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2481 lines
64 KiB
2481 lines
64 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* This file is part of UBIFS. |
|
* |
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* Copyright (C) 2006-2008 Nokia Corporation. |
|
* |
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* Authors: Artem Bityutskiy (Битюцкий Артём) |
|
* Adrian Hunter |
|
*/ |
|
|
|
/* |
|
* This file implements UBIFS initialization and VFS superblock operations. Some |
|
* initialization stuff which is rather large and complex is placed at |
|
* corresponding subsystems, but most of it is here. |
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*/ |
|
|
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#include <linux/init.h> |
|
#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/ctype.h> |
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#include <linux/kthread.h> |
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#include <linux/parser.h> |
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#include <linux/seq_file.h> |
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#include <linux/mount.h> |
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#include <linux/math64.h> |
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#include <linux/writeback.h> |
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#include "ubifs.h" |
|
|
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static int ubifs_default_version_set(const char *val, const struct kernel_param *kp) |
|
{ |
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int n = 0, ret; |
|
|
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ret = kstrtoint(val, 10, &n); |
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if (ret != 0 || n < 4 || n > UBIFS_FORMAT_VERSION) |
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return -EINVAL; |
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return param_set_int(val, kp); |
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} |
|
|
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static const struct kernel_param_ops ubifs_default_version_ops = { |
|
.set = ubifs_default_version_set, |
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.get = param_get_int, |
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}; |
|
|
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int ubifs_default_version = UBIFS_FORMAT_VERSION; |
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module_param_cb(default_version, &ubifs_default_version_ops, &ubifs_default_version, 0600); |
|
|
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/* |
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* Maximum amount of memory we may 'kmalloc()' without worrying that we are |
|
* allocating too much. |
|
*/ |
|
#define UBIFS_KMALLOC_OK (128*1024) |
|
|
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/* Slab cache for UBIFS inodes */ |
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static struct kmem_cache *ubifs_inode_slab; |
|
|
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/* UBIFS TNC shrinker description */ |
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static struct shrinker ubifs_shrinker_info = { |
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.scan_objects = ubifs_shrink_scan, |
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.count_objects = ubifs_shrink_count, |
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.seeks = DEFAULT_SEEKS, |
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}; |
|
|
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/** |
|
* validate_inode - validate inode. |
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* @c: UBIFS file-system description object |
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* @inode: the inode to validate |
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* |
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* This is a helper function for 'ubifs_iget()' which validates various fields |
|
* of a newly built inode to make sure they contain sane values and prevent |
|
* possible vulnerabilities. Returns zero if the inode is all right and |
|
* a non-zero error code if not. |
|
*/ |
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static int validate_inode(struct ubifs_info *c, const struct inode *inode) |
|
{ |
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int err; |
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const struct ubifs_inode *ui = ubifs_inode(inode); |
|
|
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if (inode->i_size > c->max_inode_sz) { |
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ubifs_err(c, "inode is too large (%lld)", |
|
(long long)inode->i_size); |
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return 1; |
|
} |
|
|
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if (ui->compr_type >= UBIFS_COMPR_TYPES_CNT) { |
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ubifs_err(c, "unknown compression type %d", ui->compr_type); |
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return 2; |
|
} |
|
|
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if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX) |
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return 3; |
|
|
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if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA) |
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return 4; |
|
|
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if (ui->xattr && !S_ISREG(inode->i_mode)) |
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return 5; |
|
|
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if (!ubifs_compr_present(c, ui->compr_type)) { |
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ubifs_warn(c, "inode %lu uses '%s' compression, but it was not compiled in", |
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inode->i_ino, ubifs_compr_name(c, ui->compr_type)); |
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} |
|
|
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err = dbg_check_dir(c, inode); |
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return err; |
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} |
|
|
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struct inode *ubifs_iget(struct super_block *sb, unsigned long inum) |
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{ |
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int err; |
|
union ubifs_key key; |
|
struct ubifs_ino_node *ino; |
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struct ubifs_info *c = sb->s_fs_info; |
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struct inode *inode; |
|
struct ubifs_inode *ui; |
|
|
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dbg_gen("inode %lu", inum); |
|
|
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inode = iget_locked(sb, inum); |
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if (!inode) |
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return ERR_PTR(-ENOMEM); |
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if (!(inode->i_state & I_NEW)) |
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return inode; |
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ui = ubifs_inode(inode); |
|
|
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ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS); |
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if (!ino) { |
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err = -ENOMEM; |
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goto out; |
|
} |
|
|
|
ino_key_init(c, &key, inode->i_ino); |
|
|
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err = ubifs_tnc_lookup(c, &key, ino); |
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if (err) |
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goto out_ino; |
|
|
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inode->i_flags |= S_NOCMTIME; |
|
|
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if (!IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT)) |
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inode->i_flags |= S_NOATIME; |
|
|
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set_nlink(inode, le32_to_cpu(ino->nlink)); |
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i_uid_write(inode, le32_to_cpu(ino->uid)); |
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i_gid_write(inode, le32_to_cpu(ino->gid)); |
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inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec); |
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inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec); |
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inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec); |
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inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec); |
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inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec); |
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inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec); |
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inode->i_mode = le32_to_cpu(ino->mode); |
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inode->i_size = le64_to_cpu(ino->size); |
|
|
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ui->data_len = le32_to_cpu(ino->data_len); |
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ui->flags = le32_to_cpu(ino->flags); |
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ui->compr_type = le16_to_cpu(ino->compr_type); |
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ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum); |
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ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt); |
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ui->xattr_size = le32_to_cpu(ino->xattr_size); |
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ui->xattr_names = le32_to_cpu(ino->xattr_names); |
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ui->synced_i_size = ui->ui_size = inode->i_size; |
|
|
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ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0; |
|
|
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err = validate_inode(c, inode); |
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if (err) |
|
goto out_invalid; |
|
|
|
switch (inode->i_mode & S_IFMT) { |
|
case S_IFREG: |
|
inode->i_mapping->a_ops = &ubifs_file_address_operations; |
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inode->i_op = &ubifs_file_inode_operations; |
|
inode->i_fop = &ubifs_file_operations; |
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if (ui->xattr) { |
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ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); |
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if (!ui->data) { |
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err = -ENOMEM; |
|
goto out_ino; |
|
} |
|
memcpy(ui->data, ino->data, ui->data_len); |
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((char *)ui->data)[ui->data_len] = '\0'; |
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} else if (ui->data_len != 0) { |
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err = 10; |
|
goto out_invalid; |
|
} |
|
break; |
|
case S_IFDIR: |
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inode->i_op = &ubifs_dir_inode_operations; |
|
inode->i_fop = &ubifs_dir_operations; |
|
if (ui->data_len != 0) { |
|
err = 11; |
|
goto out_invalid; |
|
} |
|
break; |
|
case S_IFLNK: |
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inode->i_op = &ubifs_symlink_inode_operations; |
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if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) { |
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err = 12; |
|
goto out_invalid; |
|
} |
|
ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); |
|
if (!ui->data) { |
|
err = -ENOMEM; |
|
goto out_ino; |
|
} |
|
memcpy(ui->data, ino->data, ui->data_len); |
|
((char *)ui->data)[ui->data_len] = '\0'; |
|
break; |
|
case S_IFBLK: |
|
case S_IFCHR: |
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{ |
|
dev_t rdev; |
|
union ubifs_dev_desc *dev; |
|
|
|
ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); |
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if (!ui->data) { |
|
err = -ENOMEM; |
|
goto out_ino; |
|
} |
|
|
|
dev = (union ubifs_dev_desc *)ino->data; |
|
if (ui->data_len == sizeof(dev->new)) |
|
rdev = new_decode_dev(le32_to_cpu(dev->new)); |
|
else if (ui->data_len == sizeof(dev->huge)) |
|
rdev = huge_decode_dev(le64_to_cpu(dev->huge)); |
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else { |
|
err = 13; |
|
goto out_invalid; |
|
} |
|
memcpy(ui->data, ino->data, ui->data_len); |
|
inode->i_op = &ubifs_file_inode_operations; |
|
init_special_inode(inode, inode->i_mode, rdev); |
|
break; |
|
} |
|
case S_IFSOCK: |
|
case S_IFIFO: |
|
inode->i_op = &ubifs_file_inode_operations; |
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init_special_inode(inode, inode->i_mode, 0); |
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if (ui->data_len != 0) { |
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err = 14; |
|
goto out_invalid; |
|
} |
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break; |
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default: |
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err = 15; |
|
goto out_invalid; |
|
} |
|
|
|
kfree(ino); |
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ubifs_set_inode_flags(inode); |
|
unlock_new_inode(inode); |
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return inode; |
|
|
|
out_invalid: |
|
ubifs_err(c, "inode %lu validation failed, error %d", inode->i_ino, err); |
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ubifs_dump_node(c, ino); |
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ubifs_dump_inode(c, inode); |
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err = -EINVAL; |
|
out_ino: |
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kfree(ino); |
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out: |
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ubifs_err(c, "failed to read inode %lu, error %d", inode->i_ino, err); |
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iget_failed(inode); |
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return ERR_PTR(err); |
|
} |
|
|
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static struct inode *ubifs_alloc_inode(struct super_block *sb) |
|
{ |
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struct ubifs_inode *ui; |
|
|
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ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS); |
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if (!ui) |
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return NULL; |
|
|
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memset((void *)ui + sizeof(struct inode), 0, |
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sizeof(struct ubifs_inode) - sizeof(struct inode)); |
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mutex_init(&ui->ui_mutex); |
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init_rwsem(&ui->xattr_sem); |
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spin_lock_init(&ui->ui_lock); |
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return &ui->vfs_inode; |
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}; |
|
|
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static void ubifs_free_inode(struct inode *inode) |
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{ |
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struct ubifs_inode *ui = ubifs_inode(inode); |
|
|
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kfree(ui->data); |
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fscrypt_free_inode(inode); |
|
|
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kmem_cache_free(ubifs_inode_slab, ui); |
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} |
|
|
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/* |
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* Note, Linux write-back code calls this without 'i_mutex'. |
|
*/ |
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static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc) |
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{ |
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int err = 0; |
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struct ubifs_info *c = inode->i_sb->s_fs_info; |
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struct ubifs_inode *ui = ubifs_inode(inode); |
|
|
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ubifs_assert(c, !ui->xattr); |
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if (is_bad_inode(inode)) |
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return 0; |
|
|
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mutex_lock(&ui->ui_mutex); |
|
/* |
|
* Due to races between write-back forced by budgeting |
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* (see 'sync_some_inodes()') and background write-back, the inode may |
|
* have already been synchronized, do not do this again. This might |
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* also happen if it was synchronized in an VFS operation, e.g. |
|
* 'ubifs_link()'. |
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*/ |
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if (!ui->dirty) { |
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mutex_unlock(&ui->ui_mutex); |
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return 0; |
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} |
|
|
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/* |
|
* As an optimization, do not write orphan inodes to the media just |
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* because this is not needed. |
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*/ |
|
dbg_gen("inode %lu, mode %#x, nlink %u", |
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inode->i_ino, (int)inode->i_mode, inode->i_nlink); |
|
if (inode->i_nlink) { |
|
err = ubifs_jnl_write_inode(c, inode); |
|
if (err) |
|
ubifs_err(c, "can't write inode %lu, error %d", |
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inode->i_ino, err); |
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else |
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err = dbg_check_inode_size(c, inode, ui->ui_size); |
|
} |
|
|
|
ui->dirty = 0; |
|
mutex_unlock(&ui->ui_mutex); |
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ubifs_release_dirty_inode_budget(c, ui); |
|
return err; |
|
} |
|
|
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static int ubifs_drop_inode(struct inode *inode) |
|
{ |
|
int drop = generic_drop_inode(inode); |
|
|
|
if (!drop) |
|
drop = fscrypt_drop_inode(inode); |
|
|
|
return drop; |
|
} |
|
|
|
static void ubifs_evict_inode(struct inode *inode) |
|
{ |
|
int err; |
|
struct ubifs_info *c = inode->i_sb->s_fs_info; |
|
struct ubifs_inode *ui = ubifs_inode(inode); |
|
|
|
if (ui->xattr) |
|
/* |
|
* Extended attribute inode deletions are fully handled in |
|
* 'ubifs_removexattr()'. These inodes are special and have |
|
* limited usage, so there is nothing to do here. |
|
*/ |
|
goto out; |
|
|
|
dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode); |
|
ubifs_assert(c, !atomic_read(&inode->i_count)); |
|
|
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truncate_inode_pages_final(&inode->i_data); |
|
|
|
if (inode->i_nlink) |
|
goto done; |
|
|
|
if (is_bad_inode(inode)) |
|
goto out; |
|
|
|
ui->ui_size = inode->i_size = 0; |
|
err = ubifs_jnl_delete_inode(c, inode); |
|
if (err) |
|
/* |
|
* Worst case we have a lost orphan inode wasting space, so a |
|
* simple error message is OK here. |
|
*/ |
|
ubifs_err(c, "can't delete inode %lu, error %d", |
|
inode->i_ino, err); |
|
|
|
out: |
|
if (ui->dirty) |
|
ubifs_release_dirty_inode_budget(c, ui); |
|
else { |
|
/* We've deleted something - clean the "no space" flags */ |
|
c->bi.nospace = c->bi.nospace_rp = 0; |
|
smp_wmb(); |
|
} |
|
done: |
|
clear_inode(inode); |
|
fscrypt_put_encryption_info(inode); |
|
} |
|
|
|
static void ubifs_dirty_inode(struct inode *inode, int flags) |
|
{ |
|
struct ubifs_info *c = inode->i_sb->s_fs_info; |
|
struct ubifs_inode *ui = ubifs_inode(inode); |
|
|
|
ubifs_assert(c, mutex_is_locked(&ui->ui_mutex)); |
|
if (!ui->dirty) { |
|
ui->dirty = 1; |
|
dbg_gen("inode %lu", inode->i_ino); |
|
} |
|
} |
|
|
|
static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf) |
|
{ |
|
struct ubifs_info *c = dentry->d_sb->s_fs_info; |
|
unsigned long long free; |
|
__le32 *uuid = (__le32 *)c->uuid; |
|
|
|
free = ubifs_get_free_space(c); |
|
dbg_gen("free space %lld bytes (%lld blocks)", |
|
free, free >> UBIFS_BLOCK_SHIFT); |
|
|
|
buf->f_type = UBIFS_SUPER_MAGIC; |
|
buf->f_bsize = UBIFS_BLOCK_SIZE; |
|
buf->f_blocks = c->block_cnt; |
|
buf->f_bfree = free >> UBIFS_BLOCK_SHIFT; |
|
if (free > c->report_rp_size) |
|
buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT; |
|
else |
|
buf->f_bavail = 0; |
|
buf->f_files = 0; |
|
buf->f_ffree = 0; |
|
buf->f_namelen = UBIFS_MAX_NLEN; |
|
buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]); |
|
buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]); |
|
ubifs_assert(c, buf->f_bfree <= c->block_cnt); |
|
return 0; |
|
} |
|
|
|
static int ubifs_show_options(struct seq_file *s, struct dentry *root) |
|
{ |
|
struct ubifs_info *c = root->d_sb->s_fs_info; |
|
|
|
if (c->mount_opts.unmount_mode == 2) |
|
seq_puts(s, ",fast_unmount"); |
|
else if (c->mount_opts.unmount_mode == 1) |
|
seq_puts(s, ",norm_unmount"); |
|
|
|
if (c->mount_opts.bulk_read == 2) |
|
seq_puts(s, ",bulk_read"); |
|
else if (c->mount_opts.bulk_read == 1) |
|
seq_puts(s, ",no_bulk_read"); |
|
|
|
if (c->mount_opts.chk_data_crc == 2) |
|
seq_puts(s, ",chk_data_crc"); |
|
else if (c->mount_opts.chk_data_crc == 1) |
|
seq_puts(s, ",no_chk_data_crc"); |
|
|
|
if (c->mount_opts.override_compr) { |
|
seq_printf(s, ",compr=%s", |
|
ubifs_compr_name(c, c->mount_opts.compr_type)); |
|
} |
|
|
|
seq_printf(s, ",assert=%s", ubifs_assert_action_name(c)); |
|
seq_printf(s, ",ubi=%d,vol=%d", c->vi.ubi_num, c->vi.vol_id); |
|
|
|
return 0; |
|
} |
|
|
|
static int ubifs_sync_fs(struct super_block *sb, int wait) |
|
{ |
|
int i, err; |
|
struct ubifs_info *c = sb->s_fs_info; |
|
|
|
/* |
|
* Zero @wait is just an advisory thing to help the file system shove |
|
* lots of data into the queues, and there will be the second |
|
* '->sync_fs()' call, with non-zero @wait. |
|
*/ |
|
if (!wait) |
|
return 0; |
|
|
|
/* |
|
* Synchronize write buffers, because 'ubifs_run_commit()' does not |
|
* do this if it waits for an already running commit. |
|
*/ |
|
for (i = 0; i < c->jhead_cnt; i++) { |
|
err = ubifs_wbuf_sync(&c->jheads[i].wbuf); |
|
if (err) |
|
return err; |
|
} |
|
|
|
/* |
|
* Strictly speaking, it is not necessary to commit the journal here, |
|
* synchronizing write-buffers would be enough. But committing makes |
|
* UBIFS free space predictions much more accurate, so we want to let |
|
* the user be able to get more accurate results of 'statfs()' after |
|
* they synchronize the file system. |
|
*/ |
|
err = ubifs_run_commit(c); |
|
if (err) |
|
return err; |
|
|
|
return ubi_sync(c->vi.ubi_num); |
|
} |
|
|
|
/** |
|
* init_constants_early - initialize UBIFS constants. |
|
* @c: UBIFS file-system description object |
|
* |
|
* This function initialize UBIFS constants which do not need the superblock to |
|
* be read. It also checks that the UBI volume satisfies basic UBIFS |
|
* requirements. Returns zero in case of success and a negative error code in |
|
* case of failure. |
|
*/ |
|
static int init_constants_early(struct ubifs_info *c) |
|
{ |
|
if (c->vi.corrupted) { |
|
ubifs_warn(c, "UBI volume is corrupted - read-only mode"); |
|
c->ro_media = 1; |
|
} |
|
|
|
if (c->di.ro_mode) { |
|
ubifs_msg(c, "read-only UBI device"); |
|
c->ro_media = 1; |
|
} |
|
|
|
if (c->vi.vol_type == UBI_STATIC_VOLUME) { |
|
ubifs_msg(c, "static UBI volume - read-only mode"); |
|
c->ro_media = 1; |
|
} |
|
|
|
c->leb_cnt = c->vi.size; |
|
c->leb_size = c->vi.usable_leb_size; |
|
c->leb_start = c->di.leb_start; |
|
c->half_leb_size = c->leb_size / 2; |
|
c->min_io_size = c->di.min_io_size; |
|
c->min_io_shift = fls(c->min_io_size) - 1; |
|
c->max_write_size = c->di.max_write_size; |
|
c->max_write_shift = fls(c->max_write_size) - 1; |
|
|
|
if (c->leb_size < UBIFS_MIN_LEB_SZ) { |
|
ubifs_errc(c, "too small LEBs (%d bytes), min. is %d bytes", |
|
c->leb_size, UBIFS_MIN_LEB_SZ); |
|
return -EINVAL; |
|
} |
|
|
|
if (c->leb_cnt < UBIFS_MIN_LEB_CNT) { |
|
ubifs_errc(c, "too few LEBs (%d), min. is %d", |
|
c->leb_cnt, UBIFS_MIN_LEB_CNT); |
|
return -EINVAL; |
|
} |
|
|
|
if (!is_power_of_2(c->min_io_size)) { |
|
ubifs_errc(c, "bad min. I/O size %d", c->min_io_size); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* Maximum write size has to be greater or equivalent to min. I/O |
|
* size, and be multiple of min. I/O size. |
|
*/ |
|
if (c->max_write_size < c->min_io_size || |
|
c->max_write_size % c->min_io_size || |
|
!is_power_of_2(c->max_write_size)) { |
|
ubifs_errc(c, "bad write buffer size %d for %d min. I/O unit", |
|
c->max_write_size, c->min_io_size); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* UBIFS aligns all node to 8-byte boundary, so to make function in |
|
* io.c simpler, assume minimum I/O unit size to be 8 bytes if it is |
|
* less than 8. |
|
*/ |
|
if (c->min_io_size < 8) { |
|
c->min_io_size = 8; |
|
c->min_io_shift = 3; |
|
if (c->max_write_size < c->min_io_size) { |
|
c->max_write_size = c->min_io_size; |
|
c->max_write_shift = c->min_io_shift; |
|
} |
|
} |
|
|
|
c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size); |
|
c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size); |
|
|
|
/* |
|
* Initialize node length ranges which are mostly needed for node |
|
* length validation. |
|
*/ |
|
c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ; |
|
c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ; |
|
c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ; |
|
c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ; |
|
c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ; |
|
c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ; |
|
c->ranges[UBIFS_AUTH_NODE].min_len = UBIFS_AUTH_NODE_SZ; |
|
c->ranges[UBIFS_AUTH_NODE].max_len = UBIFS_AUTH_NODE_SZ + |
|
UBIFS_MAX_HMAC_LEN; |
|
c->ranges[UBIFS_SIG_NODE].min_len = UBIFS_SIG_NODE_SZ; |
|
c->ranges[UBIFS_SIG_NODE].max_len = c->leb_size - UBIFS_SB_NODE_SZ; |
|
|
|
c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ; |
|
c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ; |
|
c->ranges[UBIFS_ORPH_NODE].min_len = |
|
UBIFS_ORPH_NODE_SZ + sizeof(__le64); |
|
c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size; |
|
c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ; |
|
c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ; |
|
c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ; |
|
c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ; |
|
c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ; |
|
c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ; |
|
/* |
|
* Minimum indexing node size is amended later when superblock is |
|
* read and the key length is known. |
|
*/ |
|
c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ; |
|
/* |
|
* Maximum indexing node size is amended later when superblock is |
|
* read and the fanout is known. |
|
*/ |
|
c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX; |
|
|
|
/* |
|
* Initialize dead and dark LEB space watermarks. See gc.c for comments |
|
* about these values. |
|
*/ |
|
c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size); |
|
c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size); |
|
|
|
/* |
|
* Calculate how many bytes would be wasted at the end of LEB if it was |
|
* fully filled with data nodes of maximum size. This is used in |
|
* calculations when reporting free space. |
|
*/ |
|
c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ; |
|
|
|
/* Buffer size for bulk-reads */ |
|
c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ; |
|
if (c->max_bu_buf_len > c->leb_size) |
|
c->max_bu_buf_len = c->leb_size; |
|
|
|
/* Log is ready, preserve one LEB for commits. */ |
|
c->min_log_bytes = c->leb_size; |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* bud_wbuf_callback - bud LEB write-buffer synchronization call-back. |
|
* @c: UBIFS file-system description object |
|
* @lnum: LEB the write-buffer was synchronized to |
|
* @free: how many free bytes left in this LEB |
|
* @pad: how many bytes were padded |
|
* |
|
* This is a callback function which is called by the I/O unit when the |
|
* write-buffer is synchronized. We need this to correctly maintain space |
|
* accounting in bud logical eraseblocks. This function returns zero in case of |
|
* success and a negative error code in case of failure. |
|
* |
|
* This function actually belongs to the journal, but we keep it here because |
|
* we want to keep it static. |
|
*/ |
|
static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad) |
|
{ |
|
return ubifs_update_one_lp(c, lnum, free, pad, 0, 0); |
|
} |
|
|
|
/* |
|
* init_constants_sb - initialize UBIFS constants. |
|
* @c: UBIFS file-system description object |
|
* |
|
* This is a helper function which initializes various UBIFS constants after |
|
* the superblock has been read. It also checks various UBIFS parameters and |
|
* makes sure they are all right. Returns zero in case of success and a |
|
* negative error code in case of failure. |
|
*/ |
|
static int init_constants_sb(struct ubifs_info *c) |
|
{ |
|
int tmp, err; |
|
long long tmp64; |
|
|
|
c->main_bytes = (long long)c->main_lebs * c->leb_size; |
|
c->max_znode_sz = sizeof(struct ubifs_znode) + |
|
c->fanout * sizeof(struct ubifs_zbranch); |
|
|
|
tmp = ubifs_idx_node_sz(c, 1); |
|
c->ranges[UBIFS_IDX_NODE].min_len = tmp; |
|
c->min_idx_node_sz = ALIGN(tmp, 8); |
|
|
|
tmp = ubifs_idx_node_sz(c, c->fanout); |
|
c->ranges[UBIFS_IDX_NODE].max_len = tmp; |
|
c->max_idx_node_sz = ALIGN(tmp, 8); |
|
|
|
/* Make sure LEB size is large enough to fit full commit */ |
|
tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt; |
|
tmp = ALIGN(tmp, c->min_io_size); |
|
if (tmp > c->leb_size) { |
|
ubifs_err(c, "too small LEB size %d, at least %d needed", |
|
c->leb_size, tmp); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* Make sure that the log is large enough to fit reference nodes for |
|
* all buds plus one reserved LEB. |
|
*/ |
|
tmp64 = c->max_bud_bytes + c->leb_size - 1; |
|
c->max_bud_cnt = div_u64(tmp64, c->leb_size); |
|
tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1); |
|
tmp /= c->leb_size; |
|
tmp += 1; |
|
if (c->log_lebs < tmp) { |
|
ubifs_err(c, "too small log %d LEBs, required min. %d LEBs", |
|
c->log_lebs, tmp); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* When budgeting we assume worst-case scenarios when the pages are not |
|
* be compressed and direntries are of the maximum size. |
|
* |
|
* Note, data, which may be stored in inodes is budgeted separately, so |
|
* it is not included into 'c->bi.inode_budget'. |
|
*/ |
|
c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE; |
|
c->bi.inode_budget = UBIFS_INO_NODE_SZ; |
|
c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ; |
|
|
|
/* |
|
* When the amount of flash space used by buds becomes |
|
* 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit. |
|
* The writers are unblocked when the commit is finished. To avoid |
|
* writers to be blocked UBIFS initiates background commit in advance, |
|
* when number of bud bytes becomes above the limit defined below. |
|
*/ |
|
c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4; |
|
|
|
/* |
|
* Ensure minimum journal size. All the bytes in the journal heads are |
|
* considered to be used, when calculating the current journal usage. |
|
* Consequently, if the journal is too small, UBIFS will treat it as |
|
* always full. |
|
*/ |
|
tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1; |
|
if (c->bg_bud_bytes < tmp64) |
|
c->bg_bud_bytes = tmp64; |
|
if (c->max_bud_bytes < tmp64 + c->leb_size) |
|
c->max_bud_bytes = tmp64 + c->leb_size; |
|
|
|
err = ubifs_calc_lpt_geom(c); |
|
if (err) |
|
return err; |
|
|
|
/* Initialize effective LEB size used in budgeting calculations */ |
|
c->idx_leb_size = c->leb_size - c->max_idx_node_sz; |
|
return 0; |
|
} |
|
|
|
/* |
|
* init_constants_master - initialize UBIFS constants. |
|
* @c: UBIFS file-system description object |
|
* |
|
* This is a helper function which initializes various UBIFS constants after |
|
* the master node has been read. It also checks various UBIFS parameters and |
|
* makes sure they are all right. |
|
*/ |
|
static void init_constants_master(struct ubifs_info *c) |
|
{ |
|
long long tmp64; |
|
|
|
c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
|
c->report_rp_size = ubifs_reported_space(c, c->rp_size); |
|
|
|
/* |
|
* Calculate total amount of FS blocks. This number is not used |
|
* internally because it does not make much sense for UBIFS, but it is |
|
* necessary to report something for the 'statfs()' call. |
|
* |
|
* Subtract the LEB reserved for GC, the LEB which is reserved for |
|
* deletions, minimum LEBs for the index, and assume only one journal |
|
* head is available. |
|
*/ |
|
tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1; |
|
tmp64 *= (long long)c->leb_size - c->leb_overhead; |
|
tmp64 = ubifs_reported_space(c, tmp64); |
|
c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT; |
|
} |
|
|
|
/** |
|
* take_gc_lnum - reserve GC LEB. |
|
* @c: UBIFS file-system description object |
|
* |
|
* This function ensures that the LEB reserved for garbage collection is marked |
|
* as "taken" in lprops. We also have to set free space to LEB size and dirty |
|
* space to zero, because lprops may contain out-of-date information if the |
|
* file-system was un-mounted before it has been committed. This function |
|
* returns zero in case of success and a negative error code in case of |
|
* failure. |
|
*/ |
|
static int take_gc_lnum(struct ubifs_info *c) |
|
{ |
|
int err; |
|
|
|
if (c->gc_lnum == -1) { |
|
ubifs_err(c, "no LEB for GC"); |
|
return -EINVAL; |
|
} |
|
|
|
/* And we have to tell lprops that this LEB is taken */ |
|
err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0, |
|
LPROPS_TAKEN, 0, 0); |
|
return err; |
|
} |
|
|
|
/** |
|
* alloc_wbufs - allocate write-buffers. |
|
* @c: UBIFS file-system description object |
|
* |
|
* This helper function allocates and initializes UBIFS write-buffers. Returns |
|
* zero in case of success and %-ENOMEM in case of failure. |
|
*/ |
|
static int alloc_wbufs(struct ubifs_info *c) |
|
{ |
|
int i, err; |
|
|
|
c->jheads = kcalloc(c->jhead_cnt, sizeof(struct ubifs_jhead), |
|
GFP_KERNEL); |
|
if (!c->jheads) |
|
return -ENOMEM; |
|
|
|
/* Initialize journal heads */ |
|
for (i = 0; i < c->jhead_cnt; i++) { |
|
INIT_LIST_HEAD(&c->jheads[i].buds_list); |
|
err = ubifs_wbuf_init(c, &c->jheads[i].wbuf); |
|
if (err) |
|
return err; |
|
|
|
c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback; |
|
c->jheads[i].wbuf.jhead = i; |
|
c->jheads[i].grouped = 1; |
|
c->jheads[i].log_hash = ubifs_hash_get_desc(c); |
|
if (IS_ERR(c->jheads[i].log_hash)) { |
|
err = PTR_ERR(c->jheads[i].log_hash); |
|
goto out; |
|
} |
|
} |
|
|
|
/* |
|
* Garbage Collector head does not need to be synchronized by timer. |
|
* Also GC head nodes are not grouped. |
|
*/ |
|
c->jheads[GCHD].wbuf.no_timer = 1; |
|
c->jheads[GCHD].grouped = 0; |
|
|
|
return 0; |
|
|
|
out: |
|
while (i--) |
|
kfree(c->jheads[i].log_hash); |
|
|
|
return err; |
|
} |
|
|
|
/** |
|
* free_wbufs - free write-buffers. |
|
* @c: UBIFS file-system description object |
|
*/ |
|
static void free_wbufs(struct ubifs_info *c) |
|
{ |
|
int i; |
|
|
|
if (c->jheads) { |
|
for (i = 0; i < c->jhead_cnt; i++) { |
|
kfree(c->jheads[i].wbuf.buf); |
|
kfree(c->jheads[i].wbuf.inodes); |
|
kfree(c->jheads[i].log_hash); |
|
} |
|
kfree(c->jheads); |
|
c->jheads = NULL; |
|
} |
|
} |
|
|
|
/** |
|
* free_orphans - free orphans. |
|
* @c: UBIFS file-system description object |
|
*/ |
|
static void free_orphans(struct ubifs_info *c) |
|
{ |
|
struct ubifs_orphan *orph; |
|
|
|
while (c->orph_dnext) { |
|
orph = c->orph_dnext; |
|
c->orph_dnext = orph->dnext; |
|
list_del(&orph->list); |
|
kfree(orph); |
|
} |
|
|
|
while (!list_empty(&c->orph_list)) { |
|
orph = list_entry(c->orph_list.next, struct ubifs_orphan, list); |
|
list_del(&orph->list); |
|
kfree(orph); |
|
ubifs_err(c, "orphan list not empty at unmount"); |
|
} |
|
|
|
vfree(c->orph_buf); |
|
c->orph_buf = NULL; |
|
} |
|
|
|
/** |
|
* free_buds - free per-bud objects. |
|
* @c: UBIFS file-system description object |
|
*/ |
|
static void free_buds(struct ubifs_info *c) |
|
{ |
|
struct ubifs_bud *bud, *n; |
|
|
|
rbtree_postorder_for_each_entry_safe(bud, n, &c->buds, rb) |
|
kfree(bud); |
|
} |
|
|
|
/** |
|
* check_volume_empty - check if the UBI volume is empty. |
|
* @c: UBIFS file-system description object |
|
* |
|
* This function checks if the UBIFS volume is empty by looking if its LEBs are |
|
* mapped or not. The result of checking is stored in the @c->empty variable. |
|
* Returns zero in case of success and a negative error code in case of |
|
* failure. |
|
*/ |
|
static int check_volume_empty(struct ubifs_info *c) |
|
{ |
|
int lnum, err; |
|
|
|
c->empty = 1; |
|
for (lnum = 0; lnum < c->leb_cnt; lnum++) { |
|
err = ubifs_is_mapped(c, lnum); |
|
if (unlikely(err < 0)) |
|
return err; |
|
if (err == 1) { |
|
c->empty = 0; |
|
break; |
|
} |
|
|
|
cond_resched(); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* UBIFS mount options. |
|
* |
|
* Opt_fast_unmount: do not run a journal commit before un-mounting |
|
* Opt_norm_unmount: run a journal commit before un-mounting |
|
* Opt_bulk_read: enable bulk-reads |
|
* Opt_no_bulk_read: disable bulk-reads |
|
* Opt_chk_data_crc: check CRCs when reading data nodes |
|
* Opt_no_chk_data_crc: do not check CRCs when reading data nodes |
|
* Opt_override_compr: override default compressor |
|
* Opt_assert: set ubifs_assert() action |
|
* Opt_auth_key: The key name used for authentication |
|
* Opt_auth_hash_name: The hash type used for authentication |
|
* Opt_err: just end of array marker |
|
*/ |
|
enum { |
|
Opt_fast_unmount, |
|
Opt_norm_unmount, |
|
Opt_bulk_read, |
|
Opt_no_bulk_read, |
|
Opt_chk_data_crc, |
|
Opt_no_chk_data_crc, |
|
Opt_override_compr, |
|
Opt_assert, |
|
Opt_auth_key, |
|
Opt_auth_hash_name, |
|
Opt_ignore, |
|
Opt_err, |
|
}; |
|
|
|
static const match_table_t tokens = { |
|
{Opt_fast_unmount, "fast_unmount"}, |
|
{Opt_norm_unmount, "norm_unmount"}, |
|
{Opt_bulk_read, "bulk_read"}, |
|
{Opt_no_bulk_read, "no_bulk_read"}, |
|
{Opt_chk_data_crc, "chk_data_crc"}, |
|
{Opt_no_chk_data_crc, "no_chk_data_crc"}, |
|
{Opt_override_compr, "compr=%s"}, |
|
{Opt_auth_key, "auth_key=%s"}, |
|
{Opt_auth_hash_name, "auth_hash_name=%s"}, |
|
{Opt_ignore, "ubi=%s"}, |
|
{Opt_ignore, "vol=%s"}, |
|
{Opt_assert, "assert=%s"}, |
|
{Opt_err, NULL}, |
|
}; |
|
|
|
/** |
|
* parse_standard_option - parse a standard mount option. |
|
* @option: the option to parse |
|
* |
|
* Normally, standard mount options like "sync" are passed to file-systems as |
|
* flags. However, when a "rootflags=" kernel boot parameter is used, they may |
|
* be present in the options string. This function tries to deal with this |
|
* situation and parse standard options. Returns 0 if the option was not |
|
* recognized, and the corresponding integer flag if it was. |
|
* |
|
* UBIFS is only interested in the "sync" option, so do not check for anything |
|
* else. |
|
*/ |
|
static int parse_standard_option(const char *option) |
|
{ |
|
|
|
pr_notice("UBIFS: parse %s\n", option); |
|
if (!strcmp(option, "sync")) |
|
return SB_SYNCHRONOUS; |
|
return 0; |
|
} |
|
|
|
/** |
|
* ubifs_parse_options - parse mount parameters. |
|
* @c: UBIFS file-system description object |
|
* @options: parameters to parse |
|
* @is_remount: non-zero if this is FS re-mount |
|
* |
|
* This function parses UBIFS mount options and returns zero in case success |
|
* and a negative error code in case of failure. |
|
*/ |
|
static int ubifs_parse_options(struct ubifs_info *c, char *options, |
|
int is_remount) |
|
{ |
|
char *p; |
|
substring_t args[MAX_OPT_ARGS]; |
|
|
|
if (!options) |
|
return 0; |
|
|
|
while ((p = strsep(&options, ","))) { |
|
int token; |
|
|
|
if (!*p) |
|
continue; |
|
|
|
token = match_token(p, tokens, args); |
|
switch (token) { |
|
/* |
|
* %Opt_fast_unmount and %Opt_norm_unmount options are ignored. |
|
* We accept them in order to be backward-compatible. But this |
|
* should be removed at some point. |
|
*/ |
|
case Opt_fast_unmount: |
|
c->mount_opts.unmount_mode = 2; |
|
break; |
|
case Opt_norm_unmount: |
|
c->mount_opts.unmount_mode = 1; |
|
break; |
|
case Opt_bulk_read: |
|
c->mount_opts.bulk_read = 2; |
|
c->bulk_read = 1; |
|
break; |
|
case Opt_no_bulk_read: |
|
c->mount_opts.bulk_read = 1; |
|
c->bulk_read = 0; |
|
break; |
|
case Opt_chk_data_crc: |
|
c->mount_opts.chk_data_crc = 2; |
|
c->no_chk_data_crc = 0; |
|
break; |
|
case Opt_no_chk_data_crc: |
|
c->mount_opts.chk_data_crc = 1; |
|
c->no_chk_data_crc = 1; |
|
break; |
|
case Opt_override_compr: |
|
{ |
|
char *name = match_strdup(&args[0]); |
|
|
|
if (!name) |
|
return -ENOMEM; |
|
if (!strcmp(name, "none")) |
|
c->mount_opts.compr_type = UBIFS_COMPR_NONE; |
|
else if (!strcmp(name, "lzo")) |
|
c->mount_opts.compr_type = UBIFS_COMPR_LZO; |
|
else if (!strcmp(name, "zlib")) |
|
c->mount_opts.compr_type = UBIFS_COMPR_ZLIB; |
|
else if (!strcmp(name, "zstd")) |
|
c->mount_opts.compr_type = UBIFS_COMPR_ZSTD; |
|
else { |
|
ubifs_err(c, "unknown compressor \"%s\"", name); //FIXME: is c ready? |
|
kfree(name); |
|
return -EINVAL; |
|
} |
|
kfree(name); |
|
c->mount_opts.override_compr = 1; |
|
c->default_compr = c->mount_opts.compr_type; |
|
break; |
|
} |
|
case Opt_assert: |
|
{ |
|
char *act = match_strdup(&args[0]); |
|
|
|
if (!act) |
|
return -ENOMEM; |
|
if (!strcmp(act, "report")) |
|
c->assert_action = ASSACT_REPORT; |
|
else if (!strcmp(act, "read-only")) |
|
c->assert_action = ASSACT_RO; |
|
else if (!strcmp(act, "panic")) |
|
c->assert_action = ASSACT_PANIC; |
|
else { |
|
ubifs_err(c, "unknown assert action \"%s\"", act); |
|
kfree(act); |
|
return -EINVAL; |
|
} |
|
kfree(act); |
|
break; |
|
} |
|
case Opt_auth_key: |
|
if (!is_remount) { |
|
c->auth_key_name = kstrdup(args[0].from, |
|
GFP_KERNEL); |
|
if (!c->auth_key_name) |
|
return -ENOMEM; |
|
} |
|
break; |
|
case Opt_auth_hash_name: |
|
if (!is_remount) { |
|
c->auth_hash_name = kstrdup(args[0].from, |
|
GFP_KERNEL); |
|
if (!c->auth_hash_name) |
|
return -ENOMEM; |
|
} |
|
break; |
|
case Opt_ignore: |
|
break; |
|
default: |
|
{ |
|
unsigned long flag; |
|
struct super_block *sb = c->vfs_sb; |
|
|
|
flag = parse_standard_option(p); |
|
if (!flag) { |
|
ubifs_err(c, "unrecognized mount option \"%s\" or missing value", |
|
p); |
|
return -EINVAL; |
|
} |
|
sb->s_flags |= flag; |
|
break; |
|
} |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* ubifs_release_options - release mount parameters which have been dumped. |
|
* @c: UBIFS file-system description object |
|
*/ |
|
static void ubifs_release_options(struct ubifs_info *c) |
|
{ |
|
kfree(c->auth_key_name); |
|
c->auth_key_name = NULL; |
|
kfree(c->auth_hash_name); |
|
c->auth_hash_name = NULL; |
|
} |
|
|
|
/** |
|
* destroy_journal - destroy journal data structures. |
|
* @c: UBIFS file-system description object |
|
* |
|
* This function destroys journal data structures including those that may have |
|
* been created by recovery functions. |
|
*/ |
|
static void destroy_journal(struct ubifs_info *c) |
|
{ |
|
while (!list_empty(&c->unclean_leb_list)) { |
|
struct ubifs_unclean_leb *ucleb; |
|
|
|
ucleb = list_entry(c->unclean_leb_list.next, |
|
struct ubifs_unclean_leb, list); |
|
list_del(&ucleb->list); |
|
kfree(ucleb); |
|
} |
|
while (!list_empty(&c->old_buds)) { |
|
struct ubifs_bud *bud; |
|
|
|
bud = list_entry(c->old_buds.next, struct ubifs_bud, list); |
|
list_del(&bud->list); |
|
kfree(bud); |
|
} |
|
ubifs_destroy_idx_gc(c); |
|
ubifs_destroy_size_tree(c); |
|
ubifs_tnc_close(c); |
|
free_buds(c); |
|
} |
|
|
|
/** |
|
* bu_init - initialize bulk-read information. |
|
* @c: UBIFS file-system description object |
|
*/ |
|
static void bu_init(struct ubifs_info *c) |
|
{ |
|
ubifs_assert(c, c->bulk_read == 1); |
|
|
|
if (c->bu.buf) |
|
return; /* Already initialized */ |
|
|
|
again: |
|
c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN); |
|
if (!c->bu.buf) { |
|
if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) { |
|
c->max_bu_buf_len = UBIFS_KMALLOC_OK; |
|
goto again; |
|
} |
|
|
|
/* Just disable bulk-read */ |
|
ubifs_warn(c, "cannot allocate %d bytes of memory for bulk-read, disabling it", |
|
c->max_bu_buf_len); |
|
c->mount_opts.bulk_read = 1; |
|
c->bulk_read = 0; |
|
return; |
|
} |
|
} |
|
|
|
/** |
|
* check_free_space - check if there is enough free space to mount. |
|
* @c: UBIFS file-system description object |
|
* |
|
* This function makes sure UBIFS has enough free space to be mounted in |
|
* read/write mode. UBIFS must always have some free space to allow deletions. |
|
*/ |
|
static int check_free_space(struct ubifs_info *c) |
|
{ |
|
ubifs_assert(c, c->dark_wm > 0); |
|
if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) { |
|
ubifs_err(c, "insufficient free space to mount in R/W mode"); |
|
ubifs_dump_budg(c, &c->bi); |
|
ubifs_dump_lprops(c); |
|
return -ENOSPC; |
|
} |
|
return 0; |
|
} |
|
|
|
/** |
|
* mount_ubifs - mount UBIFS file-system. |
|
* @c: UBIFS file-system description object |
|
* |
|
* This function mounts UBIFS file system. Returns zero in case of success and |
|
* a negative error code in case of failure. |
|
*/ |
|
static int mount_ubifs(struct ubifs_info *c) |
|
{ |
|
int err; |
|
long long x, y; |
|
size_t sz; |
|
|
|
c->ro_mount = !!sb_rdonly(c->vfs_sb); |
|
/* Suppress error messages while probing if SB_SILENT is set */ |
|
c->probing = !!(c->vfs_sb->s_flags & SB_SILENT); |
|
|
|
err = init_constants_early(c); |
|
if (err) |
|
return err; |
|
|
|
err = ubifs_debugging_init(c); |
|
if (err) |
|
return err; |
|
|
|
err = check_volume_empty(c); |
|
if (err) |
|
goto out_free; |
|
|
|
if (c->empty && (c->ro_mount || c->ro_media)) { |
|
/* |
|
* This UBI volume is empty, and read-only, or the file system |
|
* is mounted read-only - we cannot format it. |
|
*/ |
|
ubifs_err(c, "can't format empty UBI volume: read-only %s", |
|
c->ro_media ? "UBI volume" : "mount"); |
|
err = -EROFS; |
|
goto out_free; |
|
} |
|
|
|
if (c->ro_media && !c->ro_mount) { |
|
ubifs_err(c, "cannot mount read-write - read-only media"); |
|
err = -EROFS; |
|
goto out_free; |
|
} |
|
|
|
/* |
|
* The requirement for the buffer is that it should fit indexing B-tree |
|
* height amount of integers. We assume the height if the TNC tree will |
|
* never exceed 64. |
|
*/ |
|
err = -ENOMEM; |
|
c->bottom_up_buf = kmalloc_array(BOTTOM_UP_HEIGHT, sizeof(int), |
|
GFP_KERNEL); |
|
if (!c->bottom_up_buf) |
|
goto out_free; |
|
|
|
c->sbuf = vmalloc(c->leb_size); |
|
if (!c->sbuf) |
|
goto out_free; |
|
|
|
if (!c->ro_mount) { |
|
c->ileb_buf = vmalloc(c->leb_size); |
|
if (!c->ileb_buf) |
|
goto out_free; |
|
} |
|
|
|
if (c->bulk_read == 1) |
|
bu_init(c); |
|
|
|
if (!c->ro_mount) { |
|
c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \ |
|
UBIFS_CIPHER_BLOCK_SIZE, |
|
GFP_KERNEL); |
|
if (!c->write_reserve_buf) |
|
goto out_free; |
|
} |
|
|
|
c->mounting = 1; |
|
|
|
if (c->auth_key_name) { |
|
if (IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION)) { |
|
err = ubifs_init_authentication(c); |
|
if (err) |
|
goto out_free; |
|
} else { |
|
ubifs_err(c, "auth_key_name, but UBIFS is built without" |
|
" authentication support"); |
|
err = -EINVAL; |
|
goto out_free; |
|
} |
|
} |
|
|
|
err = ubifs_read_superblock(c); |
|
if (err) |
|
goto out_auth; |
|
|
|
c->probing = 0; |
|
|
|
/* |
|
* Make sure the compressor which is set as default in the superblock |
|
* or overridden by mount options is actually compiled in. |
|
*/ |
|
if (!ubifs_compr_present(c, c->default_compr)) { |
|
ubifs_err(c, "'compressor \"%s\" is not compiled in", |
|
ubifs_compr_name(c, c->default_compr)); |
|
err = -ENOTSUPP; |
|
goto out_auth; |
|
} |
|
|
|
err = init_constants_sb(c); |
|
if (err) |
|
goto out_auth; |
|
|
|
sz = ALIGN(c->max_idx_node_sz, c->min_io_size) * 2; |
|
c->cbuf = kmalloc(sz, GFP_NOFS); |
|
if (!c->cbuf) { |
|
err = -ENOMEM; |
|
goto out_auth; |
|
} |
|
|
|
err = alloc_wbufs(c); |
|
if (err) |
|
goto out_cbuf; |
|
|
|
sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id); |
|
if (!c->ro_mount) { |
|
/* Create background thread */ |
|
c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
|
if (IS_ERR(c->bgt)) { |
|
err = PTR_ERR(c->bgt); |
|
c->bgt = NULL; |
|
ubifs_err(c, "cannot spawn \"%s\", error %d", |
|
c->bgt_name, err); |
|
goto out_wbufs; |
|
} |
|
wake_up_process(c->bgt); |
|
} |
|
|
|
err = ubifs_read_master(c); |
|
if (err) |
|
goto out_master; |
|
|
|
init_constants_master(c); |
|
|
|
if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) { |
|
ubifs_msg(c, "recovery needed"); |
|
c->need_recovery = 1; |
|
} |
|
|
|
if (c->need_recovery && !c->ro_mount) { |
|
err = ubifs_recover_inl_heads(c, c->sbuf); |
|
if (err) |
|
goto out_master; |
|
} |
|
|
|
err = ubifs_lpt_init(c, 1, !c->ro_mount); |
|
if (err) |
|
goto out_master; |
|
|
|
if (!c->ro_mount && c->space_fixup) { |
|
err = ubifs_fixup_free_space(c); |
|
if (err) |
|
goto out_lpt; |
|
} |
|
|
|
if (!c->ro_mount && !c->need_recovery) { |
|
/* |
|
* Set the "dirty" flag so that if we reboot uncleanly we |
|
* will notice this immediately on the next mount. |
|
*/ |
|
c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); |
|
err = ubifs_write_master(c); |
|
if (err) |
|
goto out_lpt; |
|
} |
|
|
|
/* |
|
* Handle offline signed images: Now that the master node is |
|
* written and its validation no longer depends on the hash |
|
* in the superblock, we can update the offline signed |
|
* superblock with a HMAC version, |
|
*/ |
|
if (ubifs_authenticated(c) && ubifs_hmac_zero(c, c->sup_node->hmac)) { |
|
err = ubifs_hmac_wkm(c, c->sup_node->hmac_wkm); |
|
if (err) |
|
goto out_lpt; |
|
c->superblock_need_write = 1; |
|
} |
|
|
|
if (!c->ro_mount && c->superblock_need_write) { |
|
err = ubifs_write_sb_node(c, c->sup_node); |
|
if (err) |
|
goto out_lpt; |
|
c->superblock_need_write = 0; |
|
} |
|
|
|
err = dbg_check_idx_size(c, c->bi.old_idx_sz); |
|
if (err) |
|
goto out_lpt; |
|
|
|
err = ubifs_replay_journal(c); |
|
if (err) |
|
goto out_journal; |
|
|
|
/* Calculate 'min_idx_lebs' after journal replay */ |
|
c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
|
|
|
err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount); |
|
if (err) |
|
goto out_orphans; |
|
|
|
if (!c->ro_mount) { |
|
int lnum; |
|
|
|
err = check_free_space(c); |
|
if (err) |
|
goto out_orphans; |
|
|
|
/* Check for enough log space */ |
|
lnum = c->lhead_lnum + 1; |
|
if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) |
|
lnum = UBIFS_LOG_LNUM; |
|
if (lnum == c->ltail_lnum) { |
|
err = ubifs_consolidate_log(c); |
|
if (err) |
|
goto out_orphans; |
|
} |
|
|
|
if (c->need_recovery) { |
|
if (!ubifs_authenticated(c)) { |
|
err = ubifs_recover_size(c, true); |
|
if (err) |
|
goto out_orphans; |
|
} |
|
|
|
err = ubifs_rcvry_gc_commit(c); |
|
if (err) |
|
goto out_orphans; |
|
|
|
if (ubifs_authenticated(c)) { |
|
err = ubifs_recover_size(c, false); |
|
if (err) |
|
goto out_orphans; |
|
} |
|
} else { |
|
err = take_gc_lnum(c); |
|
if (err) |
|
goto out_orphans; |
|
|
|
/* |
|
* GC LEB may contain garbage if there was an unclean |
|
* reboot, and it should be un-mapped. |
|
*/ |
|
err = ubifs_leb_unmap(c, c->gc_lnum); |
|
if (err) |
|
goto out_orphans; |
|
} |
|
|
|
err = dbg_check_lprops(c); |
|
if (err) |
|
goto out_orphans; |
|
} else if (c->need_recovery) { |
|
err = ubifs_recover_size(c, false); |
|
if (err) |
|
goto out_orphans; |
|
} else { |
|
/* |
|
* Even if we mount read-only, we have to set space in GC LEB |
|
* to proper value because this affects UBIFS free space |
|
* reporting. We do not want to have a situation when |
|
* re-mounting from R/O to R/W changes amount of free space. |
|
*/ |
|
err = take_gc_lnum(c); |
|
if (err) |
|
goto out_orphans; |
|
} |
|
|
|
spin_lock(&ubifs_infos_lock); |
|
list_add_tail(&c->infos_list, &ubifs_infos); |
|
spin_unlock(&ubifs_infos_lock); |
|
|
|
if (c->need_recovery) { |
|
if (c->ro_mount) |
|
ubifs_msg(c, "recovery deferred"); |
|
else { |
|
c->need_recovery = 0; |
|
ubifs_msg(c, "recovery completed"); |
|
/* |
|
* GC LEB has to be empty and taken at this point. But |
|
* the journal head LEBs may also be accounted as |
|
* "empty taken" if they are empty. |
|
*/ |
|
ubifs_assert(c, c->lst.taken_empty_lebs > 0); |
|
} |
|
} else |
|
ubifs_assert(c, c->lst.taken_empty_lebs > 0); |
|
|
|
err = dbg_check_filesystem(c); |
|
if (err) |
|
goto out_infos; |
|
|
|
dbg_debugfs_init_fs(c); |
|
|
|
c->mounting = 0; |
|
|
|
ubifs_msg(c, "UBIFS: mounted UBI device %d, volume %d, name \"%s\"%s", |
|
c->vi.ubi_num, c->vi.vol_id, c->vi.name, |
|
c->ro_mount ? ", R/O mode" : ""); |
|
x = (long long)c->main_lebs * c->leb_size; |
|
y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes; |
|
ubifs_msg(c, "LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes", |
|
c->leb_size, c->leb_size >> 10, c->min_io_size, |
|
c->max_write_size); |
|
ubifs_msg(c, "FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)", |
|
x, x >> 20, c->main_lebs, |
|
y, y >> 20, c->log_lebs + c->max_bud_cnt); |
|
ubifs_msg(c, "reserved for root: %llu bytes (%llu KiB)", |
|
c->report_rp_size, c->report_rp_size >> 10); |
|
ubifs_msg(c, "media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s", |
|
c->fmt_version, c->ro_compat_version, |
|
UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid, |
|
c->big_lpt ? ", big LPT model" : ", small LPT model"); |
|
|
|
dbg_gen("default compressor: %s", ubifs_compr_name(c, c->default_compr)); |
|
dbg_gen("data journal heads: %d", |
|
c->jhead_cnt - NONDATA_JHEADS_CNT); |
|
dbg_gen("log LEBs: %d (%d - %d)", |
|
c->log_lebs, UBIFS_LOG_LNUM, c->log_last); |
|
dbg_gen("LPT area LEBs: %d (%d - %d)", |
|
c->lpt_lebs, c->lpt_first, c->lpt_last); |
|
dbg_gen("orphan area LEBs: %d (%d - %d)", |
|
c->orph_lebs, c->orph_first, c->orph_last); |
|
dbg_gen("main area LEBs: %d (%d - %d)", |
|
c->main_lebs, c->main_first, c->leb_cnt - 1); |
|
dbg_gen("index LEBs: %d", c->lst.idx_lebs); |
|
dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)", |
|
c->bi.old_idx_sz, c->bi.old_idx_sz >> 10, |
|
c->bi.old_idx_sz >> 20); |
|
dbg_gen("key hash type: %d", c->key_hash_type); |
|
dbg_gen("tree fanout: %d", c->fanout); |
|
dbg_gen("reserved GC LEB: %d", c->gc_lnum); |
|
dbg_gen("max. znode size %d", c->max_znode_sz); |
|
dbg_gen("max. index node size %d", c->max_idx_node_sz); |
|
dbg_gen("node sizes: data %zu, inode %zu, dentry %zu", |
|
UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ); |
|
dbg_gen("node sizes: trun %zu, sb %zu, master %zu", |
|
UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ); |
|
dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu", |
|
UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ); |
|
dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d", |
|
UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ, |
|
UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout)); |
|
dbg_gen("dead watermark: %d", c->dead_wm); |
|
dbg_gen("dark watermark: %d", c->dark_wm); |
|
dbg_gen("LEB overhead: %d", c->leb_overhead); |
|
x = (long long)c->main_lebs * c->dark_wm; |
|
dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)", |
|
x, x >> 10, x >> 20); |
|
dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)", |
|
c->max_bud_bytes, c->max_bud_bytes >> 10, |
|
c->max_bud_bytes >> 20); |
|
dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)", |
|
c->bg_bud_bytes, c->bg_bud_bytes >> 10, |
|
c->bg_bud_bytes >> 20); |
|
dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)", |
|
c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20); |
|
dbg_gen("max. seq. number: %llu", c->max_sqnum); |
|
dbg_gen("commit number: %llu", c->cmt_no); |
|
dbg_gen("max. xattrs per inode: %d", ubifs_xattr_max_cnt(c)); |
|
dbg_gen("max orphans: %d", c->max_orphans); |
|
|
|
return 0; |
|
|
|
out_infos: |
|
spin_lock(&ubifs_infos_lock); |
|
list_del(&c->infos_list); |
|
spin_unlock(&ubifs_infos_lock); |
|
out_orphans: |
|
free_orphans(c); |
|
out_journal: |
|
destroy_journal(c); |
|
out_lpt: |
|
ubifs_lpt_free(c, 0); |
|
out_master: |
|
kfree(c->mst_node); |
|
kfree(c->rcvrd_mst_node); |
|
if (c->bgt) |
|
kthread_stop(c->bgt); |
|
out_wbufs: |
|
free_wbufs(c); |
|
out_cbuf: |
|
kfree(c->cbuf); |
|
out_auth: |
|
ubifs_exit_authentication(c); |
|
out_free: |
|
kfree(c->write_reserve_buf); |
|
kfree(c->bu.buf); |
|
vfree(c->ileb_buf); |
|
vfree(c->sbuf); |
|
kfree(c->bottom_up_buf); |
|
kfree(c->sup_node); |
|
ubifs_debugging_exit(c); |
|
return err; |
|
} |
|
|
|
/** |
|
* ubifs_umount - un-mount UBIFS file-system. |
|
* @c: UBIFS file-system description object |
|
* |
|
* Note, this function is called to free allocated resourced when un-mounting, |
|
* as well as free resources when an error occurred while we were half way |
|
* through mounting (error path cleanup function). So it has to make sure the |
|
* resource was actually allocated before freeing it. |
|
*/ |
|
static void ubifs_umount(struct ubifs_info *c) |
|
{ |
|
dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num, |
|
c->vi.vol_id); |
|
|
|
dbg_debugfs_exit_fs(c); |
|
spin_lock(&ubifs_infos_lock); |
|
list_del(&c->infos_list); |
|
spin_unlock(&ubifs_infos_lock); |
|
|
|
if (c->bgt) |
|
kthread_stop(c->bgt); |
|
|
|
destroy_journal(c); |
|
free_wbufs(c); |
|
free_orphans(c); |
|
ubifs_lpt_free(c, 0); |
|
ubifs_exit_authentication(c); |
|
|
|
ubifs_release_options(c); |
|
kfree(c->cbuf); |
|
kfree(c->rcvrd_mst_node); |
|
kfree(c->mst_node); |
|
kfree(c->write_reserve_buf); |
|
kfree(c->bu.buf); |
|
vfree(c->ileb_buf); |
|
vfree(c->sbuf); |
|
kfree(c->bottom_up_buf); |
|
kfree(c->sup_node); |
|
ubifs_debugging_exit(c); |
|
} |
|
|
|
/** |
|
* ubifs_remount_rw - re-mount in read-write mode. |
|
* @c: UBIFS file-system description object |
|
* |
|
* UBIFS avoids allocating many unnecessary resources when mounted in read-only |
|
* mode. This function allocates the needed resources and re-mounts UBIFS in |
|
* read-write mode. |
|
*/ |
|
static int ubifs_remount_rw(struct ubifs_info *c) |
|
{ |
|
int err, lnum; |
|
|
|
if (c->rw_incompat) { |
|
ubifs_err(c, "the file-system is not R/W-compatible"); |
|
ubifs_msg(c, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d", |
|
c->fmt_version, c->ro_compat_version, |
|
UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION); |
|
return -EROFS; |
|
} |
|
|
|
mutex_lock(&c->umount_mutex); |
|
dbg_save_space_info(c); |
|
c->remounting_rw = 1; |
|
c->ro_mount = 0; |
|
|
|
if (c->space_fixup) { |
|
err = ubifs_fixup_free_space(c); |
|
if (err) |
|
goto out; |
|
} |
|
|
|
err = check_free_space(c); |
|
if (err) |
|
goto out; |
|
|
|
if (c->need_recovery) { |
|
ubifs_msg(c, "completing deferred recovery"); |
|
err = ubifs_write_rcvrd_mst_node(c); |
|
if (err) |
|
goto out; |
|
if (!ubifs_authenticated(c)) { |
|
err = ubifs_recover_size(c, true); |
|
if (err) |
|
goto out; |
|
} |
|
err = ubifs_clean_lebs(c, c->sbuf); |
|
if (err) |
|
goto out; |
|
err = ubifs_recover_inl_heads(c, c->sbuf); |
|
if (err) |
|
goto out; |
|
} else { |
|
/* A readonly mount is not allowed to have orphans */ |
|
ubifs_assert(c, c->tot_orphans == 0); |
|
err = ubifs_clear_orphans(c); |
|
if (err) |
|
goto out; |
|
} |
|
|
|
if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) { |
|
c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); |
|
err = ubifs_write_master(c); |
|
if (err) |
|
goto out; |
|
} |
|
|
|
if (c->superblock_need_write) { |
|
struct ubifs_sb_node *sup = c->sup_node; |
|
|
|
err = ubifs_write_sb_node(c, sup); |
|
if (err) |
|
goto out; |
|
|
|
c->superblock_need_write = 0; |
|
} |
|
|
|
c->ileb_buf = vmalloc(c->leb_size); |
|
if (!c->ileb_buf) { |
|
err = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \ |
|
UBIFS_CIPHER_BLOCK_SIZE, GFP_KERNEL); |
|
if (!c->write_reserve_buf) { |
|
err = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
err = ubifs_lpt_init(c, 0, 1); |
|
if (err) |
|
goto out; |
|
|
|
/* Create background thread */ |
|
c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
|
if (IS_ERR(c->bgt)) { |
|
err = PTR_ERR(c->bgt); |
|
c->bgt = NULL; |
|
ubifs_err(c, "cannot spawn \"%s\", error %d", |
|
c->bgt_name, err); |
|
goto out; |
|
} |
|
wake_up_process(c->bgt); |
|
|
|
c->orph_buf = vmalloc(c->leb_size); |
|
if (!c->orph_buf) { |
|
err = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
/* Check for enough log space */ |
|
lnum = c->lhead_lnum + 1; |
|
if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) |
|
lnum = UBIFS_LOG_LNUM; |
|
if (lnum == c->ltail_lnum) { |
|
err = ubifs_consolidate_log(c); |
|
if (err) |
|
goto out; |
|
} |
|
|
|
if (c->need_recovery) { |
|
err = ubifs_rcvry_gc_commit(c); |
|
if (err) |
|
goto out; |
|
|
|
if (ubifs_authenticated(c)) { |
|
err = ubifs_recover_size(c, false); |
|
if (err) |
|
goto out; |
|
} |
|
} else { |
|
err = ubifs_leb_unmap(c, c->gc_lnum); |
|
} |
|
if (err) |
|
goto out; |
|
|
|
dbg_gen("re-mounted read-write"); |
|
c->remounting_rw = 0; |
|
|
|
if (c->need_recovery) { |
|
c->need_recovery = 0; |
|
ubifs_msg(c, "deferred recovery completed"); |
|
} else { |
|
/* |
|
* Do not run the debugging space check if the were doing |
|
* recovery, because when we saved the information we had the |
|
* file-system in a state where the TNC and lprops has been |
|
* modified in memory, but all the I/O operations (including a |
|
* commit) were deferred. So the file-system was in |
|
* "non-committed" state. Now the file-system is in committed |
|
* state, and of course the amount of free space will change |
|
* because, for example, the old index size was imprecise. |
|
*/ |
|
err = dbg_check_space_info(c); |
|
} |
|
|
|
mutex_unlock(&c->umount_mutex); |
|
return err; |
|
|
|
out: |
|
c->ro_mount = 1; |
|
vfree(c->orph_buf); |
|
c->orph_buf = NULL; |
|
if (c->bgt) { |
|
kthread_stop(c->bgt); |
|
c->bgt = NULL; |
|
} |
|
free_wbufs(c); |
|
kfree(c->write_reserve_buf); |
|
c->write_reserve_buf = NULL; |
|
vfree(c->ileb_buf); |
|
c->ileb_buf = NULL; |
|
ubifs_lpt_free(c, 1); |
|
c->remounting_rw = 0; |
|
mutex_unlock(&c->umount_mutex); |
|
return err; |
|
} |
|
|
|
/** |
|
* ubifs_remount_ro - re-mount in read-only mode. |
|
* @c: UBIFS file-system description object |
|
* |
|
* We assume VFS has stopped writing. Possibly the background thread could be |
|
* running a commit, however kthread_stop will wait in that case. |
|
*/ |
|
static void ubifs_remount_ro(struct ubifs_info *c) |
|
{ |
|
int i, err; |
|
|
|
ubifs_assert(c, !c->need_recovery); |
|
ubifs_assert(c, !c->ro_mount); |
|
|
|
mutex_lock(&c->umount_mutex); |
|
if (c->bgt) { |
|
kthread_stop(c->bgt); |
|
c->bgt = NULL; |
|
} |
|
|
|
dbg_save_space_info(c); |
|
|
|
for (i = 0; i < c->jhead_cnt; i++) { |
|
err = ubifs_wbuf_sync(&c->jheads[i].wbuf); |
|
if (err) |
|
ubifs_ro_mode(c, err); |
|
} |
|
|
|
c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
|
c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); |
|
c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); |
|
err = ubifs_write_master(c); |
|
if (err) |
|
ubifs_ro_mode(c, err); |
|
|
|
vfree(c->orph_buf); |
|
c->orph_buf = NULL; |
|
kfree(c->write_reserve_buf); |
|
c->write_reserve_buf = NULL; |
|
vfree(c->ileb_buf); |
|
c->ileb_buf = NULL; |
|
ubifs_lpt_free(c, 1); |
|
c->ro_mount = 1; |
|
err = dbg_check_space_info(c); |
|
if (err) |
|
ubifs_ro_mode(c, err); |
|
mutex_unlock(&c->umount_mutex); |
|
} |
|
|
|
static void ubifs_put_super(struct super_block *sb) |
|
{ |
|
int i; |
|
struct ubifs_info *c = sb->s_fs_info; |
|
|
|
ubifs_msg(c, "un-mount UBI device %d", c->vi.ubi_num); |
|
|
|
/* |
|
* The following asserts are only valid if there has not been a failure |
|
* of the media. For example, there will be dirty inodes if we failed |
|
* to write them back because of I/O errors. |
|
*/ |
|
if (!c->ro_error) { |
|
ubifs_assert(c, c->bi.idx_growth == 0); |
|
ubifs_assert(c, c->bi.dd_growth == 0); |
|
ubifs_assert(c, c->bi.data_growth == 0); |
|
} |
|
|
|
/* |
|
* The 'c->umount_lock' prevents races between UBIFS memory shrinker |
|
* and file system un-mount. Namely, it prevents the shrinker from |
|
* picking this superblock for shrinking - it will be just skipped if |
|
* the mutex is locked. |
|
*/ |
|
mutex_lock(&c->umount_mutex); |
|
if (!c->ro_mount) { |
|
/* |
|
* First of all kill the background thread to make sure it does |
|
* not interfere with un-mounting and freeing resources. |
|
*/ |
|
if (c->bgt) { |
|
kthread_stop(c->bgt); |
|
c->bgt = NULL; |
|
} |
|
|
|
/* |
|
* On fatal errors c->ro_error is set to 1, in which case we do |
|
* not write the master node. |
|
*/ |
|
if (!c->ro_error) { |
|
int err; |
|
|
|
/* Synchronize write-buffers */ |
|
for (i = 0; i < c->jhead_cnt; i++) { |
|
err = ubifs_wbuf_sync(&c->jheads[i].wbuf); |
|
if (err) |
|
ubifs_ro_mode(c, err); |
|
} |
|
|
|
/* |
|
* We are being cleanly unmounted which means the |
|
* orphans were killed - indicate this in the master |
|
* node. Also save the reserved GC LEB number. |
|
*/ |
|
c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
|
c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); |
|
c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); |
|
err = ubifs_write_master(c); |
|
if (err) |
|
/* |
|
* Recovery will attempt to fix the master area |
|
* next mount, so we just print a message and |
|
* continue to unmount normally. |
|
*/ |
|
ubifs_err(c, "failed to write master node, error %d", |
|
err); |
|
} else { |
|
for (i = 0; i < c->jhead_cnt; i++) |
|
/* Make sure write-buffer timers are canceled */ |
|
hrtimer_cancel(&c->jheads[i].wbuf.timer); |
|
} |
|
} |
|
|
|
ubifs_umount(c); |
|
ubi_close_volume(c->ubi); |
|
mutex_unlock(&c->umount_mutex); |
|
} |
|
|
|
static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data) |
|
{ |
|
int err; |
|
struct ubifs_info *c = sb->s_fs_info; |
|
|
|
sync_filesystem(sb); |
|
dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags); |
|
|
|
err = ubifs_parse_options(c, data, 1); |
|
if (err) { |
|
ubifs_err(c, "invalid or unknown remount parameter"); |
|
return err; |
|
} |
|
|
|
if (c->ro_mount && !(*flags & SB_RDONLY)) { |
|
if (c->ro_error) { |
|
ubifs_msg(c, "cannot re-mount R/W due to prior errors"); |
|
return -EROFS; |
|
} |
|
if (c->ro_media) { |
|
ubifs_msg(c, "cannot re-mount R/W - UBI volume is R/O"); |
|
return -EROFS; |
|
} |
|
err = ubifs_remount_rw(c); |
|
if (err) |
|
return err; |
|
} else if (!c->ro_mount && (*flags & SB_RDONLY)) { |
|
if (c->ro_error) { |
|
ubifs_msg(c, "cannot re-mount R/O due to prior errors"); |
|
return -EROFS; |
|
} |
|
ubifs_remount_ro(c); |
|
} |
|
|
|
if (c->bulk_read == 1) |
|
bu_init(c); |
|
else { |
|
dbg_gen("disable bulk-read"); |
|
mutex_lock(&c->bu_mutex); |
|
kfree(c->bu.buf); |
|
c->bu.buf = NULL; |
|
mutex_unlock(&c->bu_mutex); |
|
} |
|
|
|
if (!c->need_recovery) |
|
ubifs_assert(c, c->lst.taken_empty_lebs > 0); |
|
|
|
return 0; |
|
} |
|
|
|
const struct super_operations ubifs_super_operations = { |
|
.alloc_inode = ubifs_alloc_inode, |
|
.free_inode = ubifs_free_inode, |
|
.put_super = ubifs_put_super, |
|
.write_inode = ubifs_write_inode, |
|
.drop_inode = ubifs_drop_inode, |
|
.evict_inode = ubifs_evict_inode, |
|
.statfs = ubifs_statfs, |
|
.dirty_inode = ubifs_dirty_inode, |
|
.remount_fs = ubifs_remount_fs, |
|
.show_options = ubifs_show_options, |
|
.sync_fs = ubifs_sync_fs, |
|
}; |
|
|
|
/** |
|
* open_ubi - parse UBI device name string and open the UBI device. |
|
* @name: UBI volume name |
|
* @mode: UBI volume open mode |
|
* |
|
* The primary method of mounting UBIFS is by specifying the UBI volume |
|
* character device node path. However, UBIFS may also be mounted withoug any |
|
* character device node using one of the following methods: |
|
* |
|
* o ubiX_Y - mount UBI device number X, volume Y; |
|
* o ubiY - mount UBI device number 0, volume Y; |
|
* o ubiX:NAME - mount UBI device X, volume with name NAME; |
|
* o ubi:NAME - mount UBI device 0, volume with name NAME. |
|
* |
|
* Alternative '!' separator may be used instead of ':' (because some shells |
|
* like busybox may interpret ':' as an NFS host name separator). This function |
|
* returns UBI volume description object in case of success and a negative |
|
* error code in case of failure. |
|
*/ |
|
static struct ubi_volume_desc *open_ubi(const char *name, int mode) |
|
{ |
|
struct ubi_volume_desc *ubi; |
|
int dev, vol; |
|
char *endptr; |
|
|
|
if (!name || !*name) |
|
return ERR_PTR(-EINVAL); |
|
|
|
/* First, try to open using the device node path method */ |
|
ubi = ubi_open_volume_path(name, mode); |
|
if (!IS_ERR(ubi)) |
|
return ubi; |
|
|
|
/* Try the "nodev" method */ |
|
if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i') |
|
return ERR_PTR(-EINVAL); |
|
|
|
/* ubi:NAME method */ |
|
if ((name[3] == ':' || name[3] == '!') && name[4] != '\0') |
|
return ubi_open_volume_nm(0, name + 4, mode); |
|
|
|
if (!isdigit(name[3])) |
|
return ERR_PTR(-EINVAL); |
|
|
|
dev = simple_strtoul(name + 3, &endptr, 0); |
|
|
|
/* ubiY method */ |
|
if (*endptr == '\0') |
|
return ubi_open_volume(0, dev, mode); |
|
|
|
/* ubiX_Y method */ |
|
if (*endptr == '_' && isdigit(endptr[1])) { |
|
vol = simple_strtoul(endptr + 1, &endptr, 0); |
|
if (*endptr != '\0') |
|
return ERR_PTR(-EINVAL); |
|
return ubi_open_volume(dev, vol, mode); |
|
} |
|
|
|
/* ubiX:NAME method */ |
|
if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0') |
|
return ubi_open_volume_nm(dev, ++endptr, mode); |
|
|
|
return ERR_PTR(-EINVAL); |
|
} |
|
|
|
static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi) |
|
{ |
|
struct ubifs_info *c; |
|
|
|
c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL); |
|
if (c) { |
|
spin_lock_init(&c->cnt_lock); |
|
spin_lock_init(&c->cs_lock); |
|
spin_lock_init(&c->buds_lock); |
|
spin_lock_init(&c->space_lock); |
|
spin_lock_init(&c->orphan_lock); |
|
init_rwsem(&c->commit_sem); |
|
mutex_init(&c->lp_mutex); |
|
mutex_init(&c->tnc_mutex); |
|
mutex_init(&c->log_mutex); |
|
mutex_init(&c->umount_mutex); |
|
mutex_init(&c->bu_mutex); |
|
mutex_init(&c->write_reserve_mutex); |
|
init_waitqueue_head(&c->cmt_wq); |
|
c->buds = RB_ROOT; |
|
c->old_idx = RB_ROOT; |
|
c->size_tree = RB_ROOT; |
|
c->orph_tree = RB_ROOT; |
|
INIT_LIST_HEAD(&c->infos_list); |
|
INIT_LIST_HEAD(&c->idx_gc); |
|
INIT_LIST_HEAD(&c->replay_list); |
|
INIT_LIST_HEAD(&c->replay_buds); |
|
INIT_LIST_HEAD(&c->uncat_list); |
|
INIT_LIST_HEAD(&c->empty_list); |
|
INIT_LIST_HEAD(&c->freeable_list); |
|
INIT_LIST_HEAD(&c->frdi_idx_list); |
|
INIT_LIST_HEAD(&c->unclean_leb_list); |
|
INIT_LIST_HEAD(&c->old_buds); |
|
INIT_LIST_HEAD(&c->orph_list); |
|
INIT_LIST_HEAD(&c->orph_new); |
|
c->no_chk_data_crc = 1; |
|
c->assert_action = ASSACT_RO; |
|
|
|
c->highest_inum = UBIFS_FIRST_INO; |
|
c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM; |
|
|
|
ubi_get_volume_info(ubi, &c->vi); |
|
ubi_get_device_info(c->vi.ubi_num, &c->di); |
|
} |
|
return c; |
|
} |
|
|
|
static int ubifs_fill_super(struct super_block *sb, void *data, int silent) |
|
{ |
|
struct ubifs_info *c = sb->s_fs_info; |
|
struct inode *root; |
|
int err; |
|
|
|
c->vfs_sb = sb; |
|
/* Re-open the UBI device in read-write mode */ |
|
c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE); |
|
if (IS_ERR(c->ubi)) { |
|
err = PTR_ERR(c->ubi); |
|
goto out; |
|
} |
|
|
|
err = ubifs_parse_options(c, data, 0); |
|
if (err) |
|
goto out_close; |
|
|
|
/* |
|
* UBIFS provides 'backing_dev_info' in order to disable read-ahead. For |
|
* UBIFS, I/O is not deferred, it is done immediately in readpage, |
|
* which means the user would have to wait not just for their own I/O |
|
* but the read-ahead I/O as well i.e. completely pointless. |
|
* |
|
* Read-ahead will be disabled because @sb->s_bdi->ra_pages is 0. Also |
|
* @sb->s_bdi->capabilities are initialized to 0 so there won't be any |
|
* writeback happening. |
|
*/ |
|
err = super_setup_bdi_name(sb, "ubifs_%d_%d", c->vi.ubi_num, |
|
c->vi.vol_id); |
|
if (err) |
|
goto out_close; |
|
sb->s_bdi->ra_pages = 0; |
|
sb->s_bdi->io_pages = 0; |
|
|
|
sb->s_fs_info = c; |
|
sb->s_magic = UBIFS_SUPER_MAGIC; |
|
sb->s_blocksize = UBIFS_BLOCK_SIZE; |
|
sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT; |
|
sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c); |
|
if (c->max_inode_sz > MAX_LFS_FILESIZE) |
|
sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE; |
|
sb->s_op = &ubifs_super_operations; |
|
#ifdef CONFIG_UBIFS_FS_XATTR |
|
sb->s_xattr = ubifs_xattr_handlers; |
|
#endif |
|
fscrypt_set_ops(sb, &ubifs_crypt_operations); |
|
|
|
mutex_lock(&c->umount_mutex); |
|
err = mount_ubifs(c); |
|
if (err) { |
|
ubifs_assert(c, err < 0); |
|
goto out_unlock; |
|
} |
|
|
|
/* Read the root inode */ |
|
root = ubifs_iget(sb, UBIFS_ROOT_INO); |
|
if (IS_ERR(root)) { |
|
err = PTR_ERR(root); |
|
goto out_umount; |
|
} |
|
|
|
sb->s_root = d_make_root(root); |
|
if (!sb->s_root) { |
|
err = -ENOMEM; |
|
goto out_umount; |
|
} |
|
|
|
mutex_unlock(&c->umount_mutex); |
|
return 0; |
|
|
|
out_umount: |
|
ubifs_umount(c); |
|
out_unlock: |
|
mutex_unlock(&c->umount_mutex); |
|
out_close: |
|
ubifs_release_options(c); |
|
ubi_close_volume(c->ubi); |
|
out: |
|
return err; |
|
} |
|
|
|
static int sb_test(struct super_block *sb, void *data) |
|
{ |
|
struct ubifs_info *c1 = data; |
|
struct ubifs_info *c = sb->s_fs_info; |
|
|
|
return c->vi.cdev == c1->vi.cdev; |
|
} |
|
|
|
static int sb_set(struct super_block *sb, void *data) |
|
{ |
|
sb->s_fs_info = data; |
|
return set_anon_super(sb, NULL); |
|
} |
|
|
|
static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags, |
|
const char *name, void *data) |
|
{ |
|
struct ubi_volume_desc *ubi; |
|
struct ubifs_info *c; |
|
struct super_block *sb; |
|
int err; |
|
|
|
dbg_gen("name %s, flags %#x", name, flags); |
|
|
|
/* |
|
* Get UBI device number and volume ID. Mount it read-only so far |
|
* because this might be a new mount point, and UBI allows only one |
|
* read-write user at a time. |
|
*/ |
|
ubi = open_ubi(name, UBI_READONLY); |
|
if (IS_ERR(ubi)) { |
|
if (!(flags & SB_SILENT)) |
|
pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d", |
|
current->pid, name, (int)PTR_ERR(ubi)); |
|
return ERR_CAST(ubi); |
|
} |
|
|
|
c = alloc_ubifs_info(ubi); |
|
if (!c) { |
|
err = -ENOMEM; |
|
goto out_close; |
|
} |
|
|
|
dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id); |
|
|
|
sb = sget(fs_type, sb_test, sb_set, flags, c); |
|
if (IS_ERR(sb)) { |
|
err = PTR_ERR(sb); |
|
kfree(c); |
|
goto out_close; |
|
} |
|
|
|
if (sb->s_root) { |
|
struct ubifs_info *c1 = sb->s_fs_info; |
|
kfree(c); |
|
/* A new mount point for already mounted UBIFS */ |
|
dbg_gen("this ubi volume is already mounted"); |
|
if (!!(flags & SB_RDONLY) != c1->ro_mount) { |
|
err = -EBUSY; |
|
goto out_deact; |
|
} |
|
} else { |
|
err = ubifs_fill_super(sb, data, flags & SB_SILENT ? 1 : 0); |
|
if (err) |
|
goto out_deact; |
|
/* We do not support atime */ |
|
sb->s_flags |= SB_ACTIVE; |
|
if (IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT)) |
|
ubifs_msg(c, "full atime support is enabled."); |
|
else |
|
sb->s_flags |= SB_NOATIME; |
|
} |
|
|
|
/* 'fill_super()' opens ubi again so we must close it here */ |
|
ubi_close_volume(ubi); |
|
|
|
return dget(sb->s_root); |
|
|
|
out_deact: |
|
deactivate_locked_super(sb); |
|
out_close: |
|
ubi_close_volume(ubi); |
|
return ERR_PTR(err); |
|
} |
|
|
|
static void kill_ubifs_super(struct super_block *s) |
|
{ |
|
struct ubifs_info *c = s->s_fs_info; |
|
kill_anon_super(s); |
|
kfree(c); |
|
} |
|
|
|
static struct file_system_type ubifs_fs_type = { |
|
.name = "ubifs", |
|
.owner = THIS_MODULE, |
|
.mount = ubifs_mount, |
|
.kill_sb = kill_ubifs_super, |
|
}; |
|
MODULE_ALIAS_FS("ubifs"); |
|
|
|
/* |
|
* Inode slab cache constructor. |
|
*/ |
|
static void inode_slab_ctor(void *obj) |
|
{ |
|
struct ubifs_inode *ui = obj; |
|
inode_init_once(&ui->vfs_inode); |
|
} |
|
|
|
static int __init ubifs_init(void) |
|
{ |
|
int err; |
|
|
|
BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24); |
|
|
|
/* Make sure node sizes are 8-byte aligned */ |
|
BUILD_BUG_ON(UBIFS_CH_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7); |
|
|
|
BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7); |
|
BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7); |
|
BUILD_BUG_ON(MIN_WRITE_SZ & 7); |
|
|
|
/* Check min. node size */ |
|
BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ); |
|
BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ); |
|
BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ); |
|
BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ); |
|
|
|
BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ); |
|
BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ); |
|
BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ); |
|
BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ); |
|
|
|
/* Defined node sizes */ |
|
BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096); |
|
BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512); |
|
BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160); |
|
BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64); |
|
|
|
/* |
|
* We use 2 bit wide bit-fields to store compression type, which should |
|
* be amended if more compressors are added. The bit-fields are: |
|
* @compr_type in 'struct ubifs_inode', @default_compr in |
|
* 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'. |
|
*/ |
|
BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4); |
|
|
|
/* |
|
* We require that PAGE_SIZE is greater-than-or-equal-to |
|
* UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2. |
|
*/ |
|
if (PAGE_SIZE < UBIFS_BLOCK_SIZE) { |
|
pr_err("UBIFS error (pid %d): VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes", |
|
current->pid, (unsigned int)PAGE_SIZE); |
|
return -EINVAL; |
|
} |
|
|
|
ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab", |
|
sizeof(struct ubifs_inode), 0, |
|
SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT | |
|
SLAB_ACCOUNT, &inode_slab_ctor); |
|
if (!ubifs_inode_slab) |
|
return -ENOMEM; |
|
|
|
err = register_shrinker(&ubifs_shrinker_info); |
|
if (err) |
|
goto out_slab; |
|
|
|
err = ubifs_compressors_init(); |
|
if (err) |
|
goto out_shrinker; |
|
|
|
dbg_debugfs_init(); |
|
|
|
err = register_filesystem(&ubifs_fs_type); |
|
if (err) { |
|
pr_err("UBIFS error (pid %d): cannot register file system, error %d", |
|
current->pid, err); |
|
goto out_dbg; |
|
} |
|
return 0; |
|
|
|
out_dbg: |
|
dbg_debugfs_exit(); |
|
ubifs_compressors_exit(); |
|
out_shrinker: |
|
unregister_shrinker(&ubifs_shrinker_info); |
|
out_slab: |
|
kmem_cache_destroy(ubifs_inode_slab); |
|
return err; |
|
} |
|
/* late_initcall to let compressors initialize first */ |
|
late_initcall(ubifs_init); |
|
|
|
static void __exit ubifs_exit(void) |
|
{ |
|
WARN_ON(!list_empty(&ubifs_infos)); |
|
WARN_ON(atomic_long_read(&ubifs_clean_zn_cnt) != 0); |
|
|
|
dbg_debugfs_exit(); |
|
ubifs_compressors_exit(); |
|
unregister_shrinker(&ubifs_shrinker_info); |
|
|
|
/* |
|
* Make sure all delayed rcu free inodes are flushed before we |
|
* destroy cache. |
|
*/ |
|
rcu_barrier(); |
|
kmem_cache_destroy(ubifs_inode_slab); |
|
unregister_filesystem(&ubifs_fs_type); |
|
} |
|
module_exit(ubifs_exit); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_VERSION(__stringify(UBIFS_VERSION)); |
|
MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter"); |
|
MODULE_DESCRIPTION("UBIFS - UBI File System");
|
|
|