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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (c) 2000-2001 Christoph Hellwig.
0004  * Copyright (c) 2016 Krzysztof Blaszkowski
0005  */
0006 
0007 /*
0008  * Veritas filesystem driver - inode routines.
0009  */
0010 #include <linux/fs.h>
0011 #include <linux/buffer_head.h>
0012 #include <linux/pagemap.h>
0013 #include <linux/kernel.h>
0014 #include <linux/slab.h>
0015 #include <linux/namei.h>
0016 
0017 #include "vxfs.h"
0018 #include "vxfs_inode.h"
0019 #include "vxfs_extern.h"
0020 
0021 
0022 #ifdef DIAGNOSTIC
0023 /*
0024  * Dump inode contents (partially).
0025  */
0026 void
0027 vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
0028 {
0029     printk(KERN_DEBUG "\n\n");
0030     if (ino)
0031         printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
0032     else
0033         printk(KERN_DEBUG "dumping unknown vxfs inode\n");
0034 
0035     printk(KERN_DEBUG "---------------------------\n");
0036     printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
0037     printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
0038             vip->vii_nlink, vip->vii_uid, vip->vii_gid);
0039     printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
0040             vip->vii_size, vip->vii_blocks);
0041     printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
0042 }
0043 #endif
0044 
0045 /**
0046  * vxfs_transmod - mode for a VxFS inode
0047  * @vip:    VxFS inode
0048  *
0049  * Description:
0050  *  vxfs_transmod returns a Linux mode_t for a given
0051  *  VxFS inode structure.
0052  */
0053 static __inline__ umode_t
0054 vxfs_transmod(struct vxfs_inode_info *vip)
0055 {
0056     umode_t         ret = vip->vii_mode & ~VXFS_TYPE_MASK;
0057 
0058     if (VXFS_ISFIFO(vip))
0059         ret |= S_IFIFO;
0060     if (VXFS_ISCHR(vip))
0061         ret |= S_IFCHR;
0062     if (VXFS_ISDIR(vip))
0063         ret |= S_IFDIR;
0064     if (VXFS_ISBLK(vip))
0065         ret |= S_IFBLK;
0066     if (VXFS_ISLNK(vip))
0067         ret |= S_IFLNK;
0068     if (VXFS_ISREG(vip))
0069         ret |= S_IFREG;
0070     if (VXFS_ISSOC(vip))
0071         ret |= S_IFSOCK;
0072 
0073     return (ret);
0074 }
0075 
0076 static inline void dip2vip_cpy(struct vxfs_sb_info *sbi,
0077         struct vxfs_inode_info *vip, struct vxfs_dinode *dip)
0078 {
0079     struct inode *inode = &vip->vfs_inode;
0080 
0081     vip->vii_mode = fs32_to_cpu(sbi, dip->vdi_mode);
0082     vip->vii_nlink = fs32_to_cpu(sbi, dip->vdi_nlink);
0083     vip->vii_uid = fs32_to_cpu(sbi, dip->vdi_uid);
0084     vip->vii_gid = fs32_to_cpu(sbi, dip->vdi_gid);
0085     vip->vii_size = fs64_to_cpu(sbi, dip->vdi_size);
0086     vip->vii_atime = fs32_to_cpu(sbi, dip->vdi_atime);
0087     vip->vii_autime = fs32_to_cpu(sbi, dip->vdi_autime);
0088     vip->vii_mtime = fs32_to_cpu(sbi, dip->vdi_mtime);
0089     vip->vii_mutime = fs32_to_cpu(sbi, dip->vdi_mutime);
0090     vip->vii_ctime = fs32_to_cpu(sbi, dip->vdi_ctime);
0091     vip->vii_cutime = fs32_to_cpu(sbi, dip->vdi_cutime);
0092     vip->vii_orgtype = dip->vdi_orgtype;
0093 
0094     vip->vii_blocks = fs32_to_cpu(sbi, dip->vdi_blocks);
0095     vip->vii_gen = fs32_to_cpu(sbi, dip->vdi_gen);
0096 
0097     if (VXFS_ISDIR(vip))
0098         vip->vii_dotdot = fs32_to_cpu(sbi, dip->vdi_dotdot);
0099     else if (!VXFS_ISREG(vip) && !VXFS_ISLNK(vip))
0100         vip->vii_rdev = fs32_to_cpu(sbi, dip->vdi_rdev);
0101 
0102     /* don't endian swap the fields that differ by orgtype */
0103     memcpy(&vip->vii_org, &dip->vdi_org, sizeof(vip->vii_org));
0104 
0105     inode->i_mode = vxfs_transmod(vip);
0106     i_uid_write(inode, (uid_t)vip->vii_uid);
0107     i_gid_write(inode, (gid_t)vip->vii_gid);
0108 
0109     set_nlink(inode, vip->vii_nlink);
0110     inode->i_size = vip->vii_size;
0111 
0112     inode->i_atime.tv_sec = vip->vii_atime;
0113     inode->i_ctime.tv_sec = vip->vii_ctime;
0114     inode->i_mtime.tv_sec = vip->vii_mtime;
0115     inode->i_atime.tv_nsec = 0;
0116     inode->i_ctime.tv_nsec = 0;
0117     inode->i_mtime.tv_nsec = 0;
0118 
0119     inode->i_blocks = vip->vii_blocks;
0120     inode->i_generation = vip->vii_gen;
0121 }
0122 
0123 /**
0124  * vxfs_blkiget - find inode based on extent #
0125  * @sbp:    superblock of the filesystem we search in
0126  * @extent: number of the extent to search
0127  * @ino:    inode number to search
0128  *
0129  * Description:
0130  *  vxfs_blkiget searches inode @ino in the filesystem described by
0131  *  @sbp in the extent @extent.
0132  *  Returns the matching VxFS inode on success, else a NULL pointer.
0133  *
0134  * NOTE:
0135  *  While __vxfs_iget uses the pagecache vxfs_blkiget uses the
0136  *  buffercache.  This function should not be used outside the
0137  *  read_super() method, otherwise the data may be incoherent.
0138  */
0139 struct inode *
0140 vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
0141 {
0142     struct buffer_head      *bp;
0143     struct inode            *inode;
0144     u_long              block, offset;
0145 
0146     inode = new_inode(sbp);
0147     if (!inode)
0148         return NULL;
0149     inode->i_ino = get_next_ino();
0150 
0151     block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
0152     offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
0153     bp = sb_bread(sbp, block);
0154 
0155     if (bp && buffer_mapped(bp)) {
0156         struct vxfs_inode_info  *vip = VXFS_INO(inode);
0157         struct vxfs_dinode  *dip;
0158 
0159         dip = (struct vxfs_dinode *)(bp->b_data + offset);
0160         dip2vip_cpy(VXFS_SBI(sbp), vip, dip);
0161         vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
0162 #ifdef DIAGNOSTIC
0163         vxfs_dumpi(vip, ino);
0164 #endif
0165         brelse(bp);
0166         return inode;
0167     }
0168 
0169     printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
0170     brelse(bp);
0171     iput(inode);
0172     return NULL;
0173 }
0174 
0175 /**
0176  * __vxfs_iget - generic find inode facility
0177  * @ilistp:     inode list
0178  * @vip:        VxFS inode to fill in
0179  * @ino:        inode number
0180  *
0181  * Description:
0182  *  Search the for inode number @ino in the filesystem
0183  *  described by @sbp.  Use the specified inode table (@ilistp).
0184  *  Returns the matching inode on success, else an error code.
0185  */
0186 static int
0187 __vxfs_iget(struct inode *ilistp, struct vxfs_inode_info *vip, ino_t ino)
0188 {
0189     struct page         *pp;
0190     u_long              offset;
0191 
0192     offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
0193     pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
0194 
0195     if (!IS_ERR(pp)) {
0196         struct vxfs_dinode  *dip;
0197         caddr_t         kaddr = (char *)page_address(pp);
0198 
0199         dip = (struct vxfs_dinode *)(kaddr + offset);
0200         dip2vip_cpy(VXFS_SBI(ilistp->i_sb), vip, dip);
0201         vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
0202 #ifdef DIAGNOSTIC
0203         vxfs_dumpi(vip, ino);
0204 #endif
0205         vxfs_put_page(pp);
0206         return 0;
0207     }
0208 
0209     printk(KERN_WARNING "vxfs: error on page 0x%p for inode %ld\n",
0210         pp, (unsigned long)ino);
0211     return PTR_ERR(pp);
0212 }
0213 
0214 /**
0215  * vxfs_stiget - find inode using the structural inode list
0216  * @sbp:    VFS superblock
0217  * @ino:    inode #
0218  *
0219  * Description:
0220  *  Find inode @ino in the filesystem described by @sbp using
0221  *  the structural inode list.
0222  *  Returns the matching inode on success, else a NULL pointer.
0223  */
0224 struct inode *
0225 vxfs_stiget(struct super_block *sbp, ino_t ino)
0226 {
0227     struct inode *inode;
0228     int error;
0229 
0230     inode = new_inode(sbp);
0231     if (!inode)
0232         return NULL;
0233     inode->i_ino = get_next_ino();
0234 
0235     error = __vxfs_iget(VXFS_SBI(sbp)->vsi_stilist, VXFS_INO(inode), ino);
0236     if (error) {
0237         iput(inode);
0238         return NULL;
0239     }
0240 
0241     return inode;
0242 }
0243 
0244 /**
0245  * vxfs_iget - get an inode
0246  * @sbp:    the superblock to get the inode for
0247  * @ino:    the number of the inode to get
0248  *
0249  * Description:
0250  *  vxfs_read_inode creates an inode, reads the disk inode for @ino and fills
0251  *  in all relevant fields in the new inode.
0252  */
0253 struct inode *
0254 vxfs_iget(struct super_block *sbp, ino_t ino)
0255 {
0256     struct vxfs_inode_info      *vip;
0257     const struct address_space_operations   *aops;
0258     struct inode *ip;
0259     int error;
0260 
0261     ip = iget_locked(sbp, ino);
0262     if (!ip)
0263         return ERR_PTR(-ENOMEM);
0264     if (!(ip->i_state & I_NEW))
0265         return ip;
0266 
0267     vip = VXFS_INO(ip);
0268     error = __vxfs_iget(VXFS_SBI(sbp)->vsi_ilist, vip, ino);
0269     if (error) {
0270         iget_failed(ip);
0271         return ERR_PTR(error);
0272     }
0273 
0274     if (VXFS_ISIMMED(vip))
0275         aops = &vxfs_immed_aops;
0276     else
0277         aops = &vxfs_aops;
0278 
0279     if (S_ISREG(ip->i_mode)) {
0280         ip->i_fop = &generic_ro_fops;
0281         ip->i_mapping->a_ops = aops;
0282     } else if (S_ISDIR(ip->i_mode)) {
0283         ip->i_op = &vxfs_dir_inode_ops;
0284         ip->i_fop = &vxfs_dir_operations;
0285         ip->i_mapping->a_ops = aops;
0286     } else if (S_ISLNK(ip->i_mode)) {
0287         if (!VXFS_ISIMMED(vip)) {
0288             ip->i_op = &page_symlink_inode_operations;
0289             inode_nohighmem(ip);
0290             ip->i_mapping->a_ops = &vxfs_aops;
0291         } else {
0292             ip->i_op = &simple_symlink_inode_operations;
0293             ip->i_link = vip->vii_immed.vi_immed;
0294             nd_terminate_link(ip->i_link, ip->i_size,
0295                       sizeof(vip->vii_immed.vi_immed) - 1);
0296         }
0297     } else
0298         init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
0299 
0300     unlock_new_inode(ip);
0301     return ip;
0302 }
0303 
0304 /**
0305  * vxfs_evict_inode - remove inode from main memory
0306  * @ip:     inode to discard.
0307  *
0308  * Description:
0309  *  vxfs_evict_inode() is called on the final iput and frees the private
0310  *  inode area.
0311  */
0312 void
0313 vxfs_evict_inode(struct inode *ip)
0314 {
0315     truncate_inode_pages_final(&ip->i_data);
0316     clear_inode(ip);
0317 }
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