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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 <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
NeilBrown 2015-05-03 09:16:53 +10:00 committed by J. Bruce Fields
parent 72faedae8b
commit 43b0e7ea59
1 changed files with 7 additions and 5 deletions
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12
fs/nfsd/nfs3xdr.c
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@ -805,7 +805,7 @@ encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
static __be32 static __be32
compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, 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 svc_export *exp;
struct dentry *dparent, *dchild; struct dentry *dparent, *dchild;
@ -830,19 +830,21 @@ compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
goto out; goto out;
if (d_really_is_negative(dchild)) if (d_really_is_negative(dchild))
goto out; goto out;
if (dchild->d_inode->i_ino != ino)
goto out;
rv = fh_compose(fhp, exp, dchild, &cd->fh); rv = fh_compose(fhp, exp, dchild, &cd->fh);
out: out:
dput(dchild); dput(dchild);
return rv; 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; struct svc_fh *fh = &cd->scratch;
__be32 err; __be32 err;
fh_init(fh, NFS3_FHSIZE); fh_init(fh, NFS3_FHSIZE);
err = compose_entry_fh(cd, fh, name, namlen); err = compose_entry_fh(cd, fh, name, namlen, ino);
if (err) { if (err) {
*p++ = 0; *p++ = 0;
*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); p = encode_entry_baggage(cd, p, name, namlen, ino);
if (plus) 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; num_entry_words = p - cd->buffer;
} else if (*(page+1) != NULL) { } else if (*(page+1) != NULL) {
/* temporarily encode entry into next page, then move back to /* 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); p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
if (plus) 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 */ /* determine entry word length and lengths to go in pages */
num_entry_words = p1 - tmp; num_entry_words = p1 - tmp;