diff options
Diffstat (limited to 'fs/freevxfs/vxfs_inode.c')
| -rw-r--r-- | fs/freevxfs/vxfs_inode.c | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/fs/freevxfs/vxfs_inode.c b/fs/freevxfs/vxfs_inode.c new file mode 100644 index 0000000000..ac5d43b164 --- /dev/null +++ b/fs/freevxfs/vxfs_inode.c @@ -0,0 +1,316 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2000-2001 Christoph Hellwig. + * Copyright (c) 2016 Krzysztof Blaszkowski + */ + +/* + * 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_set_ctime(inode, vip->vii_ctime, 0); + inode->i_mtime.tv_sec = vip->vii_mtime; + inode->i_atime.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); +} |