diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/minix/inode.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/minix/inode.c | 676 |
1 files changed, 0 insertions, 676 deletions
diff --git a/ANDROID_3.4.5/fs/minix/inode.c b/ANDROID_3.4.5/fs/minix/inode.c deleted file mode 100644 index fcb05d2c..00000000 --- a/ANDROID_3.4.5/fs/minix/inode.c +++ /dev/null @@ -1,676 +0,0 @@ -/* - * linux/fs/minix/inode.c - * - * Copyright (C) 1991, 1992 Linus Torvalds - * - * Copyright (C) 1996 Gertjan van Wingerde - * Minix V2 fs support. - * - * Modified for 680x0 by Andreas Schwab - * Updated to filesystem version 3 by Daniel Aragones - */ - -#include <linux/module.h> -#include "minix.h" -#include <linux/buffer_head.h> -#include <linux/slab.h> -#include <linux/init.h> -#include <linux/highuid.h> -#include <linux/vfs.h> -#include <linux/writeback.h> - -static int minix_write_inode(struct inode *inode, - struct writeback_control *wbc); -static int minix_statfs(struct dentry *dentry, struct kstatfs *buf); -static int minix_remount (struct super_block * sb, int * flags, char * data); - -static void minix_evict_inode(struct inode *inode) -{ - truncate_inode_pages(&inode->i_data, 0); - if (!inode->i_nlink) { - inode->i_size = 0; - minix_truncate(inode); - } - invalidate_inode_buffers(inode); - end_writeback(inode); - if (!inode->i_nlink) - minix_free_inode(inode); -} - -static void minix_put_super(struct super_block *sb) -{ - int i; - struct minix_sb_info *sbi = minix_sb(sb); - - if (!(sb->s_flags & MS_RDONLY)) { - if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ - sbi->s_ms->s_state = sbi->s_mount_state; - mark_buffer_dirty(sbi->s_sbh); - } - for (i = 0; i < sbi->s_imap_blocks; i++) - brelse(sbi->s_imap[i]); - for (i = 0; i < sbi->s_zmap_blocks; i++) - brelse(sbi->s_zmap[i]); - brelse (sbi->s_sbh); - kfree(sbi->s_imap); - sb->s_fs_info = NULL; - kfree(sbi); -} - -static struct kmem_cache * minix_inode_cachep; - -static struct inode *minix_alloc_inode(struct super_block *sb) -{ - struct minix_inode_info *ei; - ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL); - if (!ei) - return NULL; - return &ei->vfs_inode; -} - -static void minix_i_callback(struct rcu_head *head) -{ - struct inode *inode = container_of(head, struct inode, i_rcu); - kmem_cache_free(minix_inode_cachep, minix_i(inode)); -} - -static void minix_destroy_inode(struct inode *inode) -{ - call_rcu(&inode->i_rcu, minix_i_callback); -} - -static void init_once(void *foo) -{ - struct minix_inode_info *ei = (struct minix_inode_info *) foo; - - inode_init_once(&ei->vfs_inode); -} - -static int init_inodecache(void) -{ - minix_inode_cachep = kmem_cache_create("minix_inode_cache", - sizeof(struct minix_inode_info), - 0, (SLAB_RECLAIM_ACCOUNT| - SLAB_MEM_SPREAD), - init_once); - if (minix_inode_cachep == NULL) - return -ENOMEM; - return 0; -} - -static void destroy_inodecache(void) -{ - kmem_cache_destroy(minix_inode_cachep); -} - -static const struct super_operations minix_sops = { - .alloc_inode = minix_alloc_inode, - .destroy_inode = minix_destroy_inode, - .write_inode = minix_write_inode, - .evict_inode = minix_evict_inode, - .put_super = minix_put_super, - .statfs = minix_statfs, - .remount_fs = minix_remount, -}; - -static int minix_remount (struct super_block * sb, int * flags, char * data) -{ - struct minix_sb_info * sbi = minix_sb(sb); - struct minix_super_block * ms; - - ms = sbi->s_ms; - if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) - return 0; - if (*flags & MS_RDONLY) { - if (ms->s_state & MINIX_VALID_FS || - !(sbi->s_mount_state & MINIX_VALID_FS)) - return 0; - /* Mounting a rw partition read-only. */ - if (sbi->s_version != MINIX_V3) - ms->s_state = sbi->s_mount_state; - mark_buffer_dirty(sbi->s_sbh); - } else { - /* Mount a partition which is read-only, read-write. */ - if (sbi->s_version != MINIX_V3) { - sbi->s_mount_state = ms->s_state; - ms->s_state &= ~MINIX_VALID_FS; - } else { - sbi->s_mount_state = MINIX_VALID_FS; - } - mark_buffer_dirty(sbi->s_sbh); - - if (!(sbi->s_mount_state & MINIX_VALID_FS)) - printk("MINIX-fs warning: remounting unchecked fs, " - "running fsck is recommended\n"); - else if ((sbi->s_mount_state & MINIX_ERROR_FS)) - printk("MINIX-fs warning: remounting fs with errors, " - "running fsck is recommended\n"); - } - return 0; -} - -static int minix_fill_super(struct super_block *s, void *data, int silent) -{ - struct buffer_head *bh; - struct buffer_head **map; - struct minix_super_block *ms; - struct minix3_super_block *m3s = NULL; - unsigned long i, block; - struct inode *root_inode; - struct minix_sb_info *sbi; - int ret = -EINVAL; - - sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); - if (!sbi) - return -ENOMEM; - s->s_fs_info = sbi; - - BUILD_BUG_ON(32 != sizeof (struct minix_inode)); - BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); - - if (!sb_set_blocksize(s, BLOCK_SIZE)) - goto out_bad_hblock; - - if (!(bh = sb_bread(s, 1))) - goto out_bad_sb; - - ms = (struct minix_super_block *) bh->b_data; - sbi->s_ms = ms; - sbi->s_sbh = bh; - sbi->s_mount_state = ms->s_state; - sbi->s_ninodes = ms->s_ninodes; - sbi->s_nzones = ms->s_nzones; - sbi->s_imap_blocks = ms->s_imap_blocks; - sbi->s_zmap_blocks = ms->s_zmap_blocks; - sbi->s_firstdatazone = ms->s_firstdatazone; - sbi->s_log_zone_size = ms->s_log_zone_size; - sbi->s_max_size = ms->s_max_size; - s->s_magic = ms->s_magic; - if (s->s_magic == MINIX_SUPER_MAGIC) { - sbi->s_version = MINIX_V1; - sbi->s_dirsize = 16; - sbi->s_namelen = 14; - s->s_max_links = MINIX_LINK_MAX; - } else if (s->s_magic == MINIX_SUPER_MAGIC2) { - sbi->s_version = MINIX_V1; - sbi->s_dirsize = 32; - sbi->s_namelen = 30; - s->s_max_links = MINIX_LINK_MAX; - } else if (s->s_magic == MINIX2_SUPER_MAGIC) { - sbi->s_version = MINIX_V2; - sbi->s_nzones = ms->s_zones; - sbi->s_dirsize = 16; - sbi->s_namelen = 14; - s->s_max_links = MINIX2_LINK_MAX; - } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { - sbi->s_version = MINIX_V2; - sbi->s_nzones = ms->s_zones; - sbi->s_dirsize = 32; - sbi->s_namelen = 30; - s->s_max_links = MINIX2_LINK_MAX; - } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { - m3s = (struct minix3_super_block *) bh->b_data; - s->s_magic = m3s->s_magic; - sbi->s_imap_blocks = m3s->s_imap_blocks; - sbi->s_zmap_blocks = m3s->s_zmap_blocks; - sbi->s_firstdatazone = m3s->s_firstdatazone; - sbi->s_log_zone_size = m3s->s_log_zone_size; - sbi->s_max_size = m3s->s_max_size; - sbi->s_ninodes = m3s->s_ninodes; - sbi->s_nzones = m3s->s_zones; - sbi->s_dirsize = 64; - sbi->s_namelen = 60; - sbi->s_version = MINIX_V3; - sbi->s_mount_state = MINIX_VALID_FS; - sb_set_blocksize(s, m3s->s_blocksize); - s->s_max_links = MINIX2_LINK_MAX; - } else - goto out_no_fs; - - /* - * Allocate the buffer map to keep the superblock small. - */ - if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) - goto out_illegal_sb; - i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); - map = kzalloc(i, GFP_KERNEL); - if (!map) - goto out_no_map; - sbi->s_imap = &map[0]; - sbi->s_zmap = &map[sbi->s_imap_blocks]; - - block=2; - for (i=0 ; i < sbi->s_imap_blocks ; i++) { - if (!(sbi->s_imap[i]=sb_bread(s, block))) - goto out_no_bitmap; - block++; - } - for (i=0 ; i < sbi->s_zmap_blocks ; i++) { - if (!(sbi->s_zmap[i]=sb_bread(s, block))) - goto out_no_bitmap; - block++; - } - - minix_set_bit(0,sbi->s_imap[0]->b_data); - minix_set_bit(0,sbi->s_zmap[0]->b_data); - - /* Apparently minix can create filesystems that allocate more blocks for - * the bitmaps than needed. We simply ignore that, but verify it didn't - * create one with not enough blocks and bail out if so. - */ - block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize); - if (sbi->s_imap_blocks < block) { - printk("MINIX-fs: file system does not have enough " - "imap blocks allocated. Refusing to mount\n"); - goto out_no_bitmap; - } - - block = minix_blocks_needed( - (sbi->s_nzones - (sbi->s_firstdatazone + 1)), - s->s_blocksize); - if (sbi->s_zmap_blocks < block) { - printk("MINIX-fs: file system does not have enough " - "zmap blocks allocated. Refusing to mount.\n"); - goto out_no_bitmap; - } - - /* set up enough so that it can read an inode */ - s->s_op = &minix_sops; - root_inode = minix_iget(s, MINIX_ROOT_INO); - if (IS_ERR(root_inode)) { - ret = PTR_ERR(root_inode); - goto out_no_root; - } - - ret = -ENOMEM; - s->s_root = d_make_root(root_inode); - if (!s->s_root) - goto out_no_root; - - if (!(s->s_flags & MS_RDONLY)) { - if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ - ms->s_state &= ~MINIX_VALID_FS; - mark_buffer_dirty(bh); - } - if (!(sbi->s_mount_state & MINIX_VALID_FS)) - printk("MINIX-fs: mounting unchecked file system, " - "running fsck is recommended\n"); - else if (sbi->s_mount_state & MINIX_ERROR_FS) - printk("MINIX-fs: mounting file system with errors, " - "running fsck is recommended\n"); - - return 0; - -out_no_root: - if (!silent) - printk("MINIX-fs: get root inode failed\n"); - goto out_freemap; - -out_no_bitmap: - printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); -out_freemap: - for (i = 0; i < sbi->s_imap_blocks; i++) - brelse(sbi->s_imap[i]); - for (i = 0; i < sbi->s_zmap_blocks; i++) - brelse(sbi->s_zmap[i]); - kfree(sbi->s_imap); - goto out_release; - -out_no_map: - ret = -ENOMEM; - if (!silent) - printk("MINIX-fs: can't allocate map\n"); - goto out_release; - -out_illegal_sb: - if (!silent) - printk("MINIX-fs: bad superblock\n"); - goto out_release; - -out_no_fs: - if (!silent) - printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " - "on device %s.\n", s->s_id); -out_release: - brelse(bh); - goto out; - -out_bad_hblock: - printk("MINIX-fs: blocksize too small for device\n"); - goto out; - -out_bad_sb: - printk("MINIX-fs: unable to read superblock\n"); -out: - s->s_fs_info = NULL; - kfree(sbi); - return ret; -} - -static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) -{ - struct super_block *sb = dentry->d_sb; - struct minix_sb_info *sbi = minix_sb(sb); - u64 id = huge_encode_dev(sb->s_bdev->bd_dev); - buf->f_type = sb->s_magic; - buf->f_bsize = sb->s_blocksize; - buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; - buf->f_bfree = minix_count_free_blocks(sb); - buf->f_bavail = buf->f_bfree; - buf->f_files = sbi->s_ninodes; - buf->f_ffree = minix_count_free_inodes(sb); - buf->f_namelen = sbi->s_namelen; - buf->f_fsid.val[0] = (u32)id; - buf->f_fsid.val[1] = (u32)(id >> 32); - - return 0; -} - -static int minix_get_block(struct inode *inode, sector_t block, - struct buffer_head *bh_result, int create) -{ - if (INODE_VERSION(inode) == MINIX_V1) - return V1_minix_get_block(inode, block, bh_result, create); - else - return V2_minix_get_block(inode, block, bh_result, create); -} - -static int minix_writepage(struct page *page, struct writeback_control *wbc) -{ - return block_write_full_page(page, minix_get_block, wbc); -} - -static int minix_readpage(struct file *file, struct page *page) -{ - return block_read_full_page(page,minix_get_block); -} - -int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len) -{ - return __block_write_begin(page, pos, len, minix_get_block); -} - -static int minix_write_begin(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata) -{ - int ret; - - ret = block_write_begin(mapping, pos, len, flags, pagep, - minix_get_block); - if (unlikely(ret)) { - loff_t isize = mapping->host->i_size; - if (pos + len > isize) - vmtruncate(mapping->host, isize); - } - - return ret; -} - -static sector_t minix_bmap(struct address_space *mapping, sector_t block) -{ - return generic_block_bmap(mapping,block,minix_get_block); -} - -static const struct address_space_operations minix_aops = { - .readpage = minix_readpage, - .writepage = minix_writepage, - .write_begin = minix_write_begin, - .write_end = generic_write_end, - .bmap = minix_bmap -}; - -static const struct inode_operations minix_symlink_inode_operations = { - .readlink = generic_readlink, - .follow_link = page_follow_link_light, - .put_link = page_put_link, - .getattr = minix_getattr, -}; - -void minix_set_inode(struct inode *inode, dev_t rdev) -{ - if (S_ISREG(inode->i_mode)) { - inode->i_op = &minix_file_inode_operations; - inode->i_fop = &minix_file_operations; - inode->i_mapping->a_ops = &minix_aops; - } else if (S_ISDIR(inode->i_mode)) { - inode->i_op = &minix_dir_inode_operations; - inode->i_fop = &minix_dir_operations; - inode->i_mapping->a_ops = &minix_aops; - } else if (S_ISLNK(inode->i_mode)) { - inode->i_op = &minix_symlink_inode_operations; - inode->i_mapping->a_ops = &minix_aops; - } else - init_special_inode(inode, inode->i_mode, rdev); -} - -/* - * The minix V1 function to read an inode. - */ -static struct inode *V1_minix_iget(struct inode *inode) -{ - struct buffer_head * bh; - struct minix_inode * raw_inode; - struct minix_inode_info *minix_inode = minix_i(inode); - int i; - - raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); - if (!raw_inode) { - iget_failed(inode); - return ERR_PTR(-EIO); - } - inode->i_mode = raw_inode->i_mode; - inode->i_uid = (uid_t)raw_inode->i_uid; - inode->i_gid = (gid_t)raw_inode->i_gid; - set_nlink(inode, raw_inode->i_nlinks); - inode->i_size = raw_inode->i_size; - inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time; - inode->i_mtime.tv_nsec = 0; - inode->i_atime.tv_nsec = 0; - inode->i_ctime.tv_nsec = 0; - inode->i_blocks = 0; - for (i = 0; i < 9; i++) - minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; - minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); - brelse(bh); - unlock_new_inode(inode); - return inode; -} - -/* - * The minix V2 function to read an inode. - */ -static struct inode *V2_minix_iget(struct inode *inode) -{ - struct buffer_head * bh; - struct minix2_inode * raw_inode; - struct minix_inode_info *minix_inode = minix_i(inode); - int i; - - raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); - if (!raw_inode) { - iget_failed(inode); - return ERR_PTR(-EIO); - } - inode->i_mode = raw_inode->i_mode; - inode->i_uid = (uid_t)raw_inode->i_uid; - inode->i_gid = (gid_t)raw_inode->i_gid; - set_nlink(inode, raw_inode->i_nlinks); - inode->i_size = raw_inode->i_size; - inode->i_mtime.tv_sec = raw_inode->i_mtime; - inode->i_atime.tv_sec = raw_inode->i_atime; - inode->i_ctime.tv_sec = raw_inode->i_ctime; - inode->i_mtime.tv_nsec = 0; - inode->i_atime.tv_nsec = 0; - inode->i_ctime.tv_nsec = 0; - inode->i_blocks = 0; - for (i = 0; i < 10; i++) - minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; - minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); - brelse(bh); - unlock_new_inode(inode); - return inode; -} - -/* - * The global function to read an inode. - */ -struct inode *minix_iget(struct super_block *sb, unsigned long ino) -{ - struct inode *inode; - - inode = iget_locked(sb, ino); - if (!inode) - return ERR_PTR(-ENOMEM); - if (!(inode->i_state & I_NEW)) - return inode; - - if (INODE_VERSION(inode) == MINIX_V1) - return V1_minix_iget(inode); - else - return V2_minix_iget(inode); -} - -/* - * The minix V1 function to synchronize an inode. - */ -static struct buffer_head * V1_minix_update_inode(struct inode * inode) -{ - struct buffer_head * bh; - struct minix_inode * raw_inode; - struct minix_inode_info *minix_inode = minix_i(inode); - int i; - - raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); - if (!raw_inode) - return NULL; - raw_inode->i_mode = inode->i_mode; - raw_inode->i_uid = fs_high2lowuid(inode->i_uid); - raw_inode->i_gid = fs_high2lowgid(inode->i_gid); - raw_inode->i_nlinks = inode->i_nlink; - raw_inode->i_size = inode->i_size; - raw_inode->i_time = inode->i_mtime.tv_sec; - if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) - raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); - else for (i = 0; i < 9; i++) - raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; - mark_buffer_dirty(bh); - return bh; -} - -/* - * The minix V2 function to synchronize an inode. - */ -static struct buffer_head * V2_minix_update_inode(struct inode * inode) -{ - struct buffer_head * bh; - struct minix2_inode * raw_inode; - struct minix_inode_info *minix_inode = minix_i(inode); - int i; - - raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); - if (!raw_inode) - return NULL; - raw_inode->i_mode = inode->i_mode; - raw_inode->i_uid = fs_high2lowuid(inode->i_uid); - raw_inode->i_gid = fs_high2lowgid(inode->i_gid); - raw_inode->i_nlinks = inode->i_nlink; - raw_inode->i_size = inode->i_size; - raw_inode->i_mtime = inode->i_mtime.tv_sec; - raw_inode->i_atime = inode->i_atime.tv_sec; - raw_inode->i_ctime = inode->i_ctime.tv_sec; - if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) - raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); - else for (i = 0; i < 10; i++) - raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; - mark_buffer_dirty(bh); - return bh; -} - -static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) -{ - int err = 0; - struct buffer_head *bh; - - if (INODE_VERSION(inode) == MINIX_V1) - bh = V1_minix_update_inode(inode); - else - bh = V2_minix_update_inode(inode); - if (!bh) - return -EIO; - if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) { - sync_dirty_buffer(bh); - if (buffer_req(bh) && !buffer_uptodate(bh)) { - printk("IO error syncing minix inode [%s:%08lx]\n", - inode->i_sb->s_id, inode->i_ino); - err = -EIO; - } - } - brelse (bh); - return err; -} - -int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) -{ - struct super_block *sb = dentry->d_sb; - generic_fillattr(dentry->d_inode, stat); - if (INODE_VERSION(dentry->d_inode) == MINIX_V1) - stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); - else - stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); - stat->blksize = sb->s_blocksize; - return 0; -} - -/* - * The function that is called for file truncation. - */ -void minix_truncate(struct inode * inode) -{ - if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) - return; - if (INODE_VERSION(inode) == MINIX_V1) - V1_minix_truncate(inode); - else - V2_minix_truncate(inode); -} - -static struct dentry *minix_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) -{ - return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super); -} - -static struct file_system_type minix_fs_type = { - .owner = THIS_MODULE, - .name = "minix", - .mount = minix_mount, - .kill_sb = kill_block_super, - .fs_flags = FS_REQUIRES_DEV, -}; - -static int __init init_minix_fs(void) -{ - int err = init_inodecache(); - if (err) - goto out1; - err = register_filesystem(&minix_fs_type); - if (err) - goto out; - return 0; -out: - destroy_inodecache(); -out1: - return err; -} - -static void __exit exit_minix_fs(void) -{ - unregister_filesystem(&minix_fs_type); - destroy_inodecache(); -} - -module_init(init_minix_fs) -module_exit(exit_minix_fs) -MODULE_LICENSE("GPL"); - |