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Subject[PATCH 24/39] ocfs2: Make ocfs2_extent_tree get/put instead of alloc.
Date
From: Joel Becker <joel.becker@oracle.com>

Rather than allocating a struct ocfs2_extent_tree, just put it on the
stack. Fill it with ocfs2_get_extent_tree() and drop it with
ocfs2_put_extent_tree(). Now the callers don't have to ENOMEM, yet
still safely ref the root_bh.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
---
fs/ocfs2/alloc.c | 117 ++++++++++++++++-------------------------------------
1 files changed, 36 insertions(+), 81 deletions(-)
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index ab16b89..0abf11e 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -223,22 +223,17 @@ static struct ocfs2_extent_tree_operations ocfs2_xattr_tree_et_ops = {
.eo_sanity_check = ocfs2_xattr_tree_sanity_check,
};

-static struct ocfs2_extent_tree*
- ocfs2_new_extent_tree(struct inode *inode,
- struct buffer_head *bh,
- enum ocfs2_extent_tree_type et_type,
- void *private)
+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 *private)
{
- struct ocfs2_extent_tree *et;
-
- et = kzalloc(sizeof(*et), GFP_NOFS);
- if (!et)
- return NULL;
-
et->et_type = et_type;
get_bh(bh);
et->et_root_bh = bh;
et->et_private = private;
+ et->et_max_leaf_clusters = 0;

if (et_type == OCFS2_DINODE_EXTENT) {
et->et_root_el =
@@ -257,16 +252,11 @@ static struct ocfs2_extent_tree*
et->et_max_leaf_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
OCFS2_MAX_XATTR_TREE_LEAF_SIZE);
}
-
- return et;
}

-static void ocfs2_free_extent_tree(struct ocfs2_extent_tree *et)
+static void ocfs2_put_extent_tree(struct ocfs2_extent_tree *et)
{
- if (et) {
- brelse(et->et_root_bh);
- kfree(et);
- }
+ brelse(et->et_root_bh);
}

static inline void ocfs2_et_set_last_eb_blk(struct ocfs2_extent_tree *et,
@@ -4439,22 +4429,15 @@ int ocfs2_dinode_insert_extent(struct ocfs2_super *osb,
struct ocfs2_alloc_context *meta_ac)
{
int status;
- struct ocfs2_extent_tree *et = NULL;
-
- et = ocfs2_new_extent_tree(inode, root_bh, OCFS2_DINODE_EXTENT, NULL);
- if (!et) {
- status = -ENOMEM;
- mlog_errno(status);
- goto bail;
- }
+ struct ocfs2_extent_tree et;

+ ocfs2_get_extent_tree(&et, inode, root_bh, OCFS2_DINODE_EXTENT,
+ NULL);
status = ocfs2_insert_extent(osb, handle, inode, root_bh,
cpos, start_blk, new_clusters,
- flags, meta_ac, et);
+ flags, meta_ac, &et);
+ ocfs2_put_extent_tree(&et);

- if (et)
- ocfs2_free_extent_tree(et);
-bail:
return status;
}

@@ -4470,23 +4453,15 @@ int ocfs2_xattr_value_insert_extent(struct ocfs2_super *osb,
void *private)
{
int status;
- struct ocfs2_extent_tree *et = NULL;
-
- et = ocfs2_new_extent_tree(inode, root_bh,
- OCFS2_XATTR_VALUE_EXTENT, private);
- if (!et) {
- status = -ENOMEM;
- mlog_errno(status);
- goto bail;
- }
+ struct ocfs2_extent_tree et;

+ ocfs2_get_extent_tree(&et, inode, root_bh,
+ OCFS2_XATTR_VALUE_EXTENT, private);
status = ocfs2_insert_extent(osb, handle, inode, root_bh,
cpos, start_blk, new_clusters,
- flags, meta_ac, et);
+ flags, meta_ac, &et);
+ ocfs2_put_extent_tree(&et);

- if (et)
- ocfs2_free_extent_tree(et);
-bail:
return status;
}

@@ -4501,23 +4476,15 @@ int ocfs2_xattr_tree_insert_extent(struct ocfs2_super *osb,
struct ocfs2_alloc_context *meta_ac)
{
int status;
- struct ocfs2_extent_tree *et = NULL;
-
- et = ocfs2_new_extent_tree(inode, root_bh, OCFS2_XATTR_TREE_EXTENT,
- NULL);
- if (!et) {
- status = -ENOMEM;
- mlog_errno(status);
- goto bail;
- }
+ struct ocfs2_extent_tree et;

+ ocfs2_get_extent_tree(&et, inode, root_bh, OCFS2_XATTR_TREE_EXTENT,
+ NULL);
status = ocfs2_insert_extent(osb, handle, inode, root_bh,
cpos, start_blk, new_clusters,
- flags, meta_ac, et);
+ flags, meta_ac, &et);
+ ocfs2_put_extent_tree(&et);

- if (et)
- ocfs2_free_extent_tree(et);
-bail:
return status;
}

@@ -4906,11 +4873,13 @@ int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh,
struct ocfs2_extent_rec split_rec;
struct ocfs2_path *left_path = NULL;
struct ocfs2_extent_list *el;
- struct ocfs2_extent_tree *et = NULL;
+ 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, private);
+
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 "
@@ -4920,13 +4889,6 @@ int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh,
goto out;
}

- et = ocfs2_new_extent_tree(inode, root_bh, et_type, private);
- if (!et) {
- ret = -ENOMEM;
- mlog_errno(ret);
- goto out;
- }
-
/*
* XXX: This should be fixed up so that we just re-insert the
* next extent records.
@@ -4934,7 +4896,7 @@ int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh,
if (et_type == OCFS2_DINODE_EXTENT)
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);
@@ -4965,7 +4927,7 @@ int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh,
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)
@@ -4973,8 +4935,7 @@ int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh,

out:
ocfs2_free_path(left_path);
- if (et)
- ocfs2_free_extent_tree(et);
+ ocfs2_put_extent_tree(&et);
return ret;
}

@@ -5216,18 +5177,13 @@ int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh,
struct ocfs2_extent_rec *rec;
struct ocfs2_extent_list *el;
struct ocfs2_path *path = NULL;
- struct ocfs2_extent_tree *et = NULL;
+ struct ocfs2_extent_tree et;

- et = ocfs2_new_extent_tree(inode, root_bh, et_type, private);
- if (!et) {
- ret = -ENOMEM;
- mlog_errno(ret);
- goto out;
- }
+ ocfs2_get_extent_tree(&et, inode, root_bh, et_type, private);

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);
@@ -5280,13 +5236,13 @@ int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh,

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);
@@ -5335,7 +5291,7 @@ int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh,
}

ret = ocfs2_truncate_rec(inode, handle, path, index, dealloc,
- cpos, len, et);
+ cpos, len, &et);
if (ret) {
mlog_errno(ret);
goto out;
@@ -5344,8 +5300,7 @@ int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh,

out:
ocfs2_free_path(path);
- if (et)
- ocfs2_free_extent_tree(et);
+ ocfs2_put_extent_tree(&et);
return ret;
}

--
1.5.4.5


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