From 43b0e7ea590b51052384ecedf4ad7c8d7898e8e7 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Sun, 3 May 2015 09:16:53 +1000 Subject: [PATCH] nfsd: stop READDIRPLUS returning inconsistent attributes The NFSv3 READDIRPLUS gets some of the returned attributes from the readdir, and some from an inode returned from a new lookup. The two objects could be different thanks to intervening renames. The attributes in READDIRPLUS are optional, so let's just skip them if we notice this case. Signed-off-by: NeilBrown Signed-off-by: J. Bruce Fields --- fs/nfsd/nfs3xdr.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c index e4b2b4322553..f6e7cbabac5a 100644 --- a/fs/nfsd/nfs3xdr.c +++ b/fs/nfsd/nfs3xdr.c @@ -805,7 +805,7 @@ encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, static __be32 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, - const char *name, int namlen) + const char *name, int namlen, u64 ino) { struct svc_export *exp; struct dentry *dparent, *dchild; @@ -830,19 +830,21 @@ compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, goto out; if (d_really_is_negative(dchild)) goto out; + if (dchild->d_inode->i_ino != ino) + goto out; rv = fh_compose(fhp, exp, dchild, &cd->fh); out: dput(dchild); return rv; } -static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen) +static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino) { struct svc_fh *fh = &cd->scratch; __be32 err; fh_init(fh, NFS3_FHSIZE); - err = compose_entry_fh(cd, fh, name, namlen); + err = compose_entry_fh(cd, fh, name, namlen, ino); if (err) { *p++ = 0; *p++ = 0; @@ -927,7 +929,7 @@ encode_entry(struct readdir_cd *ccd, const char *name, int namlen, p = encode_entry_baggage(cd, p, name, namlen, ino); if (plus) - p = encode_entryplus_baggage(cd, p, name, namlen); + p = encode_entryplus_baggage(cd, p, name, namlen, ino); num_entry_words = p - cd->buffer; } else if (*(page+1) != NULL) { /* temporarily encode entry into next page, then move back to @@ -941,7 +943,7 @@ encode_entry(struct readdir_cd *ccd, const char *name, int namlen, p1 = encode_entry_baggage(cd, p1, name, namlen, ino); if (plus) - p1 = encode_entryplus_baggage(cd, p1, name, namlen); + p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino); /* determine entry word length and lengths to go in pages */ num_entry_words = p1 - tmp;