static int
_xfs_deleteextattr(struct vop_deleteextattr_args *ap)
/*
vop_deleteextattr {
IN struct vnode *a_vp;
IN int a_attrnamespace;
IN const char *a_name;
IN struct ucred *a_cred;
IN struct thread *a_td;
};
*/
{
int error, xfs_flags;
if (ap->a_vp->v_type == VCHR)
return (EOPNOTSUPP);
if (ap->a_name[0] == '\0')
return (EINVAL);
error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
ap->a_cred, ap->a_td, VWRITE);
if (error)
return (error);
xfs_flags = 0;
if (ap->a_attrnamespace & EXTATTR_NAMESPACE_USER)
xfs_flags |= ATTR_KERNORMALS;
if (ap->a_attrnamespace & EXTATTR_NAMESPACE_SYSTEM)
xfs_flags |= ATTR_KERNROOTLS;
XVOP_ATTR_REMOVE(VPTOXFSVP(ap->a_vp), ap->a_name, xfs_flags,
ap->a_cred, error);
return (error);
}
/*
* Vnode operation to retrieve a named extended attribute.
*/
int
ffs_ea_get(void *v)
{
struct vop_getextattr_args *ap = v;
struct inode *ip;
struct fs *fs;
unsigned char *p;
int error, ealen;
ip = VTOI(ap->a_vp);
fs = ip->i_fs;
/*
* Validate the vnode. It has to be a FFS2 file, directory, or symlink.
*/
if (ip->i_fs->fs_magic != FS_UFS2_MAGIC)
return (EOPNOTSUPP);
if (ap->a_vp->v_type != VREG &&
ap->a_vp->v_type != VDIR &&
ap->a_vp->v_type != VLNK)
return (EOPNOTSUPP);
/*
* Validate credentials, read in the inode's extended attributes area,
* and make sure there is no attribute with the same name.
*/
error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, ap->a_cred,
ap->a_p, IREAD);
if (error)
return (error);
error = ffs_ea_iget(ap->a_vp, ap->a_cred, ap->a_p);
if (error)
return (error);
/* Call ffs_ea_find() to do the real job. */
ealen = ffs_ea_find(ip, ap->a_attrnamespace, ap->a_name, NULL, &p);
if (ealen >= 0) {
error = 0;
if (ap->a_size != NULL)
*ap->a_size = ealen;
else if (ap->a_uio != NULL)
error = uiomove(p, ealen, ap->a_uio);
} else
error = ENOATTR;
(void) ffs_ea_iput(ap->a_vp, 0, ap->a_cred, ap->a_p);
return (error);
}
static int
_xfs_setextattr(struct vop_setextattr_args *ap)
/*
vop_setextattr {
IN struct vnode *a_vp;
IN int a_attrnamespace;
IN const char *a_name;
INOUT struct uio *a_uio;
IN struct ucred *a_cred;
IN struct thread *a_td;
};
*/
{
char *val;
size_t vallen;
int error, xfs_flags;
if (ap->a_vp->v_type == VCHR)
return (EOPNOTSUPP);
if (ap->a_uio == NULL)
return (EINVAL);
vallen = ap->a_uio->uio_resid;
if (vallen > ATTR_MAX_VALUELEN)
return (EOVERFLOW);
if (ap->a_name[0] == '\0')
return (EINVAL);
error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
ap->a_cred, ap->a_td, VWRITE);
if (error)
return (error);
xfs_flags = 0;
if (ap->a_attrnamespace & EXTATTR_NAMESPACE_USER)
xfs_flags |= ATTR_KERNORMALS;
if (ap->a_attrnamespace & EXTATTR_NAMESPACE_SYSTEM)
xfs_flags |= ATTR_KERNROOTLS;
val = (char *)kmem_zalloc(vallen, KM_SLEEP);
if (val == NULL)
return (ENOMEM);
error = uiomove(val, (int)vallen, ap->a_uio);
if (error)
goto err_out;
XVOP_ATTR_SET(VPTOXFSVP(ap->a_vp), ap->a_name, val, vallen, xfs_flags,
ap->a_cred, error);
err_out:
kmem_free(val, vallen);
return(error);
}
static int
_xfs_getextattr(
struct vop_getextattr_args /* {
struct vnode *a_vp;
int a_attrnamespace;
const char *a_name;
struct uio *a_uio;
size_t *a_size;
struct ucred *a_cred;
struct thread *a_td;
} */ *ap)
{
int error;
char *value;
int size;
error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
ap->a_cred, ap->a_td, VREAD);
if (error)
return (error);
size = ATTR_MAX_VALUELEN;
value = (char *)kmem_zalloc(size, KM_SLEEP);
if (value == NULL)
return (ENOMEM);
XVOP_ATTR_GET(VPTOXFSVP(ap->a_vp), ap->a_name, value, &size, 1,
ap->a_cred, error);
if (ap->a_uio != NULL) {
if (ap->a_uio->uio_iov->iov_len < size)
error = ERANGE;
else
uiomove(value, size, ap->a_uio);
}
if (ap->a_size != NULL)
*ap->a_size = size;
kmem_free(value, ATTR_MAX_VALUELEN);
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);
}
/*
* 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);
}
static int
_xfs_listextattr(
struct vop_listextattr_args /* {
struct vnode *a_vp;
int a_attrnamespace;
struct uio *a_uio;
size_t *a_size;
struct ucred *a_cred;
struct thread *a_td;
} */ *ap)
{
int error;
char *buf = NULL;
int buf_len = 0;
attrlist_cursor_kern_t cursor = { 0 };
int i;
char name_len;
int attrnames_len = 0;
int xfs_flags = ATTR_KERNAMELS;
error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
ap->a_cred, ap->a_td, VREAD);
if (error)
return (error);
if (ap->a_attrnamespace & EXTATTR_NAMESPACE_USER)
xfs_flags |= ATTR_KERNORMALS;
if (ap->a_attrnamespace & EXTATTR_NAMESPACE_SYSTEM)
xfs_flags |= ATTR_KERNROOTLS;
if (ap->a_uio == NULL || ap->a_uio->uio_iov[0].iov_base == NULL) {
xfs_flags |= ATTR_KERNOVAL;
buf_len = 0;
} else {
buf = ap->a_uio->uio_iov[0].iov_base;
buf_len = ap->a_uio->uio_iov[0].iov_len;
}
XVOP_ATTR_LIST(VPTOXFSVP(ap->a_vp), buf, buf_len, xfs_flags,
&cursor, ap->a_cred, error);
if (error < 0) {
attrnames_len = -error;
error = 0;
}
if (buf == NULL)
goto done;
/*
* extattr_list expects a list of names. Each list
* entry consists of one byte for the name length, followed
* by the name (not null terminated)
*/
name_len=0;
for(i=attrnames_len-1; i > 0 ; --i) {
buf[i] = buf[i-1];
if (buf[i])
++name_len;
else {
buf[i] = name_len;
name_len = 0;
}
}
buf[0] = name_len;
if (ap->a_uio != NULL)
ap->a_uio->uio_resid -= attrnames_len;
done:
if (ap->a_size != NULL)
*ap->a_size = attrnames_len;
return (error);
}
/*
* Vnode operation to set a named attribute.
*/
int
ffs_ea_set(void *v)
{
struct vop_setextattr_args *ap = v;
struct inode *ip;
struct fs *fs;
u_int32_t prefixlen, bodylen, entrysize, pad1, pad2, pesize;
int error;
unsigned int peoffset;
unsigned char *eae, *p, *peaddr;
ip = VTOI(ap->a_vp);
fs = ip->i_fs;
/*
* Validate the vnode. It has to be a FFS2 file, directory, or symlink,
* and must reside in a writable file system.
*/
if (ip->i_fs->fs_magic != FS_UFS2_MAGIC)
return (EOPNOTSUPP);
if (ap->a_vp->v_type != VREG &&
ap->a_vp->v_type != VDIR &&
ap->a_vp->v_type != VLNK)
return (EOPNOTSUPP);
if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
/* The attribute name must be at least one byte long. */
if (strlen(ap->a_name) == 0)
return (EINVAL);
/*
* Validate credentials, read in the inode's extended attributes area,
* and make sure there is no attribute with the same name.
*/
error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, ap->a_cred,
ap->a_p, IWRITE);
if (error)
return (error);
error = ffs_ea_iget(ap->a_vp, ap->a_cred, ap->a_p);
if (error)
return (error);
/*
* Check whether an entry for the given attribute already exists, and
* get its parameters.
*/
peaddr = NULL;
pesize = peoffset = 0;
(void) ffs_ea_find(ip, ap->a_attrnamespace, ap->a_name, &peaddr, NULL);
if (peaddr != NULL) {
/*
* Get absolute offset of entry. Make sure it is within the
* extended attribute area.
*/
peoffset = peaddr - ip->i_ea_area;
if (peoffset >= ip->i_ea_len) {
(void) ffs_ea_iput(ap->a_vp, 0, ap->a_cred, ap->a_p);
return (EINVAL);
}
/*
* Get size of entry. Make sure it is a sane value.
*/
bcopy(peaddr, &pesize, sizeof(pesize));
if (peoffset + pesize > ip->i_ea_len) {
(void) ffs_ea_iput(ap->a_vp, 0, ap->a_cred, ap->a_p);
return (EINVAL);
}
}
/*
* Start constructing the extended attribute entry in memory. An entry
* is made up of the following fields, laid out in top/bottom order:
*
* +-----------------------------+---------+
* | | 1. Record size | 4 bytes |
* | | 2. Attribute name space | 1 byte |
* | | 3. Length of second padding | 1 byte |
* | | 4. Length of attribute name | 1 byte |
* | +-----------------------------+---------+
* | | 5. Attribute name |
* | | 6. First padding |
* | | 7. Attribute content |
* V | 8. Second padding |
* +-----------------------------+
*
* The first 5 fields have their length computed in 'prefixlen'. Based
* on this value, the first padding is calculated. Likewise, the 7th
* field (the attribute content) has its length computed in 'bodylen',
* based on which the second padding is calculated. The complete entry
* length is computed in 'entrysize'.
*/
prefixlen = sizeof(u_int32_t) + 3 + strlen(ap->a_name);
pad1 = 8 - (prefixlen % 8);
if (pad1 == 8)
pad1 = 0;
bodylen = ap->a_uio->uio_resid;
pad2 = 8 - (bodylen % 8);
if (pad2 == 8)
pad2 = 0;
entrysize = prefixlen + pad1 + bodylen + pad2;
/*
* Make sure we're not crossing the limit for extended attributes.
* Account for the released space of previous entries (which will be
* removed in favour of the new one).
*/
if (ip->i_ea_len + entrysize - pesize > NXADDR * fs->fs_bsize) {
ffs_ea_iput(ap->a_vp, 0, ap->a_cred, ap->a_p);
return (ENOSPC);
}
eae = malloc(ip->i_ea_len + entrysize - pesize, M_TEMP,
M_WAITOK | M_CANFAIL);
if (eae == NULL) {
ffs_ea_iput(ap->a_vp, 0, ap->a_cred, ap->a_p);
return (ENOMEM);
}
/* Find out where to store the entry in the extended attribute area. */
if (peaddr != NULL) {
if (pesize == entrysize) {
/* Previous entry of same size. Just overwrite it. */
bcopy(ip->i_ea_area, eae, ip->i_ea_len);
p = eae + peoffset;
} else {
/*
* Previous entry of different size. Skip it when
* copying contents, and insert new entry at the end.
*/
bcopy(ip->i_ea_area, eae, peoffset);
bcopy(peaddr + pesize, eae + peoffset,
ip->i_ea_len - peoffset - pesize);
p = eae + ip->i_ea_len - pesize;
}
} else {
/* New entry. Insert at the end. */
bcopy(ip->i_ea_area, eae, ip->i_ea_len);
p = eae + ip->i_ea_len;
}
/* Prefix (1st-5th fields). */
bcopy(&entrysize, p, sizeof(entrysize));
p += sizeof(entrysize);
*p++ = ap->a_attrnamespace;
*p++ = pad2;
*p++ = strlen(ap->a_name);
bcopy(ap->a_name, p, strlen(ap->a_name));
p += strlen(ap->a_name);
/* Paddings and content (6th-8th fields). */
bzero(p, pad1);
p += pad1;
error = uiomove(p, bodylen, ap->a_uio);
if (error) {
free(eae, M_TEMP);
ffs_ea_iput(ap->a_vp, 0, ap->a_cred, ap->a_p);
return (error);
}
p += bodylen;
bzero(p, pad2);
/*
* Swap old extended attributes area with new one, and write it out.
*/
free(ip->i_ea_area, M_TEMP);
ip->i_ea_area = eae;
ip->i_ea_len += entrysize - pesize;
return (ffs_ea_iput(ap->a_vp, 1, ap->a_cred, ap->a_p));
}
/*
* Vnode operation to retrieve extended attributes on a vnode.
*/
int
ffs_ea_list(void *v)
{
struct vop_listextattr_args *ap = v;
struct inode *ip;
struct fs *fs;
unsigned char *p, *pend, *pnext;
u_int32_t rz;
int error, attrnamelen;
ip = VTOI(ap->a_vp);
fs = ip->i_fs;
/*
* Validate the vnode. It has to be a FFS2 file, directory, or symlink.
*/
if (ip->i_fs->fs_magic != FS_UFS2_MAGIC)
return (EOPNOTSUPP);
if (ap->a_vp->v_type != VREG &&
ap->a_vp->v_type != VDIR &&
ap->a_vp->v_type != VLNK)
return (EOPNOTSUPP);
/*
* Validate credentials and read in the inode's extended attributes
* area.
*/
error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, ap->a_cred,
ap->a_p, IREAD);
if (error)
return (error);
error = ffs_ea_iget(ap->a_vp, ap->a_cred, ap->a_p);
if (error)
return (error);
error = 0;
if (ap->a_size != NULL)
*ap->a_size = 0;
pend = ip->i_ea_area + ip->i_ea_len;
/*
* See comment in ffs_ea_set() for a detailed description of how
* extended attribute entries are laid out.
*/
for(p = (unsigned char *)ip->i_ea_area; p < pend; p = pnext) {
/*
* Read in the record size, set pointer to next entry. Make
* sure this is an entry belonging to the attribute space we
* are interesting in, and copy the attribute name over.
*/
bcopy(p, &rz, sizeof(rz));
pnext = p + rz;
if (pnext > pend)
break; /* Stepping out of extended attribute area. */
p += sizeof(rz);
if (*p++ != ap->a_attrnamespace)
continue;
p++; /* Skip length of second padding. */
attrnamelen = (int)*p;
if (ap->a_size != NULL)
*ap->a_size += attrnamelen + 1;
else if (ap->a_uio != NULL) {
error = uiomove(p, attrnamelen + 1, ap->a_uio);
if (error) {
ffs_ea_iput(ap->a_vp, 0, ap->a_cred, ap->a_p);
return (error);
}
}
}
return (ffs_ea_iput(ap->a_vp, 0, ap->a_cred, ap->a_p));
}
/*
* Vnode operation to remove a named attribute.
*/
int
ffs_ea_del(void *v)
{
struct vop_deleteextattr_args *ap = v;
struct inode *ip;
int error, olen;
u_int32_t esize;
unsigned int eoffset;
unsigned char *eae, *eaddr;
ip = VTOI(ap->a_vp);
/*
* Validate the vnode. It has to be a FFS2 file, directory, or symlink,
* and must reside in a writable file system.
*/
if (ip->i_fs->fs_magic != FS_UFS2_MAGIC)
return (EOPNOTSUPP);
if (ap->a_vp->v_type != VREG &&
ap->a_vp->v_type != VDIR &&
ap->a_vp->v_type != VLNK)
return (EOPNOTSUPP);
if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
/* The attribute name must be at least one byte long. */
if (strlen(ap->a_name) == 0)
return (EINVAL);
/*
* Validate credentials, read in the inode's extended attributes area,
* and make sure there is an attribute with the given name.
*/
error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, ap->a_cred,
ap->a_p, IWRITE);
if (error)
return (error);
error = ffs_ea_iget(ap->a_vp, ap->a_cred, ap->a_p);
if (error)
return (error);
olen = ffs_ea_find(ip, ap->a_attrnamespace, ap->a_name, &eaddr, NULL);
if (olen == -1) {
/* No such attribute. */
(void) ffs_ea_iput(ap->a_vp, 0, ap->a_cred, ap->a_p);
return (ENOATTR);
}
/*
* Get absolute offset of entry. Make sure it is within the extended
* attribute area.
*/
eoffset = eaddr - ip->i_ea_area;
if (eoffset >= ip->i_ea_len) {
(void) ffs_ea_iput(ap->a_vp, 0, ap->a_cred, ap->a_p);
return (EINVAL);
}
/*
* Get size of entry. Make sure it is a sane value.
*/
bcopy(eaddr, &esize, sizeof(esize));
if (eoffset + esize > ip->i_ea_len) {
(void) ffs_ea_iput(ap->a_vp, 0, ap->a_cred, ap->a_p);
return (EINVAL);
}
/*
* Allocate a new extended attribute area and copy the contents over,
* skipping the entry found.
*/
eae = malloc(ip->i_ea_len - esize, M_TEMP, M_WAITOK | M_CANFAIL);
if (eae == NULL) {
(void) ffs_ea_iput(ap->a_vp, 0, ap->a_cred, ap->a_p);
return (ENOMEM);
}
bcopy(ip->i_ea_area, eae, eoffset);
bcopy(eaddr + esize, eae + eoffset, ip->i_ea_len - eoffset - esize);
free(ip->i_ea_area, M_TEMP);
ip->i_ea_area = eae;
ip->i_ea_len -= esize;
return (ffs_ea_iput(ap->a_vp, 1, ap->a_cred, ap->a_p));
}
