2365 lines
63 KiB
C
2365 lines
63 KiB
C
/*
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* linux/fs/nfs/inode.c
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*
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* Copyright (C) 1992 Rick Sladkey
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*
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* nfs inode and superblock handling functions
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*
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* Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
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* experimental NFS changes. Modularisation taken straight from SYS5 fs.
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*
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* Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
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* J.S.Peatfield@damtp.cam.ac.uk
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*
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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#include <linux/errno.h>
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#include <linux/unistd.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/stats.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_mount.h>
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#include <linux/nfs4_mount.h>
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#include <linux/lockd/bind.h>
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#include <linux/smp_lock.h>
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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#include <linux/nfs_idmap.h>
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#include <linux/vfs.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include "nfs4_fs.h"
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#include "callback.h"
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#include "delegation.h"
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#include "iostat.h"
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#define NFSDBG_FACILITY NFSDBG_VFS
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#define NFS_PARANOIA 1
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/* Maximum number of readahead requests
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* FIXME: this should really be a sysctl so that users may tune it to suit
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* their needs. People that do NFS over a slow network, might for
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* instance want to reduce it to something closer to 1 for improved
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* interactive response.
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*/
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#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
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static void nfs_invalidate_inode(struct inode *);
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static int nfs_update_inode(struct inode *, struct nfs_fattr *);
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static struct inode *nfs_alloc_inode(struct super_block *sb);
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static void nfs_destroy_inode(struct inode *);
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static int nfs_write_inode(struct inode *,int);
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static void nfs_delete_inode(struct inode *);
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static void nfs_clear_inode(struct inode *);
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static void nfs_umount_begin(struct super_block *);
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static int nfs_statfs(struct super_block *, struct kstatfs *);
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static int nfs_show_options(struct seq_file *, struct vfsmount *);
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static int nfs_show_stats(struct seq_file *, struct vfsmount *);
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static void nfs_zap_acl_cache(struct inode *);
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static struct rpc_program nfs_program;
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static struct super_operations nfs_sops = {
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.alloc_inode = nfs_alloc_inode,
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.destroy_inode = nfs_destroy_inode,
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.write_inode = nfs_write_inode,
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.delete_inode = nfs_delete_inode,
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.statfs = nfs_statfs,
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.clear_inode = nfs_clear_inode,
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.umount_begin = nfs_umount_begin,
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.show_options = nfs_show_options,
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.show_stats = nfs_show_stats,
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};
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/*
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* RPC cruft for NFS
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*/
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static struct rpc_stat nfs_rpcstat = {
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.program = &nfs_program
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};
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static struct rpc_version * nfs_version[] = {
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NULL,
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NULL,
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&nfs_version2,
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#if defined(CONFIG_NFS_V3)
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&nfs_version3,
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#elif defined(CONFIG_NFS_V4)
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NULL,
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#endif
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#if defined(CONFIG_NFS_V4)
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&nfs_version4,
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#endif
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};
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static struct rpc_program nfs_program = {
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.name = "nfs",
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.number = NFS_PROGRAM,
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.nrvers = sizeof(nfs_version) / sizeof(nfs_version[0]),
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.version = nfs_version,
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.stats = &nfs_rpcstat,
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.pipe_dir_name = "/nfs",
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};
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#ifdef CONFIG_NFS_V3_ACL
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static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
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static struct rpc_version * nfsacl_version[] = {
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[3] = &nfsacl_version3,
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};
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struct rpc_program nfsacl_program = {
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.name = "nfsacl",
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.number = NFS_ACL_PROGRAM,
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.nrvers = sizeof(nfsacl_version) / sizeof(nfsacl_version[0]),
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.version = nfsacl_version,
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.stats = &nfsacl_rpcstat,
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};
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#endif /* CONFIG_NFS_V3_ACL */
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static inline unsigned long
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nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
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{
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return nfs_fileid_to_ino_t(fattr->fileid);
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}
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static int
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nfs_write_inode(struct inode *inode, int sync)
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{
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int flags = sync ? FLUSH_WAIT : 0;
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int ret;
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ret = nfs_commit_inode(inode, flags);
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if (ret < 0)
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return ret;
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return 0;
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}
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static void
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nfs_delete_inode(struct inode * inode)
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{
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dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
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truncate_inode_pages(&inode->i_data, 0);
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nfs_wb_all(inode);
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/*
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* The following should never happen...
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*/
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if (nfs_have_writebacks(inode)) {
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printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
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}
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clear_inode(inode);
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}
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static void
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nfs_clear_inode(struct inode *inode)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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struct rpc_cred *cred;
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nfs_wb_all(inode);
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BUG_ON (!list_empty(&nfsi->open_files));
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nfs_zap_acl_cache(inode);
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cred = nfsi->cache_access.cred;
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if (cred)
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put_rpccred(cred);
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BUG_ON(atomic_read(&nfsi->data_updates) != 0);
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}
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void
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nfs_umount_begin(struct super_block *sb)
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{
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struct rpc_clnt *rpc = NFS_SB(sb)->client;
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/* -EIO all pending I/O */
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if (!IS_ERR(rpc))
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rpc_killall_tasks(rpc);
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rpc = NFS_SB(sb)->client_acl;
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if (!IS_ERR(rpc))
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rpc_killall_tasks(rpc);
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}
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static inline unsigned long
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nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
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{
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/* make sure blocksize is a power of two */
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if ((bsize & (bsize - 1)) || nrbitsp) {
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unsigned char nrbits;
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for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
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;
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bsize = 1 << nrbits;
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if (nrbitsp)
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*nrbitsp = nrbits;
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}
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return bsize;
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}
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/*
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* Calculate the number of 512byte blocks used.
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*/
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static inline unsigned long
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nfs_calc_block_size(u64 tsize)
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{
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loff_t used = (tsize + 511) >> 9;
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return (used > ULONG_MAX) ? ULONG_MAX : used;
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}
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/*
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* Compute and set NFS server blocksize
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*/
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static inline unsigned long
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nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
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{
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if (bsize < NFS_MIN_FILE_IO_SIZE)
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bsize = NFS_DEF_FILE_IO_SIZE;
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else if (bsize >= NFS_MAX_FILE_IO_SIZE)
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bsize = NFS_MAX_FILE_IO_SIZE;
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return nfs_block_bits(bsize, nrbitsp);
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}
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/*
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* Obtain the root inode of the file system.
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*/
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static struct inode *
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nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
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{
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struct nfs_server *server = NFS_SB(sb);
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struct inode *rooti;
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int error;
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error = server->rpc_ops->getroot(server, rootfh, fsinfo);
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if (error < 0) {
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dprintk("nfs_get_root: getattr error = %d\n", -error);
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return ERR_PTR(error);
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}
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rooti = nfs_fhget(sb, rootfh, fsinfo->fattr);
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if (!rooti)
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return ERR_PTR(-ENOMEM);
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return rooti;
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}
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/*
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* Do NFS version-independent mount processing, and sanity checking
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*/
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static int
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nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
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{
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struct nfs_server *server;
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struct inode *root_inode;
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struct nfs_fattr fattr;
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struct nfs_fsinfo fsinfo = {
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.fattr = &fattr,
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};
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struct nfs_pathconf pathinfo = {
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.fattr = &fattr,
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};
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int no_root_error = 0;
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unsigned long max_rpc_payload;
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/* We probably want something more informative here */
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snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
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server = NFS_SB(sb);
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sb->s_magic = NFS_SUPER_MAGIC;
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root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
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/* Did getting the root inode fail? */
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if (IS_ERR(root_inode)) {
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no_root_error = PTR_ERR(root_inode);
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goto out_no_root;
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}
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sb->s_root = d_alloc_root(root_inode);
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if (!sb->s_root) {
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no_root_error = -ENOMEM;
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goto out_no_root;
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}
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sb->s_root->d_op = server->rpc_ops->dentry_ops;
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server->io_stats = nfs_alloc_iostats();
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if (!server->io_stats) {
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no_root_error = -ENOMEM;
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goto out_no_root;
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}
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/* Get some general file system info */
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if (server->namelen == 0 &&
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server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
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server->namelen = pathinfo.max_namelen;
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/* Work out a lot of parameters */
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if (server->rsize == 0)
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server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
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if (server->wsize == 0)
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server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
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if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
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server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
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if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
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server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
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max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
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if (server->rsize > max_rpc_payload)
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server->rsize = max_rpc_payload;
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if (server->rsize > NFS_MAX_FILE_IO_SIZE)
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server->rsize = NFS_MAX_FILE_IO_SIZE;
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server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
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if (server->wsize > max_rpc_payload)
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server->wsize = max_rpc_payload;
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if (server->wsize > NFS_MAX_FILE_IO_SIZE)
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server->wsize = NFS_MAX_FILE_IO_SIZE;
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server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
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if (sb->s_blocksize == 0)
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sb->s_blocksize = nfs_block_bits(server->wsize,
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&sb->s_blocksize_bits);
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server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
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server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
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if (server->dtsize > PAGE_CACHE_SIZE)
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server->dtsize = PAGE_CACHE_SIZE;
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if (server->dtsize > server->rsize)
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server->dtsize = server->rsize;
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if (server->flags & NFS_MOUNT_NOAC) {
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server->acregmin = server->acregmax = 0;
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server->acdirmin = server->acdirmax = 0;
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sb->s_flags |= MS_SYNCHRONOUS;
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}
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server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
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sb->s_maxbytes = fsinfo.maxfilesize;
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if (sb->s_maxbytes > MAX_LFS_FILESIZE)
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
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server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
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/* We're airborne Set socket buffersize */
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rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
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return 0;
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/* Yargs. It didn't work out. */
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out_no_root:
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dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
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if (!IS_ERR(root_inode))
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iput(root_inode);
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return no_root_error;
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}
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static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans)
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{
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to->to_initval = timeo * HZ / 10;
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to->to_retries = retrans;
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if (!to->to_retries)
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to->to_retries = 2;
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|
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switch (proto) {
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case IPPROTO_TCP:
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if (!to->to_initval)
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to->to_initval = 60 * HZ;
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if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
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to->to_initval = NFS_MAX_TCP_TIMEOUT;
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to->to_increment = to->to_initval;
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to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
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to->to_exponential = 0;
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break;
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case IPPROTO_UDP:
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default:
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if (!to->to_initval)
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to->to_initval = 11 * HZ / 10;
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if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
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to->to_initval = NFS_MAX_UDP_TIMEOUT;
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to->to_maxval = NFS_MAX_UDP_TIMEOUT;
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to->to_exponential = 1;
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break;
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}
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}
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|
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/*
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* Create an RPC client handle.
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*/
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static struct rpc_clnt *
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nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
|
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{
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struct rpc_timeout timeparms;
|
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struct rpc_xprt *xprt = NULL;
|
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struct rpc_clnt *clnt = NULL;
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int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
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|
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nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans);
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|
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server->retrans_timeo = timeparms.to_initval;
|
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server->retrans_count = timeparms.to_retries;
|
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|
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/* create transport and client */
|
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xprt = xprt_create_proto(proto, &server->addr, &timeparms);
|
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if (IS_ERR(xprt)) {
|
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dprintk("%s: cannot create RPC transport. Error = %ld\n",
|
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__FUNCTION__, PTR_ERR(xprt));
|
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return (struct rpc_clnt *)xprt;
|
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}
|
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clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
|
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server->rpc_ops->version, data->pseudoflavor);
|
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if (IS_ERR(clnt)) {
|
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dprintk("%s: cannot create RPC client. Error = %ld\n",
|
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__FUNCTION__, PTR_ERR(xprt));
|
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goto out_fail;
|
|
}
|
|
|
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clnt->cl_intr = 1;
|
|
clnt->cl_softrtry = 1;
|
|
|
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return clnt;
|
|
|
|
out_fail:
|
|
return clnt;
|
|
}
|
|
|
|
/*
|
|
* The way this works is that the mount process passes a structure
|
|
* in the data argument which contains the server's IP address
|
|
* and the root file handle obtained from the server's mount
|
|
* daemon. We stash these away in the private superblock fields.
|
|
*/
|
|
static int
|
|
nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
|
|
{
|
|
struct nfs_server *server;
|
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rpc_authflavor_t authflavor;
|
|
|
|
server = NFS_SB(sb);
|
|
sb->s_blocksize_bits = 0;
|
|
sb->s_blocksize = 0;
|
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if (data->bsize)
|
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sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
|
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if (data->rsize)
|
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server->rsize = nfs_block_size(data->rsize, NULL);
|
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if (data->wsize)
|
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server->wsize = nfs_block_size(data->wsize, NULL);
|
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server->flags = data->flags & NFS_MOUNT_FLAGMASK;
|
|
|
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server->acregmin = data->acregmin*HZ;
|
|
server->acregmax = data->acregmax*HZ;
|
|
server->acdirmin = data->acdirmin*HZ;
|
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server->acdirmax = data->acdirmax*HZ;
|
|
|
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/* Start lockd here, before we might error out */
|
|
if (!(server->flags & NFS_MOUNT_NONLM))
|
|
lockd_up();
|
|
|
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server->namelen = data->namlen;
|
|
server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
|
|
if (!server->hostname)
|
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return -ENOMEM;
|
|
strcpy(server->hostname, data->hostname);
|
|
|
|
/* Check NFS protocol revision and initialize RPC op vector
|
|
* and file handle pool. */
|
|
#ifdef CONFIG_NFS_V3
|
|
if (server->flags & NFS_MOUNT_VER3) {
|
|
server->rpc_ops = &nfs_v3_clientops;
|
|
server->caps |= NFS_CAP_READDIRPLUS;
|
|
} else {
|
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server->rpc_ops = &nfs_v2_clientops;
|
|
}
|
|
#else
|
|
server->rpc_ops = &nfs_v2_clientops;
|
|
#endif
|
|
|
|
/* Fill in pseudoflavor for mount version < 5 */
|
|
if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
|
|
data->pseudoflavor = RPC_AUTH_UNIX;
|
|
authflavor = data->pseudoflavor; /* save for sb_init() */
|
|
/* XXX maybe we want to add a server->pseudoflavor field */
|
|
|
|
/* Create RPC client handles */
|
|
server->client = nfs_create_client(server, data);
|
|
if (IS_ERR(server->client))
|
|
return PTR_ERR(server->client);
|
|
/* RFC 2623, sec 2.3.2 */
|
|
if (authflavor != RPC_AUTH_UNIX) {
|
|
struct rpc_auth *auth;
|
|
|
|
server->client_sys = rpc_clone_client(server->client);
|
|
if (IS_ERR(server->client_sys))
|
|
return PTR_ERR(server->client_sys);
|
|
auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
|
|
if (IS_ERR(auth))
|
|
return PTR_ERR(auth);
|
|
} else {
|
|
atomic_inc(&server->client->cl_count);
|
|
server->client_sys = server->client;
|
|
}
|
|
if (server->flags & NFS_MOUNT_VER3) {
|
|
#ifdef CONFIG_NFS_V3_ACL
|
|
if (!(server->flags & NFS_MOUNT_NOACL)) {
|
|
server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
|
|
/* No errors! Assume that Sun nfsacls are supported */
|
|
if (!IS_ERR(server->client_acl))
|
|
server->caps |= NFS_CAP_ACLS;
|
|
}
|
|
#else
|
|
server->flags &= ~NFS_MOUNT_NOACL;
|
|
#endif /* CONFIG_NFS_V3_ACL */
|
|
/*
|
|
* The VFS shouldn't apply the umask to mode bits. We will
|
|
* do so ourselves when necessary.
|
|
*/
|
|
sb->s_flags |= MS_POSIXACL;
|
|
if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
|
|
server->namelen = NFS3_MAXNAMLEN;
|
|
sb->s_time_gran = 1;
|
|
} else {
|
|
if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
|
|
server->namelen = NFS2_MAXNAMLEN;
|
|
}
|
|
|
|
sb->s_op = &nfs_sops;
|
|
return nfs_sb_init(sb, authflavor);
|
|
}
|
|
|
|
static int
|
|
nfs_statfs(struct super_block *sb, struct kstatfs *buf)
|
|
{
|
|
struct nfs_server *server = NFS_SB(sb);
|
|
unsigned char blockbits;
|
|
unsigned long blockres;
|
|
struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
|
|
struct nfs_fattr fattr;
|
|
struct nfs_fsstat res = {
|
|
.fattr = &fattr,
|
|
};
|
|
int error;
|
|
|
|
lock_kernel();
|
|
|
|
error = server->rpc_ops->statfs(server, rootfh, &res);
|
|
buf->f_type = NFS_SUPER_MAGIC;
|
|
if (error < 0)
|
|
goto out_err;
|
|
|
|
/*
|
|
* Current versions of glibc do not correctly handle the
|
|
* case where f_frsize != f_bsize. Eventually we want to
|
|
* report the value of wtmult in this field.
|
|
*/
|
|
buf->f_frsize = sb->s_blocksize;
|
|
|
|
/*
|
|
* On most *nix systems, f_blocks, f_bfree, and f_bavail
|
|
* are reported in units of f_frsize. Linux hasn't had
|
|
* an f_frsize field in its statfs struct until recently,
|
|
* thus historically Linux's sys_statfs reports these
|
|
* fields in units of f_bsize.
|
|
*/
|
|
buf->f_bsize = sb->s_blocksize;
|
|
blockbits = sb->s_blocksize_bits;
|
|
blockres = (1 << blockbits) - 1;
|
|
buf->f_blocks = (res.tbytes + blockres) >> blockbits;
|
|
buf->f_bfree = (res.fbytes + blockres) >> blockbits;
|
|
buf->f_bavail = (res.abytes + blockres) >> blockbits;
|
|
|
|
buf->f_files = res.tfiles;
|
|
buf->f_ffree = res.afiles;
|
|
|
|
buf->f_namelen = server->namelen;
|
|
out:
|
|
unlock_kernel();
|
|
return 0;
|
|
|
|
out_err:
|
|
dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
|
|
buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
|
|
goto out;
|
|
|
|
}
|
|
|
|
static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
|
|
{
|
|
static struct proc_nfs_info {
|
|
int flag;
|
|
char *str;
|
|
char *nostr;
|
|
} nfs_info[] = {
|
|
{ NFS_MOUNT_SOFT, ",soft", ",hard" },
|
|
{ NFS_MOUNT_INTR, ",intr", "" },
|
|
{ NFS_MOUNT_NOCTO, ",nocto", "" },
|
|
{ NFS_MOUNT_NOAC, ",noac", "" },
|
|
{ NFS_MOUNT_NONLM, ",nolock", "" },
|
|
{ NFS_MOUNT_NOACL, ",noacl", "" },
|
|
{ 0, NULL, NULL }
|
|
};
|
|
struct proc_nfs_info *nfs_infop;
|
|
char buf[12];
|
|
char *proto;
|
|
|
|
seq_printf(m, ",vers=%d", nfss->rpc_ops->version);
|
|
seq_printf(m, ",rsize=%d", nfss->rsize);
|
|
seq_printf(m, ",wsize=%d", nfss->wsize);
|
|
if (nfss->acregmin != 3*HZ || showdefaults)
|
|
seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
|
|
if (nfss->acregmax != 60*HZ || showdefaults)
|
|
seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
|
|
if (nfss->acdirmin != 30*HZ || showdefaults)
|
|
seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
|
|
if (nfss->acdirmax != 60*HZ || showdefaults)
|
|
seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
|
|
for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
|
|
if (nfss->flags & nfs_infop->flag)
|
|
seq_puts(m, nfs_infop->str);
|
|
else
|
|
seq_puts(m, nfs_infop->nostr);
|
|
}
|
|
switch (nfss->client->cl_xprt->prot) {
|
|
case IPPROTO_TCP:
|
|
proto = "tcp";
|
|
break;
|
|
case IPPROTO_UDP:
|
|
proto = "udp";
|
|
break;
|
|
default:
|
|
snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
|
|
proto = buf;
|
|
}
|
|
seq_printf(m, ",proto=%s", proto);
|
|
seq_printf(m, ",timeo=%lu", 10U * nfss->retrans_timeo / HZ);
|
|
seq_printf(m, ",retrans=%u", nfss->retrans_count);
|
|
}
|
|
|
|
static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
|
|
{
|
|
struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
|
|
|
|
nfs_show_mount_options(m, nfss, 0);
|
|
|
|
seq_puts(m, ",addr=");
|
|
seq_escape(m, nfss->hostname, " \t\n\\");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
|
|
{
|
|
int i, cpu;
|
|
struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
|
|
struct rpc_auth *auth = nfss->client->cl_auth;
|
|
struct nfs_iostats totals = { };
|
|
|
|
seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
|
|
|
|
/*
|
|
* Display all mount option settings
|
|
*/
|
|
seq_printf(m, "\n\topts:\t");
|
|
seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
|
|
seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
|
|
seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
|
|
seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
|
|
nfs_show_mount_options(m, nfss, 1);
|
|
|
|
seq_printf(m, "\n\tcaps:\t");
|
|
seq_printf(m, "caps=0x%x", nfss->caps);
|
|
seq_printf(m, ",wtmult=%d", nfss->wtmult);
|
|
seq_printf(m, ",dtsize=%d", nfss->dtsize);
|
|
seq_printf(m, ",bsize=%d", nfss->bsize);
|
|
seq_printf(m, ",namelen=%d", nfss->namelen);
|
|
|
|
#ifdef CONFIG_NFS_V4
|
|
if (nfss->rpc_ops->version == 4) {
|
|
seq_printf(m, "\n\tnfsv4:\t");
|
|
seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
|
|
seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
|
|
seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Display security flavor in effect for this mount
|
|
*/
|
|
seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
|
|
if (auth->au_flavor)
|
|
seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
|
|
|
|
/*
|
|
* Display superblock I/O counters
|
|
*/
|
|
for (cpu = 0; cpu < NR_CPUS; cpu++) {
|
|
struct nfs_iostats *stats;
|
|
|
|
if (!cpu_possible(cpu))
|
|
continue;
|
|
|
|
preempt_disable();
|
|
stats = per_cpu_ptr(nfss->io_stats, cpu);
|
|
|
|
for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
|
|
totals.events[i] += stats->events[i];
|
|
for (i = 0; i < __NFSIOS_BYTESMAX; i++)
|
|
totals.bytes[i] += stats->bytes[i];
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
seq_printf(m, "\n\tevents:\t");
|
|
for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
|
|
seq_printf(m, "%lu ", totals.events[i]);
|
|
seq_printf(m, "\n\tbytes:\t");
|
|
for (i = 0; i < __NFSIOS_BYTESMAX; i++)
|
|
seq_printf(m, "%Lu ", totals.bytes[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nfs_sync_mapping - helper to flush all mmapped dirty data to disk
|
|
*/
|
|
int nfs_sync_mapping(struct address_space *mapping)
|
|
{
|
|
int ret;
|
|
|
|
if (mapping->nrpages == 0)
|
|
return 0;
|
|
unmap_mapping_range(mapping, 0, 0, 0);
|
|
ret = filemap_write_and_wait(mapping);
|
|
if (ret != 0)
|
|
goto out;
|
|
ret = nfs_wb_all(mapping->host);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Invalidate the local caches
|
|
*/
|
|
static void nfs_zap_caches_locked(struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
int mode = inode->i_mode;
|
|
|
|
nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
|
|
|
|
NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
|
|
NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
|
|
|
|
memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
|
|
if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
|
|
nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
|
|
else
|
|
nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
|
|
}
|
|
|
|
void nfs_zap_caches(struct inode *inode)
|
|
{
|
|
spin_lock(&inode->i_lock);
|
|
nfs_zap_caches_locked(inode);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
static void nfs_zap_acl_cache(struct inode *inode)
|
|
{
|
|
void (*clear_acl_cache)(struct inode *);
|
|
|
|
clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
|
|
if (clear_acl_cache != NULL)
|
|
clear_acl_cache(inode);
|
|
spin_lock(&inode->i_lock);
|
|
NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
/*
|
|
* Invalidate, but do not unhash, the inode.
|
|
* NB: must be called with inode->i_lock held!
|
|
*/
|
|
static void nfs_invalidate_inode(struct inode *inode)
|
|
{
|
|
set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
|
|
nfs_zap_caches_locked(inode);
|
|
}
|
|
|
|
struct nfs_find_desc {
|
|
struct nfs_fh *fh;
|
|
struct nfs_fattr *fattr;
|
|
};
|
|
|
|
/*
|
|
* In NFSv3 we can have 64bit inode numbers. In order to support
|
|
* this, and re-exported directories (also seen in NFSv2)
|
|
* we are forced to allow 2 different inodes to have the same
|
|
* i_ino.
|
|
*/
|
|
static int
|
|
nfs_find_actor(struct inode *inode, void *opaque)
|
|
{
|
|
struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
|
|
struct nfs_fh *fh = desc->fh;
|
|
struct nfs_fattr *fattr = desc->fattr;
|
|
|
|
if (NFS_FILEID(inode) != fattr->fileid)
|
|
return 0;
|
|
if (nfs_compare_fh(NFS_FH(inode), fh))
|
|
return 0;
|
|
if (is_bad_inode(inode) || NFS_STALE(inode))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
nfs_init_locked(struct inode *inode, void *opaque)
|
|
{
|
|
struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
|
|
struct nfs_fattr *fattr = desc->fattr;
|
|
|
|
NFS_FILEID(inode) = fattr->fileid;
|
|
nfs_copy_fh(NFS_FH(inode), desc->fh);
|
|
return 0;
|
|
}
|
|
|
|
/* Don't use READDIRPLUS on directories that we believe are too large */
|
|
#define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
|
|
|
|
/*
|
|
* This is our front-end to iget that looks up inodes by file handle
|
|
* instead of inode number.
|
|
*/
|
|
struct inode *
|
|
nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_find_desc desc = {
|
|
.fh = fh,
|
|
.fattr = fattr
|
|
};
|
|
struct inode *inode = NULL;
|
|
unsigned long hash;
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
|
|
goto out_no_inode;
|
|
|
|
if (!fattr->nlink) {
|
|
printk("NFS: Buggy server - nlink == 0!\n");
|
|
goto out_no_inode;
|
|
}
|
|
|
|
hash = nfs_fattr_to_ino_t(fattr);
|
|
|
|
if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
|
|
goto out_no_inode;
|
|
|
|
if (inode->i_state & I_NEW) {
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
/* We set i_ino for the few things that still rely on it,
|
|
* such as stat(2) */
|
|
inode->i_ino = hash;
|
|
|
|
/* We can't support update_atime(), since the server will reset it */
|
|
inode->i_flags |= S_NOATIME|S_NOCMTIME;
|
|
inode->i_mode = fattr->mode;
|
|
/* Why so? Because we want revalidate for devices/FIFOs, and
|
|
* that's precisely what we have in nfs_file_inode_operations.
|
|
*/
|
|
inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
|
|
if (S_ISREG(inode->i_mode)) {
|
|
inode->i_fop = &nfs_file_operations;
|
|
inode->i_data.a_ops = &nfs_file_aops;
|
|
inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
|
|
} else if (S_ISDIR(inode->i_mode)) {
|
|
inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
|
|
inode->i_fop = &nfs_dir_operations;
|
|
if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
|
|
&& fattr->size <= NFS_LIMIT_READDIRPLUS)
|
|
set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
|
|
} else if (S_ISLNK(inode->i_mode))
|
|
inode->i_op = &nfs_symlink_inode_operations;
|
|
else
|
|
init_special_inode(inode, inode->i_mode, fattr->rdev);
|
|
|
|
nfsi->read_cache_jiffies = fattr->time_start;
|
|
nfsi->last_updated = jiffies;
|
|
inode->i_atime = fattr->atime;
|
|
inode->i_mtime = fattr->mtime;
|
|
inode->i_ctime = fattr->ctime;
|
|
if (fattr->valid & NFS_ATTR_FATTR_V4)
|
|
nfsi->change_attr = fattr->change_attr;
|
|
inode->i_size = nfs_size_to_loff_t(fattr->size);
|
|
inode->i_nlink = fattr->nlink;
|
|
inode->i_uid = fattr->uid;
|
|
inode->i_gid = fattr->gid;
|
|
if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
|
|
/*
|
|
* report the blocks in 512byte units
|
|
*/
|
|
inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
|
|
inode->i_blksize = inode->i_sb->s_blocksize;
|
|
} else {
|
|
inode->i_blocks = fattr->du.nfs2.blocks;
|
|
inode->i_blksize = fattr->du.nfs2.blocksize;
|
|
}
|
|
nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
|
|
nfsi->attrtimeo_timestamp = jiffies;
|
|
memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
|
|
nfsi->cache_access.cred = NULL;
|
|
|
|
unlock_new_inode(inode);
|
|
} else
|
|
nfs_refresh_inode(inode, fattr);
|
|
dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
|
|
inode->i_sb->s_id,
|
|
(long long)NFS_FILEID(inode),
|
|
atomic_read(&inode->i_count));
|
|
|
|
out:
|
|
return inode;
|
|
|
|
out_no_inode:
|
|
printk("nfs_fhget: iget failed\n");
|
|
goto out;
|
|
}
|
|
|
|
#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
|
|
|
|
int
|
|
nfs_setattr(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct nfs_fattr fattr;
|
|
int error;
|
|
|
|
nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
|
|
|
|
if (attr->ia_valid & ATTR_SIZE) {
|
|
if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
|
|
attr->ia_valid &= ~ATTR_SIZE;
|
|
}
|
|
|
|
/* Optimization: if the end result is no change, don't RPC */
|
|
attr->ia_valid &= NFS_VALID_ATTRS;
|
|
if (attr->ia_valid == 0)
|
|
return 0;
|
|
|
|
lock_kernel();
|
|
nfs_begin_data_update(inode);
|
|
/* Write all dirty data */
|
|
filemap_write_and_wait(inode->i_mapping);
|
|
nfs_wb_all(inode);
|
|
/*
|
|
* Return any delegations if we're going to change ACLs
|
|
*/
|
|
if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
|
|
nfs_inode_return_delegation(inode);
|
|
error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
|
|
if (error == 0)
|
|
nfs_refresh_inode(inode, &fattr);
|
|
nfs_end_data_update(inode);
|
|
unlock_kernel();
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* nfs_setattr_update_inode - Update inode metadata after a setattr call.
|
|
* @inode: pointer to struct inode
|
|
* @attr: pointer to struct iattr
|
|
*
|
|
* Note: we do this in the *proc.c in order to ensure that
|
|
* it works for things like exclusive creates too.
|
|
*/
|
|
void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
|
|
{
|
|
if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
|
|
if ((attr->ia_valid & ATTR_MODE) != 0) {
|
|
int mode = attr->ia_mode & S_IALLUGO;
|
|
mode |= inode->i_mode & ~S_IALLUGO;
|
|
inode->i_mode = mode;
|
|
}
|
|
if ((attr->ia_valid & ATTR_UID) != 0)
|
|
inode->i_uid = attr->ia_uid;
|
|
if ((attr->ia_valid & ATTR_GID) != 0)
|
|
inode->i_gid = attr->ia_gid;
|
|
spin_lock(&inode->i_lock);
|
|
NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
if ((attr->ia_valid & ATTR_SIZE) != 0) {
|
|
nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
|
|
inode->i_size = attr->ia_size;
|
|
vmtruncate(inode, attr->ia_size);
|
|
}
|
|
}
|
|
|
|
static int nfs_wait_schedule(void *word)
|
|
{
|
|
if (signal_pending(current))
|
|
return -ERESTARTSYS;
|
|
schedule();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Wait for the inode to get unlocked.
|
|
*/
|
|
static int nfs_wait_on_inode(struct inode *inode)
|
|
{
|
|
struct rpc_clnt *clnt = NFS_CLIENT(inode);
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
sigset_t oldmask;
|
|
int error;
|
|
|
|
rpc_clnt_sigmask(clnt, &oldmask);
|
|
error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
|
|
nfs_wait_schedule, TASK_INTERRUPTIBLE);
|
|
rpc_clnt_sigunmask(clnt, &oldmask);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void nfs_wake_up_inode(struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
|
|
smp_mb__after_clear_bit();
|
|
wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
|
|
}
|
|
|
|
int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
|
|
int err;
|
|
|
|
/* Flush out writes to the server in order to update c/mtime */
|
|
nfs_sync_inode(inode, 0, 0, FLUSH_WAIT|FLUSH_NOCOMMIT);
|
|
|
|
/*
|
|
* We may force a getattr if the user cares about atime.
|
|
*
|
|
* Note that we only have to check the vfsmount flags here:
|
|
* - NFS always sets S_NOATIME by so checking it would give a
|
|
* bogus result
|
|
* - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
|
|
* no point in checking those.
|
|
*/
|
|
if ((mnt->mnt_flags & MNT_NOATIME) ||
|
|
((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
|
|
need_atime = 0;
|
|
|
|
if (need_atime)
|
|
err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
|
|
else
|
|
err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
|
|
if (!err)
|
|
generic_fillattr(inode, stat);
|
|
return err;
|
|
}
|
|
|
|
static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred)
|
|
{
|
|
struct nfs_open_context *ctx;
|
|
|
|
ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
|
|
if (ctx != NULL) {
|
|
atomic_set(&ctx->count, 1);
|
|
ctx->dentry = dget(dentry);
|
|
ctx->vfsmnt = mntget(mnt);
|
|
ctx->cred = get_rpccred(cred);
|
|
ctx->state = NULL;
|
|
ctx->lockowner = current->files;
|
|
ctx->error = 0;
|
|
ctx->dir_cookie = 0;
|
|
}
|
|
return ctx;
|
|
}
|
|
|
|
struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
|
|
{
|
|
if (ctx != NULL)
|
|
atomic_inc(&ctx->count);
|
|
return ctx;
|
|
}
|
|
|
|
void put_nfs_open_context(struct nfs_open_context *ctx)
|
|
{
|
|
if (atomic_dec_and_test(&ctx->count)) {
|
|
if (!list_empty(&ctx->list)) {
|
|
struct inode *inode = ctx->dentry->d_inode;
|
|
spin_lock(&inode->i_lock);
|
|
list_del(&ctx->list);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
if (ctx->state != NULL)
|
|
nfs4_close_state(ctx->state, ctx->mode);
|
|
if (ctx->cred != NULL)
|
|
put_rpccred(ctx->cred);
|
|
dput(ctx->dentry);
|
|
mntput(ctx->vfsmnt);
|
|
kfree(ctx);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Ensure that mmap has a recent RPC credential for use when writing out
|
|
* shared pages
|
|
*/
|
|
static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
|
|
{
|
|
struct inode *inode = filp->f_dentry->d_inode;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
filp->private_data = get_nfs_open_context(ctx);
|
|
spin_lock(&inode->i_lock);
|
|
list_add(&ctx->list, &nfsi->open_files);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
/*
|
|
* Given an inode, search for an open context with the desired characteristics
|
|
*/
|
|
struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs_open_context *pos, *ctx = NULL;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
list_for_each_entry(pos, &nfsi->open_files, list) {
|
|
if (cred != NULL && pos->cred != cred)
|
|
continue;
|
|
if ((pos->mode & mode) == mode) {
|
|
ctx = get_nfs_open_context(pos);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
return ctx;
|
|
}
|
|
|
|
static void nfs_file_clear_open_context(struct file *filp)
|
|
{
|
|
struct inode *inode = filp->f_dentry->d_inode;
|
|
struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
|
|
|
|
if (ctx) {
|
|
filp->private_data = NULL;
|
|
spin_lock(&inode->i_lock);
|
|
list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
|
|
spin_unlock(&inode->i_lock);
|
|
put_nfs_open_context(ctx);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* These allocate and release file read/write context information.
|
|
*/
|
|
int nfs_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct nfs_open_context *ctx;
|
|
struct rpc_cred *cred;
|
|
|
|
cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
|
|
if (IS_ERR(cred))
|
|
return PTR_ERR(cred);
|
|
ctx = alloc_nfs_open_context(filp->f_vfsmnt, filp->f_dentry, cred);
|
|
put_rpccred(cred);
|
|
if (ctx == NULL)
|
|
return -ENOMEM;
|
|
ctx->mode = filp->f_mode;
|
|
nfs_file_set_open_context(filp, ctx);
|
|
put_nfs_open_context(ctx);
|
|
return 0;
|
|
}
|
|
|
|
int nfs_release(struct inode *inode, struct file *filp)
|
|
{
|
|
nfs_file_clear_open_context(filp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function is called whenever some part of NFS notices that
|
|
* the cached attributes have to be refreshed.
|
|
*/
|
|
int
|
|
__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
|
|
{
|
|
int status = -ESTALE;
|
|
struct nfs_fattr fattr;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
|
|
inode->i_sb->s_id, (long long)NFS_FILEID(inode));
|
|
|
|
lock_kernel();
|
|
if (!inode || is_bad_inode(inode))
|
|
goto out_nowait;
|
|
if (NFS_STALE(inode))
|
|
goto out_nowait;
|
|
|
|
status = nfs_wait_on_inode(inode);
|
|
if (status < 0)
|
|
goto out;
|
|
if (NFS_STALE(inode)) {
|
|
status = -ESTALE;
|
|
/* Do we trust the cached ESTALE? */
|
|
if (NFS_ATTRTIMEO(inode) != 0) {
|
|
if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) {
|
|
/* no */
|
|
} else
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
|
|
if (status != 0) {
|
|
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
|
|
inode->i_sb->s_id,
|
|
(long long)NFS_FILEID(inode), status);
|
|
if (status == -ESTALE) {
|
|
nfs_zap_caches(inode);
|
|
if (!S_ISDIR(inode->i_mode))
|
|
set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
spin_lock(&inode->i_lock);
|
|
status = nfs_update_inode(inode, &fattr);
|
|
if (status) {
|
|
spin_unlock(&inode->i_lock);
|
|
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
|
|
inode->i_sb->s_id,
|
|
(long long)NFS_FILEID(inode), status);
|
|
goto out;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
nfs_revalidate_mapping(inode, inode->i_mapping);
|
|
|
|
if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
|
|
nfs_zap_acl_cache(inode);
|
|
|
|
dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
|
|
inode->i_sb->s_id,
|
|
(long long)NFS_FILEID(inode));
|
|
|
|
out:
|
|
nfs_wake_up_inode(inode);
|
|
|
|
out_nowait:
|
|
unlock_kernel();
|
|
return status;
|
|
}
|
|
|
|
int nfs_attribute_timeout(struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
if (nfs_have_delegation(inode, FMODE_READ))
|
|
return 0;
|
|
return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
|
|
}
|
|
|
|
/**
|
|
* nfs_revalidate_inode - Revalidate the inode attributes
|
|
* @server - pointer to nfs_server struct
|
|
* @inode - pointer to inode struct
|
|
*
|
|
* Updates inode attribute information by retrieving the data from the server.
|
|
*/
|
|
int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
|
|
{
|
|
nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
|
|
if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
|
|
&& !nfs_attribute_timeout(inode))
|
|
return NFS_STALE(inode) ? -ESTALE : 0;
|
|
return __nfs_revalidate_inode(server, inode);
|
|
}
|
|
|
|
/**
|
|
* nfs_revalidate_mapping - Revalidate the pagecache
|
|
* @inode - pointer to host inode
|
|
* @mapping - pointer to mapping
|
|
*/
|
|
void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
|
|
nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
|
|
if (S_ISREG(inode->i_mode))
|
|
nfs_sync_mapping(mapping);
|
|
invalidate_inode_pages2(mapping);
|
|
|
|
spin_lock(&inode->i_lock);
|
|
nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
|
|
/* This ensures we revalidate child dentries */
|
|
nfsi->cache_change_attribute = jiffies;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
|
|
inode->i_sb->s_id,
|
|
(long long)NFS_FILEID(inode));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* nfs_begin_data_update
|
|
* @inode - pointer to inode
|
|
* Declare that a set of operations will update file data on the server
|
|
*/
|
|
void nfs_begin_data_update(struct inode *inode)
|
|
{
|
|
atomic_inc(&NFS_I(inode)->data_updates);
|
|
}
|
|
|
|
/**
|
|
* nfs_end_data_update
|
|
* @inode - pointer to inode
|
|
* Declare end of the operations that will update file data
|
|
* This will mark the inode as immediately needing revalidation
|
|
* of its attribute cache.
|
|
*/
|
|
void nfs_end_data_update(struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
if (!nfs_have_delegation(inode, FMODE_READ)) {
|
|
/* Directories and symlinks: invalidate page cache */
|
|
if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) {
|
|
spin_lock(&inode->i_lock);
|
|
nfsi->cache_validity |= NFS_INO_INVALID_DATA;
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
}
|
|
nfsi->cache_change_attribute = jiffies;
|
|
atomic_dec(&nfsi->data_updates);
|
|
}
|
|
|
|
static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
|
|
&& nfsi->change_attr == fattr->pre_change_attr) {
|
|
nfsi->change_attr = fattr->change_attr;
|
|
nfsi->cache_change_attribute = jiffies;
|
|
}
|
|
|
|
/* If we have atomic WCC data, we may update some attributes */
|
|
if ((fattr->valid & NFS_ATTR_WCC) != 0) {
|
|
if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
|
|
memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
|
|
nfsi->cache_change_attribute = jiffies;
|
|
}
|
|
if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
|
|
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
|
|
nfsi->cache_change_attribute = jiffies;
|
|
}
|
|
if (inode->i_size == fattr->pre_size && nfsi->npages == 0) {
|
|
inode->i_size = fattr->size;
|
|
nfsi->cache_change_attribute = jiffies;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* nfs_check_inode_attributes - verify consistency of the inode attribute cache
|
|
* @inode - pointer to inode
|
|
* @fattr - updated attributes
|
|
*
|
|
* Verifies the attribute cache. If we have just changed the attributes,
|
|
* so that fattr carries weak cache consistency data, then it may
|
|
* also update the ctime/mtime/change_attribute.
|
|
*/
|
|
static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
loff_t cur_size, new_isize;
|
|
int data_unstable;
|
|
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
|
|
return 0;
|
|
|
|
/* Has the inode gone and changed behind our back? */
|
|
if (nfsi->fileid != fattr->fileid
|
|
|| (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
|
|
return -EIO;
|
|
}
|
|
|
|
/* Are we in the process of updating data on the server? */
|
|
data_unstable = nfs_caches_unstable(inode);
|
|
|
|
/* Do atomic weak cache consistency updates */
|
|
nfs_wcc_update_inode(inode, fattr);
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0) {
|
|
if (nfsi->change_attr == fattr->change_attr)
|
|
goto out;
|
|
nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
|
|
if (!data_unstable)
|
|
nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
|
|
}
|
|
|
|
/* Verify a few of the more important attributes */
|
|
if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
|
|
nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
|
|
if (!data_unstable)
|
|
nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
|
|
}
|
|
|
|
cur_size = i_size_read(inode);
|
|
new_isize = nfs_size_to_loff_t(fattr->size);
|
|
if (cur_size != new_isize && nfsi->npages == 0)
|
|
nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
|
|
|
|
/* Have any file permissions changed? */
|
|
if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
|
|
|| inode->i_uid != fattr->uid
|
|
|| inode->i_gid != fattr->gid)
|
|
nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
|
|
|
|
/* Has the link count changed? */
|
|
if (inode->i_nlink != fattr->nlink)
|
|
nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
|
|
|
|
out:
|
|
if (!timespec_equal(&inode->i_atime, &fattr->atime))
|
|
nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
|
|
|
|
nfsi->read_cache_jiffies = fattr->time_start;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nfs_refresh_inode - try to update the inode attribute cache
|
|
* @inode - pointer to inode
|
|
* @fattr - updated attributes
|
|
*
|
|
* Check that an RPC call that returned attributes has not overlapped with
|
|
* other recent updates of the inode metadata, then decide whether it is
|
|
* safe to do a full update of the inode attributes, or whether just to
|
|
* call nfs_check_inode_attributes.
|
|
*/
|
|
int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
int status;
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
|
|
return 0;
|
|
spin_lock(&inode->i_lock);
|
|
nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
|
|
if (time_after(fattr->time_start, nfsi->last_updated))
|
|
status = nfs_update_inode(inode, fattr);
|
|
else
|
|
status = nfs_check_inode_attributes(inode, fattr);
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* nfs_post_op_update_inode - try to update the inode attribute cache
|
|
* @inode - pointer to inode
|
|
* @fattr - updated attributes
|
|
*
|
|
* After an operation that has changed the inode metadata, mark the
|
|
* attribute cache as being invalid, then try to update it.
|
|
*/
|
|
int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
int status = 0;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
|
|
nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
|
|
goto out;
|
|
}
|
|
status = nfs_update_inode(inode, fattr);
|
|
out:
|
|
spin_unlock(&inode->i_lock);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Many nfs protocol calls return the new file attributes after
|
|
* an operation. Here we update the inode to reflect the state
|
|
* of the server's inode.
|
|
*
|
|
* This is a bit tricky because we have to make sure all dirty pages
|
|
* have been sent off to the server before calling invalidate_inode_pages.
|
|
* To make sure no other process adds more write requests while we try
|
|
* our best to flush them, we make them sleep during the attribute refresh.
|
|
*
|
|
* A very similar scenario holds for the dir cache.
|
|
*/
|
|
static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
loff_t cur_isize, new_isize;
|
|
unsigned int invalid = 0;
|
|
int data_stable;
|
|
|
|
dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
|
|
__FUNCTION__, inode->i_sb->s_id, inode->i_ino,
|
|
atomic_read(&inode->i_count), fattr->valid);
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
|
|
return 0;
|
|
|
|
if (nfsi->fileid != fattr->fileid)
|
|
goto out_fileid;
|
|
|
|
/*
|
|
* Make sure the inode's type hasn't changed.
|
|
*/
|
|
if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
|
|
goto out_changed;
|
|
|
|
/*
|
|
* Update the read time so we don't revalidate too often.
|
|
*/
|
|
nfsi->read_cache_jiffies = fattr->time_start;
|
|
nfsi->last_updated = jiffies;
|
|
|
|
/* Are we racing with known updates of the metadata on the server? */
|
|
data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
|
|
if (data_stable)
|
|
nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
|
|
|
|
/* Do atomic weak cache consistency updates */
|
|
nfs_wcc_update_inode(inode, fattr);
|
|
|
|
/* Check if our cached file size is stale */
|
|
new_isize = nfs_size_to_loff_t(fattr->size);
|
|
cur_isize = i_size_read(inode);
|
|
if (new_isize != cur_isize) {
|
|
/* Do we perhaps have any outstanding writes? */
|
|
if (nfsi->npages == 0) {
|
|
/* No, but did we race with nfs_end_data_update()? */
|
|
if (data_stable) {
|
|
inode->i_size = new_isize;
|
|
invalid |= NFS_INO_INVALID_DATA;
|
|
}
|
|
invalid |= NFS_INO_INVALID_ATTR;
|
|
} else if (new_isize > cur_isize) {
|
|
inode->i_size = new_isize;
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
|
|
}
|
|
nfsi->cache_change_attribute = jiffies;
|
|
dprintk("NFS: isize change on server for file %s/%ld\n",
|
|
inode->i_sb->s_id, inode->i_ino);
|
|
}
|
|
|
|
/* Check if the mtime agrees */
|
|
if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
|
|
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
|
|
dprintk("NFS: mtime change on server for file %s/%ld\n",
|
|
inode->i_sb->s_id, inode->i_ino);
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
|
|
nfsi->cache_change_attribute = jiffies;
|
|
}
|
|
|
|
/* If ctime has changed we should definitely clear access+acl caches */
|
|
if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
|
|
invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
|
|
memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
|
|
nfsi->cache_change_attribute = jiffies;
|
|
}
|
|
memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
|
|
|
|
if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
|
|
inode->i_uid != fattr->uid ||
|
|
inode->i_gid != fattr->gid)
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
|
|
|
|
inode->i_mode = fattr->mode;
|
|
inode->i_nlink = fattr->nlink;
|
|
inode->i_uid = fattr->uid;
|
|
inode->i_gid = fattr->gid;
|
|
|
|
if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
|
|
/*
|
|
* report the blocks in 512byte units
|
|
*/
|
|
inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
|
|
inode->i_blksize = inode->i_sb->s_blocksize;
|
|
} else {
|
|
inode->i_blocks = fattr->du.nfs2.blocks;
|
|
inode->i_blksize = fattr->du.nfs2.blocksize;
|
|
}
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_V4)) {
|
|
if (nfsi->change_attr != fattr->change_attr) {
|
|
dprintk("NFS: change_attr change on server for file %s/%ld\n",
|
|
inode->i_sb->s_id, inode->i_ino);
|
|
nfsi->change_attr = fattr->change_attr;
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
|
|
nfsi->cache_change_attribute = jiffies;
|
|
} else
|
|
invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA);
|
|
}
|
|
|
|
/* Update attrtimeo value if we're out of the unstable period */
|
|
if (invalid & NFS_INO_INVALID_ATTR) {
|
|
nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
|
|
nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
|
|
nfsi->attrtimeo_timestamp = jiffies;
|
|
} else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
|
|
if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
|
|
nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
|
|
nfsi->attrtimeo_timestamp = jiffies;
|
|
}
|
|
/* Don't invalidate the data if we were to blame */
|
|
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
|
|
|| S_ISLNK(inode->i_mode)))
|
|
invalid &= ~NFS_INO_INVALID_DATA;
|
|
if (data_stable)
|
|
invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
|
|
if (!nfs_have_delegation(inode, FMODE_READ))
|
|
nfsi->cache_validity |= invalid;
|
|
|
|
return 0;
|
|
out_changed:
|
|
/*
|
|
* Big trouble! The inode has become a different object.
|
|
*/
|
|
#ifdef NFS_PARANOIA
|
|
printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
|
|
__FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
|
|
#endif
|
|
out_err:
|
|
/*
|
|
* No need to worry about unhashing the dentry, as the
|
|
* lookup validation will know that the inode is bad.
|
|
* (But we fall through to invalidate the caches.)
|
|
*/
|
|
nfs_invalidate_inode(inode);
|
|
return -ESTALE;
|
|
|
|
out_fileid:
|
|
printk(KERN_ERR "NFS: server %s error: fileid changed\n"
|
|
"fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
|
|
NFS_SERVER(inode)->hostname, inode->i_sb->s_id,
|
|
(long long)nfsi->fileid, (long long)fattr->fileid);
|
|
goto out_err;
|
|
}
|
|
|
|
/*
|
|
* File system information
|
|
*/
|
|
|
|
static int nfs_set_super(struct super_block *s, void *data)
|
|
{
|
|
s->s_fs_info = data;
|
|
return set_anon_super(s, data);
|
|
}
|
|
|
|
static int nfs_compare_super(struct super_block *sb, void *data)
|
|
{
|
|
struct nfs_server *server = data;
|
|
struct nfs_server *old = NFS_SB(sb);
|
|
|
|
if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
|
|
return 0;
|
|
if (old->addr.sin_port != server->addr.sin_port)
|
|
return 0;
|
|
return !nfs_compare_fh(&old->fh, &server->fh);
|
|
}
|
|
|
|
static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *raw_data)
|
|
{
|
|
int error;
|
|
struct nfs_server *server = NULL;
|
|
struct super_block *s;
|
|
struct nfs_fh *root;
|
|
struct nfs_mount_data *data = raw_data;
|
|
|
|
s = ERR_PTR(-EINVAL);
|
|
if (data == NULL) {
|
|
dprintk("%s: missing data argument\n", __FUNCTION__);
|
|
goto out_err;
|
|
}
|
|
if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
|
|
dprintk("%s: bad mount version\n", __FUNCTION__);
|
|
goto out_err;
|
|
}
|
|
switch (data->version) {
|
|
case 1:
|
|
data->namlen = 0;
|
|
case 2:
|
|
data->bsize = 0;
|
|
case 3:
|
|
if (data->flags & NFS_MOUNT_VER3) {
|
|
dprintk("%s: mount structure version %d does not support NFSv3\n",
|
|
__FUNCTION__,
|
|
data->version);
|
|
goto out_err;
|
|
}
|
|
data->root.size = NFS2_FHSIZE;
|
|
memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
|
|
case 4:
|
|
if (data->flags & NFS_MOUNT_SECFLAVOUR) {
|
|
dprintk("%s: mount structure version %d does not support strong security\n",
|
|
__FUNCTION__,
|
|
data->version);
|
|
goto out_err;
|
|
}
|
|
case 5:
|
|
memset(data->context, 0, sizeof(data->context));
|
|
}
|
|
#ifndef CONFIG_NFS_V3
|
|
/* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
|
|
s = ERR_PTR(-EPROTONOSUPPORT);
|
|
if (data->flags & NFS_MOUNT_VER3) {
|
|
dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
|
|
goto out_err;
|
|
}
|
|
#endif /* CONFIG_NFS_V3 */
|
|
|
|
s = ERR_PTR(-ENOMEM);
|
|
server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
|
|
if (!server)
|
|
goto out_err;
|
|
/* Zero out the NFS state stuff */
|
|
init_nfsv4_state(server);
|
|
server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
|
|
|
|
root = &server->fh;
|
|
if (data->flags & NFS_MOUNT_VER3)
|
|
root->size = data->root.size;
|
|
else
|
|
root->size = NFS2_FHSIZE;
|
|
s = ERR_PTR(-EINVAL);
|
|
if (root->size > sizeof(root->data)) {
|
|
dprintk("%s: invalid root filehandle\n", __FUNCTION__);
|
|
goto out_err;
|
|
}
|
|
memcpy(root->data, data->root.data, root->size);
|
|
|
|
/* We now require that the mount process passes the remote address */
|
|
memcpy(&server->addr, &data->addr, sizeof(server->addr));
|
|
if (server->addr.sin_addr.s_addr == INADDR_ANY) {
|
|
dprintk("%s: mount program didn't pass remote address!\n",
|
|
__FUNCTION__);
|
|
goto out_err;
|
|
}
|
|
|
|
/* Fire up rpciod if not yet running */
|
|
s = ERR_PTR(rpciod_up());
|
|
if (IS_ERR(s)) {
|
|
dprintk("%s: couldn't start rpciod! Error = %ld\n",
|
|
__FUNCTION__, PTR_ERR(s));
|
|
goto out_err;
|
|
}
|
|
|
|
s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
|
|
if (IS_ERR(s) || s->s_root)
|
|
goto out_rpciod_down;
|
|
|
|
s->s_flags = flags;
|
|
|
|
error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
|
|
if (error) {
|
|
up_write(&s->s_umount);
|
|
deactivate_super(s);
|
|
return ERR_PTR(error);
|
|
}
|
|
s->s_flags |= MS_ACTIVE;
|
|
return s;
|
|
out_rpciod_down:
|
|
rpciod_down();
|
|
out_err:
|
|
kfree(server);
|
|
return s;
|
|
}
|
|
|
|
static void nfs_kill_super(struct super_block *s)
|
|
{
|
|
struct nfs_server *server = NFS_SB(s);
|
|
|
|
kill_anon_super(s);
|
|
|
|
if (!IS_ERR(server->client))
|
|
rpc_shutdown_client(server->client);
|
|
if (!IS_ERR(server->client_sys))
|
|
rpc_shutdown_client(server->client_sys);
|
|
if (!IS_ERR(server->client_acl))
|
|
rpc_shutdown_client(server->client_acl);
|
|
|
|
if (!(server->flags & NFS_MOUNT_NONLM))
|
|
lockd_down(); /* release rpc.lockd */
|
|
|
|
rpciod_down(); /* release rpciod */
|
|
|
|
kfree(server->hostname);
|
|
kfree(server);
|
|
}
|
|
|
|
static struct file_system_type nfs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "nfs",
|
|
.get_sb = nfs_get_sb,
|
|
.kill_sb = nfs_kill_super,
|
|
.fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
|
|
};
|
|
|
|
#ifdef CONFIG_NFS_V4
|
|
|
|
static void nfs4_clear_inode(struct inode *);
|
|
|
|
|
|
static struct super_operations nfs4_sops = {
|
|
.alloc_inode = nfs_alloc_inode,
|
|
.destroy_inode = nfs_destroy_inode,
|
|
.write_inode = nfs_write_inode,
|
|
.delete_inode = nfs_delete_inode,
|
|
.statfs = nfs_statfs,
|
|
.clear_inode = nfs4_clear_inode,
|
|
.umount_begin = nfs_umount_begin,
|
|
.show_options = nfs_show_options,
|
|
.show_stats = nfs_show_stats,
|
|
};
|
|
|
|
/*
|
|
* Clean out any remaining NFSv4 state that might be left over due
|
|
* to open() calls that passed nfs_atomic_lookup, but failed to call
|
|
* nfs_open().
|
|
*/
|
|
static void nfs4_clear_inode(struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
/* If we are holding a delegation, return it! */
|
|
nfs_inode_return_delegation(inode);
|
|
/* First call standard NFS clear_inode() code */
|
|
nfs_clear_inode(inode);
|
|
/* Now clear out any remaining state */
|
|
while (!list_empty(&nfsi->open_states)) {
|
|
struct nfs4_state *state;
|
|
|
|
state = list_entry(nfsi->open_states.next,
|
|
struct nfs4_state,
|
|
inode_states);
|
|
dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
|
|
__FUNCTION__,
|
|
inode->i_sb->s_id,
|
|
(long long)NFS_FILEID(inode),
|
|
state);
|
|
BUG_ON(atomic_read(&state->count) != 1);
|
|
nfs4_close_state(state, state->state);
|
|
}
|
|
}
|
|
|
|
|
|
static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
|
|
{
|
|
struct nfs_server *server;
|
|
struct nfs4_client *clp = NULL;
|
|
struct rpc_xprt *xprt = NULL;
|
|
struct rpc_clnt *clnt = NULL;
|
|
struct rpc_timeout timeparms;
|
|
rpc_authflavor_t authflavour;
|
|
int err = -EIO;
|
|
|
|
sb->s_blocksize_bits = 0;
|
|
sb->s_blocksize = 0;
|
|
server = NFS_SB(sb);
|
|
if (data->rsize != 0)
|
|
server->rsize = nfs_block_size(data->rsize, NULL);
|
|
if (data->wsize != 0)
|
|
server->wsize = nfs_block_size(data->wsize, NULL);
|
|
server->flags = data->flags & NFS_MOUNT_FLAGMASK;
|
|
server->caps = NFS_CAP_ATOMIC_OPEN;
|
|
|
|
server->acregmin = data->acregmin*HZ;
|
|
server->acregmax = data->acregmax*HZ;
|
|
server->acdirmin = data->acdirmin*HZ;
|
|
server->acdirmax = data->acdirmax*HZ;
|
|
|
|
server->rpc_ops = &nfs_v4_clientops;
|
|
|
|
nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
|
|
|
|
server->retrans_timeo = timeparms.to_initval;
|
|
server->retrans_count = timeparms.to_retries;
|
|
|
|
clp = nfs4_get_client(&server->addr.sin_addr);
|
|
if (!clp) {
|
|
dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
|
|
return -EIO;
|
|
}
|
|
|
|
/* Now create transport and client */
|
|
authflavour = RPC_AUTH_UNIX;
|
|
if (data->auth_flavourlen != 0) {
|
|
if (data->auth_flavourlen != 1) {
|
|
dprintk("%s: Invalid number of RPC auth flavours %d.\n",
|
|
__FUNCTION__, data->auth_flavourlen);
|
|
err = -EINVAL;
|
|
goto out_fail;
|
|
}
|
|
if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
|
|
err = -EFAULT;
|
|
goto out_fail;
|
|
}
|
|
}
|
|
|
|
down_write(&clp->cl_sem);
|
|
if (IS_ERR(clp->cl_rpcclient)) {
|
|
xprt = xprt_create_proto(data->proto, &server->addr, &timeparms);
|
|
if (IS_ERR(xprt)) {
|
|
up_write(&clp->cl_sem);
|
|
err = PTR_ERR(xprt);
|
|
dprintk("%s: cannot create RPC transport. Error = %d\n",
|
|
__FUNCTION__, err);
|
|
goto out_fail;
|
|
}
|
|
clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
|
|
server->rpc_ops->version, authflavour);
|
|
if (IS_ERR(clnt)) {
|
|
up_write(&clp->cl_sem);
|
|
err = PTR_ERR(clnt);
|
|
dprintk("%s: cannot create RPC client. Error = %d\n",
|
|
__FUNCTION__, err);
|
|
goto out_fail;
|
|
}
|
|
clnt->cl_intr = 1;
|
|
clnt->cl_softrtry = 1;
|
|
clp->cl_rpcclient = clnt;
|
|
memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
|
|
nfs_idmap_new(clp);
|
|
}
|
|
list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
|
|
clnt = rpc_clone_client(clp->cl_rpcclient);
|
|
if (!IS_ERR(clnt))
|
|
server->nfs4_state = clp;
|
|
up_write(&clp->cl_sem);
|
|
clp = NULL;
|
|
|
|
if (IS_ERR(clnt)) {
|
|
err = PTR_ERR(clnt);
|
|
dprintk("%s: cannot create RPC client. Error = %d\n",
|
|
__FUNCTION__, err);
|
|
return err;
|
|
}
|
|
|
|
server->client = clnt;
|
|
|
|
if (server->nfs4_state->cl_idmap == NULL) {
|
|
dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (clnt->cl_auth->au_flavor != authflavour) {
|
|
struct rpc_auth *auth;
|
|
|
|
auth = rpcauth_create(authflavour, clnt);
|
|
if (IS_ERR(auth)) {
|
|
dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
|
|
return PTR_ERR(auth);
|
|
}
|
|
}
|
|
|
|
sb->s_time_gran = 1;
|
|
|
|
sb->s_op = &nfs4_sops;
|
|
err = nfs_sb_init(sb, authflavour);
|
|
if (err == 0)
|
|
return 0;
|
|
out_fail:
|
|
if (clp)
|
|
nfs4_put_client(clp);
|
|
return err;
|
|
}
|
|
|
|
static int nfs4_compare_super(struct super_block *sb, void *data)
|
|
{
|
|
struct nfs_server *server = data;
|
|
struct nfs_server *old = NFS_SB(sb);
|
|
|
|
if (strcmp(server->hostname, old->hostname) != 0)
|
|
return 0;
|
|
if (strcmp(server->mnt_path, old->mnt_path) != 0)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static void *
|
|
nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
|
|
{
|
|
void *p = NULL;
|
|
|
|
if (!src->len)
|
|
return ERR_PTR(-EINVAL);
|
|
if (src->len < maxlen)
|
|
maxlen = src->len;
|
|
if (dst == NULL) {
|
|
p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
|
|
if (p == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
if (copy_from_user(dst, src->data, maxlen)) {
|
|
kfree(p);
|
|
return ERR_PTR(-EFAULT);
|
|
}
|
|
dst[maxlen] = '\0';
|
|
return dst;
|
|
}
|
|
|
|
static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *raw_data)
|
|
{
|
|
int error;
|
|
struct nfs_server *server;
|
|
struct super_block *s;
|
|
struct nfs4_mount_data *data = raw_data;
|
|
void *p;
|
|
|
|
if (data == NULL) {
|
|
dprintk("%s: missing data argument\n", __FUNCTION__);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
|
|
dprintk("%s: bad mount version\n", __FUNCTION__);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
|
|
if (!server)
|
|
return ERR_PTR(-ENOMEM);
|
|
/* Zero out the NFS state stuff */
|
|
init_nfsv4_state(server);
|
|
server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
|
|
|
|
p = nfs_copy_user_string(NULL, &data->hostname, 256);
|
|
if (IS_ERR(p))
|
|
goto out_err;
|
|
server->hostname = p;
|
|
|
|
p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
|
|
if (IS_ERR(p))
|
|
goto out_err;
|
|
server->mnt_path = p;
|
|
|
|
p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
|
|
sizeof(server->ip_addr) - 1);
|
|
if (IS_ERR(p))
|
|
goto out_err;
|
|
|
|
/* We now require that the mount process passes the remote address */
|
|
if (data->host_addrlen != sizeof(server->addr)) {
|
|
s = ERR_PTR(-EINVAL);
|
|
goto out_free;
|
|
}
|
|
if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
|
|
s = ERR_PTR(-EFAULT);
|
|
goto out_free;
|
|
}
|
|
if (server->addr.sin_family != AF_INET ||
|
|
server->addr.sin_addr.s_addr == INADDR_ANY) {
|
|
dprintk("%s: mount program didn't pass remote IP address!\n",
|
|
__FUNCTION__);
|
|
s = ERR_PTR(-EINVAL);
|
|
goto out_free;
|
|
}
|
|
|
|
/* Fire up rpciod if not yet running */
|
|
s = ERR_PTR(rpciod_up());
|
|
if (IS_ERR(s)) {
|
|
dprintk("%s: couldn't start rpciod! Error = %ld\n",
|
|
__FUNCTION__, PTR_ERR(s));
|
|
goto out_free;
|
|
}
|
|
|
|
s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
|
|
|
|
if (IS_ERR(s) || s->s_root)
|
|
goto out_free;
|
|
|
|
s->s_flags = flags;
|
|
|
|
error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
|
|
if (error) {
|
|
up_write(&s->s_umount);
|
|
deactivate_super(s);
|
|
return ERR_PTR(error);
|
|
}
|
|
s->s_flags |= MS_ACTIVE;
|
|
return s;
|
|
out_err:
|
|
s = (struct super_block *)p;
|
|
out_free:
|
|
kfree(server->mnt_path);
|
|
kfree(server->hostname);
|
|
nfs_free_iostats(server->io_stats);
|
|
kfree(server);
|
|
return s;
|
|
}
|
|
|
|
static void nfs4_kill_super(struct super_block *sb)
|
|
{
|
|
struct nfs_server *server = NFS_SB(sb);
|
|
|
|
nfs_return_all_delegations(sb);
|
|
kill_anon_super(sb);
|
|
|
|
nfs4_renewd_prepare_shutdown(server);
|
|
|
|
if (server->client != NULL && !IS_ERR(server->client))
|
|
rpc_shutdown_client(server->client);
|
|
|
|
destroy_nfsv4_state(server);
|
|
|
|
rpciod_down();
|
|
|
|
kfree(server->hostname);
|
|
kfree(server);
|
|
}
|
|
|
|
static struct file_system_type nfs4_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "nfs4",
|
|
.get_sb = nfs4_get_sb,
|
|
.kill_sb = nfs4_kill_super,
|
|
.fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
|
|
};
|
|
|
|
static const int nfs_set_port_min = 0;
|
|
static const int nfs_set_port_max = 65535;
|
|
static int param_set_port(const char *val, struct kernel_param *kp)
|
|
{
|
|
char *endp;
|
|
int num = simple_strtol(val, &endp, 0);
|
|
if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max)
|
|
return -EINVAL;
|
|
*((int *)kp->arg) = num;
|
|
return 0;
|
|
}
|
|
|
|
module_param_call(callback_tcpport, param_set_port, param_get_int,
|
|
&nfs_callback_set_tcpport, 0644);
|
|
|
|
static int param_set_idmap_timeout(const char *val, struct kernel_param *kp)
|
|
{
|
|
char *endp;
|
|
int num = simple_strtol(val, &endp, 0);
|
|
int jif = num * HZ;
|
|
if (endp == val || *endp || num < 0 || jif < num)
|
|
return -EINVAL;
|
|
*((int *)kp->arg) = jif;
|
|
return 0;
|
|
}
|
|
|
|
module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int,
|
|
&nfs_idmap_cache_timeout, 0644);
|
|
|
|
#define nfs4_init_once(nfsi) \
|
|
do { \
|
|
INIT_LIST_HEAD(&(nfsi)->open_states); \
|
|
nfsi->delegation = NULL; \
|
|
nfsi->delegation_state = 0; \
|
|
init_rwsem(&nfsi->rwsem); \
|
|
} while(0)
|
|
|
|
static inline int register_nfs4fs(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = nfs_register_sysctl();
|
|
if (ret != 0)
|
|
return ret;
|
|
ret = register_filesystem(&nfs4_fs_type);
|
|
if (ret != 0)
|
|
nfs_unregister_sysctl();
|
|
return ret;
|
|
}
|
|
|
|
static inline void unregister_nfs4fs(void)
|
|
{
|
|
unregister_filesystem(&nfs4_fs_type);
|
|
nfs_unregister_sysctl();
|
|
}
|
|
#else
|
|
#define nfs4_init_once(nfsi) \
|
|
do { } while (0)
|
|
#define register_nfs4fs() (0)
|
|
#define unregister_nfs4fs()
|
|
#endif
|
|
|
|
extern int nfs_init_nfspagecache(void);
|
|
extern void nfs_destroy_nfspagecache(void);
|
|
extern int nfs_init_readpagecache(void);
|
|
extern void nfs_destroy_readpagecache(void);
|
|
extern int nfs_init_writepagecache(void);
|
|
extern void nfs_destroy_writepagecache(void);
|
|
#ifdef CONFIG_NFS_DIRECTIO
|
|
extern int nfs_init_directcache(void);
|
|
extern void nfs_destroy_directcache(void);
|
|
#endif
|
|
|
|
static kmem_cache_t * nfs_inode_cachep;
|
|
|
|
static struct inode *nfs_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct nfs_inode *nfsi;
|
|
nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
|
|
if (!nfsi)
|
|
return NULL;
|
|
nfsi->flags = 0UL;
|
|
nfsi->cache_validity = 0UL;
|
|
nfsi->cache_change_attribute = jiffies;
|
|
#ifdef CONFIG_NFS_V3_ACL
|
|
nfsi->acl_access = ERR_PTR(-EAGAIN);
|
|
nfsi->acl_default = ERR_PTR(-EAGAIN);
|
|
#endif
|
|
#ifdef CONFIG_NFS_V4
|
|
nfsi->nfs4_acl = NULL;
|
|
#endif /* CONFIG_NFS_V4 */
|
|
return &nfsi->vfs_inode;
|
|
}
|
|
|
|
static void nfs_destroy_inode(struct inode *inode)
|
|
{
|
|
kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
|
|
}
|
|
|
|
static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
|
|
{
|
|
struct nfs_inode *nfsi = (struct nfs_inode *) foo;
|
|
|
|
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
|
|
SLAB_CTOR_CONSTRUCTOR) {
|
|
inode_init_once(&nfsi->vfs_inode);
|
|
spin_lock_init(&nfsi->req_lock);
|
|
INIT_LIST_HEAD(&nfsi->dirty);
|
|
INIT_LIST_HEAD(&nfsi->commit);
|
|
INIT_LIST_HEAD(&nfsi->open_files);
|
|
INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
|
|
atomic_set(&nfsi->data_updates, 0);
|
|
nfsi->ndirty = 0;
|
|
nfsi->ncommit = 0;
|
|
nfsi->npages = 0;
|
|
nfs4_init_once(nfsi);
|
|
}
|
|
}
|
|
|
|
static int nfs_init_inodecache(void)
|
|
{
|
|
nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
|
|
sizeof(struct nfs_inode),
|
|
0, SLAB_RECLAIM_ACCOUNT,
|
|
init_once, NULL);
|
|
if (nfs_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nfs_destroy_inodecache(void)
|
|
{
|
|
if (kmem_cache_destroy(nfs_inode_cachep))
|
|
printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
|
|
}
|
|
|
|
/*
|
|
* Initialize NFS
|
|
*/
|
|
static int __init init_nfs_fs(void)
|
|
{
|
|
int err;
|
|
|
|
err = nfs_init_nfspagecache();
|
|
if (err)
|
|
goto out4;
|
|
|
|
err = nfs_init_inodecache();
|
|
if (err)
|
|
goto out3;
|
|
|
|
err = nfs_init_readpagecache();
|
|
if (err)
|
|
goto out2;
|
|
|
|
err = nfs_init_writepagecache();
|
|
if (err)
|
|
goto out1;
|
|
|
|
#ifdef CONFIG_NFS_DIRECTIO
|
|
err = nfs_init_directcache();
|
|
if (err)
|
|
goto out0;
|
|
#endif
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
rpc_proc_register(&nfs_rpcstat);
|
|
#endif
|
|
err = register_filesystem(&nfs_fs_type);
|
|
if (err)
|
|
goto out;
|
|
if ((err = register_nfs4fs()) != 0)
|
|
goto out;
|
|
return 0;
|
|
out:
|
|
#ifdef CONFIG_PROC_FS
|
|
rpc_proc_unregister("nfs");
|
|
#endif
|
|
#ifdef CONFIG_NFS_DIRECTIO
|
|
nfs_destroy_directcache();
|
|
out0:
|
|
#endif
|
|
nfs_destroy_writepagecache();
|
|
out1:
|
|
nfs_destroy_readpagecache();
|
|
out2:
|
|
nfs_destroy_inodecache();
|
|
out3:
|
|
nfs_destroy_nfspagecache();
|
|
out4:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_nfs_fs(void)
|
|
{
|
|
#ifdef CONFIG_NFS_DIRECTIO
|
|
nfs_destroy_directcache();
|
|
#endif
|
|
nfs_destroy_writepagecache();
|
|
nfs_destroy_readpagecache();
|
|
nfs_destroy_inodecache();
|
|
nfs_destroy_nfspagecache();
|
|
#ifdef CONFIG_PROC_FS
|
|
rpc_proc_unregister("nfs");
|
|
#endif
|
|
unregister_filesystem(&nfs_fs_type);
|
|
unregister_nfs4fs();
|
|
}
|
|
|
|
/* Not quite true; I just maintain it */
|
|
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(init_nfs_fs)
|
|
module_exit(exit_nfs_fs)
|