switch stat_file() to passing a single struct rather than fsckloads of pointers

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/hostfs/hostfs.h

@@ -53,11 +53,21 @@ struct hostfs_iattr {
 	struct timespec	ia_ctime;
 };
 
-extern int stat_file(const char *path, unsigned long long *inode_out,
-		     int *mode_out, int *nlink_out, int *uid_out, int *gid_out,
-		     unsigned long long *size_out, struct timespec *atime_out,
-		     struct timespec *mtime_out, struct timespec *ctime_out,
-		     int *blksize_out, unsigned long long *blocks_out, int fd);
+struct hostfs_stat {
+	unsigned long long ino;
+	unsigned int mode;
+	unsigned int nlink;
+	unsigned int uid;
+	unsigned int gid;
+	unsigned long long size;
+	struct timespec atime, mtime, ctime;
+	unsigned int blksize;
+	unsigned long long blocks;
+	unsigned int maj;
+	unsigned int min;
+};
+
+extern int stat_file(const char *path, struct hostfs_stat *p, int fd);
 extern int access_file(char *path, int r, int w, int x);
 extern int open_file(char *path, int r, int w, int append);
 extern int file_type(const char *path, int *maj, int *min);

fs/hostfs/hostfs_kern.c

@@ -131,28 +131,21 @@ static char *inode_name(struct inode *ino, int extra)
 
 static int read_name(struct inode *ino, char *name)
 {
-	/*
-	 * The non-int inode fields are copied into ints by stat_file and
-	 * then copied into the inode because passing the actual pointers
-	 * in and having them treated as int * breaks on big-endian machines
-	 */
-	int err;
-	int i_mode, i_nlink, i_blksize;
-	unsigned long long i_size;
-	unsigned long long i_ino;
-	unsigned long long i_blocks;
-
-	err = stat_file(name, &i_ino, &i_mode, &i_nlink, &ino->i_uid,
-			&ino->i_gid, &i_size, &ino->i_atime, &ino->i_mtime,
-			&ino->i_ctime, &i_blksize, &i_blocks, -1);
+	struct hostfs_stat st;
+	int err = stat_file(name, &st, -1);
 	if (err)
 		return err;
 
-	ino->i_ino = i_ino;
-	ino->i_mode = i_mode;
-	ino->i_nlink = i_nlink;
-	ino->i_size = i_size;
-	ino->i_blocks = i_blocks;
+	ino->i_ino = st.ino;
+	ino->i_mode = st.mode;
+	ino->i_nlink = st.nlink;
+	ino->i_uid = st.uid;
+	ino->i_gid = st.gid;
+	ino->i_atime = st.atime;
+	ino->i_mtime = st.mtime;
+	ino->i_ctime = st.ctime;
+	ino->i_size = st.size;
+	ino->i_blocks = st.blocks;
 	return 0;
 }
 

fs/hostfs/hostfs_user.c

@@ -19,11 +19,27 @@
 #include "user.h"
 #include <utime.h>
 
-int stat_file(const char *path, unsigned long long *inode_out, int *mode_out,
-	      int *nlink_out, int *uid_out, int *gid_out,
-	      unsigned long long *size_out, struct timespec *atime_out,
-	      struct timespec *mtime_out, struct timespec *ctime_out,
-	      int *blksize_out, unsigned long long *blocks_out, int fd)
+static void stat64_to_hostfs(const struct stat64 *buf, struct hostfs_stat *p)
+{
+	p->ino = buf->st_ino;
+	p->mode = buf->st_mode;
+	p->nlink = buf->st_nlink;
+	p->uid = buf->st_uid;
+	p->gid = buf->st_gid;
+	p->size = buf->st_size;
+	p->atime.tv_sec = buf->st_atime;
+	p->atime.tv_nsec = 0;
+	p->ctime.tv_sec = buf->st_ctime;
+	p->ctime.tv_nsec = 0;
+	p->mtime.tv_sec = buf->st_mtime;
+	p->mtime.tv_nsec = 0;
+	p->blksize = buf->st_blksize;
+	p->blocks = buf->st_blocks;
+	p->maj = os_major(buf->st_rdev);
+	p->min = os_minor(buf->st_rdev);
+}
+
+int stat_file(const char *path, struct hostfs_stat *p, int fd)
 {
 	struct stat64 buf;
 
@@ -33,35 +49,7 @@ int stat_file(const char *path, unsigned long long *inode_out, int *mode_out,
 	} else if (lstat64(path, &buf) < 0) {
 		return -errno;
 	}
-
-	if (inode_out != NULL)
-		*inode_out = buf.st_ino;
-	if (mode_out != NULL)
-		*mode_out = buf.st_mode;
-	if (nlink_out != NULL)
-		*nlink_out = buf.st_nlink;
-	if (uid_out != NULL)
-		*uid_out = buf.st_uid;
-	if (gid_out != NULL)
-		*gid_out = buf.st_gid;
-	if (size_out != NULL)
-		*size_out = buf.st_size;
-	if (atime_out != NULL) {
-		atime_out->tv_sec = buf.st_atime;
-		atime_out->tv_nsec = 0;
-	}
-	if (mtime_out != NULL) {
-		mtime_out->tv_sec = buf.st_mtime;
-		mtime_out->tv_nsec = 0;
-	}
-	if (ctime_out != NULL) {
-		ctime_out->tv_sec = buf.st_ctime;
-		ctime_out->tv_nsec = 0;
-	}
-	if (blksize_out != NULL)
-		*blksize_out = buf.st_blksize;
-	if (blocks_out != NULL)
-		*blocks_out = buf.st_blocks;
+	stat64_to_hostfs(&buf, p);
 	return 0;
 }
 
@@ -235,8 +223,8 @@ int file_create(char *name, int ur, int uw, int ux, int gr,
 
 int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
 {
+	struct hostfs_stat st;
 	struct timeval times[2];
-	struct timespec atime_ts, mtime_ts;
 	int err, ma;
 
 	if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
@@ -279,15 +267,14 @@ int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
 	 */
 	ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
 	if (attrs->ia_valid & ma) {
-		err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
-				&atime_ts, &mtime_ts, NULL, NULL, NULL, fd);
+		err = stat_file(file, &st, fd);
 		if (err != 0)
 			return err;
 
-		times[0].tv_sec = atime_ts.tv_sec;
-		times[0].tv_usec = atime_ts.tv_nsec / 1000;
-		times[1].tv_sec = mtime_ts.tv_sec;
-		times[1].tv_usec = mtime_ts.tv_nsec / 1000;
+		times[0].tv_sec = st.atime.tv_sec;
+		times[0].tv_usec = st.atime.tv_nsec / 1000;
+		times[1].tv_sec = st.mtime.tv_sec;
+		times[1].tv_usec = st.mtime.tv_nsec / 1000;
 
 		if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
 			times[0].tv_sec = attrs->ia_atime.tv_sec;
@@ -308,9 +295,9 @@ int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
 
 	/* Note: ctime is not handled */
 	if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) {
-		err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
-				&attrs->ia_atime, &attrs->ia_mtime, NULL,
-				NULL, NULL, fd);
+		err = stat_file(file, &st, fd);
+		attrs->ia_atime = st.atime;
+		attrs->ia_mtime = st.mtime;
 		if (err != 0)
 			return err;
 	}