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path: root/fs/jffs2/super.c
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Diffstat (limited to 'fs/jffs2/super.c')
-rw-r--r--fs/jffs2/super.c209
1 files changed, 168 insertions, 41 deletions
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index 9a80e8e595d..0918f0e2e26 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -9,20 +9,23 @@
*
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
-#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/fs.h>
#include <linux/err.h>
#include <linux/mount.h>
+#include <linux/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"
@@ -41,11 +44,17 @@ static struct inode *jffs2_alloc_inode(struct super_block *sb)
return &f->vfs_inode;
}
-static void jffs2_destroy_inode(struct inode *inode)
+static void jffs2_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
}
+static void jffs2_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, jffs2_i_callback);
+}
+
static void jffs2_i_init_once(void *foo)
{
struct jffs2_inode_info *f = foo;
@@ -54,28 +63,46 @@ static void jffs2_i_init_once(void *foo)
inode_init_once(&f->vfs_inode);
}
-static void jffs2_write_super(struct super_block *sb)
+static const char *jffs2_compr_name(unsigned int compr)
{
- struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+ 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 "";
+ }
+}
- lock_super(sb);
- sb->s_dirt = 0;
+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 (!(sb->s_flags & MS_RDONLY)) {
- D1(printk(KERN_DEBUG "jffs2_write_super()\n"));
- jffs2_garbage_collect_trigger(c);
- jffs2_erase_pending_blocks(c, 0);
- jffs2_flush_wbuf_gc(c, 0);
- }
+ if (opts->override_compr)
+ seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));
+ if (opts->rp_size)
+ seq_printf(s, ",rp_size=%u", opts->rp_size / 1024);
- unlock_super(sb);
+ return 0;
}
static int jffs2_sync_fs(struct super_block *sb, int wait)
{
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
- jffs2_write_super(sb);
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
+ cancel_delayed_work_sync(&c->wbuf_dwork);
+#endif
mutex_lock(&c->alloc_sem);
jffs2_flush_wbuf_pad(c);
@@ -129,16 +156,111 @@ static const struct export_operations jffs2_export_ops = {
.fh_to_parent = jffs2_fh_to_parent,
};
+/*
+ * JFFS2 mount options.
+ *
+ * Opt_override_compr: override default compressor
+ * Opt_rp_size: size of reserved pool in KiB
+ * Opt_err: just end of array marker
+ */
+enum {
+ Opt_override_compr,
+ Opt_rp_size,
+ Opt_err,
+};
+
+static const match_table_t tokens = {
+ {Opt_override_compr, "compr=%s"},
+ {Opt_rp_size, "rp_size=%u"},
+ {Opt_err, NULL},
+};
+
+static int jffs2_parse_options(struct jffs2_sb_info *c, char *data)
+{
+ substring_t args[MAX_OPT_ARGS];
+ char *p, *name;
+ unsigned int opt;
+
+ if (!data)
+ return 0;
+
+ while ((p = strsep(&data, ","))) {
+ int token;
+
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_override_compr:
+ name = match_strdup(&args[0]);
+
+ if (!name)
+ return -ENOMEM;
+ if (!strcmp(name, "none"))
+ c->mount_opts.compr = JFFS2_COMPR_MODE_NONE;
+#ifdef CONFIG_JFFS2_LZO
+ else if (!strcmp(name, "lzo"))
+ c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO;
+#endif
+#ifdef CONFIG_JFFS2_ZLIB
+ else if (!strcmp(name, "zlib"))
+ c->mount_opts.compr =
+ JFFS2_COMPR_MODE_FORCEZLIB;
+#endif
+ else {
+ pr_err("Error: unknown compressor \"%s\"\n",
+ name);
+ kfree(name);
+ return -EINVAL;
+ }
+ kfree(name);
+ c->mount_opts.override_compr = true;
+ break;
+ case Opt_rp_size:
+ if (match_int(&args[0], &opt))
+ return -EINVAL;
+ opt *= 1024;
+ if (opt > c->mtd->size) {
+ pr_warn("Too large reserve pool specified, max "
+ "is %llu KB\n", c->mtd->size / 1024);
+ return -EINVAL;
+ }
+ c->mount_opts.rp_size = opt;
+ break;
+ default:
+ pr_err("Error: unrecognized mount option '%s' or missing value\n",
+ p);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int jffs2_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+ int err;
+
+ sync_filesystem(sb);
+ err = jffs2_parse_options(c, data);
+ if (err)
+ return -EINVAL;
+
+ return jffs2_do_remount_fs(sb, flags, data);
+}
+
static const struct super_operations jffs2_super_operations =
{
.alloc_inode = jffs2_alloc_inode,
.destroy_inode =jffs2_destroy_inode,
.put_super = jffs2_put_super,
- .write_super = jffs2_write_super,
.statfs = jffs2_statfs,
.remount_fs = jffs2_remount_fs,
- .clear_inode = jffs2_clear_inode,
+ .evict_inode = jffs2_evict_inode,
.dirty_inode = jffs2_dirty_inode,
+ .show_options = jffs2_show_options,
.sync_fs = jffs2_sync_fs,
};
@@ -148,10 +270,11 @@ static const struct super_operations jffs2_super_operations =
static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
{
struct jffs2_sb_info *c;
+ int ret;
- D1(printk(KERN_DEBUG "jffs2_get_sb_mtd():"
+ jffs2_dbg(1, "jffs2_get_sb_mtd():"
" New superblock for device %d (\"%s\")\n",
- sb->s_mtd->index, sb->s_mtd->name));
+ sb->s_mtd->index, sb->s_mtd->name);
c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c)
@@ -161,6 +284,12 @@ static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
c->os_priv = sb;
sb->s_fs_info = c;
+ ret = jffs2_parse_options(c, data);
+ if (ret) {
+ kfree(c);
+ return -EINVAL;
+ }
+
/* Initialize JFFS2 superblock locks, the further initialization will
* be done later */
mutex_init(&c->alloc_sem);
@@ -177,27 +306,22 @@ static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
sb->s_flags |= MS_POSIXACL;
#endif
- return jffs2_do_fill_super(sb, data, silent);
+ ret = jffs2_do_fill_super(sb, data, silent);
+ return ret;
}
-static int jffs2_get_sb(struct file_system_type *fs_type,
+static struct dentry *jffs2_mount(struct file_system_type *fs_type,
int flags, const char *dev_name,
- void *data, struct vfsmount *mnt)
+ void *data)
{
- return get_sb_mtd(fs_type, flags, dev_name, data, jffs2_fill_super,
- mnt);
+ return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super);
}
static void jffs2_put_super (struct super_block *sb)
{
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
- D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
-
- lock_kernel();
-
- if (sb->s_dirt)
- jffs2_write_super(sb);
+ jffs2_dbg(2, "%s()\n", __func__);
mutex_lock(&c->alloc_sem);
jffs2_flush_wbuf_pad(c);
@@ -214,12 +338,8 @@ static void jffs2_put_super (struct super_block *sb)
jffs2_flash_cleanup(c);
kfree(c->inocache_list);
jffs2_clear_xattr_subsystem(c);
- if (c->mtd->sync)
- c->mtd->sync(c->mtd);
-
- unlock_kernel();
-
- D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
+ mtd_sync(c->mtd);
+ jffs2_dbg(1, "%s(): returning\n", __func__);
}
static void jffs2_kill_sb(struct super_block *sb)
@@ -234,9 +354,10 @@ static void jffs2_kill_sb(struct super_block *sb)
static struct file_system_type jffs2_fs_type = {
.owner = THIS_MODULE,
.name = "jffs2",
- .get_sb = jffs2_get_sb,
+ .mount = jffs2_mount,
.kill_sb = jffs2_kill_sb,
};
+MODULE_ALIAS_FS("jffs2");
static int __init init_jffs2_fs(void)
{
@@ -254,7 +375,7 @@ static int __init init_jffs2_fs(void)
BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
- printk(KERN_INFO "JFFS2 version 2.2."
+ pr_info("version 2.2."
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
" (NAND)"
#endif
@@ -269,22 +390,22 @@ static int __init init_jffs2_fs(void)
SLAB_MEM_SPREAD),
jffs2_i_init_once);
if (!jffs2_inode_cachep) {
- printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n");
+ pr_err("error: Failed to initialise inode cache\n");
return -ENOMEM;
}
ret = jffs2_compressors_init();
if (ret) {
- printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n");
+ pr_err("error: Failed to initialise compressors\n");
goto out;
}
ret = jffs2_create_slab_caches();
if (ret) {
- printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n");
+ pr_err("error: Failed to initialise slab caches\n");
goto out_compressors;
}
ret = register_filesystem(&jffs2_fs_type);
if (ret) {
- printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n");
+ pr_err("error: Failed to register filesystem\n");
goto out_slab;
}
return 0;
@@ -303,6 +424,12 @@ 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);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 22:02:23 +0000