From aadab6c6f4da38d639394de740602f146c88da0c Mon Sep 17 00:00:00 2001 From: "J. Bruce Fields" Date: Mon, 15 Aug 2011 16:55:02 -0400 Subject: [PATCH] nfsd4: return nfserr_symlink on v4 OPEN of non-regular file Without this, an attempt to open a device special file without first stat'ing it will fail. Signed-off-by: J. Bruce Fields --- fs/nfsd/nfs4proc.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index 9bf0a6625187..d784ceb81a62 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -168,6 +168,24 @@ do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfs return status; } +static __be32 nfsd_check_obj_isreg(struct svc_fh *fh) +{ + umode_t mode = fh->fh_dentry->d_inode->i_mode; + + if (S_ISREG(mode)) + return nfs_ok; + if (S_ISDIR(mode)) + return nfserr_isdir; + /* + * Using err_symlink as our catch-all case may look odd; but + * there's no other obvious error for this case in 4.0, and we + * happen to know that it will cause the linux v4 client to do + * the right thing on attempts to open something other than a + * regular file. + */ + return nfserr_symlink; +} + static __be32 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) { @@ -216,6 +234,9 @@ do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_o status = nfsd_lookup(rqstp, current_fh, open->op_fname.data, open->op_fname.len, &resfh); fh_unlock(current_fh); + if (status) + goto out; + status = nfsd_check_obj_isreg(&resfh); } if (status) goto out; -- 2.20.1