Commit 0b1a6a8c authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[PATCH] reiserfs: xattr support

From: Chris Mason <mason@suse.com>

From: jeffm@suse.com

reiserfs support for xattrs
parent 06803e35
......@@ -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
......
......@@ -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,
......
......@@ -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);
......
......@@ -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,
};
......@@ -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,
......
......@@ -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,
};
......@@ -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>
......@@ -358,6 +359,16 @@ 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) {
......@@ -1450,12 +1471,24 @@ 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);
......
This diff is collapsed.
#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,
};
......@@ -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 */
......@@ -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;
......
......@@ -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;
......
/*
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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