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nfsd: Ensure that nfsd_create_setattr commits files to stable storage 

Since nfsd_create_setattr strips the mode from the struct iattr, it
is quite possible that it will optimise away the call to nfsd_setattr
altogether.
If this is the case, then we never call commit_metadata() on the
newly created file.

Also ensure that both nfsd_setattr() and nfsd_create_setattr() fail
when the call to commit_metadata fails.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2014-07-01 18:27:53 -04:00 committed by J. Bruce Fields
parent 1e444f5bc0
commit 0f3a24b43b
1 changed files with 9 additions and 6 deletions
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15
fs/nfsd/vfs.c
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@ -463,7 +463,7 @@ out_put_write_access:
if (size_change)
put_write_access(inode);
if (!err)
commit_metadata(fhp);
err = commit_metadata(fhp);
out:
return err;
}
@ -1121,7 +1121,8 @@ nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp,
iap->ia_valid &= ~(ATTR_UID|ATTR_GID);
if (iap->ia_valid)
return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
return 0;
/* Callers expect file metadata to be committed here */
return commit_metadata(resfhp);
}
/* HPUX client sometimes creates a file in mode 000, and sets size to 0.
@ -1253,9 +1254,10 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
err = nfsd_create_setattr(rqstp, resfhp, iap);
/*
* nfsd_setattr already committed the child. Transactional filesystems
* had a chance to commit changes for both parent and child
* simultaneously making the following commit_metadata a noop.
* nfsd_create_setattr already committed the child. Transactional
* filesystems had a chance to commit changes for both parent and
* child * simultaneously making the following commit_metadata a
* noop.
*/
err2 = nfserrno(commit_metadata(fhp));
if (err2)
@ -1426,7 +1428,8 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
err = nfsd_create_setattr(rqstp, resfhp, iap);
/*
* nfsd_setattr already committed the child (and possibly also the parent).
* nfsd_create_setattr already committed the child
* (and possibly also the parent).
*/
if (!err)
err = nfserrno(commit_metadata(fhp));