[RFC PATCH mtd-utils 035/110] ubifs-utils: Adapt super.c in libubifs
Zhihao Cheng
chengzhihao1 at huawei.com
Thu Jun 6 21:25:00 PDT 2024
Adapt super.c in libubifs, compared with linux kernel implementations:
1. It contains all definitions in common/super.c(Message printing
functions are replaced with linux kernel styles).
2. Remove some functions(eg. ubifs_iget, ubifs_dirty_inode) which won't
be used in fsck/mkfs.
3. Remove unused variables initialization in some functions(eg.
init_constants_early, init_constants_sb).
Signed-off-by: Zhihao Cheng <chengzhihao1 at huawei.com>
---
ubifs-utils/libubifs/super.c | 2219 ++++--------------------------------------
1 file changed, 177 insertions(+), 2042 deletions(-)
diff --git a/ubifs-utils/libubifs/super.c b/ubifs-utils/libubifs/super.c
index 09e270d6..1cbbfcac 100644
--- a/ubifs-utils/libubifs/super.c
+++ b/ubifs-utils/libubifs/super.c
@@ -14,487 +14,190 @@
* corresponding subsystems, but most of it is here.
*/
-#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>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "linux_err.h"
+#include "bitops.h"
+#include "kmem.h"
#include "ubifs.h"
+#include "defs.h"
+#include "debug.h"
+#include "key.h"
+#include "misc.h"
-static int ubifs_default_version_set(const char *val, const struct kernel_param *kp)
-{
- int n = 0, ret;
-
- ret = kstrtoint(val, 10, &n);
- if (ret != 0 || n < 4 || n > UBIFS_FORMAT_VERSION)
- return -EINVAL;
- return param_set_int(val, kp);
-}
-
-static const struct kernel_param_ops ubifs_default_version_ops = {
- .set = ubifs_default_version_set,
- .get = param_get_int,
-};
-
-int ubifs_default_version = UBIFS_FORMAT_VERSION;
-module_param_cb(default_version, &ubifs_default_version_ops, &ubifs_default_version, 0600);
-
-/*
- * 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 */
-static struct kmem_cache *ubifs_inode_slab;
-
-/* UBIFS TNC shrinker description */
-static struct shrinker *ubifs_shrinker_info;
+atomic_long_t ubifs_clean_zn_cnt;
+static const int default_debug_level = WARN_LEVEL;
/**
- * validate_inode - validate inode.
- * @c: UBIFS file-system description object
- * @inode: the inode to validate
+ * open_ubi - open the libubi.
+ * @c: the UBIFS file-system description object
+ * @node: name of the UBI volume character device to fetch information about
*
- * 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.
+ * This function opens libubi, and initialize device & volume information
+ * according to @node. Returns %0 in case of success and %-1 in case of failure.
*/
-static int validate_inode(struct ubifs_info *c, const struct inode *inode)
+int open_ubi(struct ubifs_info *c, const char *node)
{
- 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;
+ struct stat st;
- if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA)
- return 4;
+ if (stat(node, &st) || !S_ISCHR(st.st_mode))
+ return -1;
- if (ui->xattr && !S_ISREG(inode->i_mode))
- return 5;
+ c->libubi = libubi_open();
+ if (!c->libubi)
+ return -1;
+ if (ubi_get_vol_info(c->libubi, node, &c->vi))
+ goto out_err;
+ if (ubi_get_dev_info1(c->libubi, c->vi.dev_num, &c->di))
+ goto out_err;
- if (!ubifs_compr_present(c, ui->compr_type)) {
- ubifs_warn(c, "inode %lu uses '%s' compression, but it was not compiled in",
- inode->i_ino, ubifs_compr_name(c, ui->compr_type));
- }
+ return 0;
- err = dbg_check_dir(c, inode);
- return err;
+out_err:
+ close_ubi(c);
+ return -1;
}
-struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
+void close_ubi(struct ubifs_info *c)
{
- 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;
-
- dbg_gen("inode %lu", inum);
-
- 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;
+ if (c->libubi) {
+ libubi_close(c->libubi);
+ c->libubi = NULL;
}
+}
- ino_key_init(c, &key, inode->i_ino);
+/**
+ * open_target - open the output target.
+ * @c: the UBIFS file-system description object
+ *
+ * Open the output target. The target can be an UBI volume
+ * or a file.
+ *
+ * Returns %0 in case of success and a negative error code in case of failure.
+ */
+int open_target(struct ubifs_info *c)
+{
+ if (c->libubi) {
+ c->dev_fd = open(c->dev_name, O_RDWR | O_EXCL);
- err = ubifs_tnc_lookup(c, &key, ino);
- if (err)
- goto out_ino;
-
- inode->i_flags |= S_NOCMTIME;
-
- if (!IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT))
- inode->i_flags |= 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_set_atime(inode, (int64_t)le64_to_cpu(ino->atime_sec),
- le32_to_cpu(ino->atime_nsec));
- inode_set_mtime(inode, (int64_t)le64_to_cpu(ino->mtime_sec),
- le32_to_cpu(ino->mtime_nsec));
- inode_set_ctime(inode, (int64_t)le64_to_cpu(ino->ctime_sec),
- 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;
-
- 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;
+ if (c->dev_fd == -1) {
+ ubifs_err(c, "cannot open the UBI volume. %s",
+ strerror(errno));
+ return -errno;
}
- 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';
- 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;
+ if (ubi_set_property(c->dev_fd, UBI_VOL_PROP_DIRECT_WRITE, 1)) {
+ close(c->dev_fd);
+ ubifs_err(c, "ubi_set_property(set direct_write) failed. %s",
+ strerror(errno));
+ return -errno;
}
-
- 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;
+ } else {
+ c->dev_fd = open(c->dev_name, O_CREAT | O_RDWR | O_TRUNC,
+ S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
+ if (c->dev_fd == -1) {
+ ubifs_err(c, "cannot create output file. %s",
+ strerror(errno));
+ return -errno;
}
- break;
- default:
- err = 15;
- goto out_invalid;
}
-
- kfree(ino);
- ubifs_set_inode_flags(inode);
- 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_MAX_INO_NODE_SZ);
- 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 = alloc_inode_sb(sb, 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);
- init_rwsem(&ui->xattr_sem);
- spin_lock_init(&ui->ui_lock);
- return &ui->vfs_inode;
-};
-
-static void ubifs_free_inode(struct inode *inode)
-{
- struct ubifs_inode *ui = ubifs_inode(inode);
-
- kfree(ui->data);
- fscrypt_free_inode(inode);
-
- kmem_cache_free(ubifs_inode_slab, ui);
+ return 0;
}
-/*
- * Note, Linux write-back code calls this without 'i_mutex'.
+/**
+ * close_target - close the output target.
+ * @c: the UBIFS file-system description object
+ *
+ * Close the output target. If the target was an UBI
+ * volume, also close libubi.
+ *
+ * Returns %0 in case of success and a negative error code in case of failure.
*/
-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(c, !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 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));
-
- 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)
+int close_target(struct ubifs_info *c)
{
- 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);
+ if (c->dev_fd >= 0) {
+ if (c->libubi && ubi_set_property(c->dev_fd, UBI_VOL_PROP_DIRECT_WRITE, 0)) {
+ ubifs_err(c, "ubi_set_property(clear direct_write) failed. %s",
+ strerror(errno));
+ return -errno;
+ }
+ if (close(c->dev_fd) == -1) {
+ ubifs_err(c, "cannot close the target. %s",
+ strerror(errno));
+ return -errno;
+ }
}
-}
-
-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)
+/**
+ * check_volume_empty - check if the UBI volume is empty.
+ * @c: the UBIFS file-system description object
+ *
+ * This function checks if the UBI volume is empty by looking if its LEBs are
+ * mapped or not.
+ *
+ * Returns %0 in case of success, %1 is the volume is not empty,
+ * and a negative error code in case of failure.
+ */
+int check_volume_empty(struct ubifs_info *c)
{
- 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);
+ int lnum, err;
+ for (lnum = 0; lnum < c->vi.rsvd_lebs; lnum++) {
+ err = ubi_is_mapped(c->dev_fd, lnum);
+ if (err < 0)
+ return err;
+ if (err == 1)
+ return 1;
+ }
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;
+void init_ubifs_info(struct ubifs_info *c, int program_type)
+{
+ 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);
+ c->buds = RB_ROOT;
+ c->old_idx = RB_ROOT;
+ c->size_tree = RB_ROOT;
+ c->orph_tree = RB_ROOT;
+ 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;
+
+ c->program_type = program_type;
+ switch (c->program_type) {
+ case MKFS_PROGRAM_TYPE:
+ c->program_name = MKFS_PROGRAM_NAME;
+ break;
+ default:
+ assert(0);
+ break;
}
-
- /*
- * 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);
+ c->dev_fd = -1;
+ c->debug_level = default_debug_level;
}
/**
@@ -506,46 +209,49 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
* 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)
+int init_constants_early(struct ubifs_info *c)
{
+#define NOR_MAX_WRITESZ 64
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) {
+ if (c->vi.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->max_inode_sz = key_max_inode_size(c);
+ c->leb_cnt = c->vi.rsvd_lebs;
+ c->leb_size = c->vi.leb_size;
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;
+ if (c->min_io_size == 1)
+ /*
+ * Different from linux kernel, the max write size of nor flash
+ * is not exposed in sysfs, just reset @c->max_write_size.
+ */
+ c->max_write_size = NOR_MAX_WRITESZ;
+ else
+ c->max_write_size = c->di.min_io_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);
+ 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_errc(c, "too few LEBs (%d), min. is %d",
- 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_errc(c, "bad min. I/O size %d", c->min_io_size);
+ ubifs_err(c, "bad min. I/O size %d", c->min_io_size);
return -EINVAL;
}
@@ -556,8 +262,8 @@ static int init_constants_early(struct ubifs_info *c)
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);
+ ubifs_err(c, "bad write buffer size %d for %d min. I/O unit",
+ c->max_write_size, c->min_io_size);
return -EINVAL;
}
@@ -630,11 +336,6 @@ static int init_constants_early(struct ubifs_info *c)
*/
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;
@@ -670,7 +371,7 @@ static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad)
* 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 init_constants_sb(struct ubifs_info *c)
{
int tmp, err;
long long tmp64;
@@ -760,26 +461,9 @@ static int init_constants_sb(struct ubifs_info *c)
* 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)
+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;
}
/**
@@ -793,7 +477,7 @@ static void init_constants_master(struct ubifs_info *c)
* 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 take_gc_lnum(struct ubifs_info *c)
{
int err;
@@ -815,7 +499,7 @@ static int take_gc_lnum(struct ubifs_info *c)
* 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 alloc_wbufs(struct ubifs_info *c)
{
int i, err;
@@ -845,7 +529,6 @@ static int alloc_wbufs(struct ubifs_info *c)
* 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;
@@ -870,7 +553,7 @@ out_wbuf:
* free_wbufs - free write-buffers.
* @c: UBIFS file-system description object
*/
-static void free_wbufs(struct ubifs_info *c)
+void free_wbufs(struct ubifs_info *c)
{
int i;
@@ -889,7 +572,7 @@ static void free_wbufs(struct ubifs_info *c)
* free_orphans - free orphans.
* @c: UBIFS file-system description object
*/
-static void free_orphans(struct ubifs_info *c)
+void free_orphans(struct ubifs_info *c)
{
struct ubifs_orphan *orph;
@@ -926,257 +609,13 @@ static void free_buds(struct ubifs_info *c)
}
/**
- * 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)
+void destroy_journal(struct ubifs_info *c)
{
while (!list_empty(&c->unclean_leb_list)) {
struct ubifs_unclean_leb *ucleb;
@@ -1199,1307 +638,3 @@ static void destroy_journal(struct ubifs_info *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 = ubifs_sysfs_register(c);
- if (err)
- goto out_debugging;
-
- 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_run(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;
- }
- }
-
- 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), max %d LEBs, journal size %lld bytes (%lld MiB, %d LEBs)",
- x, x >> 20, c->main_lebs, c->max_leb_cnt,
- 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: %llu (%llu KiB, %llu 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_sysfs_unregister(c);
-out_debugging:
- 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_sysfs_unregister(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_run(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;
- }
-
- 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;
- }
- 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 without 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 read_folio,
- * 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;
- sb->s_xattr = ubifs_xattr_handlers;
- 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;
- }
-
- import_uuid(&sb->s_uuid, c->uuid);
-
- 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 = -ENOMEM;
-
- 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;
-
- ubifs_shrinker_info = shrinker_alloc(0, "ubifs-slab");
- if (!ubifs_shrinker_info)
- goto out_slab;
-
- ubifs_shrinker_info->count_objects = ubifs_shrink_count;
- ubifs_shrinker_info->scan_objects = ubifs_shrink_scan;
-
- shrinker_register(ubifs_shrinker_info);
-
- err = ubifs_compressors_init();
- if (err)
- goto out_shrinker;
-
- dbg_debugfs_init();
-
- err = ubifs_sysfs_init();
- if (err)
- goto out_dbg;
-
- 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_sysfs;
- }
- return 0;
-
-out_sysfs:
- ubifs_sysfs_exit();
-out_dbg:
- dbg_debugfs_exit();
- ubifs_compressors_exit();
-out_shrinker:
- shrinker_free(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_sysfs_exit();
- ubifs_compressors_exit();
- shrinker_free(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");
--
2.13.6
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