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Commit 0b1a6a8c authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
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[PATCH] reiserfs: xattr support 

From: Chris Mason <mason@suse.com>

From: jeffm@suse.com

reiserfs support for xattrs
parent 06803e35
Hide whitespace changes
Inline Side-by-side
Showing with 1753 additions and 53 deletions
fs/Kconfig
View file @ 0b1a6a8c
......@@ -244,6 +244,16 @@ config REISERFS_PROC_INFO
Almost everyone but ReiserFS developers and people fine-tuning
reiserfs or tracing problems should say N.
config REISERFS_FS_XATTR
bool "ReiserFS extended attributes"
depends on REISERFS_FS
help
Extended attributes are name:value pairs associated with inodes by
the kernel or by users (see the attr(5) manual page, or visit
<http://acl.bestbits.at/> for details).
If unsure, say N.
config JFS_FS
tristate "JFS filesystem support"
select NLS
......
fs/reiserfs/Makefile
View file @ 0b1a6a8c
......@@ -9,6 +9,10 @@ reiserfs-objs := bitmap.o do_balan.o namei.o inode.o file.o dir.o fix_node.o \
hashes.o tail_conversion.o journal.o resize.o \
item_ops.o ioctl.o procfs.o
ifeq ($(CONFIG_REISERFS_FS_XATTR),y)
reiserfs-objs += xattr.o xattr_user.o
endif
# gcc -O2 (the kernel default) is overaggressive on ppc32 when many inline
# functions are used. This causes the compiler to advance the stack
# pointer out of the available stack space, corrupting kernel space,
......
fs/reiserfs/dir.c
View file @ 0b1a6a8c
......@@ -115,6 +115,17 @@ static int reiserfs_readdir (struct file * filp, void * dirent, filldir_t filldi
/* too big to send back to VFS */
continue ;
}
/* Ignore the .reiserfs_priv entry */
if (reiserfs_xattrs (inode->i_sb) &&
!old_format_only(inode->i_sb) &&
filp->f_dentry == inode->i_sb->s_root &&
REISERFS_SB(inode->i_sb)->priv_root &&
REISERFS_SB(inode->i_sb)->priv_root->d_inode &&
deh_objectid(deh) == le32_to_cpu (INODE_PKEY(REISERFS_SB(inode->i_sb)->priv_root->d_inode)->k_objectid)) {
continue;
}
d_off = deh_offset (deh);
filp->f_pos = d_off ;
d_ino = deh_objectid (deh);
......
fs/reiserfs/file.c
View file @ 0b1a6a8c
......@@ -5,6 +5,7 @@
#include <linux/time.h>
#include <linux/reiserfs_fs.h>
#include <linux/reiserfs_xattr.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <linux/pagemap.h>
......@@ -97,51 +98,6 @@ static int reiserfs_sync_file(
return ( n_err < 0 ) ? -EIO : 0;
}
static int reiserfs_setattr(struct dentry *dentry, struct iattr *attr) {
struct inode *inode = dentry->d_inode ;
int error ;
reiserfs_write_lock(inode->i_sb);
if (attr->ia_valid & ATTR_SIZE) {
/* version 2 items will be caught by the s_maxbytes check
** done for us in vmtruncate
*/
if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
attr->ia_size > MAX_NON_LFS) {
error = -EFBIG ;
goto out;
}
/* fill in hole pointers in the expanding truncate case. */
if (attr->ia_size > inode->i_size) {
error = generic_cont_expand(inode, attr->ia_size) ;
if (REISERFS_I(inode)->i_prealloc_count > 0) {
struct reiserfs_transaction_handle th ;
/* we're changing at most 2 bitmaps, inode + super */
journal_begin(&th, inode->i_sb, 4) ;
reiserfs_discard_prealloc (&th, inode);
journal_end(&th, inode->i_sb, 4) ;
}
if (error)
goto out;
}
}
if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
(get_inode_sd_version (inode) == STAT_DATA_V1)) {
/* stat data of format v3.5 has 16 bit uid and gid */
error = -EINVAL;
goto out;
}
error = inode_change_ok(inode, attr) ;
if (!error)
inode_setattr(inode, attr) ;
out:
reiserfs_write_unlock(inode->i_sb);
return error ;
}
/* I really do not want to play with memory shortage right now, so
to simplify the code, we are not going to write more than this much pages at
a time. This still should considerably improve performance compared to 4k
......@@ -1321,6 +1277,11 @@ struct file_operations reiserfs_file_operations = {
struct inode_operations reiserfs_file_inode_operations = {
.truncate = reiserfs_vfs_truncate_file,
.setattr = reiserfs_setattr,
.setxattr = reiserfs_setxattr,
.getxattr = reiserfs_getxattr,
.listxattr = reiserfs_listxattr,
.removexattr = reiserfs_removexattr,
.permission = reiserfs_permission,
};
fs/reiserfs/inode.c
View file @ 0b1a6a8c
......@@ -5,6 +5,7 @@
#include <linux/config.h>
#include <linux/time.h>
#include <linux/reiserfs_fs.h>
#include <linux/reiserfs_xattr.h>
#include <linux/smp_lock.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
......@@ -13,6 +14,7 @@
#include <linux/buffer_head.h>
#include <linux/mpage.h>
#include <linux/writeback.h>
#include <linux/quotaops.h>
extern int reiserfs_default_io_size; /* default io size devuned in super.c */
......@@ -40,6 +42,8 @@ void reiserfs_delete_inode (struct inode * inode)
if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
down (&inode->i_sem);
reiserfs_delete_xattrs (inode);
journal_begin(&th, inode->i_sb, jbegin_count) ;
reiserfs_update_inode_transaction(inode) ;
......@@ -1053,10 +1057,11 @@ static void init_inode (struct inode * inode, struct path * path)
inode->i_op = &reiserfs_dir_inode_operations;
inode->i_fop = &reiserfs_dir_operations;
} else if (S_ISLNK (inode->i_mode)) {
inode->i_op = &page_symlink_inode_operations;
inode->i_op = &reiserfs_symlink_inode_operations;
inode->i_mapping->a_ops = &reiserfs_address_space_operations;
} else {
inode->i_blocks = 0;
inode->i_op = &reiserfs_special_inode_operations;
init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
}
}
......@@ -2509,6 +2514,64 @@ static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
}
int reiserfs_setattr(struct dentry *dentry, struct iattr *attr) {
struct inode *inode = dentry->d_inode ;
int error ;
unsigned int ia_valid = attr->ia_valid;
reiserfs_write_lock(inode->i_sb);
if (attr->ia_valid & ATTR_SIZE) {
/* version 2 items will be caught by the s_maxbytes check
** done for us in vmtruncate
*/
if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
attr->ia_size > MAX_NON_LFS) {
error = -EFBIG ;
goto out;
}
/* fill in hole pointers in the expanding truncate case. */
if (attr->ia_size > inode->i_size) {
error = generic_cont_expand(inode, attr->ia_size) ;
if (REISERFS_I(inode)->i_prealloc_count > 0) {
struct reiserfs_transaction_handle th ;
/* we're changing at most 2 bitmaps, inode + super */
journal_begin(&th, inode->i_sb, 4) ;
reiserfs_discard_prealloc (&th, inode);
journal_end(&th, inode->i_sb, 4) ;
}
if (error)
goto out;
}
}
if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
(get_inode_sd_version (inode) == STAT_DATA_V1)) {
/* stat data of format v3.5 has 16 bit uid and gid */
error = -EINVAL;
goto out;
}
error = inode_change_ok(inode, attr) ;
if (!error) {
if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
(ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
error = reiserfs_chown_xattrs (inode, attr);
if (!error)
error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
}
if (!error)
inode_setattr(inode, attr) ;
}
out:
reiserfs_write_unlock(inode->i_sb);
return error ;
}
struct address_space_operations reiserfs_address_space_operations = {
.writepage = reiserfs_writepage,
.readpage = reiserfs_readpage,
......
fs/reiserfs/namei.c
View file @ 0b1a6a8c
......@@ -15,6 +15,7 @@
#include <linux/time.h>
#include <linux/bitops.h>
#include <linux/reiserfs_fs.h>
#include <linux/reiserfs_xattr.h>
#include <linux/smp_lock.h>
#define INC_DIR_INODE_NLINK(i) if (i->i_nlink != 1) { i->i_nlink++; if (i->i_nlink >= REISERFS_LINK_MAX) i->i_nlink=1; }
......@@ -331,11 +332,24 @@ static struct dentry * reiserfs_lookup (struct inode * dir, struct dentry * dent
retval = reiserfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &path_to_entry, &de);
pathrelse (&path_to_entry);
if (retval == NAME_FOUND) {
/* Hide the .reiserfs_priv directory */
if (reiserfs_xattrs (dir->i_sb) &&
!old_format_only(dir->i_sb) &&
REISERFS_SB(dir->i_sb)->priv_root &&
REISERFS_SB(dir->i_sb)->priv_root->d_inode &&
de.de_objectid == le32_to_cpu (INODE_PKEY(REISERFS_SB(dir->i_sb)->priv_root->d_inode)->k_objectid)) {
return ERR_PTR (-EACCES);
}
inode = reiserfs_iget (dir->i_sb, (struct cpu_key *)&(de.de_dir_id));
if (!inode || IS_ERR(inode)) {
reiserfs_write_unlock(dir->i_sb);
return ERR_PTR(-EACCES);
}
/* Propogate the priv_object flag so we know we're in the priv tree */
if (is_reiserfs_priv_object (dir))
REISERFS_I(inode)->i_flags |= i_priv_object;
}
reiserfs_write_unlock(dir->i_sb);
if ( retval == IO_ERROR ) {
......@@ -630,6 +644,7 @@ static int reiserfs_mknod (struct inode * dir, struct dentry *dentry, int mode,
goto out_failed;
}
inode->i_op = &reiserfs_special_inode_operations;
init_special_inode(inode, inode->i_mode, rdev) ;
//FIXME: needed for block and char devices only
......@@ -942,7 +957,7 @@ static int reiserfs_symlink (struct inode * parent_dir,
reiserfs_update_inode_transaction(inode) ;
reiserfs_update_inode_transaction(parent_dir) ;
inode->i_op = &page_symlink_inode_operations;
inode->i_op = &reiserfs_symlink_inode_operations;
inode->i_mapping->a_ops = &reiserfs_address_space_operations;
// must be sure this inode is written with this transaction
......@@ -1318,5 +1333,42 @@ struct inode_operations reiserfs_dir_inode_operations = {
.rmdir = reiserfs_rmdir,
.mknod = reiserfs_mknod,
.rename = reiserfs_rename,
.setattr = reiserfs_setattr,
.setxattr = reiserfs_setxattr,
.getxattr = reiserfs_getxattr,
.listxattr = reiserfs_listxattr,
.removexattr = reiserfs_removexattr,
.permission = reiserfs_permission,
};
/*
* symlink operations.. same as page_symlink_inode_operations, with xattr
* stuff added
*/
struct inode_operations reiserfs_symlink_inode_operations = {
.readlink = page_readlink,
.follow_link = page_follow_link,
.setattr = reiserfs_setattr,
.setxattr = reiserfs_setxattr,
.getxattr = reiserfs_getxattr,
.listxattr = reiserfs_listxattr,
.removexattr = reiserfs_removexattr,
.permission = reiserfs_permission,
};
/*
* special file operations.. just xattr/acl stuff
*/
struct inode_operations reiserfs_special_inode_operations = {
.setattr = reiserfs_setattr,
.setxattr = reiserfs_setxattr,
.getxattr = reiserfs_getxattr,
.listxattr = reiserfs_listxattr,
.removexattr = reiserfs_removexattr,
.permission = reiserfs_permission,
};
fs/reiserfs/super.c
View file @ 0b1a6a8c
......@@ -17,6 +17,7 @@
#include <linux/time.h>
#include <asm/uaccess.h>
#include <linux/reiserfs_fs.h>
#include <linux/reiserfs_xattr.h>
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/blkdev.h>
......@@ -357,7 +358,17 @@ static void reiserfs_put_super (struct super_block * s)
{
int i;
struct reiserfs_transaction_handle th ;
if (REISERFS_SB(s)->xattr_root) {
d_invalidate (REISERFS_SB(s)->xattr_root);
dput (REISERFS_SB(s)->xattr_root);
}
if (REISERFS_SB(s)->priv_root) {
d_invalidate (REISERFS_SB(s)->priv_root);
dput (REISERFS_SB(s)->priv_root);
}
/* change file system state to current state if it was mounted with read-write permissions */
if (!(s->s_flags & MS_RDONLY)) {
journal_begin(&th, s, 10) ;
......@@ -669,6 +680,8 @@ static int reiserfs_parse_options (struct super_block * s, char * options, /* st
{"conv", 0, 0, 1<<REISERFS_CONVERT, 0},
{"attrs", 0, 0, 1<<REISERFS_ATTRS, 0},
{"noattrs", 0, 0, 0, 1<<REISERFS_ATTRS},
{"user_xattr", 0, 0, 1<<REISERFS_XATTRS_USER, 0},
{"nouser_xattr", 0, 0, 0, 1<<REISERFS_XATTRS_USER},
{"nolog", 0, 0, 0, 0}, /* This is unsupported */
{"replayonly", 0, 0, 1<<REPLAYONLY, 0},
{"block-allocator", 'a', balloc, 0, 0},
......@@ -813,6 +826,7 @@ static int reiserfs_remount (struct super_block * s, int * mount_flags, char * a
safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
safe_mask |= 1 << REISERFS_TEST4;
safe_mask |= 1 << REISERFS_ATTRS;
safe_mask |= 1 << REISERFS_XATTRS_USER;
/* Update the bitmask, taking care to keep
* the bits we're not allowed to change here */
......@@ -836,6 +850,7 @@ static int reiserfs_remount (struct super_block * s, int * mount_flags, char * a
}
if (*mount_flags & MS_RDONLY) {
reiserfs_xattr_init (s, *mount_flags);
/* remount read-only */
if (s->s_flags & MS_RDONLY)
/* it is read-only already */
......@@ -852,8 +867,10 @@ static int reiserfs_remount (struct super_block * s, int * mount_flags, char * a
journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB (s));
} else {
/* remount read-write */
if (!(s->s_flags & MS_RDONLY))
if (!(s->s_flags & MS_RDONLY)) {
reiserfs_xattr_init (s, *mount_flags);
return 0; /* We are read-write already */
}
handle_data_mode(s, mount_options);
REISERFS_SB(s)->s_mount_state = sb_umount_state(rs) ;
......@@ -874,8 +891,10 @@ static int reiserfs_remount (struct super_block * s, int * mount_flags, char * a
journal_end(&th, s, 10) ;
s->s_dirt = 0;
if (!( *mount_flags & MS_RDONLY ) )
if (!( *mount_flags & MS_RDONLY ) ) {
finish_unfinished( s );
reiserfs_xattr_init (s, *mount_flags);
}
return 0;
}
......@@ -1305,6 +1324,8 @@ static int reiserfs_fill_super (struct super_block * s, void * data, int silent)
REISERFS_SB(s)->s_alloc_options.preallocmin = 4;
/* Preallocate by 16 blocks (17-1) at once */
REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
/* Initialize the rwsem for xattr dir */
init_rwsem(&REISERFS_SB(s)->xattr_dir_sem);
jdev_name = NULL;
if (reiserfs_parse_options (s, (char *) data, &(sbi->s_mount_opt), &blocks, &jdev_name, &commit_max_age) == 0) {
......@@ -1449,13 +1470,25 @@ static int reiserfs_fill_super (struct super_block * s, void * data, int silent)
journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB (s));
journal_end(&th, s, 1) ;
if (reiserfs_xattr_init (s, s->s_flags)) {
dput (s->s_root);
s->s_root = NULL;
goto error;
}
/* look for files which were to be removed in previous session */
finish_unfinished (s);
} else {
if ( old_format_only(s) && !silent) {
reiserfs_warning("reiserfs: using 3.5.x disk format\n") ;
}
if (reiserfs_xattr_init (s, s->s_flags)) {
dput (s->s_root);
s->s_root = NULL;
goto error;
}
}
// mark hash in super block: it could be unset. overwrite should be ok
set_sb_hash_function_code( rs, function2code(sbi->s_hash_function ) );
......@@ -1523,6 +1556,9 @@ init_reiserfs_fs ( void )
return ret;
}
if ((ret = reiserfs_xattr_register_handlers ()))
goto failed_reiserfs_xattr_register_handlers;
reiserfs_proc_info_global_init ();
reiserfs_proc_register_global ("version", reiserfs_global_version_in_proc);
......@@ -1532,6 +1568,9 @@ init_reiserfs_fs ( void )
return 0;
}
reiserfs_xattr_unregister_handlers ();
failed_reiserfs_xattr_register_handlers:
reiserfs_proc_unregister_global ("version");
reiserfs_proc_info_global_done ();
destroy_inodecache ();
......@@ -1542,6 +1581,7 @@ init_reiserfs_fs ( void )
static void __exit
exit_reiserfs_fs ( void )
{
reiserfs_xattr_unregister_handlers ();
reiserfs_proc_unregister_global ("version");
reiserfs_proc_info_global_done ();
unregister_filesystem (& reiserfs_fs_type);
......
fs/reiserfs/xattr.c 0 → 100644
View file @ 0b1a6a8c
/*
* linux/fs/reiserfs/xattr.c
*
* Copyright (c) 2002 by Jeff Mahoney, <jeffm@suse.com>
*
*/
/*
* In order to implement EAs in a clean, backwards compatible manner,
* they are implemented as files in a "private" directory.
* Each EA is in it's own file, with the directory layout like so (/ is assumed
* to be relative to fs root). Inside the /.reiserfs_priv/xattrs directory,
* directories named using the capital-hex form of the objectid and
* generation number are used. Inside each directory are individual files
* named with the name of the extended attribute.
*
* So, for objectid 12648430, we could have:
* /.reiserfs_priv/xattrs/C0FFEE.0/user.Content-Type
* .. or similar.
*
* The file contents are the text of the EA. The size is known based on the
* stat data describing the file.
*
*/
#include <linux/reiserfs_fs.h>
#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include <linux/reiserfs_xattr.h>
#include <linux/mbcache.h>
#include <asm/uaccess.h>
#include <asm/checksum.h>
#include <linux/smp_lock.h>
#include <linux/stat.h>
#include <asm/semaphore.h>
#define FL_READONLY 128
#define FL_DIR_SEM_HELD 256
#define PRIVROOT_NAME ".reiserfs_priv"
#define XAROOT_NAME "xattrs"
static struct reiserfs_xattr_handler *find_xattr_handler_prefix (const char *prefix);
static struct dentry *
create_xa_root (struct super_block *sb)
{
struct dentry *privroot = dget (REISERFS_SB(sb)->priv_root);
struct dentry *xaroot;
/* This needs to be created at mount-time */
if (!privroot)
return ERR_PTR(-EOPNOTSUPP);
xaroot = lookup_one_len (XAROOT_NAME, privroot, strlen (XAROOT_NAME));
if (IS_ERR (xaroot)) {
goto out;
} else if (!xaroot->d_inode) {
int err;
down (&privroot->d_inode->i_sem);
err = privroot->d_inode->i_op->mkdir (privroot->d_inode, xaroot, 0700);
up (&privroot->d_inode->i_sem);
if (err) {
dput (xaroot);
dput (privroot);
return ERR_PTR (err);
}
REISERFS_SB(sb)->xattr_root = dget (xaroot);
}
out:
dput (privroot);
return xaroot;
}
/* This will return a dentry, or error, refering to the xa root directory.
* If the xa root doesn't exist yet, the dentry will be returned without
* an associated inode. This dentry can be used with ->mkdir to create
* the xa directory. */
static struct dentry *
__get_xa_root (struct super_block *s)
{
struct dentry *privroot = dget (REISERFS_SB(s)->priv_root);
struct dentry *xaroot = NULL;
if (IS_ERR (privroot) || !privroot)
return privroot;
xaroot = lookup_one_len (XAROOT_NAME, privroot, strlen (XAROOT_NAME));
if (IS_ERR (xaroot)) {
goto out;
} else if (!xaroot->d_inode) {
dput (xaroot);
xaroot = NULL;
goto out;
}
REISERFS_SB(s)->xattr_root = dget (xaroot);
out:
dput (privroot);
return xaroot;
}
/* Returns the dentry (or NULL) referring to the root of the extended
* attribute directory tree. If it has already been retreived, it is used.
* Otherwise, we attempt to retreive it from disk. It may also return
* a pointer-encoded error.
*/
static inline struct dentry *
get_xa_root (struct super_block *s)
{
struct dentry *dentry = dget (REISERFS_SB(s)->xattr_root);
if (!dentry)
dentry = __get_xa_root (s);
return dentry;
}
/* Opens the directory corresponding to the inode's extended attribute store.
* If flags allow, the tree to the directory may be created. If creation is
* prohibited, -ENODATA is returned. */
static struct dentry *
open_xa_dir (const struct inode *inode, int flags)
{
struct dentry *xaroot, *xadir;
char namebuf[17];
xaroot = get_xa_root (inode->i_sb);
if (IS_ERR (xaroot)) {
return xaroot;
} else if (!xaroot) {
if (flags == 0 || flags & XATTR_CREATE) {
xaroot = create_xa_root (inode->i_sb);
if (IS_ERR (xaroot))
return xaroot;
}
if (!xaroot)
return ERR_PTR (-ENODATA);
}
/* ok, we have xaroot open */
snprintf (namebuf, sizeof (namebuf), "%X.%X",
le32_to_cpu (INODE_PKEY (inode)->k_objectid),
inode->i_generation);
xadir = lookup_one_len (namebuf, xaroot, strlen (namebuf));
if (IS_ERR (xadir)) {
dput (xaroot);
return xadir;
}
if (!xadir->d_inode) {
int err;
if (flags == 0 || flags & XATTR_CREATE) {
/* Although there is nothing else trying to create this directory,
* another directory with the same hash may be created, so we need
* to protect against that */
err = xaroot->d_inode->i_op->mkdir (xaroot->d_inode, xadir, 0700);
if (err) {
dput (xaroot);
dput (xadir);
return ERR_PTR (err);
}
}
if (!xadir->d_inode) {
dput (xaroot);
dput (xadir);
return ERR_PTR (-ENODATA);
}
/* Newly created object.. Need to mark it private */
REISERFS_I(xadir->d_inode)->i_flags |= i_priv_object;
}
dput (xaroot);
return xadir;
}
/* Returns a dentry corresponding to a specific extended attribute file
* for the inode. If flags allow, the file is created. Otherwise, a
* valid or negative dentry, or an error is returned. */
static struct dentry *
get_xa_file_dentry (const struct inode *inode, const char *name, int flags)
{
struct dentry *xadir, *xafile;
int err = 0;
xadir = open_xa_dir (inode, flags);
if (IS_ERR (xadir)) {
return ERR_PTR (PTR_ERR (xadir));
} else if (xadir && !xadir->d_inode) {
dput (xadir);
return ERR_PTR (-ENODATA);
}
xafile = lookup_one_len (name, xadir, strlen (name));
if (IS_ERR (xafile)) {
dput (xadir);
return ERR_PTR (PTR_ERR (xafile));
}
if (xafile->d_inode) { /* file exists */
if (flags & XATTR_CREATE) {
err = -EEXIST;
dput (xafile);
goto out;
}
} else if (flags & XATTR_REPLACE || flags & FL_READONLY) {
goto out;
} else {
/* inode->i_sem is down, so nothing else can try to create
* the same xattr */
err = xadir->d_inode->i_op->create (xadir->d_inode, xafile,
0700|S_IFREG, NULL);
if (err) {
dput (xafile);
goto out;
}
/* Newly created object.. Need to mark it private */
REISERFS_I(xafile->d_inode)->i_flags |= i_priv_object;
}
out:
dput (xadir);
if (err)
xafile = ERR_PTR (err);
return xafile;
}
/* Opens a file pointer to the attribute associated with inode */
static struct file *
open_xa_file (const struct inode *inode, const char *name, int flags)
{
struct dentry *xafile;
struct file *fp;
xafile = get_xa_file_dentry (inode, name, flags);
if (IS_ERR (xafile))
return ERR_PTR (PTR_ERR (xafile));
else if (!xafile->d_inode) {
dput (xafile);
return ERR_PTR (-ENODATA);
}
fp = dentry_open (xafile, NULL, O_RDWR);
/* dentry_open dputs the dentry if it fails */
return fp;
}
/*
* this is very similar to fs/reiserfs/dir.c:reiserfs_readdir, but
* we need to drop the path before calling the filldir struct. That
* would be a big performance hit to the non-xattr case, so I've copied
* the whole thing for now. --clm
*
* the big difference is that I go backwards through the directory,
* and don't mess with f->f_pos, but the idea is the same. Do some
* action on each and every entry in the directory.
*
* we're called with i_sem held, so there are no worries about the directory
* changing underneath us.
*/
static int __xattr_readdir(struct file * filp, void * dirent, filldir_t filldir)
{
struct inode *inode = filp->f_dentry->d_inode;
struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */
INITIALIZE_PATH (path_to_entry);
struct buffer_head * bh;
int entry_num;
struct item_head * ih, tmp_ih;
int search_res;
char * local_buf;
loff_t next_pos;
char small_buf[32] ; /* avoid kmalloc if we can */
struct reiserfs_de_head *deh;
int d_reclen;
char * d_name;
off_t d_off;
ino_t d_ino;
struct reiserfs_dir_entry de;
/* form key for search the next directory entry using f_pos field of
file structure */
next_pos = max_reiserfs_offset(inode);
while (1) {
research:
if (next_pos <= DOT_DOT_OFFSET)
break;
make_cpu_key (&pos_key, inode, next_pos, TYPE_DIRENTRY, 3);
search_res = search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry, &de);
if (search_res == IO_ERROR) {
// FIXME: we could just skip part of directory which could
// not be read
pathrelse(&path_to_entry);
return -EIO;
}
if (search_res == NAME_NOT_FOUND)
de.de_entry_num--;
set_de_name_and_namelen(&de);
entry_num = de.de_entry_num;
deh = &(de.de_deh[entry_num]);
bh = de.de_bh;
ih = de.de_ih;
if (!is_direntry_le_ih(ih)) {
reiserfs_warning("not direntry %h\n", ih);
break;
}
copy_item_head(&tmp_ih, ih);
/* we must have found item, that is item of this directory, */
RFALSE( COMP_SHORT_KEYS (&(ih->ih_key), &pos_key),
"vs-9000: found item %h does not match to dir we readdir %K",
ih, &pos_key);
if (deh_offset(deh) <= DOT_DOT_OFFSET) {
break;
}
/* look for the previous entry in the directory */
next_pos = deh_offset (deh) - 1;
if (!de_visible (deh))
/* it is hidden entry */
continue;
d_reclen = entry_length(bh, ih, entry_num);
d_name = B_I_DEH_ENTRY_FILE_NAME (bh, ih, deh);
d_off = deh_offset (deh);
d_ino = deh_objectid (deh);
if (!d_name[d_reclen - 1])
d_reclen = strlen (d_name);
if (d_reclen > REISERFS_MAX_NAME(inode->i_sb->s_blocksize)){
/* too big to send back to VFS */
continue ;
}
/* Ignore the .reiserfs_priv entry */
if (reiserfs_xattrs (inode->i_sb) &&
!old_format_only(inode->i_sb) &&
deh_objectid (deh) == le32_to_cpu (INODE_PKEY(REISERFS_SB(inode->i_sb)->priv_root->d_inode)->k_objectid))
continue;
if (d_reclen <= 32) {
local_buf = small_buf ;
} else {
local_buf = reiserfs_kmalloc(d_reclen, GFP_NOFS, inode->i_sb) ;
if (!local_buf) {
pathrelse (&path_to_entry);
return -ENOMEM ;
}
if (item_moved (&tmp_ih, &path_to_entry)) {
reiserfs_kfree(local_buf, d_reclen, inode->i_sb) ;
/* sigh, must retry. Do this same offset again */
next_pos = d_off;
goto research;
}
}
// Note, that we copy name to user space via temporary
// buffer (local_buf) because filldir will block if
// user space buffer is swapped out. At that time
// entry can move to somewhere else
memcpy (local_buf, d_name, d_reclen);
/* the filldir function might need to start transactions,
* or do who knows what. Release the path now that we've
* copied all the important stuff out of the deh
*/
pathrelse (&path_to_entry);
if (filldir (dirent, local_buf, d_reclen, d_off, d_ino,
DT_UNKNOWN) < 0) {
if (local_buf != small_buf) {
reiserfs_kfree(local_buf, d_reclen, inode->i_sb) ;
}
goto end;
}
if (local_buf != small_buf) {
reiserfs_kfree(local_buf, d_reclen, inode->i_sb) ;
}
} /* while */
end:
pathrelse (&path_to_entry);
return 0;
}
/*
* this could be done with dedicated readdir ops for the xattr files,
* but I want to get something working asap
* this is stolen from vfs_readdir
*
*/
static
int xattr_readdir(struct file *file, filldir_t filler, void *buf)
{
struct inode *inode = file->f_dentry->d_inode;
int res = -ENOTDIR;
if (!file->f_op || !file->f_op->readdir)
goto out;
down(&inode->i_sem);
// down(&inode->i_zombie);
res = -ENOENT;
if (!IS_DEADDIR(inode)) {
lock_kernel();
res = __xattr_readdir(file, buf, filler);
unlock_kernel();
}
// up(&inode->i_zombie);
up(&inode->i_sem);
out:
return res;
}
/* Internal operations on file data */
static inline void
reiserfs_put_page(struct page *page)
{
kunmap(page);
page_cache_release(page);
}
static struct page *
reiserfs_get_page(struct inode *dir, unsigned long n)
{
struct address_space *mapping = dir->i_mapping;
struct page *page;
/* We can deadlock if we try to free dentries,
and an unlink/rmdir has just occured - GFP_NOFS avoids this */
mapping->flags = (mapping->flags & ~__GFP_BITS_MASK) | GFP_NOFS;
page = read_cache_page (mapping, n,
(filler_t*)mapping->a_ops->readpage, NULL);
if (!IS_ERR(page)) {
wait_on_page_locked(page);
kmap(page);
if (!PageUptodate(page))
goto fail;
if (PageError(page))
goto fail;
}
return page;
fail:
reiserfs_put_page(page);
return ERR_PTR(-EIO);
}
static inline __u32
xattr_hash (const char *msg, int len)
{
return csum_partial (msg, len, 0);
}
/* Generic extended attribute operations that can be used by xa plugins */
/*
* inode->i_sem: down
*/
int
reiserfs_xattr_set (struct inode *inode, const char *name, const void *buffer,
size_t buffer_size, int flags)
{
int err = 0;
struct file *fp;
struct page *page;
char *data;
struct address_space *mapping;
size_t file_pos = 0;
size_t buffer_pos = 0;
struct inode *xinode;
struct iattr newattrs;
__u32 xahash = 0;
if (IS_RDONLY (inode))
return -EROFS;
if (IS_IMMUTABLE (inode) || IS_APPEND (inode))
return -EPERM;
if (get_inode_sd_version (inode) == STAT_DATA_V1)
return -EOPNOTSUPP;
/* Empty xattrs are ok, they're just empty files, no hash */
if (buffer && buffer_size)
xahash = xattr_hash (buffer, buffer_size);
open_file:
fp = open_xa_file (inode, name, flags);
if (IS_ERR (fp)) {
err = PTR_ERR (fp);
goto out;
}
xinode = fp->f_dentry->d_inode;
/* we need to copy it off.. */
if (xinode->i_nlink > 1) {
fput(fp);
err = reiserfs_xattr_del (inode, name);
if (err < 0)
goto out;
/* We just killed the old one, we're not replacing anymore */
if (flags & XATTR_REPLACE)
flags &= ~XATTR_REPLACE;
goto open_file;
}
/* Resize it so we're ok to write there */
newattrs.ia_size = buffer_size;
newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
down (&xinode->i_sem);
err = notify_change(fp->f_dentry, &newattrs);
if (err)
goto out_filp;
mapping = xinode->i_mapping;
while (buffer_pos < buffer_size || buffer_pos == 0) {
size_t chunk;
size_t skip = 0;
size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1));
if (buffer_size - buffer_pos > PAGE_CACHE_SIZE)
chunk = PAGE_CACHE_SIZE;
else
chunk = buffer_size - buffer_pos;
page = reiserfs_get_page (xinode, file_pos >> PAGE_CACHE_SHIFT);
if (IS_ERR (page)) {
err = PTR_ERR (page);
goto out_filp;
}
lock_page (page);
data = page_address (page);
if (file_pos == 0) {
struct reiserfs_xattr_header *rxh;
skip = file_pos = sizeof (struct reiserfs_xattr_header);
if (chunk + skip > PAGE_CACHE_SIZE)
chunk = PAGE_CACHE_SIZE - skip;
rxh = (struct reiserfs_xattr_header *)data;
rxh->h_magic = cpu_to_le32 (REISERFS_XATTR_MAGIC);
rxh->h_hash = cpu_to_le32 (xahash);
}
err = mapping->a_ops->prepare_write (fp, page, page_offset,
page_offset + chunk + skip);
if (!err) {
if (buffer)
memcpy (data + skip, buffer + buffer_pos, chunk);
err = mapping->a_ops->commit_write (fp, page, page_offset,
page_offset + chunk + skip);
}
unlock_page (page);
reiserfs_put_page (page);
buffer_pos += chunk;
file_pos += chunk;
skip = 0;
if (err || buffer_size == 0 || !buffer)
break;
}
inode->i_ctime = CURRENT_TIME;
mark_inode_dirty (inode);
out_filp:
up (&xinode->i_sem);
fput(fp);
out:
return err;
}
/*
* inode->i_sem: down
*/
int
reiserfs_xattr_get (const struct inode *inode, const char *name, void *buffer,
size_t buffer_size)
{
ssize_t err = 0;
struct file *fp;
size_t isize;
size_t file_pos = 0;
size_t buffer_pos = 0;
struct page *page;
struct inode *xinode;
__u32 hash = 0;
if (name == NULL)
return -EINVAL;
/* We can't have xattrs attached to v1 items since they don't have
* generation numbers */
if (get_inode_sd_version (inode) == STAT_DATA_V1)
return -EOPNOTSUPP;
fp = open_xa_file (inode, name, FL_READONLY);
if (IS_ERR (fp)) {
err = PTR_ERR (fp);
goto out;
}
xinode = fp->f_dentry->d_inode;
isize = xinode->i_size;
/* Just return the size needed */
if (buffer == NULL) {
err = isize - sizeof (struct reiserfs_xattr_header);
goto out_dput;
}
if (buffer_size < isize - sizeof (struct reiserfs_xattr_header)) {
err = -ERANGE;
goto out_dput;
}
while (file_pos < isize) {
size_t chunk;
char *data;
size_t skip = 0;
if (isize - file_pos > PAGE_CACHE_SIZE)
chunk = PAGE_CACHE_SIZE;
else
chunk = isize - file_pos;
page = reiserfs_get_page (xinode, file_pos >> PAGE_CACHE_SHIFT);
if (IS_ERR (page)) {
err = PTR_ERR (page);
goto out_dput;
}
lock_page (page);
data = page_address (page);
if (file_pos == 0) {
struct reiserfs_xattr_header *rxh =
(struct reiserfs_xattr_header *)data;
skip = file_pos = sizeof (struct reiserfs_xattr_header);
chunk -= skip;
/* Magic doesn't match up.. */
if (rxh->h_magic != cpu_to_le32 (REISERFS_XATTR_MAGIC)) {
unlock_page (page);
reiserfs_put_page (page);
reiserfs_warning ("reiserfs: Invalid magic for xattr (%s) "
"associated with %s %k\n", name,
reiserfs_bdevname (inode->i_sb),
INODE_PKEY (inode));
err = -EIO;
goto out_dput;
}
hash = le32_to_cpu (rxh->h_hash);
}
memcpy (buffer + buffer_pos, data + skip, chunk);
unlock_page (page);
reiserfs_put_page (page);
file_pos += chunk;
buffer_pos += chunk;
skip = 0;
}
err = isize - sizeof (struct reiserfs_xattr_header);
if (xattr_hash (buffer, isize - sizeof (struct reiserfs_xattr_header)) != hash) {
reiserfs_warning ("reiserfs: Invalid hash for xattr (%s) associated "
"with %s %k\n", name,
reiserfs_bdevname (inode->i_sb), INODE_PKEY (inode));
err = -EIO;
}
out_dput:
fput(fp);
out:
return err;
}
static int
__reiserfs_xattr_del (struct dentry *xadir, const char *name, int namelen)
{
struct dentry *dentry;
struct inode *dir = xadir->d_inode;
int err = 0;
dentry = lookup_one_len (name, xadir, namelen);
if (IS_ERR (dentry)) {
err = PTR_ERR (dentry);
goto out;
} else if (!dentry->d_inode) {
err = -ENODATA;
goto out_file;
}
/* Skip directories.. */
if (S_ISDIR (dentry->d_inode->i_mode))
goto out_file;
if (!is_reiserfs_priv_object (dentry->d_inode)) {
reiserfs_warning ("OID %08x [%.*s/%.*s] doesn't have priv flag set [parent is %sset].\n",
le32_to_cpu (INODE_PKEY (dentry->d_inode)->k_objectid),
xadir->d_name.len, xadir->d_name.name, namelen, name,
is_reiserfs_priv_object (xadir->d_inode) ? "" : "not ");
dput (dentry);
return -EIO;
}
err = dir->i_op->unlink (dir, dentry);
if (!err)
d_delete (dentry);
out_file:
dput (dentry);
out:
return err;
}
int
reiserfs_xattr_del (struct inode *inode, const char *name)
{
struct dentry *dir;
int err;
if (IS_RDONLY (inode))
return -EROFS;
dir = open_xa_dir (inode, FL_READONLY);
if (IS_ERR (dir)) {
err = PTR_ERR (dir);
goto out;
}
err = __reiserfs_xattr_del (dir, name, strlen (name));
dput (dir);
out:
return err;
}
/* The following are side effects of other operations that aren't explicitly
* modifying extended attributes. This includes operations such as permissions
* or ownership changes, object deletions, etc. */
static int
reiserfs_delete_xattrs_filler (void *buf, const char *name, int namelen,
loff_t offset, ino_t ino, unsigned int d_type)
{
struct dentry *xadir = (struct dentry *)buf;
return __reiserfs_xattr_del (xadir, name, namelen);
}
/* This is called w/ inode->i_sem downed */
int
reiserfs_delete_xattrs (struct inode *inode)
{
struct file *fp;
struct dentry *dir, *root;
int err = 0;
/* Skip out, an xattr has no xattrs associated with it */
if (is_reiserfs_priv_object (inode) ||
get_inode_sd_version (inode) == STAT_DATA_V1 ||
!reiserfs_xattrs(inode->i_sb))
{
return 0;
}
reiserfs_read_lock_xattrs (inode->i_sb);
dir = open_xa_dir (inode, FL_READONLY);
reiserfs_read_unlock_xattrs (inode->i_sb);
if (IS_ERR (dir)) {
err = PTR_ERR (dir);
goto out;
} else if (!dir->d_inode) {
dput (dir);
return 0;
}
fp = dentry_open (dir, NULL, O_RDWR);
if (IS_ERR (fp)) {
err = PTR_ERR (fp);
/* dentry_open dputs the dentry if it fails */
goto out;
}
lock_kernel ();
err = xattr_readdir (fp, reiserfs_delete_xattrs_filler, dir);
if (err) {
unlock_kernel ();
goto out_dir;
}
/* Leftovers besides . and .. -- that's not good. */
if (dir->d_inode->i_nlink <= 2) {
root = get_xa_root (inode->i_sb);
reiserfs_write_lock_xattrs (inode->i_sb);
err = vfs_rmdir (root->d_inode, dir);
reiserfs_write_unlock_xattrs (inode->i_sb);
dput (root);
} else {
reiserfs_warning ("Couldn't remove all entries in directory\n");
}
unlock_kernel ();
out_dir:
fput(fp);
out:
return err;
}
struct reiserfs_chown_buf {
struct inode *inode;
struct dentry *xadir;
struct iattr *attrs;
};
/* XXX: If there is a better way to do this, I'd love to hear about it */
static int
reiserfs_chown_xattrs_filler (void *buf, const char *name, int namelen,
loff_t offset, ino_t ino, unsigned int d_type)
{
struct reiserfs_chown_buf *chown_buf = (struct reiserfs_chown_buf *)buf;
struct dentry *xafile, *xadir = chown_buf->xadir;
struct iattr *attrs = chown_buf->attrs;
int err = 0;
xafile = lookup_one_len (name, xadir, namelen);
if (IS_ERR (xafile))
return PTR_ERR (xafile);
else if (!xafile->d_inode) {
dput (xafile);
return -ENODATA;
}
if (!S_ISDIR (xafile->d_inode->i_mode))
err = notify_change (xafile, attrs);
dput (xafile);
return err;
}
int
reiserfs_chown_xattrs (struct inode *inode, struct iattr *attrs)
{
struct file *fp;
struct dentry *dir;
int err = 0;
struct reiserfs_chown_buf buf;
unsigned int ia_valid = attrs->ia_valid;
/* Skip out, an xattr has no xattrs associated with it */
if (is_reiserfs_priv_object (inode) ||
get_inode_sd_version (inode) == STAT_DATA_V1 ||
!reiserfs_xattrs(inode->i_sb))
{
return 0;
}
reiserfs_read_lock_xattrs (inode->i_sb);
dir = open_xa_dir (inode, FL_READONLY);
reiserfs_read_unlock_xattrs (inode->i_sb);
if (IS_ERR (dir)) {
if (PTR_ERR (dir) != -ENODATA)
err = PTR_ERR (dir);
goto out;
} else if (!dir->d_inode) {
dput (dir);
goto out;
}
fp = dentry_open (dir, NULL, O_RDWR);
if (IS_ERR (fp)) {
err = PTR_ERR (fp);
/* dentry_open dputs the dentry if it fails */
goto out;
}
lock_kernel ();
attrs->ia_valid &= (ATTR_UID | ATTR_GID | ATTR_CTIME);
buf.xadir = dir;
buf.attrs = attrs;
buf.inode = inode;
err = xattr_readdir (fp, reiserfs_chown_xattrs_filler, &buf);
if (err) {
unlock_kernel ();
goto out_dir;
}
err = notify_change (dir, attrs);
unlock_kernel ();
out_dir:
fput(fp);
out:
attrs->ia_valid = ia_valid;
return err;
}
/* Actual operations that are exported to VFS-land */
/*
* Inode operation getxattr()
* Preliminary locking: we down dentry->d_inode->i_sem
*/
ssize_t
reiserfs_getxattr (struct dentry *dentry, const char *name, void *buffer,
size_t size)
{
struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix (name);
int err;
if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
get_inode_sd_version (dentry->d_inode) == STAT_DATA_V1)
return -EOPNOTSUPP;
down (&dentry->d_inode->i_sem);
reiserfs_read_lock_xattrs (dentry->d_sb);
err = xah->get (dentry->d_inode, name, buffer, size);
reiserfs_read_unlock_xattrs (dentry->d_sb);
up (&dentry->d_inode->i_sem);
return err;
}
/*
* Inode operation setxattr()
*
* dentry->d_inode->i_sem down
*/
int
reiserfs_setxattr (struct dentry *dentry, const char *name, const void *value,
size_t size, int flags)
{
struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix (name);
int err;
if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
get_inode_sd_version (dentry->d_inode) == STAT_DATA_V1)
return -EOPNOTSUPP;
if (IS_RDONLY (dentry->d_inode))
return -EROFS;
if (IS_IMMUTABLE (dentry->d_inode) || IS_APPEND (dentry->d_inode))
return -EROFS;
reiserfs_write_lock_xattrs (dentry->d_sb);
err = xah->set (dentry->d_inode, name, value, size, flags);
reiserfs_write_unlock_xattrs (dentry->d_sb);
return err;
}
/*
* Inode operation removexattr()
*
* dentry->d_inode->i_sem down
*/
int
reiserfs_removexattr (struct dentry *dentry, const char *name)
{
int err;
struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix (name);
if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
get_inode_sd_version (dentry->d_inode) == STAT_DATA_V1)
return -EOPNOTSUPP;
if (IS_RDONLY (dentry->d_inode))
return -EROFS;
if (IS_IMMUTABLE (dentry->d_inode) || IS_APPEND (dentry->d_inode))
return -EPERM;
reiserfs_read_lock_xattrs (dentry->d_sb);
/* Deletion pre-operation */
if (xah->del) {
err = xah->del (dentry->d_inode, name);
if (err)
goto out;
}
err = reiserfs_xattr_del (dentry->d_inode, name);
dentry->d_inode->i_ctime = CURRENT_TIME;
mark_inode_dirty (dentry->d_inode);
out:
reiserfs_read_unlock_xattrs (dentry->d_sb);
return err;
}
/* This is what filldir will use:
* r_pos will always contain the amount of space required for the entire
* list. If r_pos becomes larger than r_size, we need more space and we
* return an error indicating this. If r_pos is less than r_size, then we've
* filled the buffer successfully and we return success */
struct reiserfs_listxattr_buf {
int r_pos;
int r_size;
char *r_buf;
struct inode *r_inode;
};
static int
reiserfs_listxattr_filler (void *buf, const char *name, int namelen,
loff_t offset, ino_t ino, unsigned int d_type)
{
struct reiserfs_listxattr_buf *b = (struct reiserfs_listxattr_buf *)buf;
int len = 0;
if (name[0] != '.' || (namelen != 1 && (name[1] != '.' || namelen != 2))) {
struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix (name);
if (!xah) return 0; /* Unsupported xattr name, skip it */
/* We call ->list() twice because the operation isn't required to just
* return the name back - we want to make sure we have enough space */
len += xah->list (b->r_inode, name, namelen, NULL);
if (len) {
if (b->r_pos + len + 1 <= b->r_size) {
char *p = b->r_buf + b->r_pos;
p += xah->list (b->r_inode, name, namelen, p);
*p++ = '\0';
}
b->r_pos += len + 1;
}
}
return 0;
}
/*
* Inode operation listxattr()
*
* Preliminary locking: we down dentry->d_inode->i_sem
*/
ssize_t
reiserfs_listxattr (struct dentry *dentry, char *buffer, size_t size)
{
struct file *fp;
struct dentry *dir;
int err = 0;
struct reiserfs_listxattr_buf buf;
if (!dentry->d_inode)
return -EINVAL;
if (!reiserfs_xattrs(dentry->d_sb) ||
get_inode_sd_version (dentry->d_inode) == STAT_DATA_V1)
return -EOPNOTSUPP;
down (&dentry->d_inode->i_sem);
reiserfs_read_lock_xattrs (dentry->d_sb);
dir = open_xa_dir (dentry->d_inode, FL_READONLY);
reiserfs_read_unlock_xattrs (dentry->d_sb);
if (IS_ERR (dir)) {
err = PTR_ERR (dir);
if (err == -ENODATA)
err = 0; /* Not an error if there aren't any xattrs */
goto out;
}
fp = dentry_open (dir, NULL, O_RDWR);
if (IS_ERR (fp)) {
err = PTR_ERR (fp);
/* dentry_open dputs the dentry if it fails */
goto out;
}
buf.r_buf = buffer;
buf.r_size = buffer ? size : 0;
buf.r_pos = 0;
buf.r_inode = dentry->d_inode;
err = xattr_readdir (fp, reiserfs_listxattr_filler, &buf);
if (err)
goto out_dir;
if (buf.r_pos > buf.r_size && buffer != NULL)
err = -ERANGE;
else
err = buf.r_pos;
out_dir:
fput(fp);
out:
up (&dentry->d_inode->i_sem);
return err;
}
/* This is the implementation for the xattr plugin infrastructure */
static struct list_head xattr_handlers = LIST_HEAD_INIT (xattr_handlers);
static rwlock_t handler_lock = RW_LOCK_UNLOCKED;
static struct reiserfs_xattr_handler *
find_xattr_handler_prefix (const char *prefix)
{
struct reiserfs_xattr_handler *xah = NULL;
struct list_head *p;
read_lock (&handler_lock);
list_for_each (p, &xattr_handlers) {
xah = list_entry (p, struct reiserfs_xattr_handler, handlers);
if (strncmp (xah->prefix, prefix, strlen (xah->prefix)) == 0)
break;
xah = NULL;
}
read_unlock (&handler_lock);
return xah;
}
static void
__unregister_handlers (void)
{
struct reiserfs_xattr_handler *xah;
struct list_head *p, *tmp;
list_for_each_safe (p, tmp, &xattr_handlers) {
xah = list_entry (p, struct reiserfs_xattr_handler, handlers);
if (xah->exit)
xah->exit();
list_del_init (p);
}
INIT_LIST_HEAD (&xattr_handlers);
}
int __init
reiserfs_xattr_register_handlers (void)
{
int err = 0;
struct reiserfs_xattr_handler *xah;
struct list_head *p;
write_lock (&handler_lock);
/* If we're already initialized, nothing to do */
if (!list_empty (&xattr_handlers)) {
write_unlock (&handler_lock);
return 0;
}
/* Add the handlers */
list_add_tail (&user_handler.handlers, &xattr_handlers);
/* Run initializers, if available */
list_for_each (p, &xattr_handlers) {
xah = list_entry (p, struct reiserfs_xattr_handler, handlers);
if (xah->init) {
err = xah->init ();
if (err) {
list_del_init (p);
break;
}
}
}
/* Clean up other handlers, if any failed */
if (err)
__unregister_handlers ();
write_unlock (&handler_lock);
return err;
}
void
reiserfs_xattr_unregister_handlers (void)
{
write_lock (&handler_lock);
__unregister_handlers ();
write_unlock (&handler_lock);
}
/* This will catch lookups from the fs root to .reiserfs_priv */
static int
xattr_lookup_poison (struct dentry *dentry, struct qstr *q1, struct qstr *name)
{
struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root;
if (name->len == priv_root->d_name.len &&
name->hash == priv_root->d_name.hash &&
!memcmp (name->name, priv_root->d_name.name, name->len)) {
return -ENOENT;
}
return 0;
}
static struct dentry_operations xattr_lookup_poison_ops = {
.d_compare = xattr_lookup_poison,
};
/* We need to take a copy of the mount flags since things like
* MS_RDONLY don't get set until *after* we're called.
* mount_flags != mount_options */
int
reiserfs_xattr_init (struct super_block *s, int mount_flags)
{
int err = 0;
/* We need generation numbers to ensure that the oid mapping is correct
* v3.5 filesystems don't have them. */
if (!old_format_only (s)) {
set_bit (REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
} else if (reiserfs_xattrs_optional (s)) {
/* Old format filesystem, but optional xattrs have been enabled
* at mount time. Error out. */
reiserfs_warning ("reiserfs: xattrs not supported on pre v3.6 "
"format filesystem. Failing mount.\n");
err = -EOPNOTSUPP;
goto error;
} else {
/* Old format filesystem, but no optional xattrs have been enabled. This
* means we silently disable xattrs on the filesystem. */
clear_bit (REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
}
/* If we don't have the privroot located yet - go find it */
if (reiserfs_xattrs (s) && !REISERFS_SB(s)->priv_root) {
struct dentry *dentry;
dentry = lookup_one_len (PRIVROOT_NAME, s->s_root,
strlen (PRIVROOT_NAME));
if (!IS_ERR (dentry)) {
if (!(mount_flags & MS_RDONLY) && !dentry->d_inode) {
struct inode *inode = dentry->d_parent->d_inode;
down (&inode->i_sem);
err = inode->i_op->mkdir (inode, dentry, 0700);
up (&inode->i_sem);
if (err) {
dput (dentry);
dentry = NULL;
}
if (dentry && dentry->d_inode)
reiserfs_warning ("reiserfs: Created %s on %s - reserved for "
"xattr storage.\n", PRIVROOT_NAME,
reiserfs_bdevname (inode->i_sb));
} else if (!dentry->d_inode) {
dput (dentry);
dentry = NULL;
}
} else
err = PTR_ERR (dentry);
if (!err && dentry) {
s->s_root->d_op = &xattr_lookup_poison_ops;
REISERFS_I(dentry->d_inode)->i_flags |= i_priv_object;
REISERFS_SB(s)->priv_root = dentry;
} else if (!(mount_flags & MS_RDONLY)) { /* xattrs are unavailable */
/* If we're read-only it just means that the dir hasn't been
* created. Not an error -- just no xattrs on the fs. We'll
* check again if we go read-write */
reiserfs_warning ("reiserfs: xattrs enabled and couldn't "
"find/create .reiserfs_priv. Failing mount.\n");
err = -EOPNOTSUPP;
}
}
error:
/* This is only nonzero if there was an error initializing the xattr
* directory or if there is a condition where we don't support them. */
if (err) {
clear_bit (REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
clear_bit (REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt));
}
return err;
}
int
reiserfs_permission (struct inode *inode, int mask, struct nameidata *nd)
{
umode_t mode = inode->i_mode;
if (mask & MAY_WRITE) {
/*
* Nobody gets write access to a read-only fs.
*/
if (IS_RDONLY(inode) &&
(S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
return -EROFS;
/*
* Nobody gets write access to an immutable file.
*/
if (IS_IMMUTABLE(inode))
return -EACCES;
}
/* We don't do permission checks on the internal objects.
* Permissions are determined by the "owning" object. */
if (is_reiserfs_priv_object (inode))
return 0;
if (current->fsuid == inode->i_uid)
mode >>= 6;
else if (in_group_p(inode->i_gid))
mode >>= 3;
/*
* If the DACs are ok we don't need any capability check.
*/
if (((mode & mask & (MAY_READ|MAY_WRITE|MAY_EXEC)) == mask))
return 0;
/*
* Read/write DACs are always overridable.
* Executable DACs are overridable if at least one exec bit is set.
*/
if ((mask & (MAY_READ|MAY_WRITE)) || (inode->i_mode & S_IXUGO))
if (capable(CAP_DAC_OVERRIDE))
return 0;
/*
* Searching includes executable on directories, else just read.
*/
if (mask == MAY_READ || (S_ISDIR(inode->i_mode) && !(mask & MAY_WRITE)))
if (capable(CAP_DAC_READ_SEARCH))
return 0;
return -EACCES;
}
fs/reiserfs/xattr_user.c 0 → 100644
View file @ 0b1a6a8c
#include <linux/reiserfs_fs.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include <linux/reiserfs_xattr.h>
#include <asm/uaccess.h>
#define XATTR_USER_PREFIX "user."
static int
user_get (struct inode *inode, const char *name, void *buffer, size_t size)
{
int error;
if (strlen(name) < sizeof(XATTR_USER_PREFIX))
return -EINVAL;
if (!reiserfs_xattrs_user (inode->i_sb))
return -EOPNOTSUPP;
error = permission (inode, MAY_READ, NULL);
if (error)
return error;
return reiserfs_xattr_get (inode, name, buffer, size);
}
static int
user_set (struct inode *inode, const char *name, const void *buffer,
size_t size, int flags)
{
int error;
if (strlen(name) < sizeof(XATTR_USER_PREFIX))
return -EINVAL;
if (!reiserfs_xattrs_user (inode->i_sb))
return -EOPNOTSUPP;
if (!S_ISREG (inode->i_mode) &&
(!S_ISDIR (inode->i_mode) || inode->i_mode & S_ISVTX))
return -EPERM;
error = permission (inode, MAY_WRITE, NULL);
if (error)
return error;
return reiserfs_xattr_set (inode, name, buffer, size, flags);
}
static int
user_del (struct inode *inode, const char *name)
{
int error;
if (strlen(name) < sizeof(XATTR_USER_PREFIX))
return -EINVAL;
if (!reiserfs_xattrs_user (inode->i_sb))
return -EOPNOTSUPP;
if (!S_ISREG (inode->i_mode) &&
(!S_ISDIR (inode->i_mode) || inode->i_mode & S_ISVTX))
return -EPERM;
error = permission (inode, MAY_WRITE, NULL);
if (error)
return error;
return 0;
}
static int
user_list (struct inode *inode, const char *name, int namelen, char *out)
{
int len = namelen;
if (!reiserfs_xattrs_user (inode->i_sb))
return 0;
if (out)
memcpy (out, name, len);
return len;
}
struct reiserfs_xattr_handler user_handler = {
prefix: XATTR_USER_PREFIX,
get: user_get,
set: user_set,
del: user_del,
list: user_list,
};
include/linux/reiserfs_fs.h
View file @ 0b1a6a8c
......@@ -287,7 +287,7 @@ struct unfm_nodeinfo {
#define STAT_DATA_V2 1
static inline struct reiserfs_inode_info *REISERFS_I(struct inode *inode)
static inline struct reiserfs_inode_info *REISERFS_I(const struct inode *inode)
{
return container_of(inode, struct reiserfs_inode_info, vfs_inode);
}
......@@ -1960,6 +1960,7 @@ void reiserfs_update_sd (struct reiserfs_transaction_handle *th, struct inode *
void sd_attrs_to_i_attrs( __u16 sd_attrs, struct inode *inode );
void i_attrs_to_sd_attrs( struct inode *inode, __u16 *sd_attrs );
int reiserfs_setattr(struct dentry *dentry, struct iattr *attr);
/* namei.c */
void set_de_name_and_namelen (struct reiserfs_dir_entry * de);
......@@ -2010,6 +2011,8 @@ int reiserfs_global_version_in_proc( char *buffer, char **start, off_t offset,
/* dir.c */
extern struct inode_operations reiserfs_dir_inode_operations;
extern struct inode_operations reiserfs_symlink_inode_operations;
extern struct inode_operations reiserfs_special_inode_operations;
extern struct file_operations reiserfs_dir_operations;
/* tail_conversion.c */
......@@ -2237,6 +2240,9 @@ int reiserfs_unpack (struct inode * inode, struct file * filp);
#define reiserfs_write_lock( sb ) lock_kernel()
#define reiserfs_write_unlock( sb ) unlock_kernel()
/* xattr stuff */
#define REISERFS_XATTR_DIR_SEM(s) (REISERFS_SB(s)->xattr_dir_sem)
#endif /* _LINUX_REISER_FS_H */
include/linux/reiserfs_fs_i.h
View file @ 0b1a6a8c
......@@ -22,7 +22,8 @@ typedef enum {
truncate or unlink. Safe link is used to avoid leakage of disk
space on crash with some files open, but unlinked. */
i_link_saved_unlink_mask = 0x0010,
i_link_saved_truncate_mask = 0x0020
i_link_saved_truncate_mask = 0x0020,
i_priv_object = 0x0080,
} reiserfs_inode_flags;
......
include/linux/reiserfs_fs_sb.h
View file @ 0b1a6a8c
......@@ -6,6 +6,7 @@
#ifdef __KERNEL__
#include <linux/workqueue.h>
#include <linux/rwsem.h>
#endif
typedef enum {
......@@ -251,7 +252,6 @@ struct reiserfs_journal {
#define JOURNAL_DESC_MAGIC "ReIsErLB" /* ick. magic string to find desc blocks in the journal */
typedef __u32 (*hashf_t) (const signed char *, int);
struct reiserfs_bitmap_info
......@@ -395,6 +395,10 @@ struct reiserfs_sb_info
struct proc_dir_entry *procdir;
int reserved_blocks; /* amount of blocks reserved for further allocations */
spinlock_t bitmap_lock; /* this lock on now only used to protect reserved_blocks variable */
struct dentry *priv_root; /* root of /.reiserfs_priv */
struct dentry *xattr_root; /* root of /.reiserfs_priv/.xa */
struct rw_semaphore xattr_dir_sem;
};
/* Definitions of reiserfs on-disk properties: */
......@@ -437,6 +441,8 @@ enum reiserfs_mount_options {
REISERFS_NO_UNHASHED_RELOCATION,
REISERFS_HASHED_RELOCATION,
REISERFS_ATTRS,
REISERFS_XATTRS,
REISERFS_XATTRS_USER,
REISERFS_TEST1,
REISERFS_TEST2,
......@@ -462,6 +468,9 @@ enum reiserfs_mount_options {
#define reiserfs_data_log(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_LOG))
#define reiserfs_data_ordered(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_ORDERED))
#define reiserfs_data_writeback(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_WRITEBACK))
#define reiserfs_xattrs(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_XATTRS))
#define reiserfs_xattrs_user(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_XATTRS_USER))
#define reiserfs_xattrs_optional(s) reiserfs_xattrs_user(s)
void reiserfs_file_buffer (struct buffer_head * bh, int list);
extern struct file_system_type reiserfs_fs_type;
......
include/linux/reiserfs_xattr.h 0 → 100644
View file @ 0b1a6a8c
/*
File: linux/reiserfs_xattr.h
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/xattr.h>
/* Magic value in header */
#define REISERFS_XATTR_MAGIC 0x52465841 /* "RFXA" */
struct reiserfs_xattr_header {
__u32 h_magic; /* magic number for identification */
__u32 h_hash; /* hash of the value */
};
#ifdef __KERNEL__
struct reiserfs_xattr_handler {
char *prefix;
int (*init)(void);
void (*exit)(void);
int (*get)(struct inode *inode, const char *name, void *buffer,
size_t size);
int (*set)(struct inode *inode, const char *name, const void *buffer,
size_t size, int flags);
int (*del)(struct inode *inode, const char *name);
int (*list)(struct inode *inode, const char *name, int namelen, char *out);
struct list_head handlers;
};
#ifdef CONFIG_REISERFS_FS_XATTR
#define is_reiserfs_priv_object(inode) (REISERFS_I(inode)->i_flags & i_priv_object)
ssize_t reiserfs_getxattr (struct dentry *dentry, const char *name,
void *buffer, size_t size);
int reiserfs_setxattr (struct dentry *dentry, const char *name,
const void *value, size_t size, int flags);
ssize_t reiserfs_listxattr (struct dentry *dentry, char *buffer, size_t size);
int reiserfs_removexattr (struct dentry *dentry, const char *name);
int reiserfs_delete_xattrs (struct inode *inode);
int reiserfs_chown_xattrs (struct inode *inode, struct iattr *attrs);
int reiserfs_xattr_init (struct super_block *sb, int mount_flags);
int reiserfs_permission (struct inode *inode, int mask, struct nameidata *nd);
int reiserfs_xattr_del (struct inode *, const char *);
int reiserfs_xattr_get (const struct inode *, const char *, void *, size_t);
int reiserfs_xattr_set (struct inode *, const char *, const void *,
size_t, int);
extern struct reiserfs_xattr_handler user_handler;
int reiserfs_xattr_register_handlers (void) __init;
void reiserfs_xattr_unregister_handlers (void);
static inline void
reiserfs_write_lock_xattrs(struct super_block *sb)
{
down_write (&REISERFS_XATTR_DIR_SEM(sb));
}
static inline void
reiserfs_write_unlock_xattrs(struct super_block *sb)
{
up_write (&REISERFS_XATTR_DIR_SEM(sb));
}
static inline void
reiserfs_read_lock_xattrs(struct super_block *sb)
{
down_read (&REISERFS_XATTR_DIR_SEM(sb));
}
static inline void
reiserfs_read_unlock_xattrs(struct super_block *sb)
{
up_read (&REISERFS_XATTR_DIR_SEM(sb));
}
#else
#define is_reiserfs_priv_object(inode) 0
#define reiserfs_getxattr NULL
#define reiserfs_setxattr NULL
#define reiserfs_listxattr NULL
#define reiserfs_removexattr NULL
#define reiserfs_write_lock_xattrs(sb)
#define reiserfs_write_unlock_xattrs(sb)
#define reiserfs_read_lock_xattrs(sb)
#define reiserfs_read_unlock_xattrs(sb)
#define reiserfs_permission NULL
#define reiserfs_xattr_register_handlers() 0
#define reiserfs_xattr_unregister_handlers()
static inline int reiserfs_delete_xattrs (struct inode *inode) { return 0; };
static inline int reiserfs_chown_xattrs (struct inode *inode, struct iattr *attrs) { return 0; };
static inline int reiserfs_xattr_init (struct super_block *sb, int mount_flags) { return 0; };
#endif
#endif /* __KERNEL__ */
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