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    Subject[PATCH 04/19] ceph: super.c
    Date
    Mount option parsing, client setup and teardown, and a few odds and
    ends (e.g., statfs).

    Signed-off-by: Sage Weil <sage@newdream.net>
    ---
    fs/ceph/super.c | 1165 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 1165 insertions(+), 0 deletions(-)
    create mode 100644 fs/ceph/super.c

    diff --git a/fs/ceph/super.c b/fs/ceph/super.c
    new file mode 100644
    index 0000000..235c091
    --- /dev/null
    +++ b/fs/ceph/super.c
    @@ -0,0 +1,1165 @@
    +#include <linux/module.h>
    +#include <linux/parser.h>
    +#include <linux/fs.h>
    +#include <linux/mount.h>
    +#include <linux/rwsem.h>
    +#include <linux/seq_file.h>
    +#include <linux/sched.h>
    +#include <linux/string.h>
    +#include <linux/version.h>
    +#include <linux/backing-dev.h>
    +#include <linux/statfs.h>
    +
    +/* debug levels; defined in super.h */
    +
    +#include "ceph_debug.h"
    +
    +/*
    + * global debug value.
    + * 0 = quiet.
    + *
    + * if the per-file debug level >= 0, then that overrides this global
    + * debug level.
    + */
    +int ceph_debug = 1;
    +int ceph_debug_mask = 0xffffffff;
    +/* if true, send output to KERN_INFO (console) instead of KERN_DEBUG. */
    +int ceph_debug_console;
    +int ceph_debug_super = -1; /* for this file */
    +
    +#define DOUT_MASK DOUT_MASK_SUPER
    +#define DOUT_VAR ceph_debug_super
    +#define DOUT_PREFIX "super: "
    +#include "super.h"
    +
    +#include "mon_client.h"
    +
    +void ceph_dispatch(void *p, struct ceph_msg *msg);
    +void ceph_peer_reset(void *p, struct ceph_entity_addr *peer_addr,
    + struct ceph_entity_name *peer_name);
    +
    +
    +/*
    + * super ops
    + */
    +static int ceph_write_inode(struct inode *inode, int unused)
    +{
    + struct ceph_inode_info *ci = ceph_inode(inode);
    +
    + if (memcmp(&ci->i_old_atime, &inode->i_atime, sizeof(struct timeval))) {
    + dout(30, "ceph_write_inode %llx.%llx .. atime updated\n",
    + ceph_vinop(inode));
    + /* maybe someday we will push this async to mds? */
    + }
    + return 0;
    +}
    +
    +static void ceph_put_super(struct super_block *s)
    +{
    + struct ceph_client *cl = ceph_client(s);
    + int rc;
    + int seconds = 15;
    +
    + dout(30, "put_super\n");
    + ceph_mdsc_close_sessions(&cl->mdsc);
    + ceph_monc_request_umount(&cl->monc);
    +
    + if (cl->mount_state != CEPH_MOUNT_SHUTDOWN) {
    + rc = wait_event_timeout(cl->mount_wq,
    + (cl->mount_state == CEPH_MOUNT_UNMOUNTED),
    + seconds*HZ);
    + if (rc == 0)
    + derr(0, "umount timed out after %d seconds\n", seconds);
    + }
    +
    + return;
    +}
    +
    +static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
    +{
    + struct ceph_client *client = ceph_inode_to_client(dentry->d_inode);
    + struct ceph_monmap *monmap = client->monc.monmap;
    + struct ceph_statfs st;
    + __le64 fsid;
    + int err;
    +
    + dout(30, "statfs\n");
    + err = ceph_monc_do_statfs(&client->monc, &st);
    + if (err < 0)
    + return err;
    +
    + /* fill in kstatfs */
    + buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
    +
    + /*
    + * express utilization in terms of large blocks to avoid
    + * overflow on 32-bit machines.
    + */
    + buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; /* 1 MB */
    + buf->f_blocks = le64_to_cpu(st.f_total) >> (CEPH_BLOCK_SHIFT-10);
    + buf->f_bfree = le64_to_cpu(st.f_free) >> (CEPH_BLOCK_SHIFT-10);
    + buf->f_bavail = le64_to_cpu(st.f_avail) >> (CEPH_BLOCK_SHIFT-10);
    +
    + buf->f_files = le64_to_cpu(st.f_objects);
    + buf->f_ffree = -1;
    + buf->f_namelen = PATH_MAX;
    + buf->f_frsize = PAGE_CACHE_SIZE;
    +
    + /* leave in little-endian, regardless of host endianness */
    + fsid = monmap->fsid.major ^ monmap->fsid.minor;
    + buf->f_fsid.val[0] = le64_to_cpu(fsid) & 0xffffffff;
    + buf->f_fsid.val[1] = le64_to_cpu(fsid) >> 32;
    +
    + return 0;
    +}
    +
    +
    +static int ceph_syncfs(struct super_block *sb, int wait)
    +{
    + dout(10, "sync_fs %d\n", wait);
    + return 0;
    +}
    +
    +
    +/**
    + * ceph_show_options - Show mount options in /proc/mounts
    + * @m: seq_file to write to
    + * @mnt: mount descriptor
    + */
    +static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
    +{
    + struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
    + struct ceph_mount_args *args = &client->mount_args;
    +
    + if (ceph_debug != 0)
    + seq_printf(m, ",debug=%d", ceph_debug);
    + if (args->flags & CEPH_MOUNT_FSID)
    + seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
    + args->fsid.major, args->fsid.minor);
    + if (args->flags & CEPH_MOUNT_NOSHARE)
    + seq_puts(m, ",noshare");
    + if (args->flags & CEPH_MOUNT_UNSAFE_WRITEBACK)
    + seq_puts(m, ",unsafewriteback");
    + if (args->flags & CEPH_MOUNT_DIRSTAT)
    + seq_puts(m, ",dirstat");
    + else
    + seq_puts(m, ",nodirstat");
    + if (args->flags & CEPH_MOUNT_RBYTES)
    + seq_puts(m, ",rbytes");
    + else
    + seq_puts(m, ",norbytes");
    + if (args->flags & CEPH_MOUNT_NOCRC)
    + seq_puts(m, ",nocrc");
    + return 0;
    +}
    +
    +
    +/*
    + * inode cache
    + */
    +struct kmem_cache *ceph_inode_cachep;
    +
    +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
    +static void init_once(void *foo)
    +#else
    +static void init_once(struct kmem_cache *cachep, void *foo)
    +#endif
    +{
    + struct ceph_inode_info *ci = foo;
    + inode_init_once(&ci->vfs_inode);
    +}
    +
    +static int init_inodecache(void)
    +{
    + ceph_inode_cachep = kmem_cache_create("ceph_inode_cache",
    + sizeof(struct ceph_inode_info),
    + 0, (SLAB_RECLAIM_ACCOUNT|
    + SLAB_MEM_SPREAD),
    + init_once);
    + if (ceph_inode_cachep == NULL)
    + return -ENOMEM;
    + return 0;
    +}
    +
    +static void destroy_inodecache(void)
    +{
    + kmem_cache_destroy(ceph_inode_cachep);
    +}
    +
    +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
    +static void ceph_umount_begin(struct vfsmount *vfsmnt, int flags)
    +#else
    +static void ceph_umount_begin(struct super_block *sb)
    +#endif
    +{
    +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
    + struct ceph_client *client = ceph_sb_to_client(vfsmnt->mnt_sb);
    +#else
    + struct ceph_client *client = ceph_sb_to_client(sb);
    +#endif
    +
    + dout(30, "ceph_umount_begin\n");
    +
    +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
    + if (!(flags & MNT_FORCE))
    + return;
    +#endif
    +
    + if (!client)
    + return;
    +
    + client->mount_state = CEPH_MOUNT_SHUTDOWN;
    + return;
    +}
    +
    +
    +static const struct super_operations ceph_super_ops = {
    + .alloc_inode = ceph_alloc_inode,
    + .destroy_inode = ceph_destroy_inode,
    + .write_inode = ceph_write_inode,
    + .sync_fs = ceph_syncfs,
    + .put_super = ceph_put_super,
    + .show_options = ceph_show_options,
    + .statfs = ceph_statfs,
    + .umount_begin = ceph_umount_begin,
    +};
    +
    +
    +
    +/*
    + * the monitor responds with monmap to indicate mount success.
    + * (or, someday, to indicate a change in the monitor cluster)
    + */
    +static void handle_monmap(struct ceph_client *client, struct ceph_msg *msg)
    +{
    + int err;
    + int first = (client->monc.monmap->epoch == 0);
    + struct ceph_monmap *new, *old = client->monc.monmap;
    +
    + dout(2, "handle_monmap had epoch %d\n", client->monc.monmap->epoch);
    + new = ceph_monmap_decode(msg->front.iov_base,
    + msg->front.iov_base + msg->front.iov_len);
    + if (IS_ERR(new)) {
    + err = PTR_ERR(new);
    + derr(0, "problem decoding monmap, %d\n", err);
    + return;
    + }
    + client->monc.monmap = new;
    + kfree(old);
    +
    + if (first) {
    + char name[10];
    + client->whoami = le32_to_cpu(msg->hdr.dst.name.num);
    + client->msgr->inst.name = msg->hdr.dst.name;
    + sprintf(name, "client%d", client->whoami);
    + dout(1, "i am %s, fsid is %llx.%llx\n", name,
    + le64_to_cpu(client->monc.monmap->fsid.major),
    + le64_to_cpu(client->monc.monmap->fsid.minor));
    +
    +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25)
    + client->client_kobj = kobject_create_and_add(name, ceph_kobj);
    + /*
    + client->fsid_kobj = kobject_create_and_add("fsid",
    + client->client_kobj);
    + */
    +#endif
    + }
    +}
    +
    +const char *ceph_msg_type_name(int type)
    +{
    + switch (type) {
    + case CEPH_MSG_SHUTDOWN: return "shutdown";
    + case CEPH_MSG_PING: return "ping";
    + case CEPH_MSG_MON_MAP: return "mon_map";
    + case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
    + case CEPH_MSG_CLIENT_MOUNT: return "client_mount";
    + case CEPH_MSG_CLIENT_UNMOUNT: return "client_unmount";
    + case CEPH_MSG_STATFS: return "statfs";
    + case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
    + case CEPH_MSG_MDS_GETMAP: return "mds_getmap";
    + case CEPH_MSG_MDS_MAP: return "mds_map";
    + case CEPH_MSG_CLIENT_SESSION: return "client_session";
    + case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
    + case CEPH_MSG_CLIENT_REQUEST: return "client_request";
    + case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
    + case CEPH_MSG_CLIENT_REPLY: return "client_reply";
    + case CEPH_MSG_CLIENT_CAPS: return "client_caps";
    + case CEPH_MSG_CLIENT_SNAP: return "client_snap";
    + case CEPH_MSG_CLIENT_LEASE: return "client_lease";
    + case CEPH_MSG_OSD_GETMAP: return "osd_getmap";
    + case CEPH_MSG_OSD_MAP: return "osd_map";
    + case CEPH_MSG_OSD_OP: return "osd_op";
    + case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
    + default: return "unknown";
    + }
    +}
    +
    +/*
    + * Called when a message socket is explicitly reset by a peer.
    + */
    +void ceph_peer_reset(void *p, struct ceph_entity_addr *peer_addr,
    + struct ceph_entity_name *peer_name)
    +{
    + struct ceph_client *client = p;
    +
    + dout(30, "ceph_peer_reset %s%d\n", ENTITY_NAME(*peer_name));
    + switch (le32_to_cpu(peer_name->type)) {
    + case CEPH_ENTITY_TYPE_MDS:
    + ceph_mdsc_handle_reset(&client->mdsc,
    + le32_to_cpu(peer_name->num));
    + break;
    + case CEPH_ENTITY_TYPE_OSD:
    + ceph_osdc_handle_reset(&client->osdc, peer_addr);
    + break;
    + }
    +}
    +
    +
    +/*
    + * mount options
    + */
    +enum {
    + Opt_fsidmajor,
    + Opt_fsidminor,
    + Opt_debug,
    + Opt_debug_console,
    + Opt_debug_msgr,
    + Opt_debug_mdsc,
    + Opt_debug_osdc,
    + Opt_debug_addr,
    + Opt_debug_inode,
    + Opt_debug_snap,
    + Opt_debug_ioctl,
    + Opt_debug_caps,
    + Opt_monport,
    + Opt_port,
    + Opt_wsize,
    + Opt_rsize,
    + Opt_osdtimeout,
    + Opt_mount_timeout,
    + /* int args above */
    + Opt_ip,
    + Opt_noshare,
    + Opt_unsafewriteback,
    + Opt_safewriteback,
    + Opt_dirstat,
    + Opt_nodirstat,
    + Opt_rbytes,
    + Opt_norbytes,
    + Opt_nocrc,
    +};
    +
    +static match_table_t arg_tokens = {
    + {Opt_fsidmajor, "fsidmajor=%ld"},
    + {Opt_fsidminor, "fsidminor=%ld"},
    + {Opt_debug, "debug=%d"},
    + {Opt_debug_msgr, "debug_msgr=%d"},
    + {Opt_debug_mdsc, "debug_mdsc=%d"},
    + {Opt_debug_osdc, "debug_osdc=%d"},
    + {Opt_debug_addr, "debug_addr=%d"},
    + {Opt_debug_inode, "debug_inode=%d"},
    + {Opt_debug_snap, "debug_snap=%d"},
    + {Opt_debug_ioctl, "debug_ioctl=%d"},
    + {Opt_debug_caps, "debug_caps=%d"},
    + {Opt_monport, "monport=%d"},
    + {Opt_port, "port=%d"},
    + {Opt_wsize, "wsize=%d"},
    + {Opt_rsize, "rsize=%d"},
    + {Opt_osdtimeout, "osdtimeout=%d"},
    + {Opt_mount_timeout, "mount_timeout=%d"},
    + /* int args above */
    + {Opt_ip, "ip=%s"},
    + {Opt_debug_console, "debug_console"},
    + {Opt_noshare, "noshare"},
    + {Opt_unsafewriteback, "unsafewriteback"},
    + {Opt_safewriteback, "safewriteback"},
    + {Opt_dirstat, "dirstat"},
    + {Opt_nodirstat, "nodirstat"},
    + {Opt_rbytes, "rbytes"},
    + {Opt_norbytes, "norbytes"},
    + {Opt_nocrc, "nocrc"},
    + {-1, NULL}
    +};
    +
    +#define ADDR_DELIM(c) ((!c) || (c == ':') || (c == ','))
    +
    +/*
    + * FIXME: add error checking to ip parsing
    + */
    +static int parse_ip(const char *c, int len, struct ceph_entity_addr *addr,
    + int max_count, int *count)
    +{
    + int i;
    + int v;
    + int mon_count;
    + unsigned ip = 0;
    + const char *p = c, *numstart;
    +
    + dout(15, "parse_ip on '%s' len %d\n", c, len);
    + for (mon_count = 0; mon_count < max_count; mon_count++) {
    + for (i = 0; !ADDR_DELIM(*p) && i < 4; i++) {
    + v = 0;
    + numstart = p;
    + while (!ADDR_DELIM(*p) && *p != '.' && p < c+len) {
    + if (*p < '0' || *p > '9')
    + goto bad;
    + v = (v * 10) + (*p - '0');
    + p++;
    + }
    + if (v > 255 || numstart == p)
    + goto bad;
    + ip = (ip << 8) + v;
    +
    + if (*p == '.')
    + p++;
    + }
    + if (i != 4)
    + goto bad;
    + *(__be32 *)&addr[mon_count].ipaddr.sin_addr.s_addr = htonl(ip);
    +
    + /* port? */
    + if (*p == ':') {
    + p++;
    + numstart = p;
    + v = 0;
    + while (!ADDR_DELIM(*p) && *p != '.' && p < c+len) {
    + if (*p < '0' || *p > '9')
    + goto bad;
    + v = (v * 10) + (*p - '0');
    + p++;
    + }
    + if (v > 65535 || numstart == p)
    + goto bad;
    + addr[mon_count].ipaddr.sin_port = htons(v);
    + } else
    + addr[mon_count].ipaddr.sin_port = htons(CEPH_MON_PORT);
    +
    + dout(15, "parse_ip got %u.%u.%u.%u:%u\n",
    + IPQUADPORT(addr[mon_count].ipaddr));
    +
    + if (*p != ',')
    + break;
    + p++;
    + }
    +
    + if (p < c+len)
    + goto bad;
    +
    + if (count)
    + *count = mon_count + 1;
    +
    + return 0;
    +
    +bad:
    + derr(1, "parse_ip bad ip '%s'\n", c);
    + return -EINVAL;
    +}
    +
    +static int parse_mount_args(int flags, char *options, const char *dev_name,
    + struct ceph_mount_args *args, const char **path)
    +{
    + char *c;
    + int len, err;
    + substring_t argstr[MAX_OPT_ARGS];
    + int i;
    +
    + dout(15, "parse_mount_args dev_name '%s'\n", dev_name);
    + memset(args, 0, sizeof(*args));
    +
    + /* defaults */
    + args->sb_flags = flags;
    + args->flags = CEPH_MOUNT_DEFAULT;
    + args->osd_timeout = 5; /* seconds */
    + args->mount_timeout = 30; /* seconds */
    + args->snapdir_name = ".snap";
    +
    + /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
    + c = strstr(dev_name, ":/");
    + if (c == NULL)
    + return -EINVAL;
    + *c = 0;
    +
    + /* get mon ip(s) */
    + len = c - dev_name;
    + err = parse_ip(dev_name, len, args->mon_addr, MAX_MON_MOUNT_ADDR,
    + &args->num_mon);
    + if (err < 0)
    + return err;
    +
    + for (i = 0; i < args->num_mon; i++) {
    + args->mon_addr[i].ipaddr.sin_family = AF_INET;
    + args->mon_addr[i].erank = 0;
    + args->mon_addr[i].nonce = 0;
    + }
    + args->my_addr.ipaddr.sin_family = AF_INET;
    + args->my_addr.ipaddr.sin_addr.s_addr = htonl(0);
    + args->my_addr.ipaddr.sin_port = htons(0);
    +
    + /* path on server */
    + c++;
    + while (*c == '/')
    + c++; /* remove leading '/'(s) */
    + *path = c;
    + dout(15, "server path '%s'\n", *path);
    +
    + /* parse mount options */
    + while ((c = strsep(&options, ",")) != NULL) {
    + int token, intval, ret;
    + if (!*c)
    + continue;
    + token = match_token(c, arg_tokens, argstr);
    + if (token < 0) {
    + derr(0, "bad mount option at '%s'\n", c);
    + return -EINVAL;
    +
    + }
    + if (token < Opt_ip) {
    + ret = match_int(&argstr[0], &intval);
    + if (ret < 0) {
    + dout(0, "bad mount arg, not int\n");
    + continue;
    + }
    + dout(30, "got token %d intval %d\n", token, intval);
    + }
    + switch (token) {
    + case Opt_fsidmajor:
    + args->fsid.major = cpu_to_le64(intval);
    + break;
    + case Opt_fsidminor:
    + args->fsid.minor = cpu_to_le64(intval);
    + break;
    + case Opt_port:
    + args->my_addr.ipaddr.sin_port = htons(intval);
    + break;
    + case Opt_ip:
    + err = parse_ip(argstr[0].from,
    + argstr[0].to-argstr[0].from,
    + &args->my_addr,
    + 1, NULL);
    + if (err < 0)
    + return err;
    + args->flags |= CEPH_MOUNT_MYIP;
    + break;
    +
    + /* debug levels */
    + case Opt_debug:
    + ceph_debug = intval;
    + break;
    + case Opt_debug_msgr:
    + ceph_debug_msgr = intval;
    + break;
    + case Opt_debug_mdsc:
    + ceph_debug_mdsc = intval;
    + break;
    + case Opt_debug_osdc:
    + ceph_debug_osdc = intval;
    + break;
    + case Opt_debug_addr:
    + ceph_debug_addr = intval;
    + break;
    + case Opt_debug_inode:
    + ceph_debug_inode = intval;
    + break;
    + case Opt_debug_snap:
    + ceph_debug_snap = intval;
    + break;
    + case Opt_debug_ioctl:
    + ceph_debug_ioctl = intval;
    + break;
    + case Opt_debug_caps:
    + ceph_debug_caps = intval;
    + break;
    + case Opt_debug_console:
    + ceph_debug_console = 1;
    + break;
    +
    + /* misc */
    + case Opt_wsize:
    + args->wsize = intval;
    + break;
    + case Opt_rsize:
    + args->rsize = intval;
    + break;
    + case Opt_osdtimeout:
    + args->osd_timeout = intval;
    + break;
    + case Opt_mount_timeout:
    + args->mount_timeout = intval;
    + break;
    +
    + case Opt_noshare:
    + args->flags |= CEPH_MOUNT_NOSHARE;
    + break;
    + case Opt_unsafewriteback:
    + args->flags |= CEPH_MOUNT_UNSAFE_WRITEBACK;
    + break;
    + case Opt_safewriteback:
    + args->flags &= ~CEPH_MOUNT_UNSAFE_WRITEBACK;
    + break;
    +
    + case Opt_dirstat:
    + args->flags |= CEPH_MOUNT_DIRSTAT;
    + break;
    + case Opt_nodirstat:
    + args->flags &= ~CEPH_MOUNT_DIRSTAT;
    + break;
    + case Opt_rbytes:
    + args->flags |= CEPH_MOUNT_RBYTES;
    + break;
    + case Opt_norbytes:
    + args->flags &= ~CEPH_MOUNT_RBYTES;
    + break;
    + case Opt_nocrc:
    + args->flags |= CEPH_MOUNT_NOCRC;
    + break;
    +
    + default:
    + BUG_ON(token);
    + }
    + }
    +
    + return 0;
    +}
    +
    +/*
    + * create a fresh client instance
    + */
    +static struct ceph_client *ceph_create_client(void)
    +{
    + struct ceph_client *client;
    + int err = -ENOMEM;
    +
    + client = kzalloc(sizeof(*client), GFP_KERNEL);
    + if (client == NULL)
    + return ERR_PTR(-ENOMEM);
    +
    + mutex_init(&client->mount_mutex);
    +
    + init_waitqueue_head(&client->mount_wq);
    +
    + client->sb = NULL;
    + client->mount_state = CEPH_MOUNT_MOUNTING;
    + client->whoami = -1;
    +
    + client->msgr = NULL;
    +
    + client->wb_wq = create_workqueue("ceph-writeback");
    + if (client->wb_wq == NULL)
    + goto fail;
    + client->pg_inv_wq = create_workqueue("ceph-pg-invalid");
    + if (client->pg_inv_wq == NULL)
    + goto fail;
    + client->trunc_wq = create_workqueue("ceph-trunc");
    + if (client->trunc_wq == NULL)
    + goto fail;
    +
    + /* subsystems */
    + err = ceph_monc_init(&client->monc, client);
    + if (err < 0)
    + return ERR_PTR(err);
    + ceph_mdsc_init(&client->mdsc, client);
    + ceph_osdc_init(&client->osdc, client);
    +
    + return client;
    +
    +fail:
    + return ERR_PTR(-ENOMEM);
    +}
    +
    +static void ceph_destroy_client(struct ceph_client *client)
    +{
    + dout(10, "destroy_client %p\n", client);
    +
    + /* unmount */
    + ceph_mdsc_stop(&client->mdsc);
    + ceph_monc_stop(&client->monc);
    + ceph_osdc_stop(&client->osdc);
    +
    +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25)
    + if (client->client_kobj)
    + kobject_put(client->client_kobj);
    +#endif
    + if (client->wb_wq)
    + destroy_workqueue(client->wb_wq);
    + if (client->pg_inv_wq)
    + destroy_workqueue(client->pg_inv_wq);
    + if (client->trunc_wq)
    + destroy_workqueue(client->trunc_wq);
    + if (client->msgr)
    + ceph_messenger_destroy(client->msgr);
    + kfree(client);
    + dout(10, "destroy_client %p done\n", client);
    +}
    +
    +/*
    + * true if we have the mon, osd, and mds maps, and are thus
    + * fully "mounted".
    + */
    +static int have_all_maps(struct ceph_client *client)
    +{
    + return client->osdc.osdmap && client->osdc.osdmap->epoch &&
    + client->monc.monmap && client->monc.monmap->epoch &&
    + client->mdsc.mdsmap && client->mdsc.mdsmap->m_epoch;
    +}
    +
    +/*
    + * Bootstrap mount by opening the root directory. Note the mount
    + * @started time from caller, and time out if this takes too long.
    + */
    +static struct dentry *open_root_dentry(struct ceph_client *client,
    + const char *path,
    + unsigned long started)
    +{
    + struct ceph_mds_client *mdsc = &client->mdsc;
    + struct ceph_mds_request *req = NULL;
    + struct ceph_mds_request_head *reqhead;
    + int err;
    + struct dentry *root;
    +
    + /* open dir */
    + dout(30, "open_root_inode opening '%s'\n", path);
    + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_OPEN,
    + 1, path, 0, NULL,
    + NULL, USE_ANY_MDS);
    + if (IS_ERR(req))
    + return ERR_PTR(PTR_ERR(req));
    + req->r_started = started;
    + req->r_timeout = client->mount_args.mount_timeout * HZ;
    + req->r_expected_cap = kmalloc(sizeof(struct ceph_cap), GFP_NOFS);
    + if (!req->r_expected_cap) {
    + root = ERR_PTR(-ENOMEM);
    + goto out;
    + }
    + reqhead = req->r_request->front.iov_base;
    + reqhead->args.open.flags = cpu_to_le32(O_DIRECTORY);
    + reqhead->args.open.mode = 0;
    + err = ceph_mdsc_do_request(mdsc, req);
    + if (err == 0) {
    + root = req->r_last_dentry;
    + dget(root);
    + dout(30, "open_root_inode success, root dentry is %p\n", root);
    + } else
    + root = ERR_PTR(err);
    +out:
    + ceph_mdsc_put_request(req);
    + return root;
    +}
    +
    +/*
    + * mount: join the ceph cluster.
    + */
    +static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
    + const char *path)
    +{
    + struct ceph_entity_addr *myaddr = NULL;
    + struct ceph_msg *mount_msg;
    + struct dentry *root;
    + int err;
    + int request_interval = 5 * HZ;
    + unsigned long timeout = client->mount_args.mount_timeout * HZ;
    + unsigned long started = jiffies; /* note the start time */
    + int which;
    + unsigned char r;
    +
    + dout(10, "mount start\n");
    + mutex_lock(&client->mount_mutex);
    +
    + /* initialize the messenger */
    + if (client->msgr == NULL) {
    + if (client->mount_args.flags & CEPH_MOUNT_MYIP)
    + myaddr = &client->mount_args.my_addr;
    + client->msgr = ceph_messenger_create(myaddr);
    + if (IS_ERR(client->msgr)) {
    + err = PTR_ERR(client->msgr);
    + client->msgr = NULL;
    + goto out;
    + }
    + client->msgr->parent = client;
    + client->msgr->dispatch = ceph_dispatch;
    + client->msgr->prepare_pages = ceph_osdc_prepare_pages;
    + client->msgr->peer_reset = ceph_peer_reset;
    + }
    +
    + /* send mount request, and wait for mon, mds, and osd maps */
    + while (!have_all_maps(client)) {
    + err = -EIO;
    + if (timeout && time_after_eq(jiffies, started + timeout))
    + goto out;
    + dout(10, "mount sending mount request\n");
    + get_random_bytes(&r, 1);
    + which = r % client->mount_args.num_mon;
    + mount_msg = ceph_msg_new(CEPH_MSG_CLIENT_MOUNT, 0, 0, 0, NULL);
    + if (IS_ERR(mount_msg)) {
    + err = PTR_ERR(mount_msg);
    + goto out;
    + }
    + mount_msg->hdr.dst.name.type =
    + cpu_to_le32(CEPH_ENTITY_TYPE_MON);
    + mount_msg->hdr.dst.name.num = cpu_to_le32(which);
    + mount_msg->hdr.dst.addr = client->mount_args.mon_addr[which];
    +
    + ceph_msg_send(client->msgr, mount_msg, 0);
    +
    + /* wait */
    + dout(10, "mount sent to mon%d, waiting for maps\n", which);
    + err = wait_event_interruptible_timeout(client->mount_wq,
    + have_all_maps(client),
    + request_interval);
    + if (err == -EINTR)
    + goto out;
    + }
    +
    + dout(30, "mount opening base mountpoint\n");
    + root = open_root_dentry(client, path, started);
    + if (IS_ERR(root)) {
    + err = PTR_ERR(root);
    + goto out;
    + }
    +
    + /*
    + * Drop the reference we just got, since the VFS doesn't give
    + * us a reliable way to drop it later when a particular
    + * vfsmount goes away. If the directory we just mounted on is
    + * renamed on the server, we are screwed.
    + */
    + ceph_put_fmode(ceph_inode(root->d_inode), CEPH_FILE_MODE_PIN);
    +
    + mnt->mnt_root = root;
    + mnt->mnt_sb = client->sb;
    + client->mount_state = CEPH_MOUNT_MOUNTED;
    + dout(10, "mount success\n");
    + err = 0;
    +
    +out:
    + mutex_unlock(&client->mount_mutex);
    + return err;
    +}
    +
    +
    +/*
    + * Process an incoming message.
    + *
    + * This should be relatively fast and must not do any work that waits
    + * on other messages to be received.
    + */
    +void ceph_dispatch(void *p, struct ceph_msg *msg)
    +{
    + struct ceph_client *client = p;
    + int had;
    + int type = le16_to_cpu(msg->hdr.type);
    +
    + switch (type) {
    + case CEPH_MSG_MON_MAP:
    + had = client->monc.monmap->epoch ? 1 : 0;
    + handle_monmap(client, msg);
    + if (!had && client->monc.monmap->epoch && have_all_maps(client))
    + wake_up(&client->mount_wq);
    + break;
    +
    + /* mon client */
    + case CEPH_MSG_STATFS_REPLY:
    + ceph_monc_handle_statfs_reply(&client->monc, msg);
    + break;
    + case CEPH_MSG_CLIENT_UNMOUNT:
    + ceph_monc_handle_umount(&client->monc, msg);
    + break;
    +
    + /* mds client */
    + case CEPH_MSG_MDS_MAP:
    + had = client->mdsc.mdsmap ? 1 : 0;
    + ceph_mdsc_handle_map(&client->mdsc, msg);
    + if (!had && client->mdsc.mdsmap && have_all_maps(client))
    + wake_up(&client->mount_wq);
    + break;
    + case CEPH_MSG_CLIENT_SESSION:
    + ceph_mdsc_handle_session(&client->mdsc, msg);
    + break;
    + case CEPH_MSG_CLIENT_REPLY:
    + ceph_mdsc_handle_reply(&client->mdsc, msg);
    + break;
    + case CEPH_MSG_CLIENT_REQUEST_FORWARD:
    + ceph_mdsc_handle_forward(&client->mdsc, msg);
    + break;
    + case CEPH_MSG_CLIENT_CAPS:
    + ceph_handle_caps(&client->mdsc, msg);
    + break;
    + case CEPH_MSG_CLIENT_SNAP:
    + ceph_handle_snap(&client->mdsc, msg);
    + break;
    + case CEPH_MSG_CLIENT_LEASE:
    + ceph_mdsc_handle_lease(&client->mdsc, msg);
    + break;
    +
    + /* osd client */
    + case CEPH_MSG_OSD_MAP:
    + had = client->osdc.osdmap ? 1 : 0;
    + ceph_osdc_handle_map(&client->osdc, msg);
    + if (!had && client->osdc.osdmap && have_all_maps(client))
    + wake_up(&client->mount_wq);
    + break;
    + case CEPH_MSG_OSD_OPREPLY:
    + ceph_osdc_handle_reply(&client->osdc, msg);
    + break;
    +
    + default:
    + derr(0, "received unknown message type %d %s\n", type,
    + ceph_msg_type_name(type));
    + }
    +
    + ceph_msg_put(msg);
    +}
    +
    +
    +static int ceph_set_super(struct super_block *s, void *data)
    +{
    + struct ceph_client *client = data;
    + int ret;
    +
    + dout(10, "set_super %p data %p\n", s, data);
    +
    + s->s_flags = client->mount_args.sb_flags;
    + s->s_maxbytes = min((u64)MAX_LFS_FILESIZE, CEPH_FILE_MAX_SIZE);
    +
    + s->s_fs_info = client;
    + client->sb = s;
    +
    + s->s_op = &ceph_super_ops;
    + s->s_export_op = &ceph_export_ops;
    +
    + s->s_time_gran = 1000; /* 1000 ns == 1 us */
    +
    + ret = set_anon_super(s, NULL); /* what is that second arg for? */
    + if (ret != 0)
    + goto fail;
    +
    + return ret;
    +
    +fail:
    + s->s_fs_info = NULL;
    + client->sb = NULL;
    + return ret;
    +}
    +
    +/*
    + * share superblock if same fs AND options
    + */
    +static int ceph_compare_super(struct super_block *sb, void *data)
    +{
    + struct ceph_client *new = data;
    + struct ceph_mount_args *args = &new->mount_args;
    + struct ceph_client *other = ceph_sb_to_client(sb);
    + int i;
    + dout(10, "ceph_compare_super %p\n", sb);
    +
    + /* either compare fsid, or specified mon_hostname */
    + if (args->flags & CEPH_MOUNT_FSID) {
    + if (!ceph_fsid_equal(&args->fsid, &other->fsid)) {
    + dout(30, "fsid doesn't match\n");
    + return 0;
    + }
    + } else {
    + /* do we share (a) monitor? */
    + for (i = 0; i < args->num_mon; i++)
    + if (ceph_monmap_contains(other->monc.monmap,
    + &args->mon_addr[i]))
    + break;
    + if (i == args->num_mon) {
    + dout(30, "mon ip not part of monmap\n");
    + return 0;
    + }
    + dout(10, "mon ip matches existing sb %p\n", sb);
    + }
    + if (args->sb_flags != other->mount_args.sb_flags) {
    + dout(30, "flags differ\n");
    + return 0;
    + }
    + return 1;
    +}
    +
    +/*
    + * construct our own bdi so we can control readahead
    + */
    +static int ceph_init_bdi(struct super_block *sb, struct ceph_client *client)
    +{
    + int err;
    +
    + if (client->mount_args.rsize)
    + client->backing_dev_info.ra_pages =
    + (client->mount_args.rsize + PAGE_CACHE_SIZE - 1)
    + >> PAGE_SHIFT;
    +
    + if (client->backing_dev_info.ra_pages < (PAGE_CACHE_SIZE >> PAGE_SHIFT))
    + client->backing_dev_info.ra_pages =
    + CEPH_DEFAULT_READ_SIZE >> PAGE_SHIFT;
    +
    + err = bdi_init(&client->backing_dev_info);
    +
    +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 26)
    + if (err < 0)
    + return err;
    +
    + err = bdi_register_dev(&client->backing_dev_info, sb->s_dev);
    +#endif
    +
    + return err;
    +}
    +
    +static int ceph_get_sb(struct file_system_type *fs_type,
    + int flags, const char *dev_name, void *data,
    + struct vfsmount *mnt)
    +{
    + struct super_block *sb;
    + struct ceph_client *client;
    + int err;
    + int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
    + const char *path;
    +
    + dout(25, "ceph_get_sb\n");
    +
    + /* create client (which we may/may not use) */
    + client = ceph_create_client();
    + if (IS_ERR(client))
    + return PTR_ERR(client);
    +
    + err = parse_mount_args(flags, data, dev_name,
    + &client->mount_args, &path);
    + if (err < 0)
    + goto out;
    +
    + if (client->mount_args.flags & CEPH_MOUNT_NOSHARE)
    + compare_super = NULL;
    +
    + sb = sget(fs_type, compare_super, ceph_set_super, client);
    + if (IS_ERR(sb)) {
    + err = PTR_ERR(sb);
    + goto out;
    + }
    +
    + if (ceph_client(sb) != client) {
    + ceph_destroy_client(client);
    + client = ceph_client(sb);
    + dout(20, "get_sb got existing client %p\n", client);
    + } else {
    + dout(20, "get_sb using new client %p\n", client);
    +
    + err = ceph_init_bdi(sb, client);
    + if (err < 0)
    + goto out_splat;
    + }
    +
    + err = ceph_mount(client, mnt, path);
    + if (err < 0)
    + goto out_splat;
    + dout(22, "root ino %llx.%llx\n", ceph_vinop(mnt->mnt_root->d_inode));
    + return 0;
    +
    +out_splat:
    + up_write(&sb->s_umount);
    + deactivate_super(sb);
    + goto out_final;
    +out:
    + ceph_destroy_client(client);
    +out_final:
    + dout(25, "ceph_get_sb fail %d\n", err);
    + return err;
    +}
    +
    +static void ceph_kill_sb(struct super_block *s)
    +{
    + struct ceph_client *client = ceph_sb_to_client(s);
    + dout(1, "kill_sb %p\n", s);
    + ceph_mdsc_pre_umount(&client->mdsc);
    +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 26)
    + bdi_unregister(&client->backing_dev_info);
    +#endif
    + kill_anon_super(s); /* will call put_super after sb is r/o */
    + bdi_destroy(&client->backing_dev_info);
    + ceph_destroy_client(client);
    +}
    +
    +
    +/************************************/
    +
    +static struct file_system_type ceph_fs_type = {
    + .owner = THIS_MODULE,
    + .name = "ceph",
    + .get_sb = ceph_get_sb,
    + .kill_sb = ceph_kill_sb,
    + .fs_flags = FS_RENAME_DOES_D_MOVE,
    +};
    +
    +struct kobject *ceph_kobj;
    +
    +static int __init init_ceph(void)
    +{
    + int ret = 0;
    +
    + dout(1, "init_ceph\n");
    +
    +#ifdef CONFIG_CEPH_BOOKKEEPER
    + ceph_bookkeeper_init();
    +#endif
    +
    +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25)
    + ret = -ENOMEM;
    + ceph_kobj = kobject_create_and_add("ceph", fs_kobj);
    + if (!ceph_kobj)
    + goto out;
    +#endif
    +
    + ret = ceph_proc_init();
    + if (ret < 0)
    + goto out_kobj;
    +
    + ret = ceph_msgr_init();
    + if (ret < 0)
    + goto out_proc;
    +
    + ret = init_inodecache();
    + if (ret)
    + goto out_msgr;
    +
    + ret = register_filesystem(&ceph_fs_type);
    + if (ret)
    + goto out_icache;
    + return 0;
    +
    +out_icache:
    + destroy_inodecache();
    +out_msgr:
    + ceph_msgr_exit();
    +out_proc:
    + ceph_proc_cleanup();
    +out_kobj:
    +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25)
    + kobject_put(ceph_kobj);
    + ceph_kobj = NULL;
    +out:
    +#endif
    + return ret;
    +}
    +
    +static void __exit exit_ceph(void)
    +{
    + dout(1, "exit_ceph\n");
    + unregister_filesystem(&ceph_fs_type);
    + destroy_inodecache();
    + ceph_msgr_exit();
    + ceph_proc_cleanup();
    +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25)
    + kobject_put(ceph_kobj);
    + ceph_kobj = NULL;
    +#endif
    +#ifdef CONFIG_CEPH_BOOKKEEPER
    + ceph_bookkeeper_finalize();
    +#endif
    +}
    +
    +module_init(init_ceph);
    +module_exit(exit_ceph);
    +
    +MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
    +MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
    +MODULE_DESCRIPTION("Ceph filesystem for Linux");
    +MODULE_LICENSE("GPL");
    --
    1.5.6.5


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      Last update: 2008-11-14 02:29    [W:0.080 / U:62.324 seconds]
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