linux-stable/fs/ceph/super.c

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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/ceph/ceph_debug.h>
#include <linux/backing-dev.h>
#include <linux/ctype.h>
#include <linux/fs.h>
#include <linux/inet.h>
#include <linux/in6.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.h>
#include <linux/statfs.h>
#include <linux/string.h>
#include "super.h"
#include "mds_client.h"
#include "cache.h"
#include <linux/ceph/ceph_features.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/mon_client.h>
#include <linux/ceph/auth.h>
#include <linux/ceph/debugfs.h>
static DEFINE_SPINLOCK(ceph_fsc_lock);
static LIST_HEAD(ceph_fsc_list);
/*
* Ceph superblock operations
*
* Handle the basics of mounting, unmounting.
*/
/*
* super ops
*/
static void ceph_put_super(struct super_block *s)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(s);
dout("put_super\n");
ceph_mdsc_close_sessions(fsc->mdsc);
}
static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
ceph: fix use-after-free in ceph_statfs() KASAN found an UAF in ceph_statfs. This was a one-off bug but looking at the code it looks like the monmap access needs to be protected as it can be modified while we're accessing it. Fix this by protecting the access with the monc->mutex. BUG: KASAN: use-after-free in ceph_statfs+0x21d/0x2c0 Read of size 8 at addr ffff88006844f2e0 by task trinity-c5/304 CPU: 0 PID: 304 Comm: trinity-c5 Not tainted 4.17.0-rc6+ #172 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014 Call Trace: dump_stack+0xa5/0x11b ? show_regs_print_info+0x5/0x5 ? kmsg_dump_rewind+0x118/0x118 ? ceph_statfs+0x21d/0x2c0 print_address_description+0x73/0x2b0 ? ceph_statfs+0x21d/0x2c0 kasan_report+0x243/0x360 ceph_statfs+0x21d/0x2c0 ? ceph_umount_begin+0x80/0x80 ? kmem_cache_alloc+0xdf/0x1a0 statfs_by_dentry+0x79/0xb0 vfs_statfs+0x28/0x110 user_statfs+0x8c/0xe0 ? vfs_statfs+0x110/0x110 ? __fdget_raw+0x10/0x10 __se_sys_statfs+0x5d/0xa0 ? user_statfs+0xe0/0xe0 ? mutex_unlock+0x1d/0x40 ? __x64_sys_statfs+0x20/0x30 do_syscall_64+0xee/0x290 ? syscall_return_slowpath+0x1c0/0x1c0 ? page_fault+0x1e/0x30 ? syscall_return_slowpath+0x13c/0x1c0 ? prepare_exit_to_usermode+0xdb/0x140 ? syscall_trace_enter+0x330/0x330 ? __put_user_4+0x1c/0x30 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Allocated by task 130: __kmalloc+0x124/0x210 ceph_monmap_decode+0x1c1/0x400 dispatch+0x113/0xd20 ceph_con_workfn+0xa7e/0x44e0 process_one_work+0x5f0/0xa30 worker_thread+0x184/0xa70 kthread+0x1a0/0x1c0 ret_from_fork+0x35/0x40 Freed by task 130: kfree+0xb8/0x210 dispatch+0x15a/0xd20 ceph_con_workfn+0xa7e/0x44e0 process_one_work+0x5f0/0xa30 worker_thread+0x184/0xa70 kthread+0x1a0/0x1c0 ret_from_fork+0x35/0x40 Signed-off-by: Luis Henriques <lhenriques@suse.com> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-05-28 17:37:40 +00:00
struct ceph_mon_client *monc = &fsc->client->monc;
struct ceph_statfs st;
u64 fsid;
int err;
u64 data_pool;
if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
} else {
data_pool = CEPH_NOPOOL;
}
dout("statfs\n");
ceph: fix use-after-free in ceph_statfs() KASAN found an UAF in ceph_statfs. This was a one-off bug but looking at the code it looks like the monmap access needs to be protected as it can be modified while we're accessing it. Fix this by protecting the access with the monc->mutex. BUG: KASAN: use-after-free in ceph_statfs+0x21d/0x2c0 Read of size 8 at addr ffff88006844f2e0 by task trinity-c5/304 CPU: 0 PID: 304 Comm: trinity-c5 Not tainted 4.17.0-rc6+ #172 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014 Call Trace: dump_stack+0xa5/0x11b ? show_regs_print_info+0x5/0x5 ? kmsg_dump_rewind+0x118/0x118 ? ceph_statfs+0x21d/0x2c0 print_address_description+0x73/0x2b0 ? ceph_statfs+0x21d/0x2c0 kasan_report+0x243/0x360 ceph_statfs+0x21d/0x2c0 ? ceph_umount_begin+0x80/0x80 ? kmem_cache_alloc+0xdf/0x1a0 statfs_by_dentry+0x79/0xb0 vfs_statfs+0x28/0x110 user_statfs+0x8c/0xe0 ? vfs_statfs+0x110/0x110 ? __fdget_raw+0x10/0x10 __se_sys_statfs+0x5d/0xa0 ? user_statfs+0xe0/0xe0 ? mutex_unlock+0x1d/0x40 ? __x64_sys_statfs+0x20/0x30 do_syscall_64+0xee/0x290 ? syscall_return_slowpath+0x1c0/0x1c0 ? page_fault+0x1e/0x30 ? syscall_return_slowpath+0x13c/0x1c0 ? prepare_exit_to_usermode+0xdb/0x140 ? syscall_trace_enter+0x330/0x330 ? __put_user_4+0x1c/0x30 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Allocated by task 130: __kmalloc+0x124/0x210 ceph_monmap_decode+0x1c1/0x400 dispatch+0x113/0xd20 ceph_con_workfn+0xa7e/0x44e0 process_one_work+0x5f0/0xa30 worker_thread+0x184/0xa70 kthread+0x1a0/0x1c0 ret_from_fork+0x35/0x40 Freed by task 130: kfree+0xb8/0x210 dispatch+0x15a/0xd20 ceph_con_workfn+0xa7e/0x44e0 process_one_work+0x5f0/0xa30 worker_thread+0x184/0xa70 kthread+0x1a0/0x1c0 ret_from_fork+0x35/0x40 Signed-off-by: Luis Henriques <lhenriques@suse.com> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-05-28 17:37:40 +00:00
err = ceph_monc_do_statfs(monc, data_pool, &st);
if (err < 0)
return err;
/* fill in kstatfs */
buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
/*
* express utilization in terms of large blocks to avoid
* overflow on 32-bit machines.
*
* NOTE: for the time being, we make bsize == frsize to humor
* not-yet-ancient versions of glibc that are broken.
* Someday, we will probably want to report a real block
* size... whatever that may mean for a network file system!
*/
buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
/*
* By default use root quota for stats; fallback to overall filesystem
* usage if using 'noquotadf' mount option or if the root dir doesn't
* have max_bytes quota set.
*/
if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
!ceph_quota_update_statfs(fsc, buf)) {
buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
}
buf->f_files = le64_to_cpu(st.num_objects);
buf->f_ffree = -1;
buf->f_namelen = NAME_MAX;
/* Must convert the fsid, for consistent values across arches */
ceph: fix use-after-free in ceph_statfs() KASAN found an UAF in ceph_statfs. This was a one-off bug but looking at the code it looks like the monmap access needs to be protected as it can be modified while we're accessing it. Fix this by protecting the access with the monc->mutex. BUG: KASAN: use-after-free in ceph_statfs+0x21d/0x2c0 Read of size 8 at addr ffff88006844f2e0 by task trinity-c5/304 CPU: 0 PID: 304 Comm: trinity-c5 Not tainted 4.17.0-rc6+ #172 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014 Call Trace: dump_stack+0xa5/0x11b ? show_regs_print_info+0x5/0x5 ? kmsg_dump_rewind+0x118/0x118 ? ceph_statfs+0x21d/0x2c0 print_address_description+0x73/0x2b0 ? ceph_statfs+0x21d/0x2c0 kasan_report+0x243/0x360 ceph_statfs+0x21d/0x2c0 ? ceph_umount_begin+0x80/0x80 ? kmem_cache_alloc+0xdf/0x1a0 statfs_by_dentry+0x79/0xb0 vfs_statfs+0x28/0x110 user_statfs+0x8c/0xe0 ? vfs_statfs+0x110/0x110 ? __fdget_raw+0x10/0x10 __se_sys_statfs+0x5d/0xa0 ? user_statfs+0xe0/0xe0 ? mutex_unlock+0x1d/0x40 ? __x64_sys_statfs+0x20/0x30 do_syscall_64+0xee/0x290 ? syscall_return_slowpath+0x1c0/0x1c0 ? page_fault+0x1e/0x30 ? syscall_return_slowpath+0x13c/0x1c0 ? prepare_exit_to_usermode+0xdb/0x140 ? syscall_trace_enter+0x330/0x330 ? __put_user_4+0x1c/0x30 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Allocated by task 130: __kmalloc+0x124/0x210 ceph_monmap_decode+0x1c1/0x400 dispatch+0x113/0xd20 ceph_con_workfn+0xa7e/0x44e0 process_one_work+0x5f0/0xa30 worker_thread+0x184/0xa70 kthread+0x1a0/0x1c0 ret_from_fork+0x35/0x40 Freed by task 130: kfree+0xb8/0x210 dispatch+0x15a/0xd20 ceph_con_workfn+0xa7e/0x44e0 process_one_work+0x5f0/0xa30 worker_thread+0x184/0xa70 kthread+0x1a0/0x1c0 ret_from_fork+0x35/0x40 Signed-off-by: Luis Henriques <lhenriques@suse.com> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-05-28 17:37:40 +00:00
mutex_lock(&monc->mutex);
fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
mutex_unlock(&monc->mutex);
buf->f_fsid.val[0] = fsid & 0xffffffff;
buf->f_fsid.val[1] = fsid >> 32;
return 0;
}
static int ceph_sync_fs(struct super_block *sb, int wait)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
if (!wait) {
dout("sync_fs (non-blocking)\n");
ceph_flush_dirty_caps(fsc->mdsc);
dout("sync_fs (non-blocking) done\n");
return 0;
}
dout("sync_fs (blocking)\n");
ceph_osdc_sync(&fsc->client->osdc);
ceph_mdsc_sync(fsc->mdsc);
dout("sync_fs (blocking) done\n");
return 0;
}
/*
* mount options
*/
enum {
Opt_wsize,
Opt_rsize,
Opt_rasize,
Opt_caps_wanted_delay_min,
Opt_caps_wanted_delay_max,
Opt_caps_max,
Opt_readdir_max_entries,
Opt_readdir_max_bytes,
Opt_congestion_kb,
/* int args above */
Opt_snapdirname,
Opt_mds_namespace,
Opt_recover_session,
Opt_source,
/* string args above */
Opt_dirstat,
Opt_rbytes,
Opt_asyncreaddir,
Opt_dcache,
Opt_ino32,
Opt_fscache,
Opt_poolperm,
Opt_require_active_mds,
Opt_acl,
Opt_quotadf,
Opt_copyfrom,
ceph: perform asynchronous unlink if we have sufficient caps The MDS is getting a new lock-caching facility that will allow it to cache the necessary locks to allow asynchronous directory operations. Since the CEPH_CAP_FILE_* caps are currently unused on directories, we can repurpose those bits for this purpose. When performing an unlink, if we have Fx on the parent directory, and CEPH_CAP_DIR_UNLINK (aka Fr), and we know that the dentry being removed is the primary link, then then we can fire off an unlink request immediately and don't need to wait on reply before returning. In that situation, just fix up the dcache and link count and return immediately after issuing the call to the MDS. This does mean that we need to hold an extra reference to the inode being unlinked, and extra references to the caps to avoid races. Those references are put and error handling is done in the r_callback routine. If the operation ends up failing, then set a writeback error on the directory inode, and the inode itself that can be fetched later by an fsync on the dir. The behavior of dir caps is slightly different from caps on normal files. Because these are just considered an optimization, if the session is reconnected, we will not automatically reclaim them. They are instead considered lost until we do another synchronous op in the parent directory. Async dirops are enabled via the "nowsync" mount option, which is patterned after the xfs "wsync" mount option. For now, the default is "wsync", but eventually we may flip that. Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2019-04-02 19:35:56 +00:00
Opt_wsync,
};
enum ceph_recover_session_mode {
ceph_recover_session_no,
ceph_recover_session_clean
};
static const struct constant_table ceph_param_recover[] = {
{ "no", ceph_recover_session_no },
{ "clean", ceph_recover_session_clean },
{}
};
static const struct fs_parameter_spec ceph_mount_parameters[] = {
fsparam_flag_no ("acl", Opt_acl),
fsparam_flag_no ("asyncreaddir", Opt_asyncreaddir),
fsparam_s32 ("caps_max", Opt_caps_max),
fsparam_u32 ("caps_wanted_delay_max", Opt_caps_wanted_delay_max),
fsparam_u32 ("caps_wanted_delay_min", Opt_caps_wanted_delay_min),
fsparam_u32 ("write_congestion_kb", Opt_congestion_kb),
fsparam_flag_no ("copyfrom", Opt_copyfrom),
fsparam_flag_no ("dcache", Opt_dcache),
fsparam_flag_no ("dirstat", Opt_dirstat),
fsparam_flag_no ("fsc", Opt_fscache), // fsc|nofsc
fsparam_string ("fsc", Opt_fscache), // fsc=...
fsparam_flag_no ("ino32", Opt_ino32),
fsparam_string ("mds_namespace", Opt_mds_namespace),
fsparam_flag_no ("poolperm", Opt_poolperm),
fsparam_flag_no ("quotadf", Opt_quotadf),
fsparam_u32 ("rasize", Opt_rasize),
fsparam_flag_no ("rbytes", Opt_rbytes),
fsparam_u32 ("readdir_max_bytes", Opt_readdir_max_bytes),
fsparam_u32 ("readdir_max_entries", Opt_readdir_max_entries),
fsparam_enum ("recover_session", Opt_recover_session, ceph_param_recover),
fsparam_flag_no ("require_active_mds", Opt_require_active_mds),
fsparam_u32 ("rsize", Opt_rsize),
fsparam_string ("snapdirname", Opt_snapdirname),
fsparam_string ("source", Opt_source),
fsparam_u32 ("wsize", Opt_wsize),
ceph: perform asynchronous unlink if we have sufficient caps The MDS is getting a new lock-caching facility that will allow it to cache the necessary locks to allow asynchronous directory operations. Since the CEPH_CAP_FILE_* caps are currently unused on directories, we can repurpose those bits for this purpose. When performing an unlink, if we have Fx on the parent directory, and CEPH_CAP_DIR_UNLINK (aka Fr), and we know that the dentry being removed is the primary link, then then we can fire off an unlink request immediately and don't need to wait on reply before returning. In that situation, just fix up the dcache and link count and return immediately after issuing the call to the MDS. This does mean that we need to hold an extra reference to the inode being unlinked, and extra references to the caps to avoid races. Those references are put and error handling is done in the r_callback routine. If the operation ends up failing, then set a writeback error on the directory inode, and the inode itself that can be fetched later by an fsync on the dir. The behavior of dir caps is slightly different from caps on normal files. Because these are just considered an optimization, if the session is reconnected, we will not automatically reclaim them. They are instead considered lost until we do another synchronous op in the parent directory. Async dirops are enabled via the "nowsync" mount option, which is patterned after the xfs "wsync" mount option. For now, the default is "wsync", but eventually we may flip that. Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2019-04-02 19:35:56 +00:00
fsparam_flag_no ("wsync", Opt_wsync),
{}
};
struct ceph_parse_opts_ctx {
struct ceph_options *copts;
struct ceph_mount_options *opts;
};
/*
* Remove adjacent slashes and then the trailing slash, unless it is
* the only remaining character.
*
* E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
*/
static void canonicalize_path(char *path)
{
int i, j = 0;
for (i = 0; path[i] != '\0'; i++) {
if (path[i] != '/' || j < 1 || path[j - 1] != '/')
path[j++] = path[i];
}
if (j > 1 && path[j - 1] == '/')
j--;
path[j] = '\0';
}
/*
* Parse the source parameter. Distinguish the server list from the path.
*
* The source will look like:
* <server_spec>[,<server_spec>...]:[<path>]
* where
* <server_spec> is <ip>[:<port>]
* <path> is optional, but if present must begin with '/'
*/
static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
{
struct ceph_parse_opts_ctx *pctx = fc->fs_private;
struct ceph_mount_options *fsopt = pctx->opts;
char *dev_name = param->string, *dev_name_end;
int ret;
dout("%s '%s'\n", __func__, dev_name);
if (!dev_name || !*dev_name)
return invalfc(fc, "Empty source");
dev_name_end = strchr(dev_name, '/');
if (dev_name_end) {
/*
* The server_path will include the whole chars from userland
* including the leading '/'.
*/
kfree(fsopt->server_path);
fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
if (!fsopt->server_path)
return -ENOMEM;
canonicalize_path(fsopt->server_path);
} else {
dev_name_end = dev_name + strlen(dev_name);
}
dev_name_end--; /* back up to ':' separator */
if (dev_name_end < dev_name || *dev_name_end != ':')
return invalfc(fc, "No path or : separator in source");
dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
if (fsopt->server_path)
dout("server path '%s'\n", fsopt->server_path);
ret = ceph_parse_mon_ips(param->string, dev_name_end - dev_name,
pctx->copts, fc->log.log);
if (ret)
return ret;
fc->source = param->string;
param->string = NULL;
return 0;
}
static int ceph_parse_mount_param(struct fs_context *fc,
struct fs_parameter *param)
{
struct ceph_parse_opts_ctx *pctx = fc->fs_private;
struct ceph_mount_options *fsopt = pctx->opts;
struct fs_parse_result result;
unsigned int mode;
int token, ret;
ret = ceph_parse_param(param, pctx->copts, fc->log.log);
if (ret != -ENOPARAM)
return ret;
token = fs_parse(fc, ceph_mount_parameters, param, &result);
dout("%s fs_parse '%s' token %d\n", __func__, param->key, token);
if (token < 0)
return token;
switch (token) {
case Opt_snapdirname:
kfree(fsopt->snapdir_name);
fsopt->snapdir_name = param->string;
param->string = NULL;
break;
case Opt_mds_namespace:
kfree(fsopt->mds_namespace);
fsopt->mds_namespace = param->string;
param->string = NULL;
break;
case Opt_recover_session:
mode = result.uint_32;
if (mode == ceph_recover_session_no)
fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
else if (mode == ceph_recover_session_clean)
fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
else
BUG();
break;
case Opt_source:
if (fc->source)
return invalfc(fc, "Multiple sources specified");
return ceph_parse_source(param, fc);
case Opt_wsize:
if (result.uint_32 < PAGE_SIZE ||
result.uint_32 > CEPH_MAX_WRITE_SIZE)
goto out_of_range;
fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
break;
case Opt_rsize:
if (result.uint_32 < PAGE_SIZE ||
result.uint_32 > CEPH_MAX_READ_SIZE)
goto out_of_range;
fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
break;
case Opt_rasize:
fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
break;
case Opt_caps_wanted_delay_min:
if (result.uint_32 < 1)
goto out_of_range;
fsopt->caps_wanted_delay_min = result.uint_32;
break;
case Opt_caps_wanted_delay_max:
if (result.uint_32 < 1)
goto out_of_range;
fsopt->caps_wanted_delay_max = result.uint_32;
break;
case Opt_caps_max:
if (result.int_32 < 0)
goto out_of_range;
fsopt->caps_max = result.int_32;
break;
case Opt_readdir_max_entries:
if (result.uint_32 < 1)
goto out_of_range;
fsopt->max_readdir = result.uint_32;
break;
case Opt_readdir_max_bytes:
if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
goto out_of_range;
fsopt->max_readdir_bytes = result.uint_32;
break;
case Opt_congestion_kb:
if (result.uint_32 < 1024) /* at least 1M */
goto out_of_range;
fsopt->congestion_kb = result.uint_32;
break;
case Opt_dirstat:
if (!result.negated)
fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
else
fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
break;
case Opt_rbytes:
if (!result.negated)
fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
else
fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
break;
case Opt_asyncreaddir:
if (!result.negated)
fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
else
fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
break;
case Opt_dcache:
if (!result.negated)
fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
else
fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
break;
case Opt_ino32:
if (!result.negated)
fsopt->flags |= CEPH_MOUNT_OPT_INO32;
else
fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
break;
case Opt_fscache:
#ifdef CONFIG_CEPH_FSCACHE
kfree(fsopt->fscache_uniq);
fsopt->fscache_uniq = NULL;
if (result.negated) {
fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
} else {
fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
fsopt->fscache_uniq = param->string;
param->string = NULL;
}
break;
#else
return invalfc(fc, "fscache support is disabled");
#endif
case Opt_poolperm:
if (!result.negated)
fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
else
fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
break;
case Opt_require_active_mds:
if (!result.negated)
fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
else
fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
break;
case Opt_quotadf:
if (!result.negated)
fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
else
fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
break;
case Opt_copyfrom:
if (!result.negated)
fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
else
fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
break;
case Opt_acl:
if (!result.negated) {
#ifdef CONFIG_CEPH_FS_POSIX_ACL
fc->sb_flags |= SB_POSIXACL;
#else
return invalfc(fc, "POSIX ACL support is disabled");
#endif
} else {
fc->sb_flags &= ~SB_POSIXACL;
}
break;
ceph: perform asynchronous unlink if we have sufficient caps The MDS is getting a new lock-caching facility that will allow it to cache the necessary locks to allow asynchronous directory operations. Since the CEPH_CAP_FILE_* caps are currently unused on directories, we can repurpose those bits for this purpose. When performing an unlink, if we have Fx on the parent directory, and CEPH_CAP_DIR_UNLINK (aka Fr), and we know that the dentry being removed is the primary link, then then we can fire off an unlink request immediately and don't need to wait on reply before returning. In that situation, just fix up the dcache and link count and return immediately after issuing the call to the MDS. This does mean that we need to hold an extra reference to the inode being unlinked, and extra references to the caps to avoid races. Those references are put and error handling is done in the r_callback routine. If the operation ends up failing, then set a writeback error on the directory inode, and the inode itself that can be fetched later by an fsync on the dir. The behavior of dir caps is slightly different from caps on normal files. Because these are just considered an optimization, if the session is reconnected, we will not automatically reclaim them. They are instead considered lost until we do another synchronous op in the parent directory. Async dirops are enabled via the "nowsync" mount option, which is patterned after the xfs "wsync" mount option. For now, the default is "wsync", but eventually we may flip that. Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2019-04-02 19:35:56 +00:00
case Opt_wsync:
if (!result.negated)
fsopt->flags &= ~CEPH_MOUNT_OPT_ASYNC_DIROPS;
else
fsopt->flags |= CEPH_MOUNT_OPT_ASYNC_DIROPS;
break;
default:
BUG();
}
return 0;
out_of_range:
return invalfc(fc, "%s out of range", param->key);
}
static void destroy_mount_options(struct ceph_mount_options *args)
{
dout("destroy_mount_options %p\n", args);
if (!args)
return;
kfree(args->snapdir_name);
kfree(args->mds_namespace);
kfree(args->server_path);
kfree(args->fscache_uniq);
kfree(args);
}
static int strcmp_null(const char *s1, const char *s2)
{
if (!s1 && !s2)
return 0;
if (s1 && !s2)
return -1;
if (!s1 && s2)
return 1;
return strcmp(s1, s2);
}
static int compare_mount_options(struct ceph_mount_options *new_fsopt,
struct ceph_options *new_opt,
struct ceph_fs_client *fsc)
{
struct ceph_mount_options *fsopt1 = new_fsopt;
struct ceph_mount_options *fsopt2 = fsc->mount_options;
int ofs = offsetof(struct ceph_mount_options, snapdir_name);
int ret;
ret = memcmp(fsopt1, fsopt2, ofs);
if (ret)
return ret;
ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
if (ret)
return ret;
ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
if (ret)
return ret;
ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
if (ret)
return ret;
ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
if (ret)
return ret;
return ceph_compare_options(new_opt, fsc->client);
}
/**
* ceph_show_options - Show mount options in /proc/mounts
* @m: seq_file to write to
* @root: root of that (sub)tree
*/
static int ceph_show_options(struct seq_file *m, struct dentry *root)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
struct ceph_mount_options *fsopt = fsc->mount_options;
size_t pos;
int ret;
/* a comma between MNT/MS and client options */
seq_putc(m, ',');
pos = m->count;
ret = ceph_print_client_options(m, fsc->client, false);
if (ret)
return ret;
/* retract our comma if no client options */
if (m->count == pos)
m->count--;
if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
seq_puts(m, ",dirstat");
if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
seq_puts(m, ",rbytes");
if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
seq_puts(m, ",noasyncreaddir");
if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
seq_puts(m, ",nodcache");
if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
seq_puts(m, ",ino32");
if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
seq_show_option(m, "fsc", fsopt->fscache_uniq);
}
if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
seq_puts(m, ",nopoolperm");
if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
seq_puts(m, ",noquotadf");
#ifdef CONFIG_CEPH_FS_POSIX_ACL
if (root->d_sb->s_flags & SB_POSIXACL)
seq_puts(m, ",acl");
else
seq_puts(m, ",noacl");
#endif
if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
seq_puts(m, ",copyfrom");
if (fsopt->mds_namespace)
seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
seq_show_option(m, "recover_session", "clean");
ceph: perform asynchronous unlink if we have sufficient caps The MDS is getting a new lock-caching facility that will allow it to cache the necessary locks to allow asynchronous directory operations. Since the CEPH_CAP_FILE_* caps are currently unused on directories, we can repurpose those bits for this purpose. When performing an unlink, if we have Fx on the parent directory, and CEPH_CAP_DIR_UNLINK (aka Fr), and we know that the dentry being removed is the primary link, then then we can fire off an unlink request immediately and don't need to wait on reply before returning. In that situation, just fix up the dcache and link count and return immediately after issuing the call to the MDS. This does mean that we need to hold an extra reference to the inode being unlinked, and extra references to the caps to avoid races. Those references are put and error handling is done in the r_callback routine. If the operation ends up failing, then set a writeback error on the directory inode, and the inode itself that can be fetched later by an fsync on the dir. The behavior of dir caps is slightly different from caps on normal files. Because these are just considered an optimization, if the session is reconnected, we will not automatically reclaim them. They are instead considered lost until we do another synchronous op in the parent directory. Async dirops are enabled via the "nowsync" mount option, which is patterned after the xfs "wsync" mount option. For now, the default is "wsync", but eventually we may flip that. Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2019-04-02 19:35:56 +00:00
if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
seq_puts(m, ",nowsync");
if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
seq_printf(m, ",wsize=%u", fsopt->wsize);
if (fsopt->rsize != CEPH_MAX_READ_SIZE)
seq_printf(m, ",rsize=%u", fsopt->rsize);
if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
seq_printf(m, ",rasize=%u", fsopt->rasize);
if (fsopt->congestion_kb != default_congestion_kb())
seq_printf(m, ",write_congestion_kb=%u", fsopt->congestion_kb);
if (fsopt->caps_max)
seq_printf(m, ",caps_max=%d", fsopt->caps_max);
if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
seq_printf(m, ",caps_wanted_delay_min=%u",
fsopt->caps_wanted_delay_min);
if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
seq_printf(m, ",caps_wanted_delay_max=%u",
fsopt->caps_wanted_delay_max);
if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
seq_printf(m, ",readdir_max_entries=%u", fsopt->max_readdir);
if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
seq_printf(m, ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
fs: create and use seq_show_option for escaping Many file systems that implement the show_options hook fail to correctly escape their output which could lead to unescaped characters (e.g. new lines) leaking into /proc/mounts and /proc/[pid]/mountinfo files. This could lead to confusion, spoofed entries (resulting in things like systemd issuing false d-bus "mount" notifications), and who knows what else. This looks like it would only be the root user stepping on themselves, but it's possible weird things could happen in containers or in other situations with delegated mount privileges. Here's an example using overlay with setuid fusermount trusting the contents of /proc/mounts (via the /etc/mtab symlink). Imagine the use of "sudo" is something more sneaky: $ BASE="ovl" $ MNT="$BASE/mnt" $ LOW="$BASE/lower" $ UP="$BASE/upper" $ WORK="$BASE/work/ 0 0 none /proc fuse.pwn user_id=1000" $ mkdir -p "$LOW" "$UP" "$WORK" $ sudo mount -t overlay -o "lowerdir=$LOW,upperdir=$UP,workdir=$WORK" none /mnt $ cat /proc/mounts none /root/ovl/mnt overlay rw,relatime,lowerdir=ovl/lower,upperdir=ovl/upper,workdir=ovl/work/ 0 0 none /proc fuse.pwn user_id=1000 0 0 $ fusermount -u /proc $ cat /proc/mounts cat: /proc/mounts: No such file or directory This fixes the problem by adding new seq_show_option and seq_show_option_n helpers, and updating the vulnerable show_option handlers to use them as needed. Some, like SELinux, need to be open coded due to unusual existing escape mechanisms. [akpm@linux-foundation.org: add lost chunk, per Kees] [keescook@chromium.org: seq_show_option should be using const parameters] Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Acked-by: Jan Kara <jack@suse.com> Acked-by: Paul Moore <paul@paul-moore.com> Cc: J. R. Okajima <hooanon05g@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-09-04 22:44:57 +00:00
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
*
* Success or not, this function consumes @fsopt and @opt.
*/
static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
struct ceph_options *opt)
{
struct ceph_fs_client *fsc;
int err;
fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
if (!fsc) {
err = -ENOMEM;
goto fail;
}
fsc->client = ceph_create_client(opt, fsc);
if (IS_ERR(fsc->client)) {
err = PTR_ERR(fsc->client);
goto fail;
}
opt = NULL; /* fsc->client now owns this */
fsc->client->extra_mon_dispatch = extra_mon_dispatch;
ceph_set_opt(fsc->client, ABORT_ON_FULL);
if (!fsopt->mds_namespace) {
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;
fsc->filp_gen = 1;
fsc->have_copy_from2 = true;
atomic_long_set(&fsc->writeback_count, 0);
err = -ENOMEM;
/*
* The number of concurrent works can be high but they don't need
* to be processed in parallel, limit concurrency.
*/
fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
if (!fsc->inode_wq)
goto fail_client;
fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
if (!fsc->cap_wq)
goto fail_inode_wq;
spin_lock(&ceph_fsc_lock);
list_add_tail(&fsc->metric_wakeup, &ceph_fsc_list);
spin_unlock(&ceph_fsc_lock);
return fsc;
fail_inode_wq:
destroy_workqueue(fsc->inode_wq);
fail_client:
ceph_destroy_client(fsc->client);
fail:
kfree(fsc);
if (opt)
ceph_destroy_options(opt);
destroy_mount_options(fsopt);
return ERR_PTR(err);
}
static void flush_fs_workqueues(struct ceph_fs_client *fsc)
{
flush_workqueue(fsc->inode_wq);
flush_workqueue(fsc->cap_wq);
}
static void destroy_fs_client(struct ceph_fs_client *fsc)
{
dout("destroy_fs_client %p\n", fsc);
spin_lock(&ceph_fsc_lock);
list_del(&fsc->metric_wakeup);
spin_unlock(&ceph_fsc_lock);
ceph_mdsc_destroy(fsc);
destroy_workqueue(fsc->inode_wq);
destroy_workqueue(fsc->cap_wq);
destroy_mount_options(fsc->mount_options);
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;
struct kmem_cache *ceph_dir_file_cachep;
struct kmem_cache *ceph_mds_request_cachep;
mempool_t *ceph_wb_pagevec_pool;
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),
2016-01-14 23:18:21 +00:00
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
SLAB_ACCOUNT, ceph_inode_init_once);
if (!ceph_inode_cachep)
return -ENOMEM;
ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
if (!ceph_cap_cachep)
goto bad_cap;
ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
if (!ceph_cap_flush_cachep)
goto bad_cap_flush;
ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
if (!ceph_dentry_cachep)
goto bad_dentry;
ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
if (!ceph_file_cachep)
goto bad_file;
ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
if (!ceph_dir_file_cachep)
goto bad_dir_file;
ceph_mds_request_cachep = KMEM_CACHE(ceph_mds_request, SLAB_MEM_SPREAD);
if (!ceph_mds_request_cachep)
goto bad_mds_req;
ceph_wb_pagevec_pool = mempool_create_kmalloc_pool(10, CEPH_MAX_WRITE_SIZE >> PAGE_SHIFT);
if (!ceph_wb_pagevec_pool)
goto bad_pagevec_pool;
error = ceph_fscache_register();
if (error)
goto bad_fscache;
return 0;
bad_fscache:
kmem_cache_destroy(ceph_mds_request_cachep);
bad_pagevec_pool:
mempool_destroy(ceph_wb_pagevec_pool);
bad_mds_req:
kmem_cache_destroy(ceph_dir_file_cachep);
bad_dir_file:
kmem_cache_destroy(ceph_file_cachep);
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);
kmem_cache_destroy(ceph_dir_file_cachep);
kmem_cache_destroy(ceph_mds_request_cachep);
mempool_destroy(ceph_wb_pagevec_pool);
ceph_fscache_unregister();
}
/*
* ceph_umount_begin - initiate forced umount. Tear 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_osdc_abort_requests(&fsc->client->osdc, -EIO);
ceph_mdsc_force_umount(fsc->mdsc);
fsc->filp_gen++; // invalidate open files
}
static const struct super_operations ceph_super_ops = {
.alloc_inode = ceph_alloc_inode,
.free_inode = ceph_free_inode,
.write_inode = ceph_write_inode,
.drop_inode = generic_delete_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;
}
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,
struct fs_context *fc)
{
int err;
unsigned long started = jiffies; /* note the start time */
struct dentry *root;
dout("mount start %p\n", fsc);
mutex_lock(&fsc->client->mount_mutex);
if (!fsc->sb->s_root) {
const char *path = fsc->mount_options->server_path ?
fsc->mount_options->server_path + 1 : "";
err = __ceph_open_session(fsc->client, started);
if (err < 0)
goto out;
/* setup fscache */
if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
err = ceph_fscache_register_fs(fsc, fc);
if (err < 0)
goto out;
}
dout("mount opening path '%s'\n", path);
ceph_fs_debugfs_init(fsc);
root = open_root_dentry(fsc, path, started);
if (IS_ERR(root)) {
err = PTR_ERR(root);
goto out;
}
fsc->sb->s_root = dget(root);
} 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;
out:
mutex_unlock(&fsc->client->mount_mutex);
return ERR_PTR(err);
}
static int ceph_set_super(struct super_block *s, struct fs_context *fc)
{
struct ceph_fs_client *fsc = s->s_fs_info;
int ret;
dout("set_super %p\n", s);
s->s_maxbytes = MAX_LFS_FILESIZE;
s->s_xattr = ceph_xattr_handlers;
fsc->sb = s;
fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
s->s_op = &ceph_super_ops;
s->s_d_op = &ceph_dentry_ops;
s->s_export_op = &ceph_export_ops;
s->s_time_gran = 1;
s->s_time_min = 0;
s->s_time_max = U32_MAX;
ret = set_anon_super_fc(s, fc);
if (ret != 0)
fsc->sb = NULL;
return ret;
}
/*
* share superblock if same fs AND options
*/
static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
{
struct ceph_fs_client *new = fc->s_fs_info;
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 (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
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_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
{
int err;
err = super_setup_bdi_name(sb, "ceph-%ld",
atomic_long_inc_return(&bdi_seq));
if (err)
return err;
/* set ra_pages based on rasize mount option? */
sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
/* set io_pages based on max osd read size */
sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
return 0;
}
static int ceph_get_tree(struct fs_context *fc)
{
struct ceph_parse_opts_ctx *pctx = fc->fs_private;
struct super_block *sb;
struct ceph_fs_client *fsc;
struct dentry *res;
int (*compare_super)(struct super_block *, struct fs_context *) =
ceph_compare_super;
int err;
dout("ceph_get_tree\n");
if (!fc->source)
return invalfc(fc, "No source");
/* create client (which we may/may not use) */
fsc = create_fs_client(pctx->opts, pctx->copts);
pctx->opts = NULL;
pctx->copts = NULL;
if (IS_ERR(fsc)) {
err = PTR_ERR(fsc);
goto out_final;
}
err = ceph_mdsc_init(fsc);
if (err < 0)
goto out;
if (ceph_test_opt(fsc->client, NOSHARE))
compare_super = NULL;
fc->s_fs_info = fsc;
sb = sget_fc(fc, compare_super, ceph_set_super);
fc->s_fs_info = NULL;
if (IS_ERR(sb)) {
err = PTR_ERR(sb);
goto out;
}
if (ceph_sb_to_client(sb) != 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_setup_bdi(sb, fsc);
if (err < 0)
goto out_splat;
}
res = ceph_real_mount(fsc, fc);
if (IS_ERR(res)) {
err = PTR_ERR(res);
goto out_splat;
}
dout("root %p inode %p ino %llx.%llx\n", res,
d_inode(res), ceph_vinop(d_inode(res)));
fc->root = fsc->sb->s_root;
return 0;
out_splat:
if (!ceph_mdsmap_is_cluster_available(fsc->mdsc->mdsmap)) {
pr_info("No mds server is up or the cluster is laggy\n");
err = -EHOSTUNREACH;
}
ceph_mdsc_close_sessions(fsc->mdsc);
deactivate_locked_super(sb);
goto out_final;
out:
destroy_fs_client(fsc);
out_final:
dout("ceph_get_tree fail %d\n", err);
return err;
}
static void ceph_free_fc(struct fs_context *fc)
{
struct ceph_parse_opts_ctx *pctx = fc->fs_private;
if (pctx) {
destroy_mount_options(pctx->opts);
ceph_destroy_options(pctx->copts);
kfree(pctx);
}
}
static int ceph_reconfigure_fc(struct fs_context *fc)
{
ceph: perform asynchronous unlink if we have sufficient caps The MDS is getting a new lock-caching facility that will allow it to cache the necessary locks to allow asynchronous directory operations. Since the CEPH_CAP_FILE_* caps are currently unused on directories, we can repurpose those bits for this purpose. When performing an unlink, if we have Fx on the parent directory, and CEPH_CAP_DIR_UNLINK (aka Fr), and we know that the dentry being removed is the primary link, then then we can fire off an unlink request immediately and don't need to wait on reply before returning. In that situation, just fix up the dcache and link count and return immediately after issuing the call to the MDS. This does mean that we need to hold an extra reference to the inode being unlinked, and extra references to the caps to avoid races. Those references are put and error handling is done in the r_callback routine. If the operation ends up failing, then set a writeback error on the directory inode, and the inode itself that can be fetched later by an fsync on the dir. The behavior of dir caps is slightly different from caps on normal files. Because these are just considered an optimization, if the session is reconnected, we will not automatically reclaim them. They are instead considered lost until we do another synchronous op in the parent directory. Async dirops are enabled via the "nowsync" mount option, which is patterned after the xfs "wsync" mount option. For now, the default is "wsync", but eventually we may flip that. Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2019-04-02 19:35:56 +00:00
struct ceph_parse_opts_ctx *pctx = fc->fs_private;
struct ceph_mount_options *fsopt = pctx->opts;
struct ceph_fs_client *fsc = ceph_sb_to_client(fc->root->d_sb);
if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
ceph_set_mount_opt(fsc, ASYNC_DIROPS);
else
ceph_clear_mount_opt(fsc, ASYNC_DIROPS);
sync_filesystem(fc->root->d_sb);
return 0;
}
static const struct fs_context_operations ceph_context_ops = {
.free = ceph_free_fc,
.parse_param = ceph_parse_mount_param,
.get_tree = ceph_get_tree,
.reconfigure = ceph_reconfigure_fc,
};
/*
* Set up the filesystem mount context.
*/
static int ceph_init_fs_context(struct fs_context *fc)
{
struct ceph_parse_opts_ctx *pctx;
struct ceph_mount_options *fsopt;
pctx = kzalloc(sizeof(*pctx), GFP_KERNEL);
if (!pctx)
return -ENOMEM;
pctx->copts = ceph_alloc_options();
if (!pctx->copts)
goto nomem;
pctx->opts = kzalloc(sizeof(*pctx->opts), GFP_KERNEL);
if (!pctx->opts)
goto nomem;
fsopt = pctx->opts;
fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
fsopt->wsize = CEPH_MAX_WRITE_SIZE;
fsopt->rsize = CEPH_MAX_READ_SIZE;
fsopt->rasize = CEPH_RASIZE_DEFAULT;
fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
if (!fsopt->snapdir_name)
goto nomem;
fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
fsopt->congestion_kb = default_congestion_kb();
#ifdef CONFIG_CEPH_FS_POSIX_ACL
fc->sb_flags |= SB_POSIXACL;
#endif
fc->fs_private = pctx;
fc->ops = &ceph_context_ops;
return 0;
nomem:
destroy_mount_options(pctx->opts);
ceph_destroy_options(pctx->copts);
kfree(pctx);
return -ENOMEM;
}
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);
flush_fs_workqueues(fsc);
generic_shutdown_super(s);
fsc->client->extra_mon_dispatch = NULL;
ceph_fs_debugfs_cleanup(fsc);
ceph_fscache_unregister_fs(fsc);
destroy_fs_client(fsc);
free_anon_bdev(dev);
}
static struct file_system_type ceph_fs_type = {
.owner = THIS_MODULE,
.name = "ceph",
.init_fs_context = ceph_init_fs_context,
.kill_sb = ceph_kill_sb,
.fs_flags = FS_RENAME_DOES_D_MOVE,
};
fs: Limit sys_mount to only request filesystem modules. Modify the request_module to prefix the file system type with "fs-" and add aliases to all of the filesystems that can be built as modules to match. A common practice is to build all of the kernel code and leave code that is not commonly needed as modules, with the result that many users are exposed to any bug anywhere in the kernel. Looking for filesystems with a fs- prefix limits the pool of possible modules that can be loaded by mount to just filesystems trivially making things safer with no real cost. Using aliases means user space can control the policy of which filesystem modules are auto-loaded by editing /etc/modprobe.d/*.conf with blacklist and alias directives. Allowing simple, safe, well understood work-arounds to known problematic software. This also addresses a rare but unfortunate problem where the filesystem name is not the same as it's module name and module auto-loading would not work. While writing this patch I saw a handful of such cases. The most significant being autofs that lives in the module autofs4. This is relevant to user namespaces because we can reach the request module in get_fs_type() without having any special permissions, and people get uncomfortable when a user specified string (in this case the filesystem type) goes all of the way to request_module. After having looked at this issue I don't think there is any particular reason to perform any filtering or permission checks beyond making it clear in the module request that we want a filesystem module. The common pattern in the kernel is to call request_module() without regards to the users permissions. In general all a filesystem module does once loaded is call register_filesystem() and go to sleep. Which means there is not much attack surface exposed by loading a filesytem module unless the filesystem is mounted. In a user namespace filesystems are not mounted unless .fs_flags = FS_USERNS_MOUNT, which most filesystems do not set today. Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Acked-by: Kees Cook <keescook@chromium.org> Reported-by: Kees Cook <keescook@google.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2013-03-03 03:39:14 +00:00
MODULE_ALIAS_FS("ceph");
int ceph_force_reconnect(struct super_block *sb)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
int err = 0;
ceph_umount_begin(sb);
/* Make sure all page caches get invalidated.
* see remove_session_caps_cb() */
flush_workqueue(fsc->inode_wq);
/* In case that we were blacklisted. This also reset
* all mon/osd connections */
ceph_reset_client_addr(fsc->client);
ceph_osdc_clear_abort_err(&fsc->client->osdc);
fsc->blacklisted = false;
fsc->mount_state = CEPH_MOUNT_MOUNTED;
if (sb->s_root) {
err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
CEPH_STAT_CAP_INODE, true);
}
return err;
}
static int __init init_ceph(void)
{
int ret = init_caches();
if (ret)
goto out;
ceph_flock_init();
ret = register_filesystem(&ceph_fs_type);
if (ret)
goto out_caches;
pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
return 0;
out_caches:
destroy_caches();
out:
return ret;
}
static void __exit exit_ceph(void)
{
dout("exit_ceph\n");
unregister_filesystem(&ceph_fs_type);
destroy_caches();
}
static int param_set_metrics(const char *val, const struct kernel_param *kp)
{
struct ceph_fs_client *fsc;
int ret;
ret = param_set_bool(val, kp);
if (ret) {
pr_err("Failed to parse sending metrics switch value '%s'\n",
val);
return ret;
} else if (!disable_send_metrics) {
// wake up all the mds clients
spin_lock(&ceph_fsc_lock);
list_for_each_entry(fsc, &ceph_fsc_list, metric_wakeup) {
metric_schedule_delayed(&fsc->mdsc->metric);
}
spin_unlock(&ceph_fsc_lock);
}
return 0;
}
static const struct kernel_param_ops param_ops_metrics = {
.set = param_set_metrics,
.get = param_get_bool,
};
bool disable_send_metrics = false;
module_param_cb(disable_send_metrics, &param_ops_metrics, &disable_send_metrics, 0644);
MODULE_PARM_DESC(disable_send_metrics, "Enable sending perf metrics to ceph cluster (default: on)");
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");