![Sage Weil](/assets/img/avatar_default.png)
Unregister and destroy the bdi in put_super, after mount is r/o, but before put_anon_super releases the device name. For symmetry, bdi_destroy in destroy_client (we bdi_init in create_client). Only set s_bdi if bdi_register succeeds, since we use it to decide whether to bdi_unregister. Signed-off-by: Sage Weil <sage@newdream.net>
1042 lines
25 KiB
C
1042 lines
25 KiB
C
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#include "ceph_debug.h"
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#include <linux/backing-dev.h>
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#include <linux/fs.h>
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#include <linux/inet.h>
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#include <linux/in6.h>
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#include <linux/module.h>
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#include <linux/mount.h>
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#include <linux/parser.h>
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#include <linux/rwsem.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/statfs.h>
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#include <linux/string.h>
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#include <linux/version.h>
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#include <linux/vmalloc.h>
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#include "decode.h"
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#include "super.h"
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#include "mon_client.h"
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#include "auth.h"
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/*
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* Ceph superblock operations
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*
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* Handle the basics of mounting, unmounting.
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*/
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/*
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* find filename portion of a path (/foo/bar/baz -> baz)
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*/
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const char *ceph_file_part(const char *s, int len)
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{
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const char *e = s + len;
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while (e != s && *(e-1) != '/')
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e--;
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return e;
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}
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/*
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* super ops
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*/
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static void ceph_put_super(struct super_block *s)
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{
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struct ceph_client *client = ceph_sb_to_client(s);
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dout("put_super\n");
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ceph_mdsc_close_sessions(&client->mdsc);
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/*
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* ensure we release the bdi before put_anon_super releases
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* the device name.
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*/
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if (s->s_bdi == &client->backing_dev_info) {
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bdi_unregister(&client->backing_dev_info);
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s->s_bdi = NULL;
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}
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return;
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}
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static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct ceph_client *client = ceph_inode_to_client(dentry->d_inode);
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struct ceph_monmap *monmap = client->monc.monmap;
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struct ceph_statfs st;
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u64 fsid;
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int err;
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dout("statfs\n");
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err = ceph_monc_do_statfs(&client->monc, &st);
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if (err < 0)
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return err;
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/* fill in kstatfs */
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buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
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/*
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* express utilization in terms of large blocks to avoid
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* overflow on 32-bit machines.
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*/
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buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
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buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
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buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
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(CEPH_BLOCK_SHIFT-10);
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buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
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buf->f_files = le64_to_cpu(st.num_objects);
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buf->f_ffree = -1;
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buf->f_namelen = PATH_MAX;
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buf->f_frsize = PAGE_CACHE_SIZE;
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/* leave fsid little-endian, regardless of host endianness */
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fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
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buf->f_fsid.val[0] = fsid & 0xffffffff;
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buf->f_fsid.val[1] = fsid >> 32;
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return 0;
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}
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static int ceph_syncfs(struct super_block *sb, int wait)
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{
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dout("sync_fs %d\n", wait);
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ceph_osdc_sync(&ceph_client(sb)->osdc);
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ceph_mdsc_sync(&ceph_client(sb)->mdsc);
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dout("sync_fs %d done\n", wait);
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return 0;
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}
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/**
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* ceph_show_options - Show mount options in /proc/mounts
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* @m: seq_file to write to
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* @mnt: mount descriptor
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*/
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static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
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{
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struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
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struct ceph_mount_args *args = client->mount_args;
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if (args->flags & CEPH_OPT_FSID)
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seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
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le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]),
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le64_to_cpu(*(__le64 *)&args->fsid.fsid[8]));
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if (args->flags & CEPH_OPT_NOSHARE)
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seq_puts(m, ",noshare");
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if (args->flags & CEPH_OPT_DIRSTAT)
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seq_puts(m, ",dirstat");
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if ((args->flags & CEPH_OPT_RBYTES) == 0)
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seq_puts(m, ",norbytes");
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if (args->flags & CEPH_OPT_NOCRC)
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seq_puts(m, ",nocrc");
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if (args->flags & CEPH_OPT_NOASYNCREADDIR)
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seq_puts(m, ",noasyncreaddir");
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if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
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seq_printf(m, ",snapdirname=%s", args->snapdir_name);
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if (args->name)
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seq_printf(m, ",name=%s", args->name);
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if (args->secret)
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seq_puts(m, ",secret=<hidden>");
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return 0;
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}
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/*
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* caches
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*/
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struct kmem_cache *ceph_inode_cachep;
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struct kmem_cache *ceph_cap_cachep;
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struct kmem_cache *ceph_dentry_cachep;
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struct kmem_cache *ceph_file_cachep;
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static void ceph_inode_init_once(void *foo)
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{
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struct ceph_inode_info *ci = foo;
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inode_init_once(&ci->vfs_inode);
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}
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static int default_congestion_kb(void)
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{
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int congestion_kb;
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/*
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* Copied from NFS
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*
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* congestion size, scale with available memory.
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*
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* 64MB: 8192k
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* 128MB: 11585k
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* 256MB: 16384k
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* 512MB: 23170k
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* 1GB: 32768k
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* 2GB: 46340k
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* 4GB: 65536k
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* 8GB: 92681k
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* 16GB: 131072k
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*
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* This allows larger machines to have larger/more transfers.
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* Limit the default to 256M
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*/
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congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
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if (congestion_kb > 256*1024)
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congestion_kb = 256*1024;
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return congestion_kb;
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}
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static int __init init_caches(void)
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{
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ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
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sizeof(struct ceph_inode_info),
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__alignof__(struct ceph_inode_info),
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(SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
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ceph_inode_init_once);
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if (ceph_inode_cachep == NULL)
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return -ENOMEM;
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ceph_cap_cachep = KMEM_CACHE(ceph_cap,
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SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
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if (ceph_cap_cachep == NULL)
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goto bad_cap;
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ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
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SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
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if (ceph_dentry_cachep == NULL)
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goto bad_dentry;
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ceph_file_cachep = KMEM_CACHE(ceph_file_info,
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SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
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if (ceph_file_cachep == NULL)
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goto bad_file;
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return 0;
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bad_file:
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kmem_cache_destroy(ceph_dentry_cachep);
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bad_dentry:
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kmem_cache_destroy(ceph_cap_cachep);
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bad_cap:
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kmem_cache_destroy(ceph_inode_cachep);
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return -ENOMEM;
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}
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static void destroy_caches(void)
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{
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kmem_cache_destroy(ceph_inode_cachep);
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kmem_cache_destroy(ceph_cap_cachep);
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kmem_cache_destroy(ceph_dentry_cachep);
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kmem_cache_destroy(ceph_file_cachep);
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}
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/*
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* ceph_umount_begin - initiate forced umount. Tear down down the
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* mount, skipping steps that may hang while waiting for server(s).
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*/
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static void ceph_umount_begin(struct super_block *sb)
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{
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struct ceph_client *client = ceph_sb_to_client(sb);
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dout("ceph_umount_begin - starting forced umount\n");
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if (!client)
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return;
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client->mount_state = CEPH_MOUNT_SHUTDOWN;
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return;
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}
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static const struct super_operations ceph_super_ops = {
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.alloc_inode = ceph_alloc_inode,
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.destroy_inode = ceph_destroy_inode,
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.write_inode = ceph_write_inode,
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.sync_fs = ceph_syncfs,
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.put_super = ceph_put_super,
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.show_options = ceph_show_options,
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.statfs = ceph_statfs,
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.umount_begin = ceph_umount_begin,
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};
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const char *ceph_msg_type_name(int type)
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{
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switch (type) {
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case CEPH_MSG_SHUTDOWN: return "shutdown";
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case CEPH_MSG_PING: return "ping";
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case CEPH_MSG_AUTH: return "auth";
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case CEPH_MSG_AUTH_REPLY: return "auth_reply";
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case CEPH_MSG_MON_MAP: return "mon_map";
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case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
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case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
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case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
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case CEPH_MSG_STATFS: return "statfs";
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case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
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case CEPH_MSG_MDS_MAP: return "mds_map";
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case CEPH_MSG_CLIENT_SESSION: return "client_session";
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case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
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case CEPH_MSG_CLIENT_REQUEST: return "client_request";
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case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
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case CEPH_MSG_CLIENT_REPLY: return "client_reply";
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case CEPH_MSG_CLIENT_CAPS: return "client_caps";
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case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
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case CEPH_MSG_CLIENT_SNAP: return "client_snap";
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case CEPH_MSG_CLIENT_LEASE: return "client_lease";
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case CEPH_MSG_OSD_MAP: return "osd_map";
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case CEPH_MSG_OSD_OP: return "osd_op";
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case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
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default: return "unknown";
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}
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}
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/*
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* mount options
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*/
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enum {
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Opt_fsidmajor,
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Opt_fsidminor,
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Opt_monport,
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Opt_wsize,
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Opt_rsize,
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Opt_osdtimeout,
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Opt_osdkeepalivetimeout,
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Opt_mount_timeout,
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Opt_osd_idle_ttl,
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Opt_caps_wanted_delay_min,
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Opt_caps_wanted_delay_max,
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Opt_readdir_max_entries,
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Opt_congestion_kb,
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Opt_last_int,
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/* int args above */
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Opt_snapdirname,
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Opt_name,
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Opt_secret,
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Opt_last_string,
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/* string args above */
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Opt_ip,
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Opt_noshare,
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Opt_dirstat,
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Opt_nodirstat,
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Opt_rbytes,
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Opt_norbytes,
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Opt_nocrc,
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Opt_noasyncreaddir,
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};
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static match_table_t arg_tokens = {
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{Opt_fsidmajor, "fsidmajor=%ld"},
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{Opt_fsidminor, "fsidminor=%ld"},
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{Opt_monport, "monport=%d"},
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{Opt_wsize, "wsize=%d"},
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{Opt_rsize, "rsize=%d"},
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{Opt_osdtimeout, "osdtimeout=%d"},
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{Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
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{Opt_mount_timeout, "mount_timeout=%d"},
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{Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
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{Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
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{Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
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{Opt_readdir_max_entries, "readdir_max_entries=%d"},
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{Opt_congestion_kb, "write_congestion_kb=%d"},
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/* int args above */
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{Opt_snapdirname, "snapdirname=%s"},
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{Opt_name, "name=%s"},
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{Opt_secret, "secret=%s"},
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/* string args above */
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{Opt_ip, "ip=%s"},
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{Opt_noshare, "noshare"},
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{Opt_dirstat, "dirstat"},
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{Opt_nodirstat, "nodirstat"},
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{Opt_rbytes, "rbytes"},
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{Opt_norbytes, "norbytes"},
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{Opt_nocrc, "nocrc"},
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{Opt_noasyncreaddir, "noasyncreaddir"},
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{-1, NULL}
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};
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static struct ceph_mount_args *parse_mount_args(int flags, char *options,
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const char *dev_name,
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const char **path)
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{
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struct ceph_mount_args *args;
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const char *c;
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int err = -ENOMEM;
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substring_t argstr[MAX_OPT_ARGS];
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args = kzalloc(sizeof(*args), GFP_KERNEL);
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if (!args)
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return ERR_PTR(-ENOMEM);
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args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr),
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GFP_KERNEL);
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if (!args->mon_addr)
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goto out;
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dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name);
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/* start with defaults */
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args->sb_flags = flags;
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args->flags = CEPH_OPT_DEFAULT;
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args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT;
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args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
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args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
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args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */
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args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
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args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
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args->rsize = CEPH_MOUNT_RSIZE_DEFAULT;
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args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
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args->cap_release_safety = CEPH_CAPS_PER_RELEASE * 4;
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args->max_readdir = 1024;
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args->congestion_kb = default_congestion_kb();
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/* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
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err = -EINVAL;
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if (!dev_name)
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goto out;
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*path = strstr(dev_name, ":/");
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if (*path == NULL) {
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pr_err("device name is missing path (no :/ in %s)\n",
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dev_name);
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goto out;
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}
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/* get mon ip(s) */
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err = ceph_parse_ips(dev_name, *path, args->mon_addr,
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CEPH_MAX_MON, &args->num_mon);
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if (err < 0)
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goto out;
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/* path on server */
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*path += 2;
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dout("server path '%s'\n", *path);
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/* parse mount options */
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while ((c = strsep(&options, ",")) != NULL) {
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int token, intval, ret;
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if (!*c)
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continue;
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err = -EINVAL;
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token = match_token((char *)c, arg_tokens, argstr);
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if (token < 0) {
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pr_err("bad mount option at '%s'\n", c);
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goto out;
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}
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if (token < Opt_last_int) {
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ret = match_int(&argstr[0], &intval);
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if (ret < 0) {
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pr_err("bad mount option arg (not int) "
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"at '%s'\n", c);
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continue;
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}
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dout("got int token %d val %d\n", token, intval);
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} else if (token > Opt_last_int && token < Opt_last_string) {
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dout("got string token %d val %s\n", token,
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argstr[0].from);
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} else {
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dout("got token %d\n", token);
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}
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switch (token) {
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case Opt_fsidmajor:
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*(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval);
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break;
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case Opt_fsidminor:
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*(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval);
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break;
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case Opt_ip:
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err = ceph_parse_ips(argstr[0].from,
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argstr[0].to,
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&args->my_addr,
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1, NULL);
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if (err < 0)
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goto out;
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args->flags |= CEPH_OPT_MYIP;
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break;
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case Opt_snapdirname:
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kfree(args->snapdir_name);
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args->snapdir_name = kstrndup(argstr[0].from,
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argstr[0].to-argstr[0].from,
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GFP_KERNEL);
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break;
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case Opt_name:
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args->name = kstrndup(argstr[0].from,
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argstr[0].to-argstr[0].from,
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GFP_KERNEL);
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break;
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case Opt_secret:
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args->secret = kstrndup(argstr[0].from,
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argstr[0].to-argstr[0].from,
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GFP_KERNEL);
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break;
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/* misc */
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case Opt_wsize:
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args->wsize = intval;
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break;
|
|
case Opt_rsize:
|
|
args->rsize = intval;
|
|
break;
|
|
case Opt_osdtimeout:
|
|
args->osd_timeout = intval;
|
|
break;
|
|
case Opt_osdkeepalivetimeout:
|
|
args->osd_keepalive_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_congestion_kb:
|
|
args->congestion_kb = 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 args;
|
|
|
|
out:
|
|
kfree(args->mon_addr);
|
|
kfree(args);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static void destroy_mount_args(struct ceph_mount_args *args)
|
|
{
|
|
dout("destroy_mount_args %p\n", args);
|
|
kfree(args->snapdir_name);
|
|
args->snapdir_name = NULL;
|
|
kfree(args->name);
|
|
args->name = NULL;
|
|
kfree(args->secret);
|
|
args->secret = NULL;
|
|
kfree(args);
|
|
}
|
|
|
|
/*
|
|
* create a fresh client instance
|
|
*/
|
|
static struct ceph_client *ceph_create_client(struct ceph_mount_args *args)
|
|
{
|
|
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->auth_wq);
|
|
|
|
client->sb = NULL;
|
|
client->mount_state = CEPH_MOUNT_MOUNTING;
|
|
client->mount_args = args;
|
|
|
|
client->msgr = NULL;
|
|
|
|
client->auth_err = 0;
|
|
atomic_long_set(&client->writeback_count, 0);
|
|
|
|
err = bdi_init(&client->backing_dev_info);
|
|
if (err < 0)
|
|
goto fail;
|
|
|
|
err = -ENOMEM;
|
|
client->wb_wq = create_workqueue("ceph-writeback");
|
|
if (client->wb_wq == NULL)
|
|
goto fail_bdi;
|
|
client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
|
|
if (client->pg_inv_wq == NULL)
|
|
goto fail_wb_wq;
|
|
client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
|
|
if (client->trunc_wq == NULL)
|
|
goto fail_pg_inv_wq;
|
|
|
|
/* 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 fail_trunc_wq;
|
|
|
|
/* caps */
|
|
client->min_caps = args->max_readdir;
|
|
ceph_adjust_min_caps(client->min_caps);
|
|
|
|
/* subsystems */
|
|
err = ceph_monc_init(&client->monc, client);
|
|
if (err < 0)
|
|
goto fail_mempool;
|
|
err = ceph_osdc_init(&client->osdc, client);
|
|
if (err < 0)
|
|
goto fail_monc;
|
|
err = ceph_mdsc_init(&client->mdsc, client);
|
|
if (err < 0)
|
|
goto fail_osdc;
|
|
return client;
|
|
|
|
fail_osdc:
|
|
ceph_osdc_stop(&client->osdc);
|
|
fail_monc:
|
|
ceph_monc_stop(&client->monc);
|
|
fail_mempool:
|
|
mempool_destroy(client->wb_pagevec_pool);
|
|
fail_trunc_wq:
|
|
destroy_workqueue(client->trunc_wq);
|
|
fail_pg_inv_wq:
|
|
destroy_workqueue(client->pg_inv_wq);
|
|
fail_wb_wq:
|
|
destroy_workqueue(client->wb_wq);
|
|
fail_bdi:
|
|
bdi_destroy(&client->backing_dev_info);
|
|
fail:
|
|
kfree(client);
|
|
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);
|
|
|
|
ceph_adjust_min_caps(-client->min_caps);
|
|
|
|
ceph_debugfs_client_cleanup(client);
|
|
destroy_workqueue(client->wb_wq);
|
|
destroy_workqueue(client->pg_inv_wq);
|
|
destroy_workqueue(client->trunc_wq);
|
|
|
|
bdi_destroy(&client->backing_dev_info);
|
|
|
|
if (client->msgr)
|
|
ceph_messenger_destroy(client->msgr);
|
|
mempool_destroy(client->wb_pagevec_pool);
|
|
|
|
destroy_mount_args(client->mount_args);
|
|
|
|
kfree(client);
|
|
dout("destroy_client %p done\n", client);
|
|
}
|
|
|
|
/*
|
|
* Initially learn our fsid, or verify an fsid matches.
|
|
*/
|
|
int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
|
|
{
|
|
if (client->have_fsid) {
|
|
if (ceph_fsid_compare(&client->fsid, fsid)) {
|
|
pr_err("bad fsid, had " FSID_FORMAT " got " FSID_FORMAT,
|
|
PR_FSID(&client->fsid), PR_FSID(fsid));
|
|
return -1;
|
|
}
|
|
} else {
|
|
pr_info("client%lld fsid " FSID_FORMAT "\n",
|
|
client->monc.auth->global_id, PR_FSID(fsid));
|
|
memcpy(&client->fsid, fsid, sizeof(*fsid));
|
|
ceph_debugfs_client_init(client);
|
|
client->have_fsid = true;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
root = d_obtain_alias(req->r_target_inode);
|
|
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);
|
|
}
|
|
|
|
/* open session, and wait for mon, mds, and osd maps */
|
|
err = ceph_monc_open_session(&client->monc);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
while (!have_mon_map(client)) {
|
|
err = -EIO;
|
|
if (timeout && time_after_eq(jiffies, started + timeout))
|
|
goto out;
|
|
|
|
/* wait */
|
|
dout("mount waiting for mon_map\n");
|
|
err = wait_event_interruptible_timeout(client->auth_wq,
|
|
have_mon_map(client) || (client->auth_err < 0),
|
|
timeout);
|
|
if (err == -EINTR || err == -ERESTARTSYS)
|
|
goto out;
|
|
if (client->auth_err < 0) {
|
|
err = client->auth_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_register_bdi(struct super_block *sb, struct ceph_client *client)
|
|
{
|
|
int err;
|
|
|
|
/* set ra_pages based on rsize mount option? */
|
|
if (client->mount_args->rsize >= PAGE_CACHE_SIZE)
|
|
client->backing_dev_info.ra_pages =
|
|
(client->mount_args->rsize + PAGE_CACHE_SIZE - 1)
|
|
>> PAGE_SHIFT;
|
|
err = bdi_register_dev(&client->backing_dev_info, sb->s_dev);
|
|
if (!err)
|
|
sb->s_bdi = &client->backing_dev_info;
|
|
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 = NULL;
|
|
struct ceph_mount_args *args;
|
|
|
|
dout("ceph_get_sb\n");
|
|
args = parse_mount_args(flags, data, dev_name, &path);
|
|
if (IS_ERR(args)) {
|
|
err = PTR_ERR(args);
|
|
goto out_final;
|
|
}
|
|
|
|
/* create client (which we may/may not use) */
|
|
client = ceph_create_client(args);
|
|
if (IS_ERR(client)) {
|
|
err = PTR_ERR(client);
|
|
goto out_final;
|
|
}
|
|
|
|
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_register_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);
|
|
kill_anon_super(s); /* will call put_super after sb is r/o */
|
|
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;
|
|
|
|
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;
|
|
|
|
pr_info("loaded (mon/mds/osd proto %d/%d/%d, osdmap %d/%d %d/%d)\n",
|
|
CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL,
|
|
CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT,
|
|
CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT);
|
|
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");
|