/*
* gfs_readdir_pred: readdir loop predicate
* voffp - a pointer in which the next virtual offset should be stored
*
* Returns a 0 on success, a non-zero errno on failure, or -1 if the
* readdir loop should terminate. A non-zero result (either errno or
* -1) from this function is typically passed directly to
* gfs_readdir_fini().
*/
int
gfs_readdir_pred(gfs_readdir_state_t *st, uio_t *uiop, offset_t *voffp,
int *ncookies, u_long **cookies)
{
offset_t off, voff;
int error;
top:
if (uio_resid(uiop) <= 0)
return (-1);
off = uio_offset(uiop) / st->grd_ureclen;
voff = off - 2;
if (off == 0) {
if ((error = gfs_readdir_emit(st, uiop, voff, st->grd_self,
".", 0, ncookies, cookies)) == 0)
goto top;
} else if (off == 1) {
dprintf("Sending out .. with id %d\n", st->grd_parent);
if ((error = gfs_readdir_emit(st, uiop, voff, st->grd_parent,
"..", 0, ncookies, cookies)) == 0)
goto top;
} else {
*voffp = voff;
return (0);
}
return (error);
}
/*
* gfs_readdir_pred: readdir loop predicate
* voffp - a pointer in which the next virtual offset should be stored
*
* Returns a 0 on success, a non-zero errno on failure, or -1 if the
* readdir loop should terminate. A non-zero result (either errno or
* -1) from this function is typically passed directly to
* gfs_readdir_fini().
*/
int
gfs_readdir_pred(gfs_readdir_state_t *st, uio_t *uiop, offset_t *voffp)
{
offset_t off, voff;
int error;
top:
if (uiop->uio_resid <= 0)
return (-1);
off = uiop->uio_loffset / st->grd_ureclen;
voff = off - 2;
if (off == 0) {
if ((error = gfs_readdir_emit(st, uiop, voff, st->grd_self,
".", 0)) == 0)
goto top;
} else if (off == 1) {
if ((error = gfs_readdir_emit(st, uiop, voff, st->grd_parent,
"..", 0)) == 0)
goto top;
} else {
*voffp = voff;
return (0);
}
return (error);
}
/*
* gfs_readdir_emitn: like gfs_readdir_emit(), but takes an integer
* instead of a string for the entry's name.
*/
int
gfs_readdir_emitn(gfs_readdir_state_t *st, uio_t *uiop, offset_t voff,
ino64_t ino, unsigned long num)
{
char buf[40];
numtos(num, buf);
return (gfs_readdir_emit(st, uiop, voff, ino, buf, 0));
}
/*
* gfs_dir_readdir: does a readdir() on the given directory
*
* dvp - directory vnode
* uiop - uio structure
* eofp - eof pointer
* data - arbitrary data passed to readdir callback
*
* This routine does all the readdir() dirty work. Even so, the caller must
* supply two callbacks in order to get full compatibility.
*
* If the directory contains static entries, an inode callback must be
* specified. This avoids having to create every vnode and call VOP_GETATTR()
* when reading the directory. This function has the following arguments:
*
* ino_t gfs_inode_cb(struct vnode *vp, int index);
*
* vp - vnode for the directory
* index - index in original gfs_dirent_t array
*
* Returns the inode number for the given entry.
*
* For directories with dynamic entries, a readdir callback must be provided.
* This is significantly more complex, thanks to the particulars of
* VOP_READDIR().
*
* int gfs_readdir_cb(struct vnode *vp, void *dp, int *eofp,
* offset_t *off, offset_t *nextoff, void *data, int flags)
*
* vp - directory vnode
* dp - directory entry, sized according to maxlen given to
* gfs_dir_create(). callback must fill in d_name and
* d_ino (if a dirent64_t), or ed_name, ed_ino, and ed_eflags
* (if an edirent_t). edirent_t is used if V_RDDIR_ENTFLAGS
* is set in 'flags'.
* eofp - callback must set to 1 when EOF has been reached
* off - on entry, the last offset read from the directory. Callback
* must set to the offset of the current entry, typically left
* untouched.
* nextoff - callback must set to offset of next entry. Typically
* (off + 1)
* data - caller-supplied data
* flags - VOP_READDIR flags
*
* Return 0 on success, or error on failure.
*/
int
gfs_dir_readdir(struct vnode *dvp, uio_t *uiop, int *eofp, int *ncookies,
u_long **cookies, void *data, cred_t *cr, int flags)
{
gfs_readdir_state_t gstate;
int error, eof = 0;
ino64_t ino, pino;
offset_t off, next;
gfs_dir_t *dp = vnode_fsnode(dvp);
error = gfs_get_parent_ino(dvp, cr, NULL, &pino, &ino);
if (error)
return (error);
if ((error = gfs_readdir_init(&gstate, dp->gfsd_maxlen, 1, uiop,
pino, ino, flags)) != 0)
return (error);
while ((error = gfs_readdir_pred(&gstate, uiop, &off, ncookies,
cookies)) == 0 && !eof) {
if (off >= 0 && off < dp->gfsd_nstatic) {
ino = dp->gfsd_inode(dvp, off);
if ((error = gfs_readdir_emit(&gstate, uiop,
off, ino, dp->gfsd_static[off].gfse_name, 0,
ncookies, cookies)) != 0)
break;
} else if (dp->gfsd_readdir) {
off -= dp->gfsd_nstatic;
if ((error = dp->gfsd_readdir(dvp,
gstate.grd_dirent, &eof, &off, &next,
data, flags)) != 0 || eof)
break;
off += dp->gfsd_nstatic + 2;
next += dp->gfsd_nstatic + 2;
if ((error = gfs_readdir_emit_int(&gstate, uiop,
next, ncookies, cookies)) != 0)
break;
} else {
/*
* Offset is beyond the end of the static entries, and
* we have no dynamic entries. Set EOF.
*/
eof = 1;
}
}
return (gfs_readdir_fini(&gstate, error, eofp, eof));
}
static int
xattr_dir_readdir(vnode_t *dvp, uio_t *uiop, cred_t *cr, int *eofp,
caller_context_t *ct, int flags)
{
vnode_t *pvp;
int error;
int local_eof;
int reset_off = 0;
int has_xattrs = 0;
if (eofp == NULL) {
eofp = &local_eof;
}
*eofp = 0;
/*
* See if there is a real extended attribute directory.
*/
error = xattr_dir_realdir(dvp, &pvp, LOOKUP_XATTR, cr, ct);
if (error == 0) {
has_xattrs = 1;
}
/*
* Start by reading up the static entries.
*/
if (uiop->uio_loffset == 0) {
ino64_t pino, ino;
offset_t off;
gfs_dir_t *dp = dvp->v_data;
gfs_readdir_state_t gstate;
if (has_xattrs) {
/*
* If there is a real xattr dir, skip . and ..
* in the GFS dir. We'll pick them up below
* when we call into the underlying fs.
*/
uiop->uio_loffset = GFS_STATIC_ENTRY_OFFSET;
}
error = gfs_get_parent_ino(dvp, cr, ct, &pino, &ino);
if (error == 0) {
error = gfs_readdir_init(&gstate, dp->gfsd_maxlen, 1,
uiop, pino, ino, flags);
}
if (error) {
return (error);
}
while ((error = gfs_readdir_pred(&gstate, uiop, &off)) == 0 &&
!*eofp) {
if (off >= 0 && off < dp->gfsd_nstatic) {
int eflags;
/*
* Check to see if this sysattr set name has a
* case-insensitive conflict with a real xattr
* name.
*/
eflags = 0;
if ((flags & V_RDDIR_ENTFLAGS) && has_xattrs) {
error = readdir_xattr_casecmp(pvp,
dp->gfsd_static[off].gfse_name,
cr, ct, &eflags);
if (error)
break;
}
ino = dp->gfsd_inode(dvp, off);
error = gfs_readdir_emit(&gstate, uiop, off,
ino, dp->gfsd_static[off].gfse_name,
eflags);
if (error)
break;
} else {
*eofp = 1;
}
}
error = gfs_readdir_fini(&gstate, error, eofp, *eofp);
if (error) {
return (error);
}
/*
* We must read all of the static entries in the first
* call. Otherwise we won't know if uio_loffset in a
* subsequent call refers to the static entries or to those
* in an underlying fs.
*/
if (*eofp == 0)
return (EINVAL);
reset_off = 1;
}
if (!has_xattrs) {
*eofp = 1;
return (0);
}
*eofp = 0;
if (reset_off) {
uiop->uio_loffset = 0;
}
(void) VOP_RWLOCK(pvp, V_WRITELOCK_FALSE, NULL);
error = VOP_READDIR(pvp, uiop, cr, eofp, ct, flags);
VOP_RWUNLOCK(pvp, V_WRITELOCK_FALSE, NULL);
return (error);
}