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vfs.c
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vfs.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Namjae Jeon <[email protected]>
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/backing-dev.h>
#include <linux/writeback.h>
#include <linux/xattr.h>
#include <linux/falloc.h>
#include <linux/fsnotify.h>
#include <linux/dcache.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/sched/xacct.h>
#include <linux/crc32c.h>
#include "../internal.h" /* for vfs_path_lookup */
#include "glob.h"
#include "oplock.h"
#include "connection.h"
#include "vfs.h"
#include "vfs_cache.h"
#include "smbacl.h"
#include "ndr.h"
#include "auth.h"
#include "misc.h"
#include "smb_common.h"
#include "mgmt/share_config.h"
#include "mgmt/tree_connect.h"
#include "mgmt/user_session.h"
#include "mgmt/user_config.h"
static char *extract_last_component(char *path)
{
char *p = strrchr(path, '/');
if (p && p[1] != '\0') {
*p = '\0';
p++;
} else {
p = NULL;
}
return p;
}
static void ksmbd_vfs_inherit_owner(struct ksmbd_work *work,
struct inode *parent_inode,
struct inode *inode)
{
if (!test_share_config_flag(work->tcon->share_conf,
KSMBD_SHARE_FLAG_INHERIT_OWNER))
return;
i_uid_write(inode, i_uid_read(parent_inode));
}
/**
* ksmbd_vfs_lock_parent() - lock parent dentry if it is stable
*
* the parent dentry got by dget_parent or @parent could be
* unstable, we try to lock a parent inode and lookup the
* child dentry again.
*
* the reference count of @parent isn't incremented.
*/
int ksmbd_vfs_lock_parent(struct user_namespace *user_ns, struct dentry *parent,
struct dentry *child)
{
struct dentry *dentry;
int ret = 0;
inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
dentry = lookup_one(user_ns, child->d_name.name, parent,
child->d_name.len);
if (IS_ERR(dentry)) {
ret = PTR_ERR(dentry);
goto out_err;
}
if (dentry != child) {
ret = -ESTALE;
dput(dentry);
goto out_err;
}
dput(dentry);
return 0;
out_err:
inode_unlock(d_inode(parent));
return ret;
}
int ksmbd_vfs_may_delete(struct user_namespace *user_ns,
struct dentry *dentry)
{
struct dentry *parent;
int ret;
parent = dget_parent(dentry);
ret = ksmbd_vfs_lock_parent(user_ns, parent, dentry);
if (ret) {
dput(parent);
return ret;
}
ret = inode_permission(user_ns, d_inode(parent),
MAY_EXEC | MAY_WRITE);
inode_unlock(d_inode(parent));
dput(parent);
return ret;
}
int ksmbd_vfs_query_maximal_access(struct user_namespace *user_ns,
struct dentry *dentry, __le32 *daccess)
{
struct dentry *parent;
int ret = 0;
*daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
if (!inode_permission(user_ns, d_inode(dentry), MAY_OPEN | MAY_WRITE))
*daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
FILE_WRITE_DATA | FILE_APPEND_DATA |
FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
FILE_DELETE_CHILD);
if (!inode_permission(user_ns, d_inode(dentry), MAY_OPEN | MAY_READ))
*daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
if (!inode_permission(user_ns, d_inode(dentry), MAY_OPEN | MAY_EXEC))
*daccess |= FILE_EXECUTE_LE;
parent = dget_parent(dentry);
ret = ksmbd_vfs_lock_parent(user_ns, parent, dentry);
if (ret) {
dput(parent);
return ret;
}
if (!inode_permission(user_ns, d_inode(parent), MAY_EXEC | MAY_WRITE))
*daccess |= FILE_DELETE_LE;
inode_unlock(d_inode(parent));
dput(parent);
return ret;
}
/**
* ksmbd_vfs_create() - vfs helper for smb create file
* @work: work
* @name: file name that is relative to share
* @mode: file create mode
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
{
struct path path;
struct dentry *dentry;
int err;
dentry = ksmbd_vfs_kern_path_create(work, name,
LOOKUP_NO_SYMLINKS, &path);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
if (err != -ENOENT)
pr_err("path create failed for %s, err %d\n",
name, err);
return err;
}
mode |= S_IFREG;
err = vfs_create(mnt_user_ns(path.mnt), d_inode(path.dentry),
dentry, mode, true);
if (!err) {
ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
d_inode(dentry));
} else {
pr_err("File(%s): creation failed (err:%d)\n", name, err);
}
done_path_create(&path, dentry);
return err;
}
/**
* ksmbd_vfs_mkdir() - vfs helper for smb create directory
* @work: work
* @name: directory name that is relative to share
* @mode: directory create mode
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
{
struct user_namespace *user_ns;
struct path path;
struct dentry *dentry;
int err;
dentry = ksmbd_vfs_kern_path_create(work, name,
LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
&path);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
if (err != -EEXIST)
ksmbd_debug(VFS, "path create failed for %s, err %d\n",
name, err);
return err;
}
user_ns = mnt_user_ns(path.mnt);
mode |= S_IFDIR;
err = vfs_mkdir(user_ns, d_inode(path.dentry), dentry, mode);
if (err) {
goto out;
} else if (d_unhashed(dentry)) {
struct dentry *d;
d = lookup_one(user_ns, dentry->d_name.name, dentry->d_parent,
dentry->d_name.len);
if (IS_ERR(d)) {
err = PTR_ERR(d);
goto out;
}
if (unlikely(d_is_negative(d))) {
dput(d);
err = -ENOENT;
goto out;
}
ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
dput(d);
}
out:
done_path_create(&path, dentry);
if (err)
pr_err("mkdir(%s): creation failed (err:%d)\n", name, err);
return err;
}
static ssize_t ksmbd_vfs_getcasexattr(struct user_namespace *user_ns,
struct dentry *dentry, char *attr_name,
int attr_name_len, char **attr_value)
{
char *name, *xattr_list = NULL;
ssize_t value_len = -ENOENT, xattr_list_len;
xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
if (xattr_list_len <= 0)
goto out;
for (name = xattr_list; name - xattr_list < xattr_list_len;
name += strlen(name) + 1) {
ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
if (strncasecmp(attr_name, name, attr_name_len))
continue;
value_len = ksmbd_vfs_getxattr(user_ns,
dentry,
name,
attr_value);
if (value_len < 0)
pr_err("failed to get xattr in file\n");
break;
}
out:
kvfree(xattr_list);
return value_len;
}
static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos,
size_t count)
{
ssize_t v_len;
char *stream_buf = NULL;
ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
*pos, count);
v_len = ksmbd_vfs_getcasexattr(file_mnt_user_ns(fp->filp),
fp->filp->f_path.dentry,
fp->stream.name,
fp->stream.size,
&stream_buf);
if ((int)v_len <= 0)
return (int)v_len;
if (v_len <= *pos) {
count = -EINVAL;
goto free_buf;
}
if (v_len - *pos < count)
count = v_len - *pos;
memcpy(buf, &stream_buf[*pos], count);
free_buf:
kvfree(stream_buf);
return count;
}
/**
* check_lock_range() - vfs helper for smb byte range file locking
* @filp: the file to apply the lock to
* @start: lock start byte offset
* @end: lock end byte offset
* @type: byte range type read/write
*
* Return: 0 on success, otherwise error
*/
static int check_lock_range(struct file *filp, loff_t start, loff_t end,
unsigned char type)
{
struct file_lock *flock;
struct file_lock_context *ctx = file_inode(filp)->i_flctx;
int error = 0;
if (!ctx || list_empty_careful(&ctx->flc_posix))
return 0;
spin_lock(&ctx->flc_lock);
list_for_each_entry(flock, &ctx->flc_posix, fl_list) {
/* check conflict locks */
if (flock->fl_end >= start && end >= flock->fl_start) {
if (flock->fl_type == F_RDLCK) {
if (type == WRITE) {
pr_err("not allow write by shared lock\n");
error = 1;
goto out;
}
} else if (flock->fl_type == F_WRLCK) {
/* check owner in lock */
if (flock->fl_file != filp) {
error = 1;
pr_err("not allow rw access by exclusive lock from other opens\n");
goto out;
}
}
}
}
out:
spin_unlock(&ctx->flc_lock);
return error;
}
/**
* ksmbd_vfs_read() - vfs helper for smb file read
* @work: smb work
* @fid: file id of open file
* @count: read byte count
* @pos: file pos
*
* Return: number of read bytes on success, otherwise error
*/
int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count,
loff_t *pos)
{
struct file *filp = fp->filp;
ssize_t nbytes = 0;
char *rbuf = work->aux_payload_buf;
struct inode *inode = file_inode(filp);
if (S_ISDIR(inode->i_mode))
return -EISDIR;
if (unlikely(count == 0))
return 0;
if (work->conn->connection_type) {
if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
pr_err("no right to read(%pD)\n", fp->filp);
return -EACCES;
}
}
if (ksmbd_stream_fd(fp))
return ksmbd_vfs_stream_read(fp, rbuf, pos, count);
if (!work->tcon->posix_extensions) {
int ret;
ret = check_lock_range(filp, *pos, *pos + count - 1, READ);
if (ret) {
pr_err("unable to read due to lock\n");
return -EAGAIN;
}
}
nbytes = kernel_read(filp, rbuf, count, pos);
if (nbytes < 0) {
pr_err("smb read failed, err = %zd\n", nbytes);
return nbytes;
}
filp->f_pos = *pos;
return nbytes;
}
static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
size_t count)
{
char *stream_buf = NULL, *wbuf;
struct user_namespace *user_ns = file_mnt_user_ns(fp->filp);
size_t size, v_len;
int err = 0;
ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
*pos, count);
size = *pos + count;
if (size > XATTR_SIZE_MAX) {
size = XATTR_SIZE_MAX;
count = (*pos + count) - XATTR_SIZE_MAX;
}
v_len = ksmbd_vfs_getcasexattr(user_ns,
fp->filp->f_path.dentry,
fp->stream.name,
fp->stream.size,
&stream_buf);
if ((int)v_len < 0) {
pr_err("not found stream in xattr : %zd\n", v_len);
err = (int)v_len;
goto out;
}
if (v_len < size) {
wbuf = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
if (!wbuf) {
err = -ENOMEM;
goto out;
}
if (v_len > 0)
memcpy(wbuf, stream_buf, v_len);
kvfree(stream_buf);
stream_buf = wbuf;
}
memcpy(&stream_buf[*pos], buf, count);
err = ksmbd_vfs_setxattr(user_ns,
fp->filp->f_path.dentry,
fp->stream.name,
(void *)stream_buf,
size,
0);
if (err < 0)
goto out;
fp->filp->f_pos = *pos;
err = 0;
out:
kvfree(stream_buf);
return err;
}
/**
* ksmbd_vfs_write() - vfs helper for smb file write
* @work: work
* @fid: file id of open file
* @buf: buf containing data for writing
* @count: read byte count
* @pos: file pos
* @sync: fsync after write
* @written: number of bytes written
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
char *buf, size_t count, loff_t *pos, bool sync,
ssize_t *written)
{
struct file *filp;
loff_t offset = *pos;
int err = 0;
if (work->conn->connection_type) {
if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
pr_err("no right to write(%pD)\n", fp->filp);
err = -EACCES;
goto out;
}
}
filp = fp->filp;
if (ksmbd_stream_fd(fp)) {
err = ksmbd_vfs_stream_write(fp, buf, pos, count);
if (!err)
*written = count;
goto out;
}
if (!work->tcon->posix_extensions) {
err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
if (err) {
pr_err("unable to write due to lock\n");
err = -EAGAIN;
goto out;
}
}
/* Do we need to break any of a levelII oplock? */
smb_break_all_levII_oplock(work, fp, 1);
err = kernel_write(filp, buf, count, pos);
if (err < 0) {
ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
goto out;
}
filp->f_pos = *pos;
*written = err;
err = 0;
if (sync) {
err = vfs_fsync_range(filp, offset, offset + *written, 0);
if (err < 0)
pr_err("fsync failed for filename = %pD, err = %d\n",
fp->filp, err);
}
out:
return err;
}
/**
* ksmbd_vfs_getattr() - vfs helper for smb getattr
* @work: work
* @fid: file id of open file
* @attrs: inode attributes
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
{
int err;
err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
if (err)
pr_err("getattr failed, err %d\n", err);
return err;
}
/**
* ksmbd_vfs_fsync() - vfs helper for smb fsync
* @work: work
* @fid: file id of open file
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
{
struct ksmbd_file *fp;
int err;
fp = ksmbd_lookup_fd_slow(work, fid, p_id);
if (!fp) {
pr_err("failed to get filp for fid %llu\n", fid);
return -ENOENT;
}
err = vfs_fsync(fp->filp, 0);
if (err < 0)
pr_err("smb fsync failed, err = %d\n", err);
ksmbd_fd_put(work, fp);
return err;
}
/**
* ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
* @name: directory or file name that is relative to share
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name)
{
struct user_namespace *user_ns;
struct path path;
struct dentry *parent;
int err;
if (ksmbd_override_fsids(work))
return -ENOMEM;
err = ksmbd_vfs_kern_path(work, name, LOOKUP_NO_SYMLINKS, &path, false);
if (err) {
ksmbd_debug(VFS, "can't get %s, err %d\n", name, err);
ksmbd_revert_fsids(work);
return err;
}
user_ns = mnt_user_ns(path.mnt);
parent = dget_parent(path.dentry);
err = ksmbd_vfs_lock_parent(user_ns, parent, path.dentry);
if (err) {
dput(parent);
path_put(&path);
ksmbd_revert_fsids(work);
return err;
}
if (!d_inode(path.dentry)->i_nlink) {
err = -ENOENT;
goto out_err;
}
if (S_ISDIR(d_inode(path.dentry)->i_mode)) {
err = vfs_rmdir(user_ns, d_inode(parent), path.dentry);
if (err && err != -ENOTEMPTY)
ksmbd_debug(VFS, "%s: rmdir failed, err %d\n", name,
err);
} else {
err = vfs_unlink(user_ns, d_inode(parent), path.dentry, NULL);
if (err)
ksmbd_debug(VFS, "%s: unlink failed, err %d\n", name,
err);
}
out_err:
inode_unlock(d_inode(parent));
dput(parent);
path_put(&path);
ksmbd_revert_fsids(work);
return err;
}
/**
* ksmbd_vfs_link() - vfs helper for creating smb hardlink
* @oldname: source file name
* @newname: hardlink name that is relative to share
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname,
const char *newname)
{
struct path oldpath, newpath;
struct dentry *dentry;
int err;
if (ksmbd_override_fsids(work))
return -ENOMEM;
err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath);
if (err) {
pr_err("cannot get linux path for %s, err = %d\n",
oldname, err);
goto out1;
}
dentry = ksmbd_vfs_kern_path_create(work, newname,
LOOKUP_NO_SYMLINKS | LOOKUP_REVAL,
&newpath);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
pr_err("path create err for %s, err %d\n", newname, err);
goto out2;
}
err = -EXDEV;
if (oldpath.mnt != newpath.mnt) {
pr_err("vfs_link failed err %d\n", err);
goto out3;
}
err = vfs_link(oldpath.dentry, mnt_user_ns(newpath.mnt),
d_inode(newpath.dentry),
dentry, NULL);
if (err)
ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
out3:
done_path_create(&newpath, dentry);
out2:
path_put(&oldpath);
out1:
ksmbd_revert_fsids(work);
return err;
}
static int ksmbd_validate_entry_in_use(struct dentry *src_dent)
{
struct dentry *dst_dent;
spin_lock(&src_dent->d_lock);
list_for_each_entry(dst_dent, &src_dent->d_subdirs, d_child) {
struct ksmbd_file *child_fp;
if (d_really_is_negative(dst_dent))
continue;
child_fp = ksmbd_lookup_fd_inode(d_inode(dst_dent));
if (child_fp) {
spin_unlock(&src_dent->d_lock);
ksmbd_debug(VFS, "Forbid rename, sub file/dir is in use\n");
return -EACCES;
}
}
spin_unlock(&src_dent->d_lock);
return 0;
}
static int __ksmbd_vfs_rename(struct ksmbd_work *work,
struct user_namespace *src_user_ns,
struct dentry *src_dent_parent,
struct dentry *src_dent,
struct user_namespace *dst_user_ns,
struct dentry *dst_dent_parent,
struct dentry *trap_dent,
char *dst_name)
{
struct dentry *dst_dent;
int err;
if (!work->tcon->posix_extensions) {
err = ksmbd_validate_entry_in_use(src_dent);
if (err)
return err;
}
if (d_really_is_negative(src_dent_parent))
return -ENOENT;
if (d_really_is_negative(dst_dent_parent))
return -ENOENT;
if (d_really_is_negative(src_dent))
return -ENOENT;
if (src_dent == trap_dent)
return -EINVAL;
if (ksmbd_override_fsids(work))
return -ENOMEM;
dst_dent = lookup_one(dst_user_ns, dst_name, dst_dent_parent,
strlen(dst_name));
err = PTR_ERR(dst_dent);
if (IS_ERR(dst_dent)) {
pr_err("lookup failed %s [%d]\n", dst_name, err);
goto out;
}
err = -ENOTEMPTY;
if (dst_dent != trap_dent && !d_really_is_positive(dst_dent)) {
struct renamedata rd = {
.old_mnt_userns = src_user_ns,
.old_dir = d_inode(src_dent_parent),
.old_dentry = src_dent,
.new_mnt_userns = dst_user_ns,
.new_dir = d_inode(dst_dent_parent),
.new_dentry = dst_dent,
};
err = vfs_rename(&rd);
}
if (err)
pr_err("vfs_rename failed err %d\n", err);
if (dst_dent)
dput(dst_dent);
out:
ksmbd_revert_fsids(work);
return err;
}
int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file *fp,
char *newname)
{
struct user_namespace *user_ns;
struct path dst_path;
struct dentry *src_dent_parent, *dst_dent_parent;
struct dentry *src_dent, *trap_dent, *src_child;
char *dst_name;
int err;
dst_name = extract_last_component(newname);
if (!dst_name) {
dst_name = newname;
newname = "";
}
src_dent_parent = dget_parent(fp->filp->f_path.dentry);
src_dent = fp->filp->f_path.dentry;
err = ksmbd_vfs_kern_path(work, newname,
LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
&dst_path, false);
if (err) {
ksmbd_debug(VFS, "Cannot get path for %s [%d]\n", newname, err);
goto out;
}
dst_dent_parent = dst_path.dentry;
trap_dent = lock_rename(src_dent_parent, dst_dent_parent);
dget(src_dent);
dget(dst_dent_parent);
user_ns = file_mnt_user_ns(fp->filp);
src_child = lookup_one(user_ns, src_dent->d_name.name, src_dent_parent,
src_dent->d_name.len);
if (IS_ERR(src_child)) {
err = PTR_ERR(src_child);
goto out_lock;
}
if (src_child != src_dent) {
err = -ESTALE;
dput(src_child);
goto out_lock;
}
dput(src_child);
err = __ksmbd_vfs_rename(work,
user_ns,
src_dent_parent,
src_dent,
mnt_user_ns(dst_path.mnt),
dst_dent_parent,
trap_dent,
dst_name);
out_lock:
dput(src_dent);
dput(dst_dent_parent);
unlock_rename(src_dent_parent, dst_dent_parent);
path_put(&dst_path);
out:
dput(src_dent_parent);
return err;
}
/**
* ksmbd_vfs_truncate() - vfs helper for smb file truncate
* @work: work
* @fid: file id of old file
* @size: truncate to given size
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_truncate(struct ksmbd_work *work,
struct ksmbd_file *fp, loff_t size)
{
int err = 0;
struct file *filp;
filp = fp->filp;
/* Do we need to break any of a levelII oplock? */
smb_break_all_levII_oplock(work, fp, 1);
if (!work->tcon->posix_extensions) {
struct inode *inode = file_inode(filp);
if (size < inode->i_size) {
err = check_lock_range(filp, size,
inode->i_size - 1, WRITE);
} else {
err = check_lock_range(filp, inode->i_size,
size - 1, WRITE);
}
if (err) {
pr_err("failed due to lock\n");
return -EAGAIN;
}
}
err = vfs_truncate(&filp->f_path, size);
if (err)
pr_err("truncate failed, err %d\n", err);
return err;
}
/**
* ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
* @dentry: dentry of file for listing xattrs
* @list: destination buffer
* @size: destination buffer length
*
* Return: xattr list length on success, otherwise error
*/
ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
{
ssize_t size;
char *vlist = NULL;
size = vfs_listxattr(dentry, NULL, 0);
if (size <= 0)
return size;
vlist = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
if (!vlist)
return -ENOMEM;
*list = vlist;
size = vfs_listxattr(dentry, vlist, size);
if (size < 0) {
ksmbd_debug(VFS, "listxattr failed\n");
kvfree(vlist);
*list = NULL;
}
return size;
}
static ssize_t ksmbd_vfs_xattr_len(struct user_namespace *user_ns,
struct dentry *dentry, char *xattr_name)
{
return vfs_getxattr(user_ns, dentry, xattr_name, NULL, 0);
}
/**
* ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
* @user_ns: user namespace
* @dentry: dentry of file for getting xattrs
* @xattr_name: name of xattr name to query
* @xattr_buf: destination buffer xattr value
*
* Return: read xattr value length on success, otherwise error
*/
ssize_t ksmbd_vfs_getxattr(struct user_namespace *user_ns,
struct dentry *dentry,
char *xattr_name, char **xattr_buf)
{
ssize_t xattr_len;
char *buf;
*xattr_buf = NULL;
xattr_len = ksmbd_vfs_xattr_len(user_ns, dentry, xattr_name);
if (xattr_len < 0)
return xattr_len;
buf = kmalloc(xattr_len + 1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
xattr_len = vfs_getxattr(user_ns, dentry, xattr_name,
(void *)buf, xattr_len);
if (xattr_len > 0)
*xattr_buf = buf;
else
kfree(buf);
return xattr_len;
}
/**
* ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
* @user_ns: user namespace
* @dentry: dentry to set XATTR at
* @name: xattr name for setxattr
* @value: xattr value to set
* @size: size of xattr value
* @flags: destination buffer length
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_setxattr(struct user_namespace *user_ns,
struct dentry *dentry, const char *attr_name,
void *attr_value, size_t attr_size, int flags)
{
int err;
err = vfs_setxattr(user_ns,
dentry,
attr_name,
attr_value,
attr_size,
flags);
if (err)
ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
return err;
}
/**
* ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
* @filp: file pointer for IO
* @options: smb IO options
*/
void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
{
struct address_space *mapping;
mapping = filp->f_mapping;
if (!option || !mapping)
return;
if (option & FILE_WRITE_THROUGH_LE) {
filp->f_flags |= O_SYNC;
} else if (option & FILE_SEQUENTIAL_ONLY_LE) {
filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
spin_lock(&filp->f_lock);
filp->f_mode &= ~FMODE_RANDOM;
spin_unlock(&filp->f_lock);
} else if (option & FILE_RANDOM_ACCESS_LE) {
spin_lock(&filp->f_lock);