2f137e31e0
This driver predates those methods and was trying to be clever allocating it's own private data. Switch to the generic scheme used by other file systems. Based on an earlier patch from Krzysztof Błaszkowski <kb@sysmikro.com.pl>. Signed-off-by: Christoph Hellwig <hch@lst.de>
341 lines
9.2 KiB
C
341 lines
9.2 KiB
C
/*
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* Copyright (c) 2000-2001 Christoph Hellwig.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL").
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Veritas filesystem driver - inode routines.
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*/
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/pagemap.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/namei.h>
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#include "vxfs.h"
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#include "vxfs_inode.h"
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#include "vxfs_extern.h"
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#ifdef DIAGNOSTIC
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/*
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* Dump inode contents (partially).
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*/
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void
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vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
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{
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printk(KERN_DEBUG "\n\n");
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if (ino)
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printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
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else
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printk(KERN_DEBUG "dumping unknown vxfs inode\n");
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printk(KERN_DEBUG "---------------------------\n");
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printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
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printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
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vip->vii_nlink, vip->vii_uid, vip->vii_gid);
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printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
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vip->vii_size, vip->vii_blocks);
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printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
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}
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#endif
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/**
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* vxfs_transmod - mode for a VxFS inode
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* @vip: VxFS inode
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*
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* Description:
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* vxfs_transmod returns a Linux mode_t for a given
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* VxFS inode structure.
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*/
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static __inline__ umode_t
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vxfs_transmod(struct vxfs_inode_info *vip)
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{
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umode_t ret = vip->vii_mode & ~VXFS_TYPE_MASK;
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if (VXFS_ISFIFO(vip))
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ret |= S_IFIFO;
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if (VXFS_ISCHR(vip))
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ret |= S_IFCHR;
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if (VXFS_ISDIR(vip))
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ret |= S_IFDIR;
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if (VXFS_ISBLK(vip))
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ret |= S_IFBLK;
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if (VXFS_ISLNK(vip))
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ret |= S_IFLNK;
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if (VXFS_ISREG(vip))
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ret |= S_IFREG;
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if (VXFS_ISSOC(vip))
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ret |= S_IFSOCK;
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return (ret);
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}
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static inline void dip2vip_cpy(struct vxfs_sb_info *sbi,
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struct vxfs_inode_info *vip, struct vxfs_dinode *dip)
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{
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struct inode *inode = &vip->vfs_inode;
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vip->vii_mode = fs32_to_cpu(sbi, dip->vdi_mode);
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vip->vii_nlink = fs32_to_cpu(sbi, dip->vdi_nlink);
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vip->vii_uid = fs32_to_cpu(sbi, dip->vdi_uid);
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vip->vii_gid = fs32_to_cpu(sbi, dip->vdi_gid);
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vip->vii_size = fs64_to_cpu(sbi, dip->vdi_size);
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vip->vii_atime = fs32_to_cpu(sbi, dip->vdi_atime);
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vip->vii_autime = fs32_to_cpu(sbi, dip->vdi_autime);
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vip->vii_mtime = fs32_to_cpu(sbi, dip->vdi_mtime);
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vip->vii_mutime = fs32_to_cpu(sbi, dip->vdi_mutime);
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vip->vii_ctime = fs32_to_cpu(sbi, dip->vdi_ctime);
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vip->vii_cutime = fs32_to_cpu(sbi, dip->vdi_cutime);
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vip->vii_orgtype = dip->vdi_orgtype;
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vip->vii_blocks = fs32_to_cpu(sbi, dip->vdi_blocks);
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vip->vii_gen = fs32_to_cpu(sbi, dip->vdi_gen);
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if (VXFS_ISDIR(vip))
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vip->vii_dotdot = fs32_to_cpu(sbi, dip->vdi_dotdot);
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else if (!VXFS_ISREG(vip) && !VXFS_ISLNK(vip))
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vip->vii_rdev = fs32_to_cpu(sbi, dip->vdi_rdev);
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/* don't endian swap the fields that differ by orgtype */
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memcpy(&vip->vii_org, &dip->vdi_org, sizeof(vip->vii_org));
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inode->i_mode = vxfs_transmod(vip);
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i_uid_write(inode, (uid_t)vip->vii_uid);
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i_gid_write(inode, (gid_t)vip->vii_gid);
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set_nlink(inode, vip->vii_nlink);
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inode->i_size = vip->vii_size;
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inode->i_atime.tv_sec = vip->vii_atime;
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inode->i_ctime.tv_sec = vip->vii_ctime;
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inode->i_mtime.tv_sec = vip->vii_mtime;
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inode->i_atime.tv_nsec = 0;
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inode->i_ctime.tv_nsec = 0;
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inode->i_mtime.tv_nsec = 0;
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inode->i_blocks = vip->vii_blocks;
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inode->i_generation = vip->vii_gen;
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}
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/**
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* vxfs_blkiget - find inode based on extent #
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* @sbp: superblock of the filesystem we search in
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* @extent: number of the extent to search
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* @ino: inode number to search
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*
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* Description:
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* vxfs_blkiget searches inode @ino in the filesystem described by
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* @sbp in the extent @extent.
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* Returns the matching VxFS inode on success, else a NULL pointer.
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*
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* NOTE:
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* While __vxfs_iget uses the pagecache vxfs_blkiget uses the
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* buffercache. This function should not be used outside the
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* read_super() method, otherwise the data may be incoherent.
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*/
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struct inode *
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vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
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{
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struct buffer_head *bp;
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struct inode *inode;
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u_long block, offset;
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inode = new_inode(sbp);
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if (!inode)
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return NULL;
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inode->i_ino = get_next_ino();
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block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
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offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
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bp = sb_bread(sbp, block);
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if (bp && buffer_mapped(bp)) {
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struct vxfs_inode_info *vip = VXFS_INO(inode);
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struct vxfs_dinode *dip;
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dip = (struct vxfs_dinode *)(bp->b_data + offset);
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dip2vip_cpy(VXFS_SBI(sbp), vip, dip);
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vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
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#ifdef DIAGNOSTIC
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vxfs_dumpi(vip, ino);
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#endif
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brelse(bp);
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return inode;
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}
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printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
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brelse(bp);
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iput(inode);
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return NULL;
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}
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/**
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* __vxfs_iget - generic find inode facility
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* @ilistp: inode list
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* @vip: VxFS inode to fill in
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* @ino: inode number
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*
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* Description:
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* Search the for inode number @ino in the filesystem
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* described by @sbp. Use the specified inode table (@ilistp).
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* Returns the matching inode on success, else an error code.
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*/
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static int
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__vxfs_iget(struct inode *ilistp, struct vxfs_inode_info *vip, ino_t ino)
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{
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struct page *pp;
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u_long offset;
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offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
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pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
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if (!IS_ERR(pp)) {
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struct vxfs_dinode *dip;
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caddr_t kaddr = (char *)page_address(pp);
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dip = (struct vxfs_dinode *)(kaddr + offset);
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dip2vip_cpy(VXFS_SBI(ilistp->i_sb), vip, dip);
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vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
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#ifdef DIAGNOSTIC
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vxfs_dumpi(vip, ino);
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#endif
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vxfs_put_page(pp);
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return 0;
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}
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printk(KERN_WARNING "vxfs: error on page 0x%p for inode %ld\n",
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pp, (unsigned long)ino);
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return PTR_ERR(pp);
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}
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/**
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* vxfs_stiget - find inode using the structural inode list
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* @sbp: VFS superblock
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* @ino: inode #
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*
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* Description:
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* Find inode @ino in the filesystem described by @sbp using
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* the structural inode list.
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* Returns the matching inode on success, else a NULL pointer.
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*/
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struct inode *
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vxfs_stiget(struct super_block *sbp, ino_t ino)
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{
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struct inode *inode;
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int error;
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inode = new_inode(sbp);
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if (!inode)
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return NULL;
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inode->i_ino = get_next_ino();
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error = __vxfs_iget(VXFS_SBI(sbp)->vsi_stilist, VXFS_INO(inode), ino);
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if (error) {
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iput(inode);
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return NULL;
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}
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return inode;
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}
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/**
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* vxfs_iget - get an inode
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* @sbp: the superblock to get the inode for
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* @ino: the number of the inode to get
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*
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* Description:
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* vxfs_read_inode creates an inode, reads the disk inode for @ino and fills
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* in all relevant fields in the new inode.
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*/
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struct inode *
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vxfs_iget(struct super_block *sbp, ino_t ino)
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{
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struct vxfs_inode_info *vip;
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const struct address_space_operations *aops;
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struct inode *ip;
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int error;
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ip = iget_locked(sbp, ino);
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if (!ip)
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return ERR_PTR(-ENOMEM);
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if (!(ip->i_state & I_NEW))
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return ip;
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vip = VXFS_INO(ip);
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error = __vxfs_iget(VXFS_SBI(sbp)->vsi_ilist, vip, ino);
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if (error) {
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iget_failed(ip);
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return ERR_PTR(error);
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}
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if (VXFS_ISIMMED(vip))
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aops = &vxfs_immed_aops;
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else
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aops = &vxfs_aops;
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if (S_ISREG(ip->i_mode)) {
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ip->i_fop = &generic_ro_fops;
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ip->i_mapping->a_ops = aops;
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} else if (S_ISDIR(ip->i_mode)) {
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ip->i_op = &vxfs_dir_inode_ops;
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ip->i_fop = &vxfs_dir_operations;
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ip->i_mapping->a_ops = aops;
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} else if (S_ISLNK(ip->i_mode)) {
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if (!VXFS_ISIMMED(vip)) {
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ip->i_op = &page_symlink_inode_operations;
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inode_nohighmem(ip);
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ip->i_mapping->a_ops = &vxfs_aops;
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} else {
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ip->i_op = &simple_symlink_inode_operations;
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ip->i_link = vip->vii_immed.vi_immed;
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nd_terminate_link(ip->i_link, ip->i_size,
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sizeof(vip->vii_immed.vi_immed) - 1);
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}
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} else
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init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
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unlock_new_inode(ip);
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return ip;
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}
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/**
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* vxfs_evict_inode - remove inode from main memory
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* @ip: inode to discard.
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*
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* Description:
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* vxfs_evict_inode() is called on the final iput and frees the private
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* inode area.
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*/
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void
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vxfs_evict_inode(struct inode *ip)
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{
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truncate_inode_pages_final(&ip->i_data);
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clear_inode(ip);
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}
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