fs/jfs: Switch to use new generic UUID API

There are new types and helpers that are supposed to be used in new code.

As a preparation to get rid of legacy types and API functions do
the conversion here.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

fs/jfs/jfs_incore.h

@@ -23,6 +23,8 @@
 #include <linux/rwsem.h>
 #include <linux/slab.h>
 #include <linux/bitops.h>
+#include <linux/uuid.h>
+
 #include "jfs_types.h"
 #include "jfs_xtree.h"
 #include "jfs_dtree.h"
@@ -178,8 +180,8 @@ struct jfs_sb_info {
 	pxd_t		logpxd;		/* pxd describing log	*/
 	pxd_t		fsckpxd;	/* pxd describing fsck wkspc */
 	pxd_t		ait2;		/* pxd describing AIT copy	*/
-	char		uuid[16];	/* 128-bit uuid for volume	*/
-	char		loguuid[16];	/* 128-bit uuid for log	*/
+	uuid_t		uuid;		/* 128-bit uuid for volume	*/
+	uuid_t		loguuid;	/* 128-bit uuid for log	*/
 	/*
 	 * commit_state is used for synchronization of the jfs_commit
 	 * threads.  It is protected by LAZY_LOCK().

fs/jfs/jfs_logmgr.c

@@ -1092,8 +1092,7 @@ int lmLogOpen(struct super_block *sb)
 	mutex_lock(&jfs_log_mutex);
 	list_for_each_entry(log, &jfs_external_logs, journal_list) {
 		if (log->bdev->bd_dev == sbi->logdev) {
-			if (memcmp(log->uuid, sbi->loguuid,
-				   sizeof(log->uuid))) {
+			if (!uuid_equal(&log->uuid, &sbi->loguuid)) {
 				jfs_warn("wrong uuid on JFS journal");
 				mutex_unlock(&jfs_log_mutex);
 				return -EINVAL;
@@ -1130,7 +1129,7 @@ int lmLogOpen(struct super_block *sb)
 	}
 
 	log->bdev = bdev;
-	memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid));
+	uuid_copy(&log->uuid, &sbi->loguuid);
 
 	/*
 	 * initialize log:
@@ -1336,7 +1335,7 @@ int lmLogInit(struct jfs_log * log)
 			jfs_info("lmLogInit: inline log:0x%p base:0x%Lx size:0x%x",
 				 log, (unsigned long long)log->base, log->size);
 		} else {
-			if (memcmp(logsuper->uuid, log->uuid, 16)) {
+			if (!uuid_equal(&logsuper->uuid, &log->uuid)) {
 				jfs_warn("wrong uuid on JFS log device");
 				goto errout20;
 			}
@@ -1732,7 +1731,7 @@ static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
 	int i;
 	struct logsuper *logsuper;
 	struct lbuf *bpsuper;
-	char *uuid = sbi->uuid;
+	uuid_t *uuid = &sbi->uuid;
 
 	/*
 	 * insert/remove file system device to log active file system list.
@@ -1743,8 +1742,8 @@ static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
 	logsuper = (struct logsuper *) bpsuper->l_ldata;
 	if (activate) {
 		for (i = 0; i < MAX_ACTIVE; i++)
-			if (!memcmp(logsuper->active[i].uuid, NULL_UUID, 16)) {
-				memcpy(logsuper->active[i].uuid, uuid, 16);
+			if (uuid_is_null(&logsuper->active[i].uuid)) {
+				uuid_copy(&logsuper->active[i].uuid, uuid);
 				sbi->aggregate = i;
 				break;
 			}
@@ -1755,8 +1754,9 @@ static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
 		}
 	} else {
 		for (i = 0; i < MAX_ACTIVE; i++)
-			if (!memcmp(logsuper->active[i].uuid, uuid, 16)) {
-				memcpy(logsuper->active[i].uuid, NULL_UUID, 16);
+			if (uuid_equal(&logsuper->active[i].uuid, uuid)) {
+				uuid_copy(&logsuper->active[i].uuid,
+					  &uuid_null);
 				break;
 			}
 		if (i == MAX_ACTIVE) {

fs/jfs/jfs_logmgr.h

@@ -19,6 +19,8 @@
 #ifndef	_H_JFS_LOGMGR
 #define _H_JFS_LOGMGR
 
+#include <linux/uuid.h>
+
 #include "jfs_filsys.h"
 #include "jfs_lock.h"
 
@@ -73,15 +75,13 @@ struct logsuper {
 	__le32 state;		/* 4: state - see below */
 
 	__le32 end;		/* 4: addr of last log record set by logredo */
-	char uuid[16];		/* 16: 128-bit journal uuid */
+	uuid_t uuid;		/* 16: 128-bit journal uuid */
 	char label[16];		/* 16: journal label */
 	struct {
-		char uuid[16];
+		uuid_t uuid;
 	} active[MAX_ACTIVE];	/* 2048: active file systems list */
 };
 
-#define NULL_UUID "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
-
 /* log flag: commit option (see jfs_filsys.h) */
 
 /* log state */
@@ -410,7 +410,7 @@ struct jfs_log {
 	spinlock_t synclock;	/* 4: synclist lock */
 	struct lbuf *wqueue;	/* 4: log pageout queue */
 	int count;		/* 4: count */
-	char uuid[16];		/* 16: 128-bit uuid of log device */
+	uuid_t uuid;		/* 16: 128-bit uuid of log device */
 
 	int no_integrity;	/* 3: flag to disable journaling to disk */
 };

fs/jfs/jfs_mount.c

@@ -389,8 +389,8 @@ static int chkSuper(struct super_block *sb)
 		sbi->logpxd = j_sb->s_logpxd;
 	else {
 		sbi->logdev = new_decode_dev(le32_to_cpu(j_sb->s_logdev));
-		memcpy(sbi->uuid, j_sb->s_uuid, sizeof(sbi->uuid));
-		memcpy(sbi->loguuid, j_sb->s_loguuid, sizeof(sbi->uuid));
+		uuid_copy(&sbi->uuid, &j_sb->s_uuid);
+		uuid_copy(&sbi->loguuid, &j_sb->s_loguuid);
 	}
 	sbi->fsckpxd = j_sb->s_fsckpxd;
 	sbi->ait2 = j_sb->s_ait2;

fs/jfs/jfs_superblock.h

@@ -18,6 +18,8 @@
 #ifndef	_H_JFS_SUPERBLOCK
 #define _H_JFS_SUPERBLOCK
 
+#include <linux/uuid.h>
+
 /*
  * make the magic number something a human could read
  */
@@ -98,9 +100,9 @@ struct jfs_superblock {
 	__le64 s_xsize;		/* 8: extendfs s_size */
 	pxd_t s_xfsckpxd;	/* 8: extendfs fsckpxd */
 	pxd_t s_xlogpxd;	/* 8: extendfs logpxd */
-	char s_uuid[16];	/* 16: 128-bit uuid for volume */
+	uuid_t s_uuid;		/* 16: 128-bit uuid for volume */
 	char s_label[16];	/* 16: volume label */
-	char s_loguuid[16];	/* 16: 128-bit uuid for log device */
+	uuid_t s_loguuid;	/* 16: 128-bit uuid for log device */
 
 };
 

fs/jfs/super.c

@@ -174,8 +174,10 @@ static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	buf->f_files = maxinodes;
 	buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 				    atomic_read(&imap->im_numfree));
-	buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
-	buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
+	buf->f_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid,
+				      sizeof(sbi->uuid)/2);
+	buf->f_fsid.val[1] = crc32_le(0,
+				      (char *)&sbi->uuid + sizeof(sbi->uuid)/2,
 				      sizeof(sbi->uuid)/2);
 
 	buf->f_namelen = JFS_NAME_MAX;