/*
* Disable extended attribute support on an FS.
*/
static int
ufs_extattr_disable(struct ufsmount *ump, int attrnamespace,
const char *attrname, struct thread *td)
{
struct ufs_extattr_list_entry *uele;
int error = 0;
if (!ufs_extattr_valid_attrname(attrnamespace, attrname))
return (EINVAL);
uele = ufs_extattr_find_attr(ump, attrnamespace, attrname);
if (!uele)
return (ENOATTR);
LIST_REMOVE(uele, uele_entries);
vn_lock(uele->uele_backing_vnode, LK_SHARED | LK_RETRY);
ASSERT_VOP_LOCKED(uele->uele_backing_vnode, "ufs_extattr_disable");
VOP_UNLOCK(uele->uele_backing_vnode, 0);
error = vn_close(uele->uele_backing_vnode, FREAD|FWRITE,
td->td_ucred, td);
free(uele, M_UFS_EXTATTR);
return (error);
}
/*
* Disable extended attribute support on an FS.
*/
static int
ufs_extattr_disable(struct ufsmount *ump, int attrnamespace,
const char *attrname, struct proc *p)
{
struct ufs_extattr_list_entry *uele;
int error = 0;
if (!ufs_extattr_valid_attrname(attrnamespace, attrname))
return (EINVAL);
uele = ufs_extattr_find_attr(ump, attrnamespace, attrname);
if (!uele)
return (ENOENT);
LIST_REMOVE(uele, uele_entries);
uele->uele_backing_vnode->v_flag &= ~VSYSTEM;
error = vn_close(uele->uele_backing_vnode, FREAD|FWRITE, p->p_ucred, p);
FREE(uele, M_UFS_EXTATTR);
return (error);
}
/*
* Real work associated with retrieving a named attribute--assumes that
* the attribute lock has already been grabbed.
*/
static int
ufs_extattr_get(struct vnode *vp, int attrnamespace, const char *name,
struct uio *uio, size_t *size, struct ucred *cred, struct thread *td)
{
struct ufs_extattr_list_entry *attribute;
struct ufs_extattr_header ueh;
struct iovec local_aiov;
struct uio local_aio;
struct mount *mp = vp->v_mount;
struct ufsmount *ump = VFSTOUFS(mp);
struct inode *ip = VTOI(vp);
off_t base_offset;
size_t len, old_len;
int error = 0;
if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED))
return (EOPNOTSUPP);
if (strlen(name) == 0)
return (EINVAL);
error = extattr_check_cred(vp, attrnamespace, cred, td, VREAD);
if (error)
return (error);
attribute = ufs_extattr_find_attr(ump, attrnamespace, name);
if (!attribute)
return (ENOATTR);
/*
* Allow only offsets of zero to encourage the read/replace
* extended attribute semantic. Otherwise we can't guarantee
* atomicity, as we don't provide locks for extended attributes.
*/
if (uio != NULL && uio->uio_offset != 0)
return (ENXIO);
/*
* Find base offset of header in file based on file header size, and
* data header size + maximum data size, indexed by inode number.
*/
base_offset = sizeof(struct ufs_extattr_fileheader) +
ip->i_number * (sizeof(struct ufs_extattr_header) +
attribute->uele_fileheader.uef_size);
/*
* Read in the data header to see if the data is defined, and if so
* how much.
*/
bzero(&ueh, sizeof(struct ufs_extattr_header));
local_aiov.iov_base = (caddr_t) &ueh;
local_aiov.iov_len = sizeof(struct ufs_extattr_header);
local_aio.uio_iov = &local_aiov;
local_aio.uio_iovcnt = 1;
local_aio.uio_rw = UIO_READ;
local_aio.uio_segflg = UIO_SYSSPACE;
local_aio.uio_td = td;
local_aio.uio_offset = base_offset;
local_aio.uio_resid = sizeof(struct ufs_extattr_header);
/*
* Acquire locks.
*
* Don't need to get a lock on the backing file if the getattr is
* being applied to the backing file, as the lock is already held.
*/
if (attribute->uele_backing_vnode != vp)
vn_lock(attribute->uele_backing_vnode, LK_SHARED | LK_RETRY);
error = VOP_READ(attribute->uele_backing_vnode, &local_aio,
IO_NODELOCKED, ump->um_extattr.uepm_ucred);
if (error)
goto vopunlock_exit;
/* Defined? */
if ((ueh.ueh_flags & UFS_EXTATTR_ATTR_FLAG_INUSE) == 0) {
error = ENOATTR;
goto vopunlock_exit;
}
/* Valid for the current inode generation? */
if (ueh.ueh_i_gen != ip->i_gen) {
/*
* The inode itself has a different generation number
* than the attribute data. For now, the best solution
* is to coerce this to undefined, and let it get cleaned
* up by the next write or extattrctl clean.
*/
printf("ufs_extattr_get (%s): inode number inconsistency (%d, %ju)\n",
mp->mnt_stat.f_mntonname, ueh.ueh_i_gen, (uintmax_t)ip->i_gen);
error = ENOATTR;
goto vopunlock_exit;
}
/* Local size consistency check. */
if (ueh.ueh_len > attribute->uele_fileheader.uef_size) {
error = ENXIO;
goto vopunlock_exit;
}
/* Return full data size if caller requested it. */
if (size != NULL)
*size = ueh.ueh_len;
/* Return data if the caller requested it. */
if (uio != NULL) {
/* Allow for offset into the attribute data. */
uio->uio_offset = base_offset + sizeof(struct
ufs_extattr_header);
/*
* Figure out maximum to transfer -- use buffer size and
* local data limit.
*/
len = MIN(uio->uio_resid, ueh.ueh_len);
old_len = uio->uio_resid;
uio->uio_resid = len;
error = VOP_READ(attribute->uele_backing_vnode, uio,
IO_NODELOCKED, ump->um_extattr.uepm_ucred);
if (error)
goto vopunlock_exit;
uio->uio_resid = old_len - (len - uio->uio_resid);
}
vopunlock_exit:
if (uio != NULL)
uio->uio_offset = 0;
if (attribute->uele_backing_vnode != vp)
VOP_UNLOCK(attribute->uele_backing_vnode, 0);
return (error);
}
/*
* Enable a named attribute on the specified filesystem; provide an
* unlocked backing vnode to hold the attribute data.
*/
static int
ufs_extattr_enable(struct ufsmount *ump, int attrnamespace,
const char *attrname, struct vnode *backing_vnode, struct thread *td)
{
struct ufs_extattr_list_entry *attribute;
struct iovec aiov;
struct uio auio;
int error = 0;
if (!ufs_extattr_valid_attrname(attrnamespace, attrname))
return (EINVAL);
if (backing_vnode->v_type != VREG)
return (EINVAL);
attribute = malloc(sizeof(struct ufs_extattr_list_entry),
M_UFS_EXTATTR, M_WAITOK);
if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) {
error = EOPNOTSUPP;
goto free_exit;
}
if (ufs_extattr_find_attr(ump, attrnamespace, attrname)) {
error = EEXIST;
goto free_exit;
}
strncpy(attribute->uele_attrname, attrname,
UFS_EXTATTR_MAXEXTATTRNAME);
attribute->uele_attrnamespace = attrnamespace;
bzero(&attribute->uele_fileheader,
sizeof(struct ufs_extattr_fileheader));
attribute->uele_backing_vnode = backing_vnode;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
aiov.iov_base = (caddr_t) &attribute->uele_fileheader;
aiov.iov_len = sizeof(struct ufs_extattr_fileheader);
auio.uio_resid = sizeof(struct ufs_extattr_fileheader);
auio.uio_offset = (off_t) 0;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_td = td;
vn_lock(backing_vnode, LK_SHARED | LK_RETRY);
error = VOP_READ(backing_vnode, &auio, IO_NODELOCKED,
ump->um_extattr.uepm_ucred);
if (error)
goto unlock_free_exit;
if (auio.uio_resid != 0) {
printf("ufs_extattr_enable: malformed attribute header\n");
error = EINVAL;
goto unlock_free_exit;
}
if (attribute->uele_fileheader.uef_magic != UFS_EXTATTR_MAGIC) {
printf("ufs_extattr_enable: invalid attribute header magic\n");
error = EINVAL;
goto unlock_free_exit;
}
if (attribute->uele_fileheader.uef_version != UFS_EXTATTR_VERSION) {
printf("ufs_extattr_enable: incorrect attribute header "
"version\n");
error = EINVAL;
goto unlock_free_exit;
}
ASSERT_VOP_LOCKED(backing_vnode, "ufs_extattr_enable");
LIST_INSERT_HEAD(&ump->um_extattr.uepm_list, attribute,
uele_entries);
VOP_UNLOCK(backing_vnode, 0);
return (0);
unlock_free_exit:
VOP_UNLOCK(backing_vnode, 0);
free_exit:
free(attribute, M_UFS_EXTATTR);
return (error);
}
/*
* Real work associated with removing an extended attribute from a vnode.
* Assumes the attribute lock has already been grabbed.
*/
static int
ufs_extattr_rm(struct vnode *vp, int attrnamespace, const char *name,
struct ucred *cred, struct thread *td)
{
struct ufs_extattr_list_entry *attribute;
struct ufs_extattr_header ueh;
struct iovec local_aiov;
struct uio local_aio;
struct mount *mp = vp->v_mount;
struct ufsmount *ump = VFSTOUFS(mp);
struct inode *ip = VTOI(vp);
off_t base_offset;
int error = 0, ioflag;
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED))
return (EOPNOTSUPP);
if (!ufs_extattr_valid_attrname(attrnamespace, name))
return (EINVAL);
error = extattr_check_cred(vp, attrnamespace, cred, td, VWRITE);
if (error)
return (error);
attribute = ufs_extattr_find_attr(ump, attrnamespace, name);
if (!attribute)
return (ENOATTR);
/*
* Find base offset of header in file based on file header size, and
* data header size + maximum data size, indexed by inode number.
*/
base_offset = sizeof(struct ufs_extattr_fileheader) +
ip->i_number * (sizeof(struct ufs_extattr_header) +
attribute->uele_fileheader.uef_size);
/*
* Check to see if currently defined.
*/
bzero(&ueh, sizeof(struct ufs_extattr_header));
local_aiov.iov_base = (caddr_t) &ueh;
local_aiov.iov_len = sizeof(struct ufs_extattr_header);
local_aio.uio_iov = &local_aiov;
local_aio.uio_iovcnt = 1;
local_aio.uio_rw = UIO_READ;
local_aio.uio_segflg = UIO_SYSSPACE;
local_aio.uio_td = td;
local_aio.uio_offset = base_offset;
local_aio.uio_resid = sizeof(struct ufs_extattr_header);
/*
* Don't need to get the lock on the backing vnode if the vnode we're
* modifying is it, as we already hold the lock.
*/
if (attribute->uele_backing_vnode != vp)
vn_lock(attribute->uele_backing_vnode, LK_EXCLUSIVE | LK_RETRY);
error = VOP_READ(attribute->uele_backing_vnode, &local_aio,
IO_NODELOCKED, ump->um_extattr.uepm_ucred);
if (error)
goto vopunlock_exit;
/* Defined? */
if ((ueh.ueh_flags & UFS_EXTATTR_ATTR_FLAG_INUSE) == 0) {
error = ENOATTR;
goto vopunlock_exit;
}
/* Valid for the current inode generation? */
if (ueh.ueh_i_gen != ip->i_gen) {
/*
* The inode itself has a different generation number than
* the attribute data. For now, the best solution is to
* coerce this to undefined, and let it get cleaned up by
* the next write or extattrctl clean.
*/
printf("ufs_extattr_rm (%s): inode number inconsistency (%d, %jd)\n",
mp->mnt_stat.f_mntonname, ueh.ueh_i_gen, (intmax_t)ip->i_gen);
error = ENOATTR;
goto vopunlock_exit;
}
/* Flag it as not in use. */
ueh.ueh_flags = 0;
ueh.ueh_len = 0;
local_aiov.iov_base = (caddr_t) &ueh;
local_aiov.iov_len = sizeof(struct ufs_extattr_header);
local_aio.uio_iov = &local_aiov;
local_aio.uio_iovcnt = 1;
local_aio.uio_rw = UIO_WRITE;
local_aio.uio_segflg = UIO_SYSSPACE;
local_aio.uio_td = td;
local_aio.uio_offset = base_offset;
local_aio.uio_resid = sizeof(struct ufs_extattr_header);
ioflag = IO_NODELOCKED;
if (ufs_extattr_sync)
ioflag |= IO_SYNC;
error = VOP_WRITE(attribute->uele_backing_vnode, &local_aio, ioflag,
ump->um_extattr.uepm_ucred);
if (error)
goto vopunlock_exit;
if (local_aio.uio_resid != 0)
error = ENXIO;
vopunlock_exit:
VOP_UNLOCK(attribute->uele_backing_vnode, 0);
return (error);
}
/*
* Real work associated with setting a vnode's extended attributes;
* assumes that the attribute lock has already been grabbed.
*/
static int
ufs_extattr_set(struct vnode *vp, int attrnamespace, const char *name,
struct uio *uio, struct ucred *cred, struct thread *td)
{
struct ufs_extattr_list_entry *attribute;
struct ufs_extattr_header ueh;
struct iovec local_aiov;
struct uio local_aio;
struct mount *mp = vp->v_mount;
struct ufsmount *ump = VFSTOUFS(mp);
struct inode *ip = VTOI(vp);
off_t base_offset;
int error = 0, ioflag;
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED))
return (EOPNOTSUPP);
if (!ufs_extattr_valid_attrname(attrnamespace, name))
return (EINVAL);
error = extattr_check_cred(vp, attrnamespace, cred, td, VWRITE);
if (error)
return (error);
attribute = ufs_extattr_find_attr(ump, attrnamespace, name);
if (!attribute)
return (ENOATTR);
/*
* Early rejection of invalid offsets/length.
* Reject: any offset but 0 (replace)
* Any size greater than attribute size limit
*/
if (uio->uio_offset != 0 ||
uio->uio_resid > attribute->uele_fileheader.uef_size)
return (ENXIO);
/*
* Find base offset of header in file based on file header size, and
* data header size + maximum data size, indexed by inode number.
*/
base_offset = sizeof(struct ufs_extattr_fileheader) +
ip->i_number * (sizeof(struct ufs_extattr_header) +
attribute->uele_fileheader.uef_size);
/*
* Write out a data header for the data.
*/
ueh.ueh_len = uio->uio_resid;
ueh.ueh_flags = UFS_EXTATTR_ATTR_FLAG_INUSE;
ueh.ueh_i_gen = ip->i_gen;
local_aiov.iov_base = (caddr_t) &ueh;
local_aiov.iov_len = sizeof(struct ufs_extattr_header);
local_aio.uio_iov = &local_aiov;
local_aio.uio_iovcnt = 1;
local_aio.uio_rw = UIO_WRITE;
local_aio.uio_segflg = UIO_SYSSPACE;
local_aio.uio_td = td;
local_aio.uio_offset = base_offset;
local_aio.uio_resid = sizeof(struct ufs_extattr_header);
/*
* Acquire locks.
*
* Don't need to get a lock on the backing file if the setattr is
* being applied to the backing file, as the lock is already held.
*/
if (attribute->uele_backing_vnode != vp)
vn_lock(attribute->uele_backing_vnode, LK_EXCLUSIVE | LK_RETRY);
ioflag = IO_NODELOCKED;
if (ufs_extattr_sync)
ioflag |= IO_SYNC;
error = VOP_WRITE(attribute->uele_backing_vnode, &local_aio, ioflag,
ump->um_extattr.uepm_ucred);
if (error)
goto vopunlock_exit;
if (local_aio.uio_resid != 0) {
error = ENXIO;
goto vopunlock_exit;
}
/*
* Write out user data.
*/
uio->uio_offset = base_offset + sizeof(struct ufs_extattr_header);
ioflag = IO_NODELOCKED;
if (ufs_extattr_sync)
ioflag |= IO_SYNC;
error = VOP_WRITE(attribute->uele_backing_vnode, uio, ioflag,
ump->um_extattr.uepm_ucred);
vopunlock_exit:
uio->uio_offset = 0;
if (attribute->uele_backing_vnode != vp)
VOP_UNLOCK(attribute->uele_backing_vnode, 0);
return (error);
}
