diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ramfs/inode.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ramfs/inode.c | 289 |
1 files changed, 0 insertions, 289 deletions
diff --git a/ANDROID_3.4.5/fs/ramfs/inode.c b/ANDROID_3.4.5/fs/ramfs/inode.c deleted file mode 100644 index a1fdabe2..00000000 --- a/ANDROID_3.4.5/fs/ramfs/inode.c +++ /dev/null @@ -1,289 +0,0 @@ -/* - * Resizable simple ram filesystem for Linux. - * - * Copyright (C) 2000 Linus Torvalds. - * 2000 Transmeta Corp. - * - * Usage limits added by David Gibson, Linuxcare Australia. - * This file is released under the GPL. - */ - -/* - * NOTE! This filesystem is probably most useful - * not as a real filesystem, but as an example of - * how virtual filesystems can be written. - * - * It doesn't get much simpler than this. Consider - * that this file implements the full semantics of - * a POSIX-compliant read-write filesystem. - * - * Note in particular how the filesystem does not - * need to implement any data structures of its own - * to keep track of the virtual data: using the VFS - * caches is sufficient. - */ - -#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/backing-dev.h> -#include <linux/ramfs.h> -#include <linux/sched.h> -#include <linux/parser.h> -#include <linux/magic.h> -#include <linux/slab.h> -#include <asm/uaccess.h> -#include "internal.h" - -#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 = { - .name = "ramfs", - .ra_pages = 0, /* No readahead */ - .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, -}; - -struct inode *ramfs_get_inode(struct super_block *sb, - const struct inode *dir, umode_t mode, dev_t dev) -{ - struct inode * inode = new_inode(sb); - - if (inode) { - inode->i_ino = get_next_ino(); - inode_init_owner(inode, dir, mode); - 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: - init_special_inode(inode, mode, dev); - break; - case S_IFREG: - inode->i_op = &ramfs_file_inode_operations; - inode->i_fop = &ramfs_file_operations; - break; - case S_IFDIR: - inode->i_op = &ramfs_dir_inode_operations; - inode->i_fop = &simple_dir_operations; - - /* directory inodes start off with i_nlink == 2 (for "." entry) */ - inc_nlink(inode); - break; - case S_IFLNK: - inode->i_op = &page_symlink_inode_operations; - break; - } - } - return inode; -} - -/* - * File creation. Allocate an inode, and we're done.. - */ -/* SMP-safe */ -static int -ramfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) -{ - struct inode * inode = ramfs_get_inode(dir->i_sb, dir, mode, dev); - int error = -ENOSPC; - - if (inode) { - 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; -} - -static int ramfs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode) -{ - int retval = ramfs_mknod(dir, dentry, mode | S_IFDIR, 0); - if (!retval) - inc_nlink(dir); - return retval; -} - -static int ramfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, struct nameidata *nd) -{ - return ramfs_mknod(dir, dentry, mode | S_IFREG, 0); -} - -static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname) -{ - struct inode *inode; - int error = -ENOSPC; - - inode = ramfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0); - if (inode) { - int l = strlen(symname)+1; - error = page_symlink(inode, symname, l); - if (!error) { - d_instantiate(dentry, inode); - dget(dentry); - dir->i_mtime = dir->i_ctime = CURRENT_TIME; - } else - iput(inode); - } - return error; -} - -static const struct inode_operations ramfs_dir_inode_operations = { - .create = ramfs_create, - .lookup = simple_lookup, - .link = simple_link, - .unlink = simple_unlink, - .symlink = ramfs_symlink, - .mkdir = ramfs_mkdir, - .rmdir = simple_rmdir, - .mknod = ramfs_mknod, - .rename = simple_rename, -}; - -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; - /* - * We might like to report bad mount options here; - * but traditionally ramfs has ignored all mount options, - * and as it is used as a !CONFIG_SHMEM simple substitute - * for tmpfs, better continue to ignore other mount options. - */ - } - } - - return 0; -} - -int ramfs_fill_super(struct super_block *sb, void *data, int silent) -{ - struct ramfs_fs_info *fsi; - struct inode *inode; - int err; - - save_mount_options(sb, data); - - fsi = kzalloc(sizeof(struct ramfs_fs_info), GFP_KERNEL); - sb->s_fs_info = fsi; - if (!fsi) - return -ENOMEM; - - err = ramfs_parse_options(data, &fsi->mount_opts); - if (err) - return err; - - 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, NULL, S_IFDIR | fsi->mount_opts.mode, 0); - sb->s_root = d_make_root(inode); - if (!sb->s_root) - return -ENOMEM; - - return 0; -} - -struct dentry *ramfs_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) -{ - return mount_nodev(fs_type, flags, data, ramfs_fill_super); -} - -static struct dentry *rootfs_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) -{ - return mount_nodev(fs_type, flags|MS_NOUSER, data, ramfs_fill_super); -} - -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", - .mount = ramfs_mount, - .kill_sb = ramfs_kill_sb, -}; -static struct file_system_type rootfs_fs_type = { - .name = "rootfs", - .mount = rootfs_mount, - .kill_sb = kill_litter_super, -}; - -static int __init init_ramfs_fs(void) -{ - return register_filesystem(&ramfs_fs_type); -} -module_init(init_ramfs_fs) - -int __init init_rootfs(void) -{ - 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; -} |