Merge tag 'exfat-for-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat

Pull exfat updates from Namjae Jeon:

 - Add ioctls to get and set file attribute that is used in
   the fatattr util

 - Add zero_size_dir mount option to avoid allocating a cluster
   when creating a directory

* tag 'exfat-for-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat:
  exfat: support create zero-size directory
  exfat: support handle zero-size directory
  exfat: add ioctls for accessing attributes

7 files changed, 171 insertions, 48 deletions

diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c
index e1586bba6d8623..9f9295847a4e6e 100644
--- a/fs/exfat/dir.c
+++ b/fs/exfat/dir.c
@@ -287,7 +287,7 @@ get_new:
 
 	mutex_unlock(&EXFAT_SB(sb)->s_lock);
 	if (!dir_emit(ctx, nb->lfn, strlen(nb->lfn), inum,
-			(de.attr & ATTR_SUBDIR) ? DT_DIR : DT_REG))
+			(de.attr & EXFAT_ATTR_SUBDIR) ? DT_DIR : DT_REG))
 		goto out;
 	ctx->pos = cpos;
 	goto get_new;
@@ -359,7 +359,7 @@ unsigned int exfat_get_entry_type(struct exfat_dentry *ep)
 		if (ep->type == EXFAT_VOLUME)
 			return TYPE_VOLUME;
 		if (ep->type == EXFAT_FILE) {
-			if (le16_to_cpu(ep->dentry.file.attr) & ATTR_SUBDIR)
+			if (le16_to_cpu(ep->dentry.file.attr) & EXFAT_ATTR_SUBDIR)
 				return TYPE_DIR;
 			return TYPE_FILE;
 		}
@@ -410,19 +410,21 @@ static void exfat_set_entry_type(struct exfat_dentry *ep, unsigned int type)
 		ep->type = EXFAT_VOLUME;
 	} else if (type == TYPE_DIR) {
 		ep->type = EXFAT_FILE;
-		ep->dentry.file.attr = cpu_to_le16(ATTR_SUBDIR);
+		ep->dentry.file.attr = cpu_to_le16(EXFAT_ATTR_SUBDIR);
 	} else if (type == TYPE_FILE) {
 		ep->type = EXFAT_FILE;
-		ep->dentry.file.attr = cpu_to_le16(ATTR_ARCHIVE);
+		ep->dentry.file.attr = cpu_to_le16(EXFAT_ATTR_ARCHIVE);
 	}
 }
 
 static void exfat_init_stream_entry(struct exfat_dentry *ep,
-		unsigned char flags, unsigned int start_clu,
-		unsigned long long size)
+		unsigned int start_clu, unsigned long long size)
 {
 	exfat_set_entry_type(ep, TYPE_STREAM);
-	ep->dentry.stream.flags = flags;
+	if (size == 0)
+		ep->dentry.stream.flags = ALLOC_FAT_CHAIN;
+	else
+		ep->dentry.stream.flags = ALLOC_NO_FAT_CHAIN;
 	ep->dentry.stream.start_clu = cpu_to_le32(start_clu);
 	ep->dentry.stream.valid_size = cpu_to_le64(size);
 	ep->dentry.stream.size = cpu_to_le64(size);
@@ -488,9 +490,7 @@ int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir,
 	if (!ep)
 		return -EIO;
 
-	exfat_init_stream_entry(ep,
-		(type == TYPE_FILE) ? ALLOC_FAT_CHAIN : ALLOC_NO_FAT_CHAIN,
-		start_clu, size);
+	exfat_init_stream_entry(ep, start_clu, size);
 	exfat_update_bh(bh, IS_DIRSYNC(inode));
 	brelse(bh);
 
diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h
index f78b614f44dc79..a7a2c35d74fbd7 100644
--- a/fs/exfat/exfat_fs.h
+++ b/fs/exfat/exfat_fs.h
@@ -234,6 +234,8 @@ struct exfat_mount_options {
 		 discard:1, /* Issue discard requests on deletions */
 		 keep_last_dots:1; /* Keep trailing periods in paths */
 	int time_offset; /* Offset of timestamps from UTC (in minutes) */
+	/* Support creating zero-size directory, default: false */
+	bool zero_size_dir;
 };
 
 /*
@@ -357,10 +359,10 @@ static inline int exfat_mode_can_hold_ro(struct inode *inode)
 static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi,
 		unsigned short attr, mode_t mode)
 {
-	if ((attr & ATTR_READONLY) && !(attr & ATTR_SUBDIR))
+	if ((attr & EXFAT_ATTR_READONLY) && !(attr & EXFAT_ATTR_SUBDIR))
 		mode &= ~0222;
 
-	if (attr & ATTR_SUBDIR)
+	if (attr & EXFAT_ATTR_SUBDIR)
 		return (mode & ~sbi->options.fs_dmask) | S_IFDIR;
 
 	return (mode & ~sbi->options.fs_fmask) | S_IFREG;
@@ -372,18 +374,18 @@ static inline unsigned short exfat_make_attr(struct inode *inode)
 	unsigned short attr = EXFAT_I(inode)->attr;
 
 	if (S_ISDIR(inode->i_mode))
-		attr |= ATTR_SUBDIR;
+		attr |= EXFAT_ATTR_SUBDIR;
 	if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222))
-		attr |= ATTR_READONLY;
+		attr |= EXFAT_ATTR_READONLY;
 	return attr;
 }
 
 static inline void exfat_save_attr(struct inode *inode, unsigned short attr)
 {
 	if (exfat_mode_can_hold_ro(inode))
-		EXFAT_I(inode)->attr = attr & (ATTR_RWMASK | ATTR_READONLY);
+		EXFAT_I(inode)->attr = attr & (EXFAT_ATTR_RWMASK | EXFAT_ATTR_READONLY);
 	else
-		EXFAT_I(inode)->attr = attr & ATTR_RWMASK;
+		EXFAT_I(inode)->attr = attr & EXFAT_ATTR_RWMASK;
 }
 
 static inline bool exfat_is_last_sector_in_cluster(struct exfat_sb_info *sbi,
diff --git a/fs/exfat/exfat_raw.h b/fs/exfat/exfat_raw.h
index 0ece2e43cf492c..971a1ccd0e89ea 100644
--- a/fs/exfat/exfat_raw.h
+++ b/fs/exfat/exfat_raw.h
@@ -64,15 +64,16 @@
 #define CS_DEFAULT		2
 
 /* file attributes */
-#define ATTR_READONLY		0x0001
-#define ATTR_HIDDEN		0x0002
-#define ATTR_SYSTEM		0x0004
-#define ATTR_VOLUME		0x0008
-#define ATTR_SUBDIR		0x0010
-#define ATTR_ARCHIVE		0x0020
-
-#define ATTR_RWMASK		(ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \
-				 ATTR_SUBDIR | ATTR_ARCHIVE)
+#define EXFAT_ATTR_READONLY	0x0001
+#define EXFAT_ATTR_HIDDEN	0x0002
+#define EXFAT_ATTR_SYSTEM	0x0004
+#define EXFAT_ATTR_VOLUME	0x0008
+#define EXFAT_ATTR_SUBDIR	0x0010
+#define EXFAT_ATTR_ARCHIVE	0x0020
+
+#define EXFAT_ATTR_RWMASK	(EXFAT_ATTR_HIDDEN | EXFAT_ATTR_SYSTEM | \
+				 EXFAT_ATTR_VOLUME | EXFAT_ATTR_SUBDIR | \
+				 EXFAT_ATTR_ARCHIVE)
 
 #define BOOTSEC_JUMP_BOOT_LEN		3
 #define BOOTSEC_FS_NAME_LEN		8
diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index 30ee2c8d36a59a..02c4e2937879e9 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -8,6 +8,9 @@
 #include <linux/cred.h>
 #include <linux/buffer_head.h>
 #include <linux/blkdev.h>
+#include <linux/fsnotify.h>
+#include <linux/security.h>
+#include <linux/msdos_fs.h>
 
 #include "exfat_raw.h"
 #include "exfat_fs.h"
@@ -144,7 +147,7 @@ int __exfat_truncate(struct inode *inode)
 	}
 
 	if (ei->type == TYPE_FILE)
-		ei->attr |= ATTR_ARCHIVE;
+		ei->attr |= EXFAT_ATTR_ARCHIVE;
 
 	/*
 	 * update the directory entry
@@ -315,6 +318,93 @@ out:
 	return error;
 }
 
+/*
+ * modified ioctls from fat/file.c by Welmer Almesberger
+ */
+static int exfat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
+{
+	u32 attr;
+
+	inode_lock_shared(inode);
+	attr = exfat_make_attr(inode);
+	inode_unlock_shared(inode);
+
+	return put_user(attr, user_attr);
+}
+
+static int exfat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
+{
+	struct inode *inode = file_inode(file);
+	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
+	int is_dir = S_ISDIR(inode->i_mode);
+	u32 attr, oldattr;
+	struct iattr ia;
+	int err;
+
+	err = get_user(attr, user_attr);
+	if (err)
+		goto out;
+
+	err = mnt_want_write_file(file);
+	if (err)
+		goto out;
+	inode_lock(inode);
+
+	oldattr = exfat_make_attr(inode);
+
+	/*
+	 * Mask attributes so we don't set reserved fields.
+	 */
+	attr &= (EXFAT_ATTR_READONLY | EXFAT_ATTR_HIDDEN | EXFAT_ATTR_SYSTEM |
+		 EXFAT_ATTR_ARCHIVE);
+	attr |= (is_dir ? EXFAT_ATTR_SUBDIR : 0);
+
+	/* Equivalent to a chmod() */
+	ia.ia_valid = ATTR_MODE | ATTR_CTIME;
+	ia.ia_ctime = current_time(inode);
+	if (is_dir)
+		ia.ia_mode = exfat_make_mode(sbi, attr, 0777);
+	else
+		ia.ia_mode = exfat_make_mode(sbi, attr, 0666 | (inode->i_mode & 0111));
+
+	/* The root directory has no attributes */
+	if (inode->i_ino == EXFAT_ROOT_INO && attr != EXFAT_ATTR_SUBDIR) {
+		err = -EINVAL;
+		goto out_unlock_inode;
+	}
+
+	if (((attr | oldattr) & EXFAT_ATTR_SYSTEM) &&
+	    !capable(CAP_LINUX_IMMUTABLE)) {
+		err = -EPERM;
+		goto out_unlock_inode;
+	}
+
+	/*
+	 * The security check is questionable...  We single
+	 * out the RO attribute for checking by the security
+	 * module, just because it maps to a file mode.
+	 */
+	err = security_inode_setattr(file_mnt_idmap(file),
+				     file->f_path.dentry, &ia);
+	if (err)
+		goto out_unlock_inode;
+
+	/* This MUST be done before doing anything irreversible... */
+	err = exfat_setattr(file_mnt_idmap(file), file->f_path.dentry, &ia);
+	if (err)
+		goto out_unlock_inode;
+
+	fsnotify_change(file->f_path.dentry, ia.ia_valid);
+
+	exfat_save_attr(inode, attr);
+	mark_inode_dirty(inode);
+out_unlock_inode:
+	inode_unlock(inode);
+	mnt_drop_write_file(file);
+out:
+	return err;
+}
+
 static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
 {
 	struct fstrim_range range;
@@ -345,8 +435,13 @@ static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
 long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	struct inode *inode = file_inode(filp);
+	u32 __user *user_attr = (u32 __user *)arg;
 
 	switch (cmd) {
+	case FAT_IOCTL_GET_ATTRIBUTES:
+		return exfat_ioctl_get_attributes(inode, user_attr);
+	case FAT_IOCTL_SET_ATTRIBUTES:
+		return exfat_ioctl_set_attributes(filp, user_attr);
 	case FITRIM:
 		return exfat_ioctl_fitrim(inode, arg);
 	default:
diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c
index a2185e6f054847..875234179d1f61 100644
--- a/fs/exfat/inode.c
+++ b/fs/exfat/inode.c
@@ -400,9 +400,9 @@ static int exfat_write_end(struct file *file, struct address_space *mapping,
 	if (err < len)
 		exfat_write_failed(mapping, pos+len);
 
-	if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
+	if (!(err < 0) && !(ei->attr & EXFAT_ATTR_ARCHIVE)) {
 		inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
-		ei->attr |= ATTR_ARCHIVE;
+		ei->attr |= EXFAT_ATTR_ARCHIVE;
 		mark_inode_dirty(inode);
 	}
 
@@ -550,7 +550,7 @@ static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
 	inode_inc_iversion(inode);
 	inode->i_generation = get_random_u32();
 
-	if (info->attr & ATTR_SUBDIR) { /* directory */
+	if (info->attr & EXFAT_ATTR_SUBDIR) { /* directory */
 		inode->i_generation &= ~1;
 		inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 		inode->i_op = &exfat_dir_inode_operations;
diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
index b92e46916deac8..5d737e0b639a14 100644
--- a/fs/exfat/namei.c
+++ b/fs/exfat/namei.c
@@ -351,14 +351,20 @@ static int exfat_find_empty_entry(struct inode *inode,
 		if (exfat_check_max_dentries(inode))
 			return -ENOSPC;
 
-		/* we trust p_dir->size regardless of FAT type */
-		if (exfat_find_last_cluster(sb, p_dir, &last_clu))
-			return -EIO;
-
 		/*
 		 * Allocate new cluster to this directory
 		 */
-		exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
+		if (ei->start_clu != EXFAT_EOF_CLUSTER) {
+			/* we trust p_dir->size regardless of FAT type */
+			if (exfat_find_last_cluster(sb, p_dir, &last_clu))
+				return -EIO;
+
+			exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
+		} else {
+			/* This directory is empty */
+			exfat_chain_set(&clu, EXFAT_EOF_CLUSTER, 0,
+					ALLOC_NO_FAT_CHAIN);
+		}
 
 		/* allocate a cluster */
 		ret = exfat_alloc_cluster(inode, 1, &clu, IS_DIRSYNC(inode));
@@ -368,6 +374,11 @@ static int exfat_find_empty_entry(struct inode *inode,
 		if (exfat_zeroed_cluster(inode, clu.dir))
 			return -EIO;
 
+		if (ei->start_clu == EXFAT_EOF_CLUSTER) {
+			ei->start_clu = clu.dir;
+			p_dir->dir = clu.dir;
+		}
+
 		/* append to the FAT chain */
 		if (clu.flags != p_dir->flags) {
 			/* no-fat-chain bit is disabled,
@@ -507,7 +518,7 @@ static int exfat_add_entry(struct inode *inode, const char *path,
 		goto out;
 	}
 
-	if (type == TYPE_DIR) {
+	if (type == TYPE_DIR && !sbi->options.zero_size_dir) {
 		ret = exfat_alloc_new_dir(inode, &clu);
 		if (ret)
 			goto out;
@@ -534,13 +545,16 @@ static int exfat_add_entry(struct inode *inode, const char *path,
 	info->type = type;
 
 	if (type == TYPE_FILE) {
-		info->attr = ATTR_ARCHIVE;
+		info->attr = EXFAT_ATTR_ARCHIVE;
 		info->start_clu = EXFAT_EOF_CLUSTER;
 		info->size = 0;
 		info->num_subdirs = 0;
 	} else {
-		info->attr = ATTR_SUBDIR;
-		info->start_clu = start_clu;
+		info->attr = EXFAT_ATTR_SUBDIR;
+		if (sbi->options.zero_size_dir)
+			info->start_clu = EXFAT_EOF_CLUSTER;
+		else
+			info->start_clu = start_clu;
 		info->size = clu_size;
 		info->num_subdirs = EXFAT_MIN_SUBDIR;
 	}
@@ -646,7 +660,7 @@ static int exfat_find(struct inode *dir, struct qstr *qname,
 	info->type = exfat_get_entry_type(ep);
 	info->attr = le16_to_cpu(ep->dentry.file.attr);
 	info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
-	if ((info->type == TYPE_FILE) && (info->size == 0)) {
+	if (info->size == 0) {
 		info->flags = ALLOC_NO_FAT_CHAIN;
 		info->start_clu = EXFAT_EOF_CLUSTER;
 	} else {
@@ -889,6 +903,9 @@ static int exfat_check_dir_empty(struct super_block *sb,
 
 	dentries_per_clu = sbi->dentries_per_clu;
 
+	if (p_dir->dir == EXFAT_EOF_CLUSTER)
+		return 0;
+
 	exfat_chain_dup(&clu, p_dir);
 
 	while (clu.dir != EXFAT_EOF_CLUSTER) {
@@ -1033,8 +1050,8 @@ static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
 
 		*epnew = *epold;
 		if (exfat_get_entry_type(epnew) == TYPE_FILE) {
-			epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
-			ei->attr |= ATTR_ARCHIVE;
+			epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
+			ei->attr |= EXFAT_ATTR_ARCHIVE;
 		}
 		exfat_update_bh(new_bh, sync);
 		brelse(old_bh);
@@ -1065,8 +1082,8 @@ static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
 		ei->entry = newentry;
 	} else {
 		if (exfat_get_entry_type(epold) == TYPE_FILE) {
-			epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
-			ei->attr |= ATTR_ARCHIVE;
+			epold->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
+			ei->attr |= EXFAT_ATTR_ARCHIVE;
 		}
 		exfat_update_bh(old_bh, sync);
 		brelse(old_bh);
@@ -1114,8 +1131,8 @@ static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir,
 
 	*epnew = *epmov;
 	if (exfat_get_entry_type(epnew) == TYPE_FILE) {
-		epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
-		ei->attr |= ATTR_ARCHIVE;
+		epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
+		ei->attr |= EXFAT_ATTR_ARCHIVE;
 	}
 	exfat_update_bh(new_bh, IS_DIRSYNC(inode));
 	brelse(mov_bh);
@@ -1256,7 +1273,8 @@ static int __exfat_rename(struct inode *old_parent_inode,
 		}
 
 		/* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
-		if (new_entry_type == TYPE_DIR) {
+		if (new_entry_type == TYPE_DIR &&
+		    new_ei->start_clu != EXFAT_EOF_CLUSTER) {
 			/* new_ei, new_clu_to_free */
 			struct exfat_chain new_clu_to_free;
 
diff --git a/fs/exfat/super.c b/fs/exfat/super.c
index e919a68bf4a129..d9d4fa91010bb1 100644
--- a/fs/exfat/super.c
+++ b/fs/exfat/super.c
@@ -165,6 +165,8 @@ static int exfat_show_options(struct seq_file *m, struct dentry *root)
 		seq_puts(m, ",sys_tz");
 	else if (opts->time_offset)
 		seq_printf(m, ",time_offset=%d", opts->time_offset);
+	if (opts->zero_size_dir)
+		seq_puts(m, ",zero_size_dir");
 	return 0;
 }
 
@@ -209,6 +211,7 @@ enum {
 	Opt_keep_last_dots,
 	Opt_sys_tz,
 	Opt_time_offset,
+	Opt_zero_size_dir,
 
 	/* Deprecated options */
 	Opt_utf8,
@@ -237,6 +240,7 @@ static const struct fs_parameter_spec exfat_parameters[] = {
 	fsparam_flag("keep_last_dots",		Opt_keep_last_dots),
 	fsparam_flag("sys_tz",			Opt_sys_tz),
 	fsparam_s32("time_offset",		Opt_time_offset),
+	fsparam_flag("zero_size_dir",		Opt_zero_size_dir),
 	__fsparam(NULL, "utf8",			Opt_utf8, fs_param_deprecated,
 		  NULL),
 	__fsparam(NULL, "debug",		Opt_debug, fs_param_deprecated,
@@ -305,6 +309,9 @@ static int exfat_parse_param(struct fs_context *fc, struct fs_parameter *param)
 			return -EINVAL;
 		opts->time_offset = result.int_32;
 		break;
+	case Opt_zero_size_dir:
+		opts->zero_size_dir = true;
+		break;
 	case Opt_utf8:
 	case Opt_debug:
 	case Opt_namecase:
@@ -360,7 +367,7 @@ static int exfat_read_root(struct inode *inode)
 	inode->i_gid = sbi->options.fs_gid;
 	inode_inc_iversion(inode);
 	inode->i_generation = 0;
-	inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, 0777);
+	inode->i_mode = exfat_make_mode(sbi, EXFAT_ATTR_SUBDIR, 0777);
 	inode->i_op = &exfat_dir_inode_operations;
 	inode->i_fop = &exfat_dir_operations;
 
@@ -369,7 +376,7 @@ static int exfat_read_root(struct inode *inode)
 	ei->i_size_aligned = i_size_read(inode);
 	ei->i_size_ondisk = i_size_read(inode);
 
-	exfat_save_attr(inode, ATTR_SUBDIR);
+	exfat_save_attr(inode, EXFAT_ATTR_SUBDIR);
 	ei->i_crtime = simple_inode_init_ts(inode);
 	exfat_truncate_inode_atime(inode);
 	return 0;