@@ -94,6 +94,7 @@
#include <linux/mutex.h>
#include <linux/genhd.h>
#include <linux/blkdev.h>
+#include <linux/rcustring.h>
#include "ctree.h"
#include "disk-io.h"
#include "hash.h"
@@ -103,7 +104,6 @@
#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
@@ -851,8 +851,8 @@ static int btrfsic_process_superblock_dev_mirror(
printk_in_rcu(KERN_INFO "New initial S-block (bdev %p, %s)"
" @%llu (%s/%llu/%d)\n",
superblock_bdev,
- rcu_str_deref(device->name), dev_bytenr,
- dev_state->name, dev_bytenr,
+ rcu_string_dereference(device->name),
+ dev_bytenr, dev_state->name, dev_bytenr,
superblock_mirror_num);
list_add(&superblock_tmp->all_blocks_node,
&state->all_blocks_list);
@@ -25,6 +25,7 @@
#include <linux/capability.h>
#include <linux/kthread.h>
#include <linux/math64.h>
+#include <linux/rcustring.h>
#include <asm/div64.h>
#include "ctree.h"
#include "extent_map.h"
@@ -34,7 +35,6 @@
#include "volumes.h"
#include "async-thread.h"
#include "check-integrity.h"
-#include "rcu-string.h"
#include "dev-replace.h"
#include "sysfs.h"
@@ -376,9 +376,9 @@ int btrfs_dev_replace_start(struct btrfs_root *root,
printk_in_rcu(KERN_INFO
"BTRFS: dev_replace from %s (devid %llu) to %s started\n",
src_device->missing ? "<missing disk>" :
- rcu_str_deref(src_device->name),
+ rcu_string_dereference(src_device->name),
src_device->devid,
- rcu_str_deref(tgt_device->name));
+ rcu_string_dereference(tgt_device->name));
tgt_device->total_bytes = src_device->total_bytes;
tgt_device->disk_total_bytes = src_device->disk_total_bytes;
@@ -528,9 +528,10 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
printk_in_rcu(KERN_ERR
"BTRFS: btrfs_scrub_dev(%s, %llu, %s) failed %d\n",
src_device->missing ? "<missing disk>" :
- rcu_str_deref(src_device->name),
+ rcu_string_dereference(src_device->name),
src_device->devid,
- rcu_str_deref(tgt_device->name), scrub_ret);
+ rcu_string_dereference(tgt_device->name),
+ scrub_ret);
btrfs_dev_replace_unlock(dev_replace);
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
mutex_unlock(&root->fs_info->chunk_mutex);
@@ -544,9 +545,9 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
printk_in_rcu(KERN_INFO
"BTRFS: dev_replace from %s (devid %llu) to %s) finished\n",
src_device->missing ? "<missing disk>" :
- rcu_str_deref(src_device->name),
+ rcu_string_dereference(src_device->name),
src_device->devid,
- rcu_str_deref(tgt_device->name));
+ rcu_string_dereference(tgt_device->name));
tgt_device->is_tgtdev_for_dev_replace = 0;
tgt_device->devid = src_device->devid;
src_device->devid = BTRFS_DEV_REPLACE_DEVID;
@@ -805,10 +806,10 @@ static int btrfs_dev_replace_kthread(void *data)
printk_in_rcu(KERN_INFO
"BTRFS: continuing dev_replace from %s (devid %llu) to %s @%u%%\n",
dev_replace->srcdev->missing ? "<missing disk>" :
- rcu_str_deref(dev_replace->srcdev->name),
+ rcu_string_dereference(dev_replace->srcdev->name),
dev_replace->srcdev->devid,
dev_replace->tgtdev ?
- rcu_str_deref(dev_replace->tgtdev->name) :
+ rcu_string_dereference(dev_replace->tgtdev->name) :
"<missing target disk>",
(unsigned int)progress);
}
@@ -31,6 +31,7 @@
#include <linux/ratelimit.h>
#include <linux/uuid.h>
#include <linux/semaphore.h>
+#include <linux/rcustring.h>
#include <asm/unaligned.h>
#include "ctree.h"
#include "disk-io.h"
@@ -44,7 +45,6 @@
#include "free-space-cache.h"
#include "inode-map.h"
#include "check-integrity.h"
-#include "rcu-string.h"
#include "dev-replace.h"
#include "raid56.h"
#include "sysfs.h"
@@ -3059,7 +3059,7 @@ static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
printk_ratelimited_in_rcu(KERN_WARNING "BTRFS: lost page write due to "
"I/O error on %s\n",
- rcu_str_deref(device->name));
+ rcu_string_dereference(device->name));
/* note, we dont' set_buffer_write_io_error because we have
* our own ways of dealing with the IO errors
*/
@@ -3247,7 +3247,7 @@ static int write_dev_flush(struct btrfs_device *device, int wait)
if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
printk_in_rcu("BTRFS: disabling barriers on dev %s\n",
- rcu_str_deref(device->name));
+ rcu_string_dereference(device->name));
device->nobarriers = 1;
} else if (!bio_flagged(bio, BIO_UPTODATE)) {
ret = -EIO;
@@ -11,6 +11,7 @@
#include <linux/pagevec.h>
#include <linux/prefetch.h>
#include <linux/cleancache.h>
+#include <linux/rcustring.h>
#include "extent_io.h"
#include "extent_map.h"
#include "ctree.h"
@@ -18,7 +19,6 @@
#include "volumes.h"
#include "check-integrity.h"
#include "locking.h"
-#include "rcu-string.h"
#include "backref.h"
static struct kmem_cache *extent_state_cache;
@@ -2065,7 +2065,7 @@ int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
printk_ratelimited_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);
+ start, rcu_string_dereference(dev->name), sector);
bio_put(bio);
return 0;
@@ -44,6 +44,7 @@
#include <linux/uuid.h>
#include <linux/btrfs.h>
#include <linux/uaccess.h>
+#include <linux/rcustring.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
@@ -53,7 +54,6 @@
#include "locking.h"
#include "inode-map.h"
#include "backref.h"
-#include "rcu-string.h"
#include "send.h"
#include "dev-replace.h"
#include "props.h"
@@ -1583,7 +1583,7 @@ static noinline int btrfs_ioctl_resize(struct file *file,
new_size *= root->sectorsize;
printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n",
- rcu_str_deref(device->name), new_size);
+ rcu_string_dereference(device->name), new_size);
if (new_size > old_size) {
trans = btrfs_start_transaction(root, 0);
@@ -32,6 +32,7 @@
#include <linux/list_sort.h>
#include <linux/raid/xor.h>
#include <linux/vmalloc.h>
+#include <linux/rcustring.h>
#include <asm/div64.h>
#include "ctree.h"
#include "extent_map.h"
@@ -42,7 +43,6 @@
#include "raid56.h"
#include "async-thread.h"
#include "check-integrity.h"
-#include "rcu-string.h"
/* set when additional merges to this rbio are not allowed */
#define RBIO_RMW_LOCKED_BIT 1
deleted file mode 100644
@@ -1,56 +0,0 @@
-/*
- * 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; \
-})
@@ -18,6 +18,7 @@
#include <linux/blkdev.h>
#include <linux/ratelimit.h>
+#include <linux/rcustring.h>
#include "ctree.h"
#include "volumes.h"
#include "disk-io.h"
@@ -27,7 +28,6 @@
#include "extent_io.h"
#include "dev-replace.h"
#include "check-integrity.h"
-#include "rcu-string.h"
#include "raid56.h"
/*
@@ -519,7 +519,8 @@ static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root,
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, rcu_str_deref(swarn->dev->name),
+ swarn->logical,
+ rcu_string_dereference(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]);
@@ -531,7 +532,7 @@ err:
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, rcu_str_deref(swarn->dev->name),
+ swarn->logical, rcu_string_dereference(swarn->dev->name),
(unsigned long long)swarn->sector, root, inum, offset, ret);
free_ipath(ipath);
@@ -595,7 +596,7 @@ static void scrub_print_warning(const char *errstr, struct scrub_block *sblock)
"BTRFS: %s at logical %llu on dev %s, "
"sector %llu: metadata %s (level %d) in tree "
"%llu\n", errstr, swarn.logical,
- rcu_str_deref(dev->name),
+ rcu_string_dereference(dev->name),
(unsigned long long)swarn.sector,
ref_level ? "node" : "leaf",
ret < 0 ? -1 : ref_level,
@@ -796,7 +797,7 @@ out:
num_uncorrectable_read_errors);
printk_ratelimited_in_rcu(KERN_ERR "BTRFS: "
"unable to fixup (nodatasum) error at logical %llu on dev %s\n",
- fixup->logical, rcu_str_deref(fixup->dev->name));
+ fixup->logical, rcu_string_dereference(fixup->dev->name));
}
btrfs_free_path(path);
@@ -1198,7 +1199,7 @@ corrected_error:
spin_unlock(&sctx->stat_lock);
printk_ratelimited_in_rcu(KERN_ERR
"BTRFS: fixed up error at logical %llu on dev %s\n",
- logical, rcu_str_deref(dev->name));
+ logical, rcu_string_dereference(dev->name));
}
} else {
did_not_correct_error:
@@ -1207,7 +1208,7 @@ did_not_correct_error:
spin_unlock(&sctx->stat_lock);
printk_ratelimited_in_rcu(KERN_ERR
"BTRFS: unable to fixup (regular) error at logical %llu on dev %s\n",
- logical, rcu_str_deref(dev->name));
+ logical, rcu_string_dereference(dev->name));
}
out:
@@ -42,6 +42,7 @@
#include <linux/cleancache.h>
#include <linux/ratelimit.h>
#include <linux/btrfs.h>
+#include <linux/rcustring.h>
#include "delayed-inode.h"
#include "ctree.h"
#include "disk-io.h"
@@ -54,7 +55,6 @@
#include "volumes.h"
#include "export.h"
#include "compression.h"
-#include "rcu-string.h"
#include "dev-replace.h"
#include "free-space-cache.h"
#include "backref.h"
@@ -27,6 +27,7 @@
#include <linux/kthread.h>
#include <linux/raid/pq.h>
#include <linux/semaphore.h>
+#include <linux/rcustring.h>
#include <asm/div64.h>
#include "ctree.h"
#include "extent_map.h"
@@ -37,7 +38,6 @@
#include "raid56.h"
#include "async-thread.h"
#include "check-integrity.h"
-#include "rcu-string.h"
#include "math.h"
#include "dev-replace.h"
#include "sysfs.h"
@@ -6322,7 +6322,7 @@ static int update_dev_stat_item(struct btrfs_trans_handle *trans,
if (ret < 0) {
printk_in_rcu(KERN_WARNING "BTRFS: "
"error %d while searching for dev_stats item for device %s!\n",
- ret, rcu_str_deref(device->name));
+ ret, rcu_string_dereference(device->name));
goto out;
}
@@ -6333,7 +6333,7 @@ static int update_dev_stat_item(struct btrfs_trans_handle *trans,
if (ret != 0) {
printk_in_rcu(KERN_WARNING "BTRFS: "
"delete too small dev_stats item for device %s failed %d!\n",
- rcu_str_deref(device->name), ret);
+ rcu_string_dereference(device->name), ret);
goto out;
}
ret = 1;
@@ -6346,8 +6346,8 @@ static int update_dev_stat_item(struct btrfs_trans_handle *trans,
&key, sizeof(*ptr));
if (ret < 0) {
printk_in_rcu(KERN_WARNING "BTRFS: "
- "insert dev_stats item for device %s failed %d!\n",
- rcu_str_deref(device->name), ret);
+ "insert dev_stats item for device %s failed %d!\n",
+ rcu_string_dereference(device->name), ret);
goto out;
}
}
@@ -6401,7 +6401,7 @@ static void btrfs_dev_stat_print_on_error(struct btrfs_device *dev)
return;
printk_ratelimited_in_rcu(KERN_ERR "BTRFS: "
"bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n",
- rcu_str_deref(dev->name),
+ rcu_string_dereference(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),
@@ -6421,7 +6421,7 @@ static void btrfs_dev_stat_print_on_load(struct btrfs_device *dev)
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),
+ rcu_string_dereference(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),
new file mode 100644
@@ -0,0 +1,89 @@
+/*
+ * RCU-friendly strings
+ *
+ * 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 as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, you can access it online at
+ * http://www.gnu.org/licenses/gpl-2.0.html.
+ */
+
+#ifndef _LINUX_RCUSTRING_H
+#define _LINUX_RCUSTRING_H
+
+struct rcu_string {
+ struct rcu_head rcu;
+ char str[0];
+};
+
+/**
+ * rcu_string_strdup() - create an RCU string from a string
+ * @src: The string to copy
+ * @flags: Flags for kmalloc
+ */
+static inline struct rcu_string __rcu *rcu_string_strdup(const char *src,
+ gfp_t flags)
+{
+ struct rcu_string *ret;
+ size_t len = strlen(src) + 1;
+
+ ret = kmalloc(sizeof(*ret) + (len * sizeof(char)), flags);
+ if (!ret)
+ return ret;
+ memcpy(ret->str, src, len);
+ return ret;
+}
+
+/**
+ * rcu_string_free() - free an RCU string
+ * @str: The string
+ */
+static inline void rcu_string_free(struct rcu_string __rcu *str)
+{
+ if (str)
+ kfree_rcu(str, rcu);
+}
+
+/*
+ * rcu_string_dereference() - dereference an RCU string
+ * @str: The string
+ *
+ * Like rcu_dereference, this must be done in an RCU critical section.
+ */
+static inline char *rcu_string_dereference(struct rcu_string __rcu *rcu_str)
+{
+ return rcu_dereference(rcu_str)->str;
+}
+
+/**
+ * printk_in_rcu() - printk in an RCU read-side critical section
+ */
+#define printk_in_rcu(fmt, ...) \
+ do { \
+ rcu_read_lock(); \
+ printk(fmt, __VA_ARGS__); \
+ rcu_read_unlock(); \
+ } while (0)
+
+/**
+ * printk_ratelimited_in_rcu() - printk_ratelimited in an RCU read-side critical
+ * section
+ */
+#define printk_ratelimited_in_rcu(fmt, ...) \
+ do { \
+ rcu_read_lock(); \
+ printk_ratelimited(fmt, __VA_ARGS__); \
+ rcu_read_unlock(); \
+ } while (0)
+
+#endif