| /* |
| * linux/fs/nfs/inode.c |
| * |
| * Copyright (C) 1992 Rick Sladkey |
| * |
| * nfs inode and superblock handling functions |
| * |
| * Modularised by Alan Cox <Alan.Cox@linux.org>, 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/config.h> |
| #include <linux/module.h> |
| #include <linux/init.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/nfs_fs.h> |
| #include <linux/nfs_mount.h> |
| #include <linux/nfs4_mount.h> |
| #include <linux/lockd/bind.h> |
| #include <linux/smp_lock.h> |
| #include <linux/seq_file.h> |
| #include <linux/mount.h> |
| #include <linux/nfs_idmap.h> |
| #include <linux/vfs.h> |
| |
| #include <asm/system.h> |
| #include <asm/uaccess.h> |
| |
| #include "nfs4_fs.h" |
| #include "delegation.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_VFS |
| #define NFS_PARANOIA 1 |
| |
| /* Maximum number of readahead requests |
| * FIXME: this should really be a sysctl so that users may tune it to suit |
| * their needs. People that do NFS over a slow network, might for |
| * instance want to reduce it to something closer to 1 for improved |
| * interactive response. |
| */ |
| #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) |
| |
| static void nfs_invalidate_inode(struct inode *); |
| static int nfs_update_inode(struct inode *, struct nfs_fattr *); |
| |
| static struct inode *nfs_alloc_inode(struct super_block *sb); |
| static void nfs_destroy_inode(struct inode *); |
| static int nfs_write_inode(struct inode *,int); |
| static void nfs_delete_inode(struct inode *); |
| static void nfs_clear_inode(struct inode *); |
| static void nfs_umount_begin(struct super_block *); |
| static int nfs_statfs(struct super_block *, struct kstatfs *); |
| static int nfs_show_options(struct seq_file *, struct vfsmount *); |
| static void nfs_zap_acl_cache(struct inode *); |
| |
| static struct rpc_program nfs_program; |
| |
| static struct super_operations nfs_sops = { |
| .alloc_inode = nfs_alloc_inode, |
| .destroy_inode = nfs_destroy_inode, |
| .write_inode = nfs_write_inode, |
| .delete_inode = nfs_delete_inode, |
| .statfs = nfs_statfs, |
| .clear_inode = nfs_clear_inode, |
| .umount_begin = nfs_umount_begin, |
| .show_options = nfs_show_options, |
| }; |
| |
| /* |
| * RPC cruft for NFS |
| */ |
| static struct rpc_stat nfs_rpcstat = { |
| .program = &nfs_program |
| }; |
| static struct rpc_version * nfs_version[] = { |
| NULL, |
| NULL, |
| &nfs_version2, |
| #if defined(CONFIG_NFS_V3) |
| &nfs_version3, |
| #elif defined(CONFIG_NFS_V4) |
| NULL, |
| #endif |
| #if defined(CONFIG_NFS_V4) |
| &nfs_version4, |
| #endif |
| }; |
| |
| static struct rpc_program nfs_program = { |
| .name = "nfs", |
| .number = NFS_PROGRAM, |
| .nrvers = sizeof(nfs_version) / sizeof(nfs_version[0]), |
| .version = nfs_version, |
| .stats = &nfs_rpcstat, |
| .pipe_dir_name = "/nfs", |
| }; |
| |
| #ifdef CONFIG_NFS_V3_ACL |
| static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; |
| static struct rpc_version * nfsacl_version[] = { |
| [3] = &nfsacl_version3, |
| }; |
| |
| struct rpc_program nfsacl_program = { |
| .name = "nfsacl", |
| .number = NFS_ACL_PROGRAM, |
| .nrvers = sizeof(nfsacl_version) / sizeof(nfsacl_version[0]), |
| .version = nfsacl_version, |
| .stats = &nfsacl_rpcstat, |
| }; |
| #endif /* CONFIG_NFS_V3_ACL */ |
| |
| static inline unsigned long |
| nfs_fattr_to_ino_t(struct nfs_fattr *fattr) |
| { |
| return nfs_fileid_to_ino_t(fattr->fileid); |
| } |
| |
| static int |
| nfs_write_inode(struct inode *inode, int sync) |
| { |
| int flags = sync ? FLUSH_WAIT : 0; |
| int ret; |
| |
| ret = nfs_commit_inode(inode, flags); |
| if (ret < 0) |
| return ret; |
| return 0; |
| } |
| |
| static void |
| nfs_delete_inode(struct inode * inode) |
| { |
| dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); |
| |
| truncate_inode_pages(&inode->i_data, 0); |
| |
| nfs_wb_all(inode); |
| /* |
| * The following should never happen... |
| */ |
| if (nfs_have_writebacks(inode)) { |
| printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino); |
| } |
| |
| clear_inode(inode); |
| } |
| |
| static void |
| nfs_clear_inode(struct inode *inode) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| struct rpc_cred *cred; |
| |
| nfs_wb_all(inode); |
| BUG_ON (!list_empty(&nfsi->open_files)); |
| nfs_zap_acl_cache(inode); |
| cred = nfsi->cache_access.cred; |
| if (cred) |
| put_rpccred(cred); |
| BUG_ON(atomic_read(&nfsi->data_updates) != 0); |
| } |
| |
| void |
| nfs_umount_begin(struct super_block *sb) |
| { |
| struct rpc_clnt *rpc = NFS_SB(sb)->client; |
| |
| /* -EIO all pending I/O */ |
| if (!IS_ERR(rpc)) |
| rpc_killall_tasks(rpc); |
| rpc = NFS_SB(sb)->client_acl; |
| if (!IS_ERR(rpc)) |
| rpc_killall_tasks(rpc); |
| } |
| |
| |
| static inline unsigned long |
| nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) |
| { |
| /* make sure blocksize is a power of two */ |
| if ((bsize & (bsize - 1)) || nrbitsp) { |
| unsigned char nrbits; |
| |
| for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) |
| ; |
| bsize = 1 << nrbits; |
| if (nrbitsp) |
| *nrbitsp = nrbits; |
| } |
| |
| return bsize; |
| } |
| |
| /* |
| * Calculate the number of 512byte blocks used. |
| */ |
| static inline unsigned long |
| nfs_calc_block_size(u64 tsize) |
| { |
| loff_t used = (tsize + 511) >> 9; |
| return (used > ULONG_MAX) ? ULONG_MAX : used; |
| } |
| |
| /* |
| * Compute and set NFS server blocksize |
| */ |
| static inline unsigned long |
| nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) |
| { |
| if (bsize < 1024) |
| bsize = NFS_DEF_FILE_IO_BUFFER_SIZE; |
| else if (bsize >= NFS_MAX_FILE_IO_BUFFER_SIZE) |
| bsize = NFS_MAX_FILE_IO_BUFFER_SIZE; |
| |
| return nfs_block_bits(bsize, nrbitsp); |
| } |
| |
| /* |
| * Obtain the root inode of the file system. |
| */ |
| static struct inode * |
| nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo) |
| { |
| struct nfs_server *server = NFS_SB(sb); |
| struct inode *rooti; |
| int error; |
| |
| error = server->rpc_ops->getroot(server, rootfh, fsinfo); |
| if (error < 0) { |
| dprintk("nfs_get_root: getattr error = %d\n", -error); |
| return ERR_PTR(error); |
| } |
| |
| rooti = nfs_fhget(sb, rootfh, fsinfo->fattr); |
| if (!rooti) |
| return ERR_PTR(-ENOMEM); |
| return rooti; |
| } |
| |
| /* |
| * Do NFS version-independent mount processing, and sanity checking |
| */ |
| static int |
| nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor) |
| { |
| struct nfs_server *server; |
| struct inode *root_inode; |
| struct nfs_fattr fattr; |
| struct nfs_fsinfo fsinfo = { |
| .fattr = &fattr, |
| }; |
| struct nfs_pathconf pathinfo = { |
| .fattr = &fattr, |
| }; |
| int no_root_error = 0; |
| unsigned long max_rpc_payload; |
| |
| /* We probably want something more informative here */ |
| snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); |
| |
| server = NFS_SB(sb); |
| |
| sb->s_magic = NFS_SUPER_MAGIC; |
| |
| root_inode = nfs_get_root(sb, &server->fh, &fsinfo); |
| /* Did getting the root inode fail? */ |
| if (IS_ERR(root_inode)) { |
| no_root_error = PTR_ERR(root_inode); |
| goto out_no_root; |
| } |
| sb->s_root = d_alloc_root(root_inode); |
| if (!sb->s_root) { |
| no_root_error = -ENOMEM; |
| goto out_no_root; |
| } |
| sb->s_root->d_op = server->rpc_ops->dentry_ops; |
| |
| /* Get some general file system info */ |
| if (server->namelen == 0 && |
| server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0) |
| server->namelen = pathinfo.max_namelen; |
| /* Work out a lot of parameters */ |
| if (server->rsize == 0) |
| server->rsize = nfs_block_size(fsinfo.rtpref, NULL); |
| if (server->wsize == 0) |
| server->wsize = nfs_block_size(fsinfo.wtpref, NULL); |
| |
| if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax) |
| server->rsize = nfs_block_size(fsinfo.rtmax, NULL); |
| if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax) |
| server->wsize = nfs_block_size(fsinfo.wtmax, NULL); |
| |
| max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); |
| if (server->rsize > max_rpc_payload) |
| server->rsize = max_rpc_payload; |
| if (server->wsize > max_rpc_payload) |
| server->wsize = max_rpc_payload; |
| |
| server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; |
| if (server->rpages > NFS_READ_MAXIOV) { |
| server->rpages = NFS_READ_MAXIOV; |
| server->rsize = server->rpages << PAGE_CACHE_SHIFT; |
| } |
| |
| server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; |
| if (server->wpages > NFS_WRITE_MAXIOV) { |
| server->wpages = NFS_WRITE_MAXIOV; |
| server->wsize = server->wpages << PAGE_CACHE_SHIFT; |
| } |
| |
| if (sb->s_blocksize == 0) |
| sb->s_blocksize = nfs_block_bits(server->wsize, |
| &sb->s_blocksize_bits); |
| server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL); |
| |
| server->dtsize = nfs_block_size(fsinfo.dtpref, NULL); |
| if (server->dtsize > PAGE_CACHE_SIZE) |
| server->dtsize = PAGE_CACHE_SIZE; |
| if (server->dtsize > server->rsize) |
| server->dtsize = server->rsize; |
| |
| if (server->flags & NFS_MOUNT_NOAC) { |
| server->acregmin = server->acregmax = 0; |
| server->acdirmin = server->acdirmax = 0; |
| sb->s_flags |= MS_SYNCHRONOUS; |
| } |
| server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; |
| |
| sb->s_maxbytes = fsinfo.maxfilesize; |
| if (sb->s_maxbytes > MAX_LFS_FILESIZE) |
| sb->s_maxbytes = MAX_LFS_FILESIZE; |
| |
| server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0; |
| server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0; |
| |
| /* We're airborne Set socket buffersize */ |
| rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); |
| return 0; |
| /* Yargs. It didn't work out. */ |
| out_no_root: |
| dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error); |
| if (!IS_ERR(root_inode)) |
| iput(root_inode); |
| return no_root_error; |
| } |
| |
| static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans) |
| { |
| to->to_initval = timeo * HZ / 10; |
| to->to_retries = retrans; |
| if (!to->to_retries) |
| to->to_retries = 2; |
| |
| switch (proto) { |
| case IPPROTO_TCP: |
| if (!to->to_initval) |
| to->to_initval = 60 * HZ; |
| if (to->to_initval > NFS_MAX_TCP_TIMEOUT) |
| to->to_initval = NFS_MAX_TCP_TIMEOUT; |
| to->to_increment = to->to_initval; |
| to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); |
| to->to_exponential = 0; |
| break; |
| case IPPROTO_UDP: |
| default: |
| if (!to->to_initval) |
| to->to_initval = 11 * HZ / 10; |
| if (to->to_initval > NFS_MAX_UDP_TIMEOUT) |
| to->to_initval = NFS_MAX_UDP_TIMEOUT; |
| to->to_maxval = NFS_MAX_UDP_TIMEOUT; |
| to->to_exponential = 1; |
| break; |
| } |
| } |
| |
| /* |
| * Create an RPC client handle. |
| */ |
| static struct rpc_clnt * |
| nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data) |
| { |
| struct rpc_timeout timeparms; |
| struct rpc_xprt *xprt = NULL; |
| struct rpc_clnt *clnt = NULL; |
| int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP; |
| |
| nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans); |
| |
| /* create transport and client */ |
| xprt = xprt_create_proto(proto, &server->addr, &timeparms); |
| if (IS_ERR(xprt)) { |
| dprintk("%s: cannot create RPC transport. Error = %ld\n", |
| __FUNCTION__, PTR_ERR(xprt)); |
| return (struct rpc_clnt *)xprt; |
| } |
| clnt = rpc_create_client(xprt, server->hostname, &nfs_program, |
| server->rpc_ops->version, data->pseudoflavor); |
| if (IS_ERR(clnt)) { |
| dprintk("%s: cannot create RPC client. Error = %ld\n", |
| __FUNCTION__, PTR_ERR(xprt)); |
| goto out_fail; |
| } |
| |
| clnt->cl_intr = 1; |
| clnt->cl_softrtry = 1; |
| clnt->cl_chatty = 1; |
| |
| return clnt; |
| |
| out_fail: |
| return clnt; |
| } |
| |
| /* |
| * The way this works is that the mount process passes a structure |
| * in the data argument which contains the server's IP address |
| * and the root file handle obtained from the server's mount |
| * daemon. We stash these away in the private superblock fields. |
| */ |
| static int |
| nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent) |
| { |
| struct nfs_server *server; |
| rpc_authflavor_t authflavor; |
| |
| server = NFS_SB(sb); |
| sb->s_blocksize_bits = 0; |
| sb->s_blocksize = 0; |
| if (data->bsize) |
| sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); |
| if (data->rsize) |
| server->rsize = nfs_block_size(data->rsize, NULL); |
| if (data->wsize) |
| server->wsize = nfs_block_size(data->wsize, NULL); |
| server->flags = data->flags & NFS_MOUNT_FLAGMASK; |
| |
| server->acregmin = data->acregmin*HZ; |
| server->acregmax = data->acregmax*HZ; |
| server->acdirmin = data->acdirmin*HZ; |
| server->acdirmax = data->acdirmax*HZ; |
| |
| /* Start lockd here, before we might error out */ |
| if (!(server->flags & NFS_MOUNT_NONLM)) |
| lockd_up(); |
| |
| server->namelen = data->namlen; |
| server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL); |
| if (!server->hostname) |
| return -ENOMEM; |
| strcpy(server->hostname, data->hostname); |
| |
| /* Check NFS protocol revision and initialize RPC op vector |
| * and file handle pool. */ |
| #ifdef CONFIG_NFS_V3 |
| if (server->flags & NFS_MOUNT_VER3) { |
| server->rpc_ops = &nfs_v3_clientops; |
| server->caps |= NFS_CAP_READDIRPLUS; |
| } else { |
| server->rpc_ops = &nfs_v2_clientops; |
| } |
| #else |
| server->rpc_ops = &nfs_v2_clientops; |
| #endif |
| |
| /* Fill in pseudoflavor for mount version < 5 */ |
| if (!(data->flags & NFS_MOUNT_SECFLAVOUR)) |
| data->pseudoflavor = RPC_AUTH_UNIX; |
| authflavor = data->pseudoflavor; /* save for sb_init() */ |
| /* XXX maybe we want to add a server->pseudoflavor field */ |
| |
| /* Create RPC client handles */ |
| server->client = nfs_create_client(server, data); |
| if (IS_ERR(server->client)) |
| return PTR_ERR(server->client); |
| /* RFC 2623, sec 2.3.2 */ |
| if (authflavor != RPC_AUTH_UNIX) { |
| struct rpc_auth *auth; |
| |
| server->client_sys = rpc_clone_client(server->client); |
| if (IS_ERR(server->client_sys)) |
| return PTR_ERR(server->client_sys); |
| auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys); |
| if (IS_ERR(auth)) |
| return PTR_ERR(auth); |
| } else { |
| atomic_inc(&server->client->cl_count); |
| server->client_sys = server->client; |
| } |
| if (server->flags & NFS_MOUNT_VER3) { |
| #ifdef CONFIG_NFS_V3_ACL |
| if (!(server->flags & NFS_MOUNT_NOACL)) { |
| server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); |
| /* No errors! Assume that Sun nfsacls are supported */ |
| if (!IS_ERR(server->client_acl)) |
| server->caps |= NFS_CAP_ACLS; |
| } |
| #else |
| server->flags &= ~NFS_MOUNT_NOACL; |
| #endif /* CONFIG_NFS_V3_ACL */ |
| /* |
| * The VFS shouldn't apply the umask to mode bits. We will |
| * do so ourselves when necessary. |
| */ |
| sb->s_flags |= MS_POSIXACL; |
| if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) |
| server->namelen = NFS3_MAXNAMLEN; |
| sb->s_time_gran = 1; |
| } else { |
| if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) |
| server->namelen = NFS2_MAXNAMLEN; |
| } |
| |
| sb->s_op = &nfs_sops; |
| return nfs_sb_init(sb, authflavor); |
| } |
| |
| static int |
| nfs_statfs(struct super_block *sb, struct kstatfs *buf) |
| { |
| struct nfs_server *server = NFS_SB(sb); |
| unsigned char blockbits; |
| unsigned long blockres; |
| struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode); |
| struct nfs_fattr fattr; |
| struct nfs_fsstat res = { |
| .fattr = &fattr, |
| }; |
| int error; |
| |
| lock_kernel(); |
| |
| error = server->rpc_ops->statfs(server, rootfh, &res); |
| buf->f_type = NFS_SUPER_MAGIC; |
| if (error < 0) |
| goto out_err; |
| |
| /* |
| * Current versions of glibc do not correctly handle the |
| * case where f_frsize != f_bsize. Eventually we want to |
| * report the value of wtmult in this field. |
| */ |
| buf->f_frsize = sb->s_blocksize; |
| |
| /* |
| * On most *nix systems, f_blocks, f_bfree, and f_bavail |
| * are reported in units of f_frsize. Linux hasn't had |
| * an f_frsize field in its statfs struct until recently, |
| * thus historically Linux's sys_statfs reports these |
| * fields in units of f_bsize. |
| */ |
| buf->f_bsize = sb->s_blocksize; |
| blockbits = sb->s_blocksize_bits; |
| blockres = (1 << blockbits) - 1; |
| buf->f_blocks = (res.tbytes + blockres) >> blockbits; |
| buf->f_bfree = (res.fbytes + blockres) >> blockbits; |
| buf->f_bavail = (res.abytes + blockres) >> blockbits; |
| |
| buf->f_files = res.tfiles; |
| buf->f_ffree = res.afiles; |
| |
| buf->f_namelen = server->namelen; |
| out: |
| unlock_kernel(); |
| |
| return 0; |
| |
| out_err: |
| printk(KERN_WARNING "nfs_statfs: statfs error = %d\n", -error); |
| buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; |
| goto out; |
| |
| } |
| |
| static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) |
| { |
| static struct proc_nfs_info { |
| int flag; |
| char *str; |
| char *nostr; |
| } nfs_info[] = { |
| { NFS_MOUNT_SOFT, ",soft", ",hard" }, |
| { NFS_MOUNT_INTR, ",intr", "" }, |
| { NFS_MOUNT_POSIX, ",posix", "" }, |
| { NFS_MOUNT_NOCTO, ",nocto", "" }, |
| { NFS_MOUNT_NOAC, ",noac", "" }, |
| { NFS_MOUNT_NONLM, ",nolock", ",lock" }, |
| { NFS_MOUNT_NOACL, ",noacl", "" }, |
| { 0, NULL, NULL } |
| }; |
| struct proc_nfs_info *nfs_infop; |
| struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); |
| char buf[12]; |
| char *proto; |
| |
| seq_printf(m, ",v%d", nfss->rpc_ops->version); |
| seq_printf(m, ",rsize=%d", nfss->rsize); |
| seq_printf(m, ",wsize=%d", nfss->wsize); |
| if (nfss->acregmin != 3*HZ) |
| seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ); |
| if (nfss->acregmax != 60*HZ) |
| seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ); |
| if (nfss->acdirmin != 30*HZ) |
| seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ); |
| if (nfss->acdirmax != 60*HZ) |
| seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ); |
| for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { |
| if (nfss->flags & nfs_infop->flag) |
| seq_puts(m, nfs_infop->str); |
| else |
| seq_puts(m, nfs_infop->nostr); |
| } |
| switch (nfss->client->cl_xprt->prot) { |
| case IPPROTO_TCP: |
| proto = "tcp"; |
| break; |
| case IPPROTO_UDP: |
| proto = "udp"; |
| break; |
| default: |
| snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot); |
| proto = buf; |
| } |
| seq_printf(m, ",proto=%s", proto); |
| seq_puts(m, ",addr="); |
| seq_escape(m, nfss->hostname, " \t\n\\"); |
| return 0; |
| } |
| |
| /** |
| * nfs_sync_mapping - helper to flush all mmapped dirty data to disk |
| */ |
| int nfs_sync_mapping(struct address_space *mapping) |
| { |
| int ret; |
| |
| if (mapping->nrpages == 0) |
| return 0; |
| unmap_mapping_range(mapping, 0, 0, 0); |
| ret = filemap_fdatawrite(mapping); |
| if (ret != 0) |
| goto out; |
| ret = filemap_fdatawait(mapping); |
| if (ret != 0) |
| goto out; |
| ret = nfs_wb_all(mapping->host); |
| out: |
| 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_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode); |
| NFS_ATTRTIMEO_UPDATE(inode) = 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); |
| } |
| |
| static 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); |
| } |
| |
| /* |
| * 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_FLAGS(inode)); |
| 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; |
| |
| 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 = NULL; |
| unsigned long hash; |
| |
| if ((fattr->valid & NFS_ATTR_FATTR) == 0) |
| goto out_no_inode; |
| |
| if (!fattr->nlink) { |
| printk("NFS: Buggy server - nlink == 0!\n"); |
| goto out_no_inode; |
| } |
| |
| hash = nfs_fattr_to_ino_t(fattr); |
| |
| if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc))) |
| goto out_no_inode; |
| |
| if (inode->i_state & I_NEW) { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| /* 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; |
| /* 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)->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)->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_FLAGS(inode)); |
| } else if (S_ISLNK(inode->i_mode)) |
| inode->i_op = &nfs_symlink_inode_operations; |
| else |
| init_special_inode(inode, inode->i_mode, fattr->rdev); |
| |
| nfsi->read_cache_jiffies = fattr->time_start; |
| nfsi->last_updated = jiffies; |
| inode->i_atime = fattr->atime; |
| inode->i_mtime = fattr->mtime; |
| inode->i_ctime = fattr->ctime; |
| if (fattr->valid & NFS_ATTR_FATTR_V4) |
| nfsi->change_attr = fattr->change_attr; |
| inode->i_size = nfs_size_to_loff_t(fattr->size); |
| inode->i_nlink = fattr->nlink; |
| inode->i_uid = fattr->uid; |
| inode->i_gid = fattr->gid; |
| if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { |
| /* |
| * report the blocks in 512byte units |
| */ |
| inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); |
| inode->i_blksize = inode->i_sb->s_blocksize; |
| } else { |
| inode->i_blocks = fattr->du.nfs2.blocks; |
| inode->i_blksize = fattr->du.nfs2.blocksize; |
| } |
| nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
| nfsi->attrtimeo_timestamp = jiffies; |
| memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); |
| nfsi->cache_access.cred = NULL; |
| |
| 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: |
| printk("nfs_fhget: iget failed\n"); |
| goto out; |
| } |
| |
| #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET) |
| |
| int |
| nfs_setattr(struct dentry *dentry, struct iattr *attr) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct nfs_fattr fattr; |
| int error; |
| |
| 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 == 0) |
| return 0; |
| |
| lock_kernel(); |
| nfs_begin_data_update(inode); |
| /* Write all dirty data if we're changing file permissions or size */ |
| if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) { |
| if (filemap_fdatawrite(inode->i_mapping) == 0) |
| filemap_fdatawait(inode->i_mapping); |
| nfs_wb_all(inode); |
| } |
| /* |
| * Return any delegations if we're going to change ACLs |
| */ |
| if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) |
| nfs_inode_return_delegation(inode); |
| error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr); |
| if (error == 0) |
| nfs_refresh_inode(inode, &fattr); |
| nfs_end_data_update(inode); |
| unlock_kernel(); |
| return error; |
| } |
| |
| /** |
| * 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) { |
| 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; |
| spin_lock(&inode->i_lock); |
| 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) { |
| inode->i_size = attr->ia_size; |
| vmtruncate(inode, attr->ia_size); |
| } |
| } |
| |
| static int nfs_wait_schedule(void *word) |
| { |
| if (signal_pending(current)) |
| return -ERESTARTSYS; |
| schedule(); |
| return 0; |
| } |
| |
| /* |
| * Wait for the inode to get unlocked. |
| */ |
| static int nfs_wait_on_inode(struct inode *inode) |
| { |
| struct rpc_clnt *clnt = NFS_CLIENT(inode); |
| struct nfs_inode *nfsi = NFS_I(inode); |
| sigset_t oldmask; |
| int error; |
| |
| rpc_clnt_sigmask(clnt, &oldmask); |
| error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING, |
| nfs_wait_schedule, TASK_INTERRUPTIBLE); |
| rpc_clnt_sigunmask(clnt, &oldmask); |
| |
| return error; |
| } |
| |
| static void nfs_wake_up_inode(struct inode *inode) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| clear_bit(NFS_INO_REVALIDATING, &nfsi->flags); |
| smp_mb__after_clear_bit(); |
| wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING); |
| } |
| |
| 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; |
| |
| if (__IS_FLG(inode, MS_NOATIME)) |
| need_atime = 0; |
| else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode)) |
| need_atime = 0; |
| /* We may force a getattr if the user cares about atime */ |
| 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); |
| return err; |
| } |
| |
| struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred) |
| { |
| struct nfs_open_context *ctx; |
| |
| ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL); |
| if (ctx != NULL) { |
| atomic_set(&ctx->count, 1); |
| ctx->dentry = dget(dentry); |
| ctx->cred = get_rpccred(cred); |
| ctx->state = NULL; |
| ctx->lockowner = current->files; |
| ctx->error = 0; |
| ctx->dir_cookie = 0; |
| } |
| return ctx; |
| } |
| |
| struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) |
| { |
| if (ctx != NULL) |
| atomic_inc(&ctx->count); |
| return ctx; |
| } |
| |
| void put_nfs_open_context(struct nfs_open_context *ctx) |
| { |
| if (atomic_dec_and_test(&ctx->count)) { |
| if (!list_empty(&ctx->list)) { |
| struct inode *inode = ctx->dentry->d_inode; |
| spin_lock(&inode->i_lock); |
| list_del(&ctx->list); |
| spin_unlock(&inode->i_lock); |
| } |
| if (ctx->state != NULL) |
| nfs4_close_state(ctx->state, ctx->mode); |
| if (ctx->cred != NULL) |
| put_rpccred(ctx->cred); |
| dput(ctx->dentry); |
| kfree(ctx); |
| } |
| } |
| |
| /* |
| * Ensure that mmap has a recent RPC credential for use when writing out |
| * shared pages |
| */ |
| void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) |
| { |
| struct inode *inode = filp->f_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, int mode) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| struct nfs_open_context *pos, *ctx = NULL; |
| |
| spin_lock(&inode->i_lock); |
| list_for_each_entry(pos, &nfsi->open_files, list) { |
| if (cred != NULL && pos->cred != cred) |
| continue; |
| if ((pos->mode & mode) == mode) { |
| ctx = get_nfs_open_context(pos); |
| break; |
| } |
| } |
| spin_unlock(&inode->i_lock); |
| return ctx; |
| } |
| |
| void nfs_file_clear_open_context(struct file *filp) |
| { |
| struct inode *inode = filp->f_dentry->d_inode; |
| struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data; |
| |
| 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); |
| } |
| } |
| |
| /* |
| * 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 = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); |
| if (IS_ERR(cred)) |
| return PTR_ERR(cred); |
| ctx = alloc_nfs_open_context(filp->f_dentry, cred); |
| put_rpccred(cred); |
| if (ctx == NULL) |
| return -ENOMEM; |
| ctx->mode = filp->f_mode; |
| nfs_file_set_open_context(filp, ctx); |
| put_nfs_open_context(ctx); |
| return 0; |
| } |
| |
| int nfs_release(struct inode *inode, struct file *filp) |
| { |
| nfs_file_clear_open_context(filp); |
| return 0; |
| } |
| |
| /* |
| * This function is called whenever some part of NFS notices that |
| * the cached attributes have to be refreshed. |
| */ |
| int |
| __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) |
| { |
| int status = -ESTALE; |
| struct nfs_fattr fattr; |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", |
| inode->i_sb->s_id, (long long)NFS_FILEID(inode)); |
| |
| lock_kernel(); |
| if (!inode || is_bad_inode(inode)) |
| goto out_nowait; |
| if (NFS_STALE(inode)) |
| goto out_nowait; |
| |
| status = nfs_wait_on_inode(inode); |
| if (status < 0) |
| goto out; |
| if (NFS_STALE(inode)) { |
| status = -ESTALE; |
| /* Do we trust the cached ESTALE? */ |
| if (NFS_ATTRTIMEO(inode) != 0) { |
| if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) { |
| /* no */ |
| } else |
| goto out; |
| } |
| } |
| |
| 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_FLAGS(inode)); |
| } |
| goto out; |
| } |
| |
| spin_lock(&inode->i_lock); |
| status = nfs_update_inode(inode, &fattr); |
| if (status) { |
| spin_unlock(&inode->i_lock); |
| 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; |
| } |
| spin_unlock(&inode->i_lock); |
| |
| nfs_revalidate_mapping(inode, inode->i_mapping); |
| |
| 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_wake_up_inode(inode); |
| |
| out_nowait: |
| unlock_kernel(); |
| return status; |
| } |
| |
| int nfs_attribute_timeout(struct inode *inode) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| if (nfs_have_delegation(inode, FMODE_READ)) |
| return 0; |
| return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo); |
| } |
| |
| /** |
| * nfs_revalidate_inode - Revalidate the inode attributes |
| * @server - pointer to nfs_server struct |
| * @inode - pointer to inode struct |
| * |
| * Updates inode attribute information by retrieving the data from the server. |
| */ |
| int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) |
| { |
| if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) |
| && !nfs_attribute_timeout(inode)) |
| return NFS_STALE(inode) ? -ESTALE : 0; |
| return __nfs_revalidate_inode(server, inode); |
| } |
| |
| /** |
| * nfs_revalidate_mapping - Revalidate the pagecache |
| * @inode - pointer to host inode |
| * @mapping - pointer to mapping |
| */ |
| void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| if (nfsi->cache_validity & NFS_INO_INVALID_DATA) { |
| if (S_ISREG(inode->i_mode)) |
| nfs_sync_mapping(mapping); |
| invalidate_inode_pages2(mapping); |
| |
| 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)); |
| /* This ensures we revalidate child dentries */ |
| nfsi->cache_change_attribute = jiffies; |
| } |
| spin_unlock(&inode->i_lock); |
| |
| dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", |
| inode->i_sb->s_id, |
| (long long)NFS_FILEID(inode)); |
| } |
| } |
| |
| /** |
| * nfs_begin_data_update |
| * @inode - pointer to inode |
| * Declare that a set of operations will update file data on the server |
| */ |
| void nfs_begin_data_update(struct inode *inode) |
| { |
| atomic_inc(&NFS_I(inode)->data_updates); |
| } |
| |
| /** |
| * nfs_end_data_update |
| * @inode - pointer to inode |
| * Declare end of the operations that will update file data |
| * This will mark the inode as immediately needing revalidation |
| * of its attribute cache. |
| */ |
| void nfs_end_data_update(struct inode *inode) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| if (!nfs_have_delegation(inode, FMODE_READ)) { |
| /* Directories and symlinks: invalidate page cache */ |
| if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) { |
| spin_lock(&inode->i_lock); |
| nfsi->cache_validity |= NFS_INO_INVALID_DATA; |
| spin_unlock(&inode->i_lock); |
| } |
| } |
| nfsi->cache_change_attribute = jiffies; |
| atomic_dec(&nfsi->data_updates); |
| } |
| |
| /** |
| * 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; |
| int data_unstable; |
| |
| |
| /* Are we in the process of updating data on the server? */ |
| data_unstable = nfs_caches_unstable(inode); |
| |
| if (fattr->valid & NFS_ATTR_FATTR_V4) { |
| if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0 |
| && nfsi->change_attr == fattr->pre_change_attr) |
| nfsi->change_attr = fattr->change_attr; |
| if (nfsi->change_attr != fattr->change_attr) { |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR; |
| if (!data_unstable) |
| nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE; |
| } |
| } |
| |
| if ((fattr->valid & NFS_ATTR_FATTR) == 0) { |
| return 0; |
| } |
| |
| /* Has the inode gone and changed behind our back? */ |
| if (nfsi->fileid != fattr->fileid |
| || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { |
| return -EIO; |
| } |
| |
| cur_size = i_size_read(inode); |
| new_isize = nfs_size_to_loff_t(fattr->size); |
| |
| /* If we have atomic WCC data, we may update some attributes */ |
| if ((fattr->valid & NFS_ATTR_WCC) != 0) { |
| if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) |
| memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); |
| if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) |
| memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); |
| } |
| |
| /* Verify a few of the more important attributes */ |
| if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR; |
| if (!data_unstable) |
| nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE; |
| } |
| if (cur_size != new_isize) { |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR; |
| if (nfsi->npages == 0) |
| nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE; |
| } |
| |
| /* Have any file permissions changed? */ |
| if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) |
| || inode->i_uid != fattr->uid |
| || inode->i_gid != fattr->gid) |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; |
| |
| /* Has the link count changed? */ |
| if (inode->i_nlink != fattr->nlink) |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR; |
| |
| if (!timespec_equal(&inode->i_atime, &fattr->atime)) |
| nfsi->cache_validity |= NFS_INO_INVALID_ATIME; |
| |
| nfsi->read_cache_jiffies = fattr->time_start; |
| return 0; |
| } |
| |
| /** |
| * 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) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| int status; |
| |
| if ((fattr->valid & NFS_ATTR_FATTR) == 0) |
| return 0; |
| spin_lock(&inode->i_lock); |
| nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE; |
| if (time_after(fattr->time_start, nfsi->last_updated)) |
| status = nfs_update_inode(inode, fattr); |
| else |
| status = nfs_check_inode_attributes(inode, fattr); |
| |
| spin_unlock(&inode->i_lock); |
| return status; |
| } |
| |
| /** |
| * 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. |
| */ |
| int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| int status = 0; |
| |
| spin_lock(&inode->i_lock); |
| if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) { |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS; |
| goto out; |
| } |
| status = nfs_update_inode(inode, fattr); |
| out: |
| 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_inode *nfsi = NFS_I(inode); |
| loff_t cur_isize, new_isize; |
| unsigned int invalid = 0; |
| int data_stable; |
| |
| dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n", |
| __FUNCTION__, inode->i_sb->s_id, inode->i_ino, |
| atomic_read(&inode->i_count), fattr->valid); |
| |
| if ((fattr->valid & NFS_ATTR_FATTR) == 0) |
| return 0; |
| |
| if (nfsi->fileid != fattr->fileid) { |
| printk(KERN_ERR "%s: inode number mismatch\n" |
| "expected (%s/0x%Lx), got (%s/0x%Lx)\n", |
| __FUNCTION__, |
| inode->i_sb->s_id, (long long)nfsi->fileid, |
| inode->i_sb->s_id, (long long)fattr->fileid); |
| goto out_err; |
| } |
| |
| /* |
| * Make sure the inode's type hasn't changed. |
| */ |
| if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) |
| goto out_changed; |
| |
| /* |
| * Update the read time so we don't revalidate too often. |
| */ |
| nfsi->read_cache_jiffies = fattr->time_start; |
| nfsi->last_updated = jiffies; |
| |
| /* Are we racing with known updates of the metadata on the server? */ |
| data_stable = nfs_verify_change_attribute(inode, fattr->time_start); |
| if (data_stable) |
| nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME); |
| |
| /* Check if our cached file size is stale */ |
| 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? */ |
| if (nfsi->npages == 0) { |
| /* No, but did we race with nfs_end_data_update()? */ |
| if (data_stable) { |
| inode->i_size = new_isize; |
| invalid |= NFS_INO_INVALID_DATA; |
| } |
| invalid |= NFS_INO_INVALID_ATTR; |
| } else if (new_isize > cur_isize) { |
| inode->i_size = new_isize; |
| invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; |
| } |
| nfsi->cache_change_attribute = jiffies; |
| dprintk("NFS: isize change on server for file %s/%ld\n", |
| inode->i_sb->s_id, inode->i_ino); |
| } |
| |
| /* Check if the mtime agrees */ |
| if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { |
| memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_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; |
| nfsi->cache_change_attribute = jiffies; |
| } |
| |
| if ((fattr->valid & NFS_ATTR_FATTR_V4) |
| && 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); |
| nfsi->change_attr = fattr->change_attr; |
| invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| nfsi->cache_change_attribute = jiffies; |
| } |
| |
| /* If ctime has changed we should definitely clear access+acl caches */ |
| if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) { |
| invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); |
| nfsi->cache_change_attribute = jiffies; |
| } |
| memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); |
| |
| if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) || |
| inode->i_uid != fattr->uid || |
| inode->i_gid != fattr->gid) |
| invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| |
| inode->i_mode = fattr->mode; |
| inode->i_nlink = fattr->nlink; |
| inode->i_uid = fattr->uid; |
| inode->i_gid = fattr->gid; |
| |
| if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { |
| /* |
| * report the blocks in 512byte units |
| */ |
| inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); |
| inode->i_blksize = inode->i_sb->s_blocksize; |
| } else { |
| inode->i_blocks = fattr->du.nfs2.blocks; |
| inode->i_blksize = fattr->du.nfs2.blocksize; |
| } |
| |
| /* Update attrtimeo value if we're out of the unstable period */ |
| if (invalid & NFS_INO_INVALID_ATTR) { |
| nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
| nfsi->attrtimeo_timestamp = jiffies; |
| } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) { |
| if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) |
| nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); |
| nfsi->attrtimeo_timestamp = jiffies; |
| } |
| /* 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 (data_stable) |
| invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE); |
| if (!nfs_have_delegation(inode, FMODE_READ)) |
| nfsi->cache_validity |= invalid; |
| |
| return 0; |
| out_changed: |
| /* |
| * Big trouble! The inode has become a different object. |
| */ |
| #ifdef NFS_PARANOIA |
| printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n", |
| __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode); |
| #endif |
| 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; |
| } |
| |
| /* |
| * File system information |
| */ |
| |
| static int nfs_set_super(struct super_block *s, void *data) |
| { |
| s->s_fs_info = data; |
| return set_anon_super(s, data); |
| } |
| |
| static int nfs_compare_super(struct super_block *sb, void *data) |
| { |
| struct nfs_server *server = data; |
| struct nfs_server *old = NFS_SB(sb); |
| |
| if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr) |
| return 0; |
| if (old->addr.sin_port != server->addr.sin_port) |
| return 0; |
| return !nfs_compare_fh(&old->fh, &server->fh); |
| } |
| |
| static struct super_block *nfs_get_sb(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *raw_data) |
| { |
| int error; |
| struct nfs_server *server = NULL; |
| struct super_block *s; |
| struct nfs_fh *root; |
| struct nfs_mount_data *data = raw_data; |
| |
| s = ERR_PTR(-EINVAL); |
| if (data == NULL) { |
| dprintk("%s: missing data argument\n", __FUNCTION__); |
| goto out_err; |
| } |
| if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) { |
| dprintk("%s: bad mount version\n", __FUNCTION__); |
| goto out_err; |
| } |
| switch (data->version) { |
| case 1: |
| data->namlen = 0; |
| case 2: |
| data->bsize = 0; |
| case 3: |
| if (data->flags & NFS_MOUNT_VER3) { |
| dprintk("%s: mount structure version %d does not support NFSv3\n", |
| __FUNCTION__, |
| data->version); |
| goto out_err; |
| } |
| data->root.size = NFS2_FHSIZE; |
| memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); |
| case 4: |
| if (data->flags & NFS_MOUNT_SECFLAVOUR) { |
| dprintk("%s: mount structure version %d does not support strong security\n", |
| __FUNCTION__, |
| data->version); |
| goto out_err; |
| } |
| case 5: |
| memset(data->context, 0, sizeof(data->context)); |
| } |
| #ifndef CONFIG_NFS_V3 |
| /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */ |
| s = ERR_PTR(-EPROTONOSUPPORT); |
| if (data->flags & NFS_MOUNT_VER3) { |
| dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__); |
| goto out_err; |
| } |
| #endif /* CONFIG_NFS_V3 */ |
| |
| s = ERR_PTR(-ENOMEM); |
| server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL); |
| if (!server) |
| goto out_err; |
| memset(server, 0, sizeof(struct nfs_server)); |
| /* Zero out the NFS state stuff */ |
| init_nfsv4_state(server); |
| server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL); |
| |
| root = &server->fh; |
| if (data->flags & NFS_MOUNT_VER3) |
| root->size = data->root.size; |
| else |
| root->size = NFS2_FHSIZE; |
| s = ERR_PTR(-EINVAL); |
| if (root->size > sizeof(root->data)) { |
| dprintk("%s: invalid root filehandle\n", __FUNCTION__); |
| goto out_err; |
| } |
| memcpy(root->data, data->root.data, root->size); |
| |
| /* We now require that the mount process passes the remote address */ |
| memcpy(&server->addr, &data->addr, sizeof(server->addr)); |
| if (server->addr.sin_addr.s_addr == INADDR_ANY) { |
| dprintk("%s: mount program didn't pass remote address!\n", |
| __FUNCTION__); |
| goto out_err; |
| } |
| |
| /* Fire up rpciod if not yet running */ |
| s = ERR_PTR(rpciod_up()); |
| if (IS_ERR(s)) { |
| dprintk("%s: couldn't start rpciod! Error = %ld\n", |
| __FUNCTION__, PTR_ERR(s)); |
| goto out_err; |
| } |
| |
| s = sget(fs_type, nfs_compare_super, nfs_set_super, server); |
| if (IS_ERR(s) || s->s_root) |
| goto out_rpciod_down; |
| |
| s->s_flags = flags; |
| |
| error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0); |
| if (error) { |
| up_write(&s->s_umount); |
| deactivate_super(s); |
| return ERR_PTR(error); |
| } |
| s->s_flags |= MS_ACTIVE; |
| return s; |
| out_rpciod_down: |
| rpciod_down(); |
| out_err: |
| kfree(server); |
| return s; |
| } |
| |
| static void nfs_kill_super(struct super_block *s) |
| { |
| struct nfs_server *server = NFS_SB(s); |
| |
| kill_anon_super(s); |
| |
| if (!IS_ERR(server->client)) |
| rpc_shutdown_client(server->client); |
| if (!IS_ERR(server->client_sys)) |
| rpc_shutdown_client(server->client_sys); |
| if (!IS_ERR(server->client_acl)) |
| rpc_shutdown_client(server->client_acl); |
| |
| if (!(server->flags & NFS_MOUNT_NONLM)) |
| lockd_down(); /* release rpc.lockd */ |
| |
| rpciod_down(); /* release rpciod */ |
| |
| kfree(server->hostname); |
| kfree(server); |
| } |
| |
| static struct file_system_type nfs_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "nfs", |
| .get_sb = nfs_get_sb, |
| .kill_sb = nfs_kill_super, |
| .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
| }; |
| |
| #ifdef CONFIG_NFS_V4 |
| |
| static void nfs4_clear_inode(struct inode *); |
| |
| |
| static struct super_operations nfs4_sops = { |
| .alloc_inode = nfs_alloc_inode, |
| .destroy_inode = nfs_destroy_inode, |
| .write_inode = nfs_write_inode, |
| .delete_inode = nfs_delete_inode, |
| .statfs = nfs_statfs, |
| .clear_inode = nfs4_clear_inode, |
| .umount_begin = nfs_umount_begin, |
| .show_options = nfs_show_options, |
| }; |
| |
| /* |
| * 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(). |
| */ |
| static void nfs4_clear_inode(struct inode *inode) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| /* If we are holding a delegation, return it! */ |
| nfs_inode_return_delegation(inode); |
| /* First call standard NFS clear_inode() code */ |
| nfs_clear_inode(inode); |
| /* Now clear out any remaining state */ |
| while (!list_empty(&nfsi->open_states)) { |
| struct nfs4_state *state; |
| |
| state = list_entry(nfsi->open_states.next, |
| struct nfs4_state, |
| inode_states); |
| dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n", |
| __FUNCTION__, |
| inode->i_sb->s_id, |
| (long long)NFS_FILEID(inode), |
| state); |
| BUG_ON(atomic_read(&state->count) != 1); |
| nfs4_close_state(state, state->state); |
| } |
| } |
| |
| |
| static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent) |
| { |
| struct nfs_server *server; |
| struct nfs4_client *clp = NULL; |
| struct rpc_xprt *xprt = NULL; |
| struct rpc_clnt *clnt = NULL; |
| struct rpc_timeout timeparms; |
| rpc_authflavor_t authflavour; |
| int err = -EIO; |
| |
| sb->s_blocksize_bits = 0; |
| sb->s_blocksize = 0; |
| server = NFS_SB(sb); |
| if (data->rsize != 0) |
| server->rsize = nfs_block_size(data->rsize, NULL); |
| if (data->wsize != 0) |
| server->wsize = nfs_block_size(data->wsize, NULL); |
| server->flags = data->flags & NFS_MOUNT_FLAGMASK; |
| server->caps = NFS_CAP_ATOMIC_OPEN; |
| |
| server->acregmin = data->acregmin*HZ; |
| server->acregmax = data->acregmax*HZ; |
| server->acdirmin = data->acdirmin*HZ; |
| server->acdirmax = data->acdirmax*HZ; |
| |
| server->rpc_ops = &nfs_v4_clientops; |
| |
| nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans); |
| |
| clp = nfs4_get_client(&server->addr.sin_addr); |
| if (!clp) { |
| dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__); |
| return -EIO; |
| } |
| |
| /* Now create transport and client */ |
| authflavour = RPC_AUTH_UNIX; |
| if (data->auth_flavourlen != 0) { |
| if (data->auth_flavourlen != 1) { |
| dprintk("%s: Invalid number of RPC auth flavours %d.\n", |
| __FUNCTION__, data->auth_flavourlen); |
| err = -EINVAL; |
| goto out_fail; |
| } |
| if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) { |
| err = -EFAULT; |
| goto out_fail; |
| } |
| } |
| |
| down_write(&clp->cl_sem); |
| if (IS_ERR(clp->cl_rpcclient)) { |
| xprt = xprt_create_proto(data->proto, &server->addr, &timeparms); |
| if (IS_ERR(xprt)) { |
| up_write(&clp->cl_sem); |
| err = PTR_ERR(xprt); |
| dprintk("%s: cannot create RPC transport. Error = %d\n", |
| __FUNCTION__, err); |
| goto out_fail; |
| } |
| clnt = rpc_create_client(xprt, server->hostname, &nfs_program, |
| server->rpc_ops->version, authflavour); |
| if (IS_ERR(clnt)) { |
| up_write(&clp->cl_sem); |
| err = PTR_ERR(clnt); |
| dprintk("%s: cannot create RPC client. Error = %d\n", |
| __FUNCTION__, err); |
| goto out_fail; |
| } |
| clnt->cl_intr = 1; |
| clnt->cl_softrtry = 1; |
| clnt->cl_chatty = 1; |
| clp->cl_rpcclient = clnt; |
| memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr)); |
| nfs_idmap_new(clp); |
| } |
| list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks); |
| clnt = rpc_clone_client(clp->cl_rpcclient); |
| if (!IS_ERR(clnt)) |
| server->nfs4_state = clp; |
| up_write(&clp->cl_sem); |
| clp = NULL; |
| |
| if (IS_ERR(clnt)) { |
| err = PTR_ERR(clnt); |
| dprintk("%s: cannot create RPC client. Error = %d\n", |
| __FUNCTION__, err); |
| return err; |
| } |
| |
| server->client = clnt; |
| |
| if (server->nfs4_state->cl_idmap == NULL) { |
| dprintk("%s: failed to create idmapper.\n", __FUNCTION__); |
| return -ENOMEM; |
| } |
| |
| if (clnt->cl_auth->au_flavor != authflavour) { |
| struct rpc_auth *auth; |
| |
| auth = rpcauth_create(authflavour, clnt); |
| if (IS_ERR(auth)) { |
| dprintk("%s: couldn't create credcache!\n", __FUNCTION__); |
| return PTR_ERR(auth); |
| } |
| } |
| |
| sb->s_time_gran = 1; |
| |
| sb->s_op = &nfs4_sops; |
| err = nfs_sb_init(sb, authflavour); |
| if (err == 0) |
| return 0; |
| out_fail: |
| if (clp) |
| nfs4_put_client(clp); |
| return err; |
| } |
| |
| static int nfs4_compare_super(struct super_block *sb, void *data) |
| { |
| struct nfs_server *server = data; |
| struct nfs_server *old = NFS_SB(sb); |
| |
| if (strcmp(server->hostname, old->hostname) != 0) |
| return 0; |
| if (strcmp(server->mnt_path, old->mnt_path) != 0) |
| return 0; |
| return 1; |
| } |
| |
| static void * |
| nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen) |
| { |
| void *p = NULL; |
| |
| if (!src->len) |
| return ERR_PTR(-EINVAL); |
| if (src->len < maxlen) |
| maxlen = src->len; |
| if (dst == NULL) { |
| p = dst = kmalloc(maxlen + 1, GFP_KERNEL); |
| if (p == NULL) |
| return ERR_PTR(-ENOMEM); |
| } |
| if (copy_from_user(dst, src->data, maxlen)) { |
| kfree(p); |
| return ERR_PTR(-EFAULT); |
| } |
| dst[maxlen] = '\0'; |
| return dst; |
| } |
| |
| static struct super_block *nfs4_get_sb(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *raw_data) |
| { |
| int error; |
| struct nfs_server *server; |
| struct super_block *s; |
| struct nfs4_mount_data *data = raw_data; |
| void *p; |
| |
| if (data == NULL) { |
| dprintk("%s: missing data argument\n", __FUNCTION__); |
| return ERR_PTR(-EINVAL); |
| } |
| if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) { |
| dprintk("%s: bad mount version\n", __FUNCTION__); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL); |
| if (!server) |
| return ERR_PTR(-ENOMEM); |
| memset(server, 0, sizeof(struct nfs_server)); |
| /* Zero out the NFS state stuff */ |
| init_nfsv4_state(server); |
| server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL); |
| |
| p = nfs_copy_user_string(NULL, &data->hostname, 256); |
| if (IS_ERR(p)) |
| goto out_err; |
| server->hostname = p; |
| |
| p = nfs_copy_user_string(NULL, &data->mnt_path, 1024); |
| if (IS_ERR(p)) |
| goto out_err; |
| server->mnt_path = p; |
| |
| p = nfs_copy_user_string(server->ip_addr, &data->client_addr, |
| sizeof(server->ip_addr) - 1); |
| if (IS_ERR(p)) |
| goto out_err; |
| |
| /* We now require that the mount process passes the remote address */ |
| if (data->host_addrlen != sizeof(server->addr)) { |
| s = ERR_PTR(-EINVAL); |
| goto out_free; |
| } |
| if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) { |
| s = ERR_PTR(-EFAULT); |
| goto out_free; |
| } |
| if (server->addr.sin_family != AF_INET || |
| server->addr.sin_addr.s_addr == INADDR_ANY) { |
| dprintk("%s: mount program didn't pass remote IP address!\n", |
| __FUNCTION__); |
| s = ERR_PTR(-EINVAL); |
| goto out_free; |
| } |
| |
| /* Fire up rpciod if not yet running */ |
| s = ERR_PTR(rpciod_up()); |
| if (IS_ERR(s)) { |
| dprintk("%s: couldn't start rpciod! Error = %ld\n", |
| __FUNCTION__, PTR_ERR(s)); |
| goto out_free; |
| } |
| |
| s = sget(fs_type, nfs4_compare_super, nfs_set_super, server); |
| |
| if (IS_ERR(s) || s->s_root) |
| goto out_free; |
| |
| s->s_flags = flags; |
| |
| error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0); |
| if (error) { |
| up_write(&s->s_umount); |
| deactivate_super(s); |
| return ERR_PTR(error); |
| } |
| s->s_flags |= MS_ACTIVE; |
| return s; |
| out_err: |
| s = (struct super_block *)p; |
| out_free: |
| kfree(server->mnt_path); |
| kfree(server->hostname); |
| kfree(server); |
| return s; |
| } |
| |
| static void nfs4_kill_super(struct super_block *sb) |
| { |
| struct nfs_server *server = NFS_SB(sb); |
| |
| nfs_return_all_delegations(sb); |
| kill_anon_super(sb); |
| |
| nfs4_renewd_prepare_shutdown(server); |
| |
| if (server->client != NULL && !IS_ERR(server->client)) |
| rpc_shutdown_client(server->client); |
| rpciod_down(); /* release rpciod */ |
| |
| destroy_nfsv4_state(server); |
| |
| kfree(server->hostname); |
| kfree(server); |
| } |
| |
| static struct file_system_type nfs4_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "nfs4", |
| .get_sb = nfs4_get_sb, |
| .kill_sb = nfs4_kill_super, |
| .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
| }; |
| |
| #define nfs4_init_once(nfsi) \ |
| do { \ |
| INIT_LIST_HEAD(&(nfsi)->open_states); \ |
| nfsi->delegation = NULL; \ |
| nfsi->delegation_state = 0; \ |
| init_rwsem(&nfsi->rwsem); \ |
| } while(0) |
| #define register_nfs4fs() register_filesystem(&nfs4_fs_type) |
| #define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type) |
| #else |
| #define nfs4_init_once(nfsi) \ |
| do { } while (0) |
| #define register_nfs4fs() (0) |
| #define unregister_nfs4fs() |
| #endif |
| |
| extern int nfs_init_nfspagecache(void); |
| extern void nfs_destroy_nfspagecache(void); |
| extern int nfs_init_readpagecache(void); |
| extern void nfs_destroy_readpagecache(void); |
| extern int nfs_init_writepagecache(void); |
| extern void nfs_destroy_writepagecache(void); |
| #ifdef CONFIG_NFS_DIRECTIO |
| extern int nfs_init_directcache(void); |
| extern void nfs_destroy_directcache(void); |
| #endif |
| |
| static kmem_cache_t * nfs_inode_cachep; |
| |
| static struct inode *nfs_alloc_inode(struct super_block *sb) |
| { |
| struct nfs_inode *nfsi; |
| nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL); |
| if (!nfsi) |
| return NULL; |
| nfsi->flags = 0UL; |
| nfsi->cache_validity = 0UL; |
| nfsi->cache_change_attribute = jiffies; |
| #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; |
| } |
| |
| static void nfs_destroy_inode(struct inode *inode) |
| { |
| kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); |
| } |
| |
| static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) |
| { |
| struct nfs_inode *nfsi = (struct nfs_inode *) foo; |
| |
| if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| SLAB_CTOR_CONSTRUCTOR) { |
| inode_init_once(&nfsi->vfs_inode); |
| spin_lock_init(&nfsi->req_lock); |
| INIT_LIST_HEAD(&nfsi->dirty); |
| INIT_LIST_HEAD(&nfsi->commit); |
| INIT_LIST_HEAD(&nfsi->open_files); |
| INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC); |
| atomic_set(&nfsi->data_updates, 0); |
| nfsi->ndirty = 0; |
| nfsi->ncommit = 0; |
| nfsi->npages = 0; |
| nfs4_init_once(nfsi); |
| } |
| } |
| |
| static int nfs_init_inodecache(void) |
| { |
| nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", |
| sizeof(struct nfs_inode), |
| 0, SLAB_RECLAIM_ACCOUNT, |
| init_once, NULL); |
| if (nfs_inode_cachep == NULL) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void nfs_destroy_inodecache(void) |
| { |
| if (kmem_cache_destroy(nfs_inode_cachep)) |
| printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n"); |
| } |
| |
| /* |
| * Initialize NFS |
| */ |
| static int __init init_nfs_fs(void) |
| { |
| int err; |
| |
| 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; |
| |
| #ifdef CONFIG_NFS_DIRECTIO |
| err = nfs_init_directcache(); |
| if (err) |
| goto out0; |
| #endif |
| |
| #ifdef CONFIG_PROC_FS |
| rpc_proc_register(&nfs_rpcstat); |
| #endif |
| err = register_filesystem(&nfs_fs_type); |
| if (err) |
| goto out; |
| if ((err = register_nfs4fs()) != 0) |
| goto out; |
| return 0; |
| out: |
| #ifdef CONFIG_PROC_FS |
| rpc_proc_unregister("nfs"); |
| #endif |
| nfs_destroy_writepagecache(); |
| #ifdef CONFIG_NFS_DIRECTIO |
| out0: |
| nfs_destroy_directcache(); |
| #endif |
| out1: |
| nfs_destroy_readpagecache(); |
| out2: |
| nfs_destroy_inodecache(); |
| out3: |
| nfs_destroy_nfspagecache(); |
| out4: |
| return err; |
| } |
| |
| static void __exit exit_nfs_fs(void) |
| { |
| #ifdef CONFIG_NFS_DIRECTIO |
| nfs_destroy_directcache(); |
| #endif |
| nfs_destroy_writepagecache(); |
| nfs_destroy_readpagecache(); |
| nfs_destroy_inodecache(); |
| nfs_destroy_nfspagecache(); |
| #ifdef CONFIG_PROC_FS |
| rpc_proc_unregister("nfs"); |
| #endif |
| unregister_filesystem(&nfs_fs_type); |
| unregister_nfs4fs(); |
| } |
| |
| /* Not quite true; I just maintain it */ |
| MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); |
| MODULE_LICENSE("GPL"); |
| |
| module_init(init_nfs_fs) |
| module_exit(exit_nfs_fs) |