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/cramfs/inode.c | 86 +++++++++++++++++++++++++------------------
1 files changed, 50 insertions(+), 36 deletions(-)
diff --git a/kernel/fs/cramfs/inode.c b/kernel/fs/cramfs/inode.c
index 6e00039..6245470 100644
--- a/kernel/fs/cramfs/inode.c
+++ b/kernel/fs/cramfs/inode.c
@@ -24,6 +24,7 @@
#include <linux/blkdev.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/super.h>
+#include <linux/fs_context.h>
#include <linux/slab.h>
#include <linux/vfs.h>
#include <linux/mutex.h>
@@ -419,9 +420,12 @@
int i;
vma->vm_flags |= VM_MIXEDMAP;
for (i = 0; i < pages && !ret; i++) {
+ vm_fault_t vmf;
unsigned long off = i * PAGE_SIZE;
pfn_t pfn = phys_to_pfn_t(address + off, PFN_DEV);
- ret = vm_insert_mixed(vma, vma->vm_start + off, pfn);
+ vmf = vmf_insert_mixed(vma, vma->vm_start + off, pfn);
+ if (vmf & VM_FAULT_ERROR)
+ ret = vm_fault_to_errno(vmf, 0);
}
}
@@ -503,18 +507,19 @@
kfree(sbi);
}
-static int cramfs_remount(struct super_block *sb, int *flags, char *data)
+static int cramfs_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 int cramfs_read_super(struct super_block *sb,
- struct cramfs_super *super, int silent)
+static int cramfs_read_super(struct super_block *sb, struct fs_context *fc,
+ struct cramfs_super *super)
{
struct cramfs_sb_info *sbi = CRAMFS_SB(sb);
unsigned long root_offset;
+ bool silent = fc->sb_flags & SB_SILENT;
/* We don't know the real size yet */
sbi->size = PAGE_SIZE;
@@ -529,7 +534,7 @@
/* check for wrong endianness */
if (super->magic == CRAMFS_MAGIC_WEND) {
if (!silent)
- pr_err("wrong endianness\n");
+ errorfc(fc, "wrong endianness");
return -EINVAL;
}
@@ -541,22 +546,22 @@
mutex_unlock(&read_mutex);
if (super->magic != CRAMFS_MAGIC) {
if (super->magic == CRAMFS_MAGIC_WEND && !silent)
- pr_err("wrong endianness\n");
+ errorfc(fc, "wrong endianness");
else if (!silent)
- pr_err("wrong magic\n");
+ errorfc(fc, "wrong magic");
return -EINVAL;
}
}
/* get feature flags first */
if (super->flags & ~CRAMFS_SUPPORTED_FLAGS) {
- pr_err("unsupported filesystem features\n");
+ errorfc(fc, "unsupported filesystem features");
return -EINVAL;
}
/* Check that the root inode is in a sane state */
if (!S_ISDIR(super->root.mode)) {
- pr_err("root is not a directory\n");
+ errorfc(fc, "root is not a directory");
return -EINVAL;
}
/* correct strange, hard-coded permissions of mkcramfs */
@@ -575,12 +580,12 @@
sbi->magic = super->magic;
sbi->flags = super->flags;
if (root_offset == 0)
- pr_info("empty filesystem");
+ infofc(fc, "empty filesystem");
else if (!(super->flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
((root_offset != sizeof(struct cramfs_super)) &&
(root_offset != 512 + sizeof(struct cramfs_super))))
{
- pr_err("bad root offset %lu\n", root_offset);
+ errorfc(fc, "bad root offset %lu", root_offset);
return -EINVAL;
}
@@ -594,6 +599,8 @@
/* Set it all up.. */
sb->s_flags |= SB_RDONLY;
+ sb->s_time_min = 0;
+ sb->s_time_max = 0;
sb->s_op = &cramfs_ops;
root = get_cramfs_inode(sb, cramfs_root, 0);
if (IS_ERR(root))
@@ -604,8 +611,7 @@
return 0;
}
-static int cramfs_blkdev_fill_super(struct super_block *sb, void *data,
- int silent)
+static int cramfs_blkdev_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct cramfs_sb_info *sbi;
struct cramfs_super super;
@@ -620,14 +626,13 @@
for (i = 0; i < READ_BUFFERS; i++)
buffer_blocknr[i] = -1;
- err = cramfs_read_super(sb, &super, silent);
+ err = cramfs_read_super(sb, fc, &super);
if (err)
return err;
return cramfs_finalize_super(sb, &super.root);
}
-static int cramfs_mtd_fill_super(struct super_block *sb, void *data,
- int silent)
+static int cramfs_mtd_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct cramfs_sb_info *sbi;
struct cramfs_super super;
@@ -649,7 +654,7 @@
pr_info("checking physical address %pap for linear cramfs image\n",
&sbi->linear_phys_addr);
- err = cramfs_read_super(sb, &super, silent);
+ err = cramfs_read_super(sb, fc, &super);
if (err)
return err;
@@ -685,8 +690,7 @@
buf->f_bavail = 0;
buf->f_files = CRAMFS_SB(sb)->files;
buf->f_ffree = 0;
- buf->f_fsid.val[0] = (u32)id;
- buf->f_fsid.val[1] = (u32)(id >> 32);
+ buf->f_fsid = u64_to_fsid(id);
buf->f_namelen = CRAMFS_MAXPATHLEN;
return 0;
}
@@ -870,8 +874,8 @@
if (unlikely(block_start & CRAMFS_BLK_FLAG_DIRECT_PTR)) {
/* See comments on earlier code. */
u32 prev_start = block_start;
- block_start = prev_start & ~CRAMFS_BLK_FLAGS;
- block_start <<= CRAMFS_BLK_DIRECT_PTR_SHIFT;
+ block_start = prev_start & ~CRAMFS_BLK_FLAGS;
+ block_start <<= CRAMFS_BLK_DIRECT_PTR_SHIFT;
if (prev_start & CRAMFS_BLK_FLAG_UNCOMPRESSED) {
block_start += PAGE_SIZE;
} else {
@@ -944,32 +948,41 @@
};
static const struct super_operations cramfs_ops = {
- .remount_fs = cramfs_remount,
.statfs = cramfs_statfs,
};
-static struct dentry *cramfs_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data)
+static int cramfs_get_tree(struct fs_context *fc)
{
- struct dentry *ret = ERR_PTR(-ENOPROTOOPT);
+ int ret = -ENOPROTOOPT;
if (IS_ENABLED(CONFIG_CRAMFS_MTD)) {
- ret = mount_mtd(fs_type, flags, dev_name, data,
- cramfs_mtd_fill_super);
- if (!IS_ERR(ret))
- return ret;
+ ret = get_tree_mtd(fc, cramfs_mtd_fill_super);
+ if (!ret)
+ return 0;
}
- if (IS_ENABLED(CONFIG_CRAMFS_BLOCKDEV)) {
- ret = mount_bdev(fs_type, flags, dev_name, data,
- cramfs_blkdev_fill_super);
- }
+ if (IS_ENABLED(CONFIG_CRAMFS_BLOCKDEV))
+ ret = get_tree_bdev(fc, cramfs_blkdev_fill_super);
return ret;
+}
+
+static const struct fs_context_operations cramfs_context_ops = {
+ .get_tree = cramfs_get_tree,
+ .reconfigure = cramfs_reconfigure,
+};
+
+/*
+ * Set up the filesystem mount context.
+ */
+static int cramfs_init_fs_context(struct fs_context *fc)
+{
+ fc->ops = &cramfs_context_ops;
+ return 0;
}
static struct file_system_type cramfs_fs_type = {
.owner = THIS_MODULE,
.name = "cramfs",
- .mount = cramfs_mount,
+ .init_fs_context = cramfs_init_fs_context,
.kill_sb = cramfs_kill_sb,
.fs_flags = FS_REQUIRES_DEV,
};
@@ -997,3 +1010,4 @@
module_init(init_cramfs_fs)
module_exit(exit_cramfs_fs)
MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
--
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