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NFS: Add a boot parameter to disable 64 bit inode numbers

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This boot parameter will allow legacy 32-bit applications which call stat()
to continue to function even if the NFSv3/v4 server uses 64-bit inode
numbers.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2007-10-09 12:01:04 -04:00
parent 2a3f5fd459
commit f43bf0bebe
4 changed files with 36 additions and 2 deletions
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7
Documentation/kernel-parameters.txt
View file

@ -1073,6 +1073,13 @@ and is between 256 and 4096 characters. It is defined in the file
[NFS] set the maximum lifetime for idmapper cache
entries.
nfs.enable_ino64=
[NFS] enable 64-bit inode numbers.
If zero, the NFS client will fake up a 32-bit inode
number for the readdir() and stat() syscalls instead
of returning the full 64-bit number.
The default is to return 64-bit inode numbers.
nmi_watchdog= [KNL,BUGS=X86-32] Debugging features for SMP kernels
no387 [BUGS=X86-32] Tells the kernel to use the 387 maths

3
fs/nfs/dir.c
View file

@ -427,7 +427,8 @@ int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent,
}
res = filldir(dirent, entry->name, entry->len,
file->f_pos, fileid, d_type);
file->f_pos, nfs_compat_user_ino64(fileid),
d_type);
if (res < 0)
break;
file->f_pos++;

27
fs/nfs/inode.c
View file

@ -49,6 +49,11 @@
#define NFSDBG_FACILITY NFSDBG_VFS
#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
/* Default is to see 64-bit inode numbers */
static int enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
static void nfs_invalidate_inode(struct inode *);
static int nfs_update_inode(struct inode *, struct nfs_fattr *);
@ -62,6 +67,25 @@ nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
return nfs_fileid_to_ino_t(fattr->fileid);
}
/**
* nfs_compat_user_ino64 - returns the user-visible inode number
* @fileid: 64-bit fileid
*
* This function returns a 32-bit inode number if the boot parameter
* nfs.enable_ino64 is zero.
*/
u64 nfs_compat_user_ino64(u64 fileid)
{
int ino;
if (enable_ino64)
return fileid;
ino = fileid;
if (sizeof(ino) < sizeof(fileid))
ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
return ino;
}
int nfs_write_inode(struct inode *inode, int sync)
{
int ret;
@ -456,7 +480,7 @@ int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
if (!err) {
generic_fillattr(inode, stat);
stat->ino = NFS_FILEID(inode);
stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
}
return err;
}
@ -1235,6 +1259,7 @@ static void __exit exit_nfs_fs(void)
/* Not quite true; I just maintain it */
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
MODULE_LICENSE("GPL");
module_param(enable_ino64, bool, 0644);
module_init(init_nfs_fs)
module_exit(exit_nfs_fs)

1
include/linux/nfs_fs.h
View file

@ -289,6 +289,7 @@ extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
extern void put_nfs_open_context(struct nfs_open_context *ctx);
extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
extern u64 nfs_compat_user_ino64(u64 fileid);
/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
extern __be32 root_nfs_parse_addr(char *name); /*__init*/