mirror of https://gitee.com/openkylin/linux.git
1270 lines
32 KiB
C
1270 lines
32 KiB
C
/*
|
|
* linux/fs/reiserfs/xattr.c
|
|
*
|
|
* Copyright (c) 2002 by Jeff Mahoney, <jeffm@suse.com>
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* In order to implement EA/ACLs 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/system.posix_acl_access
|
|
* /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_default
|
|
* /.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.
|
|
*
|
|
* In the case of system.posix_acl_access and system.posix_acl_default, since
|
|
* these are special cases for filesystem ACLs, they are interpreted by the
|
|
* kernel, in addition, they are negatively and positively cached and attached
|
|
* to the inode so that unnecessary lookups are avoided.
|
|
*/
|
|
|
|
#include <linux/reiserfs_fs.h>
|
|
#include <linux/capability.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/reiserfs_acl.h>
|
|
#include <asm/uaccess.h>
|
|
#include <net/checksum.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/stat.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);
|
|
|
|
/* Returns the dentry referring to the root of the extended attribute
|
|
* directory tree. If it has already been retrieved, it is used. If it
|
|
* hasn't been created and the flags indicate creation is allowed, we
|
|
* attempt to create it. On error, we return a pointer-encoded error.
|
|
*/
|
|
static struct dentry *get_xa_root(struct super_block *sb, int flags)
|
|
{
|
|
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(-ENODATA);
|
|
|
|
mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR);
|
|
if (REISERFS_SB(sb)->xattr_root) {
|
|
xaroot = dget(REISERFS_SB(sb)->xattr_root);
|
|
goto out;
|
|
}
|
|
|
|
xaroot = lookup_one_len(XAROOT_NAME, privroot, strlen(XAROOT_NAME));
|
|
if (IS_ERR(xaroot)) {
|
|
goto out;
|
|
} else if (!xaroot->d_inode) {
|
|
int err = -ENODATA;
|
|
if (flags == 0 || flags & XATTR_CREATE)
|
|
err = privroot->d_inode->i_op->mkdir(privroot->d_inode,
|
|
xaroot, 0700);
|
|
if (err) {
|
|
dput(xaroot);
|
|
xaroot = ERR_PTR(err);
|
|
goto out;
|
|
}
|
|
}
|
|
REISERFS_SB(sb)->xattr_root = dget(xaroot);
|
|
|
|
out:
|
|
mutex_unlock(&privroot->d_inode->i_mutex);
|
|
dput(privroot);
|
|
return xaroot;
|
|
}
|
|
|
|
/* 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, flags);
|
|
if (IS_ERR(xaroot))
|
|
return xaroot;
|
|
|
|
/* 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);
|
|
}
|
|
}
|
|
|
|
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_CAST(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_CAST(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_mutex 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;
|
|
}
|
|
}
|
|
|
|
out:
|
|
dput(xadir);
|
|
if (err)
|
|
xafile = ERR_PTR(err);
|
|
else if (!xafile->d_inode) {
|
|
dput(xafile);
|
|
xafile = ERR_PTR(-ENODATA);
|
|
}
|
|
return xafile;
|
|
}
|
|
|
|
/*
|
|
* 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_mutex held, so there are no worries about the directory
|
|
* changing underneath us.
|
|
*/
|
|
static int __xattr_readdir(struct inode *inode, void *dirent, filldir_t filldir)
|
|
{
|
|
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(inode->i_sb, "not direntry %h", 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 = kmalloc(d_reclen, GFP_NOFS);
|
|
if (!local_buf) {
|
|
pathrelse(&path_to_entry);
|
|
return -ENOMEM;
|
|
}
|
|
if (item_moved(&tmp_ih, &path_to_entry)) {
|
|
kfree(local_buf);
|
|
|
|
/* 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) {
|
|
kfree(local_buf);
|
|
}
|
|
goto end;
|
|
}
|
|
if (local_buf != small_buf) {
|
|
kfree(local_buf);
|
|
}
|
|
} /* 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 inode *inode, filldir_t filler, void *buf)
|
|
{
|
|
int res = -ENOENT;
|
|
mutex_lock_nested(&inode->i_mutex, I_MUTEX_XATTR);
|
|
if (!IS_DEADDIR(inode)) {
|
|
lock_kernel();
|
|
res = __xattr_readdir(inode, buf, filler);
|
|
unlock_kernel();
|
|
}
|
|
mutex_unlock(&inode->i_mutex);
|
|
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_set_gfp_mask(mapping, GFP_NOFS);
|
|
page = read_mapping_page(mapping, n, NULL);
|
|
if (!IS_ERR(page)) {
|
|
kmap(page);
|
|
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);
|
|
}
|
|
|
|
int reiserfs_commit_write(struct file *f, struct page *page,
|
|
unsigned from, unsigned to);
|
|
int reiserfs_prepare_write(struct file *f, struct page *page,
|
|
unsigned from, unsigned to);
|
|
|
|
|
|
/* Generic extended attribute operations that can be used by xa plugins */
|
|
|
|
/*
|
|
* inode->i_mutex: down
|
|
*/
|
|
int
|
|
reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
|
|
size_t buffer_size, int flags)
|
|
{
|
|
int err = 0;
|
|
struct dentry *dentry;
|
|
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 (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:
|
|
dentry = get_xa_file_dentry(inode, name, flags);
|
|
if (IS_ERR(dentry)) {
|
|
err = PTR_ERR(dentry);
|
|
goto out;
|
|
}
|
|
|
|
xinode = dentry->d_inode;
|
|
REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
|
|
|
|
/* we need to copy it off.. */
|
|
if (xinode->i_nlink > 1) {
|
|
dput(dentry);
|
|
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;
|
|
mutex_lock_nested(&xinode->i_mutex, I_MUTEX_XATTR);
|
|
err = notify_change(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 = reiserfs_prepare_write(NULL, page, page_offset,
|
|
page_offset + chunk + skip);
|
|
if (!err) {
|
|
if (buffer)
|
|
memcpy(data + skip, buffer + buffer_pos, chunk);
|
|
err = reiserfs_commit_write(NULL, 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;
|
|
}
|
|
|
|
/* We can't mark the inode dirty if it's not hashed. This is the case
|
|
* when we're inheriting the default ACL. If we dirty it, the inode
|
|
* gets marked dirty, but won't (ever) make it onto the dirty list until
|
|
* it's synced explicitly to clear I_DIRTY. This is bad. */
|
|
if (!hlist_unhashed(&inode->i_hash)) {
|
|
inode->i_ctime = CURRENT_TIME_SEC;
|
|
mark_inode_dirty(inode);
|
|
}
|
|
|
|
out_filp:
|
|
mutex_unlock(&xinode->i_mutex);
|
|
dput(dentry);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* inode->i_mutex: down
|
|
*/
|
|
int
|
|
reiserfs_xattr_get(const struct inode *inode, const char *name, void *buffer,
|
|
size_t buffer_size)
|
|
{
|
|
ssize_t err = 0;
|
|
struct dentry *dentry;
|
|
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;
|
|
|
|
dentry = get_xa_file_dentry(inode, name, FL_READONLY);
|
|
if (IS_ERR(dentry)) {
|
|
err = PTR_ERR(dentry);
|
|
goto out;
|
|
}
|
|
|
|
xinode = dentry->d_inode;
|
|
isize = xinode->i_size;
|
|
REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
|
|
|
|
/* 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(inode->i_sb,
|
|
"Invalid magic for xattr (%s) "
|
|
"associated with %k", name,
|
|
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(inode->i_sb,
|
|
"Invalid hash for xattr (%s) associated "
|
|
"with %k", name, INODE_PKEY(inode));
|
|
err = -EIO;
|
|
}
|
|
|
|
out_dput:
|
|
dput(dentry);
|
|
|
|
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(dir->i_sb, "OID %08x [%.*s/%.*s] doesn't have "
|
|
"priv flag set [parent is %sset].",
|
|
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;
|
|
|
|
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);
|
|
|
|
if (!err) {
|
|
inode->i_ctime = CURRENT_TIME_SEC;
|
|
mark_inode_dirty(inode);
|
|
}
|
|
|
|
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, u64 ino, unsigned int d_type)
|
|
{
|
|
struct dentry *xadir = (struct dentry *)buf;
|
|
|
|
return __reiserfs_xattr_del(xadir, name, namelen);
|
|
|
|
}
|
|
|
|
/* This is called w/ inode->i_mutex downed */
|
|
int reiserfs_delete_xattrs(struct inode *inode)
|
|
{
|
|
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;
|
|
}
|
|
|
|
lock_kernel();
|
|
err = xattr_readdir(dir->d_inode, 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, XATTR_REPLACE);
|
|
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(inode->i_sb,
|
|
"Couldn't remove all entries in directory");
|
|
}
|
|
unlock_kernel();
|
|
|
|
out_dir:
|
|
dput(dir);
|
|
|
|
out:
|
|
if (!err)
|
|
REISERFS_I(inode)->i_flags =
|
|
REISERFS_I(inode)->i_flags & ~i_has_xattr_dir;
|
|
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, u64 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 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;
|
|
}
|
|
|
|
lock_kernel();
|
|
|
|
attrs->ia_valid &= (ATTR_UID | ATTR_GID | ATTR_CTIME);
|
|
buf.xadir = dir;
|
|
buf.attrs = attrs;
|
|
buf.inode = inode;
|
|
|
|
err = xattr_readdir(dir->d_inode, reiserfs_chown_xattrs_filler, &buf);
|
|
if (err) {
|
|
unlock_kernel();
|
|
goto out_dir;
|
|
}
|
|
|
|
err = notify_change(dir, attrs);
|
|
unlock_kernel();
|
|
|
|
out_dir:
|
|
dput(dir);
|
|
|
|
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_mutex
|
|
*/
|
|
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;
|
|
|
|
reiserfs_read_lock_xattr_i(dentry->d_inode);
|
|
reiserfs_read_lock_xattrs(dentry->d_sb);
|
|
err = xah->get(dentry->d_inode, name, buffer, size);
|
|
reiserfs_read_unlock_xattrs(dentry->d_sb);
|
|
reiserfs_read_unlock_xattr_i(dentry->d_inode);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Inode operation setxattr()
|
|
*
|
|
* dentry->d_inode->i_mutex 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;
|
|
int lock;
|
|
|
|
if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
|
|
get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
|
|
return -EOPNOTSUPP;
|
|
|
|
reiserfs_write_lock_xattr_i(dentry->d_inode);
|
|
lock = !has_xattr_dir(dentry->d_inode);
|
|
if (lock)
|
|
reiserfs_write_lock_xattrs(dentry->d_sb);
|
|
else
|
|
reiserfs_read_lock_xattrs(dentry->d_sb);
|
|
err = xah->set(dentry->d_inode, name, value, size, flags);
|
|
if (lock)
|
|
reiserfs_write_unlock_xattrs(dentry->d_sb);
|
|
else
|
|
reiserfs_read_unlock_xattrs(dentry->d_sb);
|
|
reiserfs_write_unlock_xattr_i(dentry->d_inode);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Inode operation removexattr()
|
|
*
|
|
* dentry->d_inode->i_mutex 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;
|
|
|
|
reiserfs_write_lock_xattr_i(dentry->d_inode);
|
|
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_SEC;
|
|
mark_inode_dirty(dentry->d_inode);
|
|
|
|
out:
|
|
reiserfs_read_unlock_xattrs(dentry->d_sb);
|
|
reiserfs_write_unlock_xattr_i(dentry->d_inode);
|
|
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, u64 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_mutex
|
|
*/
|
|
ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
|
|
{
|
|
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;
|
|
|
|
reiserfs_read_lock_xattr_i(dentry->d_inode);
|
|
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;
|
|
}
|
|
|
|
buf.r_buf = buffer;
|
|
buf.r_size = buffer ? size : 0;
|
|
buf.r_pos = 0;
|
|
buf.r_inode = dentry->d_inode;
|
|
|
|
REISERFS_I(dentry->d_inode)->i_flags |= i_has_xattr_dir;
|
|
|
|
err = xattr_readdir(dir->d_inode, 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:
|
|
dput(dir);
|
|
|
|
out:
|
|
reiserfs_read_unlock_xattr_i(dentry->d_inode);
|
|
return err;
|
|
}
|
|
|
|
/* This is the implementation for the xattr plugin infrastructure */
|
|
static LIST_HEAD(xattr_handlers);
|
|
static DEFINE_RWLOCK(handler_lock);
|
|
|
|
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);
|
|
list_add_tail(&trusted_handler.handlers, &xattr_handlers);
|
|
#ifdef CONFIG_REISERFS_FS_SECURITY
|
|
list_add_tail(&security_handler.handlers, &xattr_handlers);
|
|
#endif
|
|
#ifdef CONFIG_REISERFS_FS_POSIX_ACL
|
|
list_add_tail(&posix_acl_access_handler.handlers, &xattr_handlers);
|
|
list_add_tail(&posix_acl_default_handler.handlers, &xattr_handlers);
|
|
#endif
|
|
|
|
/* 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;
|
|
} else if (q1->len == name->len &&
|
|
!memcmp(q1->name, name->name, name->len))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
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(s, "xattrs/ACLs not supported on pre v3.6 "
|
|
"format filesystem. Failing mount.");
|
|
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;
|
|
mutex_lock_nested(&inode->i_mutex,
|
|
I_MUTEX_XATTR);
|
|
err = inode->i_op->mkdir(inode, dentry, 0700);
|
|
mutex_unlock(&inode->i_mutex);
|
|
if (err) {
|
|
dput(dentry);
|
|
dentry = NULL;
|
|
}
|
|
|
|
if (dentry && dentry->d_inode)
|
|
reiserfs_warning(s,
|
|
"Created %s on %s - reserved for "
|
|
"xattr storage.",
|
|
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_mark_inode_private(dentry->d_inode);
|
|
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(s, "xattrs/ACLs enabled and couldn't "
|
|
"find/create .reiserfs_priv. Failing mount.");
|
|
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));
|
|
clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt));
|
|
}
|
|
|
|
/* The super_block MS_POSIXACL must mirror the (no)acl mount option. */
|
|
s->s_flags = s->s_flags & ~MS_POSIXACL;
|
|
if (reiserfs_posixacl(s))
|
|
s->s_flags |= MS_POSIXACL;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int reiserfs_check_acl(struct inode *inode, int mask)
|
|
{
|
|
struct posix_acl *acl;
|
|
int error = -EAGAIN; /* do regular unix permission checks by default */
|
|
|
|
reiserfs_read_lock_xattr_i(inode);
|
|
reiserfs_read_lock_xattrs(inode->i_sb);
|
|
|
|
acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
|
|
|
|
reiserfs_read_unlock_xattrs(inode->i_sb);
|
|
reiserfs_read_unlock_xattr_i(inode);
|
|
|
|
if (acl) {
|
|
if (!IS_ERR(acl)) {
|
|
error = posix_acl_permission(inode, acl, mask);
|
|
posix_acl_release(acl);
|
|
} else if (PTR_ERR(acl) != -ENODATA)
|
|
error = PTR_ERR(acl);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
int reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd)
|
|
{
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* Stat data v1 doesn't support ACLs.
|
|
*/
|
|
if (get_inode_sd_version(inode) == STAT_DATA_V1)
|
|
return generic_permission(inode, mask, NULL);
|
|
else
|
|
return generic_permission(inode, mask, reiserfs_check_acl);
|
|
}
|