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u-boot/fs/ubifs/super.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

2708 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
* 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.
*/
#ifndef __UBOOT__
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/kthread.h>
#include <linux/parser.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/math64.h>
#include <linux/writeback.h>
#else
#include <common.h>
#include <malloc.h>
#include <memalign.h>
#include <linux/bug.h>
#include <linux/log2.h>
#include <linux/stat.h>
#include <linux/err.h>
#include "ubifs.h"
#include <ubi_uboot.h>
#include <mtd/ubi-user.h>
struct dentry;
struct file;
struct iattr;
struct kstat;
struct vfsmount;
#define INODE_LOCKED_MAX 64
struct super_block *ubifs_sb;
static struct inode *inodes_locked_down[INODE_LOCKED_MAX];
int set_anon_super(struct super_block *s, void *data)
{
return 0;
}
struct inode *iget_locked(struct super_block *sb, unsigned long ino)
{
struct inode *inode;
inode = (struct inode *)malloc_cache_aligned(
sizeof(struct ubifs_inode));
if (inode) {
inode->i_ino = ino;
inode->i_sb = sb;
list_add(&inode->i_sb_list, &sb->s_inodes);
inode->i_state = I_LOCK | I_NEW;
}
return inode;
}
void iget_failed(struct inode *inode)
{
}
int ubifs_iput(struct inode *inode)
{
list_del_init(&inode->i_sb_list);
free(inode);
return 0;
}
/*
* Lock (save) inode in inode array for readback after recovery
*/
void iput(struct inode *inode)
{
int i;
struct inode *ino;
/*
* Search end of list
*/
for (i = 0; i < INODE_LOCKED_MAX; i++) {
if (inodes_locked_down[i] == NULL)
break;
}
if (i >= INODE_LOCKED_MAX) {
dbg_gen("Error, can't lock (save) more inodes while recovery!!!");
return;
}
/*
* Allocate and use new inode
*/
ino = (struct inode *)malloc_cache_aligned(sizeof(struct ubifs_inode));
memcpy(ino, inode, sizeof(struct ubifs_inode));
/*
* Finally save inode in array
*/
inodes_locked_down[i] = ino;
}
/* from fs/inode.c */
/**
* clear_nlink - directly zero an inode's link count
* @inode: inode
*
* This is a low-level filesystem helper to replace any
* direct filesystem manipulation of i_nlink. See
* drop_nlink() for why we care about i_nlink hitting zero.
*/
void clear_nlink(struct inode *inode)
{
if (inode->i_nlink) {
inode->__i_nlink = 0;
atomic_long_inc(&inode->i_sb->s_remove_count);
}
}
EXPORT_SYMBOL(clear_nlink);
/**
* set_nlink - directly set an inode's link count
* @inode: inode
* @nlink: new nlink (should be non-zero)
*
* This is a low-level filesystem helper to replace any
* direct filesystem manipulation of i_nlink.
*/
void set_nlink(struct inode *inode, unsigned int nlink)
{
if (!nlink) {
clear_nlink(inode);
} else {
/* Yes, some filesystems do change nlink from zero to one */
if (inode->i_nlink == 0)
atomic_long_dec(&inode->i_sb->s_remove_count);
inode->__i_nlink = nlink;
}
}
EXPORT_SYMBOL(set_nlink);
/* from include/linux/fs.h */
static inline void i_uid_write(struct inode *inode, uid_t uid)
{
inode->i_uid.val = uid;
}
static inline void i_gid_write(struct inode *inode, gid_t gid)
{
inode->i_gid.val = gid;
}
void unlock_new_inode(struct inode *inode)
{
return;
}
#endif
/*
* Maximum amount of memory we may 'kmalloc()' without worrying that we are
* allocating too much.
*/
#define UBIFS_KMALLOC_OK (128*1024)
/* Slab cache for UBIFS inodes */
struct kmem_cache *ubifs_inode_slab;
#ifndef __UBOOT__
/* UBIFS TNC shrinker description */
static struct shrinker ubifs_shrinker_info = {
.scan_objects = ubifs_shrink_scan,
.count_objects = ubifs_shrink_count,
.seeks = DEFAULT_SEEKS,
};
#endif
/**
* validate_inode - validate inode.
* @c: UBIFS file-system description object
* @inode: the inode to validate
*
* 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.
*/
static int validate_inode(struct ubifs_info *c, const struct inode *inode)
{
int err;
const struct ubifs_inode *ui = ubifs_inode(inode);
if (inode->i_size > c->max_inode_sz) {
ubifs_err(c, "inode is too large (%lld)",
(long long)inode->i_size);
return 1;
}
if (ui->compr_type >= UBIFS_COMPR_TYPES_CNT) {
ubifs_err(c, "unknown compression type %d", ui->compr_type);
return 2;
}
if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX)
return 3;
if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA)
return 4;
if (ui->xattr && !S_ISREG(inode->i_mode))
return 5;
if (!ubifs_compr_present(ui->compr_type)) {
ubifs_warn(c, "inode %lu uses '%s' compression, but it was not compiled in",
inode->i_ino, ubifs_compr_name(ui->compr_type));
}
err = dbg_check_dir(c, inode);
return err;
}
struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
{
int err;
union ubifs_key key;
struct ubifs_ino_node *ino;
struct ubifs_info *c = sb->s_fs_info;
struct inode *inode;
struct ubifs_inode *ui;
#ifdef __UBOOT__
int i;
#endif
dbg_gen("inode %lu", inum);
#ifdef __UBOOT__
/*
* U-Boot special handling of locked down inodes via recovery
* e.g. ubifs_recover_size()
*/
for (i = 0; i < INODE_LOCKED_MAX; i++) {
/*
* Exit on last entry (NULL), inode not found in list
*/
if (inodes_locked_down[i] == NULL)
break;
if (inodes_locked_down[i]->i_ino == inum) {
/*
* We found the locked down inode in our array,
* so just return this pointer instead of creating
* a new one.
*/
return inodes_locked_down[i];
}
}
#endif
inode = iget_locked(sb, inum);
if (!inode)
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
return inode;
ui = ubifs_inode(inode);
ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
if (!ino) {
err = -ENOMEM;
goto out;
}
ino_key_init(c, &key, inode->i_ino);
err = ubifs_tnc_lookup(c, &key, ino);
if (err)
goto out_ino;
inode->i_flags |= (S_NOCMTIME | S_NOATIME);
set_nlink(inode, le32_to_cpu(ino->nlink));
i_uid_write(inode, le32_to_cpu(ino->uid));
i_gid_write(inode, le32_to_cpu(ino->gid));
inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec);
inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec);
inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec);
inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec);
inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec);
inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec);
inode->i_mode = le32_to_cpu(ino->mode);
inode->i_size = le64_to_cpu(ino->size);
ui->data_len = le32_to_cpu(ino->data_len);
ui->flags = le32_to_cpu(ino->flags);
ui->compr_type = le16_to_cpu(ino->compr_type);
ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
ui->xattr_size = le32_to_cpu(ino->xattr_size);
ui->xattr_names = le32_to_cpu(ino->xattr_names);
ui->synced_i_size = ui->ui_size = inode->i_size;
ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0;
err = validate_inode(c, inode);
if (err)
goto out_invalid;
#ifndef __UBOOT__
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
inode->i_mapping->a_ops = &ubifs_file_address_operations;
inode->i_op = &ubifs_file_inode_operations;
inode->i_fop = &ubifs_file_operations;
if (ui->xattr) {
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';
} else if (ui->data_len != 0) {
err = 10;
goto out_invalid;
}
break;
case S_IFDIR:
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:
inode->i_op = &ubifs_symlink_inode_operations;
if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
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';
inode->i_link = ui->data;
break;
case S_IFBLK:
case S_IFCHR:
{
dev_t rdev;
union ubifs_dev_desc *dev;
ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
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));
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;
init_special_inode(inode, inode->i_mode, 0);
if (ui->data_len != 0) {
err = 14;
goto out_invalid;
}
break;
default:
err = 15;
goto out_invalid;
}
#else
if ((inode->i_mode & S_IFMT) == S_IFLNK) {
if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
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';
}
#endif
kfree(ino);
#ifndef __UBOOT__
ubifs_set_inode_flags(inode);
#endif
unlock_new_inode(inode);
return inode;
out_invalid:
ubifs_err(c, "inode %lu validation failed, error %d", inode->i_ino, err);
ubifs_dump_node(c, ino);
ubifs_dump_inode(c, inode);
err = -EINVAL;
out_ino:
kfree(ino);
out:
ubifs_err(c, "failed to read inode %lu, error %d", inode->i_ino, err);
iget_failed(inode);
return ERR_PTR(err);
}
static struct inode *ubifs_alloc_inode(struct super_block *sb)
{
struct ubifs_inode *ui;
ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS);
if (!ui)
return NULL;
memset((void *)ui + sizeof(struct inode), 0,
sizeof(struct ubifs_inode) - sizeof(struct inode));
mutex_init(&ui->ui_mutex);
spin_lock_init(&ui->ui_lock);
return &ui->vfs_inode;
};
#ifndef __UBOOT__
static void ubifs_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
struct ubifs_inode *ui = ubifs_inode(inode);
kmem_cache_free(ubifs_inode_slab, ui);
}
static void ubifs_destroy_inode(struct inode *inode)
{
struct ubifs_inode *ui = ubifs_inode(inode);
kfree(ui->data);
call_rcu(&inode->i_rcu, ubifs_i_callback);
}
/*
* Note, Linux write-back code calls this without 'i_mutex'.
*/
static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
int err = 0;
struct ubifs_info *c = inode->i_sb->s_fs_info;
struct ubifs_inode *ui = ubifs_inode(inode);
ubifs_assert(!ui->xattr);
if (is_bad_inode(inode))
return 0;
mutex_lock(&ui->ui_mutex);
/*
* Due to races between write-back forced by budgeting
* (see 'sync_some_inodes()') and background write-back, the inode may
* have already been synchronized, do not do this again. This might
* also happen if it was synchronized in an VFS operation, e.g.
* 'ubifs_link()'.
*/
if (!ui->dirty) {
mutex_unlock(&ui->ui_mutex);
return 0;
}
/*
* As an optimization, do not write orphan inodes to the media just
* because this is not needed.
*/
dbg_gen("inode %lu, mode %#x, nlink %u",
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",
inode->i_ino, err);
else
err = dbg_check_inode_size(c, inode, ui->ui_size);
}
ui->dirty = 0;
mutex_unlock(&ui->ui_mutex);
ubifs_release_dirty_inode_budget(c, ui);
return err;
}
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(!atomic_read(&inode->i_count));
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);
}
#endif
static void ubifs_dirty_inode(struct inode *inode, int flags)
{
struct ubifs_inode *ui = ubifs_inode(inode);
ubifs_assert(mutex_is_locked(&ui->ui_mutex));
if (!ui->dirty) {
ui->dirty = 1;
dbg_gen("inode %lu", inode->i_ino);
}
}
#ifndef __UBOOT__
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(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->mount_opts.compr_type));
}
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);
}
#endif
/**
* 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_err(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_err(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_err(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_err(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_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;
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;
}
/*
* 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;
}
/**
* 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);
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_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_err,
};
#ifndef __UBOOT__
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_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 MS_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 {
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;
}
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;
}
#endif
/**
* 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->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;
}
}
#ifndef __UBOOT__
/**
* 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->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;
}
#endif
/**
* 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;
#ifndef CONFIG_UBIFS_SILENCE_MSG
long long y;
#endif
size_t sz;
c->ro_mount = !!(c->vfs_sb->s_flags & MS_RDONLY);
/* Suppress error messages while probing if MS_SILENT is set */
c->probing = !!(c->vfs_sb->s_flags & MS_SILENT);
#ifdef __UBOOT__
if (!c->ro_mount) {
printf("UBIFS: only ro mode in U-Boot allowed.\n");
return -EACCES;
}
#endif
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(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;
#ifndef __UBOOT__
if (!c->ro_mount) {
c->ileb_buf = vmalloc(c->leb_size);
if (!c->ileb_buf)
goto out_free;
}
#endif
if (c->bulk_read == 1)
bu_init(c);
#ifndef __UBOOT__
if (!c->ro_mount) {
c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ,
GFP_KERNEL);
if (!c->write_reserve_buf)
goto out_free;
}
#endif
c->mounting = 1;
err = ubifs_read_superblock(c);
if (err)
goto out_free;
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->default_compr)) {
ubifs_err(c, "'compressor \"%s\" is not compiled in",
ubifs_compr_name(c->default_compr));
err = -ENOTSUPP;
goto out_free;
}
err = init_constants_sb(c);
if (err)
goto out_free;
sz = ALIGN(c->max_idx_node_sz, c->min_io_size);
sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size);
c->cbuf = kmalloc(sz, GFP_NOFS);
if (!c->cbuf) {
err = -ENOMEM;
goto out_free;
}
err = alloc_wbufs(c);
if (err)
goto out_cbuf;
sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
#ifndef __UBOOT__
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);
}
#endif
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;
}
#ifndef __UBOOT__
if (c->need_recovery && !c->ro_mount) {
err = ubifs_recover_inl_heads(c, c->sbuf);
if (err)
goto out_master;
}
#endif
err = ubifs_lpt_init(c, 1, !c->ro_mount);
if (err)
goto out_master;
#ifndef __UBOOT__
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;
}
#endif
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) {
#ifndef __UBOOT__
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) {
err = ubifs_recover_size(c);
if (err)
goto out_orphans;
err = ubifs_rcvry_gc_commit(c);
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;
#endif
} else if (c->need_recovery) {
err = ubifs_recover_size(c);
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;
}
#ifndef __UBOOT__
spin_lock(&ubifs_infos_lock);
list_add_tail(&c->infos_list, &ubifs_infos);
spin_unlock(&ubifs_infos_lock);
#endif
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->lst.taken_empty_lebs > 0);
}
} else
ubifs_assert(c->lst.taken_empty_lebs > 0);
err = dbg_check_filesystem(c);
if (err)
goto out_infos;
err = dbg_debugfs_init_fs(c);
if (err)
goto out_infos;
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;
#ifndef CONFIG_UBIFS_SILENCE_MSG
y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
#endif
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->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);
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);
#ifndef __UBOOT__
out_wbufs:
#endif
free_wbufs(c);
out_cbuf:
kfree(c->cbuf);
out_free:
kfree(c->write_reserve_buf);
kfree(c->bu.buf);
vfree(c->ileb_buf);
vfree(c->sbuf);
kfree(c->bottom_up_buf);
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.
*/
#ifndef __UBOOT__
static void ubifs_umount(struct ubifs_info *c)
#else
void ubifs_umount(struct ubifs_info *c)
#endif
{
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);
#ifndef __UBOOT__
if (c->bgt)
kthread_stop(c->bgt);
destroy_journal(c);
#endif
free_wbufs(c);
free_orphans(c);
ubifs_lpt_free(c, 0);
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);
ubifs_debugging_exit(c);
#ifdef __UBOOT__
/* Finally free U-Boot's global copy of superblock */
if (ubifs_sb != NULL) {
free(ubifs_sb->s_fs_info);
free(ubifs_sb);
}
#endif
}
#ifndef __UBOOT__
/**
* 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->old_leb_cnt != c->leb_cnt) {
struct ubifs_sb_node *sup;
sup = ubifs_read_sb_node(c);
if (IS_ERR(sup)) {
err = PTR_ERR(sup);
goto out;
}
sup->leb_cnt = cpu_to_le32(c->leb_cnt);
err = ubifs_write_sb_node(c, sup);
kfree(sup);
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;
err = ubifs_recover_size(c);
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->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;
}
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, 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);
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->need_recovery);
ubifs_assert(!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++)
ubifs_wbuf_sync(&c->jheads[i].wbuf);
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->bi.idx_growth == 0);
ubifs_assert(c->bi.dd_growth == 0);
ubifs_assert(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++)
ubifs_wbuf_sync(&c->jheads[i].wbuf);
/*
* 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 {
#ifndef __UBOOT__
for (i = 0; i < c->jhead_cnt; i++)
/* Make sure write-buffer timers are canceled */
hrtimer_cancel(&c->jheads[i].wbuf.timer);
#endif
}
}
ubifs_umount(c);
#ifndef __UBOOT__
bdi_destroy(&c->bdi);
#endif
ubi_close_volume(c->ubi);
mutex_unlock(&c->umount_mutex);
}
#endif
#ifndef __UBOOT__
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 & MS_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 & MS_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");
kfree(c->bu.buf);
c->bu.buf = NULL;
}
ubifs_assert(c->lst.taken_empty_lebs > 0);
return 0;
}
#endif
const struct super_operations ubifs_super_operations = {
.alloc_inode = ubifs_alloc_inode,
#ifndef __UBOOT__
.destroy_inode = ubifs_destroy_inode,
.put_super = ubifs_put_super,
.write_inode = ubifs_write_inode,
.evict_inode = ubifs_evict_inode,
.statfs = ubifs_statfs,
#endif
.dirty_inode = ubifs_dirty_inode,
#ifndef __UBOOT__
.remount_fs = ubifs_remount_fs,
.show_options = ubifs_show_options,
.sync_fs = ubifs_sync_fs,
#endif
};
/**
* 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)
{
#ifndef __UBOOT__
struct ubi_volume_desc *ubi;
#endif
int dev, vol;
char *endptr;
#ifndef __UBOOT__
/* First, try to open using the device node path method */
ubi = ubi_open_volume_path(name, mode);
if (!IS_ERR(ubi))
return ubi;
#endif
/* 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->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;
#ifndef __UBOOT__
/* Re-open the UBI device in read-write mode */
c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
#else
/* U-Boot read only mode */
c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
#endif
if (IS_ERR(c->ubi)) {
err = PTR_ERR(c->ubi);
goto out;
}
#ifndef __UBOOT__
/*
* 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 @c->bdi.ra_pages is 0.
*/
c->bdi.name = "ubifs",
c->bdi.capabilities = 0;
err = bdi_init(&c->bdi);
if (err)
goto out_close;
err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d",
c->vi.ubi_num, c->vi.vol_id);
if (err)
goto out_bdi;
err = ubifs_parse_options(c, data, 0);
if (err)
goto out_bdi;
sb->s_bdi = &c->bdi;
#endif
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;
#ifndef __UBOOT__
sb->s_xattr = ubifs_xattr_handlers;
#endif
mutex_lock(&c->umount_mutex);
err = mount_ubifs(c);
if (err) {
ubifs_assert(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;
}
#ifndef __UBOOT__
sb->s_root = d_make_root(root);
if (!sb->s_root) {
err = -ENOMEM;
goto out_umount;
}
#else
sb->s_root = NULL;
#endif
mutex_unlock(&c->umount_mutex);
return 0;
out_umount:
ubifs_umount(c);
out_unlock:
mutex_unlock(&c->umount_mutex);
#ifndef __UBOOT__
out_bdi:
bdi_destroy(&c->bdi);
out_close:
#endif
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 super_block *alloc_super(struct file_system_type *type, int flags)
{
struct super_block *s;
int err;
s = kzalloc(sizeof(struct super_block), GFP_USER);
if (!s) {
err = -ENOMEM;
return ERR_PTR(err);
}
INIT_HLIST_NODE(&s->s_instances);
INIT_LIST_HEAD(&s->s_inodes);
s->s_time_gran = 1000000000;
s->s_flags = flags;
return s;
}
/**
* sget - find or create a superblock
* @type: filesystem type superblock should belong to
* @test: comparison callback
* @set: setup callback
* @flags: mount flags
* @data: argument to each of them
*/
struct super_block *sget(struct file_system_type *type,
int (*test)(struct super_block *,void *),
int (*set)(struct super_block *,void *),
int flags,
void *data)
{
struct super_block *s = NULL;
#ifndef __UBOOT__
struct super_block *old;
#endif
int err;
#ifndef __UBOOT__
retry:
spin_lock(&sb_lock);
if (test) {
hlist_for_each_entry(old, &type->fs_supers, s_instances) {
if (!test(old, data))
continue;
if (!grab_super(old))
goto retry;
if (s) {
up_write(&s->s_umount);
destroy_super(s);
s = NULL;
}
return old;
}
}
#endif
if (!s) {
spin_unlock(&sb_lock);
s = alloc_super(type, flags);
if (!s)
return ERR_PTR(-ENOMEM);
#ifndef __UBOOT__
goto retry;
#endif
}
err = set(s, data);
if (err) {
#ifndef __UBOOT__
spin_unlock(&sb_lock);
up_write(&s->s_umount);
destroy_super(s);
#endif
return ERR_PTR(err);
}
s->s_type = type;
#ifndef __UBOOT__
strlcpy(s->s_id, type->name, sizeof(s->s_id));
list_add_tail(&s->s_list, &super_blocks);
#else
strncpy(s->s_id, type->name, sizeof(s->s_id));
#endif
hlist_add_head(&s->s_instances, &type->fs_supers);
#ifndef __UBOOT__
spin_unlock(&sb_lock);
get_filesystem(type);
register_shrinker(&s->s_shrink);
#endif
return s;
}
EXPORT_SYMBOL(sget);
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)) {
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 & MS_RDONLY) != c1->ro_mount) {
err = -EBUSY;
goto out_deact;
}
} else {
err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
if (err)
goto out_deact;
/* We do not support atime */
sb->s_flags |= MS_ACTIVE | MS_NOATIME;
}
/* 'fill_super()' opens ubi again so we must close it here */
ubi_close_volume(ubi);
#ifdef __UBOOT__
ubifs_sb = sb;
return 0;
#else
return dget(sb->s_root);
#endif
out_deact:
#ifndef __UBOOT__
deactivate_locked_super(sb);
#endif
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;
#ifndef __UBOOT__
kill_anon_super(s);
#endif
kfree(c);
}
static struct file_system_type ubifs_fs_type = {
.name = "ubifs",
.owner = THIS_MODULE,
.mount = ubifs_mount,
.kill_sb = kill_ubifs_super,
};
#ifndef __UBOOT__
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)
#else
int ubifs_init(void)
#endif
{
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_CACHE_SIZE is greater-than-or-equal-to
* UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2.
*/
if (PAGE_CACHE_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_CACHE_SIZE);
return -EINVAL;
}
#ifndef __UBOOT__
ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab",
sizeof(struct ubifs_inode), 0,
SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT,
&inode_slab_ctor);
if (!ubifs_inode_slab)
return -ENOMEM;
err = register_shrinker(&ubifs_shrinker_info);
if (err)
goto out_slab;
#endif
err = ubifs_compressors_init();
if (err)
goto out_shrinker;
#ifndef __UBOOT__
err = dbg_debugfs_init();
if (err)
goto out_compr;
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;
}
#endif
return 0;
#ifndef __UBOOT__
out_dbg:
dbg_debugfs_exit();
out_compr:
ubifs_compressors_exit();
#endif
out_shrinker:
#ifndef __UBOOT__
unregister_shrinker(&ubifs_shrinker_info);
out_slab:
#endif
kmem_cache_destroy(ubifs_inode_slab);
return err;
}
/* late_initcall to let compressors initialize first */
late_initcall(ubifs_init);
#ifndef __UBOOT__
static void __exit ubifs_exit(void)
{
ubifs_assert(list_empty(&ubifs_infos));
ubifs_assert(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");
#else
int uboot_ubifs_mount(char *vol_name)
{
struct dentry *ret;
int flags;
/*
* First unmount if allready mounted
*/
if (ubifs_sb)
ubifs_umount(ubifs_sb->s_fs_info);
/*
* Mount in read-only mode
*/
flags = MS_RDONLY;
ret = ubifs_mount(&ubifs_fs_type, flags, vol_name, NULL);
if (IS_ERR(ret)) {
printf("Error reading superblock on volume '%s' " \
"errno=%d!\n", vol_name, (int)PTR_ERR(ret));
return -1;
}
return 0;
}
#endif
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