fs/adfs: dir: add common directory buffer release method

With the bhs pointer in place, we have no need for separate per-format
free() methods, since a generic version will do.  Provide a generic
implementation, remove the format specific implementations and the
method function pointer.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/adfs/adfs.h

@@ -126,7 +126,6 @@ struct adfs_dir_ops {
 	int	(*create)(struct adfs_dir *dir, struct object_info *obj);
 	int	(*remove)(struct adfs_dir *dir, struct object_info *obj);
 	int	(*sync)(struct adfs_dir *dir);
-	void	(*free)(struct adfs_dir *dir);
 };
 
 struct adfs_discmap {
@@ -167,6 +166,7 @@ extern const struct dentry_operations adfs_dentry_operations;
 extern const struct adfs_dir_ops adfs_f_dir_ops;
 extern const struct adfs_dir_ops adfs_fplus_dir_ops;
 
+void adfs_dir_relse(struct adfs_dir *dir);
 void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj);
 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
 			   int wait);

fs/adfs/dir.c

@@ -6,6 +6,7 @@
  *
  *  Common directory handling for ADFS
  */
+#include <linux/slab.h>
 #include "adfs.h"
 
 /*
@@ -13,6 +14,20 @@
  */
 static DEFINE_RWLOCK(adfs_dir_lock);
 
+void adfs_dir_relse(struct adfs_dir *dir)
+{
+	unsigned int i;
+
+	for (i = 0; i < dir->nr_buffers; i++)
+		brelse(dir->bhs[i]);
+	dir->nr_buffers = 0;
+
+	if (dir->bhs != dir->bh)
+		kfree(dir->bhs);
+	dir->bhs = NULL;
+	dir->sb = NULL;
+}
+
 static int adfs_dir_read(struct super_block *sb, u32 indaddr,
 			 unsigned int size, struct adfs_dir *dir)
 {
@@ -105,7 +120,7 @@ adfs_readdir(struct file *file, struct dir_context *ctx)
 	read_unlock(&adfs_dir_lock);
 
 free_out:
-	ops->free(&dir);
+	adfs_dir_relse(&dir);
 	return ret;
 }
 
@@ -139,7 +154,7 @@ adfs_dir_update(struct super_block *sb, struct object_info *obj, int wait)
 			ret = err;
 	}
 
-	ops->free(&dir);
+	adfs_dir_relse(&dir);
 out:
 #endif
 	return ret;
@@ -211,7 +226,7 @@ static int adfs_dir_lookup_byname(struct inode *inode, const struct qstr *qstr,
 	read_unlock(&adfs_dir_lock);
 
 free_out:
-	ops->free(&dir);
+	adfs_dir_relse(&dir);
 out:
 	return ret;
 }

fs/adfs/dir_f.c

@@ -9,8 +9,6 @@
 #include "adfs.h"
 #include "dir_f.h"
 
-static void adfs_f_free(struct adfs_dir *dir);
-
 /*
  * Read an (unaligned) value of length 1..4 bytes
  */
@@ -128,7 +126,7 @@ static int adfs_dir_read(struct super_block *sb, u32 indaddr,
 			 unsigned int size, struct adfs_dir *dir)
 {
 	const unsigned int blocksize_bits = sb->s_blocksize_bits;
-	int blk = 0;
+	int blk;
 
 	/*
 	 * Directories which are not a multiple of 2048 bytes
@@ -152,6 +150,8 @@ static int adfs_dir_read(struct super_block *sb, u32 indaddr,
 		dir->bh[blk] = sb_bread(sb, phys);
 		if (!dir->bh[blk])
 			goto release_buffers;
+
+		dir->nr_buffers += 1;
 	}
 
 	memcpy(&dir->dirhead, bufoff(dir->bh, 0), sizeof(dir->dirhead));
@@ -168,17 +168,12 @@ static int adfs_dir_read(struct super_block *sb, u32 indaddr,
 	if (adfs_dir_checkbyte(dir) != dir->dirtail.new.dircheckbyte)
 		goto bad_dir;
 
-	dir->nr_buffers = blk;
-
 	return 0;
 
 bad_dir:
 	adfs_error(sb, "dir %06x is corrupted", indaddr);
 release_buffers:
-	for (blk -= 1; blk >= 0; blk -= 1)
-		brelse(dir->bh[blk]);
-
-	dir->sb = NULL;
+	adfs_dir_relse(dir);
 
 	return -EIO;
 }
@@ -435,25 +430,10 @@ adfs_f_sync(struct adfs_dir *dir)
 	return err;
 }
 
-static void
-adfs_f_free(struct adfs_dir *dir)
-{
-	int i;
-
-	for (i = dir->nr_buffers - 1; i >= 0; i--) {
-		brelse(dir->bh[i]);
-		dir->bh[i] = NULL;
-	}
-
-	dir->nr_buffers = 0;
-	dir->sb = NULL;
-}
-
 const struct adfs_dir_ops adfs_f_dir_ops = {
 	.read		= adfs_f_read,
 	.setpos		= adfs_f_setpos,
 	.getnext	= adfs_f_getnext,
 	.update		= adfs_f_update,
 	.sync		= adfs_f_sync,
-	.free		= adfs_f_free
 };

fs/adfs/dir_fplus.c

@@ -15,7 +15,7 @@ adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct
 	struct adfs_bigdirtail *t;
 	unsigned long block;
 	unsigned int blk, size;
-	int i, ret = -EIO;
+	int ret = -EIO;
 
 	block = __adfs_block_map(sb, id, 0);
 	if (!block) {
@@ -92,18 +92,8 @@ adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct
 	return 0;
 
 out:
-	if (dir->bhs) {
-		for (i = 0; i < dir->nr_buffers; i++)
-			brelse(dir->bhs[i]);
+	adfs_dir_relse(dir);
 
-		if (&dir->bh[0] != dir->bhs)
-			kfree(dir->bhs);
-
-		dir->bhs = NULL;
-	}
-
-	dir->nr_buffers = 0;
-	dir->sb = NULL;
 	return ret;
 }
 
@@ -205,29 +195,9 @@ adfs_fplus_sync(struct adfs_dir *dir)
 	return err;
 }
 
-static void
-adfs_fplus_free(struct adfs_dir *dir)
-{
-	int i;
-
-	if (dir->bhs) {
-		for (i = 0; i < dir->nr_buffers; i++)
-			brelse(dir->bhs[i]);
-
-		if (&dir->bh[0] != dir->bhs)
-			kfree(dir->bhs);
-
-		dir->bhs = NULL;
-	}
-
-	dir->nr_buffers = 0;
-	dir->sb = NULL;
-}
-
 const struct adfs_dir_ops adfs_fplus_dir_ops = {
 	.read		= adfs_fplus_read,
 	.setpos		= adfs_fplus_setpos,
 	.getnext	= adfs_fplus_getnext,
 	.sync		= adfs_fplus_sync,
-	.free		= adfs_fplus_free
 };