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Diffstat (limited to 'fs/nfsd/nfsfh.c')
-rw-r--r--fs/nfsd/nfsfh.c124
1 files changed, 60 insertions, 64 deletions
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index a0b4282cb284..12c5e7421374 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -212,7 +212,7 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
fileid_type = 2;
} else
fileid_type = fh->fh_fileid_type;
-
+
if (fileid_type == 0)
dentry = dget(exp->ex_dentry);
else {
@@ -292,7 +292,7 @@ static inline int _fh_update(struct dentry *dentry, struct svc_export *exp,
__u32 *datap, int *maxsize)
{
struct export_operations *nop = exp->ex_mnt->mnt_sb->s_export_op;
-
+
if (dentry == exp->ex_dentry) {
*maxsize = 0;
return 0;
@@ -317,7 +317,8 @@ static inline void _fh_update_old(struct dentry *dentry,
}
__be32
-fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, struct svc_fh *ref_fh)
+fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
+ struct svc_fh *ref_fh)
{
/* ref_fh is a reference file handle.
* if it is non-null and for the same filesystem, then we should compose
@@ -327,8 +328,8 @@ fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, st
*
*/
- u8 ref_fh_version = 0;
- u8 ref_fh_fsid_type = 0;
+ u8 version = 1;
+ u8 fsid_type = 0;
struct inode * inode = dentry->d_inode;
struct dentry *parent = dentry->d_parent;
__u32 *datap;
@@ -340,57 +341,52 @@ fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, st
parent->d_name.name, dentry->d_name.name,
(inode ? inode->i_ino : 0));
+ /* Choose filehandle version and fsid type based on
+ * the reference filehandle (if it is in the same export)
+ * or the export options.
+ */
if (ref_fh && ref_fh->fh_export == exp) {
- ref_fh_version = ref_fh->fh_handle.fh_version;
- if (ref_fh_version == 0xca)
- ref_fh_fsid_type = 0;
+ version = ref_fh->fh_handle.fh_version;
+ if (version == 0xca)
+ fsid_type = 0;
else
- ref_fh_fsid_type = ref_fh->fh_handle.fh_fsid_type;
- if (ref_fh_fsid_type > 3)
- ref_fh_fsid_type = 0;
-
- /* make sure ref_fh type works for given export */
- if (ref_fh_fsid_type == 1 &&
- !(exp->ex_flags & NFSEXP_FSID)) {
- /* if we don't have an fsid, we cannot provide one... */
- ref_fh_fsid_type = 0;
- }
+ fsid_type = ref_fh->fh_handle.fh_fsid_type;
+ /* We know this version/type works for this export
+ * so there is no need for further checks.
+ */
} else if (exp->ex_flags & NFSEXP_FSID)
- ref_fh_fsid_type = 1;
-
- if (!old_valid_dev(ex_dev) && ref_fh_fsid_type == 0) {
+ fsid_type = 1;
+ else if (!old_valid_dev(ex_dev))
/* for newer device numbers, we must use a newer fsid format */
- ref_fh_version = 1;
- ref_fh_fsid_type = 3;
- }
- if (old_valid_dev(ex_dev) &&
- (ref_fh_fsid_type == 2 || ref_fh_fsid_type == 3))
- /* must use type1 for smaller device numbers */
- ref_fh_fsid_type = 0;
+ fsid_type = 3;
+ else
+ fsid_type = 0;
if (ref_fh == fhp)
fh_put(ref_fh);
if (fhp->fh_locked || fhp->fh_dentry) {
printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n",
- parent->d_name.name, dentry->d_name.name);
+ parent->d_name.name, dentry->d_name.name);
}
if (fhp->fh_maxsize < NFS_FHSIZE)
printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n",
- fhp->fh_maxsize, parent->d_name.name, dentry->d_name.name);
+ fhp->fh_maxsize,
+ parent->d_name.name, dentry->d_name.name);
fhp->fh_dentry = dget(dentry); /* our internal copy */
fhp->fh_export = exp;
cache_get(&exp->h);
- if (ref_fh_version == 0xca) {
+ if (version == 0xca) {
/* old style filehandle please */
memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
fhp->fh_handle.fh_size = NFS_FHSIZE;
fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev);
fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
- fhp->fh_handle.ofh_xino = ino_t_to_u32(exp->ex_dentry->d_inode->i_ino);
+ fhp->fh_handle.ofh_xino =
+ ino_t_to_u32(exp->ex_dentry->d_inode->i_ino);
fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
if (inode)
_fh_update_old(dentry, exp, &fhp->fh_handle);
@@ -399,38 +395,38 @@ fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, st
fhp->fh_handle.fh_version = 1;
fhp->fh_handle.fh_auth_type = 0;
datap = fhp->fh_handle.fh_auth+0;
- fhp->fh_handle.fh_fsid_type = ref_fh_fsid_type;
- switch (ref_fh_fsid_type) {
- case 0:
- /*
- * fsid_type 0:
- * 2byte major, 2byte minor, 4byte inode
- */
- mk_fsid_v0(datap, ex_dev,
- exp->ex_dentry->d_inode->i_ino);
- break;
- case 1:
- /* fsid_type 1 == 4 bytes filesystem id */
- mk_fsid_v1(datap, exp->ex_fsid);
- break;
- case 2:
- /*
- * fsid_type 2:
- * 4byte major, 4byte minor, 4byte inode
- */
- mk_fsid_v2(datap, ex_dev,
- exp->ex_dentry->d_inode->i_ino);
- break;
- case 3:
- /*
- * fsid_type 3:
- * 4byte devicenumber, 4byte inode
- */
- mk_fsid_v3(datap, ex_dev,
- exp->ex_dentry->d_inode->i_ino);
- break;
+ fhp->fh_handle.fh_fsid_type = fsid_type;
+ switch (fsid_type) {
+ case 0:
+ /*
+ * fsid_type 0:
+ * 2byte major, 2byte minor, 4byte inode
+ */
+ mk_fsid_v0(datap, ex_dev,
+ exp->ex_dentry->d_inode->i_ino);
+ break;
+ case 1:
+ /* fsid_type 1 == 4 bytes filesystem id */
+ mk_fsid_v1(datap, exp->ex_fsid);
+ break;
+ case 2:
+ /*
+ * fsid_type 2:
+ * 4byte major, 4byte minor, 4byte inode
+ */
+ mk_fsid_v2(datap, ex_dev,
+ exp->ex_dentry->d_inode->i_ino);
+ break;
+ case 3:
+ /*
+ * fsid_type 3:
+ * 4byte devicenumber, 4byte inode
+ */
+ mk_fsid_v3(datap, ex_dev,
+ exp->ex_dentry->d_inode->i_ino);
+ break;
}
- len = key_len(ref_fh_fsid_type);
+ len = key_len(fsid_type);
datap += len/4;
fhp->fh_handle.fh_size = 4 + len;
@@ -457,7 +453,7 @@ fh_update(struct svc_fh *fhp)
{
struct dentry *dentry;
__u32 *datap;
-
+
if (!fhp->fh_dentry)
goto out_bad;
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-30 07:29:35 +0000