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nfsd: Fix stable writes

Browse Source 
Strictly speaking, a stable write error needs to reflect the
write + the commit of that write (and only that write). To
ensure that we don't pick up the write errors from other
writebacks, add a rw_semaphore to provide exclusion.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2020-01-06 13:40:30 -05:00 committed by J. Bruce Fields
parent 16f8f89410
commit 5011af4c69
3 changed files with 18 additions and 2 deletions
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1
fs/nfsd/filecache.c
View File

@ -195,6 +195,7 @@ nfsd_file_alloc(struct inode *inode, unsigned int may, unsigned int hashval,
__set_bit(NFSD_FILE_BREAK_READ, &nf->nf_flags);
}
nf->nf_mark = NULL;
init_rwsem(&nf->nf_rwsem);
trace_nfsd_file_alloc(nf);
}
return nf;

1
fs/nfsd/filecache.h
View File

@ -46,6 +46,7 @@ struct nfsd_file {
atomic_t nf_ref;
unsigned char nf_may;
struct nfsd_file_mark *nf_mark;
struct rw_semaphore nf_rwsem;
};
int nfsd_file_cache_init(void);

18
fs/nfsd/vfs.c
View File

@ -982,7 +982,18 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf,
flags |= RWF_SYNC;
iov_iter_kvec(&iter, WRITE, vec, vlen, *cnt);
host_err = vfs_iter_write(file, &iter, &pos, flags);
if (flags & RWF_SYNC) {
down_write(&nf->nf_rwsem);
host_err = vfs_iter_write(file, &iter, &pos, flags);
if (host_err < 0)
nfsd_reset_boot_verifier(net_generic(SVC_NET(rqstp),
nfsd_net_id));
up_write(&nf->nf_rwsem);
} else {
down_read(&nf->nf_rwsem);
host_err = vfs_iter_write(file, &iter, &pos, flags);
up_read(&nf->nf_rwsem);
}
if (host_err < 0)
goto out_nfserr;
*cnt = host_err;
@ -1097,8 +1108,10 @@ nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
if (err)
goto out;
if (EX_ISSYNC(fhp->fh_export)) {
int err2 = vfs_fsync_range(nf->nf_file, offset, end, 0);
int err2;
down_write(&nf->nf_rwsem);
err2 = vfs_fsync_range(nf->nf_file, offset, end, 0);
switch (err2) {
case 0:
break;
@ -1110,6 +1123,7 @@ nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
nfsd_reset_boot_verifier(net_generic(nf->nf_net,
nfsd_net_id));
}
up_write(&nf->nf_rwsem);
}
nfsd_file_put(nf);