diff options
Diffstat (limited to 'fs/nfs/inode.c')
| -rw-r--r-- | fs/nfs/inode.c | 2540 |
1 files changed, 2540 insertions, 0 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c new file mode 100644 index 0000000000..e21c073158 --- /dev/null +++ b/fs/nfs/inode.c @@ -0,0 +1,2540 @@ +// 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); + bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ); + + if (have_delegation) { + 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) +{ + 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); + } 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); + + memset(&inode->i_atime, 0, sizeof(inode->i_atime)); + memset(&inode->i_mtime, 0, sizeof(inode->i_mtime)); + 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->i_atime = 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->i_mtime = 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); + +#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; + } + + /* 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); + 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_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->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_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->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_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)) + 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_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; + 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->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 ((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_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_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->i_mtime; + 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->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_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->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 = 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; + + 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->i_mtime = 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->i_atime = 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_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 = 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: + 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); + 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 <okir@monad.swb.de>"); +MODULE_LICENSE("GPL"); +module_param(enable_ino64, bool, 0644); + +module_init(init_nfs_fs) +module_exit(exit_nfs_fs) |