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358 lines
8.7 KiB
358 lines
8.7 KiB
/* |
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* Copyright (c) 2000-2001 Christoph Hellwig. |
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* Copyright (c) 2016 Krzysztof Blaszkowski |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions, and the following disclaimer, |
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* without modification. |
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* 2. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* Alternatively, this software may be distributed under the terms of the |
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* GNU General Public License ("GPL"). |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR |
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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/* |
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* Veritas filesystem driver - superblock related routines. |
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*/ |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/blkdev.h> |
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#include <linux/fs.h> |
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#include <linux/buffer_head.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/stat.h> |
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#include <linux/vfs.h> |
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#include <linux/mount.h> |
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#include "vxfs.h" |
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#include "vxfs_extern.h" |
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#include "vxfs_dir.h" |
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#include "vxfs_inode.h" |
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MODULE_AUTHOR("Christoph Hellwig, Krzysztof Blaszkowski"); |
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MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver"); |
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MODULE_LICENSE("Dual BSD/GPL"); |
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static struct kmem_cache *vxfs_inode_cachep; |
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/** |
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* vxfs_put_super - free superblock resources |
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* @sbp: VFS superblock. |
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* |
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* Description: |
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* vxfs_put_super frees all resources allocated for @sbp |
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* after the last instance of the filesystem is unmounted. |
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*/ |
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static void |
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vxfs_put_super(struct super_block *sbp) |
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{ |
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struct vxfs_sb_info *infp = VXFS_SBI(sbp); |
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iput(infp->vsi_fship); |
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iput(infp->vsi_ilist); |
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iput(infp->vsi_stilist); |
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brelse(infp->vsi_bp); |
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kfree(infp); |
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} |
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/** |
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* vxfs_statfs - get filesystem information |
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* @dentry: VFS dentry to locate superblock |
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* @bufp: output buffer |
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* |
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* Description: |
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* vxfs_statfs fills the statfs buffer @bufp with information |
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* about the filesystem described by @dentry. |
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* |
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* Returns: |
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* Zero. |
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* |
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* Locking: |
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* No locks held. |
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* |
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* Notes: |
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* This is everything but complete... |
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*/ |
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static int |
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vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp) |
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{ |
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struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb); |
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struct vxfs_sb *raw_sb = infp->vsi_raw; |
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bufp->f_type = VXFS_SUPER_MAGIC; |
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bufp->f_bsize = dentry->d_sb->s_blocksize; |
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bufp->f_blocks = fs32_to_cpu(infp, raw_sb->vs_dsize); |
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bufp->f_bfree = fs32_to_cpu(infp, raw_sb->vs_free); |
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bufp->f_bavail = 0; |
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bufp->f_files = 0; |
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bufp->f_ffree = fs32_to_cpu(infp, raw_sb->vs_ifree); |
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bufp->f_namelen = VXFS_NAMELEN; |
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return 0; |
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} |
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static int vxfs_remount(struct super_block *sb, int *flags, char *data) |
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{ |
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sync_filesystem(sb); |
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*flags |= SB_RDONLY; |
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return 0; |
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} |
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static struct inode *vxfs_alloc_inode(struct super_block *sb) |
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{ |
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struct vxfs_inode_info *vi; |
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vi = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL); |
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if (!vi) |
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return NULL; |
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inode_init_once(&vi->vfs_inode); |
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return &vi->vfs_inode; |
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} |
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static void vxfs_free_inode(struct inode *inode) |
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{ |
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kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode)); |
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} |
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static const struct super_operations vxfs_super_ops = { |
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.alloc_inode = vxfs_alloc_inode, |
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.free_inode = vxfs_free_inode, |
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.evict_inode = vxfs_evict_inode, |
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.put_super = vxfs_put_super, |
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.statfs = vxfs_statfs, |
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.remount_fs = vxfs_remount, |
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}; |
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static int vxfs_try_sb_magic(struct super_block *sbp, int silent, |
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unsigned blk, __fs32 magic) |
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{ |
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struct buffer_head *bp; |
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struct vxfs_sb *rsbp; |
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struct vxfs_sb_info *infp = VXFS_SBI(sbp); |
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int rc = -ENOMEM; |
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bp = sb_bread(sbp, blk); |
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do { |
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if (!bp || !buffer_mapped(bp)) { |
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if (!silent) { |
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printk(KERN_WARNING |
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"vxfs: unable to read disk superblock at %u\n", |
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blk); |
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} |
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break; |
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} |
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rc = -EINVAL; |
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rsbp = (struct vxfs_sb *)bp->b_data; |
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if (rsbp->vs_magic != magic) { |
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if (!silent) |
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printk(KERN_NOTICE |
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"vxfs: WRONG superblock magic %08x at %u\n", |
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rsbp->vs_magic, blk); |
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break; |
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} |
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rc = 0; |
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infp->vsi_raw = rsbp; |
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infp->vsi_bp = bp; |
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} while (0); |
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if (rc) { |
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infp->vsi_raw = NULL; |
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infp->vsi_bp = NULL; |
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brelse(bp); |
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} |
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return rc; |
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} |
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/** |
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* vxfs_read_super - read superblock into memory and initialize filesystem |
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* @sbp: VFS superblock (to fill) |
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* @dp: fs private mount data |
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* @silent: do not complain loudly when sth is wrong |
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* |
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* Description: |
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* We are called on the first mount of a filesystem to read the |
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* superblock into memory and do some basic setup. |
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* |
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* Returns: |
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* The superblock on success, else %NULL. |
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* |
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* Locking: |
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* We are under @sbp->s_lock. |
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*/ |
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static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent) |
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{ |
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struct vxfs_sb_info *infp; |
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struct vxfs_sb *rsbp; |
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u_long bsize; |
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struct inode *root; |
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int ret = -EINVAL; |
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u32 j; |
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sbp->s_flags |= SB_RDONLY; |
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infp = kzalloc(sizeof(*infp), GFP_KERNEL); |
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if (!infp) { |
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printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n"); |
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return -ENOMEM; |
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} |
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bsize = sb_min_blocksize(sbp, BLOCK_SIZE); |
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if (!bsize) { |
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printk(KERN_WARNING "vxfs: unable to set blocksize\n"); |
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goto out; |
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} |
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sbp->s_op = &vxfs_super_ops; |
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sbp->s_fs_info = infp; |
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sbp->s_time_min = 0; |
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sbp->s_time_max = U32_MAX; |
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if (!vxfs_try_sb_magic(sbp, silent, 1, |
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(__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) { |
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/* Unixware, x86 */ |
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infp->byte_order = VXFS_BO_LE; |
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} else if (!vxfs_try_sb_magic(sbp, silent, 8, |
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(__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) { |
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/* HP-UX, parisc */ |
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infp->byte_order = VXFS_BO_BE; |
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} else { |
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if (!silent) |
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printk(KERN_NOTICE "vxfs: can't find superblock.\n"); |
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goto out; |
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} |
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rsbp = infp->vsi_raw; |
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j = fs32_to_cpu(infp, rsbp->vs_version); |
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if ((j < 2 || j > 4) && !silent) { |
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printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j); |
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goto out; |
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} |
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#ifdef DIAGNOSTIC |
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printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j); |
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printk(KERN_DEBUG "vxfs: blocksize: %d\n", |
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fs32_to_cpu(infp, rsbp->vs_bsize)); |
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#endif |
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sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic); |
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infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]); |
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infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize); |
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j = fs32_to_cpu(infp, rsbp->vs_bsize); |
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if (!sb_set_blocksize(sbp, j)) { |
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printk(KERN_WARNING "vxfs: unable to set final block size\n"); |
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goto out; |
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} |
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if (vxfs_read_olt(sbp, bsize)) { |
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printk(KERN_WARNING "vxfs: unable to read olt\n"); |
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goto out; |
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} |
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if (vxfs_read_fshead(sbp)) { |
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printk(KERN_WARNING "vxfs: unable to read fshead\n"); |
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goto out; |
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} |
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root = vxfs_iget(sbp, VXFS_ROOT_INO); |
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if (IS_ERR(root)) { |
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ret = PTR_ERR(root); |
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goto out; |
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} |
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sbp->s_root = d_make_root(root); |
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if (!sbp->s_root) { |
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printk(KERN_WARNING "vxfs: unable to get root dentry.\n"); |
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goto out_free_ilist; |
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} |
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return 0; |
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out_free_ilist: |
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iput(infp->vsi_fship); |
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iput(infp->vsi_ilist); |
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iput(infp->vsi_stilist); |
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out: |
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brelse(infp->vsi_bp); |
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kfree(infp); |
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return ret; |
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} |
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/* |
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* The usual module blurb. |
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*/ |
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static struct dentry *vxfs_mount(struct file_system_type *fs_type, |
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int flags, const char *dev_name, void *data) |
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{ |
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return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super); |
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} |
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static struct file_system_type vxfs_fs_type = { |
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.owner = THIS_MODULE, |
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.name = "vxfs", |
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.mount = vxfs_mount, |
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.kill_sb = kill_block_super, |
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.fs_flags = FS_REQUIRES_DEV, |
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}; |
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MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */ |
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MODULE_ALIAS("vxfs"); |
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static int __init |
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vxfs_init(void) |
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{ |
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int rv; |
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vxfs_inode_cachep = kmem_cache_create_usercopy("vxfs_inode", |
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sizeof(struct vxfs_inode_info), 0, |
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SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
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offsetof(struct vxfs_inode_info, vii_immed.vi_immed), |
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sizeof_field(struct vxfs_inode_info, |
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vii_immed.vi_immed), |
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NULL); |
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if (!vxfs_inode_cachep) |
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return -ENOMEM; |
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rv = register_filesystem(&vxfs_fs_type); |
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if (rv < 0) |
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kmem_cache_destroy(vxfs_inode_cachep); |
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return rv; |
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} |
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static void __exit |
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vxfs_cleanup(void) |
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{ |
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unregister_filesystem(&vxfs_fs_type); |
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/* |
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* Make sure all delayed rcu free inodes are flushed before we |
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* destroy cache. |
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*/ |
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rcu_barrier(); |
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kmem_cache_destroy(vxfs_inode_cachep); |
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} |
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module_init(vxfs_init); |
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module_exit(vxfs_cleanup);
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