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2348 lines
64 KiB
2348 lines
64 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]>, 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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* [email protected] |
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* |
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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/signal.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/seq_file.h> |
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#include <linux/mount.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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#include <linux/slab.h> |
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#include <linux/compat.h> |
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#include <linux/freezer.h> |
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#include <linux/uaccess.h> |
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#include <linux/iversion.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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#include "pnfs.h" |
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#include "nfs.h" |
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#include "netns.h" |
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#include "sysfs.h" |
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|
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#include "nfstrace.h" |
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|
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#define NFSDBG_FACILITY NFSDBG_VFS |
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|
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#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 |
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|
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/* Default is to see 64-bit inode numbers */ |
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static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; |
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|
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static int nfs_update_inode(struct inode *, struct nfs_fattr *); |
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|
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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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static int nfs_wait_killable(int mode) |
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{ |
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freezable_schedule_unsafe(); |
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if (signal_pending_state(mode, current)) |
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return -ERESTARTSYS; |
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return 0; |
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} |
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|
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int nfs_wait_bit_killable(struct wait_bit_key *key, int mode) |
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{ |
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return nfs_wait_killable(mode); |
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} |
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EXPORT_SYMBOL_GPL(nfs_wait_bit_killable); |
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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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#ifdef CONFIG_COMPAT |
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compat_ulong_t ino; |
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#else |
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unsigned long ino; |
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#endif |
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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_drop_inode(struct inode *inode) |
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{ |
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return NFS_STALE(inode) || generic_drop_inode(inode); |
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} |
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EXPORT_SYMBOL_GPL(nfs_drop_inode); |
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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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WARN_ON_ONCE(nfs_have_writebacks(inode)); |
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WARN_ON_ONCE(!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_clear_inode(inode); |
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} |
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EXPORT_SYMBOL_GPL(nfs_clear_inode); |
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|
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void nfs_evict_inode(struct inode *inode) |
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{ |
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truncate_inode_pages_final(&inode->i_data); |
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clear_inode(inode); |
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nfs_clear_inode(inode); |
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} |
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|
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int nfs_sync_inode(struct inode *inode) |
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{ |
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inode_dio_wait(inode); |
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return nfs_wb_all(inode); |
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} |
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EXPORT_SYMBOL_GPL(nfs_sync_inode); |
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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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* @mapping: pointer to struct address_space |
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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 = 0; |
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|
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if (mapping->nrpages != 0) { |
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unmap_mapping_range(mapping, 0, 0, 0); |
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ret = nfs_wb_all(mapping->host); |
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} |
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return ret; |
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} |
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|
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static int nfs_attribute_timeout(struct inode *inode) |
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{ |
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struct nfs_inode *nfsi = NFS_I(inode); |
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|
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return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); |
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} |
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|
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static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags) |
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{ |
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unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); |
|
|
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/* Special case for the pagecache or access cache */ |
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if (flags == NFS_INO_REVAL_PAGECACHE && |
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!(cache_validity & NFS_INO_REVAL_FORCED)) |
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return false; |
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return (cache_validity & flags) != 0; |
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} |
|
|
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static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags) |
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{ |
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unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); |
|
|
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if ((cache_validity & flags) != 0) |
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return true; |
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if (nfs_attribute_timeout(inode)) |
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return true; |
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return false; |
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} |
|
|
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bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags) |
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{ |
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if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) |
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return nfs_check_cache_invalid_delegated(inode, flags); |
|
|
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return nfs_check_cache_invalid_not_delegated(inode, flags); |
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} |
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EXPORT_SYMBOL_GPL(nfs_check_cache_invalid); |
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|
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#ifdef CONFIG_NFS_V4_2 |
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static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi) |
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{ |
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return nfsi->xattr_cache != NULL; |
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} |
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#else |
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static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi) |
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{ |
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return false; |
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} |
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#endif |
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|
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void nfs_set_cache_invalid(struct inode *inode, unsigned long flags) |
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{ |
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struct nfs_inode *nfsi = NFS_I(inode); |
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bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ); |
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|
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if (have_delegation) { |
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if (!(flags & NFS_INO_REVAL_FORCED)) |
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flags &= ~NFS_INO_INVALID_OTHER; |
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flags &= ~(NFS_INO_INVALID_CHANGE |
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| NFS_INO_INVALID_SIZE |
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| NFS_INO_REVAL_PAGECACHE |
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| NFS_INO_INVALID_XATTR); |
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} else if (flags & NFS_INO_REVAL_PAGECACHE) |
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flags |= NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE; |
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|
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if (!nfs_has_xattr_cache(nfsi)) |
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flags &= ~NFS_INO_INVALID_XATTR; |
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if (flags & NFS_INO_INVALID_DATA) |
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nfs_fscache_invalidate(inode); |
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if (inode->i_mapping->nrpages == 0) |
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flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER); |
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nfsi->cache_validity |= flags; |
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} |
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EXPORT_SYMBOL_GPL(nfs_set_cache_invalid); |
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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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|
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nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); |
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|
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nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
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nfsi->attrtimeo_timestamp = jiffies; |
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|
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if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { |
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nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
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| NFS_INO_INVALID_DATA |
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| NFS_INO_INVALID_ACCESS |
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| NFS_INO_INVALID_ACL |
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| NFS_INO_INVALID_XATTR |
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| NFS_INO_REVAL_PAGECACHE); |
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} else |
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nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
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| NFS_INO_INVALID_ACCESS |
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| NFS_INO_INVALID_ACL |
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| NFS_INO_INVALID_XATTR |
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| NFS_INO_REVAL_PAGECACHE); |
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nfs_zap_label_cache_locked(nfsi); |
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} |
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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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|
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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_set_cache_invalid(inode, 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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|
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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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|
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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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EXPORT_SYMBOL_GPL(nfs_zap_acl_cache); |
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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_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); |
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spin_unlock(&inode->i_lock); |
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} |
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EXPORT_SYMBOL_GPL(nfs_invalidate_atime); |
|
|
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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_set_inode_stale_locked(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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trace_nfs_set_inode_stale(inode); |
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} |
|
|
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void nfs_set_inode_stale(struct inode *inode) |
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{ |
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spin_lock(&inode->i_lock); |
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nfs_set_inode_stale_locked(inode); |
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spin_unlock(&inode->i_lock); |
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} |
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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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/* |
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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 ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode)) |
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return 0; |
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if (nfs_compare_fh(NFS_FH(inode), fh)) |
|
return 0; |
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if (is_bad_inode(inode) || NFS_STALE(inode)) |
|
return 0; |
|
return 1; |
|
} |
|
|
|
static int |
|
nfs_init_locked(struct inode *inode, void *opaque) |
|
{ |
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struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; |
|
struct nfs_fattr *fattr = desc->fattr; |
|
|
|
set_nfs_fileid(inode, fattr->fileid); |
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inode->i_mode = fattr->mode; |
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nfs_copy_fh(NFS_FH(inode), desc->fh); |
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_NFS_V4_SECURITY_LABEL |
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static void nfs_clear_label_invalid(struct inode *inode) |
|
{ |
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spin_lock(&inode->i_lock); |
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NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL; |
|
spin_unlock(&inode->i_lock); |
|
} |
|
|
|
void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, |
|
struct nfs4_label *label) |
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{ |
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int error; |
|
|
|
if (label == NULL) |
|
return; |
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) { |
|
error = security_inode_notifysecctx(inode, label->label, |
|
label->len); |
|
if (error) |
|
printk(KERN_ERR "%s() %s %d " |
|
"security_inode_notifysecctx() %d\n", |
|
__func__, |
|
(char *)label->label, |
|
label->len, error); |
|
nfs_clear_label_invalid(inode); |
|
} |
|
} |
|
|
|
struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) |
|
{ |
|
struct nfs4_label *label = NULL; |
|
int minor_version = server->nfs_client->cl_minorversion; |
|
|
|
if (minor_version < 2) |
|
return label; |
|
|
|
if (!(server->caps & NFS_CAP_SECURITY_LABEL)) |
|
return label; |
|
|
|
label = kzalloc(sizeof(struct nfs4_label), flags); |
|
if (label == NULL) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
label->label = kzalloc(NFS4_MAXLABELLEN, flags); |
|
if (label->label == NULL) { |
|
kfree(label); |
|
return ERR_PTR(-ENOMEM); |
|
} |
|
label->len = NFS4_MAXLABELLEN; |
|
|
|
return label; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs4_label_alloc); |
|
#else |
|
void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, |
|
struct nfs4_label *label) |
|
{ |
|
} |
|
#endif |
|
EXPORT_SYMBOL_GPL(nfs_setsecurity); |
|
|
|
/* Search for inode identified by fh, fileid and i_mode in inode cache. */ |
|
struct inode * |
|
nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh) |
|
{ |
|
struct nfs_find_desc desc = { |
|
.fh = fh, |
|
.fattr = fattr, |
|
}; |
|
struct inode *inode; |
|
unsigned long hash; |
|
|
|
if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) || |
|
!(fattr->valid & NFS_ATTR_FATTR_TYPE)) |
|
return NULL; |
|
|
|
hash = nfs_fattr_to_ino_t(fattr); |
|
inode = ilookup5(sb, hash, nfs_find_actor, &desc); |
|
|
|
dprintk("%s: returning %p\n", __func__, inode); |
|
return inode; |
|
} |
|
|
|
/* |
|
* 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 nfs4_label *label) |
|
{ |
|
struct nfs_find_desc desc = { |
|
.fh = fh, |
|
.fattr = fattr |
|
}; |
|
struct inode *inode = ERR_PTR(-ENOENT); |
|
unsigned long hash; |
|
|
|
nfs_attr_check_mountpoint(sb, fattr); |
|
|
|
if (nfs_attr_use_mounted_on_fileid(fattr)) |
|
fattr->fileid = fattr->mounted_on_fileid; |
|
else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) |
|
goto out_no_inode; |
|
if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0) |
|
goto out_no_inode; |
|
|
|
hash = nfs_fattr_to_ino_t(fattr); |
|
|
|
inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); |
|
if (inode == NULL) { |
|
inode = ERR_PTR(-ENOMEM); |
|
goto out_no_inode; |
|
} |
|
|
|
if (inode->i_state & I_NEW) { |
|
struct nfs_inode *nfsi = NFS_I(inode); |
|
unsigned long now = jiffies; |
|
|
|
/* 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; |
|
nfsi->cache_validity = 0; |
|
if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 |
|
&& nfs_server_capable(inode, NFS_CAP_MODE)) |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); |
|
/* 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)->nfs_client->rpc_ops->file_inode_ops; |
|
if (S_ISREG(inode->i_mode)) { |
|
inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops; |
|
inode->i_data.a_ops = &nfs_file_aops; |
|
} else if (S_ISDIR(inode->i_mode)) { |
|
inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; |
|
inode->i_fop = &nfs_dir_operations; |
|
inode->i_data.a_ops = &nfs_dir_aops; |
|
/* Deal with crossing mountpoints */ |
|
if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT || |
|
fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { |
|
if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) |
|
inode->i_op = &nfs_referral_inode_operations; |
|
else |
|
inode->i_op = &nfs_mountpoint_inode_operations; |
|
inode->i_fop = NULL; |
|
inode->i_flags |= S_AUTOMOUNT; |
|
} |
|
} else if (S_ISLNK(inode->i_mode)) { |
|
inode->i_op = &nfs_symlink_inode_operations; |
|
inode_nohighmem(inode); |
|
} 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)); |
|
inode_set_iversion_raw(inode, 0); |
|
inode->i_size = 0; |
|
clear_nlink(inode); |
|
inode->i_uid = make_kuid(&init_user_ns, -2); |
|
inode->i_gid = make_kgid(&init_user_ns, -2); |
|
inode->i_blocks = 0; |
|
memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); |
|
nfsi->write_io = 0; |
|
nfsi->read_io = 0; |
|
|
|
nfsi->read_cache_jiffies = fattr->time_start; |
|
nfsi->attr_gencount = fattr->gencount; |
|
if (fattr->valid & NFS_ATTR_FATTR_ATIME) |
|
inode->i_atime = fattr->atime; |
|
else if (nfs_server_capable(inode, NFS_CAP_ATIME)) |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); |
|
if (fattr->valid & NFS_ATTR_FATTR_MTIME) |
|
inode->i_mtime = fattr->mtime; |
|
else if (nfs_server_capable(inode, NFS_CAP_MTIME)) |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); |
|
if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
|
inode->i_ctime = fattr->ctime; |
|
else if (nfs_server_capable(inode, NFS_CAP_CTIME)) |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME); |
|
if (fattr->valid & NFS_ATTR_FATTR_CHANGE) |
|
inode_set_iversion_raw(inode, fattr->change_attr); |
|
else |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE); |
|
if (fattr->valid & NFS_ATTR_FATTR_SIZE) |
|
inode->i_size = nfs_size_to_loff_t(fattr->size); |
|
else |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE); |
|
if (fattr->valid & NFS_ATTR_FATTR_NLINK) |
|
set_nlink(inode, fattr->nlink); |
|
else if (nfs_server_capable(inode, NFS_CAP_NLINK)) |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); |
|
if (fattr->valid & NFS_ATTR_FATTR_OWNER) |
|
inode->i_uid = fattr->uid; |
|
else if (nfs_server_capable(inode, NFS_CAP_OWNER)) |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); |
|
if (fattr->valid & NFS_ATTR_FATTR_GROUP) |
|
inode->i_gid = fattr->gid; |
|
else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP)) |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); |
|
if (nfs_server_capable(inode, NFS_CAP_XATTR)) |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR); |
|
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); |
|
} |
|
|
|
if (nfsi->cache_validity != 0) |
|
nfsi->cache_validity |= NFS_INO_REVAL_FORCED; |
|
|
|
nfs_setsecurity(inode, fattr, label); |
|
|
|
nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
|
nfsi->attrtimeo_timestamp = now; |
|
nfsi->access_cache = RB_ROOT; |
|
|
|
nfs_fscache_init_inode(inode); |
|
|
|
unlock_new_inode(inode); |
|
} else { |
|
int err = nfs_refresh_inode(inode, fattr); |
|
if (err < 0) { |
|
iput(inode); |
|
inode = ERR_PTR(err); |
|
goto out_no_inode; |
|
} |
|
} |
|
dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n", |
|
inode->i_sb->s_id, |
|
(unsigned long long)NFS_FILEID(inode), |
|
nfs_display_fhandle_hash(fh), |
|
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; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_fhget); |
|
|
|
#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN) |
|
|
|
int |
|
nfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, |
|
struct iattr *attr) |
|
{ |
|
struct inode *inode = d_inode(dentry); |
|
struct nfs_fattr *fattr; |
|
int error = 0; |
|
|
|
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) { |
|
BUG_ON(!S_ISREG(inode->i_mode)); |
|
|
|
error = inode_newsize_ok(inode, attr->ia_size); |
|
if (error) |
|
return error; |
|
|
|
if (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|ATTR_OPEN)) == 0) |
|
return 0; |
|
|
|
trace_nfs_setattr_enter(inode); |
|
|
|
/* Write all dirty data */ |
|
if (S_ISREG(inode->i_mode)) |
|
nfs_sync_inode(inode); |
|
|
|
fattr = nfs_alloc_fattr(); |
|
if (fattr == NULL) { |
|
error = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); |
|
if (error == 0) |
|
error = nfs_refresh_inode(inode, fattr); |
|
nfs_free_fattr(fattr); |
|
out: |
|
trace_nfs_setattr_exit(inode, error); |
|
return error; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_setattr); |
|
|
|
/** |
|
* 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. |
|
* Note: must be called with inode->i_lock held! |
|
*/ |
|
static int nfs_vmtruncate(struct inode * inode, loff_t offset) |
|
{ |
|
int err; |
|
|
|
err = inode_newsize_ok(inode, offset); |
|
if (err) |
|
goto out; |
|
|
|
i_size_write(inode, offset); |
|
/* Optimisation */ |
|
if (offset == 0) |
|
NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA | |
|
NFS_INO_DATA_INVAL_DEFER); |
|
NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE; |
|
|
|
spin_unlock(&inode->i_lock); |
|
truncate_pagecache(inode, offset); |
|
spin_lock(&inode->i_lock); |
|
out: |
|
return err; |
|
} |
|
|
|
/** |
|
* nfs_setattr_update_inode - Update inode metadata after a setattr call. |
|
* @inode: pointer to struct inode |
|
* @attr: pointer to struct iattr |
|
* @fattr: pointer to struct nfs_fattr |
|
* |
|
* 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, |
|
struct nfs_fattr *fattr) |
|
{ |
|
/* Barrier: bump the attribute generation count. */ |
|
nfs_fattr_set_barrier(fattr); |
|
|
|
spin_lock(&inode->i_lock); |
|
NFS_I(inode)->attr_gencount = fattr->gencount; |
|
if ((attr->ia_valid & ATTR_SIZE) != 0) { |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); |
|
nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); |
|
nfs_vmtruncate(inode, attr->ia_size); |
|
} |
|
if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { |
|
NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME; |
|
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; |
|
if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
|
inode->i_ctime = fattr->ctime; |
|
else |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
|
| NFS_INO_INVALID_CTIME); |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS |
|
| NFS_INO_INVALID_ACL); |
|
} |
|
if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) { |
|
NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME |
|
| NFS_INO_INVALID_CTIME); |
|
if (fattr->valid & NFS_ATTR_FATTR_ATIME) |
|
inode->i_atime = fattr->atime; |
|
else if (attr->ia_valid & ATTR_ATIME_SET) |
|
inode->i_atime = attr->ia_atime; |
|
else |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); |
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
|
inode->i_ctime = fattr->ctime; |
|
else |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
|
| NFS_INO_INVALID_CTIME); |
|
} |
|
if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) { |
|
NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME |
|
| NFS_INO_INVALID_CTIME); |
|
if (fattr->valid & NFS_ATTR_FATTR_MTIME) |
|
inode->i_mtime = fattr->mtime; |
|
else if (attr->ia_valid & ATTR_MTIME_SET) |
|
inode->i_mtime = attr->ia_mtime; |
|
else |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); |
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
|
inode->i_ctime = fattr->ctime; |
|
else |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
|
| NFS_INO_INVALID_CTIME); |
|
} |
|
if (fattr->valid) |
|
nfs_update_inode(inode, fattr); |
|
spin_unlock(&inode->i_lock); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_setattr_update_inode); |
|
|
|
static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry) |
|
{ |
|
struct dentry *parent; |
|
|
|
if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS)) |
|
return; |
|
parent = dget_parent(dentry); |
|
nfs_force_use_readdirplus(d_inode(parent)); |
|
dput(parent); |
|
} |
|
|
|
static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry) |
|
{ |
|
struct dentry *parent; |
|
|
|
if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS)) |
|
return; |
|
parent = dget_parent(dentry); |
|
nfs_advise_use_readdirplus(d_inode(parent)); |
|
dput(parent); |
|
} |
|
|
|
static bool nfs_need_revalidate_inode(struct inode *inode) |
|
{ |
|
if (NFS_I(inode)->cache_validity & |
|
(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) |
|
return true; |
|
if (nfs_attribute_cache_expired(inode)) |
|
return true; |
|
return false; |
|
} |
|
|
|
int nfs_getattr(struct user_namespace *mnt_userns, const struct path *path, |
|
struct kstat *stat, u32 request_mask, unsigned int query_flags) |
|
{ |
|
struct inode *inode = d_inode(path->dentry); |
|
struct nfs_server *server = NFS_SERVER(inode); |
|
unsigned long cache_validity; |
|
int err = 0; |
|
bool force_sync = query_flags & AT_STATX_FORCE_SYNC; |
|
bool do_update = false; |
|
|
|
trace_nfs_getattr_enter(inode); |
|
|
|
if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) { |
|
nfs_readdirplus_parent_cache_hit(path->dentry); |
|
goto out_no_update; |
|
} |
|
|
|
/* Flush out writes to the server in order to update c/mtime. */ |
|
if ((request_mask & (STATX_CTIME|STATX_MTIME)) && |
|
S_ISREG(inode->i_mode)) { |
|
err = filemap_write_and_wait(inode->i_mapping); |
|
if (err) |
|
goto out; |
|
} |
|
|
|
/* |
|
* 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 SB_NOATIME or SB_NODIRATIME so there is |
|
* no point in checking those. |
|
*/ |
|
if ((path->mnt->mnt_flags & MNT_NOATIME) || |
|
((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) |
|
request_mask &= ~STATX_ATIME; |
|
|
|
/* Is the user requesting attributes that might need revalidation? */ |
|
if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME| |
|
STATX_MTIME|STATX_UID|STATX_GID| |
|
STATX_SIZE|STATX_BLOCKS))) |
|
goto out_no_revalidate; |
|
|
|
/* Check whether the cached attributes are stale */ |
|
do_update |= force_sync || nfs_attribute_cache_expired(inode); |
|
cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); |
|
do_update |= cache_validity & |
|
(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL); |
|
if (request_mask & STATX_ATIME) |
|
do_update |= cache_validity & NFS_INO_INVALID_ATIME; |
|
if (request_mask & (STATX_CTIME|STATX_MTIME)) |
|
do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE; |
|
if (request_mask & STATX_BLOCKS) |
|
do_update |= cache_validity & NFS_INO_INVALID_BLOCKS; |
|
if (do_update) { |
|
/* Update the attribute cache */ |
|
if (!(server->flags & NFS_MOUNT_NOAC)) |
|
nfs_readdirplus_parent_cache_miss(path->dentry); |
|
else |
|
nfs_readdirplus_parent_cache_hit(path->dentry); |
|
err = __nfs_revalidate_inode(server, inode); |
|
if (err) |
|
goto out; |
|
} else |
|
nfs_readdirplus_parent_cache_hit(path->dentry); |
|
out_no_revalidate: |
|
/* Only return attributes that were revalidated. */ |
|
stat->result_mask &= request_mask; |
|
out_no_update: |
|
generic_fillattr(&init_user_ns, inode, stat); |
|
stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); |
|
if (S_ISDIR(inode->i_mode)) |
|
stat->blksize = NFS_SERVER(inode)->dtsize; |
|
out: |
|
trace_nfs_getattr_exit(inode, err); |
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_getattr); |
|
|
|
static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) |
|
{ |
|
refcount_set(&l_ctx->count, 1); |
|
l_ctx->lockowner = current->files; |
|
INIT_LIST_HEAD(&l_ctx->list); |
|
atomic_set(&l_ctx->io_count, 0); |
|
} |
|
|
|
static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) |
|
{ |
|
struct nfs_lock_context *pos; |
|
|
|
list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) { |
|
if (pos->lockowner != current->files) |
|
continue; |
|
if (refcount_inc_not_zero(&pos->count)) |
|
return pos; |
|
} |
|
return NULL; |
|
} |
|
|
|
struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) |
|
{ |
|
struct nfs_lock_context *res, *new = NULL; |
|
struct inode *inode = d_inode(ctx->dentry); |
|
|
|
rcu_read_lock(); |
|
res = __nfs_find_lock_context(ctx); |
|
rcu_read_unlock(); |
|
if (res == NULL) { |
|
new = kmalloc(sizeof(*new), GFP_KERNEL); |
|
if (new == NULL) |
|
return ERR_PTR(-ENOMEM); |
|
nfs_init_lock_context(new); |
|
spin_lock(&inode->i_lock); |
|
res = __nfs_find_lock_context(ctx); |
|
if (res == NULL) { |
|
new->open_context = get_nfs_open_context(ctx); |
|
if (new->open_context) { |
|
list_add_tail_rcu(&new->list, |
|
&ctx->lock_context.list); |
|
res = new; |
|
new = NULL; |
|
} else |
|
res = ERR_PTR(-EBADF); |
|
} |
|
spin_unlock(&inode->i_lock); |
|
kfree(new); |
|
} |
|
return res; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_get_lock_context); |
|
|
|
void nfs_put_lock_context(struct nfs_lock_context *l_ctx) |
|
{ |
|
struct nfs_open_context *ctx = l_ctx->open_context; |
|
struct inode *inode = d_inode(ctx->dentry); |
|
|
|
if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock)) |
|
return; |
|
list_del_rcu(&l_ctx->list); |
|
spin_unlock(&inode->i_lock); |
|
put_nfs_open_context(ctx); |
|
kfree_rcu(l_ctx, rcu_head); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_put_lock_context); |
|
|
|
/** |
|
* nfs_close_context - Common close_context() routine NFSv2/v3 |
|
* @ctx: pointer to context |
|
* @is_sync: is this a synchronous close |
|
* |
|
* Ensure that the attributes are up to date if we're mounted |
|
* with close-to-open semantics and we have cached data that will |
|
* need to be revalidated on open. |
|
*/ |
|
void nfs_close_context(struct nfs_open_context *ctx, int is_sync) |
|
{ |
|
struct nfs_inode *nfsi; |
|
struct inode *inode; |
|
struct nfs_server *server; |
|
|
|
if (!(ctx->mode & FMODE_WRITE)) |
|
return; |
|
if (!is_sync) |
|
return; |
|
inode = d_inode(ctx->dentry); |
|
if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) |
|
return; |
|
nfsi = NFS_I(inode); |
|
if (inode->i_mapping->nrpages == 0) |
|
return; |
|
if (nfsi->cache_validity & NFS_INO_INVALID_DATA) |
|
return; |
|
if (!list_empty(&nfsi->open_files)) |
|
return; |
|
server = NFS_SERVER(inode); |
|
if (server->flags & NFS_MOUNT_NOCTO) |
|
return; |
|
nfs_revalidate_inode(server, inode); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_close_context); |
|
|
|
struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, |
|
fmode_t f_mode, |
|
struct file *filp) |
|
{ |
|
struct nfs_open_context *ctx; |
|
|
|
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); |
|
if (!ctx) |
|
return ERR_PTR(-ENOMEM); |
|
nfs_sb_active(dentry->d_sb); |
|
ctx->dentry = dget(dentry); |
|
if (filp) |
|
ctx->cred = get_cred(filp->f_cred); |
|
else |
|
ctx->cred = get_current_cred(); |
|
ctx->ll_cred = NULL; |
|
ctx->state = NULL; |
|
ctx->mode = f_mode; |
|
ctx->flags = 0; |
|
ctx->error = 0; |
|
ctx->flock_owner = (fl_owner_t)filp; |
|
nfs_init_lock_context(&ctx->lock_context); |
|
ctx->lock_context.open_context = ctx; |
|
INIT_LIST_HEAD(&ctx->list); |
|
ctx->mdsthreshold = NULL; |
|
return ctx; |
|
} |
|
EXPORT_SYMBOL_GPL(alloc_nfs_open_context); |
|
|
|
struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) |
|
{ |
|
if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count)) |
|
return ctx; |
|
return NULL; |
|
} |
|
EXPORT_SYMBOL_GPL(get_nfs_open_context); |
|
|
|
static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) |
|
{ |
|
struct inode *inode = d_inode(ctx->dentry); |
|
struct super_block *sb = ctx->dentry->d_sb; |
|
|
|
if (!refcount_dec_and_test(&ctx->lock_context.count)) |
|
return; |
|
if (!list_empty(&ctx->list)) { |
|
spin_lock(&inode->i_lock); |
|
list_del_rcu(&ctx->list); |
|
spin_unlock(&inode->i_lock); |
|
} |
|
if (inode != NULL) |
|
NFS_PROTO(inode)->close_context(ctx, is_sync); |
|
put_cred(ctx->cred); |
|
dput(ctx->dentry); |
|
nfs_sb_deactive(sb); |
|
put_rpccred(ctx->ll_cred); |
|
kfree(ctx->mdsthreshold); |
|
kfree_rcu(ctx, rcu_head); |
|
} |
|
|
|
void put_nfs_open_context(struct nfs_open_context *ctx) |
|
{ |
|
__put_nfs_open_context(ctx, 0); |
|
} |
|
EXPORT_SYMBOL_GPL(put_nfs_open_context); |
|
|
|
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 |
|
*/ |
|
void nfs_inode_attach_open_context(struct nfs_open_context *ctx) |
|
{ |
|
struct inode *inode = d_inode(ctx->dentry); |
|
struct nfs_inode *nfsi = NFS_I(inode); |
|
|
|
spin_lock(&inode->i_lock); |
|
if (list_empty(&nfsi->open_files) && |
|
(nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)) |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA | |
|
NFS_INO_REVAL_FORCED); |
|
list_add_tail_rcu(&ctx->list, &nfsi->open_files); |
|
spin_unlock(&inode->i_lock); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); |
|
|
|
void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) |
|
{ |
|
filp->private_data = get_nfs_open_context(ctx); |
|
if (list_empty(&ctx->list)) |
|
nfs_inode_attach_open_context(ctx); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_file_set_open_context); |
|
|
|
/* |
|
* Given an inode, search for an open context with the desired characteristics |
|
*/ |
|
struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode) |
|
{ |
|
struct nfs_inode *nfsi = NFS_I(inode); |
|
struct nfs_open_context *pos, *ctx = NULL; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(pos, &nfsi->open_files, list) { |
|
if (cred != NULL && cred_fscmp(pos->cred, cred) != 0) |
|
continue; |
|
if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) |
|
continue; |
|
ctx = get_nfs_open_context(pos); |
|
if (ctx) |
|
break; |
|
} |
|
rcu_read_unlock(); |
|
return ctx; |
|
} |
|
|
|
void nfs_file_clear_open_context(struct file *filp) |
|
{ |
|
struct nfs_open_context *ctx = nfs_file_open_context(filp); |
|
|
|
if (ctx) { |
|
struct inode *inode = d_inode(ctx->dentry); |
|
|
|
/* |
|
* We fatal error on write before. Try to writeback |
|
* every page again. |
|
*/ |
|
if (ctx->error < 0) |
|
invalidate_inode_pages2(inode->i_mapping); |
|
filp->private_data = NULL; |
|
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; |
|
|
|
ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp); |
|
if (IS_ERR(ctx)) |
|
return PTR_ERR(ctx); |
|
nfs_file_set_open_context(filp, ctx); |
|
put_nfs_open_context(ctx); |
|
nfs_fscache_open_file(inode, filp); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_open); |
|
|
|
/* |
|
* 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 nfs4_label *label = NULL; |
|
struct nfs_fattr *fattr = NULL; |
|
struct nfs_inode *nfsi = NFS_I(inode); |
|
|
|
dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n", |
|
inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode)); |
|
|
|
trace_nfs_revalidate_inode_enter(inode); |
|
|
|
if (is_bad_inode(inode)) |
|
goto out; |
|
if (NFS_STALE(inode)) |
|
goto out; |
|
|
|
/* pNFS: Attributes aren't updated until we layoutcommit */ |
|
if (S_ISREG(inode->i_mode)) { |
|
status = pnfs_sync_inode(inode, false); |
|
if (status) |
|
goto out; |
|
} |
|
|
|
status = -ENOMEM; |
|
fattr = nfs_alloc_fattr(); |
|
if (fattr == NULL) |
|
goto out; |
|
|
|
nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); |
|
|
|
label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); |
|
if (IS_ERR(label)) { |
|
status = PTR_ERR(label); |
|
goto out; |
|
} |
|
|
|
status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, |
|
label, inode); |
|
if (status != 0) { |
|
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n", |
|
inode->i_sb->s_id, |
|
(unsigned long long)NFS_FILEID(inode), status); |
|
switch (status) { |
|
case -ETIMEDOUT: |
|
/* A soft timeout occurred. Use cached information? */ |
|
if (server->flags & NFS_MOUNT_SOFTREVAL) |
|
status = 0; |
|
break; |
|
case -ESTALE: |
|
if (!S_ISDIR(inode->i_mode)) |
|
nfs_set_inode_stale(inode); |
|
else |
|
nfs_zap_caches(inode); |
|
} |
|
goto err_out; |
|
} |
|
|
|
status = nfs_refresh_inode(inode, fattr); |
|
if (status) { |
|
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n", |
|
inode->i_sb->s_id, |
|
(unsigned long long)NFS_FILEID(inode), status); |
|
goto err_out; |
|
} |
|
|
|
if (nfsi->cache_validity & NFS_INO_INVALID_ACL) |
|
nfs_zap_acl_cache(inode); |
|
|
|
nfs_setsecurity(inode, fattr, label); |
|
|
|
dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", |
|
inode->i_sb->s_id, |
|
(unsigned long long)NFS_FILEID(inode)); |
|
|
|
err_out: |
|
nfs4_label_free(label); |
|
out: |
|
nfs_free_fattr(fattr); |
|
trace_nfs_revalidate_inode_exit(inode, status); |
|
return status; |
|
} |
|
|
|
int nfs_attribute_cache_expired(struct inode *inode) |
|
{ |
|
if (nfs_have_delegated_attributes(inode)) |
|
return 0; |
|
return nfs_attribute_timeout(inode); |
|
} |
|
|
|
/** |
|
* 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_need_revalidate_inode(inode)) |
|
return NFS_STALE(inode) ? -ESTALE : 0; |
|
return __nfs_revalidate_inode(server, inode); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_revalidate_inode); |
|
|
|
static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) |
|
{ |
|
int ret; |
|
|
|
if (mapping->nrpages != 0) { |
|
if (S_ISREG(inode->i_mode)) { |
|
ret = nfs_sync_mapping(mapping); |
|
if (ret < 0) |
|
return ret; |
|
} |
|
ret = invalidate_inode_pages2(mapping); |
|
if (ret < 0) |
|
return ret; |
|
} |
|
nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); |
|
nfs_fscache_wait_on_invalidate(inode); |
|
|
|
dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n", |
|
inode->i_sb->s_id, |
|
(unsigned long long)NFS_FILEID(inode)); |
|
return 0; |
|
} |
|
|
|
/** |
|
* nfs_clear_invalid_mapping - Conditionally clear a mapping |
|
* @mapping: pointer to mapping |
|
* |
|
* If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping. |
|
*/ |
|
int nfs_clear_invalid_mapping(struct address_space *mapping) |
|
{ |
|
struct inode *inode = mapping->host; |
|
struct nfs_inode *nfsi = NFS_I(inode); |
|
unsigned long *bitlock = &nfsi->flags; |
|
int ret = 0; |
|
|
|
/* |
|
* We must clear NFS_INO_INVALID_DATA first to ensure that |
|
* invalidations that come in while we're shooting down the mappings |
|
* are respected. But, that leaves a race window where one revalidator |
|
* can clear the flag, and then another checks it before the mapping |
|
* gets invalidated. Fix that by serializing access to this part of |
|
* the function. |
|
* |
|
* At the same time, we need to allow other tasks to see whether we |
|
* might be in the middle of invalidating the pages, so we only set |
|
* the bit lock here if it looks like we're going to be doing that. |
|
*/ |
|
for (;;) { |
|
ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING, |
|
nfs_wait_bit_killable, TASK_KILLABLE); |
|
if (ret) |
|
goto out; |
|
spin_lock(&inode->i_lock); |
|
if (test_bit(NFS_INO_INVALIDATING, bitlock)) { |
|
spin_unlock(&inode->i_lock); |
|
continue; |
|
} |
|
if (nfsi->cache_validity & NFS_INO_INVALID_DATA) |
|
break; |
|
spin_unlock(&inode->i_lock); |
|
goto out; |
|
} |
|
|
|
set_bit(NFS_INO_INVALIDATING, bitlock); |
|
smp_wmb(); |
|
nfsi->cache_validity &= |
|
~(NFS_INO_INVALID_DATA | NFS_INO_DATA_INVAL_DEFER); |
|
spin_unlock(&inode->i_lock); |
|
trace_nfs_invalidate_mapping_enter(inode); |
|
ret = nfs_invalidate_mapping(inode, mapping); |
|
trace_nfs_invalidate_mapping_exit(inode, ret); |
|
|
|
clear_bit_unlock(NFS_INO_INVALIDATING, bitlock); |
|
smp_mb__after_atomic(); |
|
wake_up_bit(bitlock, NFS_INO_INVALIDATING); |
|
out: |
|
return ret; |
|
} |
|
|
|
bool nfs_mapping_need_revalidate_inode(struct inode *inode) |
|
{ |
|
return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) || |
|
NFS_STALE(inode); |
|
} |
|
|
|
int nfs_revalidate_mapping_rcu(struct inode *inode) |
|
{ |
|
struct nfs_inode *nfsi = NFS_I(inode); |
|
unsigned long *bitlock = &nfsi->flags; |
|
int ret = 0; |
|
|
|
if (IS_SWAPFILE(inode)) |
|
goto out; |
|
if (nfs_mapping_need_revalidate_inode(inode)) { |
|
ret = -ECHILD; |
|
goto out; |
|
} |
|
spin_lock(&inode->i_lock); |
|
if (test_bit(NFS_INO_INVALIDATING, bitlock) || |
|
(nfsi->cache_validity & NFS_INO_INVALID_DATA)) |
|
ret = -ECHILD; |
|
spin_unlock(&inode->i_lock); |
|
out: |
|
return ret; |
|
} |
|
|
|
/** |
|
* nfs_revalidate_mapping - Revalidate the pagecache |
|
* @inode: pointer to host inode |
|
* @mapping: pointer to mapping |
|
*/ |
|
int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) |
|
{ |
|
/* swapfiles are not supposed to be shared. */ |
|
if (IS_SWAPFILE(inode)) |
|
return 0; |
|
|
|
if (nfs_mapping_need_revalidate_inode(inode)) { |
|
int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
|
if (ret < 0) |
|
return ret; |
|
} |
|
|
|
return nfs_clear_invalid_mapping(mapping); |
|
} |
|
|
|
static bool nfs_file_has_writers(struct nfs_inode *nfsi) |
|
{ |
|
struct inode *inode = &nfsi->vfs_inode; |
|
|
|
if (!S_ISREG(inode->i_mode)) |
|
return false; |
|
if (list_empty(&nfsi->open_files)) |
|
return false; |
|
return inode_is_open_for_write(inode); |
|
} |
|
|
|
static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi) |
|
{ |
|
return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi); |
|
} |
|
|
|
static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
|
{ |
|
struct timespec64 ts; |
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) |
|
&& (fattr->valid & NFS_ATTR_FATTR_CHANGE) |
|
&& inode_eq_iversion_raw(inode, fattr->pre_change_attr)) { |
|
inode_set_iversion_raw(inode, fattr->change_attr); |
|
if (S_ISDIR(inode->i_mode)) |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); |
|
else if (nfs_server_capable(inode, NFS_CAP_XATTR)) |
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR); |
|
} |
|
/* If we have atomic WCC data, we may update some attributes */ |
|
ts = inode->i_ctime; |
|
if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) |
|
&& (fattr->valid & NFS_ATTR_FATTR_CTIME) |
|
&& timespec64_equal(&ts, &fattr->pre_ctime)) { |
|
inode->i_ctime = fattr->ctime; |
|
} |
|
|
|
ts = inode->i_mtime; |
|
if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) |
|
&& (fattr->valid & NFS_ATTR_FATTR_MTIME) |
|
&& timespec64_equal(&ts, &fattr->pre_mtime)) { |
|
inode->i_mtime = fattr->mtime; |
|
if (S_ISDIR(inode->i_mode)) |
|
nfs_set_cache_invalid(inode, 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) |
|
&& !nfs_have_writebacks(inode)) { |
|
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; |
|
struct timespec64 ts; |
|
|
|
if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) |
|
return 0; |
|
|
|
if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) { |
|
/* Only a mounted-on-fileid? Just exit */ |
|
if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) |
|
return 0; |
|
/* Has the inode gone and changed behind our back? */ |
|
} else if (nfsi->fileid != fattr->fileid) { |
|
/* Is this perhaps the mounted-on fileid? */ |
|
if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) && |
|
nfsi->fileid == fattr->mounted_on_fileid) |
|
return 0; |
|
return -ESTALE; |
|
} |
|
if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) |
|
return -ESTALE; |
|
|
|
|
|
if (!nfs_file_has_buffered_writers(nfsi)) { |
|
/* Verify a few of the more important attributes */ |
|
if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr)) |
|
invalid |= NFS_INO_INVALID_CHANGE |
|
| NFS_INO_REVAL_PAGECACHE; |
|
|
|
ts = inode->i_mtime; |
|
if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime)) |
|
invalid |= NFS_INO_INVALID_MTIME; |
|
|
|
ts = inode->i_ctime; |
|
if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime)) |
|
invalid |= NFS_INO_INVALID_CTIME; |
|
|
|
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) |
|
invalid |= NFS_INO_INVALID_SIZE |
|
| 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_ACCESS |
|
| NFS_INO_INVALID_ACL |
|
| NFS_INO_INVALID_OTHER; |
|
if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) |
|
invalid |= NFS_INO_INVALID_ACCESS |
|
| NFS_INO_INVALID_ACL |
|
| NFS_INO_INVALID_OTHER; |
|
if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) |
|
invalid |= NFS_INO_INVALID_ACCESS |
|
| NFS_INO_INVALID_ACL |
|
| NFS_INO_INVALID_OTHER; |
|
|
|
/* Has the link count changed? */ |
|
if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) |
|
invalid |= NFS_INO_INVALID_OTHER; |
|
|
|
ts = inode->i_atime; |
|
if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime)) |
|
invalid |= NFS_INO_INVALID_ATIME; |
|
|
|
if (invalid != 0) |
|
nfs_set_cache_invalid(inode, invalid); |
|
|
|
nfsi->read_cache_jiffies = fattr->time_start; |
|
return 0; |
|
} |
|
|
|
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); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_inc_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(); |
|
fattr->owner_name = NULL; |
|
fattr->group_name = NULL; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_fattr_init); |
|
|
|
/** |
|
* nfs_fattr_set_barrier |
|
* @fattr: attributes |
|
* |
|
* Used to set a barrier after an attribute was updated. This |
|
* barrier ensures that older attributes from RPC calls that may |
|
* have raced with our update cannot clobber these new values. |
|
* Note that you are still responsible for ensuring that other |
|
* operations which change the attribute on the server do not |
|
* collide. |
|
*/ |
|
void nfs_fattr_set_barrier(struct nfs_fattr *fattr) |
|
{ |
|
fattr->gencount = nfs_inc_attr_generation_counter(); |
|
} |
|
|
|
struct nfs_fattr *nfs_alloc_fattr(void) |
|
{ |
|
struct nfs_fattr *fattr; |
|
|
|
fattr = kmalloc(sizeof(*fattr), GFP_NOFS); |
|
if (fattr != NULL) |
|
nfs_fattr_init(fattr); |
|
return fattr; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_alloc_fattr); |
|
|
|
struct nfs_fh *nfs_alloc_fhandle(void) |
|
{ |
|
struct nfs_fh *fh; |
|
|
|
fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); |
|
if (fh != NULL) |
|
fh->size = 0; |
|
return fh; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); |
|
|
|
#ifdef NFS_DEBUG |
|
/* |
|
* _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle |
|
* in the same way that wireshark does |
|
* |
|
* @fh: file handle |
|
* |
|
* For debugging only. |
|
*/ |
|
u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) |
|
{ |
|
/* wireshark uses 32-bit AUTODIN crc and does a bitwise |
|
* not on the result */ |
|
return nfs_fhandle_hash(fh); |
|
} |
|
EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash); |
|
|
|
/* |
|
* _nfs_display_fhandle - display an NFS file handle on the console |
|
* |
|
* @fh: file handle to display |
|
* @caption: display caption |
|
* |
|
* For debugging only. |
|
*/ |
|
void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) |
|
{ |
|
unsigned short i; |
|
|
|
if (fh == NULL || fh->size == 0) { |
|
printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); |
|
return; |
|
} |
|
|
|
printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", |
|
caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); |
|
for (i = 0; i < fh->size; i += 16) { |
|
__be32 *pos = (__be32 *)&fh->data[i]; |
|
|
|
switch ((fh->size - i - 1) >> 2) { |
|
case 0: |
|
printk(KERN_DEFAULT " %08x\n", |
|
be32_to_cpup(pos)); |
|
break; |
|
case 1: |
|
printk(KERN_DEFAULT " %08x %08x\n", |
|
be32_to_cpup(pos), be32_to_cpup(pos + 1)); |
|
break; |
|
case 2: |
|
printk(KERN_DEFAULT " %08x %08x %08x\n", |
|
be32_to_cpup(pos), be32_to_cpup(pos + 1), |
|
be32_to_cpup(pos + 2)); |
|
break; |
|
default: |
|
printk(KERN_DEFAULT " %08x %08x %08x %08x\n", |
|
be32_to_cpup(pos), be32_to_cpup(pos + 1), |
|
be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); |
|
} |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(_nfs_display_fhandle); |
|
#endif |
|
|
|
/** |
|
* 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) |
|
{ |
|
unsigned long attr_gencount = NFS_I(inode)->attr_gencount; |
|
|
|
return (long)(fattr->gencount - attr_gencount) > 0 || |
|
(long)(attr_gencount - nfs_read_attr_generation_counter()) > 0; |
|
} |
|
|
|
static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) |
|
{ |
|
int ret; |
|
|
|
trace_nfs_refresh_inode_enter(inode); |
|
|
|
if (nfs_inode_attrs_need_update(inode, fattr)) |
|
ret = nfs_update_inode(inode, fattr); |
|
else |
|
ret = nfs_check_inode_attributes(inode, fattr); |
|
|
|
trace_nfs_refresh_inode_exit(inode, ret); |
|
return ret; |
|
} |
|
|
|
/** |
|
* 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; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_refresh_inode); |
|
|
|
static int nfs_post_op_update_inode_locked(struct inode *inode, |
|
struct nfs_fattr *fattr, unsigned int invalid) |
|
{ |
|
if (S_ISDIR(inode->i_mode)) |
|
invalid |= NFS_INO_INVALID_DATA; |
|
nfs_set_cache_invalid(inode, invalid); |
|
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); |
|
nfs_fattr_set_barrier(fattr); |
|
status = nfs_post_op_update_inode_locked(inode, fattr, |
|
NFS_INO_INVALID_CHANGE |
|
| NFS_INO_INVALID_CTIME |
|
| NFS_INO_REVAL_FORCED); |
|
spin_unlock(&inode->i_lock); |
|
|
|
return status; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); |
|
|
|
/** |
|
* nfs_post_op_update_inode_force_wcc_locked - 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_locked(struct inode *inode, struct nfs_fattr *fattr) |
|
{ |
|
int status; |
|
|
|
/* 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 = inode_peek_iversion_raw(inode); |
|
fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; |
|
} |
|
if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && |
|
(fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { |
|
fattr->pre_ctime = inode->i_ctime; |
|
fattr->valid |= NFS_ATTR_FATTR_PRECTIME; |
|
} |
|
if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && |
|
(fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { |
|
fattr->pre_mtime = inode->i_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, |
|
NFS_INO_INVALID_CHANGE |
|
| NFS_INO_INVALID_CTIME |
|
| NFS_INO_INVALID_MTIME |
|
| NFS_INO_INVALID_BLOCKS); |
|
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); |
|
nfs_fattr_set_barrier(fattr); |
|
status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr); |
|
spin_unlock(&inode->i_lock); |
|
return status; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); |
|
|
|
|
|
/* |
|
* 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; |
|
unsigned long save_cache_validity; |
|
bool have_writers = nfs_file_has_buffered_writers(nfsi); |
|
bool cache_revalidated = true; |
|
bool attr_changed = false; |
|
bool have_delegation; |
|
|
|
dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n", |
|
__func__, inode->i_sb->s_id, inode->i_ino, |
|
nfs_display_fhandle_hash(NFS_FH(inode)), |
|
atomic_read(&inode->i_count), fattr->valid); |
|
|
|
if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) { |
|
/* Only a mounted-on-fileid? Just exit */ |
|
if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) |
|
return 0; |
|
/* Has the inode gone and changed behind our back? */ |
|
} else if (nfsi->fileid != fattr->fileid) { |
|
/* Is this perhaps the mounted-on fileid? */ |
|
if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) && |
|
nfsi->fileid == fattr->mounted_on_fileid) |
|
return 0; |
|
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; |
|
} |
|
|
|
/* |
|
* 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)) { |
|
/* |
|
* Big trouble! The inode has become a different object. |
|
*/ |
|
printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n", |
|
__func__, inode->i_ino, inode->i_mode, fattr->mode); |
|
goto out_err; |
|
} |
|
|
|
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) && |
|
!IS_AUTOMOUNT(inode)) |
|
server->fsid = fattr->fsid; |
|
|
|
/* Save the delegation state before clearing cache_validity */ |
|
have_delegation = nfs_have_delegated_attributes(inode); |
|
|
|
/* |
|
* Update the read time so we don't revalidate too often. |
|
*/ |
|
nfsi->read_cache_jiffies = fattr->time_start; |
|
|
|
save_cache_validity = nfsi->cache_validity; |
|
nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR |
|
| NFS_INO_INVALID_ATIME |
|
| NFS_INO_REVAL_FORCED |
|
| NFS_INO_REVAL_PAGECACHE |
|
| NFS_INO_INVALID_BLOCKS); |
|
|
|
/* Do atomic weak cache consistency updates */ |
|
nfs_wcc_update_inode(inode, fattr); |
|
|
|
if (pnfs_layoutcommit_outstanding(inode)) { |
|
nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR; |
|
cache_revalidated = false; |
|
} |
|
|
|
/* More cache consistency checks */ |
|
if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { |
|
if (!inode_eq_iversion_raw(inode, fattr->change_attr)) { |
|
/* Could it be a race with writeback? */ |
|
if (!(have_writers || have_delegation)) { |
|
invalid |= NFS_INO_INVALID_DATA |
|
| NFS_INO_INVALID_ACCESS |
|
| NFS_INO_INVALID_ACL |
|
| NFS_INO_INVALID_XATTR; |
|
/* Force revalidate of all attributes */ |
|
save_cache_validity |= NFS_INO_INVALID_CTIME |
|
| NFS_INO_INVALID_MTIME |
|
| NFS_INO_INVALID_SIZE |
|
| NFS_INO_INVALID_OTHER; |
|
if (S_ISDIR(inode->i_mode)) |
|
nfs_force_lookup_revalidate(inode); |
|
dprintk("NFS: change_attr change on server for file %s/%ld\n", |
|
inode->i_sb->s_id, |
|
inode->i_ino); |
|
} else if (!have_delegation) |
|
nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER; |
|
inode_set_iversion_raw(inode, fattr->change_attr); |
|
attr_changed = true; |
|
} |
|
} else { |
|
nfsi->cache_validity |= save_cache_validity & |
|
(NFS_INO_INVALID_CHANGE |
|
| NFS_INO_REVAL_PAGECACHE |
|
| NFS_INO_REVAL_FORCED); |
|
cache_revalidated = false; |
|
} |
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_MTIME) { |
|
inode->i_mtime = fattr->mtime; |
|
} else if (server->caps & NFS_CAP_MTIME) { |
|
nfsi->cache_validity |= save_cache_validity & |
|
(NFS_INO_INVALID_MTIME |
|
| NFS_INO_REVAL_FORCED); |
|
cache_revalidated = false; |
|
} |
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_CTIME) { |
|
inode->i_ctime = fattr->ctime; |
|
} else if (server->caps & NFS_CAP_CTIME) { |
|
nfsi->cache_validity |= save_cache_validity & |
|
(NFS_INO_INVALID_CTIME |
|
| NFS_INO_REVAL_FORCED); |
|
cache_revalidated = false; |
|
} |
|
|
|
/* 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 && !have_delegation) { |
|
/* Do we perhaps have any outstanding writes, or has |
|
* the file grown beyond our last write? */ |
|
if (!nfs_have_writebacks(inode) || new_isize > cur_isize) { |
|
i_size_write(inode, new_isize); |
|
if (!have_writers) |
|
invalid |= NFS_INO_INVALID_DATA; |
|
attr_changed = true; |
|
} |
|
dprintk("NFS: isize change on server for file %s/%ld " |
|
"(%Ld to %Ld)\n", |
|
inode->i_sb->s_id, |
|
inode->i_ino, |
|
(long long)cur_isize, |
|
(long long)new_isize); |
|
} |
|
} else { |
|
nfsi->cache_validity |= save_cache_validity & |
|
(NFS_INO_INVALID_SIZE |
|
| NFS_INO_REVAL_PAGECACHE |
|
| NFS_INO_REVAL_FORCED); |
|
cache_revalidated = false; |
|
} |
|
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_ATIME) |
|
inode->i_atime = fattr->atime; |
|
else if (server->caps & NFS_CAP_ATIME) { |
|
nfsi->cache_validity |= save_cache_validity & |
|
(NFS_INO_INVALID_ATIME |
|
| NFS_INO_REVAL_FORCED); |
|
cache_revalidated = false; |
|
} |
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_MODE) { |
|
if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { |
|
umode_t newmode = inode->i_mode & S_IFMT; |
|
newmode |= fattr->mode & S_IALLUGO; |
|
inode->i_mode = newmode; |
|
invalid |= NFS_INO_INVALID_ACCESS |
|
| NFS_INO_INVALID_ACL; |
|
attr_changed = true; |
|
} |
|
} else if (server->caps & NFS_CAP_MODE) { |
|
nfsi->cache_validity |= save_cache_validity & |
|
(NFS_INO_INVALID_OTHER |
|
| NFS_INO_REVAL_FORCED); |
|
cache_revalidated = false; |
|
} |
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_OWNER) { |
|
if (!uid_eq(inode->i_uid, fattr->uid)) { |
|
invalid |= NFS_INO_INVALID_ACCESS |
|
| NFS_INO_INVALID_ACL; |
|
inode->i_uid = fattr->uid; |
|
attr_changed = true; |
|
} |
|
} else if (server->caps & NFS_CAP_OWNER) { |
|
nfsi->cache_validity |= save_cache_validity & |
|
(NFS_INO_INVALID_OTHER |
|
| NFS_INO_REVAL_FORCED); |
|
cache_revalidated = false; |
|
} |
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_GROUP) { |
|
if (!gid_eq(inode->i_gid, fattr->gid)) { |
|
invalid |= NFS_INO_INVALID_ACCESS |
|
| NFS_INO_INVALID_ACL; |
|
inode->i_gid = fattr->gid; |
|
attr_changed = true; |
|
} |
|
} else if (server->caps & NFS_CAP_OWNER_GROUP) { |
|
nfsi->cache_validity |= save_cache_validity & |
|
(NFS_INO_INVALID_OTHER |
|
| NFS_INO_REVAL_FORCED); |
|
cache_revalidated = false; |
|
} |
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_NLINK) { |
|
if (inode->i_nlink != fattr->nlink) { |
|
if (S_ISDIR(inode->i_mode)) |
|
invalid |= NFS_INO_INVALID_DATA; |
|
set_nlink(inode, fattr->nlink); |
|
attr_changed = true; |
|
} |
|
} else if (server->caps & NFS_CAP_NLINK) { |
|
nfsi->cache_validity |= save_cache_validity & |
|
(NFS_INO_INVALID_OTHER |
|
| NFS_INO_REVAL_FORCED); |
|
cache_revalidated = false; |
|
} |
|
|
|
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); |
|
} else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) |
|
inode->i_blocks = fattr->du.nfs2.blocks; |
|
else { |
|
nfsi->cache_validity |= save_cache_validity & |
|
(NFS_INO_INVALID_BLOCKS |
|
| NFS_INO_REVAL_FORCED); |
|
cache_revalidated = false; |
|
} |
|
|
|
/* Update attrtimeo value if we're out of the unstable period */ |
|
if (attr_changed) { |
|
invalid &= ~NFS_INO_INVALID_ATTR; |
|
nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); |
|
nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
|
nfsi->attrtimeo_timestamp = now; |
|
/* Set barrier to be more recent than all outstanding updates */ |
|
nfsi->attr_gencount = nfs_inc_attr_generation_counter(); |
|
} else { |
|
if (cache_revalidated) { |
|
if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, |
|
nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { |
|
nfsi->attrtimeo <<= 1; |
|
if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode)) |
|
nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); |
|
} |
|
nfsi->attrtimeo_timestamp = now; |
|
} |
|
/* Set the barrier to be more recent than this fattr */ |
|
if ((long)(fattr->gencount - nfsi->attr_gencount) > 0) |
|
nfsi->attr_gencount = fattr->gencount; |
|
} |
|
|
|
/* 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; |
|
nfs_set_cache_invalid(inode, invalid); |
|
|
|
return 0; |
|
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_set_inode_stale_locked(inode); |
|
return -ESTALE; |
|
} |
|
|
|
struct inode *nfs_alloc_inode(struct super_block *sb) |
|
{ |
|
struct nfs_inode *nfsi; |
|
nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); |
|
if (!nfsi) |
|
return NULL; |
|
nfsi->flags = 0UL; |
|
nfsi->cache_validity = 0UL; |
|
#if IS_ENABLED(CONFIG_NFS_V4) |
|
nfsi->nfs4_acl = NULL; |
|
#endif /* CONFIG_NFS_V4 */ |
|
#ifdef CONFIG_NFS_V4_2 |
|
nfsi->xattr_cache = NULL; |
|
#endif |
|
return &nfsi->vfs_inode; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_alloc_inode); |
|
|
|
void nfs_free_inode(struct inode *inode) |
|
{ |
|
kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_free_inode); |
|
|
|
static inline void nfs4_init_once(struct nfs_inode *nfsi) |
|
{ |
|
#if IS_ENABLED(CONFIG_NFS_V4) |
|
INIT_LIST_HEAD(&nfsi->open_states); |
|
nfsi->delegation = NULL; |
|
init_rwsem(&nfsi->rwsem); |
|
nfsi->layout = NULL; |
|
#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_LIST_HEAD(&nfsi->commit_info.list); |
|
atomic_long_set(&nfsi->nrequests, 0); |
|
atomic_long_set(&nfsi->commit_info.ncommit, 0); |
|
atomic_set(&nfsi->commit_info.rpcs_out, 0); |
|
init_rwsem(&nfsi->rmdir_sem); |
|
mutex_init(&nfsi->commit_mutex); |
|
nfs4_init_once(nfsi); |
|
nfsi->cache_change_attribute = 0; |
|
} |
|
|
|
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|SLAB_ACCOUNT), |
|
init_once); |
|
if (nfs_inode_cachep == NULL) |
|
return -ENOMEM; |
|
|
|
return 0; |
|
} |
|
|
|
static void nfs_destroy_inodecache(void) |
|
{ |
|
/* |
|
* Make sure all delayed rcu free inodes are flushed before we |
|
* destroy cache. |
|
*/ |
|
rcu_barrier(); |
|
kmem_cache_destroy(nfs_inode_cachep); |
|
} |
|
|
|
struct workqueue_struct *nfsiod_workqueue; |
|
EXPORT_SYMBOL_GPL(nfsiod_workqueue); |
|
|
|
/* |
|
* start up the nfsiod workqueue |
|
*/ |
|
static int nfsiod_start(void) |
|
{ |
|
struct workqueue_struct *wq; |
|
dprintk("RPC: creating workqueue nfsiod\n"); |
|
wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0); |
|
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); |
|
} |
|
|
|
unsigned int nfs_net_id; |
|
EXPORT_SYMBOL_GPL(nfs_net_id); |
|
|
|
static int nfs_net_init(struct net *net) |
|
{ |
|
nfs_clients_init(net); |
|
return nfs_fs_proc_net_init(net); |
|
} |
|
|
|
static void nfs_net_exit(struct net *net) |
|
{ |
|
nfs_fs_proc_net_exit(net); |
|
nfs_clients_exit(net); |
|
} |
|
|
|
static struct pernet_operations nfs_net_ops = { |
|
.init = nfs_net_init, |
|
.exit = nfs_net_exit, |
|
.id = &nfs_net_id, |
|
.size = sizeof(struct nfs_net), |
|
}; |
|
|
|
/* |
|
* Initialize NFS |
|
*/ |
|
static int __init init_nfs_fs(void) |
|
{ |
|
int err; |
|
|
|
err = nfs_sysfs_init(); |
|
if (err < 0) |
|
goto out10; |
|
|
|
err = register_pernet_subsys(&nfs_net_ops); |
|
if (err < 0) |
|
goto out9; |
|
|
|
err = nfs_fscache_register(); |
|
if (err < 0) |
|
goto out8; |
|
|
|
err = nfsiod_start(); |
|
if (err) |
|
goto out7; |
|
|
|
err = nfs_fs_proc_init(); |
|
if (err) |
|
goto out6; |
|
|
|
err = nfs_init_nfspagecache(); |
|
if (err) |
|
goto out5; |
|
|
|
err = nfs_init_inodecache(); |
|
if (err) |
|
goto out4; |
|
|
|
err = nfs_init_readpagecache(); |
|
if (err) |
|
goto out3; |
|
|
|
err = nfs_init_writepagecache(); |
|
if (err) |
|
goto out2; |
|
|
|
err = nfs_init_directcache(); |
|
if (err) |
|
goto out1; |
|
|
|
rpc_proc_register(&init_net, &nfs_rpcstat); |
|
|
|
err = register_nfs_fs(); |
|
if (err) |
|
goto out0; |
|
|
|
return 0; |
|
out0: |
|
rpc_proc_unregister(&init_net, "nfs"); |
|
nfs_destroy_directcache(); |
|
out1: |
|
nfs_destroy_writepagecache(); |
|
out2: |
|
nfs_destroy_readpagecache(); |
|
out3: |
|
nfs_destroy_inodecache(); |
|
out4: |
|
nfs_destroy_nfspagecache(); |
|
out5: |
|
nfs_fs_proc_exit(); |
|
out6: |
|
nfsiod_stop(); |
|
out7: |
|
nfs_fscache_unregister(); |
|
out8: |
|
unregister_pernet_subsys(&nfs_net_ops); |
|
out9: |
|
nfs_sysfs_exit(); |
|
out10: |
|
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(); |
|
unregister_pernet_subsys(&nfs_net_ops); |
|
rpc_proc_unregister(&init_net, "nfs"); |
|
unregister_nfs_fs(); |
|
nfs_fs_proc_exit(); |
|
nfsiod_stop(); |
|
nfs_sysfs_exit(); |
|
} |
|
|
|
/* Not quite true; I just maintain it */ |
|
MODULE_AUTHOR("Olaf Kirch <[email protected]>"); |
|
MODULE_LICENSE("GPL"); |
|
module_param(enable_ino64, bool, 0644); |
|
|
|
module_init(init_nfs_fs) |
|
module_exit(exit_nfs_fs)
|
|
|