diff options
Diffstat (limited to 'fs/nfs/inode.c')
| -rw-r--r-- | fs/nfs/inode.c | 2003 |
1 files changed, 2003 insertions, 0 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c new file mode 100644 index 000000000000..6345f26e87ee --- /dev/null +++ b/fs/nfs/inode.c @@ -0,0 +1,2003 @@ +/* + * 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 "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 *, unsigned long); + +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 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", +}; + +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, 0, 0, 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); + + 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); +} + +/* + * For the moment, the only task for the NFS clear_inode method is to + * release the mmap credential + */ +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)); + 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 nfs_server *server = NFS_SB(sb); + struct rpc_clnt *rpc; + + /* -EIO all pending I/O */ + if ((rpc = server->client) != NULL) + 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; +} + +/* + * 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 tcp = (data->flags & NFS_MOUNT_TCP); + + /* Initialize timeout values */ + timeparms.to_initval = data->timeo * HZ / 10; + timeparms.to_retries = data->retrans; + timeparms.to_maxval = tcp ? RPC_MAX_TCP_TIMEOUT : RPC_MAX_UDP_TIMEOUT; + timeparms.to_exponential = 1; + + if (!timeparms.to_initval) + timeparms.to_initval = (tcp ? 600 : 11) * HZ / 10; + if (!timeparms.to_retries) + timeparms.to_retries = 5; + + /* create transport and client */ + xprt = xprt_create_proto(tcp ? IPPROTO_TCP : IPPROTO_UDP, + &server->addr, &timeparms); + if (IS_ERR(xprt)) { + printk(KERN_WARNING "NFS: cannot create RPC transport.\n"); + return (struct rpc_clnt *)xprt; + } + clnt = rpc_create_client(xprt, server->hostname, &nfs_program, + server->rpc_ops->version, data->pseudoflavor); + if (IS_ERR(clnt)) { + printk(KERN_WARNING "NFS: cannot create RPC client.\n"); + goto out_fail; + } + + clnt->cl_intr = 1; + clnt->cl_softrtry = 1; + clnt->cl_chatty = 1; + + return clnt; + +out_fail: + xprt_destroy(xprt); + 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. */ + if (server->flags & NFS_MOUNT_VER3) { +#ifdef CONFIG_NFS_V3 + server->rpc_ops = &nfs_v3_clientops; + server->caps |= NFS_CAP_READDIRPLUS; + if (data->version < 4) { + printk(KERN_NOTICE "NFS: NFSv3 not supported by mount program.\n"); + return -EIO; + } +#else + printk(KERN_NOTICE "NFS: NFSv3 not supported.\n"); + return -EIO; +#endif + } else { + server->rpc_ops = &nfs_v2_clientops; + } + + /* 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) { + server->client_sys = rpc_clone_client(server->client); + if (IS_ERR(server->client_sys)) + return PTR_ERR(server->client_sys); + if (!rpcauth_create(RPC_AUTH_UNIX, server->client_sys)) + return -ENOMEM; + } else { + atomic_inc(&server->client->cl_count); + server->client_sys = server->client; + } + + if (server->flags & NFS_MOUNT_VER3) { + 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_TCP, ",tcp", ",udp" }, + { NFS_MOUNT_NOCTO, ",nocto", "" }, + { NFS_MOUNT_NOAC, ",noac", "" }, + { NFS_MOUNT_NONLM, ",nolock", ",lock" }, + { 0, NULL, NULL } + }; + struct proc_nfs_info *nfs_infop; + struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); + + 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); + } + seq_puts(m, ",addr="); + seq_escape(m, nfss->hostname, " \t\n\\"); + return 0; +} + +/* + * Invalidate the local caches + */ +void +nfs_zap_caches(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->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS; + else + nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS; +} + +/* + * Invalidate, but do not unhash, the inode + */ +static void +nfs_invalidate_inode(struct inode *inode) +{ + umode_t save_mode = inode->i_mode; + + make_bad_inode(inode); + inode->i_mode = save_mode; + nfs_zap_caches(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_file_inode_operations; + 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) + NFS_FLAGS(inode) |= NFS_INO_ADVISE_RDPLUS; + } 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->timestamp; + 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); + } + error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr); + if (error == 0) { + nfs_refresh_inode(inode, &fattr); + if ((attr->ia_valid & ATTR_MODE) != 0) { + int mode; + mode = inode->i_mode & ~S_IALLUGO; + mode |= attr->ia_mode & S_IALLUGO; + inode->i_mode = mode; + } + if ((attr->ia_valid & ATTR_UID) != 0) + inode->i_uid = attr->ia_uid; + if ((attr->ia_valid & ATTR_GID) != 0) + inode->i_gid = attr->ia_gid; + if ((attr->ia_valid & ATTR_SIZE) != 0) { + inode->i_size = attr->ia_size; + vmtruncate(inode, attr->ia_size); + } + } + if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) + NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS; + nfs_end_data_update(inode); + unlock_kernel(); + return error; +} + +/* + * Wait for the inode to get unlocked. + * (Used for NFS_INO_LOCKED and NFS_INO_REVALIDATING). + */ +static int +nfs_wait_on_inode(struct inode *inode, int flag) +{ + struct rpc_clnt *clnt = NFS_CLIENT(inode); + struct nfs_inode *nfsi = NFS_I(inode); + + int error; + if (!(NFS_FLAGS(inode) & flag)) + return 0; + atomic_inc(&inode->i_count); + error = nfs_wait_event(clnt, nfsi->nfs_i_wait, + !(NFS_FLAGS(inode) & flag)); + iput(inode); + return error; +} + +int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) +{ + struct inode *inode = dentry->d_inode; + struct nfs_inode *nfsi = NFS_I(inode); + int need_atime = nfsi->flags & 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; + init_waitqueue_head(&ctx->waitq); + } + 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); +} + +struct nfs_open_context *nfs_find_open_context(struct inode *inode, 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 ((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); + if ((filp->f_mode & FMODE_WRITE) != 0) + nfs_begin_data_update(inode); + return 0; +} + +int nfs_release(struct inode *inode, struct file *filp) +{ + if ((filp->f_mode & FMODE_WRITE) != 0) + nfs_end_data_update(inode); + 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); + unsigned long verifier; + unsigned int flags; + + 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; + + while (NFS_REVALIDATING(inode)) { + status = nfs_wait_on_inode(inode, NFS_INO_REVALIDATING); + if (status < 0) + goto out_nowait; + if (NFS_ATTRTIMEO(inode) == 0) + continue; + if (NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) + continue; + status = NFS_STALE(inode) ? -ESTALE : 0; + goto out_nowait; + } + NFS_FLAGS(inode) |= NFS_INO_REVALIDATING; + + /* Protect against RPC races by saving the change attribute */ + verifier = nfs_save_change_attribute(inode); + 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)) + NFS_FLAGS(inode) |= NFS_INO_STALE; + } + goto out; + } + + status = nfs_update_inode(inode, &fattr, verifier); + 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; + } + flags = nfsi->flags; + /* + * We may need to keep the attributes marked as invalid if + * we raced with nfs_end_attr_update(). + */ + if (verifier == nfsi->cache_change_attribute) + nfsi->flags &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME); + /* Do the page cache invalidation */ + if (flags & NFS_INO_INVALID_DATA) { + if (S_ISREG(inode->i_mode)) { + if (filemap_fdatawrite(inode->i_mapping) == 0) + filemap_fdatawait(inode->i_mapping); + nfs_wb_all(inode); + } + nfsi->flags &= ~NFS_INO_INVALID_DATA; + invalidate_inode_pages2(inode->i_mapping); + memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); + dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", + inode->i_sb->s_id, + (long long)NFS_FILEID(inode)); + /* This ensures we revalidate dentries */ + nfsi->cache_change_attribute++; + } + dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", + inode->i_sb->s_id, + (long long)NFS_FILEID(inode)); + +out: + NFS_FLAGS(inode) &= ~NFS_INO_REVALIDATING; + wake_up(&nfsi->nfs_i_wait); + 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_FLAGS(inode) & (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_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)) { + /* Mark the attribute cache for revalidation */ + nfsi->flags |= NFS_INO_INVALID_ATTR; + /* Directories and symlinks: invalidate page cache too */ + if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) + nfsi->flags |= NFS_INO_INVALID_DATA; + } + nfsi->cache_change_attribute ++; + atomic_dec(&nfsi->data_updates); +} + +/** + * nfs_end_data_update_defer + * @inode - pointer to inode + * Declare end of the operations that will update file data + * This will defer marking the inode as needing revalidation + * unless there are no other pending updates. + */ +void nfs_end_data_update_defer(struct inode *inode) +{ + struct nfs_inode *nfsi = NFS_I(inode); + + if (atomic_dec_and_test(&nfsi->data_updates)) { + /* Mark the attribute cache for revalidation */ + nfsi->flags |= NFS_INO_INVALID_ATTR; + /* Directories and symlinks: invalidate page cache too */ + if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) + nfsi->flags |= NFS_INO_INVALID_DATA; + nfsi->cache_change_attribute ++; + } +} + +/** + * nfs_refresh_inode - 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. + */ +int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) +{ + struct nfs_inode *nfsi = NFS_I(inode); + loff_t cur_size, new_isize; + int data_unstable; + + /* Do we hold a delegation? */ + if (nfs_have_delegation(inode, FMODE_READ)) + return 0; + + /* 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 (!data_unstable && nfsi->change_attr != fattr->change_attr) + nfsi->flags |= NFS_INO_INVALID_ATTR; + } + + 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 (!data_unstable) { + if (!timespec_equal(&inode->i_mtime, &fattr->mtime) + || cur_size != new_isize) + nfsi->flags |= NFS_INO_INVALID_ATTR; + } else if (S_ISREG(inode->i_mode) && new_isize > cur_size) + nfsi->flags |= NFS_INO_INVALID_ATTR; + + /* 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->flags |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS; + + /* Has the link count changed? */ + if (inode->i_nlink != fattr->nlink) + nfsi->flags |= NFS_INO_INVALID_ATTR; + + if (!timespec_equal(&inode->i_atime, &fattr->atime)) + nfsi->flags |= NFS_INO_INVALID_ATIME; + + nfsi->read_cache_jiffies = fattr->timestamp; + return 0; +} + +/* + * 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, unsigned long verifier) +{ + struct nfs_inode *nfsi = NFS_I(inode); + __u64 new_size; + loff_t new_isize; + unsigned int invalid = 0; + loff_t cur_isize; + int data_unstable; + + 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->timestamp; + + /* Are we racing with known updates of the metadata on the server? */ + data_unstable = ! nfs_verify_change_attribute(inode, verifier); + + /* Check if the file size agrees */ + new_size = fattr->size; + new_isize = nfs_size_to_loff_t(fattr->size); + cur_isize = i_size_read(inode); + if (cur_isize != new_size) { +#ifdef NFS_DEBUG_VERBOSE + printk(KERN_DEBUG "NFS: isize change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino); +#endif + /* + * If we have pending writebacks, things can get + * messy. + */ + if (S_ISREG(inode->i_mode) && data_unstable) { + if (new_isize > cur_isize) { + inode->i_size = new_isize; + invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; + } + } else { + inode->i_size = new_isize; + invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; + } + } + + /* + * Note: we don't check inode->i_mtime since pipes etc. + * can change this value in VFS without requiring a + * cache revalidation. + */ + if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { + memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); +#ifdef NFS_DEBUG_VERBOSE + printk(KERN_DEBUG "NFS: mtime change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino); +#endif + if (!data_unstable) + invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; + } + + if ((fattr->valid & NFS_ATTR_FATTR_V4) + && nfsi->change_attr != fattr->change_attr) { +#ifdef NFS_DEBUG_VERBOSE + printk(KERN_DEBUG "NFS: change_attr change on %s/%ld\n", + inode->i_sb->s_id, inode->i_ino); +#endif + nfsi->change_attr = fattr->change_attr; + if (!data_unstable) + invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS; + } + + memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); + 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; + + 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 (!nfs_have_delegation(inode, FMODE_READ)) + nfsi->flags |= 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 + /* + * 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); + out_err: + NFS_FLAGS(inode) |= NFS_INO_STALE; + 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; + struct super_block *s; + struct nfs_fh *root; + struct nfs_mount_data *data = raw_data; + + if (!data) { + printk("nfs_read_super: missing data argument\n"); + 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); + + if (data->version != NFS_MOUNT_VERSION) { + printk("nfs warning: mount version %s than kernel\n", + data->version < NFS_MOUNT_VERSION ? "older" : "newer"); + if (data->version < 2) + data->namlen = 0; + if (data->version < 3) + data->bsize = 0; + if (data->version < 4) { + data->flags &= ~NFS_MOUNT_VER3; + data->root.size = NFS2_FHSIZE; + memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); + } + if (data->version < 5) + data->flags &= ~NFS_MOUNT_SECFLAVOUR; + } + + root = &server->fh; + if (data->flags & NFS_MOUNT_VER3) + root->size = data->root.size; + else + root->size = NFS2_FHSIZE; + if (root->size > sizeof(root->data)) { + printk("nfs_get_sb: invalid root filehandle\n"); + kfree(server); + return ERR_PTR(-EINVAL); + } + 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) { + printk("NFS: mount program didn't pass remote address!\n"); + kfree(server); + return ERR_PTR(-EINVAL); + } + + s = sget(fs_type, nfs_compare_super, nfs_set_super, server); + + if (IS_ERR(s) || s->s_root) { + kfree(server); + return s; + } + + s->s_flags = flags; + + /* Fire up rpciod if not yet running */ + if (rpciod_up() != 0) { + printk(KERN_WARNING "NFS: couldn't start rpciod!\n"); + kfree(server); + return ERR_PTR(-EIO); + } + + 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; +} + +static void nfs_kill_super(struct super_block *s) +{ + struct nfs_server *server = NFS_SB(s); + + kill_anon_super(s); + + if (server->client != NULL && !IS_ERR(server->client)) + rpc_shutdown_client(server->client); + if (server->client_sys != NULL && !IS_ERR(server->client_sys)) + rpc_shutdown_client(server->client_sys); + + if (!(server->flags & NFS_MOUNT_NONLM)) + lockd_down(); /* release rpc.lockd */ + + rpciod_down(); /* release rpciod */ + + if (server->hostname != NULL) + 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! */ + if (nfsi->delegation != NULL) + 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 proto, 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; + /* Initialize timeout values */ + + timeparms.to_initval = data->timeo * HZ / 10; + timeparms.to_retries = data->retrans; + timeparms.to_exponential = 1; + if (!timeparms.to_retries) + timeparms.to_retries = 5; + + proto = data->proto; + /* Which IP protocol do we use? */ + switch (proto) { + case IPPROTO_TCP: + timeparms.to_maxval = RPC_MAX_TCP_TIMEOUT; + if (!timeparms.to_initval) + timeparms.to_initval = 600 * HZ / 10; + break; + case IPPROTO_UDP: + timeparms.to_maxval = RPC_MAX_UDP_TIMEOUT; + if (!timeparms.to_initval) + timeparms.to_initval = 11 * HZ / 10; + break; + default: + return -EINVAL; + } + + clp = nfs4_get_client(&server->addr.sin_addr); + if (!clp) { + printk(KERN_WARNING "NFS: failed to create NFS4 client.\n"); + return -EIO; + } + + /* Now create transport and client */ + authflavour = RPC_AUTH_UNIX; + if (data->auth_flavourlen != 0) { + if (data->auth_flavourlen > 1) + printk(KERN_INFO "NFS: cannot yet deal with multiple auth flavours.\n"); + if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) { + err = -EFAULT; + goto out_fail; + } + } + + down_write(&clp->cl_sem); + if (clp->cl_rpcclient == NULL) { + xprt = xprt_create_proto(proto, &server->addr, &timeparms); + if (IS_ERR(xprt)) { + up_write(&clp->cl_sem); + printk(KERN_WARNING "NFS: cannot create RPC transport.\n"); + err = PTR_ERR(xprt); + 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); + printk(KERN_WARNING "NFS: cannot create RPC client.\n"); + xprt_destroy(xprt); + err = PTR_ERR(clnt); + goto out_fail; + } + clnt->cl_intr = 1; + clnt->cl_softrtry = 1; + clnt->cl_chatty = 1; + clp->cl_rpcclient = clnt; + clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0); + if (IS_ERR(clp->cl_cred)) { + up_write(&clp->cl_sem); + err = PTR_ERR(clp->cl_cred); + clp->cl_cred = NULL; + goto out_fail; + } + memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr)); + nfs_idmap_new(clp); + } + if (list_empty(&clp->cl_superblocks)) { + err = nfs4_init_client(clp); + if (err != 0) { + up_write(&clp->cl_sem); + goto out_fail; + } + } + 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)) { + printk(KERN_WARNING "NFS: cannot create RPC client.\n"); + return PTR_ERR(clnt); + } + + server->client = clnt; + + if (server->nfs4_state->cl_idmap == NULL) { + printk(KERN_WARNING "NFS: failed to create idmapper.\n"); + return -ENOMEM; + } + + if (clnt->cl_auth->au_flavor != authflavour) { + if (rpcauth_create(authflavour, clnt) == NULL) { + printk(KERN_WARNING "NFS: couldn't create credcache!\n"); + return -ENOMEM; + } + } + + 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)) { + if (p != NULL) + 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) { + printk("nfs_read_super: missing data argument\n"); + 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); + + if (data->version != NFS4_MOUNT_VERSION) { + printk("nfs warning: mount version %s than kernel\n", + data->version < NFS4_MOUNT_VERSION ? "older" : "newer"); + } + + 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) { + printk("NFS: mount program didn't pass remote IP address!\n"); + s = ERR_PTR(-EINVAL); + 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; + + /* Fire up rpciod if not yet running */ + if (rpciod_up() != 0) { + printk(KERN_WARNING "NFS: couldn't start rpciod!\n"); + s = ERR_PTR(-EIO); + goto out_free; + } + + 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: + if (server->mnt_path) + kfree(server->mnt_path); + if (server->hostname) + 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); + + if (server->hostname != NULL) + 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 = 0; + 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; + init_waitqueue_head(&nfsi->nfs_i_wait); + nfs4_init_once(nfsi); + } +} + +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; +} + +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) |