/*
* Go through the disk queues to initiate sandbagged IO;
* go through the inodes to write those that have been modified;
* initiate the writing of the super block if it has been modified.
*
* Note: we are always called with the filesystem marked `MPBUSY'.
*/
int
ext2fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vnode *vp;
struct ufsmount *ump = VFSTOUFS(mp);
struct m_ext2fs *fs;
struct vnode_iterator *marker;
int error, allerror = 0;
fs = ump->um_e2fs;
if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */
printf("fs = %s\n", fs->e2fs_fsmnt);
panic("update: rofs mod");
}
/*
* Write back each (modified) inode.
*/
vfs_vnode_iterator_init(mp, &marker);
while ((vp = vfs_vnode_iterator_next(marker, ext2fs_sync_selector,
NULL)))
{
error = vn_lock(vp, LK_EXCLUSIVE);
if (error) {
vrele(vp);
continue;
}
if (vp->v_type == VREG && waitfor == MNT_LAZY)
error = ext2fs_update(vp, NULL, NULL, 0);
else
error = VOP_FSYNC(vp, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0);
if (error)
allerror = error;
vput(vp);
}
vfs_vnode_iterator_destroy(marker);
/*
* Force stale file system control information to be flushed.
*/
if (waitfor != MNT_LAZY) {
vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
if ((error = VOP_FSYNC(ump->um_devvp, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0)
allerror = error;
VOP_UNLOCK(ump->um_devvp);
}
/*
* Write back modified superblock.
*/
if (fs->e2fs_fmod != 0) {
fs->e2fs_fmod = 0;
fs->e2fs.e2fs_wtime = time_second;
if ((error = ext2fs_cgupdate(ump, waitfor)))
allerror = error;
}
return (allerror);
}
/*
* link vnode call
*/
int
ext2fs_link(void *v)
{
struct vop_link_args *ap = v;
struct vnode *dvp = ap->a_dvp;
struct vnode *vp = ap->a_vp;
struct componentname *cnp = ap->a_cnp;
struct proc *p = cnp->cn_proc;
struct inode *ip;
int error;
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ext2fs_link: no name");
#endif
if (vp->v_type == VDIR) {
VOP_ABORTOP(dvp, cnp);
error = EISDIR;
goto out2;
}
if (dvp->v_mount != vp->v_mount) {
VOP_ABORTOP(dvp, cnp);
error = EXDEV;
goto out2;
}
if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE, p))) {
VOP_ABORTOP(dvp, cnp);
goto out2;
}
ip = VTOI(vp);
if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) {
VOP_ABORTOP(dvp, cnp);
error = EMLINK;
goto out1;
}
if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) {
VOP_ABORTOP(dvp, cnp);
error = EPERM;
goto out1;
}
ip->i_e2fs_nlink++;
ip->i_flag |= IN_CHANGE;
error = ext2fs_update(ip, NULL, NULL, 1);
if (!error)
error = ext2fs_direnter(ip, dvp, cnp);
if (error) {
ip->i_e2fs_nlink--;
ip->i_flag |= IN_CHANGE;
}
pool_put(&namei_pool, cnp->cn_pnbuf);
out1:
if (dvp != vp)
VOP_UNLOCK(vp, 0);
out2:
vput(dvp);
return (error);
}
/* ARGSUSED */
int
ext2fs_fsync(void *v)
{
struct vop_fsync_args *ap = v;
struct vnode *vp = ap->a_vp;
vflushbuf(vp, ap->a_waitfor == MNT_WAIT);
return (ext2fs_update(VTOI(ap->a_vp), ap->a_waitfor == MNT_WAIT));
}
/*
* Last reference to an inode. If necessary, write or delete it.
*/
int
ext2fs_inactive(void *v)
{
struct vop_inactive_args *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct proc *p = ap->a_p;
struct timespec ts;
int error = 0;
#ifdef DIAGNOSTIC
extern int prtactive;
if (prtactive && vp->v_usecount != 0)
vprint("ext2fs_inactive: pushing active", vp);
#endif
/* Get rid of inodes related to stale file handles. */
if (ip->i_e2din == NULL || ip->i_e2fs_mode == 0 || ip->i_e2fs_dtime)
goto out;
error = 0;
if (ip->i_e2fs_nlink == 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
if (ext2fs_size(ip) != 0) {
error = ext2fs_truncate(ip, (off_t)0, 0, NOCRED);
}
getnanotime(&ts);
ip->i_e2fs_dtime = ts.tv_sec;
ip->i_flag |= IN_CHANGE | IN_UPDATE;
ext2fs_inode_free(ip, ip->i_number, ip->i_e2fs_mode);
}
if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) {
ext2fs_update(ip, 0);
}
out:
VOP_UNLOCK(vp, p);
/*
* If we are done with the inode, reclaim it
* so that it can be reused immediately.
*/
if (ip->i_e2din == NULL || ip->i_e2fs_dtime != 0)
vrecycle(vp, p);
return (error);
}
/*
* Set attribute vnode op. called from several syscalls
*/
int
ext2fs_setattr(void *v)
{
struct vop_setattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
} */ *ap = v;
struct vattr *vap = ap->a_vap;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
kauth_cred_t cred = ap->a_cred;
struct lwp *l = curlwp;
int error;
kauth_action_t action = KAUTH_VNODE_WRITE_FLAGS;
bool changing_sysflags = false;
/*
* Check for unsettable attributes.
*/
if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) ||
(vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
(vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
return (EINVAL);
}
if (vap->va_flags != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
/*
* Check if we're allowed to change the flags.
* If EXT2FS_SYSTEM_FLAGS is set, then the flags are treated
* as system flags, otherwise they're considered to be user
* flags.
*/
#ifdef EXT2FS_SYSTEM_FLAGS
/* Indicate we're changing system flags if we are. */
if ((vap->va_flags & SF_APPEND) ||
(vap->va_flags & SF_IMMUTABLE)) {
action |= KAUTH_VNODE_WRITE_SYSFLAGS;
changing_sysflags = true;
}
/* Indicate the node has system flags if it does. */
if (ip->i_e2fs_flags & (EXT2_APPEND | EXT2_IMMUTABLE)) {
action |= KAUTH_VNODE_HAS_SYSFLAGS;
}
#endif /* EXT2FS_SYSTEM_FLAGS */
error = kauth_authorize_vnode(cred, action, vp, NULL,
genfs_can_chflags(cred, vp->v_type, ip->i_uid,
changing_sysflags));
if (error)
return (error);
#ifdef EXT2FS_SYSTEM_FLAGS
ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE);
ip->i_e2fs_flags |=
(vap->va_flags & SF_APPEND) ? EXT2_APPEND : 0 |
(vap->va_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0;
#else
ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE);
ip->i_e2fs_flags |=
(vap->va_flags & UF_APPEND) ? EXT2_APPEND : 0 |
(vap->va_flags & UF_IMMUTABLE) ? EXT2_IMMUTABLE : 0;
#endif
ip->i_flag |= IN_CHANGE;
if (vap->va_flags & (IMMUTABLE | APPEND))
return (0);
}
if (ip->i_e2fs_flags & (EXT2_APPEND | EXT2_IMMUTABLE))
return (EPERM);
/*
* Go through the fields and update iff not VNOVAL.
*/
if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
error = ext2fs_chown(vp, vap->va_uid, vap->va_gid, cred, l);
if (error)
return (error);
}
if (vap->va_size != VNOVAL) {
/*
* Disallow write attempts on read-only file systems;
* unless the file is a socket, fifo, or a block or
* character device resident on the file system.
*/
switch (vp->v_type) {
case VDIR:
return (EISDIR);
case VLNK:
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
default:
break;
}
error = ext2fs_truncate(vp, vap->va_size, 0, cred);
if (error)
return (error);
}
ip = VTOI(vp);
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, vp,
NULL, genfs_can_chtimes(vp, vap->va_vaflags, ip->i_uid,
cred));
if (error)
return (error);
if (vap->va_atime.tv_sec != VNOVAL)
if (!(vp->v_mount->mnt_flag & MNT_NOATIME))
ip->i_flag |= IN_ACCESS;
if (vap->va_mtime.tv_sec != VNOVAL) {
ip->i_flag |= IN_CHANGE | IN_UPDATE;
if (vp->v_mount->mnt_flag & MNT_RELATIME)
ip->i_flag |= IN_ACCESS;
}
error = ext2fs_update(vp, &vap->va_atime, &vap->va_mtime,
UPDATE_WAIT);
if (error)
return (error);
}
error = 0;
if (vap->va_mode != (mode_t)VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
error = ext2fs_chmod(vp, (int)vap->va_mode, cred, l);
}
VN_KNOTE(vp, NOTE_ATTRIB);
return (error);
}
/*
* Vnode op for writing.
*/
int
ext2fs_write(void *v)
{
struct vop_write_args *ap = v;
struct vnode *vp;
struct uio *uio;
struct inode *ip;
struct m_ext2fs *fs;
struct buf *bp;
int32_t lbn;
off_t osize;
int blkoffset, error, flags, ioflag, size, xfersize;
ssize_t resid, overrun;
ioflag = ap->a_ioflag;
uio = ap->a_uio;
vp = ap->a_vp;
ip = VTOI(vp);
#ifdef DIAGNOSTIC
if (uio->uio_rw != UIO_WRITE)
panic("%s: mode", "ext2fs_write");
#endif
/*
* If writing 0 bytes, succeed and do not change
* update time or file offset (standards compliance)
*/
if (uio->uio_resid == 0)
return (0);
switch (vp->v_type) {
case VREG:
if (ioflag & IO_APPEND)
uio->uio_offset = ext2fs_size(ip);
if ((ip->i_e2fs_flags & EXT2_APPEND) &&
uio->uio_offset != ext2fs_size(ip))
return (EPERM);
/* FALLTHROUGH */
case VLNK:
break;
case VDIR:
if ((ioflag & IO_SYNC) == 0)
panic("%s: nonsync dir write", "ext2fs_write");
break;
default:
panic("%s: type", "ext2fs_write");
}
fs = ip->i_e2fs;
if (uio->uio_offset < 0 ||
(u_int64_t)uio->uio_offset + uio->uio_resid >
((u_int64_t)0x80000000 * fs->e2fs_bsize - 1))
return (EFBIG);
/* do the filesize rlimit check */
if ((error = vn_fsizechk(vp, uio, ioflag, &overrun)))
return (error);
resid = uio->uio_resid;
osize = ext2fs_size(ip);
flags = ioflag & IO_SYNC ? B_SYNC : 0;
for (error = 0; uio->uio_resid > 0;) {
lbn = lblkno(fs, uio->uio_offset);
blkoffset = blkoff(fs, uio->uio_offset);
xfersize = fs->e2fs_bsize - blkoffset;
if (uio->uio_resid < xfersize)
xfersize = uio->uio_resid;
if (fs->e2fs_bsize > xfersize)
flags |= B_CLRBUF;
else
flags &= ~B_CLRBUF;
error = ext2fs_buf_alloc(ip,
lbn, blkoffset + xfersize, ap->a_cred, &bp, flags);
if (error)
break;
if (uio->uio_offset + xfersize > ext2fs_size(ip)) {
error = ext2fs_setsize(ip, uio->uio_offset + xfersize);
if (error)
break;
uvm_vnp_setsize(vp, ip->i_e2fs_size);
}
uvm_vnp_uncache(vp);
size = fs->e2fs_bsize - bp->b_resid;
if (size < xfersize)
xfersize = size;
error =
uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
if (ioflag & IO_SYNC)
(void)bwrite(bp);
else if (xfersize + blkoffset == fs->e2fs_bsize) {
if (doclusterwrite)
cluster_write(bp, &ip->i_ci, ext2fs_size(ip));
else
bawrite(bp);
} else
bdwrite(bp);
if (error || xfersize == 0)
break;
ip->i_flag |= IN_CHANGE | IN_UPDATE;
}
/*
* If we successfully wrote any data, and we are not the superuser
* we clear the setuid and setgid bits as a precaution against
* tampering.
*/
if (resid > uio->uio_resid && ap->a_cred && ap->a_cred->cr_uid != 0)
ip->i_e2fs_mode &= ~(ISUID | ISGID);
if (error) {
if (ioflag & IO_UNIT) {
(void)ext2fs_truncate(ip, osize,
ioflag & IO_SYNC, ap->a_cred);
uio->uio_offset -= resid - uio->uio_resid;
uio->uio_resid = resid;
}
} else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) {
error = ext2fs_update(ip, NULL, NULL, 1);
}
/* correct the result for writes clamped by vn_fsizechk() */
uio->uio_resid += overrun;
return (error);
}
/*
* Mkdir system call
*/
int
ext2fs_mkdir(void *v)
{
struct vop_mkdir_args *ap = v;
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct componentname *cnp = ap->a_cnp;
struct inode *ip, *dp;
struct vnode *tvp;
struct ext2fs_dirtemplate dirtemplate;
mode_t dmode;
int error;
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ext2fs_mkdir: no name");
#endif
dp = VTOI(dvp);
if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) {
error = EMLINK;
goto out;
}
dmode = vap->va_mode & ACCESSPERMS;
dmode |= IFDIR;
/*
* Must simulate part of ext2fs_makeinode here to acquire the inode,
* but not have it entered in the parent directory. The entry is
* made later after writing "." and ".." entries.
*/
if ((error = ext2fs_inode_alloc(dp, dmode, cnp->cn_cred, &tvp)) != 0)
goto out;
ip = VTOI(tvp);
ip->i_e2fs_uid = cnp->cn_cred->cr_uid;
ip->i_e2fs_gid = dp->i_e2fs_gid;
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_e2fs_mode = dmode;
tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
ip->i_e2fs_nlink = 2;
error = ext2fs_update(ip, NULL, NULL, 1);
/*
* Bump link count in parent directory
* to reflect work done below. Should
* be done before reference is created
* so reparation is possible if we crash.
*/
dp->i_e2fs_nlink++;
dp->i_flag |= IN_CHANGE;
if ((error = ext2fs_update(dp, NULL, NULL, 1)) != 0)
goto bad;
/* Initialize directory with "." and ".." from static template. */
bzero(&dirtemplate, sizeof(dirtemplate));
dirtemplate.dot_ino = h2fs32(ip->i_number);
dirtemplate.dot_reclen = h2fs16(12);
dirtemplate.dot_namlen = 1;
if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 &&
(ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) {
dirtemplate.dot_type = EXT2_FT_DIR;
}
dirtemplate.dot_name[0] = '.';
dirtemplate.dotdot_ino = h2fs32(dp->i_number);
dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12);
dirtemplate.dotdot_namlen = 2;
if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 &&
(ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) {
dirtemplate.dotdot_type = EXT2_FT_DIR;
}
dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.';
error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE,
IO_NODELOCKED|IO_SYNC, cnp->cn_cred, NULL, curproc);
if (error) {
dp->i_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
goto bad;
}
if (VTOI(dvp)->i_e2fs->e2fs_bsize >
VFSTOUFS(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */
else {
error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize);
if (error) {
dp->i_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
goto bad;
}
ip->i_flag |= IN_CHANGE;
}
/* Directory set up, now install its entry in the parent directory. */
error = ext2fs_direnter(ip, dvp, cnp);
if (error != 0) {
dp->i_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
}
bad:
/*
* No need to do an explicit VOP_TRUNCATE here, vrele will do this
* for us because we set the link count to 0.
*/
if (error) {
ip->i_e2fs_nlink = 0;
ip->i_flag |= IN_CHANGE;
vput(tvp);
} else
*ap->a_vpp = tvp;
out:
pool_put(&namei_pool, cnp->cn_pnbuf);
vput(dvp);
return (error);
}
/*
* Rename system call.
* rename("foo", "bar");
* is essentially
* unlink("bar");
* link("foo", "bar");
* unlink("foo");
* but ``atomically''. Can't do full commit without saving state in the
* inode on disk which isn't feasible at this time. Best we can do is
* always guarantee the target exists.
*
* Basic algorithm is:
*
* 1) Bump link count on source while we're linking it to the
* target. This also ensure the inode won't be deleted out
* from underneath us while we work (it may be truncated by
* a concurrent `trunc' or `open' for creation).
* 2) Link source to destination. If destination already exists,
* delete it first.
* 3) Unlink source reference to inode if still around. If a
* directory was moved and the parent of the destination
* is different from the source, patch the ".." entry in the
* directory.
*/
int
ext2fs_rename(void *v)
{
struct vop_rename_args *ap = v;
struct vnode *tvp = ap->a_tvp;
struct vnode *tdvp = ap->a_tdvp;
struct vnode *fvp = ap->a_fvp;
struct vnode *fdvp = ap->a_fdvp;
struct componentname *tcnp = ap->a_tcnp;
struct componentname *fcnp = ap->a_fcnp;
struct inode *ip, *xp, *dp;
struct proc *p = fcnp->cn_proc;
struct ext2fs_dirtemplate dirbuf;
/* struct timespec ts; */
int doingdirectory = 0, oldparent = 0, newparent = 0;
int error = 0;
u_char namlen;
#ifdef DIAGNOSTIC
if ((tcnp->cn_flags & HASBUF) == 0 ||
(fcnp->cn_flags & HASBUF) == 0)
panic("ext2fs_rename: no name");
#endif
/*
* Check for cross-device rename.
*/
if ((fvp->v_mount != tdvp->v_mount) ||
(tvp && (fvp->v_mount != tvp->v_mount))) {
error = EXDEV;
abortit:
VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */
vrele(fdvp);
vrele(fvp);
return (error);
}
/*
* Check if just deleting a link name.
*/
if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) ||
(VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) {
error = EPERM;
goto abortit;
}
if (fvp == tvp) {
if (fvp->v_type == VDIR) {
error = EINVAL;
goto abortit;
}
/* Release destination completely. */
VOP_ABORTOP(tdvp, tcnp);
vput(tdvp);
vput(tvp);
/* Delete source. */
vrele(fdvp);
vrele(fvp);
fcnp->cn_flags &= ~MODMASK;
fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
if ((fcnp->cn_flags & SAVESTART) == 0)
panic("ext2fs_rename: lost from startdir");
fcnp->cn_nameiop = DELETE;
(void) vfs_relookup(fdvp, &fvp, fcnp);
return (VOP_REMOVE(fdvp, fvp, fcnp));
}
if ((error = vn_lock(fvp, LK_EXCLUSIVE, p)) != 0)
goto abortit;
dp = VTOI(fdvp);
ip = VTOI(fvp);
if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) {
VOP_UNLOCK(fvp, 0);
error = EMLINK;
goto abortit;
}
if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) ||
(dp->i_e2fs_flags & EXT2_APPEND)) {
VOP_UNLOCK(fvp, 0);
error = EPERM;
goto abortit;
}
if ((ip->i_e2fs_mode & IFMT) == IFDIR) {
error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred);
if (!error && tvp)
error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred);
if (error) {
VOP_UNLOCK(fvp, 0);
error = EACCES;
goto abortit;
}
/*
* Avoid ".", "..", and aliases of "." for obvious reasons.
*/
if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
dp == ip ||
(fcnp->cn_flags&ISDOTDOT) ||
(tcnp->cn_flags & ISDOTDOT) ||
(ip->i_flag & IN_RENAME)) {
VOP_UNLOCK(fvp, 0);
error = EINVAL;
goto abortit;
}
ip->i_flag |= IN_RENAME;
oldparent = dp->i_number;
doingdirectory++;
}
vrele(fdvp);
/*
* When the target exists, both the directory
* and target vnodes are returned locked.
*/
dp = VTOI(tdvp);
xp = NULL;
if (tvp)
xp = VTOI(tvp);
/*
* 1) Bump link count while we're moving stuff
* around. If we crash somewhere before
* completing our work, the link count
* may be wrong, but correctable.
*/
ip->i_e2fs_nlink++;
ip->i_flag |= IN_CHANGE;
if ((error = ext2fs_update(ip, NULL, NULL, 1)) != 0) {
VOP_UNLOCK(fvp, 0);
goto bad;
}
/*
* If ".." must be changed (ie the directory gets a new
* parent) then the source directory must not be in the
* directory hierarchy above the target, as this would
* orphan everything below the source directory. Also
* the user must have write permission in the source so
* as to be able to change "..". We must repeat the call
* to namei, as the parent directory is unlocked by the
* call to checkpath().
*/
error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred);
VOP_UNLOCK(fvp, 0);
if (oldparent != dp->i_number)
newparent = dp->i_number;
if (doingdirectory && newparent) {
if (error) /* write access check above */
goto bad;
if (xp != NULL)
vput(tvp);
error = ext2fs_checkpath(ip, dp, tcnp->cn_cred);
if (error != 0)
goto out;
if ((tcnp->cn_flags & SAVESTART) == 0)
panic("ext2fs_rename: lost to startdir");
if ((error = vfs_relookup(tdvp, &tvp, tcnp)) != 0)
goto out;
dp = VTOI(tdvp);
xp = NULL;
if (tvp)
xp = VTOI(tvp);
}
/*
* 2) If target doesn't exist, link the target
* to the source and unlink the source.
* Otherwise, rewrite the target directory
* entry to reference the source inode and
* expunge the original entry's existence.
*/
if (xp == NULL) {
if (dp->i_dev != ip->i_dev)
panic("rename: EXDEV");
/*
* Account for ".." in new directory.
* When source and destination have the same
* parent we don't fool with the link count.
*/
if (doingdirectory && newparent) {
if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) {
error = EMLINK;
goto bad;
}
dp->i_e2fs_nlink++;
dp->i_flag |= IN_CHANGE;
if ((error = ext2fs_update(dp, NULL, NULL, 1)) != 0)
goto bad;
}
error = ext2fs_direnter(ip, tdvp, tcnp);
if (error != 0) {
if (doingdirectory && newparent) {
dp->i_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
(void)ext2fs_update(dp, NULL, NULL, 1);
}
goto bad;
}
vput(tdvp);
} else {
if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
panic("rename: EXDEV");
/*
* Short circuit rename(foo, foo).
*/
if (xp->i_number == ip->i_number)
panic("rename: same file");
/*
* If the parent directory is "sticky", then the user must
* own the parent directory, or the destination of the rename,
* otherwise the destination may not be changed (except by
* root). This implements append-only directories.
*/
if ((dp->i_e2fs_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
tcnp->cn_cred->cr_uid != dp->i_e2fs_uid &&
xp->i_e2fs_uid != tcnp->cn_cred->cr_uid) {
error = EPERM;
goto bad;
}
/*
* Target must be empty if a directory and have no links
* to it. Also, ensure source and target are compatible
* (both directories, or both not directories).
*/
if ((xp->i_e2fs_mode & IFMT) == IFDIR) {
if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) ||
xp->i_e2fs_nlink > 2) {
error = ENOTEMPTY;
goto bad;
}
if (!doingdirectory) {
error = ENOTDIR;
goto bad;
}
cache_purge(tdvp);
} else if (doingdirectory) {
error = EISDIR;
goto bad;
}
error = ext2fs_dirrewrite(dp, ip, tcnp);
if (error != 0)
goto bad;
/*
* If the target directory is in the same
* directory as the source directory,
* decrement the link count on the parent
* of the target directory.
*/
if (doingdirectory && !newparent) {
dp->i_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
}
vput(tdvp);
/*
* Adjust the link count of the target to
* reflect the dirrewrite above. If this is
* a directory it is empty and there are
* no links to it, so we can squash the inode and
* any space associated with it. We disallowed
* renaming over top of a directory with links to
* it above, as the remaining link would point to
* a directory without "." or ".." entries.
*/
xp->i_e2fs_nlink--;
if (doingdirectory) {
if (--xp->i_e2fs_nlink != 0)
panic("rename: linked directory");
error = ext2fs_truncate(xp, (off_t)0, IO_SYNC,
tcnp->cn_cred);
}
xp->i_flag |= IN_CHANGE;
vput(tvp);
xp = NULL;
}
/*
* 3) Unlink the source.
*/
fcnp->cn_flags &= ~MODMASK;
fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
if ((fcnp->cn_flags & SAVESTART) == 0)
panic("ext2fs_rename: lost from startdir");
(void) vfs_relookup(fdvp, &fvp, fcnp);
if (fvp != NULL) {
xp = VTOI(fvp);
dp = VTOI(fdvp);
} else {
/*
* From name has disappeared.
*/
if (doingdirectory)
panic("ext2fs_rename: lost dir entry");
vrele(ap->a_fvp);
return (0);
}
/*
* Ensure that the directory entry still exists and has not
* changed while the new name has been entered. If the source is
* a file then the entry may have been unlinked or renamed. In
* either case there is no further work to be done. If the source
* is a directory then it cannot have been rmdir'ed; its link
* count of three would cause a rmdir to fail with ENOTEMPTY.
* The IRENAME flag ensures that it cannot be moved by another
* rename.
*/
if (xp != ip) {
if (doingdirectory)
panic("ext2fs_rename: lost dir entry");
} else {
/*
* If the source is a directory with a
* new parent, the link count of the old
* parent directory must be decremented
* and ".." set to point to the new parent.
*/
if (doingdirectory && newparent) {
dp->i_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf,
sizeof (struct ext2fs_dirtemplate), (off_t)0,
UIO_SYSSPACE, IO_NODELOCKED,
tcnp->cn_cred, NULL, curproc);
if (error == 0) {
namlen = dirbuf.dotdot_namlen;
if (namlen != 2 ||
dirbuf.dotdot_name[0] != '.' ||
dirbuf.dotdot_name[1] != '.') {
ufs_dirbad(xp, (doff_t)12,
"ext2fs_rename: mangled dir");
} else {
dirbuf.dotdot_ino = h2fs32(newparent);
(void) vn_rdwr(UIO_WRITE, fvp,
(caddr_t)&dirbuf,
sizeof (struct dirtemplate),
(off_t)0, UIO_SYSSPACE,
IO_NODELOCKED|IO_SYNC,
tcnp->cn_cred, NULL, curproc);
cache_purge(fdvp);
}
}
}
error = ext2fs_dirremove(fdvp, fcnp);
if (!error) {
xp->i_e2fs_nlink--;
xp->i_flag |= IN_CHANGE;
}
xp->i_flag &= ~IN_RENAME;
}
if (dp)
vput(fdvp);
if (xp)
vput(fvp);
vrele(ap->a_fvp);
return (error);
bad:
if (xp)
vput(ITOV(xp));
vput(ITOV(dp));
out:
if (doingdirectory)
ip->i_flag &= ~IN_RENAME;
if (vn_lock(fvp, LK_EXCLUSIVE, p) == 0) {
ip->i_e2fs_nlink--;
ip->i_flag |= IN_CHANGE;
vput(fvp);
} else
vrele(fvp);
return (error);
}
/*
* Set attribute vnode op. called from several syscalls
*/
int
ext2fs_setattr(void *v)
{
struct vop_setattr_args *ap = v;
struct vattr *vap = ap->a_vap;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct ucred *cred = ap->a_cred;
struct proc *p = curproc;
int error;
/*
* Check for unsettable attributes.
*/
if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
(vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
(vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
return (EINVAL);
}
if (vap->va_flags != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if (cred->cr_uid != ip->i_e2fs_uid &&
(error = suser_ucred(cred)))
return (error);
#ifdef EXT2FS_SYSTEM_FLAGS
if (cred->cr_uid == 0) {
if ((ip->i_e2fs_flags &
(EXT2_APPEND | EXT2_IMMUTABLE)) && securelevel > 0)
return (EPERM);
ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE);
ip->i_e2fs_flags |=
(vap->va_flags & SF_APPEND) ? EXT2_APPEND : 0 |
(vap->va_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE: 0;
} else {
return (EPERM);
}
#else
ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE);
ip->i_e2fs_flags |=
(vap->va_flags & UF_APPEND) ? EXT2_APPEND : 0 |
(vap->va_flags & UF_IMMUTABLE) ? EXT2_IMMUTABLE: 0;
#endif
ip->i_flag |= IN_CHANGE;
if (vap->va_flags & (IMMUTABLE | APPEND))
return (0);
}
if (ip->i_e2fs_flags & (EXT2_APPEND | EXT2_IMMUTABLE))
return (EPERM);
/*
* Go through the fields and update iff not VNOVAL.
*/
if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
error = ext2fs_chown(vp, vap->va_uid, vap->va_gid, cred, p);
if (error)
return (error);
}
if (vap->va_size != VNOVAL) {
/*
* Disallow write attempts on read-only file systems;
* unless the file is a socket, fifo, or a block or
* character device resident on the file system.
*/
switch (vp->v_type) {
case VDIR:
return (EISDIR);
case VLNK:
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
default:
break;
}
error = ext2fs_truncate(ip, vap->va_size, 0, cred);
if (error)
return (error);
}
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if (cred->cr_uid != ip->i_e2fs_uid &&
(error = suser_ucred(cred)) &&
((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
(error = VOP_ACCESS(vp, VWRITE, cred))))
return (error);
if (vap->va_mtime.tv_sec != VNOVAL)
ip->i_flag |= IN_CHANGE | IN_UPDATE;
if (vap->va_atime.tv_sec != VNOVAL) {
if (!(vp->v_mount->mnt_flag & MNT_NOATIME) ||
(ip->i_flag & (IN_CHANGE | IN_UPDATE)))
ip->i_flag |= IN_ACCESS;
}
error = ext2fs_update(ip, &vap->va_atime, &vap->va_mtime, 1);
if (error)
return (error);
}
error = 0;
if (vap->va_mode != (mode_t)VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
error = ext2fs_chmod(vp, (int)vap->va_mode, cred, p);
}
return (error);
}
/*
* Allocate a new inode.
*/
int
ext2fs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
struct componentname *cnp)
{
struct inode *ip, *pdir;
struct vnode *tvp;
int error;
pdir = VTOI(dvp);
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ext2fs_makeinode: no name");
#endif
*vpp = NULL;
if ((mode & IFMT) == 0)
mode |= IFREG;
if ((error = ext2fs_inode_alloc(pdir, mode, cnp->cn_cred, &tvp))
!= 0) {
pool_put(&namei_pool, cnp->cn_pnbuf);
vput(dvp);
return (error);
}
ip = VTOI(tvp);
ip->i_e2fs_gid = pdir->i_e2fs_gid;
ip->i_e2fs_uid = cnp->cn_cred->cr_uid;
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_e2fs_mode = mode;
tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
ip->i_e2fs_nlink = 1;
if ((ip->i_e2fs_mode & ISGID) &&
!groupmember(ip->i_e2fs_gid, cnp->cn_cred) &&
suser_ucred(cnp->cn_cred))
ip->i_e2fs_mode &= ~ISGID;
/*
* Make sure inode goes to disk before directory entry.
*/
if ((error = ext2fs_update(ip, NULL, NULL, 1)) != 0)
goto bad;
error = ext2fs_direnter(ip, dvp, cnp);
if (error != 0)
goto bad;
if ((cnp->cn_flags & SAVESTART) == 0)
pool_put(&namei_pool, cnp->cn_pnbuf);
vput(dvp);
*vpp = tvp;
return (0);
bad:
/*
* Write error occurred trying to update the inode
* or the directory so must deallocate the inode.
*/
pool_put(&namei_pool, cnp->cn_pnbuf);
vput(dvp);
ip->i_e2fs_nlink = 0;
ip->i_flag |= IN_CHANGE;
tvp->v_type = VNON;
vput(tvp);
return (error);
}
/*
* Go through the disk queues to initiate sandbagged IO;
* go through the inodes to write those that have been modified;
* initiate the writing of the super block if it has been modified.
*
* Note: we are always called with the filesystem marked `MPBUSY'.
*/
int
ext2fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
{
struct vnode *vp, *mvp;
struct inode *ip;
struct ufsmount *ump = VFSTOUFS(mp);
struct m_ext2fs *fs;
int error, allerror = 0;
fs = ump->um_e2fs;
if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */
printf("fs = %s\n", fs->e2fs_fsmnt);
panic("update: rofs mod");
}
/* Allocate a marker vnode. */
mvp = vnalloc(mp);
/*
* Write back each (modified) inode.
*/
mutex_enter(&mntvnode_lock);
loop:
/*
* NOTE: not using the TAILQ_FOREACH here since in this loop vgone()
* and vclean() can be called indirectly
*/
for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) {
vmark(mvp, vp);
if (vp->v_mount != mp || vismarker(vp))
continue;
mutex_enter(vp->v_interlock);
ip = VTOI(vp);
if (ip == NULL || (vp->v_iflag & (VI_XLOCK|VI_CLEAN)) != 0 ||
vp->v_type == VNON ||
((ip->i_flag &
(IN_CHANGE | IN_UPDATE | IN_MODIFIED)) == 0 &&
LIST_EMPTY(&vp->v_dirtyblkhd) &&
UVM_OBJ_IS_CLEAN(&vp->v_uobj)))
{
mutex_exit(vp->v_interlock);
continue;
}
mutex_exit(&mntvnode_lock);
error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT);
if (error) {
mutex_enter(&mntvnode_lock);
if (error == ENOENT) {
mutex_enter(&mntvnode_lock);
(void)vunmark(mvp);
goto loop;
}
continue;
}
if (vp->v_type == VREG && waitfor == MNT_LAZY)
error = ext2fs_update(vp, NULL, NULL, 0);
else
error = VOP_FSYNC(vp, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0);
if (error)
allerror = error;
vput(vp);
mutex_enter(&mntvnode_lock);
}
mutex_exit(&mntvnode_lock);
vnfree(mvp);
/*
* Force stale file system control information to be flushed.
*/
if (waitfor != MNT_LAZY) {
vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
if ((error = VOP_FSYNC(ump->um_devvp, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0)
allerror = error;
VOP_UNLOCK(ump->um_devvp);
}
/*
* Write back modified superblock.
*/
if (fs->e2fs_fmod != 0) {
fs->e2fs_fmod = 0;
fs->e2fs.e2fs_wtime = time_second;
if ((error = ext2fs_cgupdate(ump, waitfor)))
allerror = error;
}
return (allerror);
}
/*
* ext2fs_gro_rename: Actually perform the rename operation.
*/
static int
ext2fs_gro_rename(struct mount *mp, kauth_cred_t cred,
struct vnode *fdvp, struct componentname *fcnp,
void *fde, struct vnode *fvp,
struct vnode *tdvp, struct componentname *tcnp,
void *tde, struct vnode *tvp)
{
struct ufs_lookup_results *fulr = fde;
struct ufs_lookup_results *tulr = tde;
bool directory_p, reparent_p;
int error;
(void)mp;
KASSERT(mp != NULL);
KASSERT(fdvp != NULL);
KASSERT(fcnp != NULL);
KASSERT(fulr != NULL);
KASSERT(fvp != NULL);
KASSERT(tdvp != NULL);
KASSERT(tcnp != NULL);
KASSERT(tulr != NULL);
KASSERT(fulr != tulr);
KASSERT(fdvp != fvp);
KASSERT(fdvp != tvp);
KASSERT(tdvp != fvp);
KASSERT(tdvp != tvp);
KASSERT(fvp != tvp);
KASSERT(fdvp->v_mount == mp);
KASSERT(fvp->v_mount == mp);
KASSERT(tdvp->v_mount == mp);
KASSERT((tvp == NULL) || (tvp->v_mount == mp));
KASSERT(VOP_ISLOCKED(fdvp) == LK_EXCLUSIVE);
KASSERT(VOP_ISLOCKED(fvp) == LK_EXCLUSIVE);
KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE);
KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE));
/*
* We shall need to temporarily bump the link count, so make
* sure there is room to do so.
*/
if ((nlink_t)VTOI(fvp)->i_e2fs_nlink >= LINK_MAX)
return EMLINK;
directory_p = (fvp->v_type == VDIR);
KASSERT(directory_p == ((VTOI(fvp)->i_e2fs_mode & IFMT) == IFDIR));
KASSERT((tvp == NULL) || (directory_p == (tvp->v_type == VDIR)));
KASSERT((tvp == NULL) || (directory_p ==
((VTOI(tvp)->i_e2fs_mode & IFMT) == IFDIR)));
reparent_p = (fdvp != tdvp);
KASSERT(reparent_p == (VTOI(fdvp)->i_number != VTOI(tdvp)->i_number));
/*
* Commence hacking of the data on disk.
*/
/*
* 1) Bump link count while we're moving stuff
* around. If we crash somewhere before
* completing our work, the link count
* may be wrong, but correctable.
*/
KASSERT((nlink_t)VTOI(fvp)->i_e2fs_nlink < LINK_MAX);
VTOI(fvp)->i_e2fs_nlink++;
VTOI(fvp)->i_flag |= IN_CHANGE;
error = ext2fs_update(fvp, NULL, NULL, UPDATE_WAIT);
if (error)
goto whymustithurtsomuch;
/*
* 2) If target doesn't exist, link the target
* to the source and unlink the source.
* Otherwise, rewrite the target directory
* entry to reference the source inode and
* expunge the original entry's existence.
*/
if (tvp == NULL) {
/*
* Account for ".." in new directory.
* When source and destination have the same
* parent we don't fool with the link count.
*/
if (directory_p && reparent_p) {
if ((nlink_t)VTOI(tdvp)->i_e2fs_nlink >= LINK_MAX) {
error = EMLINK;
goto whymustithurtsomuch;
}
KASSERT((nlink_t)VTOI(tdvp)->i_e2fs_nlink < LINK_MAX);
VTOI(tdvp)->i_e2fs_nlink++;
VTOI(tdvp)->i_flag |= IN_CHANGE;
error = ext2fs_update(tdvp, NULL, NULL, UPDATE_WAIT);
if (error) {
/*
* Link count update didn't take --
* back out the in-memory link count.
*/
KASSERT(0 < VTOI(tdvp)->i_e2fs_nlink);
VTOI(tdvp)->i_e2fs_nlink--;
VTOI(tdvp)->i_flag |= IN_CHANGE;
goto whymustithurtsomuch;
}
}
error = ext2fs_direnter(VTOI(fvp), tdvp, tulr, tcnp);
if (error) {
if (directory_p && reparent_p) {
/*
* Directory update didn't take, but
* the link count update did -- back
* out the in-memory link count and the
* on-disk link count.
*/
KASSERT(0 < VTOI(tdvp)->i_e2fs_nlink);
VTOI(tdvp)->i_e2fs_nlink--;
VTOI(tdvp)->i_flag |= IN_CHANGE;
(void)ext2fs_update(tdvp, NULL, NULL,
UPDATE_WAIT);
}
goto whymustithurtsomuch;
}
} else {
if (directory_p)
/* XXX WTF? Why purge here? Why not purge others? */
cache_purge(tdvp);
/*
* Make the target directory's entry for tcnp point at
* the source node.
*/
error = ext2fs_dirrewrite(VTOI(tdvp), tulr, VTOI(fvp), tcnp);
if (error)
goto whymustithurtsomuch;
/*
* If the source and target are directories, and the
* target is in the same directory as the source,
* decrement the link count of the common parent
* directory, since we are removing the target from
* that directory.
*/
if (directory_p && !reparent_p) {
KASSERT(fdvp == tdvp);
/* XXX check, don't kassert */
KASSERT(0 < VTOI(tdvp)->i_e2fs_nlink);
VTOI(tdvp)->i_e2fs_nlink--;
VTOI(tdvp)->i_flag |= IN_CHANGE;
}
/*
* Adjust the link count of the target to
* reflect the dirrewrite above. If this is
* a directory it is empty and there are
* no links to it, so we can squash the inode and
* any space associated with it. We disallowed
* renaming over top of a directory with links to
* it above, as the remaining link would point to
* a directory without "." or ".." entries.
*/
/* XXX check, don't kassert */
KASSERT(0 < VTOI(tvp)->i_e2fs_nlink);
VTOI(tvp)->i_e2fs_nlink--;
if (directory_p) {
/*
* XXX The ext2fs_dirempty call earlier does
* not guarantee anything about nlink.
*/
if (VTOI(tvp)->i_e2fs_nlink != 1)
ufs_dirbad(VTOI(tvp), (doff_t)0,
"hard-linked directory");
VTOI(tvp)->i_e2fs_nlink = 0;
error = ext2fs_truncate(tvp, (off_t)0, IO_SYNC, cred);
#if 0 /* XXX This branch was not in ext2fs_rename! */
if (error)
goto whymustithurtsomuch;
#endif
}
/*
* XXX Why is this here, and not above the preceding
* conditional?
*/
VTOI(tvp)->i_flag |= IN_CHANGE;
}
/*
* If the source is a directory with a new parent, the link
* count of the old parent directory must be decremented and
* ".." set to point to the new parent.
*/
if (directory_p && reparent_p) {
error = ext2fs_rename_replace_dotdot(fvp, fdvp, tdvp, cred);
if (error)
goto whymustithurtsomuch;
/* XXX WTF? Why purge here? Why not purge others? */
cache_purge(fdvp);
}
/*
* 3) Unlink the source.
*/
/*
* ext2fs_direnter may compact the directory in the process of
* inserting a new entry. That may invalidate fulr, which we
* need in order to remove the old entry. In that case, we
* need to recalculate what fulr should be.
*/
if (!reparent_p && (tvp == NULL) &&
ext2fs_rename_ulr_overlap_p(fulr, tulr)) {
error = ext2fs_rename_recalculate_fulr(fdvp, fulr, tulr, fcnp);
#if 0 /* XXX */
if (error) /* XXX Try to back out changes? */
goto whymustithurtsomuch;
#endif
}
error = ext2fs_dirremove(fdvp, fulr, fcnp);
if (error)
goto whymustithurtsomuch;
/*
* XXX Perhaps this should go at the top, in case the file
* system is modified but incompletely so because of an
* intermediate error.
*/
genfs_rename_knote(fdvp, fvp, tdvp, tvp,
((tvp != NULL) && (VTOI(tvp)->i_e2fs_nlink == 0)));
#if 0 /* XXX */
genfs_rename_cache_purge(fdvp, fvp, tdvp, tvp);
#endif
whymustithurtsomuch:
KASSERT(0 < VTOI(fvp)->i_e2fs_nlink);
VTOI(fvp)->i_e2fs_nlink--;
VTOI(fvp)->i_flag |= IN_CHANGE;
return error;
}
/*
* Truncate the inode oip to at most length size, freeing the
* disk blocks.
*/
int
ext2fs_truncate(struct inode *oip, off_t length, int flags, struct ucred *cred)
{
struct vnode *ovp = ITOV(oip);
int32_t lastblock;
int32_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR];
int32_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR];
struct m_ext2fs *fs;
struct buf *bp;
int offset, size, level;
long count, nblocks, vflags, blocksreleased = 0;
int i;
int aflags, error, allerror;
off_t osize;
if (length < 0)
return (EINVAL);
if (ovp->v_type != VREG &&
ovp->v_type != VDIR &&
ovp->v_type != VLNK)
return (0);
if (ovp->v_type == VLNK && ext2fs_size(oip) < EXT2_MAXSYMLINKLEN) {
#ifdef DIAGNOSTIC
if (length != 0)
panic("ext2fs_truncate: partial truncate of symlink");
#endif
memset(&oip->i_e2din->e2di_shortlink, 0, ext2fs_size(oip));
(void)ext2fs_setsize(oip, 0);
oip->i_flag |= IN_CHANGE | IN_UPDATE;
return (ext2fs_update(oip, 1));
}
if (ext2fs_size(oip) == length) {
oip->i_flag |= IN_CHANGE | IN_UPDATE;
return (ext2fs_update(oip, 0));
}
fs = oip->i_e2fs;
osize = ext2fs_size(oip);
/*
* Lengthen the size of the file. We must ensure that the
* last byte of the file is allocated. Since the smallest
* value of osize is 0, length will be at least 1.
*/
if (osize < length) {
#if 0 /* XXX */
if (length > fs->fs_maxfilesize)
return (EFBIG);
#endif
offset = blkoff(fs, length - 1);
lbn = lblkno(fs, length - 1);
aflags = B_CLRBUF;
if (flags & IO_SYNC)
aflags |= B_SYNC;
error = ext2fs_buf_alloc(oip, lbn, offset + 1, cred, &bp,
aflags);
if (error)
return (error);
(void)ext2fs_setsize(oip, length);
uvm_vnp_setsize(ovp, length);
uvm_vnp_uncache(ovp);
if (aflags & B_SYNC)
bwrite(bp);
else
bawrite(bp);
oip->i_flag |= IN_CHANGE | IN_UPDATE;
return (ext2fs_update(oip, 1));
}
/*
* Shorten the size of the file. If the file is not being
* truncated to a block boundry, the contents of the
* partial block following the end of the file must be
* zero'ed in case it ever become accessible again because
* of subsequent file growth.
*/
offset = blkoff(fs, length);
if (offset == 0) {
(void)ext2fs_setsize(oip, length);
} else {
lbn = lblkno(fs, length);
aflags = B_CLRBUF;
if (flags & IO_SYNC)
aflags |= B_SYNC;
error = ext2fs_buf_alloc(oip, lbn, offset, cred, &bp,
aflags);
if (error)
return (error);
(void)ext2fs_setsize(oip, length);
size = fs->e2fs_bsize;
uvm_vnp_setsize(ovp, length);
uvm_vnp_uncache(ovp);
memset(bp->b_data + offset, 0, size - offset);
bp->b_bcount = size;
if (aflags & B_SYNC)
bwrite(bp);
else
bawrite(bp);
}
/*
* Calculate index into inode's block list of
* last direct and indirect blocks (if any)
* which we want to keep. Lastblock is -1 when
* the file is truncated to 0.
*/
lastblock = lblkno(fs, length + fs->e2fs_bsize - 1) - 1;
lastiblock[SINGLE] = lastblock - NDADDR;
lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
nblocks = btodb(fs->e2fs_bsize);
/*
* Update file and block pointers on disk before we start freeing
* blocks. If we crash before free'ing blocks below, the blocks
* will be returned to the free list. lastiblock values are also
* normalized to -1 for calls to ext2fs_indirtrunc below.
*/
memcpy(oldblks, &oip->i_e2fs_blocks[0], sizeof(oldblks));
for (level = TRIPLE; level >= SINGLE; level--)
if (lastiblock[level] < 0) {
oip->i_e2fs_blocks[NDADDR + level] = 0;
lastiblock[level] = -1;
}
for (i = NDADDR - 1; i > lastblock; i--)
oip->i_e2fs_blocks[i] = 0;
oip->i_flag |= IN_CHANGE | IN_UPDATE;
if ((error = ext2fs_update(oip, 1)) != 0)
allerror = error;
/*
* Having written the new inode to disk, save its new configuration
* and put back the old block pointers long enough to process them.
* Note that we save the new block configuration so we can check it
* when we are done.
*/
memcpy(newblks, &oip->i_e2fs_blocks[0], sizeof(newblks));
memcpy(&oip->i_e2fs_blocks[0], oldblks, sizeof(oldblks));
(void)ext2fs_setsize(oip, osize);
vflags = ((length > 0) ? V_SAVE : 0) | V_SAVEMETA;
allerror = vinvalbuf(ovp, vflags, cred, curproc, 0, 0);
/*
* Indirect blocks first.
*/
indir_lbn[SINGLE] = -NDADDR;
indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) -1;
indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
for (level = TRIPLE; level >= SINGLE; level--) {
bn = letoh32(oip->i_e2fs_blocks[NDADDR + level]);
if (bn != 0) {
error = ext2fs_indirtrunc(oip, indir_lbn[level],
fsbtodb(fs, bn), lastiblock[level], level, &count);
if (error)
allerror = error;
blocksreleased += count;
if (lastiblock[level] < 0) {
oip->i_e2fs_blocks[NDADDR + level] = 0;
ext2fs_blkfree(oip, bn);
blocksreleased += nblocks;
}
}
if (lastiblock[level] >= 0)
goto done;
}
/*
* All whole direct blocks or frags.
*/
for (i = NDADDR - 1; i > lastblock; i--) {
bn = letoh32(oip->i_e2fs_blocks[i]);
if (bn == 0)
continue;
oip->i_e2fs_blocks[i] = 0;
ext2fs_blkfree(oip, bn);
blocksreleased += btodb(fs->e2fs_bsize);
}
done:
#ifdef DIAGNOSTIC
for (level = SINGLE; level <= TRIPLE; level++)
if (newblks[NDADDR + level] !=
oip->i_e2fs_blocks[NDADDR + level])
panic("ext2fs_truncate1");
for (i = 0; i < NDADDR; i++)
if (newblks[i] != oip->i_e2fs_blocks[i])
panic("ext2fs_truncate2");
if (length == 0 &&
(!LIST_EMPTY(&ovp->v_cleanblkhd) ||
!LIST_EMPTY(&ovp->v_dirtyblkhd)))
panic("ext2fs_truncate3");
#endif /* DIAGNOSTIC */
/*
* Put back the real size.
*/
(void)ext2fs_setsize(oip, length);
if (blocksreleased >= oip->i_e2fs_nblock)
oip->i_e2fs_nblock = 0;
else
oip->i_e2fs_nblock -= blocksreleased;
oip->i_flag |= IN_CHANGE;
return (allerror);
}
