From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/fs/romfs/super.c | 64 +++++++++++++++++--------------
1 files changed, 35 insertions(+), 29 deletions(-)
diff --git a/kernel/fs/romfs/super.c b/kernel/fs/romfs/super.c
index 6ccb519..c335658 100644
--- a/kernel/fs/romfs/super.c
+++ b/kernel/fs/romfs/super.c
@@ -65,7 +65,7 @@
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
-#include <linux/parser.h>
+#include <linux/fs_context.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/statfs.h>
@@ -356,6 +356,7 @@
}
i->i_mode = mode;
+ i->i_blocks = (i->i_size + 511) >> 9;
unlock_new_inode(i);
return i;
@@ -381,16 +382,9 @@
/*
* return a spent inode to the slab cache
*/
-static void romfs_i_callback(struct rcu_head *head)
+static void romfs_free_inode(struct inode *inode)
{
- struct inode *inode = container_of(head, struct inode, i_rcu);
-
kmem_cache_free(romfs_inode_cachep, ROMFS_I(inode));
-}
-
-static void romfs_destroy_inode(struct inode *inode)
-{
- call_rcu(&inode->i_rcu, romfs_i_callback);
}
/*
@@ -422,26 +416,24 @@
buf->f_bfree = buf->f_bavail = buf->f_ffree;
buf->f_blocks =
(romfs_maxsize(dentry->d_sb) + ROMBSIZE - 1) >> ROMBSBITS;
- buf->f_fsid.val[0] = (u32)id;
- buf->f_fsid.val[1] = (u32)(id >> 32);
+ buf->f_fsid = u64_to_fsid(id);
return 0;
}
/*
* remounting must involve read-only
*/
-static int romfs_remount(struct super_block *sb, int *flags, char *data)
+static int romfs_reconfigure(struct fs_context *fc)
{
- sync_filesystem(sb);
- *flags |= SB_RDONLY;
+ sync_filesystem(fc->root->d_sb);
+ fc->sb_flags |= SB_RDONLY;
return 0;
}
static const struct super_operations romfs_super_ops = {
.alloc_inode = romfs_alloc_inode,
- .destroy_inode = romfs_destroy_inode,
+ .free_inode = romfs_free_inode,
.statfs = romfs_statfs,
- .remount_fs = romfs_remount,
};
/*
@@ -464,7 +456,7 @@
/*
* fill in the superblock
*/
-static int romfs_fill_super(struct super_block *sb, void *data, int silent)
+static int romfs_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct romfs_super_block *rsb;
struct inode *root;
@@ -485,6 +477,8 @@
sb->s_maxbytes = 0xFFFFFFFF;
sb->s_magic = ROMFS_MAGIC;
sb->s_flags |= SB_RDONLY | SB_NOATIME;
+ sb->s_time_min = 0;
+ sb->s_time_max = 0;
sb->s_op = &romfs_super_ops;
#ifdef CONFIG_ROMFS_ON_MTD
@@ -511,8 +505,8 @@
if (rsb->word0 != ROMSB_WORD0 || rsb->word1 != ROMSB_WORD1 ||
img_size < ROMFH_SIZE) {
- if (!silent)
- pr_warn("VFS: Can't find a romfs filesystem on dev %s.\n",
+ if (!(fc->sb_flags & SB_SILENT))
+ errorf(fc, "VFS: Can't find a romfs filesystem on dev %s.\n",
sb->s_id);
goto error_rsb_inval;
}
@@ -525,7 +519,7 @@
storage = sb->s_mtd ? "MTD" : "the block layer";
len = strnlen(rsb->name, ROMFS_MAXFN);
- if (!silent)
+ if (!(fc->sb_flags & SB_SILENT))
pr_notice("Mounting image '%*.*s' through %s\n",
(unsigned) len, (unsigned) len, rsb->name, storage);
@@ -555,21 +549,32 @@
/*
* get a superblock for mounting
*/
-static struct dentry *romfs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name,
- void *data)
+static int romfs_get_tree(struct fs_context *fc)
{
- struct dentry *ret = ERR_PTR(-EINVAL);
+ int ret = -EINVAL;
#ifdef CONFIG_ROMFS_ON_MTD
- ret = mount_mtd(fs_type, flags, dev_name, data, romfs_fill_super);
+ ret = get_tree_mtd(fc, romfs_fill_super);
#endif
#ifdef CONFIG_ROMFS_ON_BLOCK
- if (ret == ERR_PTR(-EINVAL))
- ret = mount_bdev(fs_type, flags, dev_name, data,
- romfs_fill_super);
+ if (ret == -EINVAL)
+ ret = get_tree_bdev(fc, romfs_fill_super);
#endif
return ret;
+}
+
+static const struct fs_context_operations romfs_context_ops = {
+ .get_tree = romfs_get_tree,
+ .reconfigure = romfs_reconfigure,
+};
+
+/*
+ * Set up the filesystem mount context.
+ */
+static int romfs_init_fs_context(struct fs_context *fc)
+{
+ fc->ops = &romfs_context_ops;
+ return 0;
}
/*
@@ -594,7 +599,7 @@
static struct file_system_type romfs_fs_type = {
.owner = THIS_MODULE,
.name = "romfs",
- .mount = romfs_mount,
+ .init_fs_context = romfs_init_fs_context,
.kill_sb = romfs_kill_sb,
.fs_flags = FS_REQUIRES_DEV,
};
@@ -661,3 +666,4 @@
MODULE_DESCRIPTION("Direct-MTD Capable RomFS");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL"); /* Actually dual-licensed, but it doesn't matter for */
+MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
--
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