0) {
* and didn't find room for any more extents - we need to add
* another tree level */
if (shift) {
- /* if we hit a leaf, we'd better be empty :) */
- BUG_ON(le16_to_cpu(el->l_next_free_rec) !=
- le16_to_cpu(el->l_count));
BUG_ON(bh);
- mlog(0, "ocfs2_allocate_extent: need to shift tree depth "
- "(current = %u)\n",
- le16_to_cpu(fe->id2.i_list.l_tree_depth));
+ mlog(0, "need to shift tree depth "
+ "(current = %d)\n", insert.ins_tree_depth);
/* ocfs2_shift_tree_depth will return us a buffer with
* the new extent block (so we can pass that to
mlog_errno(status);
goto bail;
}
+ insert.ins_tree_depth++;
/* Special case: we have room now if we shifted from
* tree_depth 0 */
- if (fe->id2.i_list.l_tree_depth == cpu_to_le16(1))
+ if (insert.ins_tree_depth == 1)
goto out_add;
}
/* call ocfs2_add_branch to add the final part of the tree with
* the new data. */
- mlog(0, "ocfs2_allocate_extent: add branch. bh = %p\n", bh);
+ mlog(0, "add branch. bh = %p\n", bh);
status = ocfs2_add_branch(osb, handle, inode, fe_bh, bh, last_eb_bh,
meta_ac);
if (status < 0) {
}
out_add:
- /* Finally, we can add clusters. */
- status = ocfs2_do_insert_extent(osb, handle, inode, fe_bh,
- start_blk, new_clusters);
+ /* Finally, we can add clusters. This might rotate the tree for us. */
+ status = ocfs2_do_insert_extent(inode, handle, fe_bh, &rec, &insert);
if (status < 0)
mlog_errno(status);
* block will be deleted, and if it will, what the new last extent
* block will be so we can update his h_next_leaf_blk field, as well
* as the dinodes i_last_eb_blk */
-static int ocfs2_find_new_last_ext_blk(struct ocfs2_super *osb,
- struct inode *inode,
- struct ocfs2_dinode *fe,
+static int ocfs2_find_new_last_ext_blk(struct inode *inode,
u32 new_i_clusters,
- struct buffer_head *old_last_eb,
+ struct ocfs2_path *path,
struct buffer_head **new_last_eb)
{
- int i, status = 0;
- u64 block = 0;
+ int ret = 0;
+ u32 cpos;
struct ocfs2_extent_block *eb;
struct ocfs2_extent_list *el;
struct buffer_head *bh = NULL;
*new_last_eb = NULL;
- if (!OCFS2_IS_VALID_DINODE(fe)) {
- OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
- status = -EIO;
- goto bail;
- }
-
/* we have no tree, so of course, no last_eb. */
- if (!fe->id2.i_list.l_tree_depth)
- goto bail;
+ if (!path->p_tree_depth)
+ goto out;
/* trunc to zero special case - this makes tree_depth = 0
* regardless of what it is. */
if (!new_i_clusters)
- goto bail;
+ goto out;
- eb = (struct ocfs2_extent_block *) old_last_eb->b_data;
- el = &(eb->h_list);
+ el = path_leaf_el(path);
BUG_ON(!el->l_next_free_rec);
/* Make sure that this guy will actually be empty after we
* clear away the data. */
- if (le32_to_cpu(el->l_recs[0].e_cpos) < new_i_clusters)
- goto bail;
+ if (ocfs2_is_empty_extent(&el->l_recs[0])) {
+ if (le16_to_cpu(el->l_next_free_rec) > 1 &&
+ le32_to_cpu(el->l_recs[1].e_cpos) < new_i_clusters)
+ goto out;
+ } else if (le32_to_cpu(el->l_recs[0].e_cpos) < new_i_clusters)
+ goto out;
- /* Ok, at this point, we know that last_eb will definitely
- * change, so lets traverse the tree and find the second to
- * last extent block. */
- el = &(fe->id2.i_list);
- /* go down the tree, */
- do {
- for(i = (le16_to_cpu(el->l_next_free_rec) - 1); i >= 0; i--) {
- if (le32_to_cpu(el->l_recs[i].e_cpos) <
- new_i_clusters) {
- block = le64_to_cpu(el->l_recs[i].e_blkno);
- break;
- }
- }
- BUG_ON(i < 0);
+ ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, path, &cpos);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
- if (bh) {
- brelse(bh);
- bh = NULL;
- }
+ ret = ocfs2_find_leaf(inode, path_root_el(path), cpos, &bh);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
- status = ocfs2_read_block(osb, block, &bh, OCFS2_BH_CACHED,
- inode);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
- eb = (struct ocfs2_extent_block *) bh->b_data;
- el = &eb->h_list;
- if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
- OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
- status = -EIO;
- goto bail;
- }
- } while (el->l_tree_depth);
+ eb = (struct ocfs2_extent_block *) bh->b_data;
+ el = &eb->h_list;
+ if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
+ OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
+ ret = -EROFS;
+ goto out;
+ }
*new_last_eb = bh;
get_bh(*new_last_eb);
- mlog(0, "returning block %llu\n",
- (unsigned long long)le64_to_cpu(eb->h_blkno));
-bail:
- if (bh)
- brelse(bh);
+ mlog(0, "returning block %llu, (cpos: %u)\n",
+ (unsigned long long)le64_to_cpu(eb->h_blkno), cpos);
+out:
+ brelse(bh);
- return status;
+ return ret;
}
static int ocfs2_do_truncate(struct ocfs2_super *osb,
unsigned int clusters_to_del,
struct inode *inode,
struct buffer_head *fe_bh,
- struct buffer_head *old_last_eb_bh,
handle_t *handle,
- struct ocfs2_truncate_context *tc)
+ struct ocfs2_truncate_context *tc,
+ struct ocfs2_path *path)
{
- int status, i, depth;
+ int status, i, index;
struct ocfs2_dinode *fe;
struct ocfs2_extent_block *eb;
struct ocfs2_extent_block *last_eb = NULL;
struct ocfs2_extent_list *el;
struct buffer_head *eb_bh = NULL;
struct buffer_head *last_eb_bh = NULL;
- u64 next_eb = 0;
u64 delete_blk = 0;
fe = (struct ocfs2_dinode *) fe_bh->b_data;
- status = ocfs2_find_new_last_ext_blk(osb,
- inode,
- fe,
+ status = ocfs2_find_new_last_ext_blk(inode,
le32_to_cpu(fe->i_clusters) -
- clusters_to_del,
- old_last_eb_bh,
- &last_eb_bh);
+ clusters_to_del,
+ path, &last_eb_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
- if (last_eb_bh)
+
+ /*
+ * Each component will be touched, so we might as well journal
+ * here to avoid having to handle errors later.
+ */
+ for (i = 0; i < path_num_items(path); i++) {
+ status = ocfs2_journal_access(handle, inode,
+ path->p_node[i].bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+ if (last_eb_bh) {
+ status = ocfs2_journal_access(handle, inode, last_eb_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
last_eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
+ }
- status = ocfs2_journal_access(handle, inode, fe_bh,
- OCFS2_JOURNAL_ACCESS_WRITE);
- if (status < 0) {
- mlog_errno(status);
+ el = &(fe->id2.i_list);
+
+ /*
+ * Lower levels depend on this never happening, but it's best
+ * to check it up here before changing the tree.
+ */
+ if (el->l_tree_depth && ocfs2_is_empty_extent(&el->l_recs[0])) {
+ ocfs2_error(inode->i_sb,
+ "Inode %lu has an empty extent record, depth %u\n",
+ inode->i_ino, le16_to_cpu(el->l_tree_depth));
goto bail;
}
- el = &(fe->id2.i_list);
spin_lock(&OCFS2_I(inode)->ip_lock);
OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters) -
clusters_to_del;
spin_unlock(&OCFS2_I(inode)->ip_lock);
le32_add_cpu(&fe->i_clusters, -clusters_to_del);
- fe->i_mtime = cpu_to_le64(CURRENT_TIME.tv_sec);
- fe->i_mtime_nsec = cpu_to_le32(CURRENT_TIME.tv_nsec);
i = le16_to_cpu(el->l_next_free_rec) - 1;
/* tree depth zero, we can just delete the clusters, otherwise
* we need to record the offset of the next level extent block
* as we may overwrite it. */
- if (!el->l_tree_depth)
+ if (!el->l_tree_depth) {
delete_blk = le64_to_cpu(el->l_recs[i].e_blkno)
+ ocfs2_clusters_to_blocks(osb->sb,
le32_to_cpu(el->l_recs[i].e_clusters));
- else
- next_eb = le64_to_cpu(el->l_recs[i].e_blkno);
- if (!el->l_recs[i].e_clusters) {
- /* if we deleted the whole extent record, then clear
- * out the other fields and update the extent
- * list. For depth > 0 trees, we've already recorded
- * the extent block in 'next_eb' */
- el->l_recs[i].e_cpos = 0;
- el->l_recs[i].e_blkno = 0;
- BUG_ON(!el->l_next_free_rec);
- le16_add_cpu(&el->l_next_free_rec, -1);
+ if (!el->l_recs[i].e_clusters) {
+ /* if we deleted the whole extent record, then clear
+ * out the other fields and update the extent
+ * list.
+ */
+ el->l_recs[i].e_cpos = 0;
+ el->l_recs[i].e_blkno = 0;
+ BUG_ON(!el->l_next_free_rec);
+ le16_add_cpu(&el->l_next_free_rec, -1);
+
+ /*
+ * The leftmost record might be an empty extent -
+ * delete it here too.
+ */
+ if (i == 1 && ocfs2_is_empty_extent(&el->l_recs[0])) {
+ el->l_recs[0].e_cpos = 0;
+ el->l_recs[0].e_blkno = 0;
+ el->l_next_free_rec = 0;
+ }
+ }
}
- depth = le16_to_cpu(el->l_tree_depth);
- if (!fe->i_clusters) {
+ if (le32_to_cpu(fe->i_clusters) == 0) {
/* trunc to zero is a special case. */
el->l_tree_depth = 0;
fe->i_last_eb_blk = 0;
/* If there will be a new last extent block, then by
* definition, there cannot be any leaves to the right of
* him. */
- status = ocfs2_journal_access(handle, inode, last_eb_bh,
- OCFS2_JOURNAL_ACCESS_WRITE);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
last_eb->h_next_leaf_blk = 0;
status = ocfs2_journal_dirty(handle, last_eb_bh);
if (status < 0) {
}
}
+ index = 1;
/* if our tree depth > 0, update all the tree blocks below us. */
- while (depth) {
- mlog(0, "traveling tree (depth = %d, next_eb = %llu)\n",
- depth, (unsigned long long)next_eb);
- status = ocfs2_read_block(osb, next_eb, &eb_bh,
- OCFS2_BH_CACHED, inode);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
+ while (index <= path->p_tree_depth) {
+ eb_bh = path->p_node[index].bh;
eb = (struct ocfs2_extent_block *)eb_bh->b_data;
- if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
- OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
- status = -EIO;
- goto bail;
- }
- el = &(eb->h_list);
+ el = path->p_node[index].el;
- status = ocfs2_journal_access(handle, inode, eb_bh,
- OCFS2_JOURNAL_ACCESS_WRITE);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
+ mlog(0, "traveling tree (index = %d, extent block: %llu)\n",
+ index, (unsigned long long)eb_bh->b_blocknr);
BUG_ON(le16_to_cpu(el->l_next_free_rec) == 0);
- BUG_ON(depth != (le16_to_cpu(el->l_tree_depth) + 1));
+ if (index !=
+ (path->p_tree_depth - le16_to_cpu(el->l_tree_depth))) {
+ ocfs2_error(inode->i_sb,
+ "Inode %lu has invalid ext. block %llu\n",
+ inode->i_ino,
+ (unsigned long long)eb_bh->b_blocknr);
+ goto bail;
+ }
i = le16_to_cpu(el->l_next_free_rec) - 1;
BUG_ON(le32_to_cpu(el->l_recs[i].e_clusters) < clusters_to_del);
le32_add_cpu(&el->l_recs[i].e_clusters, -clusters_to_del);
- next_eb = le64_to_cpu(el->l_recs[i].e_blkno);
/* bottom-most block requires us to delete data.*/
if (!el->l_tree_depth)
delete_blk = le64_to_cpu(el->l_recs[i].e_blkno)
BUG_ON(!el->l_next_free_rec);
le16_add_cpu(&el->l_next_free_rec, -1);
}
+ if (i == 1 && ocfs2_is_empty_extent(&el->l_recs[0])) {
+ el->l_recs[0].e_cpos = 0;
+ el->l_recs[0].e_blkno = 0;
+ el->l_next_free_rec = 0;
+ }
+
mlog(0, "extent block %llu, after: record %d: "
"(%u, %u, %llu), next = %u\n",
(unsigned long long)le64_to_cpu(eb->h_blkno), i,
BUG_ON(el->l_recs[0].e_clusters);
BUG_ON(el->l_recs[0].e_cpos);
BUG_ON(el->l_recs[0].e_blkno);
+
+ /*
+ * We need to remove this extent block from
+ * the list above it.
+ *
+ * Since we've passed it already in this loop,
+ * no need to worry about journaling.
+ */
+ el = path->p_node[index - 1].el;
+ i = le16_to_cpu(el->l_next_free_rec) - 1;
+ BUG_ON(i < 0);
+ el->l_recs[i].e_cpos = 0;
+ el->l_recs[i].e_clusters = 0;
+ el->l_recs[i].e_blkno = 0;
+ le16_add_cpu(&el->l_next_free_rec, -1);
+
if (eb->h_suballoc_slot == 0) {
/*
* This code only understands how to
}
}
}
- brelse(eb_bh);
- eb_bh = NULL;
- depth--;
+ index++;
}
BUG_ON(!delete_blk);
}
status = 0;
bail:
- if (!status)
- ocfs2_extent_map_trunc(inode, le32_to_cpu(fe->i_clusters));
- else
- ocfs2_extent_map_drop(inode, 0);
+
mlog_exit(status);
return status;
}
struct ocfs2_truncate_context *tc)
{
int status, i, credits, tl_sem = 0;
- u32 clusters_to_del, target_i_clusters;
- u64 last_eb = 0;
- struct ocfs2_dinode *fe;
- struct ocfs2_extent_block *eb;
+ u32 clusters_to_del, new_highest_cpos, range;
struct ocfs2_extent_list *el;
- struct buffer_head *last_eb_bh;
handle_t *handle = NULL;
struct inode *tl_inode = osb->osb_tl_inode;
+ struct ocfs2_path *path = NULL;
mlog_entry_void();
down_write(&OCFS2_I(inode)->ip_alloc_sem);
- target_i_clusters = ocfs2_clusters_for_bytes(osb->sb,
+ new_highest_cpos = ocfs2_clusters_for_bytes(osb->sb,
i_size_read(inode));
- last_eb_bh = tc->tc_last_eb_bh;
- tc->tc_last_eb_bh = NULL;
-
- fe = (struct ocfs2_dinode *) fe_bh->b_data;
-
- if (fe->id2.i_list.l_tree_depth) {
- eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
- el = &eb->h_list;
- } else
- el = &fe->id2.i_list;
- last_eb = le64_to_cpu(fe->i_last_eb_blk);
+ path = ocfs2_new_inode_path(fe_bh);
+ if (!path) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
start:
- mlog(0, "ocfs2_commit_truncate: fe->i_clusters = %u, "
- "last_eb = %llu, fe->i_last_eb_blk = %llu, "
- "fe->id2.i_list.l_tree_depth = %u last_eb_bh = %p\n",
- le32_to_cpu(fe->i_clusters), (unsigned long long)last_eb,
- (unsigned long long)le64_to_cpu(fe->i_last_eb_blk),
- le16_to_cpu(fe->id2.i_list.l_tree_depth), last_eb_bh);
-
- if (last_eb != le64_to_cpu(fe->i_last_eb_blk)) {
- mlog(0, "last_eb changed!\n");
- BUG_ON(!fe->id2.i_list.l_tree_depth);
- last_eb = le64_to_cpu(fe->i_last_eb_blk);
- /* i_last_eb_blk may have changed, read it if
- * necessary. We don't have to worry about the
- * truncate to zero case here (where there becomes no
- * last_eb) because we never loop back after our work
- * is done. */
- if (last_eb_bh) {
- brelse(last_eb_bh);
- last_eb_bh = NULL;
- }
-
- status = ocfs2_read_block(osb, last_eb,
- &last_eb_bh, OCFS2_BH_CACHED,
- inode);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
- eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
- if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
- OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
- status = -EIO;
- goto bail;
- }
- el = &(eb->h_list);
+ /*
+ * Truncate always works against the rightmost tree branch.
+ */
+ status = ocfs2_find_path(inode, path, UINT_MAX);
+ if (status) {
+ mlog_errno(status);
+ goto bail;
}
- /* by now, el will point to the extent list on the bottom most
- * portion of this tree. */
+ mlog(0, "inode->ip_clusters = %u, tree_depth = %u\n",
+ OCFS2_I(inode)->ip_clusters, path->p_tree_depth);
+
+ /*
+ * By now, el will point to the extent list on the bottom most
+ * portion of this tree. Only the tail record is considered in
+ * each pass.
+ *
+ * We handle the following cases, in order:
+ * - empty extent: delete the remaining branch
+ * - remove the entire record
+ * - remove a partial record
+ * - no record needs to be removed (truncate has completed)
+ */
+ el = path_leaf_el(path);
i = le16_to_cpu(el->l_next_free_rec) - 1;
- if (le32_to_cpu(el->l_recs[i].e_cpos) >= target_i_clusters)
+ range = le32_to_cpu(el->l_recs[i].e_cpos) +
+ le32_to_cpu(el->l_recs[i].e_clusters);
+ if (i == 0 && ocfs2_is_empty_extent(&el->l_recs[i])) {
+ clusters_to_del = 0;
+ } else if (le32_to_cpu(el->l_recs[i].e_cpos) >= new_highest_cpos) {
clusters_to_del = le32_to_cpu(el->l_recs[i].e_clusters);
- else
+ } else if (range > new_highest_cpos) {
clusters_to_del = (le32_to_cpu(el->l_recs[i].e_clusters) +
le32_to_cpu(el->l_recs[i].e_cpos)) -
- target_i_clusters;
+ new_highest_cpos;
+ } else {
+ status = 0;
+ goto bail;
+ }
- mlog(0, "clusters_to_del = %u in this pass\n", clusters_to_del);
+ mlog(0, "clusters_to_del = %u in this pass, tail blk=%llu\n",
+ clusters_to_del, (unsigned long long)path_leaf_bh(path)->b_blocknr);
+
+ BUG_ON(clusters_to_del == 0);
mutex_lock(&tl_inode->i_mutex);
tl_sem = 1;
}
credits = ocfs2_calc_tree_trunc_credits(osb->sb, clusters_to_del,
- fe, el);
+ (struct ocfs2_dinode *)fe_bh->b_data,
+ el);
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
goto bail;
}
- inode->i_ctime = inode->i_mtime = CURRENT_TIME;
- status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
- if (status < 0)
- mlog_errno(status);
-
- status = ocfs2_do_truncate(osb, clusters_to_del, inode, fe_bh,
- last_eb_bh, handle, tc);
+ status = ocfs2_do_truncate(osb, clusters_to_del, inode, fe_bh, handle,
+ tc, path);
if (status < 0) {
mlog_errno(status);
goto bail;
ocfs2_commit_trans(osb, handle);
handle = NULL;
- BUG_ON(le32_to_cpu(fe->i_clusters) < target_i_clusters);
- if (le32_to_cpu(fe->i_clusters) > target_i_clusters)
+ ocfs2_reinit_path(path, 1);
+
+ /*
+ * Only loop if we still have allocation.
+ */
+ if (OCFS2_I(inode)->ip_clusters)
goto start;
bail:
up_write(&OCFS2_I(inode)->ip_alloc_sem);
if (handle)
ocfs2_commit_trans(osb, handle);
- if (last_eb_bh)
- brelse(last_eb_bh);
+ ocfs2_free_path(path);
/* This will drop the ext_alloc cluster lock for us */
ocfs2_free_truncate_context(tc);
return status;
}
-
/*
* Expects the inode to already be locked. This will figure out which
* inodes need to be locked and will put them on the returned truncate
struct buffer_head *fe_bh,
struct ocfs2_truncate_context **tc)
{
- int status, metadata_delete;
+ int status, metadata_delete, i;
unsigned int new_i_clusters;
struct ocfs2_dinode *fe;
struct ocfs2_extent_block *eb;
"%llu\n", fe->i_clusters, new_i_clusters,
(unsigned long long)fe->i_size);
- if (le32_to_cpu(fe->i_clusters) <= new_i_clusters) {
+ if (!ocfs2_sparse_alloc(osb) &&
+ le32_to_cpu(fe->i_clusters) <= new_i_clusters) {
ocfs2_error(inode->i_sb, "Dinode %llu has cluster count "
"%u and size %llu whereas struct inode has "
"cluster count %u and size %llu which caused an "
goto bail;
}
el = &(eb->h_list);
- if (le32_to_cpu(el->l_recs[0].e_cpos) >= new_i_clusters)
+
+ i = 0;
+ if (ocfs2_is_empty_extent(&el->l_recs[0]))
+ i = 1;
+ /*
+ * XXX: Should we check that next_free_rec contains
+ * the extent?
+ */
+ if (le32_to_cpu(el->l_recs[i].e_cpos) >= new_i_clusters)
metadata_delete = 1;
}
projects / linux-2.6 / commitdiff