| /* |
| * 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.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/nfs_idmap.h> |
| #include <linux/vfs.h> |
| #include <linux/inet.h> |
| #include <linux/nfs_xdr.h> |
| #include <linux/slab.h> |
| |
| #include <asm/system.h> |
| #include <asm/uaccess.h> |
| |
| #include "nfs4_fs.h" |
| #include "callback.h" |
| #include "delegation.h" |
| #include "iostat.h" |
| #include "internal.h" |
| #include "fscache.h" |
| #include "dns_resolve.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_VFS |
| |
| #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 |
| |
| /* Default is to see 64-bit inode numbers */ |
| static int enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; |
| |
| static void nfs_invalidate_inode(struct inode *); |
| 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); |
| } |
| |
| /** |
| * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks |
| * @word: long word containing the bit lock |
| */ |
| int nfs_wait_bit_killable(void *word) |
| { |
| if (fatal_signal_pending(current)) |
| return -ERESTARTSYS; |
| schedule(); |
| return 0; |
| } |
| |
| /** |
| * 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) |
| { |
| int ino; |
| |
| if (enable_ino64) |
| return fileid; |
| ino = fileid; |
| if (sizeof(ino) < sizeof(fileid)) |
| ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8; |
| return ino; |
| } |
| |
| void nfs_clear_inode(struct inode *inode) |
| { |
| /* |
| * The following should never happen... |
| */ |
| BUG_ON(nfs_have_writebacks(inode)); |
| BUG_ON(!list_empty(&NFS_I(inode)->open_files)); |
| nfs_zap_acl_cache(inode); |
| nfs_access_zap_cache(inode); |
| nfs_fscache_release_inode_cookie(inode); |
| } |
| |
| /** |
| * nfs_sync_mapping - helper to flush all mmapped dirty data to disk |
| */ |
| 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; |
| } |
| |
| /* |
| * 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; |
| |
| memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); |
| if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; |
| else |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; |
| } |
| |
| void nfs_zap_caches(struct inode *inode) |
| { |
| spin_lock(&inode->i_lock); |
| nfs_zap_caches_locked(inode); |
| spin_unlock(&inode->i_lock); |
| } |
| |
| void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) |
| { |
| if (mapping->nrpages != 0) { |
| spin_lock(&inode->i_lock); |
| NFS_I(inode)->cache_validity |= 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); |
| } |
| |
| void nfs_invalidate_atime(struct inode *inode) |
| { |
| spin_lock(&inode->i_lock); |
| NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; |
| spin_unlock(&inode->i_lock); |
| } |
| |
| /* |
| * Invalidate, but do not unhash, the inode. |
| * NB: must be called with inode->i_lock held! |
| */ |
| static void nfs_invalidate_inode(struct inode *inode) |
| { |
| set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); |
| nfs_zap_caches_locked(inode); |
| } |
| |
| struct nfs_find_desc { |
| struct nfs_fh *fh; |
| struct nfs_fattr *fattr; |
| }; |
| |
| /* |
| * In NFSv3 we can have 64bit inode numbers. In order to support |
| * this, and re-exported directories (also seen in NFSv2) |
| * we are forced to allow 2 different inodes to have the same |
| * i_ino. |
| */ |
| static int |
| nfs_find_actor(struct inode *inode, void *opaque) |
| { |
| struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; |
| struct nfs_fh *fh = desc->fh; |
| struct nfs_fattr *fattr = desc->fattr; |
| |
| if (NFS_FILEID(inode) != fattr->fileid) |
| return 0; |
| if (nfs_compare_fh(NFS_FH(inode), fh)) |
| return 0; |
| if (is_bad_inode(inode) || NFS_STALE(inode)) |
| return 0; |
| return 1; |
| } |
| |
| static int |
| nfs_init_locked(struct inode *inode, void *opaque) |
| { |
| struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; |
| struct nfs_fattr *fattr = desc->fattr; |
| |
| set_nfs_fileid(inode, fattr->fileid); |
| nfs_copy_fh(NFS_FH(inode), desc->fh); |
| return 0; |
| } |
| |
| /* Don't use READDIRPLUS on directories that we believe are too large */ |
| #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE) |
| |
| /* |
| * This is our front-end to iget that looks up inodes by file handle |
| * instead of inode number. |
| */ |
| struct inode * |
| nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) |
| { |
| struct nfs_find_desc desc = { |
| .fh = fh, |
| .fattr = fattr |
| }; |
| struct inode *inode = ERR_PTR(-ENOENT); |
| unsigned long hash; |
| |
| 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; |
| if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 |
| && nfs_server_capable(inode, NFS_CAP_MODE)) |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_ACCESS |
| | NFS_INO_INVALID_ACL; |
| /* 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_file_operations; |
| inode->i_data.a_ops = &nfs_file_aops; |
| inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info; |
| } else if (S_ISDIR(inode->i_mode)) { |
| inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; |
| inode->i_fop = &nfs_dir_operations; |
| if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS) |
| && fattr->size <= NFS_LIMIT_READDIRPLUS) |
| set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
| /* Deal with crossing mountpoints */ |
| if ((fattr->valid & NFS_ATTR_FATTR_FSID) |
| && !nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) { |
| if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) |
| inode->i_op = &nfs_referral_inode_operations; |
| else |
| inode->i_op = &nfs_mountpoint_inode_operations; |
| inode->i_fop = NULL; |
| set_bit(NFS_INO_MOUNTPOINT, &nfsi->flags); |
| } |
| } else if (S_ISLNK(inode->i_mode)) |
| inode->i_op = &nfs_symlink_inode_operations; |
| else |
| init_special_inode(inode, inode->i_mode, fattr->rdev); |
| |
| memset(&inode->i_atime, 0, sizeof(inode->i_atime)); |
| memset(&inode->i_mtime, 0, sizeof(inode->i_mtime)); |
| memset(&inode->i_ctime, 0, sizeof(inode->i_ctime)); |
| nfsi->change_attr = 0; |
| inode->i_size = 0; |
| inode->i_nlink = 0; |
| inode->i_uid = -2; |
| inode->i_gid = -2; |
| inode->i_blocks = 0; |
| memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); |
| |
| nfsi->read_cache_jiffies = fattr->time_start; |
| nfsi->attr_gencount = fattr->gencount; |
| if (fattr->valid & NFS_ATTR_FATTR_ATIME) |
| inode->i_atime = fattr->atime; |
| else if (nfs_server_capable(inode, NFS_CAP_ATIME)) |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR; |
| if (fattr->valid & NFS_ATTR_FATTR_MTIME) |
| inode->i_mtime = fattr->mtime; |
| else if (nfs_server_capable(inode, NFS_CAP_MTIME)) |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_DATA; |
| if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| inode->i_ctime = fattr->ctime; |
| else if (nfs_server_capable(inode, NFS_CAP_CTIME)) |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_ACCESS |
| | NFS_INO_INVALID_ACL; |
| if (fattr->valid & NFS_ATTR_FATTR_CHANGE) |
| nfsi->change_attr = fattr->change_attr; |
| else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR)) |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_DATA; |
| if (fattr->valid & NFS_ATTR_FATTR_SIZE) |
| inode->i_size = nfs_size_to_loff_t(fattr->size); |
| else |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_DATA |
| | NFS_INO_REVAL_PAGECACHE; |
| if (fattr->valid & NFS_ATTR_FATTR_NLINK) |
| inode->i_nlink = fattr->nlink; |
| else if (nfs_server_capable(inode, NFS_CAP_NLINK)) |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR; |
| if (fattr->valid & NFS_ATTR_FATTR_OWNER) |
| inode->i_uid = fattr->uid; |
| else if (nfs_server_capable(inode, NFS_CAP_OWNER)) |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_ACCESS |
| | NFS_INO_INVALID_ACL; |
| if (fattr->valid & NFS_ATTR_FATTR_GROUP) |
| inode->i_gid = fattr->gid; |
| else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP)) |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_ACCESS |
| | NFS_INO_INVALID_ACL; |
| if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) |
| inode->i_blocks = fattr->du.nfs2.blocks; |
| if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { |
| /* |
| * report the blocks in 512byte units |
| */ |
| inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); |
| } |
| nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
| nfsi->attrtimeo_timestamp = now; |
| nfsi->access_cache = RB_ROOT; |
| |
| nfs_fscache_init_inode_cookie(inode); |
| |
| unlock_new_inode(inode); |
| } else |
| nfs_refresh_inode(inode, fattr); |
| dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n", |
| inode->i_sb->s_id, |
| (long long)NFS_FILEID(inode), |
| atomic_read(&inode->i_count)); |
| |
| out: |
| return inode; |
| |
| out_no_inode: |
| dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); |
| goto out; |
| } |
| |
| #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE) |
| |
| int |
| nfs_setattr(struct dentry *dentry, struct iattr *attr) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct nfs_fattr *fattr; |
| int error = -ENOMEM; |
| |
| nfs_inc_stats(inode, NFSIOS_VFSSETATTR); |
| |
| /* skip mode change if it's just for clearing setuid/setgid */ |
| if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
| attr->ia_valid &= ~ATTR_MODE; |
| |
| if (attr->ia_valid & ATTR_SIZE) { |
| if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode)) |
| attr->ia_valid &= ~ATTR_SIZE; |
| } |
| |
| /* Optimization: if the end result is no change, don't RPC */ |
| attr->ia_valid &= NFS_VALID_ATTRS; |
| if ((attr->ia_valid & ~ATTR_FILE) == 0) |
| return 0; |
| |
| /* Write all dirty data */ |
| if (S_ISREG(inode->i_mode)) { |
| filemap_write_and_wait(inode->i_mapping); |
| nfs_wb_all(inode); |
| } |
| |
| fattr = nfs_alloc_fattr(); |
| if (fattr == NULL) |
| goto out; |
| /* |
| * Return any delegations if we're going to change ACLs |
| */ |
| if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) |
| nfs_inode_return_delegation(inode); |
| error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); |
| if (error == 0) |
| nfs_refresh_inode(inode, fattr); |
| nfs_free_fattr(fattr); |
| out: |
| return error; |
| } |
| |
| /** |
| * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall |
| * @inode: inode of the file used |
| * @offset: file offset to start truncating |
| * |
| * This is a copy of the common vmtruncate, but with the locking |
| * corrected to take into account the fact that NFS requires |
| * inode->i_size to be updated under the inode->i_lock. |
| */ |
| static int nfs_vmtruncate(struct inode * inode, loff_t offset) |
| { |
| loff_t oldsize; |
| int err; |
| |
| err = inode_newsize_ok(inode, offset); |
| if (err) |
| goto out; |
| |
| spin_lock(&inode->i_lock); |
| oldsize = inode->i_size; |
| i_size_write(inode, offset); |
| spin_unlock(&inode->i_lock); |
| |
| truncate_pagecache(inode, oldsize, offset); |
| out: |
| return err; |
| } |
| |
| /** |
| * nfs_setattr_update_inode - Update inode metadata after a setattr call. |
| * @inode: pointer to struct inode |
| * @attr: pointer to struct iattr |
| * |
| * Note: we do this in the *proc.c in order to ensure that |
| * it works for things like exclusive creates too. |
| */ |
| void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) |
| { |
| if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { |
| spin_lock(&inode->i_lock); |
| if ((attr->ia_valid & ATTR_MODE) != 0) { |
| int mode = attr->ia_mode & S_IALLUGO; |
| mode |= inode->i_mode & ~S_IALLUGO; |
| inode->i_mode = mode; |
| } |
| if ((attr->ia_valid & ATTR_UID) != 0) |
| inode->i_uid = attr->ia_uid; |
| if ((attr->ia_valid & ATTR_GID) != 0) |
| inode->i_gid = attr->ia_gid; |
| NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| spin_unlock(&inode->i_lock); |
| } |
| if ((attr->ia_valid & ATTR_SIZE) != 0) { |
| nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); |
| nfs_vmtruncate(inode, attr->ia_size); |
| } |
| } |
| |
| int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| { |
| struct inode *inode = dentry->d_inode; |
| int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; |
| int err; |
| |
| /* Flush out writes to the server in order to update c/mtime. */ |
| if (S_ISREG(inode->i_mode)) { |
| err = filemap_write_and_wait(inode->i_mapping); |
| if (err) |
| goto out; |
| } |
| |
| /* |
| * We may force a getattr if the user cares about atime. |
| * |
| * Note that we only have to check the vfsmount flags here: |
| * - NFS always sets S_NOATIME by so checking it would give a |
| * bogus result |
| * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is |
| * no point in checking those. |
| */ |
| if ((mnt->mnt_flags & MNT_NOATIME) || |
| ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) |
| need_atime = 0; |
| |
| if (need_atime) |
| err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| else |
| err = nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| if (!err) { |
| generic_fillattr(inode, stat); |
| stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); |
| } |
| out: |
| return err; |
| } |
| |
| static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) |
| { |
| atomic_set(&l_ctx->count, 1); |
| l_ctx->lockowner = current->files; |
| l_ctx->pid = current->tgid; |
| INIT_LIST_HEAD(&l_ctx->list); |
| } |
| |
| static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) |
| { |
| struct nfs_lock_context *pos; |
| |
| list_for_each_entry(pos, &ctx->lock_context.list, list) { |
| if (pos->lockowner != current->files) |
| continue; |
| if (pos->pid != current->tgid) |
| continue; |
| atomic_inc(&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 = ctx->path.dentry->d_inode; |
| |
| spin_lock(&inode->i_lock); |
| res = __nfs_find_lock_context(ctx); |
| if (res == NULL) { |
| spin_unlock(&inode->i_lock); |
| new = kmalloc(sizeof(*new), GFP_KERNEL); |
| if (new == NULL) |
| return NULL; |
| nfs_init_lock_context(new); |
| spin_lock(&inode->i_lock); |
| res = __nfs_find_lock_context(ctx); |
| if (res == NULL) { |
| list_add_tail(&new->list, &ctx->lock_context.list); |
| new->open_context = ctx; |
| res = new; |
| new = NULL; |
| } |
| } |
| spin_unlock(&inode->i_lock); |
| kfree(new); |
| return res; |
| } |
| |
| void nfs_put_lock_context(struct nfs_lock_context *l_ctx) |
| { |
| struct nfs_open_context *ctx = l_ctx->open_context; |
| struct inode *inode = ctx->path.dentry->d_inode; |
| |
| if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock)) |
| return; |
| list_del(&l_ctx->list); |
| spin_unlock(&inode->i_lock); |
| kfree(l_ctx); |
| } |
| |
| /** |
| * nfs_close_context - Common close_context() routine NFSv2/v3 |
| * @ctx: pointer to context |
| * @is_sync: is this a synchronous close |
| * |
| * always ensure that the attributes are up to date if we're mounted |
| * with close-to-open semantics |
| */ |
| void nfs_close_context(struct nfs_open_context *ctx, int is_sync) |
| { |
| struct inode *inode; |
| struct nfs_server *server; |
| |
| if (!(ctx->mode & FMODE_WRITE)) |
| return; |
| if (!is_sync) |
| return; |
| inode = ctx->path.dentry->d_inode; |
| if (!list_empty(&NFS_I(inode)->open_files)) |
| return; |
| server = NFS_SERVER(inode); |
| if (server->flags & NFS_MOUNT_NOCTO) |
| return; |
| nfs_revalidate_inode(server, inode); |
| } |
| |
| static struct nfs_open_context *alloc_nfs_open_context(struct path *path, struct rpc_cred *cred) |
| { |
| struct nfs_open_context *ctx; |
| |
| ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); |
| if (ctx != NULL) { |
| ctx->path = *path; |
| path_get(&ctx->path); |
| ctx->cred = get_rpccred(cred); |
| ctx->state = NULL; |
| ctx->flags = 0; |
| ctx->error = 0; |
| ctx->dir_cookie = 0; |
| nfs_init_lock_context(&ctx->lock_context); |
| ctx->lock_context.open_context = ctx; |
| } |
| return ctx; |
| } |
| |
| struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) |
| { |
| if (ctx != NULL) |
| atomic_inc(&ctx->lock_context.count); |
| return ctx; |
| } |
| |
| static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) |
| { |
| struct inode *inode = ctx->path.dentry->d_inode; |
| |
| if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock)) |
| return; |
| list_del(&ctx->list); |
| spin_unlock(&inode->i_lock); |
| NFS_PROTO(inode)->close_context(ctx, is_sync); |
| if (ctx->cred != NULL) |
| put_rpccred(ctx->cred); |
| path_put(&ctx->path); |
| kfree(ctx); |
| } |
| |
| void put_nfs_open_context(struct nfs_open_context *ctx) |
| { |
| __put_nfs_open_context(ctx, 0); |
| } |
| |
| /* |
| * Ensure that mmap has a recent RPC credential for use when writing out |
| * shared pages |
| */ |
| static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) |
| { |
| struct inode *inode = filp->f_path.dentry->d_inode; |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| filp->private_data = get_nfs_open_context(ctx); |
| spin_lock(&inode->i_lock); |
| list_add(&ctx->list, &nfsi->open_files); |
| spin_unlock(&inode->i_lock); |
| } |
| |
| /* |
| * Given an inode, search for an open context with the desired characteristics |
| */ |
| struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| struct nfs_open_context *pos, *ctx = NULL; |
| |
| spin_lock(&inode->i_lock); |
| list_for_each_entry(pos, &nfsi->open_files, list) { |
| if (cred != NULL && pos->cred != cred) |
| continue; |
| if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) |
| continue; |
| ctx = get_nfs_open_context(pos); |
| break; |
| } |
| spin_unlock(&inode->i_lock); |
| return ctx; |
| } |
| |
| static void nfs_file_clear_open_context(struct file *filp) |
| { |
| struct inode *inode = filp->f_path.dentry->d_inode; |
| struct nfs_open_context *ctx = nfs_file_open_context(filp); |
| |
| if (ctx) { |
| filp->private_data = NULL; |
| spin_lock(&inode->i_lock); |
| list_move_tail(&ctx->list, &NFS_I(inode)->open_files); |
| spin_unlock(&inode->i_lock); |
| __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1); |
| } |
| } |
| |
| /* |
| * These allocate and release file read/write context information. |
| */ |
| int nfs_open(struct inode *inode, struct file *filp) |
| { |
| struct nfs_open_context *ctx; |
| struct rpc_cred *cred; |
| |
| cred = rpc_lookup_cred(); |
| if (IS_ERR(cred)) |
| return PTR_ERR(cred); |
| ctx = alloc_nfs_open_context(&filp->f_path, cred); |
| put_rpccred(cred); |
| if (ctx == NULL) |
| return -ENOMEM; |
| ctx->mode = filp->f_mode; |
| nfs_file_set_open_context(filp, ctx); |
| put_nfs_open_context(ctx); |
| nfs_fscache_set_inode_cookie(inode, filp); |
| return 0; |
| } |
| |
| int nfs_release(struct inode *inode, struct file *filp) |
| { |
| nfs_file_clear_open_context(filp); |
| return 0; |
| } |
| |
| /* |
| * This function is called whenever some part of NFS notices that |
| * the cached attributes have to be refreshed. |
| */ |
| int |
| __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) |
| { |
| int status = -ESTALE; |
| struct nfs_fattr *fattr = NULL; |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", |
| inode->i_sb->s_id, (long long)NFS_FILEID(inode)); |
| |
| if (is_bad_inode(inode)) |
| goto out; |
| if (NFS_STALE(inode)) |
| goto out; |
| |
| status = -ENOMEM; |
| fattr = nfs_alloc_fattr(); |
| if (fattr == NULL) |
| goto out; |
| |
| nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); |
| status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr); |
| if (status != 0) { |
| dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", |
| inode->i_sb->s_id, |
| (long long)NFS_FILEID(inode), status); |
| if (status == -ESTALE) { |
| nfs_zap_caches(inode); |
| if (!S_ISDIR(inode->i_mode)) |
| set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); |
| } |
| goto out; |
| } |
| |
| status = nfs_refresh_inode(inode, fattr); |
| if (status) { |
| dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", |
| inode->i_sb->s_id, |
| (long long)NFS_FILEID(inode), status); |
| goto out; |
| } |
| |
| if (nfsi->cache_validity & NFS_INO_INVALID_ACL) |
| nfs_zap_acl_cache(inode); |
| |
| dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", |
| inode->i_sb->s_id, |
| (long long)NFS_FILEID(inode)); |
| |
| out: |
| nfs_free_fattr(fattr); |
| return status; |
| } |
| |
| 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 int nfs_attribute_cache_expired(struct inode *inode) |
| { |
| if (nfs_have_delegated_attributes(inode)) |
| return 0; |
| return nfs_attribute_timeout(inode); |
| } |
| |
| /** |
| * nfs_revalidate_inode - Revalidate the inode attributes |
| * @server - pointer to nfs_server struct |
| * @inode - pointer to inode struct |
| * |
| * Updates inode attribute information by retrieving the data from the server. |
| */ |
| int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) |
| { |
| if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR) |
| && !nfs_attribute_cache_expired(inode)) |
| return NFS_STALE(inode) ? -ESTALE : 0; |
| return __nfs_revalidate_inode(server, inode); |
| } |
| |
| static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| if (mapping->nrpages != 0) { |
| int ret = invalidate_inode_pages2(mapping); |
| if (ret < 0) |
| return ret; |
| } |
| spin_lock(&inode->i_lock); |
| nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; |
| if (S_ISDIR(inode->i_mode)) |
| memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); |
| spin_unlock(&inode->i_lock); |
| nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); |
| nfs_fscache_reset_inode_cookie(inode); |
| dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", |
| inode->i_sb->s_id, (long long)NFS_FILEID(inode)); |
| return 0; |
| } |
| |
| /** |
| * 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) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| int ret = 0; |
| |
| if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) |
| || nfs_attribute_cache_expired(inode) |
| || NFS_STALE(inode)) { |
| ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| if (ret < 0) |
| goto out; |
| } |
| if (nfsi->cache_validity & NFS_INO_INVALID_DATA) |
| ret = nfs_invalidate_mapping(inode, mapping); |
| out: |
| return ret; |
| } |
| |
| static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) |
| && (fattr->valid & NFS_ATTR_FATTR_CHANGE) |
| && nfsi->change_attr == fattr->pre_change_attr) { |
| nfsi->change_attr = fattr->change_attr; |
| if (S_ISDIR(inode->i_mode)) |
| nfsi->cache_validity |= NFS_INO_INVALID_DATA; |
| } |
| /* If we have atomic WCC data, we may update some attributes */ |
| if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) |
| && (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) |
| memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); |
| |
| if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) |
| && (fattr->valid & NFS_ATTR_FATTR_MTIME) |
| && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { |
| memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); |
| if (S_ISDIR(inode->i_mode)) |
| nfsi->cache_validity |= NFS_INO_INVALID_DATA; |
| } |
| if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) |
| && (fattr->valid & NFS_ATTR_FATTR_SIZE) |
| && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) |
| && nfsi->npages == 0) |
| i_size_write(inode, nfs_size_to_loff_t(fattr->size)); |
| } |
| |
| /** |
| * nfs_check_inode_attributes - verify consistency of the inode attribute cache |
| * @inode - pointer to inode |
| * @fattr - updated attributes |
| * |
| * Verifies the attribute cache. If we have just changed the attributes, |
| * so that fattr carries weak cache consistency data, then it may |
| * also update the ctime/mtime/change_attribute. |
| */ |
| static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| loff_t cur_size, new_isize; |
| unsigned long invalid = 0; |
| |
| |
| /* Has the inode gone and changed behind our back? */ |
| if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) |
| return -EIO; |
| if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) |
| return -EIO; |
| |
| if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && |
| nfsi->change_attr != fattr->change_attr) |
| invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; |
| |
| /* Verify a few of the more important attributes */ |
| if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime)) |
| invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; |
| |
| if (fattr->valid & NFS_ATTR_FATTR_SIZE) { |
| cur_size = i_size_read(inode); |
| new_isize = nfs_size_to_loff_t(fattr->size); |
| if (cur_size != new_isize && nfsi->npages == 0) |
| invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; |
| } |
| |
| /* Have any file permissions changed? */ |
| if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) |
| invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; |
| if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && inode->i_uid != fattr->uid) |
| invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; |
| if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && inode->i_gid != fattr->gid) |
| invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; |
| |
| /* Has the link count changed? */ |
| if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) |
| invalid |= NFS_INO_INVALID_ATTR; |
| |
| if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime)) |
| invalid |= NFS_INO_INVALID_ATIME; |
| |
| if (invalid != 0) |
| nfsi->cache_validity |= invalid; |
| |
| nfsi->read_cache_jiffies = fattr->time_start; |
| return 0; |
| } |
| |
| static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr) |
| { |
| if (!(fattr->valid & NFS_ATTR_FATTR_CTIME)) |
| return 0; |
| return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0; |
| } |
| |
| static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr) |
| { |
| if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) |
| return 0; |
| return nfs_size_to_loff_t(fattr->size) > i_size_read(inode); |
| } |
| |
| static atomic_long_t nfs_attr_generation_counter; |
| |
| static unsigned long nfs_read_attr_generation_counter(void) |
| { |
| return atomic_long_read(&nfs_attr_generation_counter); |
| } |
| |
| unsigned long nfs_inc_attr_generation_counter(void) |
| { |
| return atomic_long_inc_return(&nfs_attr_generation_counter); |
| } |
| |
| void nfs_fattr_init(struct nfs_fattr *fattr) |
| { |
| fattr->valid = 0; |
| fattr->time_start = jiffies; |
| fattr->gencount = nfs_inc_attr_generation_counter(); |
| } |
| |
| struct nfs_fattr *nfs_alloc_fattr(void) |
| { |
| struct nfs_fattr *fattr; |
| |
| fattr = kmalloc(sizeof(*fattr), GFP_NOFS); |
| if (fattr != NULL) |
| nfs_fattr_init(fattr); |
| return fattr; |
| } |
| |
| struct nfs_fh *nfs_alloc_fhandle(void) |
| { |
| struct nfs_fh *fh; |
| |
| fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); |
| if (fh != NULL) |
| fh->size = 0; |
| return fh; |
| } |
| |
| /** |
| * nfs_inode_attrs_need_update - check if the inode attributes need updating |
| * @inode - pointer to inode |
| * @fattr - attributes |
| * |
| * Attempt to divine whether or not an RPC call reply carrying stale |
| * attributes got scheduled after another call carrying updated ones. |
| * |
| * To do so, the function first assumes that a more recent ctime means |
| * that the attributes in fattr are newer, however it also attempt to |
| * catch the case where ctime either didn't change, or went backwards |
| * (if someone reset the clock on the server) by looking at whether |
| * or not this RPC call was started after the inode was last updated. |
| * Note also the check for wraparound of 'attr_gencount' |
| * |
| * The function returns 'true' if it thinks the attributes in 'fattr' are |
| * more recent than the ones cached in the inode. |
| * |
| */ |
| static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) |
| { |
| const struct nfs_inode *nfsi = NFS_I(inode); |
| |
| return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || |
| nfs_ctime_need_update(inode, fattr) || |
| nfs_size_need_update(inode, fattr) || |
| ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); |
| } |
| |
| static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) |
| { |
| if (nfs_inode_attrs_need_update(inode, fattr)) |
| return nfs_update_inode(inode, fattr); |
| return nfs_check_inode_attributes(inode, fattr); |
| } |
| |
| /** |
| * nfs_refresh_inode - try to update the inode attribute cache |
| * @inode - pointer to inode |
| * @fattr - updated attributes |
| * |
| * Check that an RPC call that returned attributes has not overlapped with |
| * other recent updates of the inode metadata, then decide whether it is |
| * safe to do a full update of the inode attributes, or whether just to |
| * call nfs_check_inode_attributes. |
| */ |
| int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) |
| { |
| int status; |
| |
| if ((fattr->valid & NFS_ATTR_FATTR) == 0) |
| return 0; |
| spin_lock(&inode->i_lock); |
| status = nfs_refresh_inode_locked(inode, fattr); |
| spin_unlock(&inode->i_lock); |
| |
| return status; |
| } |
| |
| static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; |
| if (S_ISDIR(inode->i_mode)) |
| nfsi->cache_validity |= NFS_INO_INVALID_DATA; |
| if ((fattr->valid & NFS_ATTR_FATTR) == 0) |
| return 0; |
| return nfs_refresh_inode_locked(inode, fattr); |
| } |
| |
| /** |
| * nfs_post_op_update_inode - try to update the inode attribute cache |
| * @inode - pointer to inode |
| * @fattr - updated attributes |
| * |
| * After an operation that has changed the inode metadata, mark the |
| * attribute cache as being invalid, then try to update it. |
| * |
| * NB: if the server didn't return any post op attributes, this |
| * function will force the retrieval of attributes before the next |
| * NFS request. Thus it should be used only for operations that |
| * are expected to change one or more attributes, to avoid |
| * unnecessary NFS requests and trips through nfs_update_inode(). |
| */ |
| int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
| { |
| int status; |
| |
| spin_lock(&inode->i_lock); |
| status = nfs_post_op_update_inode_locked(inode, fattr); |
| spin_unlock(&inode->i_lock); |
| return status; |
| } |
| |
| /** |
| * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache |
| * @inode - pointer to inode |
| * @fattr - updated attributes |
| * |
| * After an operation that has changed the inode metadata, mark the |
| * attribute cache as being invalid, then try to update it. Fake up |
| * weak cache consistency data, if none exist. |
| * |
| * This function is mainly designed to be used by the ->write_done() functions. |
| */ |
| int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) |
| { |
| int status; |
| |
| spin_lock(&inode->i_lock); |
| /* Don't do a WCC update if these attributes are already stale */ |
| if ((fattr->valid & NFS_ATTR_FATTR) == 0 || |
| !nfs_inode_attrs_need_update(inode, fattr)) { |
| fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE |
| | NFS_ATTR_FATTR_PRESIZE |
| | NFS_ATTR_FATTR_PREMTIME |
| | NFS_ATTR_FATTR_PRECTIME); |
| goto out_noforce; |
| } |
| if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && |
| (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { |
| fattr->pre_change_attr = NFS_I(inode)->change_attr; |
| fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; |
| } |
| if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && |
| (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { |
| memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); |
| fattr->valid |= NFS_ATTR_FATTR_PRECTIME; |
| } |
| if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && |
| (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { |
| memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); |
| fattr->valid |= NFS_ATTR_FATTR_PREMTIME; |
| } |
| if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && |
| (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { |
| fattr->pre_size = i_size_read(inode); |
| fattr->valid |= NFS_ATTR_FATTR_PRESIZE; |
| } |
| out_noforce: |
| status = nfs_post_op_update_inode_locked(inode, fattr); |
| spin_unlock(&inode->i_lock); |
| return status; |
| } |
| |
| /* |
| * Many nfs protocol calls return the new file attributes after |
| * an operation. Here we update the inode to reflect the state |
| * of the server's inode. |
| * |
| * This is a bit tricky because we have to make sure all dirty pages |
| * have been sent off to the server before calling invalidate_inode_pages. |
| * To make sure no other process adds more write requests while we try |
| * our best to flush them, we make them sleep during the attribute refresh. |
| * |
| * A very similar scenario holds for the dir cache. |
| */ |
| static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
| { |
| struct nfs_server *server; |
| struct nfs_inode *nfsi = NFS_I(inode); |
| loff_t cur_isize, new_isize; |
| unsigned long invalid = 0; |
| unsigned long now = jiffies; |
| unsigned long save_cache_validity; |
| |
| dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n", |
| __func__, inode->i_sb->s_id, inode->i_ino, |
| atomic_read(&inode->i_count), fattr->valid); |
| |
| if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) |
| goto out_fileid; |
| |
| /* |
| * Make sure the inode's type hasn't changed. |
| */ |
| if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) |
| goto out_changed; |
| |
| server = NFS_SERVER(inode); |
| /* Update the fsid? */ |
| if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && |
| !nfs_fsid_equal(&server->fsid, &fattr->fsid) && |
| !test_bit(NFS_INO_MOUNTPOINT, &nfsi->flags)) |
| server->fsid = fattr->fsid; |
| |
| /* |
| * Update the read time so we don't revalidate too often. |
| */ |
| nfsi->read_cache_jiffies = fattr->time_start; |
| |
| save_cache_validity = nfsi->cache_validity; |
| nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_ATIME |
| | NFS_INO_REVAL_FORCED |
| | NFS_INO_REVAL_PAGECACHE); |
| |
| /* Do atomic weak cache consistency updates */ |
| nfs_wcc_update_inode(inode, fattr); |
| |
| /* More cache consistency checks */ |
| if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { |
| if (nfsi->change_attr != fattr->change_attr) { |
| dprintk("NFS: change_attr change on server for file %s/%ld\n", |
| inode->i_sb->s_id, inode->i_ino); |
| invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| if (S_ISDIR(inode->i_mode)) |
| nfs_force_lookup_revalidate(inode); |
| nfsi->change_attr = fattr->change_attr; |
| } |
| } else if (server->caps & NFS_CAP_CHANGE_ATTR) |
| invalid |= save_cache_validity; |
| |
| if (fattr->valid & NFS_ATTR_FATTR_MTIME) { |
| /* NFSv2/v3: Check if the mtime agrees */ |
| if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { |
| dprintk("NFS: mtime change on server for file %s/%ld\n", |
| inode->i_sb->s_id, inode->i_ino); |
| invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; |
| if (S_ISDIR(inode->i_mode)) |
| nfs_force_lookup_revalidate(inode); |
| memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); |
| } |
| } else if (server->caps & NFS_CAP_MTIME) |
| invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_DATA |
| | NFS_INO_REVAL_PAGECACHE |
| | NFS_INO_REVAL_FORCED); |
| |
| if (fattr->valid & NFS_ATTR_FATTR_CTIME) { |
| /* If ctime has changed we should definitely clear access+acl caches */ |
| if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) { |
| invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| /* and probably clear data for a directory too as utimes can cause |
| * havoc with our cache. |
| */ |
| if (S_ISDIR(inode->i_mode)) { |
| invalid |= NFS_INO_INVALID_DATA; |
| nfs_force_lookup_revalidate(inode); |
| } |
| memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); |
| } |
| } else if (server->caps & NFS_CAP_CTIME) |
| invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_ACCESS |
| | NFS_INO_INVALID_ACL |
| | NFS_INO_REVAL_FORCED); |
| |
| /* Check if our cached file size is stale */ |
| if (fattr->valid & NFS_ATTR_FATTR_SIZE) { |
| new_isize = nfs_size_to_loff_t(fattr->size); |
| cur_isize = i_size_read(inode); |
| if (new_isize != cur_isize) { |
| /* Do we perhaps have any outstanding writes, or has |
| * the file grown beyond our last write? */ |
| if (nfsi->npages == 0 || new_isize > cur_isize) { |
| i_size_write(inode, new_isize); |
| invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; |
| } |
| dprintk("NFS: isize change on server for file %s/%ld\n", |
| inode->i_sb->s_id, inode->i_ino); |
| } |
| } else |
| invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| | NFS_INO_REVAL_PAGECACHE |
| | NFS_INO_REVAL_FORCED); |
| |
| |
| if (fattr->valid & NFS_ATTR_FATTR_ATIME) |
| memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); |
| else if (server->caps & NFS_CAP_ATIME) |
| invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME |
| | NFS_INO_REVAL_FORCED); |
| |
| 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_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| } |
| } else if (server->caps & NFS_CAP_MODE) |
| invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_ACCESS |
| | NFS_INO_INVALID_ACL |
| | NFS_INO_REVAL_FORCED); |
| |
| if (fattr->valid & NFS_ATTR_FATTR_OWNER) { |
| if (inode->i_uid != fattr->uid) { |
| invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| inode->i_uid = fattr->uid; |
| } |
| } else if (server->caps & NFS_CAP_OWNER) |
| invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_ACCESS |
| | NFS_INO_INVALID_ACL |
| | NFS_INO_REVAL_FORCED); |
| |
| if (fattr->valid & NFS_ATTR_FATTR_GROUP) { |
| if (inode->i_gid != fattr->gid) { |
| invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| inode->i_gid = fattr->gid; |
| } |
| } else if (server->caps & NFS_CAP_OWNER_GROUP) |
| invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| | NFS_INO_INVALID_ACCESS |
| | NFS_INO_INVALID_ACL |
| | NFS_INO_REVAL_FORCED); |
| |
| if (fattr->valid & NFS_ATTR_FATTR_NLINK) { |
| if (inode->i_nlink != fattr->nlink) { |
| invalid |= NFS_INO_INVALID_ATTR; |
| if (S_ISDIR(inode->i_mode)) |
| invalid |= NFS_INO_INVALID_DATA; |
| inode->i_nlink = fattr->nlink; |
| } |
| } else if (server->caps & NFS_CAP_NLINK) |
| invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| | NFS_INO_REVAL_FORCED); |
| |
| if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { |
| /* |
| * report the blocks in 512byte units |
| */ |
| inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); |
| } |
| if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) |
| inode->i_blocks = fattr->du.nfs2.blocks; |
| |
| /* Update attrtimeo value if we're out of the unstable period */ |
| if (invalid & NFS_INO_INVALID_ATTR) { |
| nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); |
| nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
| nfsi->attrtimeo_timestamp = now; |
| nfsi->attr_gencount = nfs_inc_attr_generation_counter(); |
| } else { |
| if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { |
| if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) |
| nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); |
| nfsi->attrtimeo_timestamp = now; |
| } |
| } |
| invalid &= ~NFS_INO_INVALID_ATTR; |
| /* Don't invalidate the data if we were to blame */ |
| if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) |
| || S_ISLNK(inode->i_mode))) |
| invalid &= ~NFS_INO_INVALID_DATA; |
| if (!nfs_have_delegation(inode, FMODE_READ) || |
| (save_cache_validity & NFS_INO_REVAL_FORCED)) |
| nfsi->cache_validity |= invalid; |
| |
| return 0; |
| out_changed: |
| /* |
| * Big trouble! The inode has become a different object. |
| */ |
| printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n", |
| __func__, inode->i_ino, inode->i_mode, fattr->mode); |
| out_err: |
| /* |
| * No need to worry about unhashing the dentry, as the |
| * lookup validation will know that the inode is bad. |
| * (But we fall through to invalidate the caches.) |
| */ |
| nfs_invalidate_inode(inode); |
| return -ESTALE; |
| |
| out_fileid: |
| printk(KERN_ERR "NFS: server %s error: fileid changed\n" |
| "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", |
| NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id, |
| (long long)nfsi->fileid, (long long)fattr->fileid); |
| goto out_err; |
| } |
| |
| |
| #ifdef CONFIG_NFS_V4 |
| |
| /* |
| * Clean out any remaining NFSv4 state that might be left over due |
| * to open() calls that passed nfs_atomic_lookup, but failed to call |
| * nfs_open(). |
| */ |
| void nfs4_clear_inode(struct inode *inode) |
| { |
| /* If we are holding a delegation, return it! */ |
| nfs_inode_return_delegation_noreclaim(inode); |
| /* First call standard NFS clear_inode() code */ |
| nfs_clear_inode(inode); |
| } |
| #endif |
| |
| struct inode *nfs_alloc_inode(struct super_block *sb) |
| { |
| struct nfs_inode *nfsi; |
| nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); |
| if (!nfsi) |
| return NULL; |
| nfsi->flags = 0UL; |
| nfsi->cache_validity = 0UL; |
| #ifdef CONFIG_NFS_V3_ACL |
| nfsi->acl_access = ERR_PTR(-EAGAIN); |
| nfsi->acl_default = ERR_PTR(-EAGAIN); |
| #endif |
| #ifdef CONFIG_NFS_V4 |
| nfsi->nfs4_acl = NULL; |
| #endif /* CONFIG_NFS_V4 */ |
| return &nfsi->vfs_inode; |
| } |
| |
| void nfs_destroy_inode(struct inode *inode) |
| { |
| kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); |
| } |
| |
| static inline void nfs4_init_once(struct nfs_inode *nfsi) |
| { |
| #ifdef CONFIG_NFS_V4 |
| INIT_LIST_HEAD(&nfsi->open_states); |
| nfsi->delegation = NULL; |
| nfsi->delegation_state = 0; |
| init_rwsem(&nfsi->rwsem); |
| #endif |
| } |
| |
| static void init_once(void *foo) |
| { |
| struct nfs_inode *nfsi = (struct nfs_inode *) foo; |
| |
| inode_init_once(&nfsi->vfs_inode); |
| INIT_LIST_HEAD(&nfsi->open_files); |
| INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); |
| INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); |
| INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC); |
| nfsi->npages = 0; |
| nfsi->ncommit = 0; |
| atomic_set(&nfsi->silly_count, 1); |
| INIT_HLIST_HEAD(&nfsi->silly_list); |
| init_waitqueue_head(&nfsi->waitqueue); |
| nfs4_init_once(nfsi); |
| } |
| |
| static int __init nfs_init_inodecache(void) |
| { |
| nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", |
| sizeof(struct nfs_inode), |
| 0, (SLAB_RECLAIM_ACCOUNT| |
| SLAB_MEM_SPREAD), |
| init_once); |
| if (nfs_inode_cachep == NULL) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void nfs_destroy_inodecache(void) |
| { |
| kmem_cache_destroy(nfs_inode_cachep); |
| } |
| |
| struct workqueue_struct *nfsiod_workqueue; |
| |
| /* |
| * start up the nfsiod workqueue |
| */ |
| static int nfsiod_start(void) |
| { |
| struct workqueue_struct *wq; |
| dprintk("RPC: creating workqueue nfsiod\n"); |
| wq = create_singlethread_workqueue("nfsiod"); |
| if (wq == NULL) |
| return -ENOMEM; |
| nfsiod_workqueue = wq; |
| return 0; |
| } |
| |
| /* |
| * Destroy the nfsiod workqueue |
| */ |
| static void nfsiod_stop(void) |
| { |
| struct workqueue_struct *wq; |
| |
| wq = nfsiod_workqueue; |
| if (wq == NULL) |
| return; |
| nfsiod_workqueue = NULL; |
| destroy_workqueue(wq); |
| } |
| |
| /* |
| * Initialize NFS |
| */ |
| static int __init init_nfs_fs(void) |
| { |
| int err; |
| |
| err = nfs_dns_resolver_init(); |
| if (err < 0) |
| goto out8; |
| |
| err = nfs_fscache_register(); |
| if (err < 0) |
| goto out7; |
| |
| err = nfsiod_start(); |
| if (err) |
| goto out6; |
| |
| err = nfs_fs_proc_init(); |
| if (err) |
| goto out5; |
| |
| err = nfs_init_nfspagecache(); |
| if (err) |
| goto out4; |
| |
| err = nfs_init_inodecache(); |
| if (err) |
| goto out3; |
| |
| err = nfs_init_readpagecache(); |
| if (err) |
| goto out2; |
| |
| err = nfs_init_writepagecache(); |
| if (err) |
| goto out1; |
| |
| err = nfs_init_directcache(); |
| if (err) |
| goto out0; |
| |
| #ifdef CONFIG_PROC_FS |
| rpc_proc_register(&nfs_rpcstat); |
| #endif |
| if ((err = register_nfs_fs()) != 0) |
| goto out; |
| return 0; |
| out: |
| #ifdef CONFIG_PROC_FS |
| rpc_proc_unregister("nfs"); |
| #endif |
| nfs_destroy_directcache(); |
| out0: |
| nfs_destroy_writepagecache(); |
| out1: |
| nfs_destroy_readpagecache(); |
| out2: |
| nfs_destroy_inodecache(); |
| out3: |
| nfs_destroy_nfspagecache(); |
| out4: |
| nfs_fs_proc_exit(); |
| out5: |
| nfsiod_stop(); |
| out6: |
| nfs_fscache_unregister(); |
| out7: |
| nfs_dns_resolver_destroy(); |
| out8: |
| return err; |
| } |
| |
| static void __exit exit_nfs_fs(void) |
| { |
| nfs_destroy_directcache(); |
| nfs_destroy_writepagecache(); |
| nfs_destroy_readpagecache(); |
| nfs_destroy_inodecache(); |
| nfs_destroy_nfspagecache(); |
| nfs_fscache_unregister(); |
| nfs_dns_resolver_destroy(); |
| #ifdef CONFIG_PROC_FS |
| rpc_proc_unregister("nfs"); |
| #endif |
| unregister_nfs_fs(); |
| nfs_fs_proc_exit(); |
| nfsiod_stop(); |
| } |
| |
| /* Not quite true; I just maintain it */ |
| MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); |
| MODULE_LICENSE("GPL"); |
| module_param(enable_ino64, bool, 0644); |
| |
| module_init(init_nfs_fs) |
| module_exit(exit_nfs_fs) |