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Fix the getdirentries of ibcs2 to handle uneven DIRBLKSIZ offsets.

Browse Source 
Same bug as was in linux.

Also, fix problem where an entry would be skipped next call if not enough room
in buffer current call.
This commit is contained in:
Steven Wallace 1995-10-10 23:12:53 +00:00
parent 1d5aafcd70
commit 4b0855b73b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=11417
1 changed files with 32 additions and 17 deletions
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49
sys/i386/ibcs2/ibcs2_misc.c
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@ -314,7 +314,7 @@ ibcs2_getdents(p, uap, retval)
struct iovec aiov;
struct ibcs2_dirent idb;
off_t off; /* true file offset */
int buflen, error, eofflag;
int buflen, error, eofflag, blockoff;
#define BSD_DIRENT(cp) ((struct direct *)(cp))
#define IBCS2_RECLEN(reclen) (reclen + sizeof(u_short))
@ -325,10 +325,13 @@ ibcs2_getdents(p, uap, retval)
vp = (struct vnode *)fp->f_data;
if (vp->v_type != VDIR) /* XXX vnode readdir op should do this */
return (EINVAL);
buflen = min(MAXBSIZE, SCARG(uap, nbytes));
off = fp->f_offset;
blockoff = off % DIRBLKSIZ;
buflen = max(DIRBLKSIZ, SCARG(uap, nbytes) + blockoff);
buflen = min(buflen, MAXBSIZE);
buf = malloc(buflen, M_TEMP, M_WAITOK);
VOP_LOCK(vp);
off = fp->f_offset;
again:
aiov.iov_base = buf;
aiov.iov_len = buflen;
@ -338,7 +341,7 @@ ibcs2_getdents(p, uap, retval)
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_procp = p;
auio.uio_resid = buflen;
auio.uio_offset = off;
auio.uio_offset = off - (off_t)blockoff;
/*
* First we read into the malloc'ed buffer, then
* we massage it into user space, one record at a time.
@ -346,17 +349,21 @@ ibcs2_getdents(p, uap, retval)
if (error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL))
goto out;
inp = buf;
inp += blockoff;
outp = SCARG(uap, buf);
resid = SCARG(uap, nbytes);
if ((len = buflen - auio.uio_resid) == 0)
if ((len = buflen - auio.uio_resid - blockoff) == 0)
goto eof;
for (; len > 0; len -= reclen) {
reclen = BSD_DIRENT(inp)->d_reclen;
if (reclen & 3)
panic("ibcs2_getdents");
off += reclen; /* each entry points to next */
if (reclen & 3) {
printf("ibcs2_getdents: reclen=%d\n", reclen);
error = EFAULT;
goto out;
}
if (BSD_DIRENT(inp)->d_ino == 0) {
inp += reclen; /* it is a hole; squish it out */
off += reclen;
continue;
}
if (reclen > len || resid < IBCS2_RECLEN(reclen)) {
@ -377,6 +384,7 @@ ibcs2_getdents(p, uap, retval)
BSD_DIRENT(inp)->d_namlen + 1)) != 0)
goto out;
/* advance past this real entry */
off += reclen;
inp += reclen;
/* advance output past iBCS2-shaped entry */
outp += IBCS2_RECLEN(reclen);
@ -413,7 +421,7 @@ ibcs2_read(p, uap, retval)
char name[14];
} idb;
off_t off; /* true file offset */
int buflen, error, eofflag, size;
int buflen, error, eofflag, size, blockoff;
if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) {
if (error == EINVAL)
@ -426,11 +434,15 @@ ibcs2_read(p, uap, retval)
vp = (struct vnode *)fp->f_data;
if (vp->v_type != VDIR)
return read(p, (struct read_args *)uap, retval);
DPRINTF(("ibcs2_read: read directory\n"));
buflen = max(MAXBSIZE, SCARG(uap, nbytes));
off = fp->f_offset;
blockoff = off % DIRBLKSIZ;
buflen = max(DIRBLKSIZ, SCARG(uap, nbytes) + blockoff);
buflen = min(buflen, MAXBSIZE);
buf = malloc(buflen, M_TEMP, M_WAITOK);
VOP_LOCK(vp);
off = fp->f_offset;
again:
aiov.iov_base = buf;
aiov.iov_len = buflen;
@ -440,7 +452,7 @@ ibcs2_read(p, uap, retval)
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_procp = p;
auio.uio_resid = buflen;
auio.uio_offset = off & ~(DIRBLKSIZ - 1);
auio.uio_offset = off - (off_t)blockoff;
/*
* First we read into the malloc'ed buffer, then
* we massage it into user space, one record at a time.
@ -449,16 +461,19 @@ ibcs2_read(p, uap, retval)
DPRINTF(("VOP_READDIR failed: %d\n", error));
goto out;
}
inp = buf + (off & (DIRBLKSIZ - 1));
buflen -= off & (DIRBLKSIZ - 1);
inp = buf;
inp += blockoff;
outp = SCARG(uap, buf);
resid = SCARG(uap, nbytes);
if ((len = buflen - auio.uio_resid) == 0)
if ((len = buflen - auio.uio_resid - blockoff) == 0)
goto eof;
for (; len > 0 && resid > 0; len -= reclen) {
reclen = BSD_DIRENT(inp)->d_reclen;
if (reclen & 3)
panic("ibcs2_read");
if (reclen & 3) {
printf("ibcs2_read: reclen=%d\n", reclen);
error = EFAULT;
goto out;
}
if (BSD_DIRENT(inp)->d_ino == 0) {
inp += reclen; /* it is a hole; squish it out */
off += reclen;