![Greg Banks](/assets/img/avatar_default.png)
The file nfsfh.c contains two static variables nfsd_nr_verified and nfsd_nr_put. These are counters which are incremented as a side effect of the fh_verify() fh_compose() and fh_put() operations, i.e. at least twice per NFS call for any non-trivial workload. Needless to say this makes the cacheline that contains them (and any other innocent victims) a very hot contention point indeed under high call-rate workloads on multiprocessor NFS server. It also turns out that these counters are not used anywhere. They're not reported to userspace, they're not used in logic, they're not even exported from the object file (let alone the module). All they do is waste CPU time. So this patch removes them. Tests on a 16 CPU Altix A4700 with 2 10gige Myricom cards, configured separately (no bonding). Workload is 640 client threads doing directory traverals with random small reads, from server RAM. Before ====== Kernel profile: % cumulative self self total time samples samples calls 1/call 1/call name 6.05 2716.00 2716.00 30406 0.09 1.02 svc_process 4.44 4706.00 1990.00 1975 1.01 1.01 spin_unlock_irqrestore 3.72 6376.00 1670.00 1666 1.00 1.00 svc_export_put 3.41 7907.00 1531.00 1786 0.86 1.02 nfsd_ofcache_lookup 3.25 9363.00 1456.00 10965 0.13 1.01 nfsd_dispatch 3.10 10752.00 1389.00 1376 1.01 1.01 nfsd_cache_lookup 2.57 11907.00 1155.00 4517 0.26 1.03 svc_tcp_recvfrom ... 2.21 15352.00 1003.00 1081 0.93 1.00 nfsd_choose_ofc <---- ^^^^ Here the function nfsd_choose_ofc() reads a global variable which by accident happened to be located in the same cacheline as nfsd_nr_verified. Call rate: nullarbor:~ # pmdumptext nfs3.server.calls ... Thu Dec 13 00:15:27 184780.663 Thu Dec 13 00:15:28 184885.881 Thu Dec 13 00:15:29 184449.215 Thu Dec 13 00:15:30 184971.058 Thu Dec 13 00:15:31 185036.052 Thu Dec 13 00:15:32 185250.475 Thu Dec 13 00:15:33 184481.319 Thu Dec 13 00:15:34 185225.737 Thu Dec 13 00:15:35 185408.018 Thu Dec 13 00:15:36 185335.764 After ===== kernel profile: % cumulative self self total time samples samples calls 1/call 1/call name 6.33 2813.00 2813.00 29979 0.09 1.01 svc_process 4.66 4883.00 2070.00 2065 1.00 1.00 spin_unlock_irqrestore 4.06 6687.00 1804.00 2182 0.83 1.00 nfsd_ofcache_lookup 3.20 8110.00 1423.00 10932 0.13 1.00 nfsd_dispatch 3.03 9456.00 1346.00 1343 1.00 1.00 nfsd_cache_lookup 2.62 10622.00 1166.00 4645 0.25 1.01 svc_tcp_recvfrom [...] 0.10 42586.00 44.00 74 0.59 1.00 nfsd_choose_ofc <--- HA!! ^^^^ Call rate: nullarbor:~ # pmdumptext nfs3.server.calls ... Thu Dec 13 01:45:28 194677.118 Thu Dec 13 01:45:29 193932.692 Thu Dec 13 01:45:30 194294.364 Thu Dec 13 01:45:31 194971.276 Thu Dec 13 01:45:32 194111.207 Thu Dec 13 01:45:33 194999.635 Thu Dec 13 01:45:34 195312.594 Thu Dec 13 01:45:35 195707.293 Thu Dec 13 01:45:36 194610.353 Thu Dec 13 01:45:37 195913.662 Thu Dec 13 01:45:38 194808.675 i.e. about a 5.3% improvement in call rate. Signed-off-by: Greg Banks <gnb@melbourne.sgi.com> Reviewed-by: David Chinner <dgc@sgi.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
662 lines
17 KiB
C
662 lines
17 KiB
C
/*
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* linux/fs/nfsd/nfsfh.c
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*
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* NFS server file handle treatment.
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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* Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org>
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* Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999
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* ... and again Southern-Winter 2001 to support export_operations
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*/
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/unistd.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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#include <linux/dcache.h>
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#include <linux/exportfs.h>
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#include <linux/mount.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/sunrpc/svcauth_gss.h>
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#include <linux/nfsd/nfsd.h>
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#include "auth.h"
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#define NFSDDBG_FACILITY NFSDDBG_FH
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/*
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* our acceptability function.
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* if NOSUBTREECHECK, accept anything
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* if not, require that we can walk up to exp->ex_dentry
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* doing some checks on the 'x' bits
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*/
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static int nfsd_acceptable(void *expv, struct dentry *dentry)
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{
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struct svc_export *exp = expv;
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int rv;
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struct dentry *tdentry;
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struct dentry *parent;
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if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
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return 1;
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tdentry = dget(dentry);
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while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) {
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/* make sure parents give x permission to user */
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int err;
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parent = dget_parent(tdentry);
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err = inode_permission(parent->d_inode, MAY_EXEC);
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if (err < 0) {
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dput(parent);
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break;
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}
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dput(tdentry);
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tdentry = parent;
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}
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if (tdentry != exp->ex_path.dentry)
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dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name);
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rv = (tdentry == exp->ex_path.dentry);
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dput(tdentry);
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return rv;
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}
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/* Type check. The correct error return for type mismatches does not seem to be
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* generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a
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* comment in the NFSv3 spec says this is incorrect (implementation notes for
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* the write call).
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*/
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static inline __be32
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nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type)
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{
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/* Type can be negative when creating hardlinks - not to a dir */
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if (type > 0 && (mode & S_IFMT) != type) {
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if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK)
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return nfserr_symlink;
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else if (type == S_IFDIR)
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return nfserr_notdir;
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else if ((mode & S_IFMT) == S_IFDIR)
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return nfserr_isdir;
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else
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return nfserr_inval;
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}
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if (type < 0 && (mode & S_IFMT) == -type) {
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if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK)
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return nfserr_symlink;
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else if (type == -S_IFDIR)
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return nfserr_isdir;
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else
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return nfserr_notdir;
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}
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return 0;
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}
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static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
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struct svc_export *exp)
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{
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/* Check if the request originated from a secure port. */
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if (!rqstp->rq_secure && EX_SECURE(exp)) {
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RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
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dprintk(KERN_WARNING
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"nfsd: request from insecure port %s!\n",
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svc_print_addr(rqstp, buf, sizeof(buf)));
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return nfserr_perm;
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}
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/* Set user creds for this exportpoint */
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return nfserrno(nfsd_setuser(rqstp, exp));
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}
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/*
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* Use the given filehandle to look up the corresponding export and
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* dentry. On success, the results are used to set fh_export and
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* fh_dentry.
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*/
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static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
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{
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struct knfsd_fh *fh = &fhp->fh_handle;
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struct fid *fid = NULL, sfid;
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struct svc_export *exp;
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struct dentry *dentry;
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int fileid_type;
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int data_left = fh->fh_size/4;
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__be32 error;
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error = nfserr_stale;
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if (rqstp->rq_vers > 2)
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error = nfserr_badhandle;
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if (rqstp->rq_vers == 4 && fh->fh_size == 0)
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return nfserr_nofilehandle;
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if (fh->fh_version == 1) {
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int len;
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if (--data_left < 0)
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return error;
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if (fh->fh_auth_type != 0)
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return error;
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len = key_len(fh->fh_fsid_type) / 4;
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if (len == 0)
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return error;
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if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
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/* deprecated, convert to type 3 */
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len = key_len(FSID_ENCODE_DEV)/4;
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fh->fh_fsid_type = FSID_ENCODE_DEV;
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fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1])));
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fh->fh_fsid[1] = fh->fh_fsid[2];
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}
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data_left -= len;
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if (data_left < 0)
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return error;
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exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_auth);
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fid = (struct fid *)(fh->fh_auth + len);
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} else {
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__u32 tfh[2];
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dev_t xdev;
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ino_t xino;
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if (fh->fh_size != NFS_FHSIZE)
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return error;
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/* assume old filehandle format */
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xdev = old_decode_dev(fh->ofh_xdev);
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xino = u32_to_ino_t(fh->ofh_xino);
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mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
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exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
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}
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error = nfserr_stale;
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if (PTR_ERR(exp) == -ENOENT)
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return error;
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if (IS_ERR(exp))
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return nfserrno(PTR_ERR(exp));
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if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
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/* Elevate privileges so that the lack of 'r' or 'x'
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* permission on some parent directory will
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* not stop exportfs_decode_fh from being able
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* to reconnect a directory into the dentry cache.
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* The same problem can affect "SUBTREECHECK" exports,
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* but as nfsd_acceptable depends on correct
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* access control settings being in effect, we cannot
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* fix that case easily.
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*/
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struct cred *new = prepare_creds();
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if (!new)
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return nfserrno(-ENOMEM);
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new->cap_effective =
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cap_raise_nfsd_set(new->cap_effective,
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new->cap_permitted);
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put_cred(override_creds(new));
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put_cred(new);
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} else {
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error = nfsd_setuser_and_check_port(rqstp, exp);
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if (error)
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goto out;
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}
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/*
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* Look up the dentry using the NFS file handle.
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*/
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error = nfserr_stale;
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if (rqstp->rq_vers > 2)
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error = nfserr_badhandle;
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if (fh->fh_version != 1) {
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sfid.i32.ino = fh->ofh_ino;
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sfid.i32.gen = fh->ofh_generation;
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sfid.i32.parent_ino = fh->ofh_dirino;
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fid = &sfid;
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data_left = 3;
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if (fh->ofh_dirino == 0)
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fileid_type = FILEID_INO32_GEN;
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else
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fileid_type = FILEID_INO32_GEN_PARENT;
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} else
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fileid_type = fh->fh_fileid_type;
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if (fileid_type == FILEID_ROOT)
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dentry = dget(exp->ex_path.dentry);
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else {
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dentry = exportfs_decode_fh(exp->ex_path.mnt, fid,
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data_left, fileid_type,
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nfsd_acceptable, exp);
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}
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if (dentry == NULL)
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goto out;
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if (IS_ERR(dentry)) {
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if (PTR_ERR(dentry) != -EINVAL)
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error = nfserrno(PTR_ERR(dentry));
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goto out;
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}
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if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
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error = nfsd_setuser_and_check_port(rqstp, exp);
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if (error) {
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dput(dentry);
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goto out;
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}
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}
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if (S_ISDIR(dentry->d_inode->i_mode) &&
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(dentry->d_flags & DCACHE_DISCONNECTED)) {
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printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
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dentry->d_parent->d_name.name, dentry->d_name.name);
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}
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fhp->fh_dentry = dentry;
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fhp->fh_export = exp;
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return 0;
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out:
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exp_put(exp);
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return error;
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}
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/**
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* fh_verify - filehandle lookup and access checking
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* @rqstp: pointer to current rpc request
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* @fhp: filehandle to be verified
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* @type: expected type of object pointed to by filehandle
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* @access: type of access needed to object
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*
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* Look up a dentry from the on-the-wire filehandle, check the client's
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* access to the export, and set the current task's credentials.
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*
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* Regardless of success or failure of fh_verify(), fh_put() should be
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* called on @fhp when the caller is finished with the filehandle.
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*
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* fh_verify() may be called multiple times on a given filehandle, for
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* example, when processing an NFSv4 compound. The first call will look
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* up a dentry using the on-the-wire filehandle. Subsequent calls will
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* skip the lookup and just perform the other checks and possibly change
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* the current task's credentials.
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*
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* @type specifies the type of object expected using one of the S_IF*
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* constants defined in include/linux/stat.h. The caller may use zero
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* to indicate that it doesn't care, or a negative integer to indicate
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* that it expects something not of the given type.
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*
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* @access is formed from the NFSD_MAY_* constants defined in
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* include/linux/nfsd/nfsd.h.
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*/
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__be32
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fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
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{
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struct svc_export *exp;
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struct dentry *dentry;
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__be32 error;
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dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
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if (!fhp->fh_dentry) {
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error = nfsd_set_fh_dentry(rqstp, fhp);
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if (error)
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goto out;
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dentry = fhp->fh_dentry;
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exp = fhp->fh_export;
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} else {
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/*
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* just rechecking permissions
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* (e.g. nfsproc_create calls fh_verify, then nfsd_create
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* does as well)
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*/
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dprintk("nfsd: fh_verify - just checking\n");
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dentry = fhp->fh_dentry;
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exp = fhp->fh_export;
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/*
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* Set user creds for this exportpoint; necessary even
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* in the "just checking" case because this may be a
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* filehandle that was created by fh_compose, and that
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* is about to be used in another nfsv4 compound
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* operation.
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*/
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error = nfsd_setuser_and_check_port(rqstp, exp);
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if (error)
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goto out;
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}
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error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type);
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if (error)
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goto out;
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/*
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* pseudoflavor restrictions are not enforced on NLM,
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* which clients virtually always use auth_sys for,
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* even while using RPCSEC_GSS for NFS.
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*/
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if (access & NFSD_MAY_LOCK)
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goto skip_pseudoflavor_check;
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/*
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* Clients may expect to be able to use auth_sys during mount,
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* even if they use gss for everything else; see section 2.3.2
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* of rfc 2623.
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*/
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if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT
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&& exp->ex_path.dentry == dentry)
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goto skip_pseudoflavor_check;
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error = check_nfsd_access(exp, rqstp);
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if (error)
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goto out;
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skip_pseudoflavor_check:
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/* Finally, check access permissions. */
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error = nfsd_permission(rqstp, exp, dentry, access);
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if (error) {
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dprintk("fh_verify: %s/%s permission failure, "
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"acc=%x, error=%d\n",
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dentry->d_parent->d_name.name,
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dentry->d_name.name,
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access, ntohl(error));
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}
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out:
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if (error == nfserr_stale)
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nfsdstats.fh_stale++;
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return error;
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}
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/*
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* Compose a file handle for an NFS reply.
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*
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* Note that when first composed, the dentry may not yet have
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* an inode. In this case a call to fh_update should be made
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* before the fh goes out on the wire ...
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*/
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static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
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struct dentry *dentry)
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{
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if (dentry != exp->ex_path.dentry) {
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struct fid *fid = (struct fid *)
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(fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1);
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int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
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int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);
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fhp->fh_handle.fh_fileid_type =
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exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
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fhp->fh_handle.fh_size += maxsize * 4;
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} else {
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fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
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}
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}
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/*
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* for composing old style file handles
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*/
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static inline void _fh_update_old(struct dentry *dentry,
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struct svc_export *exp,
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struct knfsd_fh *fh)
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{
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fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino);
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fh->ofh_generation = dentry->d_inode->i_generation;
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if (S_ISDIR(dentry->d_inode->i_mode) ||
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(exp->ex_flags & NFSEXP_NOSUBTREECHECK))
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fh->ofh_dirino = 0;
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}
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__be32
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fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
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struct svc_fh *ref_fh)
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{
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/* ref_fh is a reference file handle.
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* if it is non-null and for the same filesystem, then we should compose
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* a filehandle which is of the same version, where possible.
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* Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
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* Then create a 32byte filehandle using nfs_fhbase_old
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*
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*/
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u8 version;
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u8 fsid_type = 0;
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struct inode * inode = dentry->d_inode;
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struct dentry *parent = dentry->d_parent;
|
|
__u32 *datap;
|
|
dev_t ex_dev = exp->ex_path.dentry->d_inode->i_sb->s_dev;
|
|
int root_export = (exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root);
|
|
|
|
dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
|
|
MAJOR(ex_dev), MINOR(ex_dev),
|
|
(long) exp->ex_path.dentry->d_inode->i_ino,
|
|
parent->d_name.name, dentry->d_name.name,
|
|
(inode ? inode->i_ino : 0));
|
|
|
|
/* Choose filehandle version and fsid type based on
|
|
* the reference filehandle (if it is in the same export)
|
|
* or the export options.
|
|
*/
|
|
retry:
|
|
version = 1;
|
|
if (ref_fh && ref_fh->fh_export == exp) {
|
|
version = ref_fh->fh_handle.fh_version;
|
|
fsid_type = ref_fh->fh_handle.fh_fsid_type;
|
|
|
|
if (ref_fh == fhp)
|
|
fh_put(ref_fh);
|
|
ref_fh = NULL;
|
|
|
|
switch (version) {
|
|
case 0xca:
|
|
fsid_type = FSID_DEV;
|
|
break;
|
|
case 1:
|
|
break;
|
|
default:
|
|
goto retry;
|
|
}
|
|
|
|
/* Need to check that this type works for this
|
|
* export point. As the fsid -> filesystem mapping
|
|
* was guided by user-space, there is no guarantee
|
|
* that the filesystem actually supports that fsid
|
|
* type. If it doesn't we loop around again without
|
|
* ref_fh set.
|
|
*/
|
|
switch(fsid_type) {
|
|
case FSID_DEV:
|
|
if (!old_valid_dev(ex_dev))
|
|
goto retry;
|
|
/* FALL THROUGH */
|
|
case FSID_MAJOR_MINOR:
|
|
case FSID_ENCODE_DEV:
|
|
if (!(exp->ex_path.dentry->d_inode->i_sb->s_type->fs_flags
|
|
& FS_REQUIRES_DEV))
|
|
goto retry;
|
|
break;
|
|
case FSID_NUM:
|
|
if (! (exp->ex_flags & NFSEXP_FSID))
|
|
goto retry;
|
|
break;
|
|
case FSID_UUID8:
|
|
case FSID_UUID16:
|
|
if (!root_export)
|
|
goto retry;
|
|
/* fall through */
|
|
case FSID_UUID4_INUM:
|
|
case FSID_UUID16_INUM:
|
|
if (exp->ex_uuid == NULL)
|
|
goto retry;
|
|
break;
|
|
}
|
|
} else if (exp->ex_flags & NFSEXP_FSID) {
|
|
fsid_type = FSID_NUM;
|
|
} else if (exp->ex_uuid) {
|
|
if (fhp->fh_maxsize >= 64) {
|
|
if (root_export)
|
|
fsid_type = FSID_UUID16;
|
|
else
|
|
fsid_type = FSID_UUID16_INUM;
|
|
} else {
|
|
if (root_export)
|
|
fsid_type = FSID_UUID8;
|
|
else
|
|
fsid_type = FSID_UUID4_INUM;
|
|
}
|
|
} else if (!old_valid_dev(ex_dev))
|
|
/* for newer device numbers, we must use a newer fsid format */
|
|
fsid_type = FSID_ENCODE_DEV;
|
|
else
|
|
fsid_type = FSID_DEV;
|
|
|
|
if (ref_fh == fhp)
|
|
fh_put(ref_fh);
|
|
|
|
if (fhp->fh_locked || fhp->fh_dentry) {
|
|
printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n",
|
|
parent->d_name.name, dentry->d_name.name);
|
|
}
|
|
if (fhp->fh_maxsize < NFS_FHSIZE)
|
|
printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n",
|
|
fhp->fh_maxsize,
|
|
parent->d_name.name, dentry->d_name.name);
|
|
|
|
fhp->fh_dentry = dget(dentry); /* our internal copy */
|
|
fhp->fh_export = exp;
|
|
cache_get(&exp->h);
|
|
|
|
if (version == 0xca) {
|
|
/* old style filehandle please */
|
|
memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
|
|
fhp->fh_handle.fh_size = NFS_FHSIZE;
|
|
fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
|
|
fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev);
|
|
fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
|
|
fhp->fh_handle.ofh_xino =
|
|
ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino);
|
|
fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
|
|
if (inode)
|
|
_fh_update_old(dentry, exp, &fhp->fh_handle);
|
|
} else {
|
|
int len;
|
|
fhp->fh_handle.fh_version = 1;
|
|
fhp->fh_handle.fh_auth_type = 0;
|
|
datap = fhp->fh_handle.fh_auth+0;
|
|
fhp->fh_handle.fh_fsid_type = fsid_type;
|
|
mk_fsid(fsid_type, datap, ex_dev,
|
|
exp->ex_path.dentry->d_inode->i_ino,
|
|
exp->ex_fsid, exp->ex_uuid);
|
|
|
|
len = key_len(fsid_type);
|
|
datap += len/4;
|
|
fhp->fh_handle.fh_size = 4 + len;
|
|
|
|
if (inode)
|
|
_fh_update(fhp, exp, dentry);
|
|
if (fhp->fh_handle.fh_fileid_type == 255)
|
|
return nfserr_opnotsupp;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Update file handle information after changing a dentry.
|
|
* This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
|
|
*/
|
|
__be32
|
|
fh_update(struct svc_fh *fhp)
|
|
{
|
|
struct dentry *dentry;
|
|
|
|
if (!fhp->fh_dentry)
|
|
goto out_bad;
|
|
|
|
dentry = fhp->fh_dentry;
|
|
if (!dentry->d_inode)
|
|
goto out_negative;
|
|
if (fhp->fh_handle.fh_version != 1) {
|
|
_fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
|
|
} else {
|
|
if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
|
|
goto out;
|
|
|
|
_fh_update(fhp, fhp->fh_export, dentry);
|
|
if (fhp->fh_handle.fh_fileid_type == 255)
|
|
return nfserr_opnotsupp;
|
|
}
|
|
out:
|
|
return 0;
|
|
|
|
out_bad:
|
|
printk(KERN_ERR "fh_update: fh not verified!\n");
|
|
goto out;
|
|
out_negative:
|
|
printk(KERN_ERR "fh_update: %s/%s still negative!\n",
|
|
dentry->d_parent->d_name.name, dentry->d_name.name);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Release a file handle.
|
|
*/
|
|
void
|
|
fh_put(struct svc_fh *fhp)
|
|
{
|
|
struct dentry * dentry = fhp->fh_dentry;
|
|
struct svc_export * exp = fhp->fh_export;
|
|
if (dentry) {
|
|
fh_unlock(fhp);
|
|
fhp->fh_dentry = NULL;
|
|
dput(dentry);
|
|
#ifdef CONFIG_NFSD_V3
|
|
fhp->fh_pre_saved = 0;
|
|
fhp->fh_post_saved = 0;
|
|
#endif
|
|
}
|
|
if (exp) {
|
|
cache_put(&exp->h, &svc_export_cache);
|
|
fhp->fh_export = NULL;
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Shorthand for dprintk()'s
|
|
*/
|
|
char * SVCFH_fmt(struct svc_fh *fhp)
|
|
{
|
|
struct knfsd_fh *fh = &fhp->fh_handle;
|
|
|
|
static char buf[80];
|
|
sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
|
|
fh->fh_size,
|
|
fh->fh_base.fh_pad[0],
|
|
fh->fh_base.fh_pad[1],
|
|
fh->fh_base.fh_pad[2],
|
|
fh->fh_base.fh_pad[3],
|
|
fh->fh_base.fh_pad[4],
|
|
fh->fh_base.fh_pad[5]);
|
|
return buf;
|
|
}
|
|
|
|
enum fsid_source fsid_source(struct svc_fh *fhp)
|
|
{
|
|
if (fhp->fh_handle.fh_version != 1)
|
|
return FSIDSOURCE_DEV;
|
|
switch(fhp->fh_handle.fh_fsid_type) {
|
|
case FSID_DEV:
|
|
case FSID_ENCODE_DEV:
|
|
case FSID_MAJOR_MINOR:
|
|
if (fhp->fh_export->ex_path.dentry->d_inode->i_sb->s_type->fs_flags
|
|
& FS_REQUIRES_DEV)
|
|
return FSIDSOURCE_DEV;
|
|
break;
|
|
case FSID_NUM:
|
|
if (fhp->fh_export->ex_flags & NFSEXP_FSID)
|
|
return FSIDSOURCE_FSID;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
/* either a UUID type filehandle, or the filehandle doesn't
|
|
* match the export.
|
|
*/
|
|
if (fhp->fh_export->ex_flags & NFSEXP_FSID)
|
|
return FSIDSOURCE_FSID;
|
|
if (fhp->fh_export->ex_uuid)
|
|
return FSIDSOURCE_UUID;
|
|
return FSIDSOURCE_DEV;
|
|
}
|