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ZFS might not return monotonically increasing directory offset cookies,

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so turn off UFS-specific hack that assumes so in ZFS case.
Before the change we can miss returning some directory entries to a
NFS client.

I believe that the hack should be moved to ufs_readdir(), but until we find
somebody who will do it, turn it off for ZFS in NFS server code.

Submitted by:	rmacklem
Discussed with:	rmacklem, mckusick
MFC after:	3 days
This commit is contained in:
Pawel Jakub Dawidek 2010-12-28 21:12:15 +00:00
parent 1dadcedcfc
commit 8449945a4d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=216774
1 changed files with 10 additions and 3 deletions
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13
sys/nfsserver/nfs_serv.c
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@ -2737,7 +2737,7 @@ nfsrv_readdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
int v3 = (nfsd->nd_flag & ND_NFSV3);
u_quad_t off, toff, verf;
u_long *cookies = NULL, *cookiep; /* needs to be int64_t or off_t */
int vfslocked;
int vfslocked, not_zfs;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
@ -2801,6 +2801,7 @@ nfsrv_readdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
error = 0;
goto nfsmout;
}
not_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") != 0;
VOP_UNLOCK(vp, 0);
/*
@ -2887,10 +2888,12 @@ nfsrv_readdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
* skip over the records that precede the requested offset. This
* requires the assumption that file offset cookies monotonically
* increase.
* Since the offset cookies don't monotonically increase for ZFS,
* this is not done when ZFS is the file system.
*/
while (cpos < cend && ncookies > 0 &&
(dp->d_fileno == 0 || dp->d_type == DT_WHT ||
((u_quad_t)(*cookiep)) <= toff)) {
(not_zfs != 0 && ((u_quad_t)(*cookiep)) <= toff))) {
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
@ -3037,6 +3040,7 @@ nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
int usevget = 1, vfslocked;
struct componentname cn;
struct mount *mntp = NULL;
int not_zfs;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
@ -3097,6 +3101,7 @@ nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
error = 0;
goto nfsmout;
}
not_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") != 0;
VOP_UNLOCK(vp, 0);
vp_locked = 0;
rbuf = malloc(siz, M_TEMP, M_WAITOK);
@ -3176,10 +3181,12 @@ nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
* skip over the records that precede the requested offset. This
* requires the assumption that file offset cookies monotonically
* increase.
* Since the offset cookies don't monotonically increase for ZFS,
* this is not done when ZFS is the file system.
*/
while (cpos < cend && ncookies > 0 &&
(dp->d_fileno == 0 || dp->d_type == DT_WHT ||
((u_quad_t)(*cookiep)) <= toff)) {
(not_zfs != 0 && ((u_quad_t)(*cookiep)) <= toff))) {
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;