/* * 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); }