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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2007-10-09 20:01:04 +0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2007-10-10 01:20:52 +0400 |
| commit | f43bf0bebed7c33b698a8a25f95812f9e87c3843 (patch) | |
| tree | 20c527153cde564ca3517cf6f214fa32727542bb /fs/nfs/inode.c | |
| parent | 2a3f5fd45938bd86ce8faf4cb26be4f7e9ae2941 (diff) | |
| download | linux-f43bf0bebed7c33b698a8a25f95812f9e87c3843.tar.xz | |
NFS: Add a boot parameter to disable 64 bit inode numbers
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>
Diffstat (limited to 'fs/nfs/inode.c')
| -rw-r--r-- | fs/nfs/inode.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index cad1246bf575..035c769b715e 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -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) |