static int btrfs_remount(struct super_block *sb, int *flags, char *data);
-static const char *btrfs_decode_error(int errno)
+const char *btrfs_decode_error(int errno)
{
char *errstr = "unknown";
}
}
-#ifdef CONFIG_PRINTK
/*
* __btrfs_std_error decodes expected errors from the caller and
* invokes the approciate error response.
*/
+__cold
void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
unsigned int line, int errno, const char *fmt, ...)
{
struct super_block *sb = fs_info->sb;
+#ifdef CONFIG_PRINTK
const char *errstr;
+#endif
/*
* Special case: if the error is EROFS, and we're already
if (errno == -EROFS && (sb->s_flags & MS_RDONLY))
return;
+#ifdef CONFIG_PRINTK
errstr = btrfs_decode_error(errno);
if (fmt) {
struct va_format vaf;
printk(KERN_CRIT "BTRFS: error (device %s) in %s:%d: errno=%d %s\n",
sb->s_id, function, line, errno, errstr);
}
+#endif
/* Don't go through full error handling during mount */
save_error_info(fs_info);
btrfs_handle_error(fs_info);
}
+#ifdef CONFIG_PRINTK
static const char * const logtypes[] = {
"emergency",
"alert",
va_end(args);
}
-
-#else
-
-void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
- unsigned int line, int errno, const char *fmt, ...)
-{
- struct super_block *sb = fs_info->sb;
-
- /*
- * Special case: if the error is EROFS, and we're already
- * under MS_RDONLY, then it is safe here.
- */
- if (errno == -EROFS && (sb->s_flags & MS_RDONLY))
- return;
-
- /* Don't go through full error handling during mount */
- if (sb->s_flags & MS_BORN) {
- save_error_info(fs_info);
- btrfs_handle_error(fs_info);
- }
-}
#endif
/*
* We'll complete the cleanup in btrfs_end_transaction and
* btrfs_commit_transaction.
*/
+__cold
void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root, const char *function,
unsigned int line, int errno)
{
- /*
- * Report first abort since mount
- */
- if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,
- &root->fs_info->fs_state)) {
- WARN(1, KERN_DEBUG "BTRFS: Transaction aborted (error %d)\n",
- errno);
- }
trans->aborted = errno;
/* Nothing used. The other threads that have joined this
* transaction may be able to continue. */
* __btrfs_panic decodes unexpected, fatal errors from the caller,
* issues an alert, and either panics or BUGs, depending on mount options.
*/
+__cold
void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
unsigned int line, int errno, const char *fmt, ...)
{
Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard,
Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow,
Opt_datasum, Opt_treelog, Opt_noinode_cache,
+#ifdef CONFIG_BTRFS_DEBUG
+ Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all,
+#endif
Opt_err,
};
{Opt_rescan_uuid_tree, "rescan_uuid_tree"},
{Opt_fatal_errors, "fatal_errors=%s"},
{Opt_commit_interval, "commit=%d"},
+#ifdef CONFIG_BTRFS_DEBUG
+ {Opt_fragment_data, "fragment=data"},
+ {Opt_fragment_metadata, "fragment=metadata"},
+ {Opt_fragment_all, "fragment=all"},
+#endif
{Opt_err, NULL},
};
info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
}
break;
+#ifdef CONFIG_BTRFS_DEBUG
+ case Opt_fragment_all:
+ btrfs_info(root->fs_info, "fragmenting all space");
+ btrfs_set_opt(info->mount_opt, FRAGMENT_DATA);
+ btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA);
+ break;
+ case Opt_fragment_metadata:
+ btrfs_info(root->fs_info, "fragmenting metadata");
+ btrfs_set_opt(info->mount_opt,
+ FRAGMENT_METADATA);
+ break;
+ case Opt_fragment_data:
+ btrfs_info(root->fs_info, "fragmenting data");
+ btrfs_set_opt(info->mount_opt, FRAGMENT_DATA);
+ break;
+#endif
case Opt_err:
btrfs_info(root->fs_info, "unrecognized mount option '%s'", p);
ret = -EINVAL;
return error;
}
-static struct dentry *get_default_root(struct super_block *sb,
- u64 subvol_objectid)
+static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
+ u64 subvol_objectid)
{
- struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_root *root = fs_info->tree_root;
- struct btrfs_root *new_root;
- struct btrfs_dir_item *di;
- struct btrfs_path *path;
- struct btrfs_key location;
- struct inode *inode;
- u64 dir_id;
- int new = 0;
+ struct btrfs_root *fs_root;
+ struct btrfs_root_ref *root_ref;
+ struct btrfs_inode_ref *inode_ref;
+ struct btrfs_key key;
+ struct btrfs_path *path = NULL;
+ char *name = NULL, *ptr;
+ u64 dirid;
+ int len;
+ int ret;
+
+ path = btrfs_alloc_path();
+ if (!path) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ path->leave_spinning = 1;
+
+ name = kmalloc(PATH_MAX, GFP_NOFS);
+ if (!name) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ ptr = name + PATH_MAX - 1;
+ ptr[0] = '\0';
/*
- * We have a specific subvol we want to mount, just setup location and
- * go look up the root.
+ * Walk up the subvolume trees in the tree of tree roots by root
+ * backrefs until we hit the top-level subvolume.
*/
- if (subvol_objectid) {
- location.objectid = subvol_objectid;
- location.type = BTRFS_ROOT_ITEM_KEY;
- location.offset = (u64)-1;
- goto find_root;
+ while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) {
+ key.objectid = subvol_objectid;
+ key.type = BTRFS_ROOT_BACKREF_KEY;
+ key.offset = (u64)-1;
+
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0) {
+ goto err;
+ } else if (ret > 0) {
+ ret = btrfs_previous_item(root, path, subvol_objectid,
+ BTRFS_ROOT_BACKREF_KEY);
+ if (ret < 0) {
+ goto err;
+ } else if (ret > 0) {
+ ret = -ENOENT;
+ goto err;
+ }
+ }
+
+ btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+ subvol_objectid = key.offset;
+
+ root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_root_ref);
+ len = btrfs_root_ref_name_len(path->nodes[0], root_ref);
+ ptr -= len + 1;
+ if (ptr < name) {
+ ret = -ENAMETOOLONG;
+ goto err;
+ }
+ read_extent_buffer(path->nodes[0], ptr + 1,
+ (unsigned long)(root_ref + 1), len);
+ ptr[0] = '/';
+ dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref);
+ btrfs_release_path(path);
+
+ key.objectid = subvol_objectid;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = (u64)-1;
+ fs_root = btrfs_read_fs_root_no_name(fs_info, &key);
+ if (IS_ERR(fs_root)) {
+ ret = PTR_ERR(fs_root);
+ goto err;
+ }
+
+ /*
+ * Walk up the filesystem tree by inode refs until we hit the
+ * root directory.
+ */
+ while (dirid != BTRFS_FIRST_FREE_OBJECTID) {
+ key.objectid = dirid;
+ key.type = BTRFS_INODE_REF_KEY;
+ key.offset = (u64)-1;
+
+ ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0);
+ if (ret < 0) {
+ goto err;
+ } else if (ret > 0) {
+ ret = btrfs_previous_item(fs_root, path, dirid,
+ BTRFS_INODE_REF_KEY);
+ if (ret < 0) {
+ goto err;
+ } else if (ret > 0) {
+ ret = -ENOENT;
+ goto err;
+ }
+ }
+
+ btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+ dirid = key.offset;
+
+ inode_ref = btrfs_item_ptr(path->nodes[0],
+ path->slots[0],
+ struct btrfs_inode_ref);
+ len = btrfs_inode_ref_name_len(path->nodes[0],
+ inode_ref);
+ ptr -= len + 1;
+ if (ptr < name) {
+ ret = -ENAMETOOLONG;
+ goto err;
+ }
+ read_extent_buffer(path->nodes[0], ptr + 1,
+ (unsigned long)(inode_ref + 1), len);
+ ptr[0] = '/';
+ btrfs_release_path(path);
+ }
}
+ btrfs_free_path(path);
+ if (ptr == name + PATH_MAX - 1) {
+ name[0] = '/';
+ name[1] = '\0';
+ } else {
+ memmove(name, ptr, name + PATH_MAX - ptr);
+ }
+ return name;
+
+err:
+ btrfs_free_path(path);
+ kfree(name);
+ return ERR_PTR(ret);
+}
+
+static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid)
+{
+ struct btrfs_root *root = fs_info->tree_root;
+ struct btrfs_dir_item *di;
+ struct btrfs_path *path;
+ struct btrfs_key location;
+ u64 dir_id;
+
path = btrfs_alloc_path();
if (!path)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
path->leave_spinning = 1;
/*
di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0);
if (IS_ERR(di)) {
btrfs_free_path(path);
- return ERR_CAST(di);
+ return PTR_ERR(di);
}
if (!di) {
/*
* Ok the default dir item isn't there. This is weird since
* it's always been there, but don't freak out, just try and
- * mount to root most subvolume.
+ * mount the top-level subvolume.
*/
btrfs_free_path(path);
- dir_id = BTRFS_FIRST_FREE_OBJECTID;
- new_root = fs_info->fs_root;
- goto setup_root;
+ *objectid = BTRFS_FS_TREE_OBJECTID;
+ return 0;
}
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
btrfs_free_path(path);
-
-find_root:
- new_root = btrfs_read_fs_root_no_name(fs_info, &location);
- if (IS_ERR(new_root))
- return ERR_CAST(new_root);
-
- if (!(sb->s_flags & MS_RDONLY)) {
- int ret;
- down_read(&fs_info->cleanup_work_sem);
- ret = btrfs_orphan_cleanup(new_root);
- up_read(&fs_info->cleanup_work_sem);
- if (ret)
- return ERR_PTR(ret);
- }
-
- dir_id = btrfs_root_dirid(&new_root->root_item);
-setup_root:
- location.objectid = dir_id;
- location.type = BTRFS_INODE_ITEM_KEY;
- location.offset = 0;
-
- inode = btrfs_iget(sb, &location, new_root, &new);
- if (IS_ERR(inode))
- return ERR_CAST(inode);
-
- /*
- * If we're just mounting the root most subvol put the inode and return
- * a reference to the dentry. We will have already gotten a reference
- * to the inode in btrfs_fill_super so we're good to go.
- */
- if (!new && d_inode(sb->s_root) == inode) {
- iput(inode);
- return dget(sb->s_root);
- }
-
- return d_obtain_root(inode);
+ *objectid = location.objectid;
+ return 0;
}
static int btrfs_fill_super(struct super_block *sb,
sb->s_flags |= MS_POSIXACL;
#endif
sb->s_flags |= MS_I_VERSION;
+ sb->s_iflags |= SB_I_CGROUPWB;
err = open_ctree(sb, fs_devices, (char *)data);
if (err) {
printk(KERN_ERR "BTRFS: open_ctree failed\n");
seq_puts(seq, ",fatal_errors=panic");
if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL)
seq_printf(seq, ",commit=%d", info->commit_interval);
+#ifdef CONFIG_BTRFS_DEBUG
+ if (btrfs_test_opt(root, FRAGMENT_DATA))
+ seq_puts(seq, ",fragment=data");
+ if (btrfs_test_opt(root, FRAGMENT_METADATA))
+ seq_puts(seq, ",fragment=metadata");
+#endif
+ seq_printf(seq, ",subvolid=%llu",
+ BTRFS_I(d_inode(dentry))->root->root_key.objectid);
+ seq_puts(seq, ",subvol=");
+ seq_dentry(seq, dentry, " \t\n\\");
return 0;
}
}
/*
- * This will strip out the subvol=%s argument for an argument string and add
- * subvolid=0 to make sure we get the actual tree root for path walking to the
- * subvol we want.
+ * This will add subvolid=0 to the argument string while removing any subvol=
+ * and subvolid= arguments to make sure we get the top-level root for path
+ * walking to the subvol we want.
*/
static char *setup_root_args(char *args)
{
- unsigned len = strlen(args) + 2 + 1;
- char *src, *dst, *buf;
-
- /*
- * We need the same args as before, but with this substitution:
- * s!subvol=[^,]+!subvolid=0!
- *
- * Since the replacement string is up to 2 bytes longer than the
- * original, allocate strlen(args) + 2 + 1 bytes.
- */
+ char *buf, *dst, *sep;
- src = strstr(args, "subvol=");
- /* This shouldn't happen, but just in case.. */
- if (!src)
- return NULL;
+ if (!args)
+ return kstrdup("subvolid=0", GFP_NOFS);
- buf = dst = kmalloc(len, GFP_NOFS);
+ /* The worst case is that we add ",subvolid=0" to the end. */
+ buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS);
if (!buf)
return NULL;
- /*
- * If the subvol= arg is not at the start of the string,
- * copy whatever precedes it into buf.
- */
- if (src != args) {
- *src++ = '\0';
- strcpy(buf, args);
- dst += strlen(args);
+ while (1) {
+ sep = strchrnul(args, ',');
+ if (!strstarts(args, "subvol=") &&
+ !strstarts(args, "subvolid=")) {
+ memcpy(dst, args, sep - args);
+ dst += sep - args;
+ *dst++ = ',';
+ }
+ if (*sep)
+ args = sep + 1;
+ else
+ break;
}
-
strcpy(dst, "subvolid=0");
- dst += strlen("subvolid=0");
-
- /*
- * If there is a "," after the original subvol=... string,
- * copy that suffix into our buffer. Otherwise, we're done.
- */
- src = strchr(src, ',');
- if (src)
- strcpy(dst, src);
return buf;
}
-static struct dentry *mount_subvol(const char *subvol_name, int flags,
- const char *device_name, char *data)
+static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid,
+ int flags, const char *device_name,
+ char *data)
{
struct dentry *root;
- struct vfsmount *mnt;
+ struct vfsmount *mnt = NULL;
char *newargs;
+ int ret;
newargs = setup_root_args(data);
- if (!newargs)
- return ERR_PTR(-ENOMEM);
- mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name,
- newargs);
+ if (!newargs) {
+ root = ERR_PTR(-ENOMEM);
+ goto out;
+ }
- if (PTR_RET(mnt) == -EBUSY) {
+ mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs);
+ if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) {
if (flags & MS_RDONLY) {
- mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, device_name,
- newargs);
+ mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY,
+ device_name, newargs);
} else {
- int r;
- mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, device_name,
- newargs);
+ mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY,
+ device_name, newargs);
if (IS_ERR(mnt)) {
- kfree(newargs);
- return ERR_CAST(mnt);
+ root = ERR_CAST(mnt);
+ mnt = NULL;
+ goto out;
}
- r = btrfs_remount(mnt->mnt_sb, &flags, NULL);
- if (r < 0) {
- /* FIXME: release vfsmount mnt ??*/
- kfree(newargs);
- return ERR_PTR(r);
+ down_write(&mnt->mnt_sb->s_umount);
+ ret = btrfs_remount(mnt->mnt_sb, &flags, NULL);
+ up_write(&mnt->mnt_sb->s_umount);
+ if (ret < 0) {
+ root = ERR_PTR(ret);
+ goto out;
}
}
}
+ if (IS_ERR(mnt)) {
+ root = ERR_CAST(mnt);
+ mnt = NULL;
+ goto out;
+ }
- kfree(newargs);
+ if (!subvol_name) {
+ if (!subvol_objectid) {
+ ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb),
+ &subvol_objectid);
+ if (ret) {
+ root = ERR_PTR(ret);
+ goto out;
+ }
+ }
+ subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb),
+ subvol_objectid);
+ if (IS_ERR(subvol_name)) {
+ root = ERR_CAST(subvol_name);
+ subvol_name = NULL;
+ goto out;
+ }
- if (IS_ERR(mnt))
- return ERR_CAST(mnt);
+ }
root = mount_subtree(mnt, subvol_name);
+ /* mount_subtree() drops our reference on the vfsmount. */
+ mnt = NULL;
- if (!IS_ERR(root) && !is_subvolume_inode(d_inode(root))) {
+ if (!IS_ERR(root)) {
struct super_block *s = root->d_sb;
- dput(root);
- root = ERR_PTR(-EINVAL);
- deactivate_locked_super(s);
- printk(KERN_ERR "BTRFS: '%s' is not a valid subvolume\n",
- subvol_name);
+ struct inode *root_inode = d_inode(root);
+ u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid;
+
+ ret = 0;
+ if (!is_subvolume_inode(root_inode)) {
+ pr_err("BTRFS: '%s' is not a valid subvolume\n",
+ subvol_name);
+ ret = -EINVAL;
+ }
+ if (subvol_objectid && root_objectid != subvol_objectid) {
+ /*
+ * This will also catch a race condition where a
+ * subvolume which was passed by ID is renamed and
+ * another subvolume is renamed over the old location.
+ */
+ pr_err("BTRFS: subvol '%s' does not match subvolid %llu\n",
+ subvol_name, subvol_objectid);
+ ret = -EINVAL;
+ }
+ if (ret) {
+ dput(root);
+ root = ERR_PTR(ret);
+ deactivate_locked_super(s);
+ }
}
+out:
+ mntput(mnt);
+ kfree(newargs);
+ kfree(subvol_name);
return root;
}
{
struct block_device *bdev = NULL;
struct super_block *s;
- struct dentry *root;
struct btrfs_fs_devices *fs_devices = NULL;
struct btrfs_fs_info *fs_info = NULL;
struct security_mnt_opts new_sec_opts;
return ERR_PTR(error);
}
- if (subvol_name) {
- root = mount_subvol(subvol_name, flags, device_name, data);
- kfree(subvol_name);
- return root;
+ if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) {
+ /* mount_subvol() will free subvol_name. */
+ return mount_subvol(subvol_name, subvol_objectid, flags,
+ device_name, data);
}
security_init_mnt_opts(&new_sec_opts);
error = btrfs_fill_super(s, fs_devices, data,
flags & MS_SILENT ? 1 : 0);
}
-
- root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error);
- if (IS_ERR(root)) {
+ if (error) {
deactivate_locked_super(s);
- error = PTR_ERR(root);
goto error_sec_opts;
}
fs_info = btrfs_sb(s);
error = setup_security_options(fs_info, s, &new_sec_opts);
if (error) {
- dput(root);
deactivate_locked_super(s);
goto error_sec_opts;
}
- return root;
+ return dget(s->s_root);
error_close_devices:
btrfs_close_devices(fs_devices);
sb->s_flags |= MS_RDONLY;
+ /*
+ * Setting MS_RDONLY will put the cleaner thread to
+ * sleep at the next loop if it's already active.
+ * If it's already asleep, we'll leave unused block
+ * groups on disk until we're mounted read-write again
+ * unless we clean them up here.
+ */
+ btrfs_delete_unused_bgs(fs_info);
+
btrfs_dev_replace_suspend_for_unmount(fs_info);
btrfs_scrub_cancel(fs_info);
btrfs_pause_balance(fs_info);
* there are other factors that may change the result (like a new metadata
* chunk).
*
+ * If metadata is exhausted, f_bavail will be 0.
+ *
* FIXME: not accurate for mixed block groups, total and free/used are ok,
* available appears slightly larger.
*/
struct btrfs_space_info *found;
u64 total_used = 0;
u64 total_free_data = 0;
+ u64 total_free_meta = 0;
int bits = dentry->d_sb->s_blocksize_bits;
__be32 *fsid = (__be32 *)fs_info->fsid;
unsigned factor = 1;
struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
int ret;
+ u64 thresh = 0;
/*
* holding chunk_muext to avoid allocating new chunks, holding
}
}
}
+ if (found->flags & BTRFS_BLOCK_GROUP_METADATA)
+ total_free_meta += found->disk_total - found->disk_used;
total_used += found->disk_used;
}
buf->f_bavail += div_u64(total_free_data, factor);
buf->f_bavail = buf->f_bavail >> bits;
+ /*
+ * We calculate the remaining metadata space minus global reserve. If
+ * this is (supposedly) smaller than zero, there's no space. But this
+ * does not hold in practice, the exhausted state happens where's still
+ * some positive delta. So we apply some guesswork and compare the
+ * delta to a 4M threshold. (Practically observed delta was ~2M.)
+ *
+ * We probably cannot calculate the exact threshold value because this
+ * depends on the internal reservations requested by various
+ * operations, so some operations that consume a few metadata will
+ * succeed even if the Avail is zero. But this is better than the other
+ * way around.
+ */
+ thresh = 4 * 1024 * 1024;
+
+ if (total_free_meta - thresh < block_rsv->size)
+ buf->f_bavail = 0;
+
buf->f_type = BTRFS_SUPER_MAGIC;
buf->f_bsize = dentry->d_sb->s_blocksize;
buf->f_namelen = BTRFS_NAME_LEN;
static void btrfs_interface_exit(void)
{
- if (misc_deregister(&btrfs_misc) < 0)
- printk(KERN_INFO "BTRFS: misc_deregister failed for control device\n");
+ misc_deregister(&btrfs_misc);
}
static void btrfs_print_info(void)
Code Review / kvmfornfv.git / blobdiff