/* * Copyright (c) 2000-2001 Christoph Hellwig. * 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 "vxfs.h" #include "vxfs_inode.h" #include "vxfs_extern.h" struct kmem_cache *vxfs_inode_cachep; #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_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 vxfs_inode_info * vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino) { struct buffer_head *bp; u_long block, offset; 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; struct vxfs_dinode *dip; if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL))) goto fail; dip = (struct vxfs_dinode *)(bp->b_data + offset); memcpy(vip, dip, sizeof(*vip)); #ifdef DIAGNOSTIC vxfs_dumpi(vip, ino); #endif brelse(bp); return (vip); } fail: printk(KERN_WARNING "vxfs: unable to read block %ld\n", block); brelse(bp); return NULL; } /** * __vxfs_iget - generic find inode facility * @sbp: VFS superblock * @ino: inode number * @ilistp: inode list * * Description: * Search the for inode number @ino in the filesystem * described by @sbp. Use the specified inode table (@ilistp). * Returns the matching VxFS inode on success, else an error code. */ static struct vxfs_inode_info * __vxfs_iget(ino_t ino, struct inode *ilistp) { 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_inode_info *vip; struct vxfs_dinode *dip; caddr_t kaddr = (char *)page_address(pp); if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL))) goto fail; dip = (struct vxfs_dinode *)(kaddr + offset); memcpy(vip, dip, sizeof(*vip)); #ifdef DIAGNOSTIC vxfs_dumpi(vip, ino); #endif vxfs_put_page(pp); return (vip); } printk(KERN_WARNING "vxfs: error on page %p\n", pp); return ERR_CAST(pp); fail: printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino); vxfs_put_page(pp); return ERR_PTR(-ENOMEM); } /** * 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 VxFS inode on success, else a NULL pointer. */ struct vxfs_inode_info * vxfs_stiget(struct super_block *sbp, ino_t ino) { struct vxfs_inode_info *vip; vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist); return IS_ERR(vip) ? NULL : vip; } /** * 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); } /** * vxfs_iinit- helper to fill inode fields * @ip: VFS inode * @vip: VxFS inode * * Description: * vxfs_instino is a helper function to fill in all relevant * fields in @ip from @vip. */ static void vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip) { ip->i_mode = vxfs_transmod(vip); i_uid_write(ip, (uid_t)vip->vii_uid); i_gid_write(ip, (gid_t)vip->vii_gid); set_nlink(ip, vip->vii_nlink); ip->i_size = vip->vii_size; ip->i_atime.tv_sec = vip->vii_atime; ip->i_ctime.tv_sec = vip->vii_ctime; ip->i_mtime.tv_sec = vip->vii_mtime; ip->i_atime.tv_nsec = 0; ip->i_ctime.tv_nsec = 0; ip->i_mtime.tv_nsec = 0; ip->i_blocks = vip->vii_blocks; ip->i_generation = vip->vii_gen; ip->i_private = vip; } /** * vxfs_get_fake_inode - get fake inode structure * @sbp: filesystem superblock * @vip: fspriv inode * * Description: * vxfs_fake_inode gets a fake inode (not in the inode hash) for a * superblock, vxfs_inode pair. * Returns the filled VFS inode. */ struct inode * vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip) { struct inode *ip = NULL; if ((ip = new_inode(sbp))) { ip->i_ino = get_next_ino(); vxfs_iinit(ip, vip); ip->i_mapping->a_ops = &vxfs_aops; } return (ip); } /** * vxfs_put_fake_inode - free faked inode * *ip: VFS inode * * Description: * vxfs_put_fake_inode frees all data associated with @ip. */ void vxfs_put_fake_inode(struct inode *ip) { iput(ip); } /** * 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; ip = iget_locked(sbp, ino); if (!ip) return ERR_PTR(-ENOMEM); if (!(ip->i_state & I_NEW)) return ip; vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist); if (IS_ERR(vip)) { iget_failed(ip); return ERR_CAST(vip); } vxfs_iinit(ip, vip); 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; ip->i_mapping->a_ops = &vxfs_aops; } else { ip->i_op = &vxfs_immed_symlink_iops; vip->vii_immed.vi_immed[ip->i_size] = '\0'; } } else init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev)); unlock_new_inode(ip); return ip; } static void vxfs_i_callback(struct rcu_head *head) { struct inode *inode = container_of(head, struct inode, i_rcu); kmem_cache_free(vxfs_inode_cachep, inode->i_private); } /** * 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(&ip->i_data, 0); clear_inode(ip); call_rcu(&ip->i_rcu, vxfs_i_callback); }