diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/sysv/inode.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/sysv/inode.c | 380 |
1 files changed, 0 insertions, 380 deletions
diff --git a/ANDROID_3.4.5/fs/sysv/inode.c b/ANDROID_3.4.5/fs/sysv/inode.c deleted file mode 100644 index 3da5ce25..00000000 --- a/ANDROID_3.4.5/fs/sysv/inode.c +++ /dev/null @@ -1,380 +0,0 @@ -/* - * linux/fs/sysv/inode.c - * - * minix/inode.c - * Copyright (C) 1991, 1992 Linus Torvalds - * - * xenix/inode.c - * Copyright (C) 1992 Doug Evans - * - * coh/inode.c - * Copyright (C) 1993 Pascal Haible, Bruno Haible - * - * sysv/inode.c - * Copyright (C) 1993 Paul B. Monday - * - * sysv/inode.c - * Copyright (C) 1993 Bruno Haible - * Copyright (C) 1997, 1998 Krzysztof G. Baranowski - * - * This file contains code for allocating/freeing inodes and for read/writing - * the superblock. - */ - -#include <linux/highuid.h> -#include <linux/slab.h> -#include <linux/init.h> -#include <linux/buffer_head.h> -#include <linux/vfs.h> -#include <linux/writeback.h> -#include <linux/namei.h> -#include <asm/byteorder.h> -#include "sysv.h" - -static int sysv_sync_fs(struct super_block *sb, int wait) -{ - struct sysv_sb_info *sbi = SYSV_SB(sb); - unsigned long time = get_seconds(), old_time; - - lock_super(sb); - - /* - * If we are going to write out the super block, - * then attach current time stamp. - * But if the filesystem was marked clean, keep it clean. - */ - sb->s_dirt = 0; - old_time = fs32_to_cpu(sbi, *sbi->s_sb_time); - if (sbi->s_type == FSTYPE_SYSV4) { - if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time)) - *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time); - *sbi->s_sb_time = cpu_to_fs32(sbi, time); - mark_buffer_dirty(sbi->s_bh2); - } - - unlock_super(sb); - - return 0; -} - -static void sysv_write_super(struct super_block *sb) -{ - if (!(sb->s_flags & MS_RDONLY)) - sysv_sync_fs(sb, 1); - else - sb->s_dirt = 0; -} - -static int sysv_remount(struct super_block *sb, int *flags, char *data) -{ - struct sysv_sb_info *sbi = SYSV_SB(sb); - lock_super(sb); - if (sbi->s_forced_ro) - *flags |= MS_RDONLY; - if (*flags & MS_RDONLY) - sysv_write_super(sb); - unlock_super(sb); - return 0; -} - -static void sysv_put_super(struct super_block *sb) -{ - struct sysv_sb_info *sbi = SYSV_SB(sb); - - if (sb->s_dirt) - sysv_write_super(sb); - - if (!(sb->s_flags & MS_RDONLY)) { - /* XXX ext2 also updates the state here */ - mark_buffer_dirty(sbi->s_bh1); - if (sbi->s_bh1 != sbi->s_bh2) - mark_buffer_dirty(sbi->s_bh2); - } - - brelse(sbi->s_bh1); - if (sbi->s_bh1 != sbi->s_bh2) - brelse(sbi->s_bh2); - - kfree(sbi); -} - -static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf) -{ - struct super_block *sb = dentry->d_sb; - struct sysv_sb_info *sbi = SYSV_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_ndatazones; - buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb); - buf->f_files = sbi->s_ninodes; - buf->f_ffree = sysv_count_free_inodes(sb); - buf->f_namelen = SYSV_NAMELEN; - buf->f_fsid.val[0] = (u32)id; - buf->f_fsid.val[1] = (u32)(id >> 32); - return 0; -} - -/* - * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32 - */ -static inline void read3byte(struct sysv_sb_info *sbi, - unsigned char * from, unsigned char * to) -{ - if (sbi->s_bytesex == BYTESEX_PDP) { - to[0] = from[0]; - to[1] = 0; - to[2] = from[1]; - to[3] = from[2]; - } else if (sbi->s_bytesex == BYTESEX_LE) { - to[0] = from[0]; - to[1] = from[1]; - to[2] = from[2]; - to[3] = 0; - } else { - to[0] = 0; - to[1] = from[0]; - to[2] = from[1]; - to[3] = from[2]; - } -} - -static inline void write3byte(struct sysv_sb_info *sbi, - unsigned char * from, unsigned char * to) -{ - if (sbi->s_bytesex == BYTESEX_PDP) { - to[0] = from[0]; - to[1] = from[2]; - to[2] = from[3]; - } else if (sbi->s_bytesex == BYTESEX_LE) { - to[0] = from[0]; - to[1] = from[1]; - to[2] = from[2]; - } else { - to[0] = from[1]; - to[1] = from[2]; - to[2] = from[3]; - } -} - -static const struct inode_operations sysv_symlink_inode_operations = { - .readlink = generic_readlink, - .follow_link = page_follow_link_light, - .put_link = page_put_link, - .getattr = sysv_getattr, -}; - -void sysv_set_inode(struct inode *inode, dev_t rdev) -{ - if (S_ISREG(inode->i_mode)) { - inode->i_op = &sysv_file_inode_operations; - inode->i_fop = &sysv_file_operations; - inode->i_mapping->a_ops = &sysv_aops; - } else if (S_ISDIR(inode->i_mode)) { - inode->i_op = &sysv_dir_inode_operations; - inode->i_fop = &sysv_dir_operations; - inode->i_mapping->a_ops = &sysv_aops; - } else if (S_ISLNK(inode->i_mode)) { - if (inode->i_blocks) { - inode->i_op = &sysv_symlink_inode_operations; - inode->i_mapping->a_ops = &sysv_aops; - } else { - inode->i_op = &sysv_fast_symlink_inode_operations; - nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size, - sizeof(SYSV_I(inode)->i_data) - 1); - } - } else - init_special_inode(inode, inode->i_mode, rdev); -} - -struct inode *sysv_iget(struct super_block *sb, unsigned int ino) -{ - struct sysv_sb_info * sbi = SYSV_SB(sb); - struct buffer_head * bh; - struct sysv_inode * raw_inode; - struct sysv_inode_info * si; - struct inode *inode; - unsigned int block; - - if (!ino || ino > sbi->s_ninodes) { - printk("Bad inode number on dev %s: %d is out of range\n", - sb->s_id, ino); - return ERR_PTR(-EIO); - } - - inode = iget_locked(sb, ino); - if (!inode) - return ERR_PTR(-ENOMEM); - if (!(inode->i_state & I_NEW)) - return inode; - - raw_inode = sysv_raw_inode(sb, ino, &bh); - if (!raw_inode) { - printk("Major problem: unable to read inode from dev %s\n", - inode->i_sb->s_id); - goto bad_inode; - } - /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */ - inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode); - inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid); - inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid); - set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink)); - inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size); - inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime); - inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime); - inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime); - inode->i_ctime.tv_nsec = 0; - inode->i_atime.tv_nsec = 0; - inode->i_mtime.tv_nsec = 0; - inode->i_blocks = 0; - - si = SYSV_I(inode); - for (block = 0; block < 10+1+1+1; block++) - read3byte(sbi, &raw_inode->i_data[3*block], - (u8 *)&si->i_data[block]); - brelse(bh); - si->i_dir_start_lookup = 0; - if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) - sysv_set_inode(inode, - old_decode_dev(fs32_to_cpu(sbi, si->i_data[0]))); - else - sysv_set_inode(inode, 0); - unlock_new_inode(inode); - return inode; - -bad_inode: - iget_failed(inode); - return ERR_PTR(-EIO); -} - -static int __sysv_write_inode(struct inode *inode, int wait) -{ - struct super_block * sb = inode->i_sb; - struct sysv_sb_info * sbi = SYSV_SB(sb); - struct buffer_head * bh; - struct sysv_inode * raw_inode; - struct sysv_inode_info * si; - unsigned int ino, block; - int err = 0; - - ino = inode->i_ino; - if (!ino || ino > sbi->s_ninodes) { - printk("Bad inode number on dev %s: %d is out of range\n", - inode->i_sb->s_id, ino); - return -EIO; - } - raw_inode = sysv_raw_inode(sb, ino, &bh); - if (!raw_inode) { - printk("unable to read i-node block\n"); - return -EIO; - } - - raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode); - raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid)); - raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid)); - raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink); - raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size); - raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec); - raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec); - raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec); - - si = SYSV_I(inode); - if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) - si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev)); - for (block = 0; block < 10+1+1+1; block++) - write3byte(sbi, (u8 *)&si->i_data[block], - &raw_inode->i_data[3*block]); - mark_buffer_dirty(bh); - if (wait) { - sync_dirty_buffer(bh); - if (buffer_req(bh) && !buffer_uptodate(bh)) { - printk ("IO error syncing sysv inode [%s:%08x]\n", - sb->s_id, ino); - err = -EIO; - } - } - brelse(bh); - return 0; -} - -int sysv_write_inode(struct inode *inode, struct writeback_control *wbc) -{ - return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); -} - -int sysv_sync_inode(struct inode *inode) -{ - return __sysv_write_inode(inode, 1); -} - -static void sysv_evict_inode(struct inode *inode) -{ - truncate_inode_pages(&inode->i_data, 0); - if (!inode->i_nlink) { - inode->i_size = 0; - sysv_truncate(inode); - } - invalidate_inode_buffers(inode); - end_writeback(inode); - if (!inode->i_nlink) - sysv_free_inode(inode); -} - -static struct kmem_cache *sysv_inode_cachep; - -static struct inode *sysv_alloc_inode(struct super_block *sb) -{ - struct sysv_inode_info *si; - - si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL); - if (!si) - return NULL; - return &si->vfs_inode; -} - -static void sysv_i_callback(struct rcu_head *head) -{ - struct inode *inode = container_of(head, struct inode, i_rcu); - kmem_cache_free(sysv_inode_cachep, SYSV_I(inode)); -} - -static void sysv_destroy_inode(struct inode *inode) -{ - call_rcu(&inode->i_rcu, sysv_i_callback); -} - -static void init_once(void *p) -{ - struct sysv_inode_info *si = (struct sysv_inode_info *)p; - - inode_init_once(&si->vfs_inode); -} - -const struct super_operations sysv_sops = { - .alloc_inode = sysv_alloc_inode, - .destroy_inode = sysv_destroy_inode, - .write_inode = sysv_write_inode, - .evict_inode = sysv_evict_inode, - .put_super = sysv_put_super, - .write_super = sysv_write_super, - .sync_fs = sysv_sync_fs, - .remount_fs = sysv_remount, - .statfs = sysv_statfs, -}; - -int __init sysv_init_icache(void) -{ - sysv_inode_cachep = kmem_cache_create("sysv_inode_cache", - sizeof(struct sysv_inode_info), 0, - SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, - init_once); - if (!sysv_inode_cachep) - return -ENOMEM; - return 0; -} - -void sysv_destroy_icache(void) -{ - kmem_cache_destroy(sysv_inode_cachep); -} |