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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /fs/jffs2/super.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/jffs2/super.c')
-rw-r--r--fs/jffs2/super.c441
1 files changed, 441 insertions, 0 deletions
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
new file mode 100644
index 0000000000..7ea37f49f1
--- /dev/null
+++ b/fs/jffs2/super.c
@@ -0,0 +1,441 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright © 2001-2007 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@infradead.org>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/fs.h>
+#include <linux/err.h>
+#include <linux/mount.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
+#include <linux/jffs2.h>
+#include <linux/pagemap.h>
+#include <linux/mtd/super.h>
+#include <linux/ctype.h>
+#include <linux/namei.h>
+#include <linux/seq_file.h>
+#include <linux/exportfs.h>
+#include "compr.h"
+#include "nodelist.h"
+
+static void jffs2_put_super(struct super_block *);
+
+static struct kmem_cache *jffs2_inode_cachep;
+
+static struct inode *jffs2_alloc_inode(struct super_block *sb)
+{
+ struct jffs2_inode_info *f;
+
+ f = alloc_inode_sb(sb, jffs2_inode_cachep, GFP_KERNEL);
+ if (!f)
+ return NULL;
+ return &f->vfs_inode;
+}
+
+static void jffs2_free_inode(struct inode *inode)
+{
+ struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
+
+ kfree(f->target);
+ kmem_cache_free(jffs2_inode_cachep, f);
+}
+
+static void jffs2_i_init_once(void *foo)
+{
+ struct jffs2_inode_info *f = foo;
+
+ mutex_init(&f->sem);
+ inode_init_once(&f->vfs_inode);
+}
+
+static const char *jffs2_compr_name(unsigned int compr)
+{
+ switch (compr) {
+ case JFFS2_COMPR_MODE_NONE:
+ return "none";
+#ifdef CONFIG_JFFS2_LZO
+ case JFFS2_COMPR_MODE_FORCELZO:
+ return "lzo";
+#endif
+#ifdef CONFIG_JFFS2_ZLIB
+ case JFFS2_COMPR_MODE_FORCEZLIB:
+ return "zlib";
+#endif
+ default:
+ /* should never happen; programmer error */
+ WARN_ON(1);
+ return "";
+ }
+}
+
+static int jffs2_show_options(struct seq_file *s, struct dentry *root)
+{
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb);
+ struct jffs2_mount_opts *opts = &c->mount_opts;
+
+ if (opts->override_compr)
+ seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));
+ if (opts->set_rp_size)
+ seq_printf(s, ",rp_size=%u", opts->rp_size / 1024);
+
+ return 0;
+}
+
+static int jffs2_sync_fs(struct super_block *sb, int wait)
+{
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
+ if (jffs2_is_writebuffered(c))
+ cancel_delayed_work_sync(&c->wbuf_dwork);
+#endif
+
+ mutex_lock(&c->alloc_sem);
+ jffs2_flush_wbuf_pad(c);
+ mutex_unlock(&c->alloc_sem);
+ return 0;
+}
+
+static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
+ uint32_t generation)
+{
+ /* We don't care about i_generation. We'll destroy the flash
+ before we start re-using inode numbers anyway. And even
+ if that wasn't true, we'd have other problems...*/
+ return jffs2_iget(sb, ino);
+}
+
+static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type)
+{
+ return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+ jffs2_nfs_get_inode);
+}
+
+static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type)
+{
+ return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+ jffs2_nfs_get_inode);
+}
+
+static struct dentry *jffs2_get_parent(struct dentry *child)
+{
+ struct jffs2_inode_info *f;
+ uint32_t pino;
+
+ BUG_ON(!d_is_dir(child));
+
+ f = JFFS2_INODE_INFO(d_inode(child));
+
+ pino = f->inocache->pino_nlink;
+
+ JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
+ f->inocache->ino, pino);
+
+ return d_obtain_alias(jffs2_iget(child->d_sb, pino));
+}
+
+static const struct export_operations jffs2_export_ops = {
+ .get_parent = jffs2_get_parent,
+ .fh_to_dentry = jffs2_fh_to_dentry,
+ .fh_to_parent = jffs2_fh_to_parent,
+};
+
+/*
+ * JFFS2 mount options.
+ *
+ * Opt_source: The source device
+ * Opt_override_compr: override default compressor
+ * Opt_rp_size: size of reserved pool in KiB
+ */
+enum {
+ Opt_override_compr,
+ Opt_rp_size,
+};
+
+static const struct constant_table jffs2_param_compr[] = {
+ {"none", JFFS2_COMPR_MODE_NONE },
+#ifdef CONFIG_JFFS2_LZO
+ {"lzo", JFFS2_COMPR_MODE_FORCELZO },
+#endif
+#ifdef CONFIG_JFFS2_ZLIB
+ {"zlib", JFFS2_COMPR_MODE_FORCEZLIB },
+#endif
+ {}
+};
+
+static const struct fs_parameter_spec jffs2_fs_parameters[] = {
+ fsparam_enum ("compr", Opt_override_compr, jffs2_param_compr),
+ fsparam_u32 ("rp_size", Opt_rp_size),
+ {}
+};
+
+static int jffs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+ struct fs_parse_result result;
+ struct jffs2_sb_info *c = fc->s_fs_info;
+ int opt;
+
+ opt = fs_parse(fc, jffs2_fs_parameters, param, &result);
+ if (opt < 0)
+ return opt;
+
+ switch (opt) {
+ case Opt_override_compr:
+ c->mount_opts.compr = result.uint_32;
+ c->mount_opts.override_compr = true;
+ break;
+ case Opt_rp_size:
+ if (result.uint_32 > UINT_MAX / 1024)
+ return invalf(fc, "jffs2: rp_size unrepresentable");
+ c->mount_opts.rp_size = result.uint_32 * 1024;
+ c->mount_opts.set_rp_size = true;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static inline void jffs2_update_mount_opts(struct fs_context *fc)
+{
+ struct jffs2_sb_info *new_c = fc->s_fs_info;
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(fc->root->d_sb);
+
+ mutex_lock(&c->alloc_sem);
+ if (new_c->mount_opts.override_compr) {
+ c->mount_opts.override_compr = new_c->mount_opts.override_compr;
+ c->mount_opts.compr = new_c->mount_opts.compr;
+ }
+ if (new_c->mount_opts.set_rp_size) {
+ c->mount_opts.set_rp_size = new_c->mount_opts.set_rp_size;
+ c->mount_opts.rp_size = new_c->mount_opts.rp_size;
+ }
+ mutex_unlock(&c->alloc_sem);
+}
+
+static int jffs2_reconfigure(struct fs_context *fc)
+{
+ struct super_block *sb = fc->root->d_sb;
+
+ sync_filesystem(sb);
+ jffs2_update_mount_opts(fc);
+
+ return jffs2_do_remount_fs(sb, fc);
+}
+
+static const struct super_operations jffs2_super_operations =
+{
+ .alloc_inode = jffs2_alloc_inode,
+ .free_inode = jffs2_free_inode,
+ .put_super = jffs2_put_super,
+ .statfs = jffs2_statfs,
+ .evict_inode = jffs2_evict_inode,
+ .dirty_inode = jffs2_dirty_inode,
+ .show_options = jffs2_show_options,
+ .sync_fs = jffs2_sync_fs,
+};
+
+/*
+ * fill in the superblock
+ */
+static int jffs2_fill_super(struct super_block *sb, struct fs_context *fc)
+{
+ struct jffs2_sb_info *c = sb->s_fs_info;
+
+ jffs2_dbg(1, "jffs2_get_sb_mtd():"
+ " New superblock for device %d (\"%s\")\n",
+ sb->s_mtd->index, sb->s_mtd->name);
+
+ c->mtd = sb->s_mtd;
+ c->os_priv = sb;
+
+ if (c->mount_opts.rp_size > c->mtd->size)
+ return invalf(fc, "jffs2: Too large reserve pool specified, max is %llu KB",
+ c->mtd->size / 1024);
+
+ /* Initialize JFFS2 superblock locks, the further initialization will
+ * be done later */
+ mutex_init(&c->alloc_sem);
+ mutex_init(&c->erase_free_sem);
+ init_waitqueue_head(&c->erase_wait);
+ init_waitqueue_head(&c->inocache_wq);
+ spin_lock_init(&c->erase_completion_lock);
+ spin_lock_init(&c->inocache_lock);
+
+ sb->s_op = &jffs2_super_operations;
+ sb->s_export_op = &jffs2_export_ops;
+ sb->s_flags = sb->s_flags | SB_NOATIME;
+ sb->s_xattr = jffs2_xattr_handlers;
+#ifdef CONFIG_JFFS2_FS_POSIX_ACL
+ sb->s_flags |= SB_POSIXACL;
+#endif
+ return jffs2_do_fill_super(sb, fc);
+}
+
+static int jffs2_get_tree(struct fs_context *fc)
+{
+ return get_tree_mtd(fc, jffs2_fill_super);
+}
+
+static void jffs2_free_fc(struct fs_context *fc)
+{
+ kfree(fc->s_fs_info);
+}
+
+static const struct fs_context_operations jffs2_context_ops = {
+ .free = jffs2_free_fc,
+ .parse_param = jffs2_parse_param,
+ .get_tree = jffs2_get_tree,
+ .reconfigure = jffs2_reconfigure,
+};
+
+static int jffs2_init_fs_context(struct fs_context *fc)
+{
+ struct jffs2_sb_info *ctx;
+
+ ctx = kzalloc(sizeof(struct jffs2_sb_info), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ fc->s_fs_info = ctx;
+ fc->ops = &jffs2_context_ops;
+ return 0;
+}
+
+static void jffs2_put_super (struct super_block *sb)
+{
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+
+ jffs2_dbg(2, "%s()\n", __func__);
+
+ mutex_lock(&c->alloc_sem);
+ jffs2_flush_wbuf_pad(c);
+ mutex_unlock(&c->alloc_sem);
+
+ jffs2_sum_exit(c);
+
+ jffs2_free_ino_caches(c);
+ jffs2_free_raw_node_refs(c);
+ kvfree(c->blocks);
+ jffs2_flash_cleanup(c);
+ kfree(c->inocache_list);
+ jffs2_clear_xattr_subsystem(c);
+ mtd_sync(c->mtd);
+ jffs2_dbg(1, "%s(): returning\n", __func__);
+}
+
+static void jffs2_kill_sb(struct super_block *sb)
+{
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+ if (c && !sb_rdonly(sb))
+ jffs2_stop_garbage_collect_thread(c);
+ kill_mtd_super(sb);
+ kfree(c);
+}
+
+static struct file_system_type jffs2_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "jffs2",
+ .init_fs_context = jffs2_init_fs_context,
+ .parameters = jffs2_fs_parameters,
+ .kill_sb = jffs2_kill_sb,
+};
+MODULE_ALIAS_FS("jffs2");
+
+static int __init init_jffs2_fs(void)
+{
+ int ret;
+
+ /* Paranoia checks for on-medium structures. If we ask GCC
+ to pack them with __attribute__((packed)) then it _also_
+ assumes that they're not aligned -- so it emits crappy
+ code on some architectures. Ideally we want an attribute
+ which means just 'no padding', without the alignment
+ thing. But GCC doesn't have that -- we have to just
+ hope the structs are the right sizes, instead. */
+ BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
+ BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
+ BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
+ BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
+
+ pr_info("version 2.2."
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
+ " (NAND)"
+#endif
+#ifdef CONFIG_JFFS2_SUMMARY
+ " (SUMMARY) "
+#endif
+ " © 2001-2006 Red Hat, Inc.\n");
+
+ jffs2_inode_cachep = kmem_cache_create("jffs2_i",
+ sizeof(struct jffs2_inode_info),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD|SLAB_ACCOUNT),
+ jffs2_i_init_once);
+ if (!jffs2_inode_cachep) {
+ pr_err("error: Failed to initialise inode cache\n");
+ return -ENOMEM;
+ }
+ ret = jffs2_compressors_init();
+ if (ret) {
+ pr_err("error: Failed to initialise compressors\n");
+ goto out;
+ }
+ ret = jffs2_create_slab_caches();
+ if (ret) {
+ pr_err("error: Failed to initialise slab caches\n");
+ goto out_compressors;
+ }
+ ret = register_filesystem(&jffs2_fs_type);
+ if (ret) {
+ pr_err("error: Failed to register filesystem\n");
+ goto out_slab;
+ }
+ return 0;
+
+ out_slab:
+ jffs2_destroy_slab_caches();
+ out_compressors:
+ jffs2_compressors_exit();
+ out:
+ kmem_cache_destroy(jffs2_inode_cachep);
+ return ret;
+}
+
+static void __exit exit_jffs2_fs(void)
+{
+ unregister_filesystem(&jffs2_fs_type);
+ jffs2_destroy_slab_caches();
+ jffs2_compressors_exit();
+
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(jffs2_inode_cachep);
+}
+
+module_init(init_jffs2_fs);
+module_exit(exit_jffs2_fs);
+
+MODULE_DESCRIPTION("The Journalling Flash File System, v2");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
+ // the sake of this tag. It's Free Software.