50953fe9e0
I have never seen a use of SLAB_DEBUG_INITIAL. It is only supported by SLAB. I think its purpose was to have a callback after an object has been freed to verify that the state is the constructor state again? The callback is performed before each freeing of an object. I would think that it is much easier to check the object state manually before the free. That also places the check near the code object manipulation of the object. Also the SLAB_DEBUG_INITIAL callback is only performed if the kernel was compiled with SLAB debugging on. If there would be code in a constructor handling SLAB_DEBUG_INITIAL then it would have to be conditional on SLAB_DEBUG otherwise it would just be dead code. But there is no such code in the kernel. I think SLUB_DEBUG_INITIAL is too problematic to make real use of, difficult to understand and there are easier ways to accomplish the same effect (i.e. add debug code before kfree). There is a related flag SLAB_CTOR_VERIFY that is frequently checked to be clear in fs inode caches. Remove the pointless checks (they would even be pointless without removeal of SLAB_DEBUG_INITIAL) from the fs constructors. This is the last slab flag that SLUB did not support. Remove the check for unimplemented flags from SLUB. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
356 lines
9.2 KiB
C
356 lines
9.2 KiB
C
/*
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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/smp_lock.h>
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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 <asm/byteorder.h>
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#include "sysv.h"
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/* This is only called on sync() and umount(), when s_dirt=1. */
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static void sysv_write_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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unsigned long time = get_seconds(), old_time;
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lock_kernel();
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if (sb->s_flags & MS_RDONLY)
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goto clean;
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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, 0x7c269d38 - old_time))
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*sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - 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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clean:
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sb->s_dirt = 0;
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unlock_kernel();
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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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if (sbi->s_forced_ro)
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*flags |= MS_RDONLY;
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if (!(*flags & MS_RDONLY))
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sb->s_dirt = 1;
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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->s_flags & MS_RDONLY)) {
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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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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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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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.readlink = generic_readlink,
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.follow_link = page_follow_link_light,
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.put_link = page_put_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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if (inode->i_blocks) {
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inode->i_op = &sysv_symlink_inode_operations;
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inode->i_mapping->a_ops = &sysv_aops;
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} else
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inode->i_op = &sysv_fast_symlink_inode_operations;
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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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static void sysv_read_inode(struct inode *inode)
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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 block, 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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goto bad_inode;
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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("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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inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
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inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
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inode->i_nlink = 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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return;
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bad_inode:
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make_bad_inode(inode);
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return;
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}
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static struct buffer_head * sysv_update_inode(struct inode * inode)
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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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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 NULL;
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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 NULL;
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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(inode->i_uid));
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raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
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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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return bh;
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}
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int sysv_write_inode(struct inode * inode, int wait)
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{
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struct buffer_head *bh;
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lock_kernel();
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bh = sysv_update_inode(inode);
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brelse(bh);
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unlock_kernel();
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return 0;
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}
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int sysv_sync_inode(struct inode * inode)
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{
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int err = 0;
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struct buffer_head *bh;
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bh = sysv_update_inode(inode);
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if (bh && buffer_dirty(bh)) {
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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:%08lx]\n",
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inode->i_sb->s_id, inode->i_ino);
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err = -1;
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}
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}
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else if (!bh)
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err = -1;
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brelse (bh);
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return err;
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}
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static void sysv_delete_inode(struct inode *inode)
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{
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truncate_inode_pages(&inode->i_data, 0);
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inode->i_size = 0;
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sysv_truncate(inode);
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lock_kernel();
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sysv_free_inode(inode);
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unlock_kernel();
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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_destroy_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, struct kmem_cache *cachep, unsigned long flags)
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{
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struct sysv_inode_info *si = (struct sysv_inode_info *)p;
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if (flags & SLAB_CTOR_CONSTRUCTOR)
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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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.destroy_inode = sysv_destroy_inode,
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.read_inode = sysv_read_inode,
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.write_inode = sysv_write_inode,
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.delete_inode = sysv_delete_inode,
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.put_super = sysv_put_super,
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.write_super = sysv_write_super,
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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,
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init_once, NULL);
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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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kmem_cache_destroy(sysv_inode_cachep);
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}
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