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357 lines
9.1 KiB
357 lines
9.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/sysv/inode.c |
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* |
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* minix/inode.c |
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* Copyright (C) 1991, 1992 Linus Torvalds |
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* |
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* xenix/inode.c |
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* Copyright (C) 1992 Doug Evans |
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* |
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* coh/inode.c |
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* Copyright (C) 1993 Pascal Haible, Bruno Haible |
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* |
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* sysv/inode.c |
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* Copyright (C) 1993 Paul B. Monday |
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* |
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* sysv/inode.c |
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* Copyright (C) 1993 Bruno Haible |
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* Copyright (C) 1997, 1998 Krzysztof G. Baranowski |
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* |
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* This file contains code for allocating/freeing inodes and for read/writing |
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* the superblock. |
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*/ |
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#include <linux/highuid.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/buffer_head.h> |
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#include <linux/vfs.h> |
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#include <linux/writeback.h> |
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#include <linux/namei.h> |
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#include <asm/byteorder.h> |
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#include "sysv.h" |
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static int sysv_sync_fs(struct super_block *sb, int wait) |
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{ |
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struct sysv_sb_info *sbi = SYSV_SB(sb); |
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u32 time = (u32)ktime_get_real_seconds(), old_time; |
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mutex_lock(&sbi->s_lock); |
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/* |
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* If we are going to write out the super block, |
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* then attach current time stamp. |
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* But if the filesystem was marked clean, keep it clean. |
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*/ |
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old_time = fs32_to_cpu(sbi, *sbi->s_sb_time); |
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if (sbi->s_type == FSTYPE_SYSV4) { |
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if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38u - old_time)) |
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*sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38u - time); |
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*sbi->s_sb_time = cpu_to_fs32(sbi, time); |
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mark_buffer_dirty(sbi->s_bh2); |
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} |
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mutex_unlock(&sbi->s_lock); |
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return 0; |
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} |
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static int sysv_remount(struct super_block *sb, int *flags, char *data) |
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{ |
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struct sysv_sb_info *sbi = SYSV_SB(sb); |
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sync_filesystem(sb); |
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if (sbi->s_forced_ro) |
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*flags |= SB_RDONLY; |
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return 0; |
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} |
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static void sysv_put_super(struct super_block *sb) |
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{ |
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struct sysv_sb_info *sbi = SYSV_SB(sb); |
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if (!sb_rdonly(sb)) { |
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/* XXX ext2 also updates the state here */ |
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mark_buffer_dirty(sbi->s_bh1); |
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if (sbi->s_bh1 != sbi->s_bh2) |
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mark_buffer_dirty(sbi->s_bh2); |
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} |
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brelse(sbi->s_bh1); |
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if (sbi->s_bh1 != sbi->s_bh2) |
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brelse(sbi->s_bh2); |
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kfree(sbi); |
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} |
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static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf) |
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{ |
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struct super_block *sb = dentry->d_sb; |
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struct sysv_sb_info *sbi = SYSV_SB(sb); |
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u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
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buf->f_type = sb->s_magic; |
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buf->f_bsize = sb->s_blocksize; |
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buf->f_blocks = sbi->s_ndatazones; |
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buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb); |
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buf->f_files = sbi->s_ninodes; |
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buf->f_ffree = sysv_count_free_inodes(sb); |
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buf->f_namelen = SYSV_NAMELEN; |
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buf->f_fsid = u64_to_fsid(id); |
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return 0; |
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} |
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/* |
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* NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32 |
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*/ |
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static inline void read3byte(struct sysv_sb_info *sbi, |
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unsigned char * from, unsigned char * to) |
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{ |
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if (sbi->s_bytesex == BYTESEX_PDP) { |
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to[0] = from[0]; |
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to[1] = 0; |
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to[2] = from[1]; |
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to[3] = from[2]; |
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} else if (sbi->s_bytesex == BYTESEX_LE) { |
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to[0] = from[0]; |
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to[1] = from[1]; |
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to[2] = from[2]; |
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to[3] = 0; |
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} else { |
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to[0] = 0; |
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to[1] = from[0]; |
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to[2] = from[1]; |
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to[3] = from[2]; |
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} |
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} |
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static inline void write3byte(struct sysv_sb_info *sbi, |
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unsigned char * from, unsigned char * to) |
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{ |
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if (sbi->s_bytesex == BYTESEX_PDP) { |
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to[0] = from[0]; |
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to[1] = from[2]; |
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to[2] = from[3]; |
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} else if (sbi->s_bytesex == BYTESEX_LE) { |
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to[0] = from[0]; |
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to[1] = from[1]; |
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to[2] = from[2]; |
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} else { |
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to[0] = from[1]; |
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to[1] = from[2]; |
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to[2] = from[3]; |
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} |
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} |
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static const struct inode_operations sysv_symlink_inode_operations = { |
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.get_link = page_get_link, |
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.getattr = sysv_getattr, |
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}; |
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void sysv_set_inode(struct inode *inode, dev_t rdev) |
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{ |
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if (S_ISREG(inode->i_mode)) { |
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inode->i_op = &sysv_file_inode_operations; |
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inode->i_fop = &sysv_file_operations; |
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inode->i_mapping->a_ops = &sysv_aops; |
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} else if (S_ISDIR(inode->i_mode)) { |
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inode->i_op = &sysv_dir_inode_operations; |
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inode->i_fop = &sysv_dir_operations; |
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inode->i_mapping->a_ops = &sysv_aops; |
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} else if (S_ISLNK(inode->i_mode)) { |
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inode->i_op = &sysv_symlink_inode_operations; |
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inode_nohighmem(inode); |
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inode->i_mapping->a_ops = &sysv_aops; |
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} else |
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init_special_inode(inode, inode->i_mode, rdev); |
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} |
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struct inode *sysv_iget(struct super_block *sb, unsigned int ino) |
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{ |
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struct sysv_sb_info * sbi = SYSV_SB(sb); |
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struct buffer_head * bh; |
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struct sysv_inode * raw_inode; |
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struct sysv_inode_info * si; |
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struct inode *inode; |
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unsigned int block; |
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if (!ino || ino > sbi->s_ninodes) { |
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printk("Bad inode number on dev %s: %d is out of range\n", |
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sb->s_id, ino); |
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return ERR_PTR(-EIO); |
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} |
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inode = iget_locked(sb, ino); |
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if (!inode) |
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return ERR_PTR(-ENOMEM); |
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if (!(inode->i_state & I_NEW)) |
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return inode; |
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raw_inode = sysv_raw_inode(sb, ino, &bh); |
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if (!raw_inode) { |
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printk("Major problem: unable to read inode from dev %s\n", |
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inode->i_sb->s_id); |
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goto bad_inode; |
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} |
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/* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */ |
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inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode); |
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i_uid_write(inode, (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid)); |
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i_gid_write(inode, (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid)); |
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set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink)); |
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inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size); |
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inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime); |
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inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime); |
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inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime); |
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inode->i_ctime.tv_nsec = 0; |
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inode->i_atime.tv_nsec = 0; |
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inode->i_mtime.tv_nsec = 0; |
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inode->i_blocks = 0; |
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si = SYSV_I(inode); |
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for (block = 0; block < 10+1+1+1; block++) |
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read3byte(sbi, &raw_inode->i_data[3*block], |
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(u8 *)&si->i_data[block]); |
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brelse(bh); |
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si->i_dir_start_lookup = 0; |
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if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) |
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sysv_set_inode(inode, |
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old_decode_dev(fs32_to_cpu(sbi, si->i_data[0]))); |
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else |
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sysv_set_inode(inode, 0); |
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unlock_new_inode(inode); |
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return inode; |
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bad_inode: |
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iget_failed(inode); |
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return ERR_PTR(-EIO); |
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} |
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static int __sysv_write_inode(struct inode *inode, int wait) |
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{ |
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struct super_block * sb = inode->i_sb; |
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struct sysv_sb_info * sbi = SYSV_SB(sb); |
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struct buffer_head * bh; |
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struct sysv_inode * raw_inode; |
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struct sysv_inode_info * si; |
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unsigned int ino, block; |
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int err = 0; |
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ino = inode->i_ino; |
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if (!ino || ino > sbi->s_ninodes) { |
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printk("Bad inode number on dev %s: %d is out of range\n", |
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inode->i_sb->s_id, ino); |
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return -EIO; |
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} |
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raw_inode = sysv_raw_inode(sb, ino, &bh); |
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if (!raw_inode) { |
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printk("unable to read i-node block\n"); |
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return -EIO; |
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} |
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raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode); |
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raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(i_uid_read(inode))); |
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raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(i_gid_read(inode))); |
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raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink); |
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raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size); |
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raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec); |
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raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec); |
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raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec); |
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si = SYSV_I(inode); |
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if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) |
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si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev)); |
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for (block = 0; block < 10+1+1+1; block++) |
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write3byte(sbi, (u8 *)&si->i_data[block], |
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&raw_inode->i_data[3*block]); |
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mark_buffer_dirty(bh); |
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if (wait) { |
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sync_dirty_buffer(bh); |
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if (buffer_req(bh) && !buffer_uptodate(bh)) { |
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printk ("IO error syncing sysv inode [%s:%08x]\n", |
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sb->s_id, ino); |
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err = -EIO; |
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} |
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} |
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brelse(bh); |
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return err; |
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} |
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int sysv_write_inode(struct inode *inode, struct writeback_control *wbc) |
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{ |
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return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
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} |
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int sysv_sync_inode(struct inode *inode) |
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{ |
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return __sysv_write_inode(inode, 1); |
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} |
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static void sysv_evict_inode(struct inode *inode) |
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{ |
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truncate_inode_pages_final(&inode->i_data); |
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if (!inode->i_nlink) { |
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inode->i_size = 0; |
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sysv_truncate(inode); |
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} |
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invalidate_inode_buffers(inode); |
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clear_inode(inode); |
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if (!inode->i_nlink) |
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sysv_free_inode(inode); |
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} |
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static struct kmem_cache *sysv_inode_cachep; |
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static struct inode *sysv_alloc_inode(struct super_block *sb) |
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{ |
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struct sysv_inode_info *si; |
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si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL); |
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if (!si) |
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return NULL; |
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return &si->vfs_inode; |
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} |
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static void sysv_free_in_core_inode(struct inode *inode) |
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{ |
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kmem_cache_free(sysv_inode_cachep, SYSV_I(inode)); |
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} |
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static void init_once(void *p) |
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{ |
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struct sysv_inode_info *si = (struct sysv_inode_info *)p; |
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inode_init_once(&si->vfs_inode); |
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} |
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const struct super_operations sysv_sops = { |
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.alloc_inode = sysv_alloc_inode, |
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.free_inode = sysv_free_in_core_inode, |
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.write_inode = sysv_write_inode, |
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.evict_inode = sysv_evict_inode, |
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.put_super = sysv_put_super, |
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.sync_fs = sysv_sync_fs, |
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.remount_fs = sysv_remount, |
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.statfs = sysv_statfs, |
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}; |
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int __init sysv_init_icache(void) |
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{ |
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sysv_inode_cachep = kmem_cache_create("sysv_inode_cache", |
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sizeof(struct sysv_inode_info), 0, |
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SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT, |
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init_once); |
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if (!sysv_inode_cachep) |
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return -ENOMEM; |
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return 0; |
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} |
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void sysv_destroy_icache(void) |
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{ |
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/* |
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* Make sure all delayed rcu free inodes are flushed before we |
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* destroy cache. |
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*/ |
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rcu_barrier(); |
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kmem_cache_destroy(sysv_inode_cachep); |
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}
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