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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2000-2001 Christoph Hellwig.4 * Copyright (c) 2016 Krzysztof Blaszkowski5 */6 7/*8 * Veritas filesystem driver - inode routines.9 */10#include <linux/fs.h>11#include <linux/buffer_head.h>12#include <linux/pagemap.h>13#include <linux/kernel.h>14#include <linux/slab.h>15#include <linux/namei.h>16 17#include "vxfs.h"18#include "vxfs_inode.h"19#include "vxfs_extern.h"20 21 22#ifdef DIAGNOSTIC23/*24 * Dump inode contents (partially).25 */26void27vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)28{29 printk(KERN_DEBUG "\n\n");30 if (ino)31 printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);32 else33 printk(KERN_DEBUG "dumping unknown vxfs inode\n");34 35 printk(KERN_DEBUG "---------------------------\n");36 printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);37 printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",38 vip->vii_nlink, vip->vii_uid, vip->vii_gid);39 printk(KERN_DEBUG "size:%Lx, blocks:%u\n",40 vip->vii_size, vip->vii_blocks);41 printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);42}43#endif44 45/**46 * vxfs_transmod - mode for a VxFS inode47 * @vip: VxFS inode48 *49 * Description:50 * vxfs_transmod returns a Linux mode_t for a given51 * VxFS inode structure.52 */53static __inline__ umode_t54vxfs_transmod(struct vxfs_inode_info *vip)55{56 umode_t ret = vip->vii_mode & ~VXFS_TYPE_MASK;57 58 if (VXFS_ISFIFO(vip))59 ret |= S_IFIFO;60 if (VXFS_ISCHR(vip))61 ret |= S_IFCHR;62 if (VXFS_ISDIR(vip))63 ret |= S_IFDIR;64 if (VXFS_ISBLK(vip))65 ret |= S_IFBLK;66 if (VXFS_ISLNK(vip))67 ret |= S_IFLNK;68 if (VXFS_ISREG(vip))69 ret |= S_IFREG;70 if (VXFS_ISSOC(vip))71 ret |= S_IFSOCK;72 73 return (ret);74}75 76static inline void dip2vip_cpy(struct vxfs_sb_info *sbi,77 struct vxfs_inode_info *vip, struct vxfs_dinode *dip)78{79 struct inode *inode = &vip->vfs_inode;80 81 vip->vii_mode = fs32_to_cpu(sbi, dip->vdi_mode);82 vip->vii_nlink = fs32_to_cpu(sbi, dip->vdi_nlink);83 vip->vii_uid = fs32_to_cpu(sbi, dip->vdi_uid);84 vip->vii_gid = fs32_to_cpu(sbi, dip->vdi_gid);85 vip->vii_size = fs64_to_cpu(sbi, dip->vdi_size);86 vip->vii_atime = fs32_to_cpu(sbi, dip->vdi_atime);87 vip->vii_autime = fs32_to_cpu(sbi, dip->vdi_autime);88 vip->vii_mtime = fs32_to_cpu(sbi, dip->vdi_mtime);89 vip->vii_mutime = fs32_to_cpu(sbi, dip->vdi_mutime);90 vip->vii_ctime = fs32_to_cpu(sbi, dip->vdi_ctime);91 vip->vii_cutime = fs32_to_cpu(sbi, dip->vdi_cutime);92 vip->vii_orgtype = dip->vdi_orgtype;93 94 vip->vii_blocks = fs32_to_cpu(sbi, dip->vdi_blocks);95 vip->vii_gen = fs32_to_cpu(sbi, dip->vdi_gen);96 97 if (VXFS_ISDIR(vip))98 vip->vii_dotdot = fs32_to_cpu(sbi, dip->vdi_dotdot);99 else if (!VXFS_ISREG(vip) && !VXFS_ISLNK(vip))100 vip->vii_rdev = fs32_to_cpu(sbi, dip->vdi_rdev);101 102 /* don't endian swap the fields that differ by orgtype */103 memcpy(&vip->vii_org, &dip->vdi_org, sizeof(vip->vii_org));104 105 inode->i_mode = vxfs_transmod(vip);106 i_uid_write(inode, (uid_t)vip->vii_uid);107 i_gid_write(inode, (gid_t)vip->vii_gid);108 109 set_nlink(inode, vip->vii_nlink);110 inode->i_size = vip->vii_size;111 112 inode_set_atime(inode, vip->vii_atime, 0);113 inode_set_ctime(inode, vip->vii_ctime, 0);114 inode_set_mtime(inode, vip->vii_mtime, 0);115 116 inode->i_blocks = vip->vii_blocks;117 inode->i_generation = vip->vii_gen;118}119 120/**121 * vxfs_blkiget - find inode based on extent #122 * @sbp: superblock of the filesystem we search in123 * @extent: number of the extent to search124 * @ino: inode number to search125 *126 * Description:127 * vxfs_blkiget searches inode @ino in the filesystem described by128 * @sbp in the extent @extent.129 * Returns the matching VxFS inode on success, else a NULL pointer.130 *131 * NOTE:132 * While __vxfs_iget uses the pagecache vxfs_blkiget uses the133 * buffercache. This function should not be used outside the134 * read_super() method, otherwise the data may be incoherent.135 */136struct inode *137vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)138{139 struct buffer_head *bp;140 struct inode *inode;141 u_long block, offset;142 143 inode = new_inode(sbp);144 if (!inode)145 return NULL;146 inode->i_ino = get_next_ino();147 148 block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);149 offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);150 bp = sb_bread(sbp, block);151 152 if (bp && buffer_mapped(bp)) {153 struct vxfs_inode_info *vip = VXFS_INO(inode);154 struct vxfs_dinode *dip;155 156 dip = (struct vxfs_dinode *)(bp->b_data + offset);157 dip2vip_cpy(VXFS_SBI(sbp), vip, dip);158 vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;159#ifdef DIAGNOSTIC160 vxfs_dumpi(vip, ino);161#endif162 brelse(bp);163 return inode;164 }165 166 printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);167 brelse(bp);168 iput(inode);169 return NULL;170}171 172/**173 * __vxfs_iget - generic find inode facility174 * @ilistp: inode list175 * @vip: VxFS inode to fill in176 * @ino: inode number177 *178 * Description:179 * Search the for inode number @ino in the filesystem180 * described by @sbp. Use the specified inode table (@ilistp).181 * Returns the matching inode on success, else an error code.182 */183static int184__vxfs_iget(struct inode *ilistp, struct vxfs_inode_info *vip, ino_t ino)185{186 struct page *pp;187 u_long offset;188 189 offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;190 pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);191 192 if (!IS_ERR(pp)) {193 struct vxfs_dinode *dip;194 caddr_t kaddr = (char *)page_address(pp);195 196 dip = (struct vxfs_dinode *)(kaddr + offset);197 dip2vip_cpy(VXFS_SBI(ilistp->i_sb), vip, dip);198 vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;199#ifdef DIAGNOSTIC200 vxfs_dumpi(vip, ino);201#endif202 vxfs_put_page(pp);203 return 0;204 }205 206 printk(KERN_WARNING "vxfs: error on page 0x%p for inode %ld\n",207 pp, (unsigned long)ino);208 return PTR_ERR(pp);209}210 211/**212 * vxfs_stiget - find inode using the structural inode list213 * @sbp: VFS superblock214 * @ino: inode #215 *216 * Description:217 * Find inode @ino in the filesystem described by @sbp using218 * the structural inode list.219 * Returns the matching inode on success, else a NULL pointer.220 */221struct inode *222vxfs_stiget(struct super_block *sbp, ino_t ino)223{224 struct inode *inode;225 int error;226 227 inode = new_inode(sbp);228 if (!inode)229 return NULL;230 inode->i_ino = get_next_ino();231 232 error = __vxfs_iget(VXFS_SBI(sbp)->vsi_stilist, VXFS_INO(inode), ino);233 if (error) {234 iput(inode);235 return NULL;236 }237 238 return inode;239}240 241/**242 * vxfs_iget - get an inode243 * @sbp: the superblock to get the inode for244 * @ino: the number of the inode to get245 *246 * Description:247 * vxfs_read_inode creates an inode, reads the disk inode for @ino and fills248 * in all relevant fields in the new inode.249 */250struct inode *251vxfs_iget(struct super_block *sbp, ino_t ino)252{253 struct vxfs_inode_info *vip;254 const struct address_space_operations *aops;255 struct inode *ip;256 int error;257 258 ip = iget_locked(sbp, ino);259 if (!ip)260 return ERR_PTR(-ENOMEM);261 if (!(ip->i_state & I_NEW))262 return ip;263 264 vip = VXFS_INO(ip);265 error = __vxfs_iget(VXFS_SBI(sbp)->vsi_ilist, vip, ino);266 if (error) {267 iget_failed(ip);268 return ERR_PTR(error);269 }270 271 if (VXFS_ISIMMED(vip))272 aops = &vxfs_immed_aops;273 else274 aops = &vxfs_aops;275 276 if (S_ISREG(ip->i_mode)) {277 ip->i_fop = &generic_ro_fops;278 ip->i_mapping->a_ops = aops;279 } else if (S_ISDIR(ip->i_mode)) {280 ip->i_op = &vxfs_dir_inode_ops;281 ip->i_fop = &vxfs_dir_operations;282 ip->i_mapping->a_ops = aops;283 } else if (S_ISLNK(ip->i_mode)) {284 if (!VXFS_ISIMMED(vip)) {285 ip->i_op = &page_symlink_inode_operations;286 inode_nohighmem(ip);287 ip->i_mapping->a_ops = &vxfs_aops;288 } else {289 ip->i_op = &simple_symlink_inode_operations;290 ip->i_link = vip->vii_immed.vi_immed;291 nd_terminate_link(ip->i_link, ip->i_size,292 sizeof(vip->vii_immed.vi_immed) - 1);293 }294 } else295 init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));296 297 unlock_new_inode(ip);298 return ip;299}300 301/**302 * vxfs_evict_inode - remove inode from main memory303 * @ip: inode to discard.304 *305 * Description:306 * vxfs_evict_inode() is called on the final iput and frees the private307 * inode area.308 */309void310vxfs_evict_inode(struct inode *ip)311{312 truncate_inode_pages_final(&ip->i_data);313 clear_inode(ip);314}315