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423 lines
11 KiB
423 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* QNX4 file system, Linux implementation. |
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* |
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* Version : 0.2.1 |
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* |
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* Using parts of the xiafs filesystem. |
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* |
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* History : |
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* |
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* 01-06-1998 by Richard Frowijn : first release. |
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* 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc. |
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* 30-06-1998 by Frank Denis : first step to write inodes. |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/highuid.h> |
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#include <linux/pagemap.h> |
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#include <linux/buffer_head.h> |
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#include <linux/writeback.h> |
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#include <linux/statfs.h> |
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#include "qnx4.h" |
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#define QNX4_VERSION 4 |
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#define QNX4_BMNAME ".bitmap" |
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static const struct super_operations qnx4_sops; |
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static struct inode *qnx4_alloc_inode(struct super_block *sb); |
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static void qnx4_free_inode(struct inode *inode); |
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static int qnx4_remount(struct super_block *sb, int *flags, char *data); |
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static int qnx4_statfs(struct dentry *, struct kstatfs *); |
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static const struct super_operations qnx4_sops = |
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{ |
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.alloc_inode = qnx4_alloc_inode, |
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.free_inode = qnx4_free_inode, |
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.statfs = qnx4_statfs, |
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.remount_fs = qnx4_remount, |
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}; |
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static int qnx4_remount(struct super_block *sb, int *flags, char *data) |
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{ |
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struct qnx4_sb_info *qs; |
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sync_filesystem(sb); |
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qs = qnx4_sb(sb); |
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qs->Version = QNX4_VERSION; |
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*flags |= SB_RDONLY; |
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return 0; |
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} |
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static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create ) |
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{ |
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unsigned long phys; |
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QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock)); |
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phys = qnx4_block_map( inode, iblock ); |
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if ( phys ) { |
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// logical block is before EOF |
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map_bh(bh, inode->i_sb, phys); |
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} |
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return 0; |
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} |
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static inline u32 try_extent(qnx4_xtnt_t *extent, u32 *offset) |
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{ |
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u32 size = le32_to_cpu(extent->xtnt_size); |
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if (*offset < size) |
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return le32_to_cpu(extent->xtnt_blk) + *offset - 1; |
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*offset -= size; |
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return 0; |
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} |
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unsigned long qnx4_block_map( struct inode *inode, long iblock ) |
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{ |
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int ix; |
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long i_xblk; |
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struct buffer_head *bh = NULL; |
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struct qnx4_xblk *xblk = NULL; |
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struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode); |
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u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts); |
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u32 offset = iblock; |
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u32 block = try_extent(&qnx4_inode->di_first_xtnt, &offset); |
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if (block) { |
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// iblock is in the first extent. This is easy. |
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} else { |
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// iblock is beyond first extent. We have to follow the extent chain. |
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i_xblk = le32_to_cpu(qnx4_inode->di_xblk); |
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ix = 0; |
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while ( --nxtnt > 0 ) { |
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if ( ix == 0 ) { |
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// read next xtnt block. |
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bh = sb_bread(inode->i_sb, i_xblk - 1); |
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if ( !bh ) { |
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QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1)); |
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return -EIO; |
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} |
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xblk = (struct qnx4_xblk*)bh->b_data; |
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if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) { |
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QNX4DEBUG((KERN_ERR "qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk)); |
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return -EIO; |
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} |
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} |
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block = try_extent(&xblk->xblk_xtnts[ix], &offset); |
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if (block) { |
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// got it! |
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break; |
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} |
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if ( ++ix >= xblk->xblk_num_xtnts ) { |
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i_xblk = le32_to_cpu(xblk->xblk_next_xblk); |
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ix = 0; |
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brelse( bh ); |
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bh = NULL; |
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} |
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} |
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if ( bh ) |
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brelse( bh ); |
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} |
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QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block)); |
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return block; |
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} |
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static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf) |
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{ |
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struct super_block *sb = dentry->d_sb; |
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u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
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buf->f_type = sb->s_magic; |
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buf->f_bsize = sb->s_blocksize; |
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buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8; |
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buf->f_bfree = qnx4_count_free_blocks(sb); |
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buf->f_bavail = buf->f_bfree; |
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buf->f_namelen = QNX4_NAME_MAX; |
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buf->f_fsid = u64_to_fsid(id); |
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return 0; |
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} |
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/* |
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* Check the root directory of the filesystem to make sure |
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* it really _is_ a qnx4 filesystem, and to check the size |
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* of the directory entry. |
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*/ |
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static const char *qnx4_checkroot(struct super_block *sb, |
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struct qnx4_super_block *s) |
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{ |
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struct buffer_head *bh; |
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struct qnx4_inode_entry *rootdir; |
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int rd, rl; |
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int i, j; |
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if (s->RootDir.di_fname[0] != '/' || s->RootDir.di_fname[1] != '\0') |
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return "no qnx4 filesystem (no root dir)."; |
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QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id)); |
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rd = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_blk) - 1; |
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rl = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_size); |
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for (j = 0; j < rl; j++) { |
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bh = sb_bread(sb, rd + j); /* root dir, first block */ |
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if (bh == NULL) |
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return "unable to read root entry."; |
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rootdir = (struct qnx4_inode_entry *) bh->b_data; |
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for (i = 0; i < QNX4_INODES_PER_BLOCK; i++, rootdir++) { |
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QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname)); |
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if (strcmp(rootdir->di_fname, QNX4_BMNAME) != 0) |
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continue; |
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qnx4_sb(sb)->BitMap = kmemdup(rootdir, |
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sizeof(struct qnx4_inode_entry), |
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GFP_KERNEL); |
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brelse(bh); |
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if (!qnx4_sb(sb)->BitMap) |
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return "not enough memory for bitmap inode"; |
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/* keep bitmap inode known */ |
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return NULL; |
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} |
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brelse(bh); |
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} |
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return "bitmap file not found."; |
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} |
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static int qnx4_fill_super(struct super_block *s, void *data, int silent) |
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{ |
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struct buffer_head *bh; |
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struct inode *root; |
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const char *errmsg; |
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struct qnx4_sb_info *qs; |
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qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL); |
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if (!qs) |
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return -ENOMEM; |
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s->s_fs_info = qs; |
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sb_set_blocksize(s, QNX4_BLOCK_SIZE); |
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s->s_op = &qnx4_sops; |
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s->s_magic = QNX4_SUPER_MAGIC; |
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s->s_flags |= SB_RDONLY; /* Yup, read-only yet */ |
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s->s_time_min = 0; |
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s->s_time_max = U32_MAX; |
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/* Check the superblock signature. Since the qnx4 code is |
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dangerous, we should leave as quickly as possible |
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if we don't belong here... */ |
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bh = sb_bread(s, 1); |
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if (!bh) { |
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printk(KERN_ERR "qnx4: unable to read the superblock\n"); |
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return -EINVAL; |
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} |
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/* check before allocating dentries, inodes, .. */ |
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errmsg = qnx4_checkroot(s, (struct qnx4_super_block *) bh->b_data); |
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brelse(bh); |
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if (errmsg != NULL) { |
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if (!silent) |
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printk(KERN_ERR "qnx4: %s\n", errmsg); |
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return -EINVAL; |
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} |
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/* does root not have inode number QNX4_ROOT_INO ?? */ |
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root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK); |
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if (IS_ERR(root)) { |
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printk(KERN_ERR "qnx4: get inode failed\n"); |
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return PTR_ERR(root); |
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} |
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s->s_root = d_make_root(root); |
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if (s->s_root == NULL) |
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return -ENOMEM; |
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return 0; |
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} |
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static void qnx4_kill_sb(struct super_block *sb) |
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{ |
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struct qnx4_sb_info *qs = qnx4_sb(sb); |
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kill_block_super(sb); |
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if (qs) { |
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kfree(qs->BitMap); |
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kfree(qs); |
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} |
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} |
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static int qnx4_readpage(struct file *file, struct page *page) |
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{ |
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return block_read_full_page(page,qnx4_get_block); |
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} |
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static sector_t qnx4_bmap(struct address_space *mapping, sector_t block) |
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{ |
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return generic_block_bmap(mapping,block,qnx4_get_block); |
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} |
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static const struct address_space_operations qnx4_aops = { |
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.readpage = qnx4_readpage, |
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.bmap = qnx4_bmap |
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}; |
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struct inode *qnx4_iget(struct super_block *sb, unsigned long ino) |
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{ |
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struct buffer_head *bh; |
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struct qnx4_inode_entry *raw_inode; |
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int block; |
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struct qnx4_inode_entry *qnx4_inode; |
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struct inode *inode; |
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inode = iget_locked(sb, ino); |
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if (!inode) |
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return ERR_PTR(-ENOMEM); |
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if (!(inode->i_state & I_NEW)) |
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return inode; |
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qnx4_inode = qnx4_raw_inode(inode); |
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inode->i_mode = 0; |
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QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino)); |
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if (!ino) { |
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printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is " |
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"out of range\n", |
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sb->s_id, ino); |
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iget_failed(inode); |
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return ERR_PTR(-EIO); |
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} |
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block = ino / QNX4_INODES_PER_BLOCK; |
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if (!(bh = sb_bread(sb, block))) { |
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printk(KERN_ERR "qnx4: major problem: unable to read inode from dev " |
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"%s\n", sb->s_id); |
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iget_failed(inode); |
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return ERR_PTR(-EIO); |
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} |
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raw_inode = ((struct qnx4_inode_entry *) bh->b_data) + |
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(ino % QNX4_INODES_PER_BLOCK); |
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inode->i_mode = le16_to_cpu(raw_inode->di_mode); |
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i_uid_write(inode, (uid_t)le16_to_cpu(raw_inode->di_uid)); |
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i_gid_write(inode, (gid_t)le16_to_cpu(raw_inode->di_gid)); |
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set_nlink(inode, le16_to_cpu(raw_inode->di_nlink)); |
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inode->i_size = le32_to_cpu(raw_inode->di_size); |
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inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime); |
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inode->i_mtime.tv_nsec = 0; |
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inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime); |
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inode->i_atime.tv_nsec = 0; |
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inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime); |
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inode->i_ctime.tv_nsec = 0; |
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inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size); |
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memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE); |
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if (S_ISREG(inode->i_mode)) { |
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inode->i_fop = &generic_ro_fops; |
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inode->i_mapping->a_ops = &qnx4_aops; |
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qnx4_i(inode)->mmu_private = inode->i_size; |
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} else if (S_ISDIR(inode->i_mode)) { |
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inode->i_op = &qnx4_dir_inode_operations; |
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inode->i_fop = &qnx4_dir_operations; |
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} else if (S_ISLNK(inode->i_mode)) { |
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inode->i_op = &page_symlink_inode_operations; |
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inode_nohighmem(inode); |
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inode->i_mapping->a_ops = &qnx4_aops; |
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qnx4_i(inode)->mmu_private = inode->i_size; |
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} else { |
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printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n", |
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ino, sb->s_id); |
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iget_failed(inode); |
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brelse(bh); |
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return ERR_PTR(-EIO); |
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} |
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brelse(bh); |
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unlock_new_inode(inode); |
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return inode; |
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} |
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static struct kmem_cache *qnx4_inode_cachep; |
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static struct inode *qnx4_alloc_inode(struct super_block *sb) |
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{ |
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struct qnx4_inode_info *ei; |
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ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL); |
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if (!ei) |
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return NULL; |
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return &ei->vfs_inode; |
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} |
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static void qnx4_free_inode(struct inode *inode) |
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{ |
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kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode)); |
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} |
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static void init_once(void *foo) |
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{ |
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struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo; |
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inode_init_once(&ei->vfs_inode); |
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} |
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static int init_inodecache(void) |
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{ |
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qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache", |
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sizeof(struct qnx4_inode_info), |
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0, (SLAB_RECLAIM_ACCOUNT| |
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SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
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init_once); |
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if (qnx4_inode_cachep == NULL) |
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return -ENOMEM; |
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return 0; |
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} |
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static void destroy_inodecache(void) |
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{ |
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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(qnx4_inode_cachep); |
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} |
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static struct dentry *qnx4_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, qnx4_fill_super); |
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} |
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static struct file_system_type qnx4_fs_type = { |
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.owner = THIS_MODULE, |
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.name = "qnx4", |
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.mount = qnx4_mount, |
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.kill_sb = qnx4_kill_sb, |
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.fs_flags = FS_REQUIRES_DEV, |
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}; |
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MODULE_ALIAS_FS("qnx4"); |
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static int __init init_qnx4_fs(void) |
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{ |
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int err; |
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err = init_inodecache(); |
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if (err) |
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return err; |
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err = register_filesystem(&qnx4_fs_type); |
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if (err) { |
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destroy_inodecache(); |
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return err; |
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} |
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printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n"); |
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return 0; |
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} |
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static void __exit exit_qnx4_fs(void) |
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{ |
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unregister_filesystem(&qnx4_fs_type); |
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destroy_inodecache(); |
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} |
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module_init(init_qnx4_fs) |
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module_exit(exit_qnx4_fs) |
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MODULE_LICENSE("GPL"); |
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