4b6f5d20b0
This is a conversion to make the various file_operations structs in fs/ const. Basically a regexp job, with a few manual fixups The goal is both to increase correctness (harder to accidentally write to shared datastructures) and reducing the false sharing of cachelines with things that get dirty in .data (while .rodata is nicely read only and thus cache clean) Signed-off-by: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.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/config.h>
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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_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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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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