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c5ef1c42c5
Many struct inode_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
/*
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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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* 28-05-1998 by Richard Frowijn : first release.
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* 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support.
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*/
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/qnx4_fs.h>
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#include <linux/stat.h>
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#include <linux/smp_lock.h>
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#include <linux/buffer_head.h>
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static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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struct inode *inode = filp->f_path.dentry->d_inode;
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unsigned int offset;
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struct buffer_head *bh;
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struct qnx4_inode_entry *de;
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struct qnx4_link_info *le;
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unsigned long blknum;
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int ix, ino;
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int size;
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QNX4DEBUG(("qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
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QNX4DEBUG(("filp->f_pos = %ld\n", (long) filp->f_pos));
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lock_kernel();
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while (filp->f_pos < inode->i_size) {
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blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS );
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bh = sb_bread(inode->i_sb, blknum);
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if(bh==NULL) {
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printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
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break;
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}
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ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
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while (ix < QNX4_INODES_PER_BLOCK) {
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offset = ix * QNX4_DIR_ENTRY_SIZE;
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de = (struct qnx4_inode_entry *) (bh->b_data + offset);
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size = strlen(de->di_fname);
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if (size) {
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if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX )
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size = QNX4_SHORT_NAME_MAX;
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else if ( size > QNX4_NAME_MAX )
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size = QNX4_NAME_MAX;
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if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) {
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QNX4DEBUG(("qnx4_readdir:%.*s\n", size, de->di_fname));
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if ( ( de->di_status & QNX4_FILE_LINK ) == 0 )
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ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
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else {
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le = (struct qnx4_link_info*)de;
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ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *
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QNX4_INODES_PER_BLOCK +
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le->dl_inode_ndx;
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}
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if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) {
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brelse(bh);
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goto out;
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}
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}
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}
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ix++;
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filp->f_pos += QNX4_DIR_ENTRY_SIZE;
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}
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brelse(bh);
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}
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out:
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unlock_kernel();
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return 0;
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}
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const struct file_operations qnx4_dir_operations =
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{
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.read = generic_read_dir,
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.readdir = qnx4_readdir,
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.fsync = file_fsync,
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};
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const struct inode_operations qnx4_dir_inode_operations =
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{
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.lookup = qnx4_lookup,
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#ifdef CONFIG_QNX4FS_RW
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.create = qnx4_create,
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.unlink = qnx4_unlink,
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.rmdir = qnx4_rmdir,
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#endif
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};
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