342 lines
9.2 KiB
C
342 lines
9.2 KiB
C
/*
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* Copyright (c) 2000-2001 Christoph Hellwig.
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* Copyright (c) 2016 Krzysztof Blaszkowski
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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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