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1529 lines
43 KiB
1529 lines
43 KiB
/*
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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@lxorguk.ukuu.org.uk>, 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/module.h>
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#include <linux/init.h>
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#include <linux/sched.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/sunrpc/metrics.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 <linux/inet.h>
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#include <linux/nfs_xdr.h>
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|
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#include <asm/system.h>
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#include <asm/uaccess.h>
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|
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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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#include "internal.h"
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#include "fscache.h"
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#define NFSDBG_FACILITY NFSDBG_VFS
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#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
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/* Default is to see 64-bit inode numbers */
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static int enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
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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 kmem_cache * nfs_inode_cachep;
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|
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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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|
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/**
|
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* nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
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* @word: long word containing the bit lock
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|
*/
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int nfs_wait_bit_killable(void *word)
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|
{
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if (fatal_signal_pending(current))
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return -ERESTARTSYS;
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schedule();
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return 0;
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}
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|
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/**
|
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* nfs_compat_user_ino64 - returns the user-visible inode number
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* @fileid: 64-bit fileid
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*
|
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* This function returns a 32-bit inode number if the boot parameter
|
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* nfs.enable_ino64 is zero.
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*/
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u64 nfs_compat_user_ino64(u64 fileid)
|
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{
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int ino;
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|
|
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if (enable_ino64)
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return fileid;
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ino = fileid;
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if (sizeof(ino) < sizeof(fileid))
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ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
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return ino;
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}
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|
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int nfs_write_inode(struct inode *inode, int sync)
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{
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int ret;
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|
|
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if (sync) {
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ret = filemap_fdatawait(inode->i_mapping);
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if (ret == 0)
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ret = nfs_commit_inode(inode, FLUSH_SYNC);
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} else
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ret = nfs_commit_inode(inode, 0);
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if (ret >= 0)
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return 0;
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__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
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return ret;
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}
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|
|
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void nfs_clear_inode(struct inode *inode)
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|
{
|
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/*
|
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* The following should never happen...
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*/
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BUG_ON(nfs_have_writebacks(inode));
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BUG_ON(!list_empty(&NFS_I(inode)->open_files));
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nfs_zap_acl_cache(inode);
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nfs_access_zap_cache(inode);
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nfs_fscache_release_inode_cookie(inode);
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}
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|
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/**
|
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* nfs_sync_mapping - helper to flush all mmapped dirty data to disk
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|
*/
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int nfs_sync_mapping(struct address_space *mapping)
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{
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int ret;
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|
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if (mapping->nrpages == 0)
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return 0;
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unmap_mapping_range(mapping, 0, 0, 0);
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ret = filemap_write_and_wait(mapping);
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if (ret != 0)
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goto out;
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ret = nfs_wb_all(mapping->host);
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out:
|
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return ret;
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}
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|
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/*
|
|
* Invalidate the local caches
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|
*/
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static void nfs_zap_caches_locked(struct inode *inode)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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int mode = inode->i_mode;
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nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
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nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
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nfsi->attrtimeo_timestamp = jiffies;
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memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
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if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
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nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
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else
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nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
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}
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void nfs_zap_caches(struct inode *inode)
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{
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spin_lock(&inode->i_lock);
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nfs_zap_caches_locked(inode);
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spin_unlock(&inode->i_lock);
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}
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void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
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{
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if (mapping->nrpages != 0) {
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spin_lock(&inode->i_lock);
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NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
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spin_unlock(&inode->i_lock);
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}
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}
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void nfs_zap_acl_cache(struct inode *inode)
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{
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void (*clear_acl_cache)(struct inode *);
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clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
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if (clear_acl_cache != NULL)
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clear_acl_cache(inode);
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spin_lock(&inode->i_lock);
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NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
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spin_unlock(&inode->i_lock);
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}
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void nfs_invalidate_atime(struct inode *inode)
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{
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spin_lock(&inode->i_lock);
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NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
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spin_unlock(&inode->i_lock);
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}
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|
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/*
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* Invalidate, but do not unhash, the inode.
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* NB: must be called with inode->i_lock held!
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*/
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static void nfs_invalidate_inode(struct inode *inode)
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{
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set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
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nfs_zap_caches_locked(inode);
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}
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struct nfs_find_desc {
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struct nfs_fh *fh;
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struct nfs_fattr *fattr;
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};
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|
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/*
|
|
* In NFSv3 we can have 64bit inode numbers. In order to support
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* this, and re-exported directories (also seen in NFSv2)
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|
* we are forced to allow 2 different inodes to have the same
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* i_ino.
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*/
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static int
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nfs_find_actor(struct inode *inode, void *opaque)
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{
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struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
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struct nfs_fh *fh = desc->fh;
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struct nfs_fattr *fattr = desc->fattr;
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if (NFS_FILEID(inode) != fattr->fileid)
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return 0;
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if (nfs_compare_fh(NFS_FH(inode), fh))
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return 0;
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if (is_bad_inode(inode) || NFS_STALE(inode))
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return 0;
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return 1;
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}
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static int
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nfs_init_locked(struct inode *inode, void *opaque)
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{
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struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
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struct nfs_fattr *fattr = desc->fattr;
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set_nfs_fileid(inode, fattr->fileid);
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nfs_copy_fh(NFS_FH(inode), desc->fh);
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return 0;
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}
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/* Don't use READDIRPLUS on directories that we believe are too large */
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#define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
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/*
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* This is our front-end to iget that looks up inodes by file handle
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* instead of inode number.
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*/
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struct inode *
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nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
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{
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struct nfs_find_desc desc = {
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.fh = fh,
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.fattr = fattr
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};
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struct inode *inode = ERR_PTR(-ENOENT);
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unsigned long hash;
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if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
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goto out_no_inode;
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if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
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goto out_no_inode;
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hash = nfs_fattr_to_ino_t(fattr);
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inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
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if (inode == NULL) {
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inode = ERR_PTR(-ENOMEM);
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goto out_no_inode;
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}
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if (inode->i_state & I_NEW) {
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struct nfs_inode *nfsi = NFS_I(inode);
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unsigned long now = jiffies;
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/* We set i_ino for the few things that still rely on it,
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* such as stat(2) */
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inode->i_ino = hash;
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|
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/* We can't support update_atime(), since the server will reset it */
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inode->i_flags |= S_NOATIME|S_NOCMTIME;
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inode->i_mode = fattr->mode;
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/* Why so? Because we want revalidate for devices/FIFOs, and
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* that's precisely what we have in nfs_file_inode_operations.
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*/
|
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inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
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if (S_ISREG(inode->i_mode)) {
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inode->i_fop = &nfs_file_operations;
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inode->i_data.a_ops = &nfs_file_aops;
|
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inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
|
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} else if (S_ISDIR(inode->i_mode)) {
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inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
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inode->i_fop = &nfs_dir_operations;
|
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if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
|
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&& fattr->size <= NFS_LIMIT_READDIRPLUS)
|
|
set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
|
|
/* Deal with crossing mountpoints */
|
|
if ((fattr->valid & NFS_ATTR_FATTR_FSID)
|
|
&& !nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) {
|
|
if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
|
|
inode->i_op = &nfs_referral_inode_operations;
|
|
else
|
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inode->i_op = &nfs_mountpoint_inode_operations;
|
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inode->i_fop = NULL;
|
|
set_bit(NFS_INO_MOUNTPOINT, &nfsi->flags);
|
|
}
|
|
} else if (S_ISLNK(inode->i_mode))
|
|
inode->i_op = &nfs_symlink_inode_operations;
|
|
else
|
|
init_special_inode(inode, inode->i_mode, fattr->rdev);
|
|
|
|
memset(&inode->i_atime, 0, sizeof(inode->i_atime));
|
|
memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
|
|
memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
|
|
nfsi->change_attr = 0;
|
|
inode->i_size = 0;
|
|
inode->i_nlink = 0;
|
|
inode->i_uid = -2;
|
|
inode->i_gid = -2;
|
|
inode->i_blocks = 0;
|
|
memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
|
|
|
|
nfsi->read_cache_jiffies = fattr->time_start;
|
|
nfsi->attr_gencount = fattr->gencount;
|
|
if (fattr->valid & NFS_ATTR_FATTR_ATIME)
|
|
inode->i_atime = fattr->atime;
|
|
if (fattr->valid & NFS_ATTR_FATTR_MTIME)
|
|
inode->i_mtime = fattr->mtime;
|
|
if (fattr->valid & NFS_ATTR_FATTR_CTIME)
|
|
inode->i_ctime = fattr->ctime;
|
|
if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
|
|
nfsi->change_attr = fattr->change_attr;
|
|
if (fattr->valid & NFS_ATTR_FATTR_SIZE)
|
|
inode->i_size = nfs_size_to_loff_t(fattr->size);
|
|
if (fattr->valid & NFS_ATTR_FATTR_NLINK)
|
|
inode->i_nlink = fattr->nlink;
|
|
if (fattr->valid & NFS_ATTR_FATTR_OWNER)
|
|
inode->i_uid = fattr->uid;
|
|
if (fattr->valid & NFS_ATTR_FATTR_GROUP)
|
|
inode->i_gid = fattr->gid;
|
|
if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
|
|
inode->i_blocks = fattr->du.nfs2.blocks;
|
|
if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
|
|
/*
|
|
* report the blocks in 512byte units
|
|
*/
|
|
inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
|
|
}
|
|
nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
|
|
nfsi->attrtimeo_timestamp = now;
|
|
nfsi->access_cache = RB_ROOT;
|
|
|
|
nfs_fscache_init_inode_cookie(inode);
|
|
|
|
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:
|
|
dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
|
|
goto out;
|
|
}
|
|
|
|
#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE)
|
|
|
|
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);
|
|
|
|
/* skip mode change if it's just for clearing setuid/setgid */
|
|
if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
|
|
attr->ia_valid &= ~ATTR_MODE;
|
|
|
|
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 & ~ATTR_FILE) == 0)
|
|
return 0;
|
|
|
|
/* Write all dirty data */
|
|
if (S_ISREG(inode->i_mode)) {
|
|
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);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
|
|
* @inode: inode of the file used
|
|
* @offset: file offset to start truncating
|
|
*
|
|
* This is a copy of the common vmtruncate, but with the locking
|
|
* corrected to take into account the fact that NFS requires
|
|
* inode->i_size to be updated under the inode->i_lock.
|
|
*/
|
|
static int nfs_vmtruncate(struct inode * inode, loff_t offset)
|
|
{
|
|
if (i_size_read(inode) < offset) {
|
|
unsigned long limit;
|
|
|
|
limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
|
|
if (limit != RLIM_INFINITY && offset > limit)
|
|
goto out_sig;
|
|
if (offset > inode->i_sb->s_maxbytes)
|
|
goto out_big;
|
|
spin_lock(&inode->i_lock);
|
|
i_size_write(inode, offset);
|
|
spin_unlock(&inode->i_lock);
|
|
} else {
|
|
struct address_space *mapping = inode->i_mapping;
|
|
|
|
/*
|
|
* truncation of in-use swapfiles is disallowed - it would
|
|
* cause subsequent swapout to scribble on the now-freed
|
|
* blocks.
|
|
*/
|
|
if (IS_SWAPFILE(inode))
|
|
return -ETXTBSY;
|
|
spin_lock(&inode->i_lock);
|
|
i_size_write(inode, offset);
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
/*
|
|
* unmap_mapping_range is called twice, first simply for
|
|
* efficiency so that truncate_inode_pages does fewer
|
|
* single-page unmaps. However after this first call, and
|
|
* before truncate_inode_pages finishes, it is possible for
|
|
* private pages to be COWed, which remain after
|
|
* truncate_inode_pages finishes, hence the second
|
|
* unmap_mapping_range call must be made for correctness.
|
|
*/
|
|
unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
|
|
truncate_inode_pages(mapping, offset);
|
|
unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
|
|
}
|
|
return 0;
|
|
out_sig:
|
|
send_sig(SIGXFSZ, current, 0);
|
|
out_big:
|
|
return -EFBIG;
|
|
}
|
|
|
|
/**
|
|
* 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) {
|
|
spin_lock(&inode->i_lock);
|
|
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;
|
|
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);
|
|
nfs_vmtruncate(inode, attr->ia_size);
|
|
}
|
|
}
|
|
|
|
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.
|
|
*
|
|
* Hold the i_mutex to suspend application writes temporarily;
|
|
* this prevents long-running writing applications from blocking
|
|
* nfs_wb_nocommit.
|
|
*/
|
|
if (S_ISREG(inode->i_mode)) {
|
|
mutex_lock(&inode->i_mutex);
|
|
nfs_wb_nocommit(inode);
|
|
mutex_unlock(&inode->i_mutex);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* nfs_close_context - Common close_context() routine NFSv2/v3
|
|
* @ctx: pointer to context
|
|
* @is_sync: is this a synchronous close
|
|
*
|
|
* always ensure that the attributes are up to date if we're mounted
|
|
* with close-to-open semantics
|
|
*/
|
|
void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
|
|
{
|
|
struct inode *inode;
|
|
struct nfs_server *server;
|
|
|
|
if (!(ctx->mode & FMODE_WRITE))
|
|
return;
|
|
if (!is_sync)
|
|
return;
|
|
inode = ctx->path.dentry->d_inode;
|
|
if (!list_empty(&NFS_I(inode)->open_files))
|
|
return;
|
|
server = NFS_SERVER(inode);
|
|
if (server->flags & NFS_MOUNT_NOCTO)
|
|
return;
|
|
nfs_revalidate_inode(server, inode);
|
|
}
|
|
|
|
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 = kmalloc(sizeof(*ctx), GFP_KERNEL);
|
|
if (ctx != NULL) {
|
|
ctx->path.dentry = dget(dentry);
|
|
ctx->path.mnt = mntget(mnt);
|
|
ctx->cred = get_rpccred(cred);
|
|
ctx->state = NULL;
|
|
ctx->lockowner = current->files;
|
|
ctx->flags = 0;
|
|
ctx->error = 0;
|
|
ctx->dir_cookie = 0;
|
|
atomic_set(&ctx->count, 1);
|
|
}
|
|
return ctx;
|
|
}
|
|
|
|
struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
|
|
{
|
|
if (ctx != NULL)
|
|
atomic_inc(&ctx->count);
|
|
return ctx;
|
|
}
|
|
|
|
static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
|
|
{
|
|
struct inode *inode = ctx->path.dentry->d_inode;
|
|
|
|
if (!atomic_dec_and_lock(&ctx->count, &inode->i_lock))
|
|
return;
|
|
list_del(&ctx->list);
|
|
spin_unlock(&inode->i_lock);
|
|
NFS_PROTO(inode)->close_context(ctx, is_sync);
|
|
if (ctx->cred != NULL)
|
|
put_rpccred(ctx->cred);
|
|
path_put(&ctx->path);
|
|
kfree(ctx);
|
|
}
|
|
|
|
void put_nfs_open_context(struct nfs_open_context *ctx)
|
|
{
|
|
__put_nfs_open_context(ctx, 0);
|
|
}
|
|
|
|
static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
|
|
{
|
|
__put_nfs_open_context(ctx, 1);
|
|
}
|
|
|
|
/*
|
|
* 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_path.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, fmode_t 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_path.dentry->d_inode;
|
|
struct nfs_open_context *ctx = nfs_file_open_context(filp);
|
|
|
|
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_sync(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 = rpc_lookup_cred();
|
|
if (IS_ERR(cred))
|
|
return PTR_ERR(cred);
|
|
ctx = alloc_nfs_open_context(filp->f_path.mnt, filp->f_path.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);
|
|
nfs_fscache_set_inode_cookie(inode, filp);
|
|
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));
|
|
|
|
if (is_bad_inode(inode))
|
|
goto out;
|
|
if (NFS_STALE(inode))
|
|
goto out;
|
|
|
|
nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
|
|
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_I(inode)->flags);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
status = nfs_refresh_inode(inode, &fattr);
|
|
if (status) {
|
|
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;
|
|
}
|
|
|
|
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:
|
|
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_in_range_open(jiffies, nfsi->read_cache_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)
|
|
{
|
|
if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
|
|
&& !nfs_attribute_timeout(inode))
|
|
return NFS_STALE(inode) ? -ESTALE : 0;
|
|
return __nfs_revalidate_inode(server, inode);
|
|
}
|
|
|
|
static int nfs_invalidate_mapping_nolock(struct inode *inode, struct address_space *mapping)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
if (mapping->nrpages != 0) {
|
|
int ret = invalidate_inode_pages2(mapping);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
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));
|
|
spin_unlock(&inode->i_lock);
|
|
nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
|
|
nfs_fscache_reset_inode_cookie(inode);
|
|
dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
|
|
inode->i_sb->s_id, (long long)NFS_FILEID(inode));
|
|
return 0;
|
|
}
|
|
|
|
static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
|
|
{
|
|
int ret = 0;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_DATA) {
|
|
ret = nfs_sync_mapping(mapping);
|
|
if (ret == 0)
|
|
ret = nfs_invalidate_mapping_nolock(inode, mapping);
|
|
}
|
|
mutex_unlock(&inode->i_mutex);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nfs_revalidate_mapping_nolock - Revalidate the pagecache
|
|
* @inode - pointer to host inode
|
|
* @mapping - pointer to mapping
|
|
*/
|
|
int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
int ret = 0;
|
|
|
|
if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
|
|
|| nfs_attribute_timeout(inode) || NFS_STALE(inode)) {
|
|
ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
|
|
ret = nfs_invalidate_mapping_nolock(inode, mapping);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nfs_revalidate_mapping - Revalidate the pagecache
|
|
* @inode - pointer to host inode
|
|
* @mapping - pointer to mapping
|
|
*
|
|
* This version of the function will take the inode->i_mutex and attempt to
|
|
* flush out all dirty data if it needs to invalidate the page cache.
|
|
*/
|
|
int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
int ret = 0;
|
|
|
|
if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
|
|
|| nfs_attribute_timeout(inode) || NFS_STALE(inode)) {
|
|
ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
|
|
ret = nfs_invalidate_mapping(inode, mapping);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
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_FATTR_PRECHANGE)
|
|
&& (fattr->valid & NFS_ATTR_FATTR_CHANGE)
|
|
&& nfsi->change_attr == fattr->pre_change_attr) {
|
|
nfsi->change_attr = fattr->change_attr;
|
|
if (S_ISDIR(inode->i_mode))
|
|
nfsi->cache_validity |= NFS_INO_INVALID_DATA;
|
|
}
|
|
/* If we have atomic WCC data, we may update some attributes */
|
|
if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
|
|
&& (fattr->valid & NFS_ATTR_FATTR_CTIME)
|
|
&& timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
|
|
memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
|
|
&& (fattr->valid & NFS_ATTR_FATTR_MTIME)
|
|
&& timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
|
|
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
|
|
if (S_ISDIR(inode->i_mode))
|
|
nfsi->cache_validity |= NFS_INO_INVALID_DATA;
|
|
}
|
|
if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
|
|
&& (fattr->valid & NFS_ATTR_FATTR_SIZE)
|
|
&& i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
|
|
&& nfsi->npages == 0)
|
|
i_size_write(inode, nfs_size_to_loff_t(fattr->size));
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
unsigned long invalid = 0;
|
|
|
|
|
|
/* Has the inode gone and changed behind our back? */
|
|
if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
|
|
return -EIO;
|
|
if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
|
|
return -EIO;
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
|
|
nfsi->change_attr != fattr->change_attr)
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
|
|
|
|
/* Verify a few of the more important attributes */
|
|
if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
|
|
cur_size = i_size_read(inode);
|
|
new_isize = nfs_size_to_loff_t(fattr->size);
|
|
if (cur_size != new_isize && nfsi->npages == 0)
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
|
|
}
|
|
|
|
/* Have any file permissions changed? */
|
|
if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
|
|
invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
|
|
if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && inode->i_uid != fattr->uid)
|
|
invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
|
|
if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && inode->i_gid != fattr->gid)
|
|
invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
|
|
|
|
/* Has the link count changed? */
|
|
if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
|
|
invalid |= NFS_INO_INVALID_ATTR;
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
|
|
invalid |= NFS_INO_INVALID_ATIME;
|
|
|
|
if (invalid != 0)
|
|
nfsi->cache_validity |= invalid;
|
|
|
|
nfsi->read_cache_jiffies = fattr->time_start;
|
|
return 0;
|
|
}
|
|
|
|
static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
|
|
{
|
|
if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
|
|
return 0;
|
|
return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
|
|
}
|
|
|
|
static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
|
|
{
|
|
if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
|
|
return 0;
|
|
return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
|
|
}
|
|
|
|
static atomic_long_t nfs_attr_generation_counter;
|
|
|
|
static unsigned long nfs_read_attr_generation_counter(void)
|
|
{
|
|
return atomic_long_read(&nfs_attr_generation_counter);
|
|
}
|
|
|
|
unsigned long nfs_inc_attr_generation_counter(void)
|
|
{
|
|
return atomic_long_inc_return(&nfs_attr_generation_counter);
|
|
}
|
|
|
|
void nfs_fattr_init(struct nfs_fattr *fattr)
|
|
{
|
|
fattr->valid = 0;
|
|
fattr->time_start = jiffies;
|
|
fattr->gencount = nfs_inc_attr_generation_counter();
|
|
}
|
|
|
|
/**
|
|
* nfs_inode_attrs_need_update - check if the inode attributes need updating
|
|
* @inode - pointer to inode
|
|
* @fattr - attributes
|
|
*
|
|
* Attempt to divine whether or not an RPC call reply carrying stale
|
|
* attributes got scheduled after another call carrying updated ones.
|
|
*
|
|
* To do so, the function first assumes that a more recent ctime means
|
|
* that the attributes in fattr are newer, however it also attempt to
|
|
* catch the case where ctime either didn't change, or went backwards
|
|
* (if someone reset the clock on the server) by looking at whether
|
|
* or not this RPC call was started after the inode was last updated.
|
|
* Note also the check for wraparound of 'attr_gencount'
|
|
*
|
|
* The function returns 'true' if it thinks the attributes in 'fattr' are
|
|
* more recent than the ones cached in the inode.
|
|
*
|
|
*/
|
|
static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
|
|
{
|
|
const struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
|
|
nfs_ctime_need_update(inode, fattr) ||
|
|
nfs_size_need_update(inode, fattr) ||
|
|
((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
|
|
}
|
|
|
|
static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
if (nfs_inode_attrs_need_update(inode, fattr))
|
|
return nfs_update_inode(inode, fattr);
|
|
return nfs_check_inode_attributes(inode, fattr);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int status;
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
|
|
return 0;
|
|
spin_lock(&inode->i_lock);
|
|
status = nfs_refresh_inode_locked(inode, fattr);
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
return status;
|
|
}
|
|
|
|
static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
|
|
if (S_ISDIR(inode->i_mode))
|
|
nfsi->cache_validity |= NFS_INO_INVALID_DATA;
|
|
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
|
|
return 0;
|
|
return nfs_refresh_inode_locked(inode, fattr);
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* NB: if the server didn't return any post op attributes, this
|
|
* function will force the retrieval of attributes before the next
|
|
* NFS request. Thus it should be used only for operations that
|
|
* are expected to change one or more attributes, to avoid
|
|
* unnecessary NFS requests and trips through nfs_update_inode().
|
|
*/
|
|
int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
int status;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
status = nfs_post_op_update_inode_locked(inode, fattr);
|
|
spin_unlock(&inode->i_lock);
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* nfs_post_op_update_inode_force_wcc - 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. Fake up
|
|
* weak cache consistency data, if none exist.
|
|
*
|
|
* This function is mainly designed to be used by the ->write_done() functions.
|
|
*/
|
|
int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
int status;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
/* Don't do a WCC update if these attributes are already stale */
|
|
if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
|
|
!nfs_inode_attrs_need_update(inode, fattr)) {
|
|
fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
|
|
| NFS_ATTR_FATTR_PRESIZE
|
|
| NFS_ATTR_FATTR_PREMTIME
|
|
| NFS_ATTR_FATTR_PRECTIME);
|
|
goto out_noforce;
|
|
}
|
|
if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
|
|
(fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
|
|
fattr->pre_change_attr = NFS_I(inode)->change_attr;
|
|
fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
|
|
}
|
|
if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
|
|
(fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
|
|
memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
|
|
fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
|
|
}
|
|
if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
|
|
(fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
|
|
memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
|
|
fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
|
|
}
|
|
if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
|
|
(fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
|
|
fattr->pre_size = i_size_read(inode);
|
|
fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
|
|
}
|
|
out_noforce:
|
|
status = nfs_post_op_update_inode_locked(inode, fattr);
|
|
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_server *server;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
loff_t cur_isize, new_isize;
|
|
unsigned long invalid = 0;
|
|
unsigned long now = jiffies;
|
|
|
|
dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
|
|
__func__, inode->i_sb->s_id, inode->i_ino,
|
|
atomic_read(&inode->i_count), fattr->valid);
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
|
|
goto out_fileid;
|
|
|
|
/*
|
|
* Make sure the inode's type hasn't changed.
|
|
*/
|
|
if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
|
|
goto out_changed;
|
|
|
|
server = NFS_SERVER(inode);
|
|
/* Update the fsid? */
|
|
if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
|
|
!nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
|
|
!test_bit(NFS_INO_MOUNTPOINT, &nfsi->flags))
|
|
server->fsid = fattr->fsid;
|
|
|
|
/*
|
|
* Update the read time so we don't revalidate too often.
|
|
*/
|
|
nfsi->read_cache_jiffies = fattr->time_start;
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) || (fattr->valid & (NFS_ATTR_FATTR_MTIME|NFS_ATTR_FATTR_CTIME)))
|
|
nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
|
|
| NFS_INO_INVALID_ATIME
|
|
| NFS_INO_REVAL_PAGECACHE);
|
|
|
|
/* Do atomic weak cache consistency updates */
|
|
nfs_wcc_update_inode(inode, fattr);
|
|
|
|
/* More cache consistency checks */
|
|
if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
|
|
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);
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
|
|
if (S_ISDIR(inode->i_mode))
|
|
nfs_force_lookup_revalidate(inode);
|
|
nfsi->change_attr = fattr->change_attr;
|
|
}
|
|
}
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
|
|
/* NFSv2/v3: Check if the mtime agrees */
|
|
if (!timespec_equal(&inode->i_mtime, &fattr->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;
|
|
if (S_ISDIR(inode->i_mode))
|
|
nfs_force_lookup_revalidate(inode);
|
|
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
|
|
}
|
|
}
|
|
if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
|
|
/* If ctime has changed we should definitely clear access+acl caches */
|
|
if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
|
|
/* and probably clear data for a directory too as utimes can cause
|
|
* havoc with our cache.
|
|
*/
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
invalid |= NFS_INO_INVALID_DATA;
|
|
nfs_force_lookup_revalidate(inode);
|
|
}
|
|
memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
|
|
}
|
|
}
|
|
|
|
/* Check if our cached file size is stale */
|
|
if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
|
|
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, or has
|
|
* the file grown beyond our last write? */
|
|
if (nfsi->npages == 0 || new_isize > cur_isize) {
|
|
i_size_write(inode, new_isize);
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
|
|
}
|
|
dprintk("NFS: isize change on server for file %s/%ld\n",
|
|
inode->i_sb->s_id, inode->i_ino);
|
|
}
|
|
}
|
|
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_ATIME)
|
|
memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_MODE) {
|
|
if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
|
|
inode->i_mode = fattr->mode;
|
|
}
|
|
}
|
|
if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
|
|
if (inode->i_uid != fattr->uid) {
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
|
|
inode->i_uid = fattr->uid;
|
|
}
|
|
}
|
|
if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
|
|
if (inode->i_gid != fattr->gid) {
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
|
|
inode->i_gid = fattr->gid;
|
|
}
|
|
}
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
|
|
if (inode->i_nlink != fattr->nlink) {
|
|
invalid |= NFS_INO_INVALID_ATTR;
|
|
if (S_ISDIR(inode->i_mode))
|
|
invalid |= NFS_INO_INVALID_DATA;
|
|
inode->i_nlink = fattr->nlink;
|
|
}
|
|
}
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
|
|
/*
|
|
* report the blocks in 512byte units
|
|
*/
|
|
inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
|
|
}
|
|
if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
|
|
inode->i_blocks = fattr->du.nfs2.blocks;
|
|
|
|
/* 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 = now;
|
|
nfsi->attr_gencount = nfs_inc_attr_generation_counter();
|
|
} else {
|
|
if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
|
|
if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
|
|
nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
|
|
nfsi->attrtimeo_timestamp = now;
|
|
}
|
|
}
|
|
invalid &= ~NFS_INO_INVALID_ATTR;
|
|
/* 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 (!nfs_have_delegation(inode, FMODE_READ) ||
|
|
(nfsi->cache_validity & NFS_INO_REVAL_FORCED))
|
|
nfsi->cache_validity |= invalid;
|
|
nfsi->cache_validity &= ~NFS_INO_REVAL_FORCED;
|
|
|
|
return 0;
|
|
out_changed:
|
|
/*
|
|
* Big trouble! The inode has become a different object.
|
|
*/
|
|
printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
|
|
__func__, inode->i_ino, inode->i_mode, fattr->mode);
|
|
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)->nfs_client->cl_hostname, inode->i_sb->s_id,
|
|
(long long)nfsi->fileid, (long long)fattr->fileid);
|
|
goto out_err;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_NFS_V4
|
|
|
|
/*
|
|
* 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().
|
|
*/
|
|
void nfs4_clear_inode(struct inode *inode)
|
|
{
|
|
/* If we are holding a delegation, return it! */
|
|
nfs_inode_return_delegation_noreclaim(inode);
|
|
/* First call standard NFS clear_inode() code */
|
|
nfs_clear_inode(inode);
|
|
}
|
|
#endif
|
|
|
|
struct inode *nfs_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct nfs_inode *nfsi;
|
|
nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
|
|
if (!nfsi)
|
|
return NULL;
|
|
nfsi->flags = 0UL;
|
|
nfsi->cache_validity = 0UL;
|
|
#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;
|
|
}
|
|
|
|
void nfs_destroy_inode(struct inode *inode)
|
|
{
|
|
kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
|
|
}
|
|
|
|
static inline void nfs4_init_once(struct nfs_inode *nfsi)
|
|
{
|
|
#ifdef CONFIG_NFS_V4
|
|
INIT_LIST_HEAD(&nfsi->open_states);
|
|
nfsi->delegation = NULL;
|
|
nfsi->delegation_state = 0;
|
|
init_rwsem(&nfsi->rwsem);
|
|
#endif
|
|
}
|
|
|
|
static void init_once(void *foo)
|
|
{
|
|
struct nfs_inode *nfsi = (struct nfs_inode *) foo;
|
|
|
|
inode_init_once(&nfsi->vfs_inode);
|
|
INIT_LIST_HEAD(&nfsi->open_files);
|
|
INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
|
|
INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
|
|
INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
|
|
nfsi->npages = 0;
|
|
atomic_set(&nfsi->silly_count, 1);
|
|
INIT_HLIST_HEAD(&nfsi->silly_list);
|
|
init_waitqueue_head(&nfsi->waitqueue);
|
|
nfs4_init_once(nfsi);
|
|
}
|
|
|
|
static int __init nfs_init_inodecache(void)
|
|
{
|
|
nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
|
|
sizeof(struct nfs_inode),
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD),
|
|
init_once);
|
|
if (nfs_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nfs_destroy_inodecache(void)
|
|
{
|
|
kmem_cache_destroy(nfs_inode_cachep);
|
|
}
|
|
|
|
struct workqueue_struct *nfsiod_workqueue;
|
|
|
|
/*
|
|
* start up the nfsiod workqueue
|
|
*/
|
|
static int nfsiod_start(void)
|
|
{
|
|
struct workqueue_struct *wq;
|
|
dprintk("RPC: creating workqueue nfsiod\n");
|
|
wq = create_singlethread_workqueue("nfsiod");
|
|
if (wq == NULL)
|
|
return -ENOMEM;
|
|
nfsiod_workqueue = wq;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Destroy the nfsiod workqueue
|
|
*/
|
|
static void nfsiod_stop(void)
|
|
{
|
|
struct workqueue_struct *wq;
|
|
|
|
wq = nfsiod_workqueue;
|
|
if (wq == NULL)
|
|
return;
|
|
nfsiod_workqueue = NULL;
|
|
destroy_workqueue(wq);
|
|
}
|
|
|
|
/*
|
|
* Initialize NFS
|
|
*/
|
|
static int __init init_nfs_fs(void)
|
|
{
|
|
int err;
|
|
|
|
err = nfs_fscache_register();
|
|
if (err < 0)
|
|
goto out7;
|
|
|
|
err = nfsiod_start();
|
|
if (err)
|
|
goto out6;
|
|
|
|
err = nfs_fs_proc_init();
|
|
if (err)
|
|
goto out5;
|
|
|
|
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;
|
|
|
|
err = nfs_init_directcache();
|
|
if (err)
|
|
goto out0;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
rpc_proc_register(&nfs_rpcstat);
|
|
#endif
|
|
if ((err = register_nfs_fs()) != 0)
|
|
goto out;
|
|
return 0;
|
|
out:
|
|
#ifdef CONFIG_PROC_FS
|
|
rpc_proc_unregister("nfs");
|
|
#endif
|
|
nfs_destroy_directcache();
|
|
out0:
|
|
nfs_destroy_writepagecache();
|
|
out1:
|
|
nfs_destroy_readpagecache();
|
|
out2:
|
|
nfs_destroy_inodecache();
|
|
out3:
|
|
nfs_destroy_nfspagecache();
|
|
out4:
|
|
nfs_fs_proc_exit();
|
|
out5:
|
|
nfsiod_stop();
|
|
out6:
|
|
nfs_fscache_unregister();
|
|
out7:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_nfs_fs(void)
|
|
{
|
|
nfs_destroy_directcache();
|
|
nfs_destroy_writepagecache();
|
|
nfs_destroy_readpagecache();
|
|
nfs_destroy_inodecache();
|
|
nfs_destroy_nfspagecache();
|
|
nfs_fscache_unregister();
|
|
#ifdef CONFIG_PROC_FS
|
|
rpc_proc_unregister("nfs");
|
|
#endif
|
|
unregister_nfs_fs();
|
|
nfs_fs_proc_exit();
|
|
nfsiod_stop();
|
|
}
|
|
|
|
/* 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)
|
|
|