summaryrefslogtreecommitdiff
path: root/fs/squashfs
diff options
context:
space:
mode:
Diffstat (limited to 'fs/squashfs')
-rw-r--r--fs/squashfs/Kconfig11
-rw-r--r--fs/squashfs/Makefile2
-rw-r--r--fs/squashfs/inode.c92
-rw-r--r--fs/squashfs/namei.c6
-rw-r--r--fs/squashfs/squashfs.h12
-rw-r--r--fs/squashfs/squashfs_fs.h76
-rw-r--r--fs/squashfs/squashfs_fs_i.h3
-rw-r--r--fs/squashfs/squashfs_fs_sb.h3
-rw-r--r--fs/squashfs/super.c30
-rw-r--r--fs/squashfs/symlink.c11
-rw-r--r--fs/squashfs/xattr.c323
-rw-r--r--fs/squashfs/xattr.h46
-rw-r--r--fs/squashfs/xattr_id.c100
13 files changed, 696 insertions, 19 deletions
diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig
index 25a00d19d68..cc6ce8a84c2 100644
--- a/fs/squashfs/Kconfig
+++ b/fs/squashfs/Kconfig
@@ -26,6 +26,17 @@ config SQUASHFS
If unsure, say N.
+config SQUASHFS_XATTRS
+ bool "Squashfs XATTR support"
+ depends on SQUASHFS
+ default n
+ help
+ Saying Y here includes support for extended attributes (xattrs).
+ Xattrs are name:value pairs associated with inodes by
+ the kernel or by users (see the attr(5) manual page).
+
+ If unsure, say N.
+
config SQUASHFS_EMBEDDED
bool "Additional option for memory-constrained systems"
diff --git a/fs/squashfs/Makefile b/fs/squashfs/Makefile
index df8a19ef870..2cee3e9fa45 100644
--- a/fs/squashfs/Makefile
+++ b/fs/squashfs/Makefile
@@ -5,3 +5,5 @@
obj-$(CONFIG_SQUASHFS) += squashfs.o
squashfs-y += block.o cache.o dir.o export.o file.o fragment.o id.o inode.o
squashfs-y += namei.o super.o symlink.o zlib_wrapper.o decompressor.o
+squashfs-$(CONFIG_SQUASHFS_XATTRS) += xattr.o xattr_id.o
+
diff --git a/fs/squashfs/inode.c b/fs/squashfs/inode.c
index 49daaf669e4..62e63ad2507 100644
--- a/fs/squashfs/inode.c
+++ b/fs/squashfs/inode.c
@@ -40,11 +40,13 @@
#include <linux/fs.h>
#include <linux/vfs.h>
+#include <linux/xattr.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
#include "squashfs_fs_i.h"
#include "squashfs.h"
+#include "xattr.h"
/*
* Initialise VFS inode with the base inode information common to all
@@ -111,6 +113,7 @@ int squashfs_read_inode(struct inode *inode, long long ino)
int err, type, offset = SQUASHFS_INODE_OFFSET(ino);
union squashfs_inode squashfs_ino;
struct squashfs_base_inode *sqshb_ino = &squashfs_ino.base;
+ int xattr_id = SQUASHFS_INVALID_XATTR;
TRACE("Entered squashfs_read_inode\n");
@@ -199,8 +202,10 @@ int squashfs_read_inode(struct inode *inode, long long ino)
frag_offset = 0;
}
+ xattr_id = le32_to_cpu(sqsh_ino->xattr);
inode->i_nlink = le32_to_cpu(sqsh_ino->nlink);
inode->i_size = le64_to_cpu(sqsh_ino->file_size);
+ inode->i_op = &squashfs_inode_ops;
inode->i_fop = &generic_ro_fops;
inode->i_mode |= S_IFREG;
inode->i_blocks = ((inode->i_size -
@@ -251,6 +256,7 @@ int squashfs_read_inode(struct inode *inode, long long ino)
if (err < 0)
goto failed_read;
+ xattr_id = le32_to_cpu(sqsh_ino->xattr);
inode->i_nlink = le32_to_cpu(sqsh_ino->nlink);
inode->i_size = le32_to_cpu(sqsh_ino->file_size);
inode->i_op = &squashfs_dir_inode_ops;
@@ -280,21 +286,33 @@ int squashfs_read_inode(struct inode *inode, long long ino)
inode->i_nlink = le32_to_cpu(sqsh_ino->nlink);
inode->i_size = le32_to_cpu(sqsh_ino->symlink_size);
- inode->i_op = &page_symlink_inode_operations;
+ inode->i_op = &squashfs_symlink_inode_ops;
inode->i_data.a_ops = &squashfs_symlink_aops;
inode->i_mode |= S_IFLNK;
squashfs_i(inode)->start = block;
squashfs_i(inode)->offset = offset;
+ if (type == SQUASHFS_LSYMLINK_TYPE) {
+ __le32 xattr;
+
+ err = squashfs_read_metadata(sb, NULL, &block,
+ &offset, inode->i_size);
+ if (err < 0)
+ goto failed_read;
+ err = squashfs_read_metadata(sb, &xattr, &block,
+ &offset, sizeof(xattr));
+ if (err < 0)
+ goto failed_read;
+ xattr_id = le32_to_cpu(xattr);
+ }
+
TRACE("Symbolic link inode %x:%x, start_block %llx, offset "
"%x\n", SQUASHFS_INODE_BLK(ino), offset,
block, offset);
break;
}
case SQUASHFS_BLKDEV_TYPE:
- case SQUASHFS_CHRDEV_TYPE:
- case SQUASHFS_LBLKDEV_TYPE:
- case SQUASHFS_LCHRDEV_TYPE: {
+ case SQUASHFS_CHRDEV_TYPE: {
struct squashfs_dev_inode *sqsh_ino = &squashfs_ino.dev;
unsigned int rdev;
@@ -315,10 +333,32 @@ int squashfs_read_inode(struct inode *inode, long long ino)
SQUASHFS_INODE_BLK(ino), offset, rdev);
break;
}
+ case SQUASHFS_LBLKDEV_TYPE:
+ case SQUASHFS_LCHRDEV_TYPE: {
+ struct squashfs_ldev_inode *sqsh_ino = &squashfs_ino.ldev;
+ unsigned int rdev;
+
+ err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
+ sizeof(*sqsh_ino));
+ if (err < 0)
+ goto failed_read;
+
+ if (type == SQUASHFS_LCHRDEV_TYPE)
+ inode->i_mode |= S_IFCHR;
+ else
+ inode->i_mode |= S_IFBLK;
+ xattr_id = le32_to_cpu(sqsh_ino->xattr);
+ inode->i_op = &squashfs_inode_ops;
+ inode->i_nlink = le32_to_cpu(sqsh_ino->nlink);
+ rdev = le32_to_cpu(sqsh_ino->rdev);
+ init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
+
+ TRACE("Device inode %x:%x, rdev %x\n",
+ SQUASHFS_INODE_BLK(ino), offset, rdev);
+ break;
+ }
case SQUASHFS_FIFO_TYPE:
- case SQUASHFS_SOCKET_TYPE:
- case SQUASHFS_LFIFO_TYPE:
- case SQUASHFS_LSOCKET_TYPE: {
+ case SQUASHFS_SOCKET_TYPE: {
struct squashfs_ipc_inode *sqsh_ino = &squashfs_ino.ipc;
err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
@@ -334,14 +374,52 @@ int squashfs_read_inode(struct inode *inode, long long ino)
init_special_inode(inode, inode->i_mode, 0);
break;
}
+ case SQUASHFS_LFIFO_TYPE:
+ case SQUASHFS_LSOCKET_TYPE: {
+ struct squashfs_lipc_inode *sqsh_ino = &squashfs_ino.lipc;
+
+ err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
+ sizeof(*sqsh_ino));
+ if (err < 0)
+ goto failed_read;
+
+ if (type == SQUASHFS_LFIFO_TYPE)
+ inode->i_mode |= S_IFIFO;
+ else
+ inode->i_mode |= S_IFSOCK;
+ xattr_id = le32_to_cpu(sqsh_ino->xattr);
+ inode->i_op = &squashfs_inode_ops;
+ inode->i_nlink = le32_to_cpu(sqsh_ino->nlink);
+ init_special_inode(inode, inode->i_mode, 0);
+ break;
+ }
default:
ERROR("Unknown inode type %d in squashfs_iget!\n", type);
return -EINVAL;
}
+ if (xattr_id != SQUASHFS_INVALID_XATTR && msblk->xattr_id_table) {
+ err = squashfs_xattr_lookup(sb, xattr_id,
+ &squashfs_i(inode)->xattr_count,
+ &squashfs_i(inode)->xattr_size,
+ &squashfs_i(inode)->xattr);
+ if (err < 0)
+ goto failed_read;
+ inode->i_blocks += ((squashfs_i(inode)->xattr_size - 1) >> 9)
+ + 1;
+ } else
+ squashfs_i(inode)->xattr_count = 0;
+
return 0;
failed_read:
ERROR("Unable to read inode 0x%llx\n", ino);
return err;
}
+
+
+const struct inode_operations squashfs_inode_ops = {
+ .getxattr = generic_getxattr,
+ .listxattr = squashfs_listxattr
+};
+
diff --git a/fs/squashfs/namei.c b/fs/squashfs/namei.c
index 5266bd8ad93..7a9464d08cf 100644
--- a/fs/squashfs/namei.c
+++ b/fs/squashfs/namei.c
@@ -57,11 +57,13 @@
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/dcache.h>
+#include <linux/xattr.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
#include "squashfs_fs_i.h"
#include "squashfs.h"
+#include "xattr.h"
/*
* Lookup name in the directory index, returning the location of the metadata
@@ -237,5 +239,7 @@ failed:
const struct inode_operations squashfs_dir_inode_ops = {
- .lookup = squashfs_lookup
+ .lookup = squashfs_lookup,
+ .getxattr = generic_getxattr,
+ .listxattr = squashfs_listxattr
};
diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h
index fe2587af551..733a17c4294 100644
--- a/fs/squashfs/squashfs.h
+++ b/fs/squashfs/squashfs.h
@@ -73,8 +73,11 @@ extern struct inode *squashfs_iget(struct super_block *, long long,
unsigned int);
extern int squashfs_read_inode(struct inode *, long long);
+/* xattr.c */
+extern ssize_t squashfs_listxattr(struct dentry *, char *, size_t);
+
/*
- * Inodes, files and decompressor operations
+ * Inodes, files, decompressor and xattr operations
*/
/* dir.c */
@@ -86,11 +89,18 @@ extern const struct export_operations squashfs_export_ops;
/* file.c */
extern const struct address_space_operations squashfs_aops;
+/* inode.c */
+extern const struct inode_operations squashfs_inode_ops;
+
/* namei.c */
extern const struct inode_operations squashfs_dir_inode_ops;
/* symlink.c */
extern const struct address_space_operations squashfs_symlink_aops;
+extern const struct inode_operations squashfs_symlink_inode_ops;
+
+/* xattr.c */
+extern const struct xattr_handler *squashfs_xattr_handlers[];
/* zlib_wrapper.c */
extern const struct squashfs_decompressor squashfs_zlib_comp_ops;
diff --git a/fs/squashfs/squashfs_fs.h b/fs/squashfs/squashfs_fs.h
index 79024245ea0..8eabb808b78 100644
--- a/fs/squashfs/squashfs_fs.h
+++ b/fs/squashfs/squashfs_fs.h
@@ -46,6 +46,7 @@
#define SQUASHFS_NAME_LEN 256
#define SQUASHFS_INVALID_FRAG (0xffffffffU)
+#define SQUASHFS_INVALID_XATTR (0xffffffffU)
#define SQUASHFS_INVALID_BLK (-1LL)
/* Filesystem flags */
@@ -96,6 +97,13 @@
#define SQUASHFS_LFIFO_TYPE 13
#define SQUASHFS_LSOCKET_TYPE 14
+/* Xattr types */
+#define SQUASHFS_XATTR_USER 0
+#define SQUASHFS_XATTR_TRUSTED 1
+#define SQUASHFS_XATTR_SECURITY 2
+#define SQUASHFS_XATTR_VALUE_OOL 256
+#define SQUASHFS_XATTR_PREFIX_MASK 0xff
+
/* Flag whether block is compressed or uncompressed, bit is set if block is
* uncompressed */
#define SQUASHFS_COMPRESSED_BIT (1 << 15)
@@ -174,6 +182,24 @@
#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 +254,7 @@ 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;
@@ -261,6 +287,17 @@ struct squashfs_ipc_inode {
__le32 nlink;
};
+struct squashfs_lipc_inode {
+ __le16 inode_type;
+ __le16 mode;
+ __le16 uid;
+ __le16 guid;
+ __le32 mtime;
+ __le32 inode_number;
+ __le32 nlink;
+ __le32 xattr;
+};
+
struct squashfs_dev_inode {
__le16 inode_type;
__le16 mode;
@@ -272,6 +309,18 @@ struct squashfs_dev_inode {
__le32 rdev;
};
+struct squashfs_ldev_inode {
+ __le16 inode_type;
+ __le16 mode;
+ __le16 uid;
+ __le16 guid;
+ __le32 mtime;
+ __le32 inode_number;
+ __le32 nlink;
+ __le32 rdev;
+ __le32 xattr;
+};
+
struct squashfs_symlink_inode {
__le16 inode_type;
__le16 mode;
@@ -349,12 +398,14 @@ struct squashfs_ldir_inode {
union squashfs_inode {
struct squashfs_base_inode base;
struct squashfs_dev_inode dev;
+ struct squashfs_ldev_inode ldev;
struct squashfs_symlink_inode symlink;
struct squashfs_reg_inode reg;
struct squashfs_lreg_inode lreg;
struct squashfs_dir_inode dir;
struct squashfs_ldir_inode ldir;
struct squashfs_ipc_inode ipc;
+ struct squashfs_lipc_inode lipc;
};
struct squashfs_dir_entry {
@@ -377,4 +428,27 @@ struct squashfs_fragment_entry {
unsigned int unused;
};
+struct squashfs_xattr_entry {
+ __le16 type;
+ __le16 size;
+ char data[0];
+};
+
+struct squashfs_xattr_val {
+ __le32 vsize;
+ char value[0];
+};
+
+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
diff --git a/fs/squashfs/squashfs_fs_i.h b/fs/squashfs/squashfs_fs_i.h
index fbfca30c0c6..d3e3a37f28a 100644
--- a/fs/squashfs/squashfs_fs_i.h
+++ b/fs/squashfs/squashfs_fs_i.h
@@ -26,6 +26,9 @@
struct squashfs_inode_info {
u64 start;
int offset;
+ u64 xattr;
+ unsigned int xattr_size;
+ int xattr_count;
union {
struct {
u64 fragment_block;
diff --git a/fs/squashfs/squashfs_fs_sb.h b/fs/squashfs/squashfs_fs_sb.h
index 2e77dc547e2..d9037a5215f 100644
--- a/fs/squashfs/squashfs_fs_sb.h
+++ b/fs/squashfs/squashfs_fs_sb.h
@@ -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
diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index 48b6f4a385a..88b4f860665 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -36,12 +36,14 @@
#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"
#include "squashfs_fs_i.h"
#include "squashfs.h"
#include "decompressor.h"
+#include "xattr.h"
static struct file_system_type squashfs_fs_type;
static const struct super_operations squashfs_super_ops;
@@ -82,7 +84,7 @@ 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");
@@ -139,13 +141,6 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
if (msblk->decompressor == NULL)
goto failed_mount;
- /*
- * 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)
- ERROR("Xattrs in filesystem, these will be ignored\n");
-
/* Check the filesystem does not extend beyond the end of the
block device */
msblk->bytes_used = le64_to_cpu(sblk->bytes_used);
@@ -253,7 +248,7 @@ 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 +261,21 @@ allocate_lookup_table:
sb->s_export_op = &squashfs_export_ops;
+allocate_xattr_table:
+ sb->s_xattr = squashfs_xattr_handlers;
+ 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;
+ if (err != -ENOTSUPP)
+ goto failed_mount;
+ }
allocate_root:
root = new_inode(sb);
if (!root) {
@@ -301,6 +311,7 @@ failed_mount:
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 +366,7 @@ 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;
}
diff --git a/fs/squashfs/symlink.c b/fs/squashfs/symlink.c
index 32b911f4ee3..ec86434921e 100644
--- a/fs/squashfs/symlink.c
+++ b/fs/squashfs/symlink.c
@@ -35,11 +35,13 @@
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/pagemap.h>
+#include <linux/xattr.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
#include "squashfs_fs_i.h"
#include "squashfs.h"
+#include "xattr.h"
static int squashfs_symlink_readpage(struct file *file, struct page *page)
{
@@ -114,3 +116,12 @@ error_out:
const struct address_space_operations squashfs_symlink_aops = {
.readpage = squashfs_symlink_readpage
};
+
+const struct inode_operations squashfs_symlink_inode_ops = {
+ .readlink = generic_readlink,
+ .follow_link = page_follow_link_light,
+ .put_link = page_put_link,
+ .getxattr = generic_getxattr,
+ .listxattr = squashfs_listxattr
+};
+
diff --git a/fs/squashfs/xattr.c b/fs/squashfs/xattr.c
new file mode 100644
index 00000000000..c7655e8b31c
--- /dev/null
+++ b/fs/squashfs/xattr.c
@@ -0,0 +1,323 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2010
+ * Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * xattr_id.c
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/vfs.h>
+#include <linux/xattr.h>
+#include <linux/slab.h>
+
+#include "squashfs_fs.h"
+#include "squashfs_fs_sb.h"
+#include "squashfs_fs_i.h"
+#include "squashfs.h"
+
+static const struct xattr_handler *squashfs_xattr_handler(int);
+
+ssize_t squashfs_listxattr(struct dentry *d, char *buffer,
+ size_t buffer_size)
+{
+ struct inode *inode = d->d_inode;
+ struct super_block *sb = inode->i_sb;
+ struct squashfs_sb_info *msblk = sb->s_fs_info;
+ u64 start = SQUASHFS_XATTR_BLK(squashfs_i(inode)->xattr)
+ + msblk->xattr_table;
+ int offset = SQUASHFS_XATTR_OFFSET(squashfs_i(inode)->xattr);
+ int count = squashfs_i(inode)->xattr_count;
+ size_t rest = buffer_size;
+ int err;
+
+ /* check that the file system has xattrs */
+ if (msblk->xattr_id_table == NULL)
+ return -EOPNOTSUPP;
+
+ /* loop reading each xattr name */
+ while (count--) {
+ struct squashfs_xattr_entry entry;
+ struct squashfs_xattr_val val;
+ const struct xattr_handler *handler;
+ int name_size, prefix_size = 0;
+
+ err = squashfs_read_metadata(sb, &entry, &start, &offset,
+ sizeof(entry));
+ if (err < 0)
+ goto failed;
+
+ name_size = le16_to_cpu(entry.size);
+ handler = squashfs_xattr_handler(le16_to_cpu(entry.type));
+ if (handler)
+ prefix_size = handler->list(d, buffer, rest, NULL,
+ name_size, handler->flags);
+ if (prefix_size) {
+ if (buffer) {
+ if (prefix_size + name_size + 1 > rest) {
+ err = -ERANGE;
+ goto failed;
+ }
+ buffer += prefix_size;
+ }
+ err = squashfs_read_metadata(sb, buffer, &start,
+ &offset, name_size);
+ if (err < 0)
+ goto failed;
+ if (buffer) {
+ buffer[name_size] = '\0';
+ buffer += name_size + 1;
+ }
+ rest -= prefix_size + name_size + 1;
+ } else {
+ /* no handler or insuffficient privileges, so skip */
+ err = squashfs_read_metadata(sb, NULL, &start,
+ &offset, name_size);
+ if (err < 0)
+ goto failed;
+ }
+
+
+ /* skip remaining xattr entry */
+ err = squashfs_read_metadata(sb, &val, &start, &offset,
+ sizeof(val));
+ if (err < 0)
+ goto failed;
+
+ err = squashfs_read_metadata(sb, NULL, &start, &offset,
+ le32_to_cpu(val.vsize));
+ if (err < 0)
+ goto failed;
+ }
+ err = buffer_size - rest;
+
+failed:
+ return err;
+}
+
+
+static int squashfs_xattr_get(struct inode *inode, int name_index,
+ const char *name, void *buffer, size_t buffer_size)
+{
+ struct super_block *sb = inode->i_sb;
+ struct squashfs_sb_info *msblk = sb->s_fs_info;
+ u64 start = SQUASHFS_XATTR_BLK(squashfs_i(inode)->xattr)
+ + msblk->xattr_table;
+ int offset = SQUASHFS_XATTR_OFFSET(squashfs_i(inode)->xattr);
+ int count = squashfs_i(inode)->xattr_count;
+ int name_len = strlen(name);
+ int err, vsize;
+ char *target = kmalloc(name_len, GFP_KERNEL);
+
+ if (target == NULL)
+ return -ENOMEM;
+
+ /* loop reading each xattr name */
+ for (; count; count--) {
+ struct squashfs_xattr_entry entry;
+ struct squashfs_xattr_val val;
+ int type, prefix, name_size;
+
+ err = squashfs_read_metadata(sb, &entry, &start, &offset,
+ sizeof(entry));
+ if (err < 0)
+ goto failed;
+
+ name_size = le16_to_cpu(entry.size);
+ type = le16_to_cpu(entry.type);
+ prefix = type & SQUASHFS_XATTR_PREFIX_MASK;
+
+ if (prefix == name_index && name_size == name_len)
+ err = squashfs_read_metadata(sb, target, &start,
+ &offset, name_size);
+ else
+ err = squashfs_read_metadata(sb, NULL, &start,
+ &offset, name_size);
+ if (err < 0)
+ goto failed;
+
+ if (prefix == name_index && name_size == name_len &&
+ strncmp(target, name, name_size) == 0) {
+ /* found xattr */
+ if (type & SQUASHFS_XATTR_VALUE_OOL) {
+ __le64 xattr;
+ /* val is a reference to the real location */
+ err = squashfs_read_metadata(sb, &val, &start,
+ &offset, sizeof(val));
+ if (err < 0)
+ goto failed;
+ err = squashfs_read_metadata(sb, &xattr, &start,
+ &offset, sizeof(xattr));
+ if (err < 0)
+ goto failed;
+ xattr = le64_to_cpu(xattr);
+ start = SQUASHFS_XATTR_BLK(xattr) +
+ msblk->xattr_table;
+ offset = SQUASHFS_XATTR_OFFSET(xattr);
+ }
+ /* read xattr value */
+ err = squashfs_read_metadata(sb, &val, &start, &offset,
+ sizeof(val));
+ if (err < 0)
+ goto failed;
+
+ vsize = le32_to_cpu(val.vsize);
+ if (buffer) {
+ if (vsize > buffer_size) {
+ err = -ERANGE;
+ goto failed;
+ }
+ err = squashfs_read_metadata(sb, buffer, &start,
+ &offset, vsize);
+ if (err < 0)
+ goto failed;
+ }
+ break;
+ }
+
+ /* no match, skip remaining xattr entry */
+ err = squashfs_read_metadata(sb, &val, &start, &offset,
+ sizeof(val));
+ if (err < 0)
+ goto failed;
+ err = squashfs_read_metadata(sb, NULL, &start, &offset,
+ le32_to_cpu(val.vsize));
+ if (err < 0)
+ goto failed;
+ }
+ err = count ? vsize : -ENODATA;
+
+failed:
+ kfree(target);
+ return err;
+}
+
+
+/*
+ * User namespace support
+ */
+static size_t squashfs_user_list(struct dentry *d, char *list, size_t list_size,
+ const char *name, size_t name_len, int type)
+{
+ if (list && XATTR_USER_PREFIX_LEN <= list_size)
+ memcpy(list, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
+ return XATTR_USER_PREFIX_LEN;
+}
+
+static int squashfs_user_get(struct dentry *d, const char *name, void *buffer,
+ size_t size, int type)
+{
+ if (name[0] == '\0')
+ return -EINVAL;
+
+ return squashfs_xattr_get(d->d_inode, SQUASHFS_XATTR_USER, name,
+ buffer, size);
+}
+
+static const struct xattr_handler squashfs_xattr_user_handler = {
+ .prefix = XATTR_USER_PREFIX,
+ .list = squashfs_user_list,
+ .get = squashfs_user_get
+};
+
+/*
+ * Trusted namespace support
+ */
+static size_t squashfs_trusted_list(struct dentry *d, char *list,
+ size_t list_size, const char *name, size_t name_len, int type)
+{
+ if (!capable(CAP_SYS_ADMIN))
+ return 0;
+
+ if (list && XATTR_TRUSTED_PREFIX_LEN <= list_size)
+ memcpy(list, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN);
+ return XATTR_TRUSTED_PREFIX_LEN;
+}
+
+static int squashfs_trusted_get(struct dentry *d, const char *name,
+ void *buffer, size_t size, int type)
+{
+ if (name[0] == '\0')
+ return -EINVAL;
+
+ return squashfs_xattr_get(d->d_inode, SQUASHFS_XATTR_TRUSTED, name,
+ buffer, size);
+}
+
+static const struct xattr_handler squashfs_xattr_trusted_handler = {
+ .prefix = XATTR_TRUSTED_PREFIX,
+ .list = squashfs_trusted_list,
+ .get = squashfs_trusted_get
+};
+
+/*
+ * Security namespace support
+ */
+static size_t squashfs_security_list(struct dentry *d, char *list,
+ size_t list_size, const char *name, size_t name_len, int type)
+{
+ if (list && XATTR_SECURITY_PREFIX_LEN <= list_size)
+ memcpy(list, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN);
+ return XATTR_SECURITY_PREFIX_LEN;
+}
+
+static int squashfs_security_get(struct dentry *d, const char *name,
+ void *buffer, size_t size, int type)
+{
+ if (name[0] == '\0')
+ return -EINVAL;
+
+ return squashfs_xattr_get(d->d_inode, SQUASHFS_XATTR_SECURITY, name,
+ buffer, size);
+}
+
+static const struct xattr_handler squashfs_xattr_security_handler = {
+ .prefix = XATTR_SECURITY_PREFIX,
+ .list = squashfs_security_list,
+ .get = squashfs_security_get
+};
+
+static inline const struct xattr_handler *squashfs_xattr_handler(int type)
+{
+ if (type & ~(SQUASHFS_XATTR_PREFIX_MASK | SQUASHFS_XATTR_VALUE_OOL))
+ /* ignore unrecognised type */
+ return NULL;
+
+ switch (type & SQUASHFS_XATTR_PREFIX_MASK) {
+ case SQUASHFS_XATTR_USER:
+ return &squashfs_xattr_user_handler;
+ case SQUASHFS_XATTR_TRUSTED:
+ return &squashfs_xattr_trusted_handler;
+ case SQUASHFS_XATTR_SECURITY:
+ return &squashfs_xattr_security_handler;
+ default:
+ /* ignore unrecognised type */
+ return NULL;
+ }
+}
+
+const struct xattr_handler *squashfs_xattr_handlers[] = {
+ &squashfs_xattr_user_handler,
+ &squashfs_xattr_trusted_handler,
+ &squashfs_xattr_security_handler,
+ NULL
+};
+
diff --git a/fs/squashfs/xattr.h b/fs/squashfs/xattr.h
new file mode 100644
index 00000000000..9da071ae181
--- /dev/null
+++ b/fs/squashfs/xattr.h
@@ -0,0 +1,46 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2010
+ * Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * xattr.h
+ */
+
+#ifdef CONFIG_SQUASHFS_XATTRS
+extern __le64 *squashfs_read_xattr_id_table(struct super_block *, u64,
+ u64 *, int *);
+extern int squashfs_xattr_lookup(struct super_block *, unsigned int, int *,
+ int *, unsigned long long *);
+#else
+static inline __le64 *squashfs_read_xattr_id_table(struct super_block *sb,
+ u64 start, u64 *xattr_table_start, int *xattr_ids)
+{
+ ERROR("Xattrs in filesystem, these will be ignored\n");
+ return ERR_PTR(-ENOTSUPP);
+}
+
+static inline int squashfs_xattr_lookup(struct super_block *sb,
+ unsigned int index, int *count, int *size,
+ unsigned long long *xattr)
+{
+ return 0;
+}
+#define squashfs_listxattr NULL
+#define generic_getxattr NULL
+#define squashfs_xattr_handlers NULL
+#endif
diff --git a/fs/squashfs/xattr_id.c b/fs/squashfs/xattr_id.c
new file mode 100644
index 00000000000..cfb41106098
--- /dev/null
+++ b/fs/squashfs/xattr_id.c
@@ -0,0 +1,100 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2010
+ * Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * xattr_id.c
+ */
+
+/*
+ * This file implements code to map the 32-bit xattr id stored in the inode
+ * into the on disk location of the xattr data.
+ */
+
+#include <linux/fs.h>
+#include <linux/vfs.h>
+#include <linux/slab.h>
+
+#include "squashfs_fs.h"
+#include "squashfs_fs_sb.h"
+#include "squashfs_fs_i.h"
+#include "squashfs.h"
+
+/*
+ * Map xattr id using the xattr id look up table
+ */
+int squashfs_xattr_lookup(struct super_block *sb, unsigned int index,
+ int *count, unsigned int *size, unsigned long long *xattr)
+{
+ struct squashfs_sb_info *msblk = sb->s_fs_info;
+ int block = SQUASHFS_XATTR_BLOCK(index);
+ int offset = SQUASHFS_XATTR_BLOCK_OFFSET(index);
+ u64 start_block = le64_to_cpu(msblk->xattr_id_table[block]);
+ struct squashfs_xattr_id id;
+ int err;
+
+ err = squashfs_read_metadata(sb, &id, &start_block, &offset,
+ sizeof(id));
+ if (err < 0)
+ return err;
+
+ *xattr = le64_to_cpu(id.xattr);
+ *size = le32_to_cpu(id.size);
+ *count = le32_to_cpu(id.count);
+ return 0;
+}
+
+
+/*
+ * Read uncompressed xattr id lookup table indexes from disk into memory
+ */
+__le64 *squashfs_read_xattr_id_table(struct super_block *sb, u64 start,
+ u64 *xattr_table_start, int *xattr_ids)
+{
+ unsigned int len;
+ __le64 *xid_table;
+ struct squashfs_xattr_id_table id_table;
+ int err;
+
+ err = squashfs_read_table(sb, &id_table, start, sizeof(id_table));
+ if (err < 0) {
+ ERROR("unable to read xattr id table\n");
+ return ERR_PTR(err);
+ }
+ *xattr_table_start = le64_to_cpu(id_table.xattr_table_start);
+ *xattr_ids = le32_to_cpu(id_table.xattr_ids);
+ len = SQUASHFS_XATTR_BLOCK_BYTES(*xattr_ids);
+
+ TRACE("In read_xattr_index_table, length %d\n", len);
+
+ /* Allocate xattr id lookup table indexes */
+ xid_table = kmalloc(len, GFP_KERNEL);
+ if (xid_table == NULL) {
+ ERROR("Failed to allocate xattr id index table\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ err = squashfs_read_table(sb, xid_table, start + sizeof(id_table), len);
+ if (err < 0) {
+ ERROR("unable to read xattr id index table\n");
+ kfree(xid_table);
+ return ERR_PTR(err);
+ }
+
+ return xid_table;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-14 16:10:20 +0000