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Bruce Fields wrote: > On Thu, Mar 24, 2022 at 09:34:45PM -0700, Dai Ngo wrote: >> Update nfs4_get_vfs_file and nfs4_upgrade_open to handle share >> reservation conflict with courtesy client. >> >> Update nfs4_get_vfs_file and nfs4_upgrade_open to handle share >> reservation conflict with courtesy client. >> >> When we have deny/access conflict we walk the fi_stateids of the >> file in question, looking for open stateid and check the deny/access >> of that stateid against the one from the open request. If there is >> a conflict then we check if the client that owns that stateid is >> a courtesy client. If it is then we set the client state to >> CLIENT_EXPIRED and allow the open request to continue. We have >> to scan all the stateid's of the file since the conflict can be >> caused by multiple open stateid's. >> >> Client with CLIENT_EXPIRED is expired by the laundromat. >> >> Signed-off-by: Dai Ngo >> --- >> fs/nfsd/nfs4state.c | 85 +++++++++++++++++++++++++++++++++++++++++++++-------- >> 1 file changed, 72 insertions(+), 13 deletions(-) >> >> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c >> index f20c75890594..fe8969ba94b3 100644 >> --- a/fs/nfsd/nfs4state.c >> +++ b/fs/nfsd/nfs4state.c >> @@ -701,9 +701,56 @@ __nfs4_file_get_access(struct nfs4_file *fp, u32 access) >> atomic_inc(&fp->fi_access[O_RDONLY]); >> } >> >> +/* >> + * Check if courtesy clients have conflicting access and resolve it if possible >> + * >> + * access: is op_share_access if share_access is true. >> + * Check if access mode, op_share_access, would conflict with >> + * the current deny mode of the file 'fp'. >> + * access: is op_share_deny if share_access is false. >> + * Check if the deny mode, op_share_deny, would conflict with >> + * current access of the file 'fp'. >> + * stp: skip checking this entry. >> + * new_stp: normal open, not open upgrade. >> + * >> + * Function returns: >> + * false - access/deny mode conflict with normal client. >> + * true - no conflict or conflict with courtesy client(s) is resolved. >> + */ >> +static bool >> +nfs4_resolve_deny_conflicts_locked(struct nfs4_file *fp, bool new_stp, >> + struct nfs4_ol_stateid *stp, u32 access, bool share_access) >> +{ >> + struct nfs4_ol_stateid *st; >> + struct nfs4_client *clp; >> + bool conflict = true; >> + unsigned char bmap; >> + >> + lockdep_assert_held(&fp->fi_lock); >> + list_for_each_entry(st, &fp->fi_stateids, st_perfile) { >> + /* ignore lock stateid */ >> + if (st->st_openstp) >> + continue; >> + if (st == stp && new_stp) >> + continue; >> + /* check file access against deny mode or vice versa */ >> + bmap = share_access ? st->st_deny_bmap : st->st_access_bmap; >> + if (!(access & bmap_to_share_mode(bmap))) >> + continue; > As I said before, I recommend just doing *both* checks here. Then you > can remove the "bool share_access" argument. I think that'll make the > code easier to read. Bruce, I'm not clear how to check both here as I mentioned in my previous email. nfs4_resolve_deny_conflicts_locked is called from nfs4_file_get_access and nfs4_file_check_deny to check either access or deny mode separately so how do we check both access and deny in nfs4_resolve_deny_conflicts_locked? Thanks, -Dai > > Otherwise, this version looks OK to me, thanks for the revisions. > > --b. > >> + clp = st->st_stid.sc_client; >> + if (nfsd4_expire_courtesy_clnt(clp)) >> + continue; >> + conflict = false; >> + break; >> + } >> + return conflict; >> +} >> + >> static __be32 >> -nfs4_file_get_access(struct nfs4_file *fp, u32 access) >> +nfs4_file_get_access(struct nfs4_file *fp, u32 access, >> + struct nfs4_ol_stateid *stp, bool new_stp) >> { >> + >> lockdep_assert_held(&fp->fi_lock); >> >> /* Does this access mode make sense? */ >> @@ -711,15 +758,21 @@ nfs4_file_get_access(struct nfs4_file *fp, u32 access) >> return nfserr_inval; >> >> /* Does it conflict with a deny mode already set? */ >> - if ((access & fp->fi_share_deny) != 0) >> - return nfserr_share_denied; >> + if ((access & fp->fi_share_deny) != 0) { >> + if (!nfs4_resolve_deny_conflicts_locked(fp, new_stp, >> + stp, access, true)) >> + return nfserr_share_denied; >> + } >> >> __nfs4_file_get_access(fp, access); >> return nfs_ok; >> } >> >> -static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny) >> +static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny, >> + struct nfs4_ol_stateid *stp, bool new_stp) >> { >> + __be32 rc = nfs_ok; >> + >> /* Common case is that there is no deny mode. */ >> if (deny) { >> /* Does this deny mode make sense? */ >> @@ -728,13 +781,19 @@ static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny) >> >> if ((deny & NFS4_SHARE_DENY_READ) && >> atomic_read(&fp->fi_access[O_RDONLY])) >> - return nfserr_share_denied; >> + rc = nfserr_share_denied; >> >> if ((deny & NFS4_SHARE_DENY_WRITE) && >> atomic_read(&fp->fi_access[O_WRONLY])) >> - return nfserr_share_denied; >> + rc = nfserr_share_denied; >> + >> + if (rc == nfserr_share_denied) { >> + if (nfs4_resolve_deny_conflicts_locked(fp, new_stp, >> + stp, deny, false)) >> + rc = nfs_ok; >> + } >> } >> - return nfs_ok; >> + return rc; >> } >> >> static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag) >> @@ -4952,7 +5011,7 @@ nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, >> >> static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp, >> struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, >> - struct nfsd4_open *open) >> + struct nfsd4_open *open, bool new_stp) >> { >> struct nfsd_file *nf = NULL; >> __be32 status; >> @@ -4966,14 +5025,14 @@ static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp, >> * Are we trying to set a deny mode that would conflict with >> * current access? >> */ >> - status = nfs4_file_check_deny(fp, open->op_share_deny); >> + status = nfs4_file_check_deny(fp, open->op_share_deny, stp, new_stp); >> if (status != nfs_ok) { >> spin_unlock(&fp->fi_lock); >> goto out; >> } >> >> /* set access to the file */ >> - status = nfs4_file_get_access(fp, open->op_share_access); >> + status = nfs4_file_get_access(fp, open->op_share_access, stp, new_stp); >> if (status != nfs_ok) { >> spin_unlock(&fp->fi_lock); >> goto out; >> @@ -5027,11 +5086,11 @@ nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *c >> unsigned char old_deny_bmap = stp->st_deny_bmap; >> >> if (!test_access(open->op_share_access, stp)) >> - return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open); >> + return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open, false); >> >> /* test and set deny mode */ >> spin_lock(&fp->fi_lock); >> - status = nfs4_file_check_deny(fp, open->op_share_deny); >> + status = nfs4_file_check_deny(fp, open->op_share_deny, stp, false); >> if (status == nfs_ok) { >> set_deny(open->op_share_deny, stp); >> fp->fi_share_deny |= >> @@ -5376,7 +5435,7 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf >> goto out; >> } >> } else { >> - status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open); >> + status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open, true); >> if (status) { >> stp->st_stid.sc_type = NFS4_CLOSED_STID; >> release_open_stateid(stp); >> -- >> 2.9.5