/*
* 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 myfs_ufs_extattr_list_entry *attribute;
struct myfs_ufs_extattr_header ueh;
struct iovec local_aiov;
struct uio local_aio;
struct mount *mp = vp->v_mount;
struct myfs_ufsmount *ump = VFSTOMYFS(mp);
struct myfs_inode *ip = MYFS_VTOI(vp);
off_t base_offset;
size_t len, old_len;
int error = 0;
if (!(ump->um_extattr.uepm_flags & MYFS_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 myfs_ufs_extattr_fileheader) +
ip->i_number * (sizeof(struct myfs_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 myfs_ufs_extattr_header));
local_aiov.iov_base = (caddr_t) &ueh;
local_aiov.iov_len = sizeof(struct myfs_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 myfs_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 & MYFS_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, %jd)\n",
mp->mnt_stat.f_mntonname, ueh.ueh_i_gen, (intmax_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
myfs_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);
}
/*
* Balloc defines the structure of filesystem storage
* by allocating the physical blocks on a device given
* the inode and the logical block number in a file.
* This is the allocation strategy for MYFS1. Below is
* the allocation strategy for MYFS2.
*/
int
myfs_ffs_balloc_ufs1(struct vnode *vp, off_t startoffset, int size,
struct ucred *cred, int flags, struct buf **bpp)
{
struct myfs_inode *ip;
struct myfs_ufs1_dinode *dp;
myfs_ufs_lbn_t lbn, lastlbn;
struct myfs_fs *fs;
myfs_ufs1_daddr_t nb;
struct buf *bp, *nbp;
struct myfs_ufsmount *ump;
struct myfs_indir indirs[MYFS_NIADDR + 2];
int deallocated, osize, nsize, num, i, error;
myfs_ufs2_daddr_t newb;
myfs_ufs1_daddr_t *bap, pref;
myfs_ufs1_daddr_t *allocib, *blkp, *allocblk, allociblk[MYFS_NIADDR + 1];
myfs_ufs2_daddr_t *lbns_remfree, lbns[MYFS_NIADDR + 1];
int unwindidx = -1;
int saved_inbdflush;
ip = MYFS_VTOI(vp);
dp = ip->i_din1;
fs = ip->i_fs;
ump = ip->i_ump;
lbn = myfs_lblkno(fs, startoffset);
size = myfs_blkoff(fs, startoffset) + size;
if (size > fs->fs_bsize)
panic("ffs_balloc_ufs1: blk too big");
*bpp = NULL;
if (flags & IO_EXT)
return (EOPNOTSUPP);
if (lbn < 0)
return (EFBIG);
/*
* If the next write will extend the file into a new block,
* and the file is currently composed of a fragment
* this fragment has to be extended to be a full block.
*/
lastlbn = myfs_lblkno(fs, ip->i_size);
if (lastlbn < MYFS_NDADDR && lastlbn < lbn) {
nb = lastlbn;
osize = myfs_blksize(fs, ip, nb);
if (osize < fs->fs_bsize && osize > 0) {
MYFS_LOCK(ump);
error = myfs_ffs_realloccg(ip, nb, dp->di_db[nb],
myfs_ffs_blkpref_ufs1(ip, lastlbn, (int)nb,
&dp->di_db[0]), osize, (int)fs->fs_bsize, flags,
cred, &bp);
if (error)
return (error);
if (MYFS_DOINGSOFTDEP(vp))
myfs_softdep_setup_allocdirect(ip, nb,
myfs_dbtofsb(fs, bp->b_blkno), dp->di_db[nb],
fs->fs_bsize, osize, bp);
ip->i_size = myfs_smalllblktosize(fs, nb + 1);
dp->di_size = ip->i_size;
dp->di_db[nb] = myfs_dbtofsb(fs, bp->b_blkno);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
if (flags & IO_SYNC)
bwrite(bp);
else
bawrite(bp);
}
}
/*
* The first MYFS_NDADDR blocks are direct blocks
*/
if (lbn < MYFS_NDADDR) {
if (flags & MYFS_BA_METAONLY)
panic("ffs_balloc_ufs1: MYFS_BA_METAONLY for direct block");
nb = dp->di_db[lbn];
if (nb != 0 && ip->i_size >= myfs_smalllblktosize(fs, lbn + 1)) {
error = bread(vp, lbn, fs->fs_bsize, NOCRED, &bp);
if (error) {
brelse(bp);
return (error);
}
bp->b_blkno = myfs_fsbtodb(fs, nb);
*bpp = bp;
return (0);
}
if (nb != 0) {
/*
* Consider need to reallocate a fragment.
*/
osize = myfs_fragroundup(fs, myfs_blkoff(fs, ip->i_size));
nsize = myfs_fragroundup(fs, size);
if (nsize <= osize) {
error = bread(vp, lbn, osize, NOCRED, &bp);
if (error) {
brelse(bp);
return (error);
}
bp->b_blkno = myfs_fsbtodb(fs, nb);
} else {
MYFS_LOCK(ump);
error = myfs_ffs_realloccg(ip, lbn, dp->di_db[lbn],
myfs_ffs_blkpref_ufs1(ip, lbn, (int)lbn,
&dp->di_db[0]), osize, nsize, flags,
cred, &bp);
if (error)
return (error);
if (MYFS_DOINGSOFTDEP(vp))
myfs_softdep_setup_allocdirect(ip, lbn,
myfs_dbtofsb(fs, bp->b_blkno), nb,
nsize, osize, bp);
}
} else {
if (ip->i_size < myfs_smalllblktosize(fs, lbn + 1))
nsize = myfs_fragroundup(fs, size);
else
nsize = fs->fs_bsize;
MYFS_LOCK(ump);
error = myfs_ffs_alloc(ip, lbn,
myfs_ffs_blkpref_ufs1(ip, lbn, (int)lbn, &dp->di_db[0]),
nsize, flags, cred, &newb);
if (error)
return (error);
bp = getblk(vp, lbn, nsize, 0, 0, 0);
bp->b_blkno = myfs_fsbtodb(fs, newb);
if (flags & MYFS_BA_CLRBUF)
vfs_bio_clrbuf(bp);
if (MYFS_DOINGSOFTDEP(vp))
myfs_softdep_setup_allocdirect(ip, lbn, newb, 0,
nsize, 0, bp);
}
dp->di_db[lbn] = myfs_dbtofsb(fs, bp->b_blkno);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
*bpp = bp;
return (0);
}
/*
* Determine the number of levels of indirection.
*/
pref = 0;
if ((error = myfs_ufs_getlbns(vp, lbn, indirs, &num)) != 0)
return(error);
#ifdef INVARIANTS
if (num < 1)
panic ("ffs_balloc_ufs1: myfs_ufs_getlbns returned indirect block");
#endif
saved_inbdflush = ~TDP_INBDFLUSH | (curthread->td_pflags &
TDP_INBDFLUSH);
curthread->td_pflags |= TDP_INBDFLUSH;
/*
* Fetch the first indirect block allocating if necessary.
*/
--num;
nb = dp->di_ib[indirs[0].in_off];
allocib = NULL;
allocblk = allociblk;
lbns_remfree = lbns;
if (nb == 0) {
MYFS_LOCK(ump);
pref = myfs_ffs_blkpref_ufs1(ip, lbn, 0, (myfs_ufs1_daddr_t *)0);
if ((error = myfs_ffs_alloc(ip, lbn, pref, (int)fs->fs_bsize,
flags, cred, &newb)) != 0) {
curthread->td_pflags &= saved_inbdflush;
return (error);
}
nb = newb;
*allocblk++ = nb;
*lbns_remfree++ = indirs[1].in_lbn;
bp = getblk(vp, indirs[1].in_lbn, fs->fs_bsize, 0, 0, 0);
bp->b_blkno = myfs_fsbtodb(fs, nb);
vfs_bio_clrbuf(bp);
if (MYFS_DOINGSOFTDEP(vp)) {
myfs_softdep_setup_allocdirect(ip, MYFS_NDADDR + indirs[0].in_off,
newb, 0, fs->fs_bsize, 0, bp);
bdwrite(bp);
} else {
/*
* Write synchronously so that indirect blocks
* never point at garbage.
*/
if (MYFS_DOINGASYNC(vp))
bdwrite(bp);
else if ((error = bwrite(bp)) != 0)
goto fail;
}
allocib = &dp->di_ib[indirs[0].in_off];
*allocib = nb;
ip->i_flag |= IN_CHANGE | IN_UPDATE;
}
/*
* Fetch through the indirect blocks, allocating as necessary.
*/
for (i = 1;;) {
error = bread(vp,
indirs[i].in_lbn, (int)fs->fs_bsize, NOCRED, &bp);
if (error) {
brelse(bp);
goto fail;
}
bap = (myfs_ufs1_daddr_t *)bp->b_data;
nb = bap[indirs[i].in_off];
if (i == num)
break;
i += 1;
if (nb != 0) {
bqrelse(bp);
continue;
}
MYFS_LOCK(ump);
if (pref == 0)
pref = myfs_ffs_blkpref_ufs1(ip, lbn, 0, (myfs_ufs1_daddr_t *)0);
if ((error = myfs_ffs_alloc(ip, lbn, pref, (int)fs->fs_bsize,
flags, cred, &newb)) != 0) {
brelse(bp);
goto fail;
}
nb = newb;
*allocblk++ = nb;
*lbns_remfree++ = indirs[i].in_lbn;
nbp = getblk(vp, indirs[i].in_lbn, fs->fs_bsize, 0, 0, 0);
nbp->b_blkno = myfs_fsbtodb(fs, nb);
vfs_bio_clrbuf(nbp);
if (MYFS_DOINGSOFTDEP(vp)) {
myfs_softdep_setup_allocindir_meta(nbp, ip, bp,
indirs[i - 1].in_off, nb);
bdwrite(nbp);
} else {
/*
* Write synchronously so that indirect blocks
* never point at garbage.
*/
if ((error = bwrite(nbp)) != 0) {
brelse(bp);
goto fail;
}
}
bap[indirs[i - 1].in_off] = nb;
if (allocib == NULL && unwindidx < 0)
unwindidx = i - 1;
/*
* If required, write synchronously, otherwise use
* delayed write.
*/
if (flags & IO_SYNC) {
bwrite(bp);
} else {
if (bp->b_bufsize == fs->fs_bsize)
bp->b_flags |= B_CLUSTEROK;
bdwrite(bp);
}
}
/*
* If asked only for the indirect block, then return it.
*/
if (flags & MYFS_BA_METAONLY) {
curthread->td_pflags &= saved_inbdflush;
*bpp = bp;
return (0);
}
/*
* Get the data block, allocating if necessary.
*/
if (nb == 0) {
MYFS_LOCK(ump);
pref = myfs_ffs_blkpref_ufs1(ip, lbn, indirs[i].in_off, &bap[0]);
error = myfs_ffs_alloc(ip,
lbn, pref, (int)fs->fs_bsize, flags, cred, &newb);
if (error) {
brelse(bp);
goto fail;
}
nb = newb;
*allocblk++ = nb;
*lbns_remfree++ = lbn;
nbp = getblk(vp, lbn, fs->fs_bsize, 0, 0, 0);
nbp->b_blkno = myfs_fsbtodb(fs, nb);
if (flags & MYFS_BA_CLRBUF)
vfs_bio_clrbuf(nbp);
if (MYFS_DOINGSOFTDEP(vp))
myfs_softdep_setup_allocindir_page(ip, lbn, bp,
indirs[i].in_off, nb, 0, nbp);
bap[indirs[i].in_off] = nb;
/*
* If required, write synchronously, otherwise use
* delayed write.
*/
if (flags & IO_SYNC) {
bwrite(bp);
} else {
if (bp->b_bufsize == fs->fs_bsize)
bp->b_flags |= B_CLUSTEROK;
bdwrite(bp);
}
curthread->td_pflags &= saved_inbdflush;
*bpp = nbp;
return (0);
}
brelse(bp);
if (flags & MYFS_BA_CLRBUF) {
int seqcount = (flags & MYFS_BA_SEQMASK) >> MYFS_BA_SEQSHIFT;
if (seqcount && (vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
error = cluster_read(vp, ip->i_size, lbn,
(int)fs->fs_bsize, NOCRED,
MAXBSIZE, seqcount, &nbp);
} else {
error = bread(vp, lbn, (int)fs->fs_bsize, NOCRED, &nbp);
}
if (error) {
brelse(nbp);
goto fail;
}
} else {
/*
* 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 myfs_ufs_extattr_list_entry *attribute;
struct myfs_ufs_extattr_header ueh;
struct iovec local_aiov;
struct uio local_aio;
struct mount *mp = vp->v_mount;
struct myfs_ufsmount *ump = VFSTOMYFS(mp);
struct myfs_inode *ip = MYFS_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 & MYFS_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 myfs_ufs_extattr_fileheader) +
ip->i_number * (sizeof(struct myfs_ufs_extattr_header) +
attribute->uele_fileheader.uef_size);
/*
* Check to see if currently defined.
*/
bzero(&ueh, sizeof(struct myfs_ufs_extattr_header));
local_aiov.iov_base = (caddr_t) &ueh;
local_aiov.iov_len = sizeof(struct myfs_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 myfs_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 & MYFS_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 myfs_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 myfs_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 myfs_ufs_extattr_list_entry *attribute;
struct myfs_ufs_extattr_header ueh;
struct iovec local_aiov;
struct uio local_aio;
struct mount *mp = vp->v_mount;
struct myfs_ufsmount *ump = VFSTOMYFS(mp);
struct myfs_inode *ip = MYFS_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 & MYFS_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 myfs_ufs_extattr_fileheader) +
ip->i_number * (sizeof(struct myfs_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 = MYFS_EXTATTR_ATTR_FLAG_INUSE;
ueh.ueh_i_gen = ip->i_gen;
local_aiov.iov_base = (caddr_t) &ueh;
local_aiov.iov_len = sizeof(struct myfs_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 myfs_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 myfs_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);
}
int
sys_setacl(struct thread *td, struct setacl_args *uap)
{
int error;
struct nameidata nd;
int i;
int index = -1;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->name, td);
if ((error = namei(&nd)) != 0)
{
return error;
}
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_vp->v_op != &myfs_ffs_vnodeops2)
{
vrele(nd.ni_vp);
uprintf("File was not in the myfs filesystem.\n");
return 0;
}
struct myfs_inode *ip = MYFS_VTOI(nd.ni_vp);
//User entry
if(uap->type == 0)
{
if(ip->i_din2->user_cnt != 0)
{
for(i = 0; i < ip->i_din2->user_cnt; i++)
{
if( ip->i_din2->user_entry[i].idnum == uap->idnum )
{
index = i;
break;
}
}
}
//Not exist,add the entry
if(ip->i_din2->user_cnt == 0 || index == -1)
{
if(uap->idnum == 0)
{
ip->i_din2->user_entry[ip->i_din2->user_cnt].idnum = td->td_ucred->cr_ruid;
}
else
{
ip->i_din2->user_entry[ip->i_din2->user_cnt].idnum = uap->idnum;
}
ip->i_din2->user_entry[ip->i_din2->user_cnt].perms = uap->perms;
ip->i_din2->user_cnt++;
}
//Existed,change the entry
else if(index >= 0)
{
//Check whether it's the owner to do the change.
if(td->td_ucred->cr_ruid != ip->i_din2->di_uid && td->td_ucred->cr_ruid != 0)
{
return EPERM;
}
ip->i_din2->user_entry[index].perms = uap->perms;
}
}
//Group entry
else if(uap->type == 1)
{
if(td->td_ucred->cr_rgid == uap->idnum || td->td_ucred->cr_ruid == 0)
{
ip->i_din2->group_entry[ip->i_din2->group_cnt].idnum = uap->idnum;
ip->i_din2->group_entry[ip->i_din2->group_cnt].perms = uap->perms;
ip->i_din2->group_cnt++;
}
else
{
return EPERM;
}
}
vrele(nd.ni_vp);
return 0;
}
int
sys_getacl(struct thread *td, struct getacl_args *uap)
{
int error;
struct nameidata nd;
int perms = -1;
int whetherintable = 0;
int i,j;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->name, td);
if ((error = namei(&nd)) != 0)
return error;
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_vp->v_op != &myfs_ffs_vnodeops2)
{
vrele(nd.ni_vp);
uprintf("File was not in the myfs filesystem.\n");
return 0;
}
struct myfs_inode *ip = MYFS_VTOI(nd.ni_vp);
if(uap->type == 0)
{
for(i = 0; i < ip->i_din2->user_cnt ; i++)
{
if(ip->i_din2->user_entry[i].idnum == uap->idnum)
{
whetherintable = 1;
break;
}
}
}
else if(uap->type == 1)
{
for(j = 0; j < ip->i_din2->group_cnt ; j++)
{
if(ip->i_din2->group_entry[j].idnum == uap->idnum)
{
whetherintable = 1;
break;
}
}
}
if(whetherintable == 0 && td->td_ucred->cr_ruid != 0)
{
td->td_retval[0] = -1;
return EPERM;
}
struct myfs_ufs2_dinode *dip = ip->i_din2;
perms = entry_find(dip,uap->type,uap->idnum);
if(perms == -1)
{
td->td_retval[0] = -1;
return ENOENT;
}
td->td_retval[0] = perms;//return the entry's permission number.
vrele(nd.ni_vp);
return 0;
}
int
sys_clearacl(struct thread *td, struct clearacl_args *uap)
{
int error;
struct nameidata nd;
int index = -1;
int i,j;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->name, td);
if ((error = namei(&nd)) != 0)
return error;
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_vp->v_op != &myfs_ffs_vnodeops2)
{
vrele(nd.ni_vp);
uprintf("File was not in the myfs filesystem.\n");
return 0;
}
struct myfs_inode *ip = MYFS_VTOI(nd.ni_vp);
struct myfs_ufs2_dinode *dip = ip->i_din2;
//index = entry_find(dip,uap->type,kern_name,uap->idnum);
if(uap->type == 0)//search user entry
{
for(i = 0; i < dip->user_cnt; i++)
{
if( dip->user_entry[i].idnum == uap->idnum )
{
index = i;
break;
}
}
if(index != -1)
{
dip->user_entry[index].idnum = 0;
dip->user_entry[index].perms = 0;
dip->user_cnt--;
//Adjust the user access control list.
if( index != 15 )
{
if(dip->user_entry[index + 1].idnum != 0)
{
for(i = index + 1; i <= dip->user_cnt; i++)
{
dip->user_entry[i-1].idnum = dip->user_entry[i].idnum;
dip->user_entry[i-1].perms = dip->user_entry[i].perms;
}
dip->user_entry[dip->user_cnt].idnum = 0;
dip->user_entry[dip->user_cnt].perms = 0;
}
}
}
}
else if(uap->type == 1)//search group entry
{
for(j = 0; j < dip->group_cnt; j++)
{
if(dip->group_entry[j].idnum == uap->idnum)
{
index = j;
break;
}
}
if(index != -1)
{
dip->group_entry[index].idnum = 0;
dip->group_entry[index].perms = 0;
dip->group_cnt--;
//Adjust the group access control list.
if(index != 15)
{
if(dip->group_entry[index + 1].idnum != 0)
{
for(j = index + 1; j <= dip->group_cnt; j++)
{
dip->group_entry[j-1].idnum = dip->group_entry[j].idnum;
dip->group_entry[j-1].perms = dip->group_entry[j].perms;
}
dip->group_entry[dip->group_cnt].idnum = 0;
dip->group_entry[dip->group_cnt].perms = 0;
}
}
}
}
vrele(nd.ni_vp);
return 0;
}