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Subject[PATCH 04/20] 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 | 1120 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 1120 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..a15790e
--- /dev/null
+++ b/fs/ceph/super.c
@@ -0,0 +1,1120 @@
+#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"
+#include "ceph_ver.h"
+#include "bookkeeper.h"
+
+/*
+ * global debug value.
+ * 0 = quiet.
+ *
+ * if the per-file debug level >= 0, then that overrides this global
+ * debug level.
+ */
+int ceph_debug __read_mostly = 1;
+int ceph_debug_mask __read_mostly = 0xffffffff;
+/* if true, send output to KERN_INFO (console) instead of KERN_DEBUG. */
+int ceph_debug_console __read_mostly;
+int ceph_debug_super __read_mostly = -1; /* for this file */
+
+#define DOUT_MASK DOUT_MASK_SUPER
+#define DOUT_VAR ceph_debug_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 = __ceph_fsid_major(&monmap->fsid) ^ __ceph_fsid_minor(&monmap->fsid);
+ 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",
+ __ceph_fsid_major(&args->fsid), __ceph_fsid_minor(&args->fsid));
+ 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) {
+ client->whoami = le32_to_cpu(msg->hdr.dst.name.num);
+ client->msgr->inst.name = msg->hdr.dst.name;
+ dout(1, "i am client%d, fsid is %llx.%llx\n", client->whoami,
+ le64_to_cpu(__ceph_fsid_major(&client->monc.monmap->fsid)),
+ le64_to_cpu(__ceph_fsid_minor(&client->monc.monmap->fsid)));
+ ceph_sysfs_client_init(client);
+ }
+}
+
+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:
+ __ceph_fsid_set_major(&args->fsid, cpu_to_le64(intval));
+ break;
+ case Opt_fsidminor:
+ __ceph_fsid_set_minor(&args->fsid, 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);
+
+ ceph_sysfs_client_cleanup(client);
+ 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;
+ 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_LSTAT,
+ NULL, NULL, path, 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_args.stat.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
+ err = ceph_mdsc_do_request(mdsc, NULL, req);
+ if (err == 0) {
+ root = req->r_dentry;
+ dget(root);
+ dout(30, "open_root_inode success, root dentry is %p\n", root);
+ } else
+ root = ERR_PTR(err);
+ 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;
+ }
+
+ 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_compare(&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:
+ ceph_mdsc_close_sessions(&client->mdsc);
+ 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,
+};
+
+static int __init init_ceph(void)
+{
+ int ret = 0;
+
+ dout(1, "init_ceph\n");
+ dout(0, "ceph (%s)\n", STRINGIFY(CEPH_GIT_VER));
+
+#ifdef CONFIG_CEPH_BOOKKEEPER
+ ceph_bookkeeper_init();
+#endif
+
+ ret = ceph_sysfs_init();
+ if (ret < 0)
+ goto out;
+
+ ret = ceph_msgr_init();
+ if (ret < 0)
+ goto out_sysfs;
+
+ 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_sysfs:
+ ceph_sysfs_cleanup();
+out:
+ return ret;
+}
+
+static void __exit exit_ceph(void)
+{
+ dout(1, "exit_ceph\n");
+ unregister_filesystem(&ceph_fs_type);
+ destroy_inodecache();
+ ceph_msgr_exit();
+ ceph_sysfs_cleanup();
+#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_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
+MODULE_DESCRIPTION("Ceph filesystem for Linux");
+MODULE_LICENSE("GPL");
--
1.5.6.5


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