[PATCH 03/17] ocfs2/dlm: replace __get_free_page() with kmalloc()

A few places in ocsfs2 allocate temporary buffers with __get_free_page() or
get_zeroed_page().

kmalloc() is a better API for such use and it also provides better
scalability and more debugging possibilities.

Replace use of __get_free_page() and get_zeroed_page() with kmalloc() and
kzalloc() respectively.

Signed-off-by: Mike Rapoport (Microsoft) <[email protected]>
---
 fs/ocfs2/dlm/dlmdebug.c    | 24 +++++++++---------------
 fs/ocfs2/dlm/dlmdomain.c   |  8 +++++---
 fs/ocfs2/dlm/dlmmaster.c   |  5 ++---
 fs/ocfs2/dlm/dlmrecovery.c |  4 ++--
 4 files changed, 18 insertions(+), 23 deletions(-)

diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
index fe4fdd09bae3..6ca8b3b68eef 100644
--- a/fs/ocfs2/dlm/dlmdebug.c
+++ b/fs/ocfs2/dlm/dlmdebug.c
@@ -260,10 +260,10 @@ void dlm_print_one_mle(struct dlm_master_list_entry *mle)
 {
 	char *buf;
 
-	buf = (char *) get_zeroed_page(GFP_ATOMIC);
+	buf = kzalloc(PAGE_SIZE, GFP_ATOMIC);
 	if (buf) {
 		dump_mle(mle, buf, PAGE_SIZE - 1);
-		free_page((unsigned long)buf);
+		kfree(buf);
 	}
 }
 
@@ -280,7 +280,7 @@ static struct dentry *dlm_debugfs_root;
 /* begin - utils funcs */
 static int debug_release(struct inode *inode, struct file *file)
 {
-	free_page((unsigned long)file->private_data);
+	kfree(file->private_data);
 	return 0;
 }
 
@@ -327,17 +327,15 @@ static int debug_purgelist_open(struct inode *inode, struct file *file)
 	struct dlm_ctxt *dlm = inode->i_private;
 	char *buf = NULL;
 
-	buf = (char *) get_zeroed_page(GFP_NOFS);
+	buf = kzalloc(PAGE_SIZE, GFP_NOFS);
 	if (!buf)
-		goto bail;
+		return -ENOMEM;
 
 	i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1));
 
 	file->private_data = buf;
 
 	return 0;
-bail:
-	return -ENOMEM;
 }
 
 static const struct file_operations debug_purgelist_fops = {
@@ -384,17 +382,15 @@ static int debug_mle_open(struct inode *inode, struct file *file)
 	struct dlm_ctxt *dlm = inode->i_private;
 	char *buf = NULL;
 
-	buf = (char *) get_zeroed_page(GFP_NOFS);
+	buf = kzalloc(PAGE_SIZE, GFP_NOFS);
 	if (!buf)
-		goto bail;
+		return -ENOMEM;
 
 	i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1));
 
 	file->private_data = buf;
 
 	return 0;
-bail:
-	return -ENOMEM;
 }
 
 static const struct file_operations debug_mle_fops = {
@@ -775,17 +771,15 @@ static int debug_state_open(struct inode *inode, struct file *file)
 	struct dlm_ctxt *dlm = inode->i_private;
 	char *buf = NULL;
 
-	buf = (char *) get_zeroed_page(GFP_NOFS);
+	buf = kzalloc(PAGE_SIZE, GFP_NOFS);
 	if (!buf)
-		goto bail;
+		return -ENOMEM;
 
 	i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1));
 
 	file->private_data = buf;
 
 	return 0;
-bail:
-	return -ENOMEM;
 }
 
 static const struct file_operations debug_state_fops = {
diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
index dc9da9133c8e..97bb9400e24b 100644
--- a/fs/ocfs2/dlm/dlmdomain.c
+++ b/fs/ocfs2/dlm/dlmdomain.c
@@ -63,7 +63,7 @@ static inline void byte_copymap(u8 dmap[], unsigned long smap[],
 static void dlm_free_pagevec(void **vec, int pages)
 {
 	while (pages--)
-		free_page((unsigned long)vec[pages]);
+		kfree(vec[pages]);
 	kfree(vec);
 }
 
@@ -75,9 +75,11 @@ static void **dlm_alloc_pagevec(int pages)
 	if (!vec)
 		return NULL;
 
-	for (i = 0; i < pages; i++)
-		if (!(vec[i] = (void *)__get_free_page(GFP_KERNEL)))
+	for (i = 0; i < pages; i++) {
+		vec[i] = kmalloc(PAGE_SIZE, GFP_KERNEL);
+		if (!vec[i])
 			goto out_free;
+	}
 
 	mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n",
 	     pages, (unsigned long)DLM_HASH_PAGES,
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 93eff38fdadd..aee3b4c56dcc 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -2548,7 +2548,7 @@ static int dlm_migrate_lockres(struct dlm_ctxt *dlm,
 
 	/* preallocate up front. if this fails, abort */
 	ret = -ENOMEM;
-	mres = (struct dlm_migratable_lockres *) __get_free_page(GFP_NOFS);
+	mres = kmalloc(PAGE_SIZE, GFP_NOFS);
 	if (!mres) {
 		mlog_errno(ret);
 		goto leave;
@@ -2725,8 +2725,7 @@ static int dlm_migrate_lockres(struct dlm_ctxt *dlm,
 	if (wake)
 		wake_up(&res->wq);
 
-	if (mres)
-		free_page((unsigned long)mres);
+	kfree(mres);
 
 	dlm_put(dlm);
 
diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
index 128872bd945d..9b97bf73df22 100644
--- a/fs/ocfs2/dlm/dlmrecovery.c
+++ b/fs/ocfs2/dlm/dlmrecovery.c
@@ -837,7 +837,7 @@ int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data,
 	}
 
 	/* this will get freed by dlm_request_all_locks_worker */
-	buf = (char *) __get_free_page(GFP_NOFS);
+	buf = kmalloc(PAGE_SIZE, GFP_NOFS);
 	if (!buf) {
 		kfree(item);
 		dlm_put(dlm);
@@ -933,7 +933,7 @@ static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data)
 		}
 	}
 leave:
-	free_page((unsigned long)data);
+	kfree(data);
 }
 
 

-- 
2.53.0