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linux/fs/freevxfs/vxfs_inode.c

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/*
* Copyright (c) 2000-2001 Christoph Hellwig.
* Copyright (c) 2016 Krzysztof Blaszkowski
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL").
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Veritas filesystem driver - inode routines.
*/
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/pagemap.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include "vxfs.h"
#include "vxfs_inode.h"
#include "vxfs_extern.h"
#ifdef DIAGNOSTIC
/*
* Dump inode contents (partially).
*/
void
vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
{
printk(KERN_DEBUG "\n\n");
if (ino)
printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
else
printk(KERN_DEBUG "dumping unknown vxfs inode\n");
printk(KERN_DEBUG "---------------------------\n");
printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
vip->vii_nlink, vip->vii_uid, vip->vii_gid);
printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
vip->vii_size, vip->vii_blocks);
printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
}
#endif
/**
* vxfs_transmod - mode for a VxFS inode
* @vip: VxFS inode
*
* Description:
* vxfs_transmod returns a Linux mode_t for a given
* VxFS inode structure.
*/
static __inline__ umode_t
vxfs_transmod(struct vxfs_inode_info *vip)
{
umode_t ret = vip->vii_mode & ~VXFS_TYPE_MASK;
if (VXFS_ISFIFO(vip))
ret |= S_IFIFO;
if (VXFS_ISCHR(vip))
ret |= S_IFCHR;
if (VXFS_ISDIR(vip))
ret |= S_IFDIR;
if (VXFS_ISBLK(vip))
ret |= S_IFBLK;
if (VXFS_ISLNK(vip))
ret |= S_IFLNK;
if (VXFS_ISREG(vip))
ret |= S_IFREG;
if (VXFS_ISSOC(vip))
ret |= S_IFSOCK;
return (ret);
}
static inline void dip2vip_cpy(struct vxfs_sb_info *sbi,
struct vxfs_inode_info *vip, struct vxfs_dinode *dip)
{
struct inode *inode = &vip->vfs_inode;
vip->vii_mode = fs32_to_cpu(sbi, dip->vdi_mode);
vip->vii_nlink = fs32_to_cpu(sbi, dip->vdi_nlink);
vip->vii_uid = fs32_to_cpu(sbi, dip->vdi_uid);
vip->vii_gid = fs32_to_cpu(sbi, dip->vdi_gid);
vip->vii_size = fs64_to_cpu(sbi, dip->vdi_size);
vip->vii_atime = fs32_to_cpu(sbi, dip->vdi_atime);
vip->vii_autime = fs32_to_cpu(sbi, dip->vdi_autime);
vip->vii_mtime = fs32_to_cpu(sbi, dip->vdi_mtime);
vip->vii_mutime = fs32_to_cpu(sbi, dip->vdi_mutime);
vip->vii_ctime = fs32_to_cpu(sbi, dip->vdi_ctime);
vip->vii_cutime = fs32_to_cpu(sbi, dip->vdi_cutime);
vip->vii_orgtype = dip->vdi_orgtype;
vip->vii_blocks = fs32_to_cpu(sbi, dip->vdi_blocks);
vip->vii_gen = fs32_to_cpu(sbi, dip->vdi_gen);
if (VXFS_ISDIR(vip))
vip->vii_dotdot = fs32_to_cpu(sbi, dip->vdi_dotdot);
else if (!VXFS_ISREG(vip) && !VXFS_ISLNK(vip))
vip->vii_rdev = fs32_to_cpu(sbi, dip->vdi_rdev);
/* don't endian swap the fields that differ by orgtype */
memcpy(&vip->vii_org, &dip->vdi_org, sizeof(vip->vii_org));
inode->i_mode = vxfs_transmod(vip);
i_uid_write(inode, (uid_t)vip->vii_uid);
i_gid_write(inode, (gid_t)vip->vii_gid);
set_nlink(inode, vip->vii_nlink);
inode->i_size = vip->vii_size;
inode->i_atime.tv_sec = vip->vii_atime;
inode->i_ctime.tv_sec = vip->vii_ctime;
inode->i_mtime.tv_sec = vip->vii_mtime;
inode->i_atime.tv_nsec = 0;
inode->i_ctime.tv_nsec = 0;
inode->i_mtime.tv_nsec = 0;
inode->i_blocks = vip->vii_blocks;
inode->i_generation = vip->vii_gen;
}
/**
* vxfs_blkiget - find inode based on extent #
* @sbp: superblock of the filesystem we search in
* @extent: number of the extent to search
* @ino: inode number to search
*
* Description:
* vxfs_blkiget searches inode @ino in the filesystem described by
* @sbp in the extent @extent.
* Returns the matching VxFS inode on success, else a NULL pointer.
*
* NOTE:
* While __vxfs_iget uses the pagecache vxfs_blkiget uses the
* buffercache. This function should not be used outside the
* read_super() method, otherwise the data may be incoherent.
*/
struct inode *
vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
{
struct buffer_head *bp;
struct inode *inode;
u_long block, offset;
inode = new_inode(sbp);
if (!inode)
return NULL;
inode->i_ino = get_next_ino();
block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
bp = sb_bread(sbp, block);
if (bp && buffer_mapped(bp)) {
struct vxfs_inode_info *vip = VXFS_INO(inode);
struct vxfs_dinode *dip;
dip = (struct vxfs_dinode *)(bp->b_data + offset);
dip2vip_cpy(VXFS_SBI(sbp), vip, dip);
vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
#ifdef DIAGNOSTIC
vxfs_dumpi(vip, ino);
#endif
brelse(bp);
return inode;
}
printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
brelse(bp);
iput(inode);
return NULL;
}
/**
* __vxfs_iget - generic find inode facility
* @ilistp: inode list
* @vip: VxFS inode to fill in
* @ino: inode number
*
* Description:
* Search the for inode number @ino in the filesystem
* described by @sbp. Use the specified inode table (@ilistp).
* Returns the matching inode on success, else an error code.
*/
static int
__vxfs_iget(struct inode *ilistp, struct vxfs_inode_info *vip, ino_t ino)
{
struct page *pp;
u_long offset;
offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
if (!IS_ERR(pp)) {
struct vxfs_dinode *dip;
caddr_t kaddr = (char *)page_address(pp);
dip = (struct vxfs_dinode *)(kaddr + offset);
dip2vip_cpy(VXFS_SBI(ilistp->i_sb), vip, dip);
vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
#ifdef DIAGNOSTIC
vxfs_dumpi(vip, ino);
#endif
vxfs_put_page(pp);
return 0;
}
printk(KERN_WARNING "vxfs: error on page 0x%p for inode %ld\n",
pp, (unsigned long)ino);
return PTR_ERR(pp);
}
/**
* vxfs_stiget - find inode using the structural inode list
* @sbp: VFS superblock
* @ino: inode #
*
* Description:
* Find inode @ino in the filesystem described by @sbp using
* the structural inode list.
* Returns the matching inode on success, else a NULL pointer.
*/
struct inode *
vxfs_stiget(struct super_block *sbp, ino_t ino)
{
struct inode *inode;
int error;
inode = new_inode(sbp);
if (!inode)
return NULL;
inode->i_ino = get_next_ino();
error = __vxfs_iget(VXFS_SBI(sbp)->vsi_stilist, VXFS_INO(inode), ino);
if (error) {
iput(inode);
return NULL;
}
return inode;
}
/**
* vxfs_iget - get an inode
* @sbp: the superblock to get the inode for
* @ino: the number of the inode to get
*
* Description:
* vxfs_read_inode creates an inode, reads the disk inode for @ino and fills
* in all relevant fields in the new inode.
*/
struct inode *
vxfs_iget(struct super_block *sbp, ino_t ino)
{
struct vxfs_inode_info *vip;
const struct address_space_operations *aops;
struct inode *ip;
int error;
ip = iget_locked(sbp, ino);
if (!ip)
return ERR_PTR(-ENOMEM);
if (!(ip->i_state & I_NEW))
return ip;
vip = VXFS_INO(ip);
error = __vxfs_iget(VXFS_SBI(sbp)->vsi_ilist, vip, ino);
if (error) {
iget_failed(ip);
return ERR_PTR(error);
}
if (VXFS_ISIMMED(vip))
aops = &vxfs_immed_aops;
else
aops = &vxfs_aops;
if (S_ISREG(ip->i_mode)) {
ip->i_fop = &generic_ro_fops;
ip->i_mapping->a_ops = aops;
} else if (S_ISDIR(ip->i_mode)) {
ip->i_op = &vxfs_dir_inode_ops;
ip->i_fop = &vxfs_dir_operations;
ip->i_mapping->a_ops = aops;
} else if (S_ISLNK(ip->i_mode)) {
if (!VXFS_ISIMMED(vip)) {
ip->i_op = &page_symlink_inode_operations;
inode_nohighmem(ip);
ip->i_mapping->a_ops = &vxfs_aops;
} else {
ip->i_op = &simple_symlink_inode_operations;
ip->i_link = vip->vii_immed.vi_immed;
nd_terminate_link(ip->i_link, ip->i_size,
sizeof(vip->vii_immed.vi_immed) - 1);
}
} else
init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
unlock_new_inode(ip);
return ip;
}
/**
* vxfs_evict_inode - remove inode from main memory
* @ip: inode to discard.
*
* Description:
* vxfs_evict_inode() is called on the final iput and frees the private
* inode area.
*/
void
vxfs_evict_inode(struct inode *ip)
{
truncate_inode_pages_final(&ip->i_data);
clear_inode(ip);
}
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