| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * linux/fs/nfs/inode.c |
| * |
| * Copyright (C) 1992 Rick Sladkey |
| * |
| * nfs inode and superblock handling functions |
| * |
| * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some |
| * experimental NFS changes. Modularisation taken straight from SYS5 fs. |
| * |
| * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. |
| * J.S.Peatfield@damtp.cam.ac.uk |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/sched/signal.h> |
| #include <linux/time.h> |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/string.h> |
| #include <linux/stat.h> |
| #include <linux/errno.h> |
| #include <linux/unistd.h> |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/sunrpc/stats.h> |
| #include <linux/sunrpc/metrics.h> |
| #include <linux/nfs_fs.h> |
| #include <linux/nfs_mount.h> |
| #include <linux/nfs4_mount.h> |
| #include <linux/lockd/bind.h> |
| #include <linux/seq_file.h> |
| #include <linux/mount.h> |
| #include <linux/vfs.h> |
| #include <linux/inet.h> |
| #include <linux/nfs_xdr.h> |
| #include <linux/slab.h> |
| #include <linux/compat.h> |
| #include <linux/freezer.h> |
| #include <linux/uaccess.h> |
| #include <linux/iversion.h> |
| |
| #include "nfs4_fs.h" |
| #include "callback.h" |
| #include "delegation.h" |
| #include "iostat.h" |
| #include "internal.h" |
| #include "fscache.h" |
| #include "pnfs.h" |
| #include "nfs.h" |
| #include "netns.h" |
| #include "sysfs.h" |
| |
| #include "nfstrace.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_VFS |
| |
| #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 |
| |
| /* Default is to see 64-bit inode numbers */ |
| static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; |
| |
| static int nfs_update_inode(struct inode *, struct nfs_fattr *); |
| |
| static struct kmem_cache * nfs_inode_cachep; |
| |
| static inline unsigned long |
| nfs_fattr_to_ino_t(struct nfs_fattr *fattr) |
| { |
| return nfs_fileid_to_ino_t(fattr->fileid); |
| } |
| |
| int nfs_wait_bit_killable(struct wait_bit_key *key, int mode) |
| { |
| schedule(); |
| if (signal_pending_state(mode, current)) |
| return -ERESTARTSYS; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(nfs_wait_bit_killable); |
| |
| /** |
| * nfs_compat_user_ino64 - returns the user-visible inode number |
| * @fileid: 64-bit fileid |
| * |
| * This function returns a 32-bit inode number if the boot parameter |
| * nfs.enable_ino64 is zero. |
| */ |
| u64 nfs_compat_user_ino64(u64 fileid) |
| { |
| #ifdef CONFIG_COMPAT |
| compat_ulong_t ino; |
| #else |
| unsigned long ino; |
| #endif |
| |
| if (enable_ino64) |
| return fileid; |
| ino = fileid; |
| if (sizeof(ino) < sizeof(fileid)) |
| ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8; |
| return ino; |
| } |
| |
| int nfs_drop_inode(struct inode *inode) |
| { |
| return NFS_STALE(inode) || generic_drop_inode(inode); |
| } |
| EXPORT_SYMBOL_GPL(nfs_drop_inode); |
| |
| void nfs_clear_inode(struct inode *inode) |
| { |
| /* |
| * The following should never happen... |
| */ |
| WARN_ON_ONCE(nfs_have_writebacks(inode)); |
| WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files)); |
| nfs_zap_acl_cache(inode); |
| nfs_access_zap_cache(inode); |
| nfs_fscache_clear_inode(inode); |
| } |
| EXPORT_SYMBOL_GPL(nfs_clear_inode); |
| |
| void nfs_evict_inode(struct inode *inode) |
| { |
| truncate_inode_pages_final(&inode->i_data); |
| clear_inode(inode); |
| nfs_clear_inode(inode); |
| } |
| |
| int nfs_sync_inode(struct inode *inode) |
| { |
| inode_dio_wait(inode); |
| return nfs_wb_all(inode); |
| } |
| EXPORT_SYMBOL_GPL(nfs_sync_inode); |
| |
| /** |
| * nfs_sync_mapping - helper to flush all mmapped dirty data to disk |
| * @mapping: pointer to struct address_space |
| */ |
| int nfs_sync_mapping(struct address_space *mapping) |
| { |
| int ret = 0; |
| |
| if (mapping->nrpages != 0) { |
| unmap_mapping_range(mapping, 0, 0, 0); |
| ret = nfs_wb_all(mapping->host); |
| } |
| return ret; |
| } |
| |
| static int nfs_attribute_timeout(struct inode *inode) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); |
| } |
| |
| static bool nfs_check_cache_flags_invalid(struct inode *inode, |
| unsigned long flags) |
| { |
| unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); |
| |
| return (cache_validity & flags) != 0; |
| } |
| |
| bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags) |
| { |
| if (nfs_check_cache_flags_invalid(inode, flags)) |
| return true; |
| return nfs_attribute_cache_expired(inode); |
| } |
| EXPORT_SYMBOL_GPL(nfs_check_cache_invalid); |
| |
| #ifdef CONFIG_NFS_V4_2 |
| static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi) |
| { |
| return nfsi->xattr_cache != NULL; |
| } |
| #else |
| static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi) |
| { |
| return false; |
| } |
| #endif |
| |
| void nfs_set_cache_invalid(struct inode *inode, unsigned long flags) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| if (nfs_have_delegated_attributes(inode)) { |
| if (!(flags & NFS_INO_REVAL_FORCED)) |
| flags &= ~(NFS_INO_INVALID_MODE | |
| NFS_INO_INVALID_OTHER | |
| NFS_INO_INVALID_XATTR); |
| flags &= ~(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE); |
| } |
| |
| if (!nfs_has_xattr_cache(nfsi)) |
| flags &= ~NFS_INO_INVALID_XATTR; |
| if (flags & NFS_INO_INVALID_DATA) |
| nfs_fscache_invalidate(inode, 0); |
| flags &= ~NFS_INO_REVAL_FORCED; |
| |
| nfsi->cache_validity |= flags; |
| |
| if (inode->i_mapping->nrpages == 0) { |
| nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; |
| nfs_ooo_clear(nfsi); |
| } else if (nfsi->cache_validity & NFS_INO_INVALID_DATA) { |
| nfs_ooo_clear(nfsi); |
| } |
| trace_nfs_set_cache_invalid(inode, 0); |
| } |
| EXPORT_SYMBOL_GPL(nfs_set_cache_invalid); |
| |
| /* |
| * Invalidate the local caches |
| */ |
| static void nfs_zap_caches_locked(struct inode *inode) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| int mode = inode->i_mode; |
| |
| nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); |
| |
| nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
| nfsi->attrtimeo_timestamp = jiffies; |
| |
| if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR | |
| NFS_INO_INVALID_DATA | |
| NFS_INO_INVALID_ACCESS | |
| NFS_INO_INVALID_ACL | |
| NFS_INO_INVALID_XATTR); |
| else |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR | |
| NFS_INO_INVALID_ACCESS | |
| NFS_INO_INVALID_ACL | |
| NFS_INO_INVALID_XATTR); |
| nfs_zap_label_cache_locked(nfsi); |
| } |
| |
| void nfs_zap_caches(struct inode *inode) |
| { |
| spin_lock(&inode->i_lock); |
| nfs_zap_caches_locked(inode); |
| spin_unlock(&inode->i_lock); |
| } |
| |
| void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) |
| { |
| if (mapping->nrpages != 0) { |
| spin_lock(&inode->i_lock); |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); |
| spin_unlock(&inode->i_lock); |
| } |
| } |
| |
| void nfs_zap_acl_cache(struct inode *inode) |
| { |
| void (*clear_acl_cache)(struct inode *); |
| |
| clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; |
| if (clear_acl_cache != NULL) |
| clear_acl_cache(inode); |
| spin_lock(&inode->i_lock); |
| NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; |
| spin_unlock(&inode->i_lock); |
| } |
| EXPORT_SYMBOL_GPL(nfs_zap_acl_cache); |
| |
| void nfs_invalidate_atime(struct inode *inode) |
| { |
| if (nfs_have_delegated_atime(inode)) |
| return; |
| spin_lock(&inode->i_lock); |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); |
| spin_unlock(&inode->i_lock); |
| } |
| EXPORT_SYMBOL_GPL(nfs_invalidate_atime); |
| |
| /* |
| * Invalidate, but do not unhash, the inode. |
| * NB: must be called with inode->i_lock held! |
| */ |
| static void nfs_set_inode_stale_locked(struct inode *inode) |
| { |
| set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); |
| nfs_zap_caches_locked(inode); |
| trace_nfs_set_inode_stale(inode); |
| } |
| |
| void nfs_set_inode_stale(struct inode *inode) |
| { |
| spin_lock(&inode->i_lock); |
| nfs_set_inode_stale_locked(inode); |
| spin_unlock(&inode->i_lock); |
| } |
| |
| struct nfs_find_desc { |
| struct nfs_fh *fh; |
| struct nfs_fattr *fattr; |
| }; |
| |
| /* |
| * In NFSv3 we can have 64bit inode numbers. In order to support |
| * this, and re-exported directories (also seen in NFSv2) |
| * we are forced to allow 2 different inodes to have the same |
| * i_ino. |
| */ |
| static int |
| nfs_find_actor(struct inode *inode, void *opaque) |
| { |
| struct nfs_find_desc *desc = opaque; |
| struct nfs_fh *fh = desc->fh; |
| struct nfs_fattr *fattr = desc->fattr; |
| |
| if (NFS_FILEID(inode) != fattr->fileid) |
| return 0; |
| if (inode_wrong_type(inode, fattr->mode)) |
| return 0; |
| if (nfs_compare_fh(NFS_FH(inode), fh)) |
| return 0; |
| if (is_bad_inode(inode) || NFS_STALE(inode)) |
| return 0; |
| return 1; |
| } |
| |
| static int |
| nfs_init_locked(struct inode *inode, void *opaque) |
| { |
| struct nfs_find_desc *desc = opaque; |
| struct nfs_fattr *fattr = desc->fattr; |
| |
| set_nfs_fileid(inode, fattr->fileid); |
| inode->i_mode = fattr->mode; |
| nfs_copy_fh(NFS_FH(inode), desc->fh); |
| return 0; |
| } |
| |
| #ifdef CONFIG_NFS_V4_SECURITY_LABEL |
| static void nfs_clear_label_invalid(struct inode *inode) |
| { |
| spin_lock(&inode->i_lock); |
| NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL; |
| spin_unlock(&inode->i_lock); |
| } |
| |
| void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr) |
| { |
| int error; |
| |
| if (fattr->label == NULL) |
| return; |
| |
| if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) { |
| error = security_inode_notifysecctx(inode, fattr->label->label, |
| fattr->label->len); |
| if (error) |
| printk(KERN_ERR "%s() %s %d " |
| "security_inode_notifysecctx() %d\n", |
| __func__, |
| (char *)fattr->label->label, |
| fattr->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; |
| |
| if (!(server->caps & NFS_CAP_SECURITY_LABEL)) |
| return NULL; |
| |
| 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) |
| { |
| } |
| #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; |
| } |
| |
| static void nfs_inode_init_regular(struct nfs_inode *nfsi) |
| { |
| atomic_long_set(&nfsi->nrequests, 0); |
| atomic_long_set(&nfsi->redirtied_pages, 0); |
| INIT_LIST_HEAD(&nfsi->commit_info.list); |
| atomic_long_set(&nfsi->commit_info.ncommit, 0); |
| atomic_set(&nfsi->commit_info.rpcs_out, 0); |
| mutex_init(&nfsi->commit_mutex); |
| } |
| |
| static void nfs_inode_init_dir(struct nfs_inode *nfsi) |
| { |
| nfsi->cache_change_attribute = 0; |
| memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); |
| init_rwsem(&nfsi->rmdir_sem); |
| } |
| |
| /* |
| * This is our front-end to iget that looks up inodes by file handle |
| * instead of inode number. |
| */ |
| struct inode * |
| nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) |
| { |
| struct nfs_find_desc desc = { |
| .fh = fh, |
| .fattr = fattr |
| }; |
| struct inode *inode = ERR_PTR(-ENOENT); |
| u64 fattr_supported = NFS_SB(sb)->fattr_valid; |
| 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 |
| && (fattr_supported & NFS_ATTR_FATTR_MODE)) |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE); |
| /* Why so? Because we want revalidate for devices/FIFOs, and |
| * that's precisely what we have in nfs_file_inode_operations. |
| */ |
| inode->i_op = NFS_SB(sb)->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; |
| nfs_inode_init_regular(nfsi); |
| mapping_set_large_folios(inode->i_mapping); |
| } 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; |
| nfs_inode_init_dir(nfsi); |
| /* 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); |
| |
| inode_set_atime(inode, 0, 0); |
| inode_set_mtime(inode, 0, 0); |
| inode_set_ctime(inode, 0, 0); |
| 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; |
| 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_set_atime_to_ts(inode, fattr->atime); |
| else if (fattr_supported & NFS_ATTR_FATTR_ATIME) |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); |
| if (fattr->valid & NFS_ATTR_FATTR_MTIME) |
| inode_set_mtime_to_ts(inode, fattr->mtime); |
| else if (fattr_supported & NFS_ATTR_FATTR_MTIME) |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); |
| if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| inode_set_ctime_to_ts(inode, fattr->ctime); |
| else if (fattr_supported & NFS_ATTR_FATTR_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 (fattr_supported & NFS_ATTR_FATTR_NLINK) |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK); |
| if (fattr->valid & NFS_ATTR_FATTR_OWNER) |
| inode->i_uid = fattr->uid; |
| else if (fattr_supported & NFS_ATTR_FATTR_OWNER) |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); |
| if (fattr->valid & NFS_ATTR_FATTR_GROUP) |
| inode->i_gid = fattr->gid; |
| else if (fattr_supported & NFS_ATTR_FATTR_GROUP) |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); |
| if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) |
| inode->i_blocks = fattr->du.nfs2.blocks; |
| else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED && |
| fattr->size != 0) |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_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); |
| } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED && |
| fattr->size != 0) |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS); |
| |
| nfs_setsecurity(inode, fattr); |
| |
| 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); |
| |
| static void |
| nfs_fattr_fixup_delegated(struct inode *inode, struct nfs_fattr *fattr) |
| { |
| unsigned long cache_validity = NFS_I(inode)->cache_validity; |
| |
| if (nfs_have_delegated_mtime(inode)) { |
| if (!(cache_validity & NFS_INO_INVALID_CTIME)) |
| fattr->valid &= ~(NFS_ATTR_FATTR_PRECTIME | |
| NFS_ATTR_FATTR_CTIME); |
| |
| if (!(cache_validity & NFS_INO_INVALID_MTIME)) |
| fattr->valid &= ~(NFS_ATTR_FATTR_PREMTIME | |
| NFS_ATTR_FATTR_MTIME); |
| |
| if (!(cache_validity & NFS_INO_INVALID_ATIME)) |
| fattr->valid &= ~NFS_ATTR_FATTR_ATIME; |
| } else if (nfs_have_delegated_atime(inode)) { |
| if (!(cache_validity & NFS_INO_INVALID_ATIME)) |
| fattr->valid &= ~NFS_ATTR_FATTR_ATIME; |
| } |
| } |
| |
| void nfs_update_delegated_atime(struct inode *inode) |
| { |
| spin_lock(&inode->i_lock); |
| if (nfs_have_delegated_atime(inode)) { |
| inode_update_timestamps(inode, S_ATIME); |
| NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ATIME; |
| } |
| spin_unlock(&inode->i_lock); |
| } |
| |
| void nfs_update_delegated_mtime_locked(struct inode *inode) |
| { |
| if (nfs_have_delegated_mtime(inode)) { |
| inode_update_timestamps(inode, S_CTIME | S_MTIME); |
| NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_CTIME | |
| NFS_INO_INVALID_MTIME); |
| } |
| } |
| |
| void nfs_update_delegated_mtime(struct inode *inode) |
| { |
| spin_lock(&inode->i_lock); |
| nfs_update_delegated_mtime_locked(inode); |
| spin_unlock(&inode->i_lock); |
| } |
| EXPORT_SYMBOL_GPL(nfs_update_delegated_mtime); |
| |
| #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 mnt_idmap *idmap, 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; |
| } |
| |
| if (nfs_have_delegated_mtime(inode)) { |
| if (attr->ia_valid & ATTR_MTIME) { |
| nfs_update_delegated_mtime(inode); |
| attr->ia_valid &= ~ATTR_MTIME; |
| } |
| if (attr->ia_valid & ATTR_ATIME) { |
| nfs_update_delegated_atime(inode); |
| attr->ia_valid &= ~ATTR_ATIME; |
| } |
| } |
| |
| /* Optimization: if the end result is no change, don't RPC */ |
| if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(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_with_label(NFS_SERVER(inode)); |
| 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; |
| |
| trace_nfs_size_truncate(inode, offset); |
| i_size_write(inode, offset); |
| /* Optimisation */ |
| if (offset == 0) { |
| NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA; |
| nfs_ooo_clear(NFS_I(inode)); |
| } |
| NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE; |
| |
| spin_unlock(&inode->i_lock); |
| truncate_pagecache(inode, offset); |
| nfs_update_delegated_mtime_locked(inode); |
| 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) { |
| if (!nfs_have_delegated_mtime(inode)) |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS); |
| 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_KILL_SUID) != 0 && |
| inode->i_mode & S_ISUID) |
| inode->i_mode &= ~S_ISUID; |
| if (setattr_should_drop_sgid(&nop_mnt_idmap, inode)) |
| inode->i_mode &= ~S_ISGID; |
| 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_set_ctime_to_ts(inode, 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_set_atime_to_ts(inode, fattr->atime); |
| else if (attr->ia_valid & ATTR_ATIME_SET) |
| inode_set_atime_to_ts(inode, attr->ia_atime); |
| else |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); |
| |
| if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| inode_set_ctime_to_ts(inode, 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_set_mtime_to_ts(inode, fattr->mtime); |
| else if (attr->ia_valid & ATTR_MTIME_SET) |
| inode_set_mtime_to_ts(inode, attr->ia_mtime); |
| else |
| nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); |
| |
| if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| inode_set_ctime_to_ts(inode, 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); |
| |
| /* |
| * Don't request help from readdirplus if the file is being written to, |
| * or if attribute caching is turned off |
| */ |
| static bool nfs_getattr_readdirplus_enable(const struct inode *inode) |
| { |
| return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) && |
| !nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ; |
| } |
| |
| static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry) |
| { |
| if (!IS_ROOT(dentry)) { |
| struct dentry *parent = dget_parent(dentry); |
| nfs_readdir_record_entry_cache_miss(d_inode(parent)); |
| dput(parent); |
| } |
| } |
| |
| static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry) |
| { |
| if (!IS_ROOT(dentry)) { |
| struct dentry *parent = dget_parent(dentry); |
| nfs_readdir_record_entry_cache_hit(d_inode(parent)); |
| dput(parent); |
| } |
| } |
| |
| static u32 nfs_get_valid_attrmask(struct inode *inode) |
| { |
| unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); |
| u32 reply_mask = STATX_INO | STATX_TYPE; |
| |
| if (!(cache_validity & NFS_INO_INVALID_ATIME)) |
| reply_mask |= STATX_ATIME; |
| if (!(cache_validity & NFS_INO_INVALID_CTIME)) |
| reply_mask |= STATX_CTIME; |
| if (!(cache_validity & NFS_INO_INVALID_MTIME)) |
| reply_mask |= STATX_MTIME; |
| if (!(cache_validity & NFS_INO_INVALID_SIZE)) |
| reply_mask |= STATX_SIZE; |
| if (!(cache_validity & NFS_INO_INVALID_NLINK)) |
| reply_mask |= STATX_NLINK; |
| if (!(cache_validity & NFS_INO_INVALID_MODE)) |
| reply_mask |= STATX_MODE; |
| if (!(cache_validity & NFS_INO_INVALID_OTHER)) |
| reply_mask |= STATX_UID | STATX_GID; |
| if (!(cache_validity & NFS_INO_INVALID_BLOCKS)) |
| reply_mask |= STATX_BLOCKS; |
| if (!(cache_validity & NFS_INO_INVALID_CHANGE)) |
| reply_mask |= STATX_CHANGE_COOKIE; |
| return reply_mask; |
| } |
| |
| int nfs_getattr(struct mnt_idmap *idmap, 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; |
| bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode); |
| |
| trace_nfs_getattr_enter(inode); |
| |
| request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID | |
| STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME | |
| STATX_INO | STATX_SIZE | STATX_BLOCKS | |
| STATX_CHANGE_COOKIE; |
| |
| if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) { |
| if (readdirplus_enabled) |
| nfs_readdirplus_parent_cache_hit(path->dentry); |
| goto out_no_revalidate; |
| } |
| |
| /* Flush out writes to the server in order to update c/mtime/version. */ |
| if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_CHANGE_COOKIE)) && |
| S_ISREG(inode->i_mode)) { |
| if (nfs_have_delegated_mtime(inode)) |
| filemap_fdatawrite(inode->i_mapping); |
| else |
| filemap_write_and_wait(inode->i_mapping); |
| } |
| |
| /* |
| * 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| |
| STATX_CHANGE_COOKIE))) |
| 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_CHANGE; |
| if (request_mask & STATX_ATIME) |
| do_update |= cache_validity & NFS_INO_INVALID_ATIME; |
| if (request_mask & STATX_CTIME) |
| do_update |= cache_validity & NFS_INO_INVALID_CTIME; |
| if (request_mask & STATX_MTIME) |
| do_update |= cache_validity & NFS_INO_INVALID_MTIME; |
| if (request_mask & STATX_SIZE) |
| do_update |= cache_validity & NFS_INO_INVALID_SIZE; |
| if (request_mask & STATX_NLINK) |
| do_update |= cache_validity & NFS_INO_INVALID_NLINK; |
| if (request_mask & STATX_MODE) |
| do_update |= cache_validity & NFS_INO_INVALID_MODE; |
| if (request_mask & (STATX_UID | STATX_GID)) |
| do_update |= cache_validity & NFS_INO_INVALID_OTHER; |
| if (request_mask & STATX_BLOCKS) |
| do_update |= cache_validity & NFS_INO_INVALID_BLOCKS; |
| |
| if (do_update) { |
| if (readdirplus_enabled) |
| nfs_readdirplus_parent_cache_miss(path->dentry); |
| err = __nfs_revalidate_inode(server, inode); |
| if (err) |
| goto out; |
| } else if (readdirplus_enabled) |
| nfs_readdirplus_parent_cache_hit(path->dentry); |
| out_no_revalidate: |
| /* Only return attributes that were revalidated. */ |
| stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask; |
| |
| generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); |
| stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); |
| stat->change_cookie = inode_peek_iversion_raw(inode); |
| stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC; |
| if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED) |
| stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC; |
| 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_ACCOUNT); |
| 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; |
| |
| if (!(ctx->mode & FMODE_WRITE)) |
| return; |
| if (!is_sync) |
| return; |
| inode = d_inode(ctx->dentry); |
| if (nfs_have_read_or_write_delegation(inode)) |
| 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; |
| if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO) |
| return; |
| nfs_revalidate_inode(inode, |
| NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE); |
| } |
| 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_ACCOUNT); |
| 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(); |
| rcu_assign_pointer(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(rcu_dereference_protected(ctx->ll_cred, 1)); |
| 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) && |
| nfs_ooo_test(nfsi)) |
| 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); |
| set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags); |
| 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; |
| if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags)) |
| 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); |
| |
| clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags); |
| /* |
| * 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), |
| flags_to_mode(filp->f_flags), 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; |
| } |
| |
| /* |
| * 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 = 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_with_label(NFS_SERVER(inode)); |
| if (fattr == NULL) |
| goto out; |
| |
| nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); |
| |
| status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, 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 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 out; |
| } |
| |
| if (nfsi->cache_validity & NFS_INO_INVALID_ACL) |
| nfs_zap_acl_cache(inode); |
| |
| nfs_setsecurity(inode, fattr); |
| |
| dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", |
| inode->i_sb->s_id, |
| (unsigned long long)NFS_FILEID(inode)); |
| |
| 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 |
| * @inode: pointer to inode struct |
| * @flags: cache flags to check |
| * |
| * Updates inode attribute information by retrieving the data from the server. |
| */ |
| int nfs_revalidate_inode(struct inode *inode, unsigned long flags) |
| { |
| if (!nfs_check_cache_invalid(inode, flags)) |
| return NFS_STALE(inode) ? -ESTALE : 0; |
| return __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| } |
| EXPORT_SYMBOL_GPL(nfs_revalidate_inode); |
| |
| static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) |
| { |
| int ret; |
| |
| nfs_fscache_invalidate(inode, 0); |
| 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); |
| |
| 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|TASK_FREEZABLE_UNSAFE); |
| 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_ooo_clear(nfsi); |
| 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_INVALID_CHANGE) || |
| 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_get_ctime(inode); |
| if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) |
| && (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| && timespec64_equal(&ts, &fattr->pre_ctime)) { |
| inode_set_ctime_to_ts(inode, fattr->ctime); |
| } |
| |
| ts = inode_get_mtime(inode); |
| if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) |
| && (fattr->valid & NFS_ATTR_FATTR_MTIME) |
| && timespec64_equal(&ts, &fattr->pre_mtime)) { |
| inode_set_mtime_to_ts(inode, fattr->mtime); |
| } |
| 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)) { |
| trace_nfs_size_wcc(inode, fattr->size); |
| 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_have_delegated_attributes(inode)) |
| 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_wrong_type(inode, fattr->mode)) |
| 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; |
| |
| ts = inode_get_mtime(inode); |
| if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime)) |
| invalid |= NFS_INO_INVALID_MTIME; |
| |
| ts = inode_get_ctime(inode); |
| 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; |
| } |
| } |
| |
| /* 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_MODE; |
| if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) |
| invalid |= NFS_INO_INVALID_OTHER; |
| if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) |
| invalid |= 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_NLINK; |
| |
| ts = inode_get_atime(inode); |
| 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_KERNEL); |
| if (fattr != NULL) { |
| nfs_fattr_init(fattr); |
| fattr->label = NULL; |
| } |
| return fattr; |
| } |
| EXPORT_SYMBOL_GPL(nfs_alloc_fattr); |
| |
| struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server) |
| { |
| struct nfs_fattr *fattr = nfs_alloc_fattr(); |
| |
| if (!fattr) |
| return NULL; |
| |
| fattr->label = nfs4_label_alloc(server, GFP_KERNEL); |
| if (IS_ERR(fattr->label)) { |
| kfree(fattr); |
| return NULL; |
| } |
| |
| return fattr; |
| } |
| EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label); |
| |
| struct nfs_fh *nfs_alloc_fhandle(void) |
| { |
| struct nfs_fh *fh; |
| |
| fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL); |
| 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_cmp_generic - compare attributes |
| * @fattr: attributes |
| * @inode: pointer to inode |
| * |
| * Attempt to divine whether or not an RPC call reply carrying stale |
| * attributes got scheduled after another call carrying updated ones. |
| * Note also the check for wraparound of 'attr_gencount' |
| * |
| * The function returns '1' if it thinks the attributes in @fattr are |
| * more recent than the ones cached in @inode. Otherwise it returns |
| * the value '0'. |
| */ |
| static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr, |
| const struct inode *inode) |
| { |
| 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; |
| } |
| |
| /** |
| * nfs_inode_attrs_cmp_monotonic - compare attributes |
| * @fattr: attributes |
| * @inode: pointer to inode |
| * |
| * Attempt to divine whether or not an RPC call reply carrying stale |
| * attributes got scheduled after another call carrying updated ones. |
| * |
| * We assume that the server observes monotonic semantics for |
| * the change attribute, so a larger value means that the attributes in |
| * @fattr are more recent, in which case the function returns the |
| * value '1'. |
| * A return value of '0' indicates no measurable change |
| * A return value of '-1' means that the attributes in @inode are |
| * more recent. |
| */ |
| static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr, |
| const struct inode *inode) |
| { |
| s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode); |
| if (diff > 0) |
| return 1; |
| return diff == 0 ? 0 : -1; |
| } |
| |
| /** |
| * nfs_inode_attrs_cmp_strict_monotonic - compare attributes |
| * @fattr: attributes |
| * @inode: pointer to inode |
| * |
| * Attempt to divine whether or not an RPC call reply carrying stale |
| * attributes got scheduled after another call carrying updated ones. |
| * |
| * We assume that the server observes strictly monotonic semantics for |
| * the change attribute, so a larger value means that the attributes in |
| * @fattr are more recent, in which case the function returns the |
| * value '1'. |
| * A return value of '-1' means that the attributes in @inode are |
| * more recent or unchanged. |
| */ |
| static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr, |
| const struct inode *inode) |
| { |
| return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1; |
| } |
| |
| /** |
| * nfs_inode_attrs_cmp - compare attributes |
| * @fattr: attributes |
| * @inode: pointer to inode |
| * |
| * This function returns '1' if it thinks the attributes in @fattr are |
| * more recent than the ones cached in @inode. It returns '-1' if |
| * the attributes in @inode are more recent than the ones in @fattr, |
| * and it returns 0 if not sure. |
| */ |
| static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr, |
| const struct inode *inode) |
| { |
| if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0) |
| return 1; |
| switch (NFS_SERVER(inode)->change_attr_type) { |
| case NFS4_CHANGE_TYPE_IS_UNDEFINED: |
| break; |
| case NFS4_CHANGE_TYPE_IS_TIME_METADATA: |
| if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE)) |
| break; |
| return nfs_inode_attrs_cmp_monotonic(fattr, inode); |
| default: |
| if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE)) |
| break; |
| return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode); |
| } |
| return 0; |
| } |
| |
| /** |
| * nfs_inode_finish_partial_attr_update - complete a previous inode update |
| * @fattr: attributes |
| * @inode: pointer to inode |
| * |
| * Returns '1' if the last attribute update left the inode cached |
| * attributes in a partially unrevalidated state, and @fattr |
| * matches the change attribute of that partial update. |
| * Otherwise returns '0'. |
| */ |
| static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr, |
| const struct inode *inode) |
| { |
| const unsigned long check_valid = |
| NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME | |
| NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE | |
| NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER | |
| NFS_INO_INVALID_NLINK; |
| unsigned long cache_validity = NFS_I(inode)->cache_validity; |
| enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type; |
| |
| if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED && |
| !(cache_validity & NFS_INO_INVALID_CHANGE) && |
| (cache_validity & check_valid) != 0 && |
| (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && |
| nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0) |
| return 1; |
| return 0; |
| } |
| |
| static void nfs_ooo_merge(struct nfs_inode *nfsi, |
| u64 start, u64 end) |
| { |
| int i, cnt; |
| |
| if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER) |
| /* No point merging anything */ |
| return; |
| |
| if (!nfsi->ooo) { |
| nfsi->ooo = kmalloc(sizeof(*nfsi->ooo), GFP_ATOMIC); |
| if (!nfsi->ooo) { |
| nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER; |
| return; |
| } |
| nfsi->ooo->cnt = 0; |
| } |
| |
| /* add this range, merging if possible */ |
| cnt = nfsi->ooo->cnt; |
| for (i = 0; i < cnt; i++) { |
| if (end == nfsi->ooo->gap[i].start) |
| end = nfsi->ooo->gap[i].end; |
| else if (start == nfsi->ooo->gap[i].end) |
| start = nfsi->ooo->gap[i].start; |
| else |
| continue; |
| /* Remove 'i' from table and loop to insert the new range */ |
| cnt -= 1; |
| nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt]; |
| i = -1; |
| } |
| if (start != end) { |
| if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) { |
| nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER; |
| kfree(nfsi->ooo); |
| nfsi->ooo = NULL; |
| return; |
| } |
| nfsi->ooo->gap[cnt].start = start; |
| nfsi->ooo->gap[cnt].end = end; |
| cnt += 1; |
| } |
| nfsi->ooo->cnt = cnt; |
| } |
| |
| static void nfs_ooo_record(struct nfs_inode *nfsi, |
| struct nfs_fattr *fattr) |
| { |
| /* This reply was out-of-order, so record in the |
| * pre/post change id, possibly cancelling |
| * gaps created when iversion was jumpped forward. |
| */ |
| if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) && |
| (fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) |
| nfs_ooo_merge(nfsi, |
| fattr->change_attr, |
| fattr->pre_change_attr); |
| } |
| |
| static int nfs_refresh_inode_locked(struct inode *inode, |
| struct nfs_fattr *fattr) |
| { |
| int attr_cmp = nfs_inode_attrs_cmp(fattr, inode); |
| int ret = 0; |
| |
| trace_nfs_refresh_inode_enter(inode); |
| |
| if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode)) |
| ret = nfs_update_inode(inode, fattr); |
| else { |
| nfs_ooo_record(NFS_I(inode), fattr); |
| |
| if (attr_cmp == 0) |
| 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 attr_cmp = nfs_inode_attrs_cmp(fattr, inode); |
| int status; |
| |
| /* Don't do a WCC update if these attributes are already stale */ |
| if (attr_cmp < 0) |
| return 0; |
| if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) { |
| /* Record the pre/post change info before clearing PRECHANGE */ |
| nfs_ooo_record(NFS_I(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_get_ctime(inode); |
| 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_get_mtime(inode); |
| 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 = NFS_SERVER(inode); |
| struct nfs_inode *nfsi = NFS_I(inode); |
| loff_t cur_isize, new_isize; |
| u64 fattr_supported = server->fattr_valid; |
| 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_wrong_type(inode, fattr->mode)) { |
| /* |
| * 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; |
| } |
| |
| /* 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; |
| |
| /* Fix up any delegated attributes in the struct nfs_fattr */ |
| nfs_fattr_fixup_delegated(inode, fattr); |
| |
| save_cache_validity = nfsi->cache_validity; |
| nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_ATIME |
| | NFS_INO_REVAL_FORCED |
| | 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_CHANGE | NFS_INO_INVALID_CTIME | |
| NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE | |
| NFS_INO_INVALID_BLOCKS); |
| cache_revalidated = false; |
| } |
| |
| /* More cache consistency checks */ |
| if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { |
| if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 && |
| nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) { |
| /* There is one remaining gap that hasn't been |
| * merged into iversion - do that now. |
| */ |
| inode_set_iversion_raw(inode, nfsi->ooo->gap[0].start); |
| kfree(nfsi->ooo); |
| nfsi->ooo = NULL; |
| } |
| 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_BLOCKS |
| | NFS_INO_INVALID_NLINK |
| | NFS_INO_INVALID_MODE |
| | NFS_INO_INVALID_OTHER; |
| if (S_ISDIR(inode->i_mode)) |
| nfs_force_lookup_revalidate(inode); |
| attr_changed = true; |
| dprintk("NFS: change_attr change on server for file %s/%ld\n", |
| inode->i_sb->s_id, |
| inode->i_ino); |
| } else if (!have_delegation) { |
| nfs_ooo_record(nfsi, fattr); |
| nfs_ooo_merge(nfsi, inode_peek_iversion_raw(inode), |
| fattr->change_attr); |
| } |
| inode_set_iversion_raw(inode, fattr->change_attr); |
| } |
| } else { |
| nfsi->cache_validity |= |
| save_cache_validity & NFS_INO_INVALID_CHANGE; |
| if (!have_delegation || |
| (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0) |
| cache_revalidated = false; |
| } |
| |
| if (fattr->valid & NFS_ATTR_FATTR_MTIME) |
| inode_set_mtime_to_ts(inode, fattr->mtime); |
| else if (fattr_supported & NFS_ATTR_FATTR_MTIME) |
| nfsi->cache_validity |= |
| save_cache_validity & NFS_INO_INVALID_MTIME; |
| |
| if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| inode_set_ctime_to_ts(inode, fattr->ctime); |
| else if (fattr_supported & NFS_ATTR_FATTR_CTIME) |
| nfsi->cache_validity |= |
| save_cache_validity & NFS_INO_INVALID_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 && !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) { |
| trace_nfs_size_update(inode, new_isize); |
| i_size_write(inode, new_isize); |
| if (!have_writers) |
| invalid |= NFS_INO_INVALID_DATA; |
| } |
| } |
| if (new_isize == 0 && |
| !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED | |
| NFS_ATTR_FATTR_BLOCKS_USED))) { |
| fattr->du.nfs3.used = 0; |
| fattr->valid |= NFS_ATTR_FATTR_SPACE_USED; |
| } |
| } else |
| nfsi->cache_validity |= |
| save_cache_validity & NFS_INO_INVALID_SIZE; |
| |
| if (fattr->valid & NFS_ATTR_FATTR_ATIME) |
| inode_set_atime_to_ts(inode, fattr->atime); |
| else if (fattr_supported & NFS_ATTR_FATTR_ATIME) |
| nfsi->cache_validity |= |
| save_cache_validity & NFS_INO_INVALID_ATIME; |
| |
| 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; |
| } |
| } else if (fattr_supported & NFS_ATTR_FATTR_MODE) |
| nfsi->cache_validity |= |
| save_cache_validity & NFS_INO_INVALID_MODE; |
| |
| 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; |
| } |
| } else if (fattr_supported & NFS_ATTR_FATTR_OWNER) |
| nfsi->cache_validity |= |
| save_cache_validity & NFS_INO_INVALID_OTHER; |
| |
| 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; |
| } |
| } else if (fattr_supported & NFS_ATTR_FATTR_GROUP) |
| nfsi->cache_validity |= |
| save_cache_validity & NFS_INO_INVALID_OTHER; |
| |
| if (fattr->valid & NFS_ATTR_FATTR_NLINK) { |
| if (inode->i_nlink != fattr->nlink) |
| set_nlink(inode, fattr->nlink); |
| } else if (fattr_supported & NFS_ATTR_FATTR_NLINK) |
| nfsi->cache_validity |= |
| save_cache_validity & NFS_INO_INVALID_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); |
| } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED) |
| nfsi->cache_validity |= |
| save_cache_validity & NFS_INO_INVALID_BLOCKS; |
| |
| if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) |
| inode->i_blocks = fattr->du.nfs2.blocks; |
| else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED) |
| nfsi->cache_validity |= |
| save_cache_validity & NFS_INO_INVALID_BLOCKS; |
| |
| /* Update attrtimeo value if we're out of the unstable period */ |
| if (attr_changed) { |
| 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 = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL); |
| if (!nfsi) |
| return NULL; |
| nfsi->flags = 0UL; |
| nfsi->cache_validity = 0UL; |
| nfsi->ooo = NULL; |
| #if IS_ENABLED(CONFIG_NFS_V4) |
| nfsi->nfs4_acl = NULL; |
| #endif /* CONFIG_NFS_V4 */ |
| #ifdef CONFIG_NFS_V4_2 |
| nfsi->xattr_cache = NULL; |
| #endif |
| nfs_netfs_inode_init(nfsi); |
| |
| return &nfsi->vfs_inode; |
| } |
| EXPORT_SYMBOL_GPL(nfs_alloc_inode); |
| |
| void nfs_free_inode(struct inode *inode) |
| { |
| kfree(NFS_I(inode)->ooo); |
| 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 = 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); |
| 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_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 *nfslocaliod_workqueue; |
| struct workqueue_struct *nfsiod_workqueue; |
| EXPORT_SYMBOL_GPL(nfsiod_workqueue); |
| |
| /* |
| * Destroy the nfsiod workqueues |
| */ |
| static void nfsiod_stop(void) |
| { |
| struct workqueue_struct *wq; |
| |
| wq = nfsiod_workqueue; |
| if (wq != NULL) { |
| nfsiod_workqueue = NULL; |
| destroy_workqueue(wq); |
| } |
| #if IS_ENABLED(CONFIG_NFS_LOCALIO) |
| wq = nfslocaliod_workqueue; |
| if (wq != NULL) { |
| nfslocaliod_workqueue = NULL; |
| destroy_workqueue(wq); |
| } |
| #endif /* CONFIG_NFS_LOCALIO */ |
| } |
| |
| /* |
| * Start the nfsiod workqueues |
| */ |
| static int nfsiod_start(void) |
| { |
| dprintk("RPC: creating workqueue nfsiod\n"); |
| nfsiod_workqueue = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0); |
| if (nfsiod_workqueue == NULL) |
| return -ENOMEM; |
| #if IS_ENABLED(CONFIG_NFS_LOCALIO) |
| /* |
| * localio writes need to use a normal (non-memreclaim) workqueue. |
| * When we start getting low on space, XFS goes and calls flush_work() on |
| * a non-memreclaim work queue, which causes a priority inversion problem. |
| */ |
| dprintk("RPC: creating workqueue nfslocaliod\n"); |
| nfslocaliod_workqueue = alloc_workqueue("nfslocaliod", WQ_UNBOUND, 0); |
| if (unlikely(nfslocaliod_workqueue == NULL)) { |
| nfsiod_stop(); |
| return -ENOMEM; |
| } |
| #endif /* CONFIG_NFS_LOCALIO */ |
| return 0; |
| } |
| |
| unsigned int nfs_net_id; |
| EXPORT_SYMBOL_GPL(nfs_net_id); |
| |
| static int nfs_net_init(struct net *net) |
| { |
| struct nfs_net *nn = net_generic(net, nfs_net_id); |
| |
| nfs_clients_init(net); |
| |
| if (!rpc_proc_register(net, &nn->rpcstats)) { |
| nfs_clients_exit(net); |
| return -ENOMEM; |
| } |
| |
| return nfs_fs_proc_net_init(net); |
| } |
| |
| static void nfs_net_exit(struct net *net) |
| { |
| rpc_proc_unregister(net, "nfs"); |
| 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 = 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; |
| |
| err = register_nfs_fs(); |
| if (err) |
| goto out0; |
| |
| return 0; |
| out0: |
| 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: |
| 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(); |
| unregister_pernet_subsys(&nfs_net_ops); |
| unregister_nfs_fs(); |
| nfs_fs_proc_exit(); |
| nfsiod_stop(); |
| nfs_sysfs_exit(); |
| } |
| |
| /* Not quite true; I just maintain it */ |
| MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); |
| MODULE_DESCRIPTION("NFS client support"); |
| MODULE_LICENSE("GPL"); |
| module_param(enable_ino64, bool, 0644); |
| |
| module_init(init_nfs_fs) |
| module_exit(exit_nfs_fs) |
