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![Geert Uytterhoeven](/assets/img/avatar_default.png)
fs/ceph/super.c: In function ‘ceph_real_mount’:
fs/ceph/super.c:818: warning: ‘root’ may be used uninitialized in this function
If s_root is already valid, dentry pointer root is never initialized,
and returned by ceph_real_mount(). This will cause a crash later when
the caller dereferences the pointer.
Fixes: ce2728aaa8
("ceph: avoid accessing / when mounting a subpath")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Yan, Zheng <zyan@redhat.com>
1093 lines
26 KiB
C
1093 lines
26 KiB
C
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#include <linux/ceph/ceph_debug.h>
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#include <linux/backing-dev.h>
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#include <linux/ctype.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/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 "super.h"
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#include "mds_client.h"
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#include "cache.h"
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#include <linux/ceph/ceph_features.h>
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#include <linux/ceph/decode.h>
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#include <linux/ceph/mon_client.h>
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#include <linux/ceph/auth.h>
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#include <linux/ceph/debugfs.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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* 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_fs_client *fsc = ceph_sb_to_client(s);
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dout("put_super\n");
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ceph_mdsc_close_sessions(fsc->mdsc);
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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_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
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struct ceph_monmap *monmap = fsc->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(&fsc->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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* NOTE: for the time being, we make bsize == frsize to humor
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* not-yet-ancient versions of glibc that are broken.
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* Someday, we will probably want to report a real block
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* size... whatever that may mean for a network file system!
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*/
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buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
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buf->f_frsize = 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_avail) >> (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 = NAME_MAX;
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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_sync_fs(struct super_block *sb, int wait)
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{
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struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
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if (!wait) {
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dout("sync_fs (non-blocking)\n");
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ceph_flush_dirty_caps(fsc->mdsc);
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dout("sync_fs (non-blocking) done\n");
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return 0;
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}
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dout("sync_fs (blocking)\n");
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ceph_osdc_sync(&fsc->client->osdc);
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ceph_mdsc_sync(fsc->mdsc);
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dout("sync_fs (blocking) done\n");
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return 0;
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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_wsize,
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Opt_rsize,
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Opt_rasize,
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Opt_caps_wanted_delay_min,
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Opt_caps_wanted_delay_max,
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Opt_cap_release_safety,
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Opt_readdir_max_entries,
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Opt_readdir_max_bytes,
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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_mds_namespace,
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Opt_last_string,
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/* string args above */
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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_asyncreaddir,
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Opt_noasyncreaddir,
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Opt_dcache,
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Opt_nodcache,
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Opt_ino32,
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Opt_noino32,
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Opt_fscache,
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Opt_nofscache,
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Opt_poolperm,
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Opt_nopoolperm,
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#ifdef CONFIG_CEPH_FS_POSIX_ACL
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Opt_acl,
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#endif
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Opt_noacl,
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};
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static match_table_t fsopt_tokens = {
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{Opt_wsize, "wsize=%d"},
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{Opt_rsize, "rsize=%d"},
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{Opt_rasize, "rasize=%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_cap_release_safety, "cap_release_safety=%d"},
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{Opt_readdir_max_entries, "readdir_max_entries=%d"},
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{Opt_readdir_max_bytes, "readdir_max_bytes=%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_mds_namespace, "mds_namespace=%s"},
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/* string args above */
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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_asyncreaddir, "asyncreaddir"},
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{Opt_noasyncreaddir, "noasyncreaddir"},
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{Opt_dcache, "dcache"},
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{Opt_nodcache, "nodcache"},
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{Opt_ino32, "ino32"},
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{Opt_noino32, "noino32"},
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{Opt_fscache, "fsc"},
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{Opt_nofscache, "nofsc"},
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{Opt_poolperm, "poolperm"},
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{Opt_nopoolperm, "nopoolperm"},
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#ifdef CONFIG_CEPH_FS_POSIX_ACL
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{Opt_acl, "acl"},
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#endif
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{Opt_noacl, "noacl"},
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{-1, NULL}
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};
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static int parse_fsopt_token(char *c, void *private)
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{
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struct ceph_mount_options *fsopt = private;
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substring_t argstr[MAX_OPT_ARGS];
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int token, intval, ret;
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token = match_token((char *)c, fsopt_tokens, argstr);
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if (token < 0)
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return -EINVAL;
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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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return ret;
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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_snapdirname:
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kfree(fsopt->snapdir_name);
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fsopt->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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if (!fsopt->snapdir_name)
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return -ENOMEM;
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break;
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case Opt_mds_namespace:
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fsopt->mds_namespace = kstrndup(argstr[0].from,
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argstr[0].to-argstr[0].from,
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GFP_KERNEL);
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if (!fsopt->mds_namespace)
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return -ENOMEM;
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break;
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/* misc */
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case Opt_wsize:
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fsopt->wsize = intval;
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break;
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case Opt_rsize:
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fsopt->rsize = intval;
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break;
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case Opt_rasize:
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fsopt->rasize = intval;
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break;
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case Opt_caps_wanted_delay_min:
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fsopt->caps_wanted_delay_min = intval;
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break;
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case Opt_caps_wanted_delay_max:
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fsopt->caps_wanted_delay_max = intval;
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break;
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case Opt_readdir_max_entries:
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fsopt->max_readdir = intval;
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break;
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case Opt_readdir_max_bytes:
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fsopt->max_readdir_bytes = intval;
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break;
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case Opt_congestion_kb:
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fsopt->congestion_kb = intval;
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break;
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case Opt_dirstat:
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fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
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break;
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case Opt_nodirstat:
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fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
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break;
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case Opt_rbytes:
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fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
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break;
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case Opt_norbytes:
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fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
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break;
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case Opt_asyncreaddir:
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fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
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break;
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case Opt_noasyncreaddir:
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fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
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break;
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case Opt_dcache:
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fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
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break;
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case Opt_nodcache:
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fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
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break;
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case Opt_ino32:
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fsopt->flags |= CEPH_MOUNT_OPT_INO32;
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break;
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case Opt_noino32:
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fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
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break;
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case Opt_fscache:
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fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
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break;
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case Opt_nofscache:
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fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
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break;
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case Opt_poolperm:
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fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
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printk ("pool perm");
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break;
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case Opt_nopoolperm:
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fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
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break;
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#ifdef CONFIG_CEPH_FS_POSIX_ACL
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case Opt_acl:
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fsopt->sb_flags |= MS_POSIXACL;
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break;
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#endif
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case Opt_noacl:
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fsopt->sb_flags &= ~MS_POSIXACL;
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break;
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default:
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BUG_ON(token);
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}
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return 0;
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}
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static void destroy_mount_options(struct ceph_mount_options *args)
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{
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dout("destroy_mount_options %p\n", args);
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kfree(args->snapdir_name);
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kfree(args->mds_namespace);
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kfree(args->server_path);
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kfree(args);
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}
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static int strcmp_null(const char *s1, const char *s2)
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{
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if (!s1 && !s2)
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return 0;
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if (s1 && !s2)
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return -1;
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if (!s1 && s2)
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return 1;
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return strcmp(s1, s2);
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}
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static int compare_mount_options(struct ceph_mount_options *new_fsopt,
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struct ceph_options *new_opt,
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struct ceph_fs_client *fsc)
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{
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struct ceph_mount_options *fsopt1 = new_fsopt;
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struct ceph_mount_options *fsopt2 = fsc->mount_options;
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int ofs = offsetof(struct ceph_mount_options, snapdir_name);
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int ret;
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ret = memcmp(fsopt1, fsopt2, ofs);
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if (ret)
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return ret;
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ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
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if (ret)
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return ret;
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ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
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if (ret)
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return ret;
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ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
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if (ret)
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return ret;
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return ceph_compare_options(new_opt, fsc->client);
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}
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static int parse_mount_options(struct ceph_mount_options **pfsopt,
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struct ceph_options **popt,
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int flags, char *options,
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const char *dev_name)
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{
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struct ceph_mount_options *fsopt;
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const char *dev_name_end;
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int err;
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if (!dev_name || !*dev_name)
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return -EINVAL;
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fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
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if (!fsopt)
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return -ENOMEM;
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dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
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fsopt->sb_flags = flags;
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fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
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fsopt->rsize = CEPH_RSIZE_DEFAULT;
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fsopt->rasize = CEPH_RASIZE_DEFAULT;
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fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
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if (!fsopt->snapdir_name) {
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err = -ENOMEM;
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goto out;
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}
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fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
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fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
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fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
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fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
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fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
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fsopt->congestion_kb = default_congestion_kb();
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/*
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* Distinguish the server list from the path in "dev_name".
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* Internally we do not include the leading '/' in the path.
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*
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* "dev_name" will look like:
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* <server_spec>[,<server_spec>...]:[<path>]
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* where
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* <server_spec> is <ip>[:<port>]
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* <path> is optional, but if present must begin with '/'
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*/
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dev_name_end = strchr(dev_name, '/');
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if (dev_name_end) {
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if (strlen(dev_name_end) > 1) {
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fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
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if (!fsopt->server_path) {
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err = -ENOMEM;
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goto out;
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}
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}
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} else {
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dev_name_end = dev_name + strlen(dev_name);
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}
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err = -EINVAL;
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dev_name_end--; /* back up to ':' separator */
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if (dev_name_end < dev_name || *dev_name_end != ':') {
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pr_err("device name is missing path (no : separator in %s)\n",
|
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dev_name);
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goto out;
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}
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dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
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if (fsopt->server_path)
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dout("server path '%s'\n", fsopt->server_path);
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|
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*popt = ceph_parse_options(options, dev_name, dev_name_end,
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parse_fsopt_token, (void *)fsopt);
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if (IS_ERR(*popt)) {
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err = PTR_ERR(*popt);
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goto out;
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}
|
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|
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/* success */
|
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*pfsopt = fsopt;
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return 0;
|
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|
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out:
|
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destroy_mount_options(fsopt);
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return err;
|
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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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* @root: root of that (sub)tree
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*/
|
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static int ceph_show_options(struct seq_file *m, struct dentry *root)
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{
|
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struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
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struct ceph_mount_options *fsopt = fsc->mount_options;
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size_t pos;
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int ret;
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|
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/* a comma between MNT/MS and client options */
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seq_putc(m, ',');
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pos = m->count;
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|
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ret = ceph_print_client_options(m, fsc->client);
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if (ret)
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return ret;
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|
|
/* retract our comma if no client options */
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if (m->count == pos)
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m->count--;
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|
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if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
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seq_puts(m, ",dirstat");
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if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
|
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seq_puts(m, ",rbytes");
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if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
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seq_puts(m, ",noasyncreaddir");
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if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
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seq_puts(m, ",nodcache");
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if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
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seq_puts(m, ",fsc");
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if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
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seq_puts(m, ",nopoolperm");
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|
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#ifdef CONFIG_CEPH_FS_POSIX_ACL
|
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if (fsopt->sb_flags & MS_POSIXACL)
|
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seq_puts(m, ",acl");
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else
|
|
seq_puts(m, ",noacl");
|
|
#endif
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|
|
|
if (fsopt->mds_namespace)
|
|
seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
|
|
if (fsopt->wsize)
|
|
seq_printf(m, ",wsize=%d", fsopt->wsize);
|
|
if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
|
|
seq_printf(m, ",rsize=%d", fsopt->rsize);
|
|
if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
|
|
seq_printf(m, ",rasize=%d", fsopt->rasize);
|
|
if (fsopt->congestion_kb != default_congestion_kb())
|
|
seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
|
|
if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
|
|
seq_printf(m, ",caps_wanted_delay_min=%d",
|
|
fsopt->caps_wanted_delay_min);
|
|
if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
|
|
seq_printf(m, ",caps_wanted_delay_max=%d",
|
|
fsopt->caps_wanted_delay_max);
|
|
if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
|
|
seq_printf(m, ",cap_release_safety=%d",
|
|
fsopt->cap_release_safety);
|
|
if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
|
|
seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
|
|
if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
|
|
seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
|
|
if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
|
|
seq_show_option(m, "snapdirname", fsopt->snapdir_name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* handle any mon messages the standard library doesn't understand.
|
|
* return error if we don't either.
|
|
*/
|
|
static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
|
|
{
|
|
struct ceph_fs_client *fsc = client->private;
|
|
int type = le16_to_cpu(msg->hdr.type);
|
|
|
|
switch (type) {
|
|
case CEPH_MSG_MDS_MAP:
|
|
ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
|
|
return 0;
|
|
case CEPH_MSG_FS_MAP_USER:
|
|
ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
|
|
return 0;
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* create a new fs client
|
|
*/
|
|
static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
|
|
struct ceph_options *opt)
|
|
{
|
|
struct ceph_fs_client *fsc;
|
|
const u64 supported_features =
|
|
CEPH_FEATURE_FLOCK | CEPH_FEATURE_DIRLAYOUTHASH |
|
|
CEPH_FEATURE_MDSENC | CEPH_FEATURE_MDS_INLINE_DATA;
|
|
const u64 required_features = 0;
|
|
int page_count;
|
|
size_t size;
|
|
int err = -ENOMEM;
|
|
|
|
fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
|
|
if (!fsc)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
fsc->client = ceph_create_client(opt, fsc, supported_features,
|
|
required_features);
|
|
if (IS_ERR(fsc->client)) {
|
|
err = PTR_ERR(fsc->client);
|
|
goto fail;
|
|
}
|
|
fsc->client->extra_mon_dispatch = extra_mon_dispatch;
|
|
|
|
if (fsopt->mds_namespace == NULL) {
|
|
ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
|
|
0, true);
|
|
} else {
|
|
ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
|
|
0, false);
|
|
}
|
|
|
|
fsc->mount_options = fsopt;
|
|
|
|
fsc->sb = NULL;
|
|
fsc->mount_state = CEPH_MOUNT_MOUNTING;
|
|
|
|
atomic_long_set(&fsc->writeback_count, 0);
|
|
|
|
err = bdi_init(&fsc->backing_dev_info);
|
|
if (err < 0)
|
|
goto fail_client;
|
|
|
|
err = -ENOMEM;
|
|
/*
|
|
* The number of concurrent works can be high but they don't need
|
|
* to be processed in parallel, limit concurrency.
|
|
*/
|
|
fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
|
|
if (fsc->wb_wq == NULL)
|
|
goto fail_bdi;
|
|
fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
|
|
if (fsc->pg_inv_wq == NULL)
|
|
goto fail_wb_wq;
|
|
fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
|
|
if (fsc->trunc_wq == NULL)
|
|
goto fail_pg_inv_wq;
|
|
|
|
/* set up mempools */
|
|
err = -ENOMEM;
|
|
page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
|
|
size = sizeof (struct page *) * (page_count ? page_count : 1);
|
|
fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
|
|
if (!fsc->wb_pagevec_pool)
|
|
goto fail_trunc_wq;
|
|
|
|
/* setup fscache */
|
|
if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
|
|
(ceph_fscache_register_fs(fsc) != 0))
|
|
goto fail_fscache;
|
|
|
|
/* caps */
|
|
fsc->min_caps = fsopt->max_readdir;
|
|
|
|
return fsc;
|
|
|
|
fail_fscache:
|
|
ceph_fscache_unregister_fs(fsc);
|
|
fail_trunc_wq:
|
|
destroy_workqueue(fsc->trunc_wq);
|
|
fail_pg_inv_wq:
|
|
destroy_workqueue(fsc->pg_inv_wq);
|
|
fail_wb_wq:
|
|
destroy_workqueue(fsc->wb_wq);
|
|
fail_bdi:
|
|
bdi_destroy(&fsc->backing_dev_info);
|
|
fail_client:
|
|
ceph_destroy_client(fsc->client);
|
|
fail:
|
|
kfree(fsc);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static void destroy_fs_client(struct ceph_fs_client *fsc)
|
|
{
|
|
dout("destroy_fs_client %p\n", fsc);
|
|
|
|
ceph_fscache_unregister_fs(fsc);
|
|
|
|
destroy_workqueue(fsc->wb_wq);
|
|
destroy_workqueue(fsc->pg_inv_wq);
|
|
destroy_workqueue(fsc->trunc_wq);
|
|
|
|
bdi_destroy(&fsc->backing_dev_info);
|
|
|
|
mempool_destroy(fsc->wb_pagevec_pool);
|
|
|
|
destroy_mount_options(fsc->mount_options);
|
|
|
|
ceph_fs_debugfs_cleanup(fsc);
|
|
|
|
ceph_destroy_client(fsc->client);
|
|
|
|
kfree(fsc);
|
|
dout("destroy_fs_client %p done\n", fsc);
|
|
}
|
|
|
|
/*
|
|
* caches
|
|
*/
|
|
struct kmem_cache *ceph_inode_cachep;
|
|
struct kmem_cache *ceph_cap_cachep;
|
|
struct kmem_cache *ceph_cap_flush_cachep;
|
|
struct kmem_cache *ceph_dentry_cachep;
|
|
struct kmem_cache *ceph_file_cachep;
|
|
|
|
static void ceph_inode_init_once(void *foo)
|
|
{
|
|
struct ceph_inode_info *ci = foo;
|
|
inode_init_once(&ci->vfs_inode);
|
|
}
|
|
|
|
static int __init init_caches(void)
|
|
{
|
|
int error = -ENOMEM;
|
|
|
|
ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
|
|
sizeof(struct ceph_inode_info),
|
|
__alignof__(struct ceph_inode_info),
|
|
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
|
|
SLAB_ACCOUNT, ceph_inode_init_once);
|
|
if (ceph_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
|
|
ceph_cap_cachep = KMEM_CACHE(ceph_cap,
|
|
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
|
|
if (ceph_cap_cachep == NULL)
|
|
goto bad_cap;
|
|
ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
|
|
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
|
|
if (ceph_cap_flush_cachep == NULL)
|
|
goto bad_cap_flush;
|
|
|
|
ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
|
|
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
|
|
if (ceph_dentry_cachep == NULL)
|
|
goto bad_dentry;
|
|
|
|
ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
|
|
|
|
if (ceph_file_cachep == NULL)
|
|
goto bad_file;
|
|
|
|
if ((error = ceph_fscache_register()))
|
|
goto bad_file;
|
|
|
|
return 0;
|
|
bad_file:
|
|
kmem_cache_destroy(ceph_dentry_cachep);
|
|
bad_dentry:
|
|
kmem_cache_destroy(ceph_cap_flush_cachep);
|
|
bad_cap_flush:
|
|
kmem_cache_destroy(ceph_cap_cachep);
|
|
bad_cap:
|
|
kmem_cache_destroy(ceph_inode_cachep);
|
|
return error;
|
|
}
|
|
|
|
static void destroy_caches(void)
|
|
{
|
|
/*
|
|
* Make sure all delayed rcu free inodes are flushed before we
|
|
* destroy cache.
|
|
*/
|
|
rcu_barrier();
|
|
|
|
kmem_cache_destroy(ceph_inode_cachep);
|
|
kmem_cache_destroy(ceph_cap_cachep);
|
|
kmem_cache_destroy(ceph_cap_flush_cachep);
|
|
kmem_cache_destroy(ceph_dentry_cachep);
|
|
kmem_cache_destroy(ceph_file_cachep);
|
|
|
|
ceph_fscache_unregister();
|
|
}
|
|
|
|
|
|
/*
|
|
* ceph_umount_begin - initiate forced umount. Tear down down the
|
|
* mount, skipping steps that may hang while waiting for server(s).
|
|
*/
|
|
static void ceph_umount_begin(struct super_block *sb)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
|
|
|
|
dout("ceph_umount_begin - starting forced umount\n");
|
|
if (!fsc)
|
|
return;
|
|
fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
|
|
ceph_mdsc_force_umount(fsc->mdsc);
|
|
return;
|
|
}
|
|
|
|
static const struct super_operations ceph_super_ops = {
|
|
.alloc_inode = ceph_alloc_inode,
|
|
.destroy_inode = ceph_destroy_inode,
|
|
.write_inode = ceph_write_inode,
|
|
.drop_inode = ceph_drop_inode,
|
|
.evict_inode = ceph_evict_inode,
|
|
.sync_fs = ceph_sync_fs,
|
|
.put_super = ceph_put_super,
|
|
.show_options = ceph_show_options,
|
|
.statfs = ceph_statfs,
|
|
.umount_begin = ceph_umount_begin,
|
|
};
|
|
|
|
/*
|
|
* 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_fs_client *fsc,
|
|
const char *path,
|
|
unsigned long started)
|
|
{
|
|
struct ceph_mds_client *mdsc = fsc->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_CAST(req);
|
|
req->r_path1 = kstrdup(path, GFP_NOFS);
|
|
if (!req->r_path1) {
|
|
root = ERR_PTR(-ENOMEM);
|
|
goto out;
|
|
}
|
|
|
|
req->r_ino1.ino = CEPH_INO_ROOT;
|
|
req->r_ino1.snap = CEPH_NOSNAP;
|
|
req->r_started = started;
|
|
req->r_timeout = fsc->client->options->mount_timeout;
|
|
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) {
|
|
struct inode *inode = req->r_target_inode;
|
|
req->r_target_inode = NULL;
|
|
dout("open_root_inode success\n");
|
|
root = d_make_root(inode);
|
|
if (!root) {
|
|
root = ERR_PTR(-ENOMEM);
|
|
goto out;
|
|
}
|
|
ceph_init_dentry(root);
|
|
dout("open_root_inode success, root dentry is %p\n", root);
|
|
} else {
|
|
root = ERR_PTR(err);
|
|
}
|
|
out:
|
|
ceph_mdsc_put_request(req);
|
|
return root;
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
* mount: join the ceph cluster, and open root directory.
|
|
*/
|
|
static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
|
|
{
|
|
int err;
|
|
unsigned long started = jiffies; /* note the start time */
|
|
struct dentry *root;
|
|
int first = 0; /* first vfsmount for this super_block */
|
|
|
|
dout("mount start %p\n", fsc);
|
|
mutex_lock(&fsc->client->mount_mutex);
|
|
|
|
if (!fsc->sb->s_root) {
|
|
const char *path;
|
|
err = __ceph_open_session(fsc->client, started);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
if (!fsc->mount_options->server_path) {
|
|
path = "";
|
|
dout("mount opening path \\t\n");
|
|
} else {
|
|
path = fsc->mount_options->server_path + 1;
|
|
dout("mount opening path %s\n", path);
|
|
}
|
|
root = open_root_dentry(fsc, path, started);
|
|
if (IS_ERR(root)) {
|
|
err = PTR_ERR(root);
|
|
goto out;
|
|
}
|
|
fsc->sb->s_root = dget(root);
|
|
first = 1;
|
|
|
|
err = ceph_fs_debugfs_init(fsc);
|
|
if (err < 0)
|
|
goto fail;
|
|
} else {
|
|
root = dget(fsc->sb->s_root);
|
|
}
|
|
|
|
fsc->mount_state = CEPH_MOUNT_MOUNTED;
|
|
dout("mount success\n");
|
|
mutex_unlock(&fsc->client->mount_mutex);
|
|
return root;
|
|
|
|
fail:
|
|
if (first) {
|
|
dput(fsc->sb->s_root);
|
|
fsc->sb->s_root = NULL;
|
|
}
|
|
out:
|
|
mutex_unlock(&fsc->client->mount_mutex);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int ceph_set_super(struct super_block *s, void *data)
|
|
{
|
|
struct ceph_fs_client *fsc = data;
|
|
int ret;
|
|
|
|
dout("set_super %p data %p\n", s, data);
|
|
|
|
s->s_flags = fsc->mount_options->sb_flags;
|
|
s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
|
|
|
|
s->s_xattr = ceph_xattr_handlers;
|
|
s->s_fs_info = fsc;
|
|
fsc->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;
|
|
fsc->sb = NULL;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* share superblock if same fs AND options
|
|
*/
|
|
static int ceph_compare_super(struct super_block *sb, void *data)
|
|
{
|
|
struct ceph_fs_client *new = data;
|
|
struct ceph_mount_options *fsopt = new->mount_options;
|
|
struct ceph_options *opt = new->client->options;
|
|
struct ceph_fs_client *other = ceph_sb_to_client(sb);
|
|
|
|
dout("ceph_compare_super %p\n", sb);
|
|
|
|
if (compare_mount_options(fsopt, opt, other)) {
|
|
dout("monitor(s)/mount options don't match\n");
|
|
return 0;
|
|
}
|
|
if ((opt->flags & CEPH_OPT_FSID) &&
|
|
ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
|
|
dout("fsid doesn't match\n");
|
|
return 0;
|
|
}
|
|
if (fsopt->sb_flags != other->mount_options->sb_flags) {
|
|
dout("flags differ\n");
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* construct our own bdi so we can control readahead, etc.
|
|
*/
|
|
static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
|
|
|
|
static int ceph_register_bdi(struct super_block *sb,
|
|
struct ceph_fs_client *fsc)
|
|
{
|
|
int err;
|
|
|
|
/* set ra_pages based on rasize mount option? */
|
|
if (fsc->mount_options->rasize >= PAGE_SIZE)
|
|
fsc->backing_dev_info.ra_pages =
|
|
(fsc->mount_options->rasize + PAGE_SIZE - 1)
|
|
>> PAGE_SHIFT;
|
|
else
|
|
fsc->backing_dev_info.ra_pages =
|
|
VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
|
|
|
|
err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
|
|
atomic_long_inc_return(&bdi_seq));
|
|
if (!err)
|
|
sb->s_bdi = &fsc->backing_dev_info;
|
|
return err;
|
|
}
|
|
|
|
static struct dentry *ceph_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
struct super_block *sb;
|
|
struct ceph_fs_client *fsc;
|
|
struct dentry *res;
|
|
int err;
|
|
int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
|
|
struct ceph_mount_options *fsopt = NULL;
|
|
struct ceph_options *opt = NULL;
|
|
|
|
dout("ceph_mount\n");
|
|
|
|
#ifdef CONFIG_CEPH_FS_POSIX_ACL
|
|
flags |= MS_POSIXACL;
|
|
#endif
|
|
err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
|
|
if (err < 0) {
|
|
res = ERR_PTR(err);
|
|
goto out_final;
|
|
}
|
|
|
|
/* create client (which we may/may not use) */
|
|
fsc = create_fs_client(fsopt, opt);
|
|
if (IS_ERR(fsc)) {
|
|
res = ERR_CAST(fsc);
|
|
destroy_mount_options(fsopt);
|
|
ceph_destroy_options(opt);
|
|
goto out_final;
|
|
}
|
|
|
|
err = ceph_mdsc_init(fsc);
|
|
if (err < 0) {
|
|
res = ERR_PTR(err);
|
|
goto out;
|
|
}
|
|
|
|
if (ceph_test_opt(fsc->client, NOSHARE))
|
|
compare_super = NULL;
|
|
sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
|
|
if (IS_ERR(sb)) {
|
|
res = ERR_CAST(sb);
|
|
goto out;
|
|
}
|
|
|
|
if (ceph_sb_to_client(sb) != fsc) {
|
|
ceph_mdsc_destroy(fsc);
|
|
destroy_fs_client(fsc);
|
|
fsc = ceph_sb_to_client(sb);
|
|
dout("get_sb got existing client %p\n", fsc);
|
|
} else {
|
|
dout("get_sb using new client %p\n", fsc);
|
|
err = ceph_register_bdi(sb, fsc);
|
|
if (err < 0) {
|
|
res = ERR_PTR(err);
|
|
goto out_splat;
|
|
}
|
|
}
|
|
|
|
res = ceph_real_mount(fsc);
|
|
if (IS_ERR(res))
|
|
goto out_splat;
|
|
dout("root %p inode %p ino %llx.%llx\n", res,
|
|
d_inode(res), ceph_vinop(d_inode(res)));
|
|
return res;
|
|
|
|
out_splat:
|
|
ceph_mdsc_close_sessions(fsc->mdsc);
|
|
deactivate_locked_super(sb);
|
|
goto out_final;
|
|
|
|
out:
|
|
ceph_mdsc_destroy(fsc);
|
|
destroy_fs_client(fsc);
|
|
out_final:
|
|
dout("ceph_mount fail %ld\n", PTR_ERR(res));
|
|
return res;
|
|
}
|
|
|
|
static void ceph_kill_sb(struct super_block *s)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(s);
|
|
dev_t dev = s->s_dev;
|
|
|
|
dout("kill_sb %p\n", s);
|
|
|
|
ceph_mdsc_pre_umount(fsc->mdsc);
|
|
generic_shutdown_super(s);
|
|
ceph_mdsc_destroy(fsc);
|
|
|
|
destroy_fs_client(fsc);
|
|
free_anon_bdev(dev);
|
|
}
|
|
|
|
static struct file_system_type ceph_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ceph",
|
|
.mount = ceph_mount,
|
|
.kill_sb = ceph_kill_sb,
|
|
.fs_flags = FS_RENAME_DOES_D_MOVE,
|
|
};
|
|
MODULE_ALIAS_FS("ceph");
|
|
|
|
static int __init init_ceph(void)
|
|
{
|
|
int ret = init_caches();
|
|
if (ret)
|
|
goto out;
|
|
|
|
ceph_flock_init();
|
|
ceph_xattr_init();
|
|
ret = register_filesystem(&ceph_fs_type);
|
|
if (ret)
|
|
goto out_xattr;
|
|
|
|
pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
|
|
|
|
return 0;
|
|
|
|
out_xattr:
|
|
ceph_xattr_exit();
|
|
destroy_caches();
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit exit_ceph(void)
|
|
{
|
|
dout("exit_ceph\n");
|
|
unregister_filesystem(&ceph_fs_type);
|
|
ceph_xattr_exit();
|
|
destroy_caches();
|
|
}
|
|
|
|
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");
|