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Commit 4b5397dc authored by Phillip Lougher's avatar Phillip Lougher
Browse files

squashfs: add xattr id support 



This patch adds support for mapping xattr ids (stored in inodes)
into the on-disk location of the xattrs themselves.

Signed-off-by: default avatarPhillip Lougher <phillip@lougher.demon.co.uk>
parent b57f95a3

fs/squashfs/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -5,3 +5,5 @@ 
obj-$(CONFIG_SQUASHFS) += squashfs.o

squashfs-y += block.o cache.o dir.o export.o file.o fragment.o id.o inode.o

squashfs-y += namei.o super.o symlink.o zlib_wrapper.o decompressor.o

squashfs-y += xattr_id.o

fs/squashfs/squashfs.h

+6 −0
Original line number Diff line number Diff line
@@ -73,6 +73,12 @@ extern struct inode *squashfs_iget(struct super_block *, long long, 
				unsigned int);

extern int squashfs_read_inode(struct inode *, long long);



/* xattr_id.c */

extern int squashfs_xattr_lookup(struct super_block *, unsigned int, int *,

				int *, long long *);

extern __le64 *squashfs_read_xattr_id_table(struct super_block *, u64,

				u64 *, int *);



/*

 * Inodes, files and decompressor operations

 */

fs/squashfs/squashfs_fs.h

+31 −1
Original line number Diff line number Diff line
@@ -174,6 +174,24 @@ 


#define SQUASHFS_ID_BLOCK_BYTES(A)	(SQUASHFS_ID_BLOCKS(A) *\

					sizeof(u64))

/* xattr id lookup table defines */

#define SQUASHFS_XATTR_BYTES(A)		((A) * sizeof(struct squashfs_xattr_id))



#define SQUASHFS_XATTR_BLOCK(A)		(SQUASHFS_XATTR_BYTES(A) / \

					SQUASHFS_METADATA_SIZE)



#define SQUASHFS_XATTR_BLOCK_OFFSET(A)	(SQUASHFS_XATTR_BYTES(A) % \

					SQUASHFS_METADATA_SIZE)



#define SQUASHFS_XATTR_BLOCKS(A)	((SQUASHFS_XATTR_BYTES(A) + \

					SQUASHFS_METADATA_SIZE - 1) / \

					SQUASHFS_METADATA_SIZE)



#define SQUASHFS_XATTR_BLOCK_BYTES(A)	(SQUASHFS_XATTR_BLOCKS(A) *\

					sizeof(u64))

#define SQUASHFS_XATTR_BLK(A)		((unsigned int) ((A) >> 16))



#define SQUASHFS_XATTR_OFFSET(A)	((unsigned int) ((A) & 0xffff))



/* cached data constants for filesystem */

#define SQUASHFS_CACHED_BLKS		8
@@ -228,7 +246,7 @@ struct squashfs_super_block { 
	__le64			root_inode;

	__le64			bytes_used;

	__le64			id_table_start;

	__le64			xattr_table_start;

	__le64			xattr_id_table_start;

	__le64			inode_table_start;

	__le64			directory_table_start;

	__le64			fragment_table_start;
@@ -377,4 +395,16 @@ struct squashfs_fragment_entry { 
	unsigned int		unused;

};



struct squashfs_xattr_id {

	__le64			xattr;

	__le32			count;

	__le32			size;

};



struct squashfs_xattr_id_table {

	__le64			xattr_table_start;

	__le32			xattr_ids;

	__le32			unused;

};



#endif

fs/squashfs/squashfs_fs_sb.h

+3 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ struct squashfs_sb_info { 
	int					next_meta_index;

	__le64					*id_table;

	__le64					*fragment_index;

	__le64					*xattr_id_table;

	struct mutex				read_data_mutex;

	struct mutex				meta_index_mutex;

	struct meta_index			*meta_index;
@@ -68,9 +69,11 @@ struct squashfs_sb_info { 
	__le64					*inode_lookup_table;

	u64					inode_table;

	u64					directory_table;

	u64					xattr_table;

	unsigned int				block_size;

	unsigned short				block_log;

	long long				bytes_used;

	unsigned int				inodes;

	int					xattr_ids;

};

#endif

fs/squashfs/super.c

+19 −3
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ 
#include <linux/init.h>

#include <linux/module.h>

#include <linux/magic.h>

#include <linux/xattr.h>



#include "squashfs_fs.h"

#include "squashfs_fs_sb.h"
@@ -82,7 +83,7 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent) 
	long long root_inode;

	unsigned short flags;

	unsigned int fragments;

	u64 lookup_table_start;

	u64 lookup_table_start, xattr_id_table_start;

	int err;



	TRACE("Entered squashfs_fill_superblock\n");
@@ -143,7 +144,7 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent) 
	 * Check if there's xattrs in the filesystem.  These are not

	 * supported in this version, so warn that they will be ignored.

	 */

	if (le64_to_cpu(sblk->xattr_table_start) != SQUASHFS_INVALID_BLK)

	if (le64_to_cpu(sblk->xattr_id_table_start) != SQUASHFS_INVALID_BLK)

		ERROR("Xattrs in filesystem, these will be ignored\n");



	/* Check the filesystem does not extend beyond the end of the
@@ -253,7 +254,7 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent) 
allocate_lookup_table:

	lookup_table_start = le64_to_cpu(sblk->lookup_table_start);

	if (lookup_table_start == SQUASHFS_INVALID_BLK)

		goto allocate_root;

		goto allocate_xattr_table;



	/* Allocate and read inode lookup table */

	msblk->inode_lookup_table = squashfs_read_inode_lookup_table(sb,
@@ -266,6 +267,19 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent) 


	sb->s_export_op = &squashfs_export_ops;



allocate_xattr_table:

	xattr_id_table_start = le64_to_cpu(sblk->xattr_id_table_start);

	if (xattr_id_table_start == SQUASHFS_INVALID_BLK)

		goto allocate_root;



	/* Allocate and read xattr id lookup table */

	msblk->xattr_id_table = squashfs_read_xattr_id_table(sb,

		xattr_id_table_start, &msblk->xattr_table, &msblk->xattr_ids);

	if (IS_ERR(msblk->xattr_id_table)) {

		err = PTR_ERR(msblk->xattr_id_table);

		msblk->xattr_id_table = NULL;

		goto failed_mount;

	}

allocate_root:

	root = new_inode(sb);

	if (!root) {
@@ -301,6 +315,7 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent) 
	kfree(msblk->inode_lookup_table);

	kfree(msblk->fragment_index);

	kfree(msblk->id_table);

	kfree(msblk->xattr_id_table);

	kfree(sb->s_fs_info);

	sb->s_fs_info = NULL;

	kfree(sblk);
@@ -355,6 +370,7 @@ static void squashfs_put_super(struct super_block *sb) 
		kfree(sbi->fragment_index);

		kfree(sbi->meta_index);

		kfree(sbi->inode_lookup_table);

		kfree(sbi->xattr_id_table);

		kfree(sb->s_fs_info);

		sb->s_fs_info = NULL;

	}