diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ramfs')
| -rw-r--r-- | ANDROID_3.4.5/fs/ramfs/Makefile | 9 | ||||
| -rw-r--r-- | ANDROID_3.4.5/fs/ramfs/file-mmu.c | 55 | ||||
| -rw-r--r-- | ANDROID_3.4.5/fs/ramfs/file-nommu.c | 267 | ||||
| -rw-r--r-- | ANDROID_3.4.5/fs/ramfs/inode.c | 289 | ||||
| -rw-r--r-- | ANDROID_3.4.5/fs/ramfs/internal.h | 14 |
5 files changed, 0 insertions, 634 deletions
diff --git a/ANDROID_3.4.5/fs/ramfs/Makefile b/ANDROID_3.4.5/fs/ramfs/Makefile deleted file mode 100644 index c71e65dc..00000000 --- a/ANDROID_3.4.5/fs/ramfs/Makefile +++ /dev/null @@ -1,9 +0,0 @@ -# -# Makefile for the linux ramfs routines. -# - -obj-y += ramfs.o - -file-mmu-y := file-nommu.o -file-mmu-$(CONFIG_MMU) := file-mmu.o -ramfs-objs += inode.o $(file-mmu-y) diff --git a/ANDROID_3.4.5/fs/ramfs/file-mmu.c b/ANDROID_3.4.5/fs/ramfs/file-mmu.c deleted file mode 100644 index 4884ac5a..00000000 --- a/ANDROID_3.4.5/fs/ramfs/file-mmu.c +++ /dev/null @@ -1,55 +0,0 @@ -/* file-mmu.c: ramfs MMU-based file operations - * - * 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/mm.h> -#include <linux/ramfs.h> - -#include "internal.h" - -const struct address_space_operations ramfs_aops = { - .readpage = simple_readpage, - .write_begin = simple_write_begin, - .write_end = simple_write_end, - .set_page_dirty = __set_page_dirty_no_writeback, -}; - -const struct file_operations ramfs_file_operations = { - .read = do_sync_read, - .aio_read = generic_file_aio_read, - .write = do_sync_write, - .aio_write = generic_file_aio_write, - .mmap = generic_file_mmap, - .fsync = noop_fsync, - .splice_read = generic_file_splice_read, - .splice_write = generic_file_splice_write, - .llseek = generic_file_llseek, -}; - -const struct inode_operations ramfs_file_inode_operations = { - .setattr = simple_setattr, - .getattr = simple_getattr, -}; diff --git a/ANDROID_3.4.5/fs/ramfs/file-nommu.c b/ANDROID_3.4.5/fs/ramfs/file-nommu.c deleted file mode 100644 index d5378d02..00000000 --- a/ANDROID_3.4.5/fs/ramfs/file-nommu.c +++ /dev/null @@ -1,267 +0,0 @@ -/* file-nommu.c: no-MMU version of ramfs - * - * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved. - * Written by David Howells (dhowells@redhat.com) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - -#include <linux/module.h> -#include <linux/fs.h> -#include <linux/mm.h> -#include <linux/pagemap.h> -#include <linux/highmem.h> -#include <linux/init.h> -#include <linux/string.h> -#include <linux/backing-dev.h> -#include <linux/ramfs.h> -#include <linux/pagevec.h> -#include <linux/mman.h> -#include <linux/sched.h> -#include <linux/slab.h> - -#include <asm/uaccess.h> -#include "internal.h" - -static int ramfs_nommu_setattr(struct dentry *, struct iattr *); - -const struct address_space_operations ramfs_aops = { - .readpage = simple_readpage, - .write_begin = simple_write_begin, - .write_end = simple_write_end, - .set_page_dirty = __set_page_dirty_no_writeback, -}; - -const struct file_operations ramfs_file_operations = { - .mmap = ramfs_nommu_mmap, - .get_unmapped_area = ramfs_nommu_get_unmapped_area, - .read = do_sync_read, - .aio_read = generic_file_aio_read, - .write = do_sync_write, - .aio_write = generic_file_aio_write, - .fsync = noop_fsync, - .splice_read = generic_file_splice_read, - .splice_write = generic_file_splice_write, - .llseek = generic_file_llseek, -}; - -const struct inode_operations ramfs_file_inode_operations = { - .setattr = ramfs_nommu_setattr, - .getattr = simple_getattr, -}; - -/*****************************************************************************/ -/* - * add a contiguous set of pages into a ramfs inode when it's truncated from - * size 0 on the assumption that it's going to be used for an mmap of shared - * memory - */ -int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize) -{ - unsigned long npages, xpages, loop; - struct page *pages; - unsigned order; - void *data; - int ret; - - /* make various checks */ - order = get_order(newsize); - if (unlikely(order >= MAX_ORDER)) - return -EFBIG; - - ret = inode_newsize_ok(inode, newsize); - if (ret) - return ret; - - i_size_write(inode, newsize); - - /* allocate enough contiguous pages to be able to satisfy the - * request */ - pages = alloc_pages(mapping_gfp_mask(inode->i_mapping), order); - if (!pages) - return -ENOMEM; - - /* split the high-order page into an array of single pages */ - xpages = 1UL << order; - npages = (newsize + PAGE_SIZE - 1) >> PAGE_SHIFT; - - split_page(pages, order); - - /* trim off any pages we don't actually require */ - for (loop = npages; loop < xpages; loop++) - __free_page(pages + loop); - - /* clear the memory we allocated */ - newsize = PAGE_SIZE * npages; - data = page_address(pages); - memset(data, 0, newsize); - - /* attach all the pages to the inode's address space */ - for (loop = 0; loop < npages; loop++) { - struct page *page = pages + loop; - - ret = add_to_page_cache_lru(page, inode->i_mapping, loop, - GFP_KERNEL); - if (ret < 0) - goto add_error; - - /* prevent the page from being discarded on memory pressure */ - SetPageDirty(page); - SetPageUptodate(page); - - unlock_page(page); - put_page(page); - } - - return 0; - -add_error: - while (loop < npages) - __free_page(pages + loop++); - return ret; -} - -/*****************************************************************************/ -/* - * - */ -static int ramfs_nommu_resize(struct inode *inode, loff_t newsize, loff_t size) -{ - int ret; - - /* assume a truncate from zero size is going to be for the purposes of - * shared mmap */ - if (size == 0) { - if (unlikely(newsize >> 32)) - return -EFBIG; - - return ramfs_nommu_expand_for_mapping(inode, newsize); - } - - /* check that a decrease in size doesn't cut off any shared mappings */ - if (newsize < size) { - ret = nommu_shrink_inode_mappings(inode, size, newsize); - if (ret < 0) - return ret; - } - - truncate_setsize(inode, newsize); - return 0; -} - -/*****************************************************************************/ -/* - * handle a change of attributes - * - we're specifically interested in a change of size - */ -static int ramfs_nommu_setattr(struct dentry *dentry, struct iattr *ia) -{ - struct inode *inode = dentry->d_inode; - unsigned int old_ia_valid = ia->ia_valid; - int ret = 0; - - /* POSIX UID/GID verification for setting inode attributes */ - ret = inode_change_ok(inode, ia); - if (ret) - return ret; - - /* pick out size-changing events */ - if (ia->ia_valid & ATTR_SIZE) { - loff_t size = inode->i_size; - - if (ia->ia_size != size) { - ret = ramfs_nommu_resize(inode, ia->ia_size, size); - if (ret < 0 || ia->ia_valid == ATTR_SIZE) - goto out; - } else { - /* we skipped the truncate but must still update - * timestamps - */ - ia->ia_valid |= ATTR_MTIME|ATTR_CTIME; - } - } - - setattr_copy(inode, ia); - out: - ia->ia_valid = old_ia_valid; - return ret; -} - -/*****************************************************************************/ -/* - * try to determine where a shared mapping can be made - * - we require that: - * - the pages to be mapped must exist - * - the pages be physically contiguous in sequence - */ -unsigned long ramfs_nommu_get_unmapped_area(struct file *file, - unsigned long addr, unsigned long len, - unsigned long pgoff, unsigned long flags) -{ - unsigned long maxpages, lpages, nr, loop, ret; - struct inode *inode = file->f_path.dentry->d_inode; - struct page **pages = NULL, **ptr, *page; - loff_t isize; - - if (!(flags & MAP_SHARED)) - return addr; - - /* the mapping mustn't extend beyond the EOF */ - lpages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; - isize = i_size_read(inode); - - ret = -EINVAL; - maxpages = (isize + PAGE_SIZE - 1) >> PAGE_SHIFT; - if (pgoff >= maxpages) - goto out; - - if (maxpages - pgoff < lpages) - goto out; - - /* gang-find the pages */ - ret = -ENOMEM; - pages = kzalloc(lpages * sizeof(struct page *), GFP_KERNEL); - if (!pages) - goto out_free; - - nr = find_get_pages(inode->i_mapping, pgoff, lpages, pages); - if (nr != lpages) - goto out_free_pages; /* leave if some pages were missing */ - - /* check the pages for physical adjacency */ - ptr = pages; - page = *ptr++; - page++; - for (loop = lpages; loop > 1; loop--) - if (*ptr++ != page++) - goto out_free_pages; - - /* okay - all conditions fulfilled */ - ret = (unsigned long) page_address(pages[0]); - -out_free_pages: - ptr = pages; - for (loop = nr; loop > 0; loop--) - put_page(*ptr++); -out_free: - kfree(pages); -out: - return ret; -} - -/*****************************************************************************/ -/* - * set up a mapping for shared memory segments - */ -int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma) -{ - if (!(vma->vm_flags & VM_SHARED)) - return -ENOSYS; - - file_accessed(file); - vma->vm_ops = &generic_file_vm_ops; - return 0; -} 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; -} diff --git a/ANDROID_3.4.5/fs/ramfs/internal.h b/ANDROID_3.4.5/fs/ramfs/internal.h deleted file mode 100644 index 6b330639..00000000 --- a/ANDROID_3.4.5/fs/ramfs/internal.h +++ /dev/null @@ -1,14 +0,0 @@ -/* internal.h: ramfs internal definitions - * - * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved. - * Written by David Howells (dhowells@redhat.com) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - - -extern const struct address_space_operations ramfs_aops; -extern const struct inode_operations ramfs_file_inode_operations; |