#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
+#include <linux/time.h>
#include <linux/init.h>
#include <linux/string.h>
-#include <linux/smp_lock.h>
#include <linux/backing-dev.h>
#include <linux/ramfs.h>
-
+#include <linux/sched.h>
+#include <linux/parser.h>
#include <asm/uaccess.h>
+#include "internal.h"
/* some random number */
#define RAMFS_MAGIC 0x858458f6
-static struct super_operations ramfs_ops;
-static struct address_space_operations ramfs_aops;
-static struct inode_operations ramfs_file_inode_operations;
-static struct inode_operations ramfs_dir_inode_operations;
+#define RAMFS_DEFAULT_MODE 0755
+
+static const struct super_operations ramfs_ops;
+static const struct inode_operations ramfs_dir_inode_operations;
static struct backing_dev_info ramfs_backing_dev_info = {
.ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK |
+ .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK |
BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY |
BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP,
};
if (inode) {
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
- inode->i_blksize = PAGE_CACHE_SIZE;
- inode->i_blocks = 0;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_mapping->a_ops = &ramfs_aops;
inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info;
+ mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER);
+ mapping_set_unevictable(inode->i_mapping);
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
switch (mode & S_IFMT) {
default:
inode->i_fop = &simple_dir_operations;
/* directory inodes start off with i_nlink == 2 (for "." entry) */
- inode->i_nlink++;
+ inc_nlink(inode);
break;
case S_IFLNK:
inode->i_op = &page_symlink_inode_operations;
d_instantiate(dentry, inode);
dget(dentry); /* Extra count - pin the dentry in core */
error = 0;
+ dir->i_mtime = dir->i_ctime = CURRENT_TIME;
}
return error;
}
{
int retval = ramfs_mknod(dir, dentry, mode | S_IFDIR, 0);
if (!retval)
- dir->i_nlink++;
+ inc_nlink(dir);
return retval;
}
inode->i_gid = dir->i_gid;
d_instantiate(dentry, inode);
dget(dentry);
+ dir->i_mtime = dir->i_ctime = CURRENT_TIME;
} else
iput(inode);
}
return error;
}
-static struct address_space_operations ramfs_aops = {
- .readpage = simple_readpage,
- .prepare_write = simple_prepare_write,
- .commit_write = simple_commit_write
-};
-
-struct file_operations ramfs_file_operations = {
- .read = generic_file_read,
- .write = generic_file_write,
- .mmap = generic_file_mmap,
- .fsync = simple_sync_file,
- .sendfile = generic_file_sendfile,
- .llseek = generic_file_llseek,
-};
-
-static struct inode_operations ramfs_file_inode_operations = {
- .getattr = simple_getattr,
-};
-
-static struct inode_operations ramfs_dir_inode_operations = {
+static const struct inode_operations ramfs_dir_inode_operations = {
.create = ramfs_create,
.lookup = simple_lookup,
.link = simple_link,
.rename = simple_rename,
};
-static struct super_operations ramfs_ops = {
+static const struct super_operations ramfs_ops = {
.statfs = simple_statfs,
.drop_inode = generic_delete_inode,
+ .show_options = generic_show_options,
+};
+
+struct ramfs_mount_opts {
+ umode_t mode;
+};
+
+enum {
+ Opt_mode,
+ Opt_err
};
+static const match_table_t tokens = {
+ {Opt_mode, "mode=%o"},
+ {Opt_err, NULL}
+};
+
+struct ramfs_fs_info {
+ struct ramfs_mount_opts mount_opts;
+};
+
+static int ramfs_parse_options(char *data, struct ramfs_mount_opts *opts)
+{
+ substring_t args[MAX_OPT_ARGS];
+ int option;
+ int token;
+ char *p;
+
+ opts->mode = RAMFS_DEFAULT_MODE;
+
+ while ((p = strsep(&data, ",")) != NULL) {
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_mode:
+ if (match_octal(&args[0], &option))
+ return -EINVAL;
+ opts->mode = option & S_IALLUGO;
+ break;
+ default:
+ printk(KERN_ERR "ramfs: bad mount option: %s\n", p);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
static int ramfs_fill_super(struct super_block * sb, void * data, int silent)
{
- struct inode * inode;
- struct dentry * root;
-
- sb->s_maxbytes = MAX_LFS_FILESIZE;
- sb->s_blocksize = PAGE_CACHE_SIZE;
- sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
- sb->s_magic = RAMFS_MAGIC;
- sb->s_op = &ramfs_ops;
- sb->s_time_gran = 1;
- inode = ramfs_get_inode(sb, S_IFDIR | 0755, 0);
- if (!inode)
- return -ENOMEM;
+ struct ramfs_fs_info *fsi;
+ struct inode *inode = NULL;
+ struct dentry *root;
+ int err;
+
+ save_mount_options(sb, data);
+
+ fsi = kzalloc(sizeof(struct ramfs_fs_info), GFP_KERNEL);
+ sb->s_fs_info = fsi;
+ if (!fsi) {
+ err = -ENOMEM;
+ goto fail;
+ }
+
+ err = ramfs_parse_options(data, &fsi->mount_opts);
+ if (err)
+ goto fail;
+
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_blocksize = PAGE_CACHE_SIZE;
+ sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+ sb->s_magic = RAMFS_MAGIC;
+ sb->s_op = &ramfs_ops;
+ sb->s_time_gran = 1;
+
+ inode = ramfs_get_inode(sb, S_IFDIR | fsi->mount_opts.mode, 0);
+ if (!inode) {
+ err = -ENOMEM;
+ goto fail;
+ }
root = d_alloc_root(inode);
+ sb->s_root = root;
if (!root) {
- iput(inode);
- return -ENOMEM;
+ err = -ENOMEM;
+ goto fail;
}
- sb->s_root = root;
+
return 0;
+fail:
+ kfree(fsi);
+ sb->s_fs_info = NULL;
+ iput(inode);
+ return err;
}
-struct super_block *ramfs_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+int ramfs_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
- return get_sb_nodev(fs_type, flags, data, ramfs_fill_super);
+ return get_sb_nodev(fs_type, flags, data, ramfs_fill_super, mnt);
}
-static struct super_block *rootfs_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+static int rootfs_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
- return get_sb_nodev(fs_type, flags|MS_NOUSER, data, ramfs_fill_super);
+ return get_sb_nodev(fs_type, flags|MS_NOUSER, data, ramfs_fill_super,
+ mnt);
+}
+
+static void ramfs_kill_sb(struct super_block *sb)
+{
+ kfree(sb->s_fs_info);
+ kill_litter_super(sb);
}
static struct file_system_type ramfs_fs_type = {
.name = "ramfs",
.get_sb = ramfs_get_sb,
- .kill_sb = kill_litter_super,
+ .kill_sb = ramfs_kill_sb,
};
static struct file_system_type rootfs_fs_type = {
.name = "rootfs",
int __init init_rootfs(void)
{
- return register_filesystem(&rootfs_fs_type);
+ int err;
+
+ err = bdi_init(&ramfs_backing_dev_info);
+ if (err)
+ return err;
+
+ err = register_filesystem(&rootfs_fs_type);
+ if (err)
+ bdi_destroy(&ramfs_backing_dev_info);
+
+ return err;
}
MODULE_LICENSE("GPL");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff