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Subject[PATCH 05/20] 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 | 1035 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 1035 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..386ea28
--- /dev/null
+++ b/fs/ceph/super.c
@@ -0,0 +1,1035 @@
+#include <linux/backing-dev.h>
+#include <linux/fs.h>
+#include <linux/inet.h>
+#include <linux/module.h>
+#include <linux/mount.h>
+#include <linux/parser.h>
+#include <linux/rwsem.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/statfs.h>
+#include <linux/string.h>
+#include <linux/version.h>
+#include <linux/vmalloc.h>
+
+#include "ceph_debug.h"
+#include "ceph_ver.h"
+#include "decode.h"
+#include "super.h"
+#include "mon_client.h"
+
+/*
+ * Ceph superblock operations
+ *
+ * Handle the basics of mounting, unmounting.
+ */
+
+
+/*
+ * find filename portion of a path (/foo/bar/baz -> baz)
+ */
+const char *ceph_file_part(const char *s, int len)
+{
+ const char *e = s + len;
+
+ while (e != s && *(e-1) != '/')
+ e--;
+ return e;
+}
+
+
+/*
+ * super ops
+ */
+static void ceph_put_super(struct super_block *s)
+{
+ struct ceph_client *cl = ceph_client(s);
+
+ dout("put_super\n");
+ ceph_mdsc_close_sessions(&cl->mdsc);
+ 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("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;
+ buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
+ buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
+ (CEPH_BLOCK_SHIFT-10);
+ buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
+
+ buf->f_files = le64_to_cpu(st.num_objects);
+ buf->f_ffree = -1;
+ buf->f_namelen = PATH_MAX;
+ buf->f_frsize = PAGE_CACHE_SIZE;
+
+ /* leave fsid 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("sync_fs %d\n", wait);
+ ceph_osdc_sync(&ceph_client(sb)->osdc);
+ ceph_mdsc_sync(&ceph_client(sb)->mdsc);
+ 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 (args->flags & CEPH_OPT_FSID)
+ seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
+ __ceph_fsid_major(&args->fsid),
+ __ceph_fsid_minor(&args->fsid));
+ if (args->flags & CEPH_OPT_NOSHARE)
+ seq_puts(m, ",noshare");
+ if (args->flags & CEPH_OPT_DIRSTAT)
+ seq_puts(m, ",dirstat");
+ if ((args->flags & CEPH_OPT_RBYTES) == 0)
+ seq_puts(m, ",norbytes");
+ if (args->flags & CEPH_OPT_NOCRC)
+ seq_puts(m, ",nocrc");
+ if (args->flags & CEPH_OPT_NOASYNCREADDIR)
+ seq_puts(m, ",noasyncreaddir");
+ if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
+ seq_printf(m, ",snapdirname=%s", args->snapdir_name);
+ if (args->secret)
+ seq_puts(m, ",secret=<hidden>");
+ return 0;
+}
+
+/*
+ * caches
+ */
+struct kmem_cache *ceph_inode_cachep;
+struct kmem_cache *ceph_cap_cachep;
+struct kmem_cache *ceph_dentry_cachep;
+struct kmem_cache *ceph_file_cachep;
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
+static void ceph_inode_init_once(void *foo)
+#else
+static void ceph_inode_init_once(struct kmem_cache *cachep, void *foo)
+#endif
+{
+ struct ceph_inode_info *ci = foo;
+ inode_init_once(&ci->vfs_inode);
+}
+
+static int init_caches(void)
+{
+ ceph_inode_cachep = kmem_cache_create("ceph_inode_cache",
+ sizeof(struct ceph_inode_info),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ ceph_inode_init_once);
+ if (ceph_inode_cachep == NULL)
+ return -ENOMEM;
+
+ ceph_cap_cachep = kmem_cache_create("ceph_caps_cache",
+ sizeof(struct ceph_cap),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ NULL);
+ if (ceph_cap_cachep == NULL)
+ goto bad_cap;
+
+ ceph_dentry_cachep = kmem_cache_create("ceph_dentry_cache",
+ sizeof(struct ceph_dentry_info),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ NULL);
+ if (ceph_dentry_cachep == NULL)
+ goto bad_dentry;
+
+ ceph_file_cachep = kmem_cache_create("ceph_file_cache",
+ sizeof(struct ceph_file_info),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ NULL);
+ if (ceph_file_cachep == NULL)
+ goto bad_file;
+
+ return 0;
+
+bad_file:
+ kmem_cache_destroy(ceph_dentry_cachep);
+bad_dentry:
+ kmem_cache_destroy(ceph_cap_cachep);
+bad_cap:
+ kmem_cache_destroy(ceph_inode_cachep);
+ return -ENOMEM;
+}
+
+static void destroy_caches(void)
+{
+ kmem_cache_destroy(ceph_inode_cachep);
+ kmem_cache_destroy(ceph_cap_cachep);
+ kmem_cache_destroy(ceph_dentry_cachep);
+ kmem_cache_destroy(ceph_file_cachep);
+}
+
+
+/*
+ * ceph_umount_begin - initiate forced umount. Tear down down the
+ * mount, skipping steps that may hang while waiting for server(s).
+ */
+#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("ceph_umount_begin - starting forced umount\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,
+};
+
+
+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_MON_SUBSCRIBE: return "mon_subscribe";
+ case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
+ case CEPH_MSG_CLIENT_MOUNT: return "client_mount";
+ case CEPH_MSG_CLIENT_MOUNT_ACK: return "client_mount_ack";
+ 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_CAPRELEASE: return "client_cap_release";
+ 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";
+ }
+}
+
+
+/*
+ * mount options
+ */
+enum {
+ Opt_fsidmajor,
+ Opt_fsidminor,
+ Opt_monport,
+ Opt_port,
+ Opt_wsize,
+ Opt_rsize,
+ Opt_osdtimeout,
+ Opt_mount_timeout,
+ Opt_caps_wanted_delay_min,
+ Opt_caps_wanted_delay_max,
+ Opt_readdir_max_entries,
+ /* int args above */
+ Opt_snapdirname,
+ Opt_secret,
+ /* string args above */
+ Opt_ip,
+ Opt_noshare,
+ Opt_dirstat,
+ Opt_nodirstat,
+ Opt_rbytes,
+ Opt_norbytes,
+ Opt_nocrc,
+ Opt_noasyncreaddir,
+};
+
+static match_table_t arg_tokens = {
+ {Opt_fsidmajor, "fsidmajor=%ld"},
+ {Opt_fsidminor, "fsidminor=%ld"},
+ {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"},
+ {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
+ {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
+ {Opt_readdir_max_entries, "readdir_max_entries=%d"},
+ /* int args above */
+ {Opt_snapdirname, "snapdirname=%s"},
+ {Opt_secret, "secret=%s"},
+ /* string args above */
+ {Opt_ip, "ip=%s"},
+ {Opt_noshare, "noshare"},
+ {Opt_dirstat, "dirstat"},
+ {Opt_nodirstat, "nodirstat"},
+ {Opt_rbytes, "rbytes"},
+ {Opt_norbytes, "norbytes"},
+ {Opt_nocrc, "nocrc"},
+ {Opt_noasyncreaddir, "noasyncreaddir"},
+ {-1, NULL}
+};
+
+
+/*
+ * Parse an ip[:port] list into an addr array. Use the default
+ * monitor port if a port isn't specified.
+ */
+#define ADDR_DELIM(c) ((!c) || (c == ':') || (c == ','))
+
+static int parse_ips(const char *c, const char *end,
+ struct ceph_entity_addr *addr,
+ int max_count, int *count)
+{
+ int mon_count;
+ const char *p = c;
+
+ dout("parse_ips on '%.*s'\n", (int)(end-c), c);
+ for (mon_count = 0; mon_count < max_count; mon_count++) {
+ const char *ipend;
+ __be32 quad;
+
+ if (!in4_pton(p, end - p, (u8 *)&quad, ',', &ipend))
+ goto bad;
+ *(__be32 *)&addr[mon_count].ipaddr.sin_addr.s_addr = quad;
+ p = ipend;
+
+ /* port? */
+ if (p < end && *p == ':') {
+ long port = 0;
+
+ p++;
+ while (p < end && *p >= '0' && *p <= '9') {
+ port = (port * 10) + (*p - '0');
+ p++;
+ }
+ if (port > 65535 || port == 0)
+ goto bad;
+ addr[mon_count].ipaddr.sin_port = htons(port);
+ } else
+ addr[mon_count].ipaddr.sin_port = htons(CEPH_MON_PORT);
+
+ dout("parse_ips got %u.%u.%u.%u:%u\n",
+ IPQUADPORT(addr[mon_count].ipaddr));
+
+ if (p == end)
+ break;
+ if (*p != ',')
+ goto bad;
+ p++;
+ }
+
+ if (p != end)
+ goto bad;
+
+ if (count)
+ *count = mon_count + 1;
+ return 0;
+
+bad:
+ pr_err("ceph parse_ips bad ip '%s'\n", c);
+ return -EINVAL;
+}
+
+static int parse_mount_args(struct ceph_client *client,
+ int flags, char *options, const char *dev_name,
+ const char **path)
+{
+ struct ceph_mount_args *args = &client->mount_args;
+ const char *c;
+ int err;
+ substring_t argstr[MAX_OPT_ARGS];
+ int num_mon;
+ struct ceph_entity_addr mon_addr[CEPH_MAX_MON_MOUNT_ADDR];
+ int i;
+
+ dout("parse_mount_args dev_name '%s'\n", dev_name);
+ memset(args, 0, sizeof(*args));
+
+ /* start with defaults */
+ args->sb_flags = flags;
+ args->flags = CEPH_OPT_DEFAULT;
+ args->osd_timeout = 5; /* seconds */
+ args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
+ args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
+ args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
+ args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
+ args->cap_release_safety = CEPH_CAPS_PER_RELEASE * 4;
+ args->max_readdir = 1024;
+
+ /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
+ if (!dev_name)
+ return -EINVAL;
+ *path = strstr(dev_name, ":/");
+ if (*path == NULL) {
+ pr_err("ceph device name is missing path (no :/ in %s)\n",
+ dev_name);
+ return -EINVAL;
+ }
+
+ /* get mon ip(s) */
+ err = parse_ips(dev_name, *path, mon_addr,
+ CEPH_MAX_MON_MOUNT_ADDR, &num_mon);
+ if (err < 0)
+ return err;
+
+ /* build initial monmap */
+ client->monc.monmap = kzalloc(sizeof(*client->monc.monmap) +
+ num_mon*sizeof(client->monc.monmap->mon_inst[0]),
+ GFP_KERNEL);
+ if (!client->monc.monmap)
+ return -ENOMEM;
+ for (i = 0; i < num_mon; i++) {
+ client->monc.monmap->mon_inst[i].addr = mon_addr[i];
+ client->monc.monmap->mon_inst[i].addr.ipaddr.sin_family =
+ AF_INET;
+ client->monc.monmap->mon_inst[i].addr.erank = 0;
+ client->monc.monmap->mon_inst[i].addr.nonce = 0;
+ client->monc.monmap->mon_inst[i].name.type =
+ cpu_to_le32(CEPH_ENTITY_TYPE_MON);
+ client->monc.monmap->mon_inst[i].name.num = cpu_to_le32(i);
+ }
+ client->monc.monmap->num_mon = num_mon;
+ 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 */
+ *path += 2;
+ dout("server path '%s'\n", *path);
+
+ /* parse mount options */
+ while ((c = strsep(&options, ",")) != NULL) {
+ int token, intval, ret;
+ if (!*c)
+ continue;
+ token = match_token((char *)c, arg_tokens, argstr);
+ if (token < 0) {
+ pr_err("ceph bad mount option at '%s'\n", c);
+ return -EINVAL;
+
+ }
+ if (token < Opt_ip) {
+ ret = match_int(&argstr[0], &intval);
+ if (ret < 0) {
+ pr_err("ceph bad mount option arg (not int) "
+ "at '%s'\n", c);
+ continue;
+ }
+ dout("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_ips(argstr[0].from,
+ argstr[0].to,
+ &args->my_addr,
+ 1, NULL);
+ if (err < 0)
+ return err;
+ args->flags |= CEPH_OPT_MYIP;
+ break;
+
+ case Opt_snapdirname:
+ kfree(args->snapdir_name);
+ args->snapdir_name = kstrndup(argstr[0].from,
+ argstr[0].to-argstr[0].from,
+ GFP_KERNEL);
+ break;
+ case Opt_secret:
+ args->secret = kstrndup(argstr[0].from,
+ argstr[0].to-argstr[0].from,
+ GFP_KERNEL);
+ 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_caps_wanted_delay_min:
+ args->caps_wanted_delay_min = intval;
+ break;
+ case Opt_caps_wanted_delay_max:
+ args->caps_wanted_delay_max = intval;
+ break;
+ case Opt_readdir_max_entries:
+ args->max_readdir = intval;
+ break;
+
+ case Opt_noshare:
+ args->flags |= CEPH_OPT_NOSHARE;
+ break;
+
+ case Opt_dirstat:
+ args->flags |= CEPH_OPT_DIRSTAT;
+ break;
+ case Opt_nodirstat:
+ args->flags &= ~CEPH_OPT_DIRSTAT;
+ break;
+ case Opt_rbytes:
+ args->flags |= CEPH_OPT_RBYTES;
+ break;
+ case Opt_norbytes:
+ args->flags &= ~CEPH_OPT_RBYTES;
+ break;
+ case Opt_nocrc:
+ args->flags |= CEPH_OPT_NOCRC;
+ break;
+ case Opt_noasyncreaddir:
+ args->flags |= CEPH_OPT_NOASYNCREADDIR;
+ break;
+
+ default:
+ BUG_ON(token);
+ }
+ }
+
+ return 0;
+}
+
+static void release_mount_args(struct ceph_mount_args *args)
+{
+ kfree(args->snapdir_name);
+ args->snapdir_name = 0;
+ kfree(args->secret);
+ args->secret = 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->mount_err = 0;
+ client->signed_ticket = NULL;
+ client->signed_ticket_len = 0;
+
+ err = -ENOMEM;
+ 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)
+ goto fail;
+ err = ceph_osdc_init(&client->osdc, client);
+ if (err < 0)
+ goto fail;
+ ceph_mdsc_init(&client->mdsc, client);
+ return client;
+
+fail:
+ return ERR_PTR(err);
+}
+
+static void ceph_destroy_client(struct ceph_client *client)
+{
+ dout("destroy_client %p\n", client);
+
+ /* unmount */
+ ceph_mdsc_stop(&client->mdsc);
+ ceph_monc_stop(&client->monc);
+ ceph_osdc_stop(&client->osdc);
+
+ kfree(client->signed_ticket);
+
+ ceph_debugfs_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);
+ if (client->wb_pagevec_pool)
+ mempool_destroy(client->wb_pagevec_pool);
+
+ release_mount_args(&client->mount_args);
+
+ kfree(client);
+ dout("destroy_client %p done\n", client);
+}
+
+/*
+ * true if we have the mon map (and have thus joined the cluster)
+ */
+static int have_mon_map(struct ceph_client *client)
+{
+ return client->monc.monmap && client->monc.monmap->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("open_root_inode opening '%s'\n", path);
+ req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
+ if (IS_ERR(req))
+ return ERR_PTR(PTR_ERR(req));
+ req->r_path1 = kstrdup(path, GFP_NOFS);
+ req->r_ino1.ino = CEPH_INO_ROOT;
+ req->r_ino1.snap = CEPH_NOSNAP;
+ req->r_started = started;
+ req->r_timeout = client->mount_args.mount_timeout * HZ;
+ req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
+ req->r_num_caps = 2;
+ err = ceph_mdsc_do_request(mdsc, NULL, req);
+ if (err == 0) {
+ dout("open_root_inode success\n");
+ if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
+ client->sb->s_root == NULL)
+ root = d_alloc_root(req->r_target_inode);
+ else
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
+ root = d_obtain_alias(req->r_target_inode);
+#else
+ root = d_alloc_anon(req->r_target_inode);
+#endif
+ req->r_target_inode = NULL;
+ dout("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, and open root directory.
+ */
+static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
+ const char *path)
+{
+ struct ceph_entity_addr *myaddr = NULL;
+ int err;
+ unsigned long timeout = client->mount_args.mount_timeout * HZ;
+ unsigned long started = jiffies; /* note the start time */
+ struct dentry *root;
+
+ dout("mount start\n");
+ mutex_lock(&client->mount_mutex);
+
+ /* initialize the messenger */
+ if (client->msgr == NULL) {
+ if (ceph_test_opt(client, 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->nocrc = ceph_test_opt(client, NOCRC);
+ }
+
+ /* send mount request, and wait for mon, mds, and osd maps */
+ err = ceph_monc_request_mount(&client->monc);
+ if (err < 0)
+ goto out;
+
+ while (!have_mon_map(client) && !client->mount_err) {
+ err = -EIO;
+ if (timeout && time_after_eq(jiffies, started + timeout))
+ goto out;
+
+ /* wait */
+ dout("mount waiting for mount\n");
+ err = wait_event_interruptible_timeout(client->mount_wq,
+ client->mount_err || have_mon_map(client),
+ timeout);
+ if (err == -EINTR || err == -ERESTARTSYS)
+ goto out;
+ if (client->mount_err) {
+ err = client->mount_err;
+ goto out;
+ }
+ }
+
+ dout("mount opening root\n");
+ root = open_root_dentry(client, "", started);
+ if (IS_ERR(root)) {
+ err = PTR_ERR(root);
+ goto out;
+ }
+ if (client->sb->s_root)
+ dput(root);
+ else
+ client->sb->s_root = root;
+
+ if (path[0] == 0) {
+ dget(root);
+ } else {
+ dout("mount opening base mountpoint\n");
+ root = open_root_dentry(client, path, started);
+ if (IS_ERR(root)) {
+ err = PTR_ERR(root);
+ dput(client->sb->s_root);
+ client->sb->s_root = NULL;
+ goto out;
+ }
+ }
+
+ mnt->mnt_root = root;
+ mnt->mnt_sb = client->sb;
+
+ client->mount_state = CEPH_MOUNT_MOUNTED;
+ dout("mount success\n");
+ err = 0;
+
+out:
+ mutex_unlock(&client->mount_mutex);
+ return err;
+}
+
+static int ceph_set_super(struct super_block *s, void *data)
+{
+ struct ceph_client *client = data;
+ int ret;
+
+ dout("set_super %p data %p\n", s, data);
+
+ s->s_flags = client->mount_args.sb_flags;
+ s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
+
+ 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("ceph_compare_super %p\n", sb);
+ if (args->flags & CEPH_OPT_FSID) {
+ if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
+ dout("fsid doesn't match\n");
+ return 0;
+ }
+ } else {
+ /* do we share (a) monitor? */
+ for (i = 0; i < new->monc.monmap->num_mon; i++)
+ if (ceph_monmap_contains(other->monc.monmap,
+ &new->monc.monmap->mon_inst[i].addr))
+ break;
+ if (i == new->monc.monmap->num_mon) {
+ dout("mon ip not part of monmap\n");
+ return 0;
+ }
+ dout("mon ip matches existing sb %p\n", sb);
+ }
+ if (args->sb_flags != other->mount_args.sb_flags) {
+ dout("flags differ\n");
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * construct our own bdi so we can control readahead, etc.
+ */
+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_MOUNT_RSIZE_DEFAULT >> 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("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(client, flags, data, dev_name, &path);
+ if (err < 0)
+ goto out;
+
+ /* set up mempools */
+ err = -ENOMEM;
+ client->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
+ client->mount_args.wsize >> PAGE_CACHE_SHIFT);
+ if (!client->wb_pagevec_pool)
+ goto out;
+
+ if (client->mount_args.flags & CEPH_OPT_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("get_sb got existing client %p\n", client);
+ } else {
+ dout("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("root %p inode %p ino %llx.%llx\n", mnt->mnt_root,
+ mnt->mnt_root->d_inode, 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("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("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,
+};
+
+#define _STRINGIFY(x) #x
+#define STRINGIFY(x) _STRINGIFY(x)
+
+static int __init init_ceph(void)
+{
+ int ret = 0;
+
+ pr_info("ceph init (%s)\n", STRINGIFY(CEPH_GIT_VER));
+
+ ret = ceph_debugfs_init();
+ if (ret < 0)
+ goto out;
+
+ ret = ceph_msgr_init();
+ if (ret < 0)
+ goto out_debugfs;
+
+ ret = init_caches();
+ if (ret)
+ goto out_msgr;
+
+ ceph_caps_init();
+
+ ret = register_filesystem(&ceph_fs_type);
+ if (ret)
+ goto out_icache;
+ return 0;
+
+out_icache:
+ destroy_caches();
+out_msgr:
+ ceph_msgr_exit();
+out_debugfs:
+ ceph_debugfs_cleanup();
+out:
+ return ret;
+}
+
+static void __exit exit_ceph(void)
+{
+ dout("exit_ceph\n");
+ unregister_filesystem(&ceph_fs_type);
+ ceph_caps_finalize();
+ destroy_caches();
+ ceph_msgr_exit();
+ ceph_debugfs_cleanup();
+}
+
+module_init(init_ceph);
+module_exit(exit_ceph);
+
+MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
+MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
+MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
+MODULE_DESCRIPTION("Ceph filesystem for Linux");
+MODULE_LICENSE("GPL");
--
1.5.6.5


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  Last update: 2009-09-09 01:11    [from the cache]
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