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Commit 7ac9fb9c authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Christoph Hellwig
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hfsplus: add per-superblock lock for volume header updates 



Lock updates to the mutal fields in the volume header, and document the
locing in the hfsplus_sb_info structure.

Signed-off-by: default avatarChristoph Hellwig <hch@tuxera.com>
parent 58a818f5

fs/hfsplus/dir.c

+35 −19
Original line number Diff line number Diff line
@@ -251,6 +251,7 @@ static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir, 
	if (HFSPLUS_IS_RSRC(inode))

		return -EPERM;



	mutex_lock(&sbi->vh_mutex);

	if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {

		for (;;) {

			get_random_bytes(&id, sizeof(cnid));
@@ -263,7 +264,7 @@ static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir, 
			if (!res)

				break;

			if (res != -EEXIST)

				return res;

				goto out;

		}

		HFSPLUS_I(inode)->dev = id;

		cnid = sbi->next_cnid++;
@@ -271,13 +272,13 @@ static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir, 
		res = hfsplus_create_cat(cnid, src_dir, &src_dentry->d_name, inode);

		if (res)

			/* panic? */

			return res;

			goto out;

		sbi->file_count++;

	}

	cnid = sbi->next_cnid++;

	res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);

	if (res)

		return res;

		goto out;



	inc_nlink(inode);

	hfsplus_instantiate(dst_dentry, inode, cnid);
@@ -286,8 +287,9 @@ static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir, 
	mark_inode_dirty(inode);

	sbi->file_count++;

	dst_dir->i_sb->s_dirt = 1;



	return 0;

out:

	mutex_unlock(&sbi->vh_mutex);

	return res;

}



static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
@@ -302,6 +304,7 @@ static int hfsplus_unlink(struct inode *dir, struct dentry *dentry) 
	if (HFSPLUS_IS_RSRC(inode))

		return -EPERM;



	mutex_lock(&sbi->vh_mutex);

	cnid = (u32)(unsigned long)dentry->d_fsdata;

	if (inode->i_ino == cnid &&

	    atomic_read(&HFSPLUS_I(inode)->opencnt)) {
@@ -312,11 +315,11 @@ static int hfsplus_unlink(struct inode *dir, struct dentry *dentry) 
					 sbi->hidden_dir, &str);

		if (!res)

			inode->i_flags |= S_DEAD;

		return res;

		goto out;

	}

	res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);

	if (res)

		return res;

		goto out;



	if (inode->i_nlink > 0)

		drop_nlink(inode);
@@ -339,37 +342,44 @@ static int hfsplus_unlink(struct inode *dir, struct dentry *dentry) 
		sbi->file_count--;

	inode->i_ctime = CURRENT_TIME_SEC;

	mark_inode_dirty(inode);



out:

	mutex_unlock(&sbi->vh_mutex);

	return res;

}



static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)

{

	struct inode *inode;

	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);

	struct inode *inode = dentry->d_inode;

	int res;



	inode = dentry->d_inode;

	if (inode->i_size != 2)

		return -ENOTEMPTY;



	mutex_lock(&sbi->vh_mutex);

	res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);

	if (res)

		return res;

		goto out;

	clear_nlink(inode);

	inode->i_ctime = CURRENT_TIME_SEC;

	hfsplus_delete_inode(inode);

	mark_inode_dirty(inode);

	return 0;

out:

	mutex_unlock(&sbi->vh_mutex);

	return res;

}



static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,

			   const char *symname)

{

	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);

	struct inode *inode;

	int res;

	int res = -ENOSPC;



	mutex_lock(&sbi->vh_mutex);

	inode = hfsplus_new_inode(dir->i_sb, S_IFLNK | S_IRWXUGO);

	if (!inode)

		return -ENOSPC;

		goto out;



	res = page_symlink(inode, symname, strlen(symname) + 1);

	if (res)
@@ -381,31 +391,35 @@ static int hfsplus_symlink(struct inode *dir, struct dentry *dentry, 


	hfsplus_instantiate(dentry, inode, inode->i_ino);

	mark_inode_dirty(inode);

	return 0;

	goto out;



out_err:

	inode->i_nlink = 0;

	hfsplus_delete_inode(inode);

	iput(inode);

out:

	mutex_unlock(&sbi->vh_mutex);

	return res;

}



static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,

			 int mode, dev_t rdev)

{

	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);

	struct inode *inode;

	int res;

	int res = -ENOSPC;



	mutex_lock(&sbi->vh_mutex);

	inode = hfsplus_new_inode(dir->i_sb, mode);

	if (!inode)

		return -ENOSPC;

		goto out;



	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);

	if (res) {

		inode->i_nlink = 0;

		hfsplus_delete_inode(inode);

		iput(inode);

		return res;

		goto out;

	}



	if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode))
@@ -413,7 +427,9 @@ static int hfsplus_mknod(struct inode *dir, struct dentry *dentry, 


	hfsplus_instantiate(dentry, inode, inode->i_ino);

	mark_inode_dirty(inode);

	return 0;

out:

	mutex_unlock(&sbi->vh_mutex);

	return res;

}



static int hfsplus_create(struct inode *dir, struct dentry *dentry, int mode,

fs/hfsplus/hfsplus_fs.h

+8 −5
Original line number Diff line number Diff line
@@ -116,23 +116,26 @@ struct hfsplus_sb_info { 
	struct inode *hidden_dir;

	struct nls_table *nls;



	/* synchronize block allocations */

	struct mutex alloc_mutex;



	/* Runtime variables */

	u32 blockoffset;

	u32 sect_count;

	int fs_shift;



	/* Stuff in host order from Vol Header */

	/* immutable data from the volume header */

	u32 alloc_blksz;

	int alloc_blksz_shift;

	u32 total_blocks;

	u32 data_clump_blocks, rsrc_clump_blocks;



	/* mutable data from the volume header, protected by alloc_mutex */

	u32 free_blocks;

	struct mutex alloc_mutex;



	/* mutable data from the volume header, protected by vh_mutex */

	u32 next_cnid;

	u32 file_count;

	u32 folder_count;

	u32 data_clump_blocks, rsrc_clump_blocks;

	struct mutex vh_mutex;



	/* Config options */

	u32 creator;

fs/hfsplus/super.c

+7 −0
Original line number Diff line number Diff line
@@ -160,6 +160,7 @@ int hfsplus_sync_fs(struct super_block *sb, int wait) 


	dprint(DBG_SUPER, "hfsplus_write_super\n");



	mutex_lock(&sbi->vh_mutex);

	mutex_lock(&sbi->alloc_mutex);

	sb->s_dirt = 0;
@@ -194,6 +195,7 @@ int hfsplus_sync_fs(struct super_block *sb, int wait) 
		sbi->flags &= ~HFSPLUS_SB_WRITEBACKUP;

	}

	mutex_unlock(&sbi->alloc_mutex);

	mutex_unlock(&sbi->vh_mutex);

	return 0;

}
@@ -319,6 +321,7 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) 


	sb->s_fs_info = sbi;

	mutex_init(&sbi->alloc_mutex);

	mutex_init(&sbi->vh_mutex);

	hfsplus_fill_defaults(sbi);

	if (!hfsplus_parse_options(data, sbi)) {

		printk(KERN_ERR "hfs: unable to parse mount options\n");
@@ -453,9 +456,13 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) 


	if (!sbi->hidden_dir) {

		printk(KERN_DEBUG "hfs: create hidden dir...\n");



		mutex_lock(&sbi->vh_mutex);

		sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);

		hfsplus_create_cat(sbi->hidden_dir->i_ino, sb->s_root->d_inode,

				   &str, sbi->hidden_dir);

		mutex_unlock(&sbi->vh_mutex);



		mark_inode_dirty(sbi->hidden_dir);

	}

out: