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Btrfs: use rcu to protect device->name 

Al pointed out that we can just toss out the old name on a device and add a
new one arbitrarily, so anybody who uses device->name in printk could
possibly use free'd memory.  Instead of adding locking around all of this he
suggested doing it with RCU, so I've introduced a struct rcu_string that
does just that and have gone through and protected all accesses to
device->name that aren't under the uuid_mutex with rcu_read_lock().  This
protects us and I will use it for dealing with removing the device that we
used to mount the file system in a later patch.  Thanks,

Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik 2012-06-04 14:03:51 -04:00 committed by Chris Mason
parent 17ca04aff7
commit 606686eeac
8 changed files with 162 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
fs/btrfs/check-integrity.c
View File

@ -93,6 +93,7 @@
#include "print-tree.h"
#include "locking.h"
#include "check-integrity.h"
#include "rcu-string.h"
#define BTRFSIC_BLOCK_HASHTABLE_SIZE 0x10000
#define BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE 0x10000
@ -843,13 +844,14 @@ static int btrfsic_process_superblock_dev_mirror(
superblock_tmp->never_written = 0;
superblock_tmp->mirror_num = 1 + superblock_mirror_num;
if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE)
printk(KERN_INFO "New initial S-block (bdev %p, %s)"
" @%llu (%s/%llu/%d)\n",
superblock_bdev, device->name,
(unsigned long long)dev_bytenr,
dev_state->name,
(unsigned long long)dev_bytenr,
superblock_mirror_num);
printk_in_rcu(KERN_INFO "New initial S-block (bdev %p, %s)"
" @%llu (%s/%llu/%d)\n",
superblock_bdev,
rcu_str_deref(device->name),
(unsigned long long)dev_bytenr,
dev_state->name,
(unsigned long long)dev_bytenr,
superblock_mirror_num);
list_add(&superblock_tmp->all_blocks_node,
&state->all_blocks_list);
btrfsic_block_hashtable_add(superblock_tmp,

10
fs/btrfs/disk-io.c
View File

@ -44,6 +44,7 @@
#include "free-space-cache.h"
#include "inode-map.h"
#include "check-integrity.h"
#include "rcu-string.h"
static struct extent_io_ops btree_extent_io_ops;
static void end_workqueue_fn(struct btrfs_work *work);
@ -2575,8 +2576,9 @@ static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
struct btrfs_device *device = (struct btrfs_device *)
bh->b_private;
printk_ratelimited(KERN_WARNING "lost page write due to "
"I/O error on %s\n", device->name);
printk_ratelimited_in_rcu(KERN_WARNING "lost page write due to "
"I/O error on %s\n",
rcu_str_deref(device->name));
/* note, we dont' set_buffer_write_io_error because we have
* our own ways of dealing with the IO errors
*/
@ -2749,8 +2751,8 @@ static int write_dev_flush(struct btrfs_device *device, int wait)
wait_for_completion(&device->flush_wait);
if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
printk("btrfs: disabling barriers on dev %s\n",
device->name);
printk_in_rcu("btrfs: disabling barriers on dev %s\n",
rcu_str_deref(device->name));
device->nobarriers = 1;
}
if (!bio_flagged(bio, BIO_UPTODATE)) {

7
fs/btrfs/extent_io.c
View File

@ -20,6 +20,7 @@
#include "volumes.h"
#include "check-integrity.h"
#include "locking.h"
#include "rcu-string.h"
static struct kmem_cache *extent_state_cache;
static struct kmem_cache *extent_buffer_cache;
@ -1917,9 +1918,9 @@ int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
return -EIO;
}
printk(KERN_INFO "btrfs read error corrected: ino %lu off %llu (dev %s "
"sector %llu)\n", page->mapping->host->i_ino, start,
dev->name, sector);
printk_in_rcu(KERN_INFO "btrfs read error corrected: ino %lu off %llu "
"(dev %s sector %llu)\n", page->mapping->host->i_ino,
start, rcu_str_deref(dev->name), sector);
bio_put(bio);
return 0;

13
fs/btrfs/ioctl.c
View File

@ -52,6 +52,7 @@
#include "locking.h"
#include "inode-map.h"
#include "backref.h"
#include "rcu-string.h"
/* Mask out flags that are inappropriate for the given type of inode. */
static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
@ -1345,8 +1346,9 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
do_div(new_size, root->sectorsize);
new_size *= root->sectorsize;
printk(KERN_INFO "btrfs: new size for %s is %llu\n",
device->name, (unsigned long long)new_size);
printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n",
rcu_str_deref(device->name),
(unsigned long long)new_size);
if (new_size > old_size) {
trans = btrfs_start_transaction(root, 0);
@ -2264,7 +2266,12 @@ static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
di_args->total_bytes = dev->total_bytes;
memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
if (dev->name) {
strncpy(di_args->path, dev->name, sizeof(di_args->path));
struct rcu_string *name;
rcu_read_lock();
name = rcu_dereference(dev->name);
strncpy(di_args->path, name->str, sizeof(di_args->path));
rcu_read_unlock();
di_args->path[sizeof(di_args->path) - 1] = 0;
} else {
di_args->path[0] = '\0';

56
fs/btrfs/rcu-string.h Normal file
View File

@ -0,0 +1,56 @@
/*
* Copyright (C) 2012 Red Hat. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
struct rcu_string {
struct rcu_head rcu;
char str[0];
};
static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask)
{
size_t len = strlen(src) + 1;
struct rcu_string *ret = kzalloc(sizeof(struct rcu_string) +
(len * sizeof(char)), mask);
if (!ret)
return ret;
strncpy(ret->str, src, len);
return ret;
}
static inline void rcu_string_free(struct rcu_string *str)
{
if (str)
kfree_rcu(str, rcu);
}
#define printk_in_rcu(fmt, ...) do { \
rcu_read_lock(); \
printk(fmt, __VA_ARGS__); \
rcu_read_unlock(); \
} while (0)
#define printk_ratelimited_in_rcu(fmt, ...) do { \
rcu_read_lock(); \
printk_ratelimited(fmt, __VA_ARGS__); \
rcu_read_unlock(); \
} while (0)
#define rcu_str_deref(rcu_str) ({ \
struct rcu_string *__str = rcu_dereference(rcu_str); \
__str->str; \
})

30
fs/btrfs/scrub.c
View File

@ -26,6 +26,7 @@
#include "backref.h"
#include "extent_io.h"
#include "check-integrity.h"
#include "rcu-string.h"
/*
* This is only the first step towards a full-features scrub. It reads all
@ -320,10 +321,10 @@ static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, void *ctx)
* hold all of the paths here
*/
for (i = 0; i < ipath->fspath->elem_cnt; ++i)
printk(KERN_WARNING "btrfs: %s at logical %llu on dev "
printk_in_rcu(KERN_WARNING "btrfs: %s at logical %llu on dev "
"%s, sector %llu, root %llu, inode %llu, offset %llu, "
"length %llu, links %u (path: %s)\n", swarn->errstr,
swarn->logical, swarn->dev->name,
swarn->logical, rcu_str_deref(swarn->dev->name),
(unsigned long long)swarn->sector, root, inum, offset,
min(isize - offset, (u64)PAGE_SIZE), nlink,
(char *)(unsigned long)ipath->fspath->val[i]);
@ -332,10 +333,10 @@ static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, void *ctx)
return 0;
err:
printk(KERN_WARNING "btrfs: %s at logical %llu on dev "
printk_in_rcu(KERN_WARNING "btrfs: %s at logical %llu on dev "
"%s, sector %llu, root %llu, inode %llu, offset %llu: path "
"resolving failed with ret=%d\n", swarn->errstr,
swarn->logical, swarn->dev->name,
swarn->logical, rcu_str_deref(swarn->dev->name),
(unsigned long long)swarn->sector, root, inum, offset, ret);
free_ipath(ipath);
@ -390,10 +391,11 @@ static void scrub_print_warning(const char *errstr, struct scrub_block *sblock)
do {
ret = tree_backref_for_extent(&ptr, eb, ei, item_size,
&ref_root, &ref_level);
printk(KERN_WARNING
printk_in_rcu(KERN_WARNING
"btrfs: %s at logical %llu on dev %s, "
"sector %llu: metadata %s (level %d) in tree "
"%llu\n", errstr, swarn.logical, dev->name,
"%llu\n", errstr, swarn.logical,
rcu_str_deref(dev->name),
(unsigned long long)swarn.sector,
ref_level ? "node" : "leaf",
ret < 0 ? -1 : ref_level,
@ -580,9 +582,11 @@ static void scrub_fixup_nodatasum(struct btrfs_work *work)
spin_lock(&sdev->stat_lock);
++sdev->stat.uncorrectable_errors;
spin_unlock(&sdev->stat_lock);
printk_ratelimited(KERN_ERR
printk_ratelimited_in_rcu(KERN_ERR
"btrfs: unable to fixup (nodatasum) error at logical %llu on dev %s\n",
(unsigned long long)fixup->logical, sdev->dev->name);
(unsigned long long)fixup->logical,
rcu_str_deref(sdev->dev->name));
}
btrfs_free_path(path);
@ -936,18 +940,20 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
spin_lock(&sdev->stat_lock);
sdev->stat.corrected_errors++;
spin_unlock(&sdev->stat_lock);
printk_ratelimited(KERN_ERR
printk_ratelimited_in_rcu(KERN_ERR
"btrfs: fixed up error at logical %llu on dev %s\n",
(unsigned long long)logical, sdev->dev->name);
(unsigned long long)logical,
rcu_str_deref(sdev->dev->name));
}
} else {
did_not_correct_error:
spin_lock(&sdev->stat_lock);
sdev->stat.uncorrectable_errors++;
spin_unlock(&sdev->stat_lock);
printk_ratelimited(KERN_ERR
printk_ratelimited_in_rcu(KERN_ERR
"btrfs: unable to fixup (regular) error at logical %llu on dev %s\n",
(unsigned long long)logical, sdev->dev->name);
(unsigned long long)logical,
rcu_str_deref(sdev->dev->name));
}
out:

92
fs/btrfs/volumes.c
View File

@ -35,6 +35,7 @@
#include "volumes.h"
#include "async-thread.h"
#include "check-integrity.h"
#include "rcu-string.h"
static int init_first_rw_device(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
@ -64,7 +65,7 @@ static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
device = list_entry(fs_devices->devices.next,
struct btrfs_device, dev_list);
list_del(&device->dev_list);
kfree(device->name);
rcu_string_free(device->name);
kfree(device);
}
kfree(fs_devices);
@ -334,8 +335,8 @@ static noinline int device_list_add(const char *path,
{
struct btrfs_device *device;
struct btrfs_fs_devices *fs_devices;
struct rcu_string *name;
u64 found_transid = btrfs_super_generation(disk_super);
char *name;
fs_devices = find_fsid(disk_super->fsid);
if (!fs_devices) {
@ -369,11 +370,13 @@ static noinline int device_list_add(const char *path,
memcpy(device->uuid, disk_super->dev_item.uuid,
BTRFS_UUID_SIZE);
spin_lock_init(&device->io_lock);
device->name = kstrdup(path, GFP_NOFS);
if (!device->name) {
name = rcu_string_strdup(path, GFP_NOFS);
if (!name) {
kfree(device);
return -ENOMEM;
}
rcu_assign_pointer(device->name, name);
INIT_LIST_HEAD(&device->dev_alloc_list);
/* init readahead state */
@ -390,12 +393,12 @@ static noinline int device_list_add(const char *path,
device->fs_devices = fs_devices;
fs_devices->num_devices++;
} else if (!device->name || strcmp(device->name, path)) {
name = kstrdup(path, GFP_NOFS);
} else if (!device->name || strcmp(device->name->str, path)) {
name = rcu_string_strdup(path, GFP_NOFS);
if (!name)
return -ENOMEM;
kfree(device->name);
device->name = name;
rcu_string_free(device->name);
rcu_assign_pointer(device->name, name);
if (device->missing) {
fs_devices->missing_devices--;
device->missing = 0;
@ -430,15 +433,22 @@ static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig)
/* We have held the volume lock, it is safe to get the devices. */
list_for_each_entry(orig_dev, &orig->devices, dev_list) {
struct rcu_string *name;
device = kzalloc(sizeof(*device), GFP_NOFS);
if (!device)
goto error;
device->name = kstrdup(orig_dev->name, GFP_NOFS);
if (!device->name) {
/*
* This is ok to do without rcu read locked because we hold the
* uuid mutex so nothing we touch in here is going to disappear.
*/
name = rcu_string_strdup(orig_dev->name->str, GFP_NOFS);
if (!name) {
kfree(device);
goto error;
}
rcu_assign_pointer(device->name, name);
device->devid = orig_dev->devid;
device->work.func = pending_bios_fn;
@ -491,7 +501,7 @@ void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices)
}
list_del_init(&device->dev_list);
fs_devices->num_devices--;
kfree(device->name);
rcu_string_free(device->name);
kfree(device);
}
@ -516,7 +526,7 @@ static void __free_device(struct work_struct *work)
if (device->bdev)
blkdev_put(device->bdev, device->mode);
kfree(device->name);
rcu_string_free(device->name);
kfree(device);
}
@ -540,6 +550,7 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
mutex_lock(&fs_devices->device_list_mutex);
list_for_each_entry(device, &fs_devices->devices, dev_list) {
struct btrfs_device *new_device;
struct rcu_string *name;
if (device->bdev)
fs_devices->open_devices--;
@ -555,8 +566,11 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
new_device = kmalloc(sizeof(*new_device), GFP_NOFS);
BUG_ON(!new_device); /* -ENOMEM */
memcpy(new_device, device, sizeof(*new_device));
new_device->name = kstrdup(device->name, GFP_NOFS);
BUG_ON(device->name && !new_device->name); /* -ENOMEM */
/* Safe because we are under uuid_mutex */
name = rcu_string_strdup(device->name->str, GFP_NOFS);
BUG_ON(device->name && !name); /* -ENOMEM */
rcu_assign_pointer(new_device->name, name);
new_device->bdev = NULL;
new_device->writeable = 0;
new_device->in_fs_metadata = 0;
@ -621,9 +635,9 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
if (!device->name)
continue;
bdev = blkdev_get_by_path(device->name, flags, holder);
bdev = blkdev_get_by_path(device->name->str, flags, holder);
if (IS_ERR(bdev)) {
printk(KERN_INFO "open %s failed\n", device->name);
printk(KERN_INFO "open %s failed\n", device->name->str);
goto error;
}
filemap_write_and_wait(bdev->bd_inode->i_mapping);
@ -1632,6 +1646,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
struct block_device *bdev;
struct list_head *devices;
struct super_block *sb = root->fs_info->sb;
struct rcu_string *name;
u64 total_bytes;
int seeding_dev = 0;
int ret = 0;
@ -1671,23 +1686,24 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
goto error;
}
device->name = kstrdup(device_path, GFP_NOFS);
if (!device->name) {
name = rcu_string_strdup(device_path, GFP_NOFS);
if (!name) {
kfree(device);
ret = -ENOMEM;
goto error;
}
rcu_assign_pointer(device->name, name);
ret = find_next_devid(root, &device->devid);
if (ret) {
kfree(device->name);
rcu_string_free(device->name);
kfree(device);
goto error;
}
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans)) {
kfree(device->name);
rcu_string_free(device->name);
kfree(device);
ret = PTR_ERR(trans);
goto error;
@ -1796,7 +1812,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
unlock_chunks(root);
btrfs_abort_transaction(trans, root, ret);
btrfs_end_transaction(trans, root);
kfree(device->name);
rcu_string_free(device->name);
kfree(device);
error:
blkdev_put(bdev, FMODE_EXCL);
@ -4204,10 +4220,17 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
bio->bi_sector = bbio->stripes[dev_nr].physical >> 9;
dev = bbio->stripes[dev_nr].dev;
if (dev && dev->bdev && (rw != WRITE || dev->writeable)) {
#ifdef DEBUG
struct rcu_string *name;
rcu_read_lock();
name = rcu_dereference(dev->name);
pr_debug("btrfs_map_bio: rw %d, secor=%llu, dev=%lu "
"(%s id %llu), size=%u\n", rw,
(u64)bio->bi_sector, (u_long)dev->bdev->bd_dev,
dev->name, dev->devid, bio->bi_size);
name->str, dev->devid, bio->bi_size);
rcu_read_unlock();
#endif
bio->bi_bdev = dev->bdev;
if (async_submit)
schedule_bio(root, dev, rw, bio);
@ -4694,8 +4717,9 @@ int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info)
key.offset = device->devid;
ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0);
if (ret) {
printk(KERN_WARNING "btrfs: no dev_stats entry found for device %s (devid %llu) (OK on first mount after mkfs)\n",
device->name, (unsigned long long)device->devid);
printk_in_rcu(KERN_WARNING "btrfs: no dev_stats entry found for device %s (devid %llu) (OK on first mount after mkfs)\n",
rcu_str_deref(device->name),
(unsigned long long)device->devid);
__btrfs_reset_dev_stats(device);
device->dev_stats_valid = 1;
btrfs_release_path(path);
@ -4747,8 +4771,8 @@ static int update_dev_stat_item(struct btrfs_trans_handle *trans,
BUG_ON(!path);
ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1);
if (ret < 0) {
printk(KERN_WARNING "btrfs: error %d while searching for dev_stats item for device %s!\n",
ret, device->name);
printk_in_rcu(KERN_WARNING "btrfs: error %d while searching for dev_stats item for device %s!\n",
ret, rcu_str_deref(device->name));
goto out;
}
@ -4757,8 +4781,8 @@ static int update_dev_stat_item(struct btrfs_trans_handle *trans,
/* need to delete old one and insert a new one */
ret = btrfs_del_item(trans, dev_root, path);
if (ret != 0) {
printk(KERN_WARNING "btrfs: delete too small dev_stats item for device %s failed %d!\n",
device->name, ret);
printk_in_rcu(KERN_WARNING "btrfs: delete too small dev_stats item for device %s failed %d!\n",
rcu_str_deref(device->name), ret);
goto out;
}
ret = 1;
@ -4770,8 +4794,8 @@ static int update_dev_stat_item(struct btrfs_trans_handle *trans,
ret = btrfs_insert_empty_item(trans, dev_root, path,
&key, sizeof(*ptr));
if (ret < 0) {
printk(KERN_WARNING "btrfs: insert dev_stats item for device %s failed %d!\n",
device->name, ret);
printk_in_rcu(KERN_WARNING "btrfs: insert dev_stats item for device %s failed %d!\n",
rcu_str_deref(device->name), ret);
goto out;
}
}
@ -4823,9 +4847,9 @@ void btrfs_dev_stat_print_on_error(struct btrfs_device *dev)
{
if (!dev->dev_stats_valid)
return;
printk_ratelimited(KERN_ERR
printk_ratelimited_in_rcu(KERN_ERR
"btrfs: bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n",
dev->name,
rcu_str_deref(dev->name),
btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS),
btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS),
btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS),
@ -4837,8 +4861,8 @@ void btrfs_dev_stat_print_on_error(struct btrfs_device *dev)
static void btrfs_dev_stat_print_on_load(struct btrfs_device *dev)
{
printk(KERN_INFO "btrfs: bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n",
dev->name,
printk_in_rcu(KERN_INFO "btrfs: bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n",
rcu_str_deref(dev->name),
btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS),
btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS),
btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS),

2
fs/btrfs/volumes.h
View File

@ -58,7 +58,7 @@ struct btrfs_device {
/* the mode sent to blkdev_get */
fmode_t mode;
char *name;
struct rcu_string *name;
/* the internal btrfs device id */
u64 devid;