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-rw-r--r--fs/btrfs/super.c115
1 files changed, 62 insertions, 53 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 81107ad49f3a..6601c9aa5e35 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -5,7 +5,6 @@
#include <linux/blkdev.h>
#include <linux/module.h>
-#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
@@ -15,8 +14,6 @@
#include <linux/string.h>
#include <linux/backing-dev.h>
#include <linux/mount.h>
-#include <linux/mpage.h>
-#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/statfs.h>
#include <linux/compat.h>
@@ -468,9 +465,8 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
case Opt_subvolrootid:
case Opt_device:
/*
- * These are parsed by btrfs_parse_subvol_options
- * and btrfs_parse_early_options
- * and can be happily ignored here.
+ * These are parsed by btrfs_parse_subvol_options or
+ * btrfs_parse_device_options and can be ignored here.
*/
break;
case Opt_nodatasum:
@@ -760,6 +756,7 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
case Opt_recovery:
btrfs_warn(info,
"'recovery' is deprecated, use 'usebackuproot' instead");
+ /* fall through */
case Opt_usebackuproot:
btrfs_info(info,
"trying to use backup root at mount time");
@@ -885,13 +882,16 @@ out:
* All other options will be parsed on much later in the mount process and
* only when we need to allocate a new super block.
*/
-static int btrfs_parse_early_options(const char *options, fmode_t flags,
- void *holder, struct btrfs_fs_devices **fs_devices)
+static int btrfs_parse_device_options(const char *options, fmode_t flags,
+ void *holder)
{
substring_t args[MAX_OPT_ARGS];
char *device_name, *opts, *orig, *p;
+ struct btrfs_device *device = NULL;
int error = 0;
+ lockdep_assert_held(&uuid_mutex);
+
if (!options)
return 0;
@@ -917,11 +917,13 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags,
error = -ENOMEM;
goto out;
}
- error = btrfs_scan_one_device(device_name,
- flags, holder, fs_devices);
+ device = btrfs_scan_one_device(device_name, flags,
+ holder);
kfree(device_name);
- if (error)
+ if (IS_ERR(device)) {
+ error = PTR_ERR(device);
goto out;
+ }
}
}
@@ -935,8 +937,8 @@ out:
*
* The value is later passed to mount_subvol()
*/
-static int btrfs_parse_subvol_options(const char *options, fmode_t flags,
- char **subvol_name, u64 *subvol_objectid)
+static int btrfs_parse_subvol_options(const char *options, char **subvol_name,
+ u64 *subvol_objectid)
{
substring_t args[MAX_OPT_ARGS];
char *opts, *orig, *p;
@@ -948,7 +950,7 @@ static int btrfs_parse_subvol_options(const char *options, fmode_t flags,
/*
* strsep changes the string, duplicate it because
- * btrfs_parse_early_options gets called later
+ * btrfs_parse_device_options gets called later
*/
opts = kstrdup(options, GFP_KERNEL);
if (!opts)
@@ -1517,6 +1519,7 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
{
struct block_device *bdev = NULL;
struct super_block *s;
+ struct btrfs_device *device = NULL;
struct btrfs_fs_devices *fs_devices = NULL;
struct btrfs_fs_info *fs_info = NULL;
struct security_mnt_opts new_sec_opts;
@@ -1526,12 +1529,6 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
if (!(flags & SB_RDONLY))
mode |= FMODE_WRITE;
- error = btrfs_parse_early_options(data, mode, fs_type,
- &fs_devices);
- if (error) {
- return ERR_PTR(error);
- }
-
security_init_mnt_opts(&new_sec_opts);
if (data) {
error = parse_security_options(data, &new_sec_opts);
@@ -1539,10 +1536,6 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
return ERR_PTR(error);
}
- error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices);
- if (error)
- goto error_sec_opts;
-
/*
* Setup a dummy root and fs_info for test/set super. This is because
* we don't actually fill this stuff out until open_ctree, but we need
@@ -1555,8 +1548,6 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
goto error_sec_opts;
}
- fs_info->fs_devices = fs_devices;
-
fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
security_init_mnt_opts(&fs_info->security_opts);
@@ -1565,7 +1556,25 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
goto error_fs_info;
}
+ mutex_lock(&uuid_mutex);
+ error = btrfs_parse_device_options(data, mode, fs_type);
+ if (error) {
+ mutex_unlock(&uuid_mutex);
+ goto error_fs_info;
+ }
+
+ device = btrfs_scan_one_device(device_name, mode, fs_type);
+ if (IS_ERR(device)) {
+ mutex_unlock(&uuid_mutex);
+ error = PTR_ERR(device);
+ goto error_fs_info;
+ }
+
+ fs_devices = device->fs_devices;
+ fs_info->fs_devices = fs_devices;
+
error = btrfs_open_devices(fs_devices, mode, fs_type);
+ mutex_unlock(&uuid_mutex);
if (error)
goto error_fs_info;
@@ -1650,8 +1659,8 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
if (!(flags & SB_RDONLY))
mode |= FMODE_WRITE;
- error = btrfs_parse_subvol_options(data, mode,
- &subvol_name, &subvol_objectid);
+ error = btrfs_parse_subvol_options(data, &subvol_name,
+ &subvol_objectid);
if (error) {
kfree(subvol_name);
return ERR_PTR(error);
@@ -2098,14 +2107,9 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
btrfs_account_ro_block_groups_free_space(found);
for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
- if (!list_empty(&found->block_groups[i])) {
- switch (i) {
- case BTRFS_RAID_DUP:
- case BTRFS_RAID_RAID1:
- case BTRFS_RAID_RAID10:
- factor = 2;
- }
- }
+ if (!list_empty(&found->block_groups[i]))
+ factor = btrfs_bg_type_to_factor(
+ btrfs_raid_array[i].bg_flag);
}
}
@@ -2222,7 +2226,7 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct btrfs_ioctl_vol_args *vol;
- struct btrfs_fs_devices *fs_devices;
+ struct btrfs_device *device = NULL;
int ret = -ENOTTY;
if (!capable(CAP_SYS_ADMIN))
@@ -2234,15 +2238,24 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
switch (cmd) {
case BTRFS_IOC_SCAN_DEV:
- ret = btrfs_scan_one_device(vol->name, FMODE_READ,
- &btrfs_root_fs_type, &fs_devices);
+ mutex_lock(&uuid_mutex);
+ device = btrfs_scan_one_device(vol->name, FMODE_READ,
+ &btrfs_root_fs_type);
+ ret = PTR_ERR_OR_ZERO(device);
+ mutex_unlock(&uuid_mutex);
break;
case BTRFS_IOC_DEVICES_READY:
- ret = btrfs_scan_one_device(vol->name, FMODE_READ,
- &btrfs_root_fs_type, &fs_devices);
- if (ret)
+ mutex_lock(&uuid_mutex);
+ device = btrfs_scan_one_device(vol->name, FMODE_READ,
+ &btrfs_root_fs_type);
+ if (IS_ERR(device)) {
+ mutex_unlock(&uuid_mutex);
+ ret = PTR_ERR(device);
break;
- ret = !(fs_devices->num_devices == fs_devices->total_devices);
+ }
+ ret = !(device->fs_devices->num_devices ==
+ device->fs_devices->total_devices);
+ mutex_unlock(&uuid_mutex);
break;
case BTRFS_IOC_GET_SUPPORTED_FEATURES:
ret = btrfs_ioctl_get_supported_features((void __user*)arg);
@@ -2290,7 +2303,6 @@ static int btrfs_show_devname(struct seq_file *m, struct dentry *root)
struct btrfs_fs_devices *cur_devices;
struct btrfs_device *dev, *first_dev = NULL;
struct list_head *head;
- struct rcu_string *name;
/*
* Lightweight locking of the devices. We should not need
@@ -2314,12 +2326,10 @@ static int btrfs_show_devname(struct seq_file *m, struct dentry *root)
cur_devices = cur_devices->seed;
}
- if (first_dev) {
- name = rcu_dereference(first_dev->name);
- seq_escape(m, name->str, " \t\n\\");
- } else {
+ if (first_dev)
+ seq_escape(m, rcu_str_deref(first_dev->name), " \t\n\\");
+ else
WARN_ON(1);
- }
rcu_read_unlock();
return 0;
}
@@ -2331,7 +2341,6 @@ static const struct super_operations btrfs_super_ops = {
.sync_fs = btrfs_sync_fs,
.show_options = btrfs_show_options,
.show_devname = btrfs_show_devname,
- .write_inode = btrfs_write_inode,
.alloc_inode = btrfs_alloc_inode,
.destroy_inode = btrfs_destroy_inode,
.statfs = btrfs_statfs,
@@ -2369,7 +2378,7 @@ static __cold void btrfs_interface_exit(void)
static void __init btrfs_print_mod_info(void)
{
- pr_info("Btrfs loaded, crc32c=%s"
+ static const char options[] = ""
#ifdef CONFIG_BTRFS_DEBUG
", debug=on"
#endif
@@ -2382,8 +2391,8 @@ static void __init btrfs_print_mod_info(void)
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
", ref-verify=on"
#endif
- "\n",
- crc32c_impl());
+ ;
+ pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options);
}
static int __init init_btrfs_fs(void)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 05:39:58 +0100