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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [sysv/] [dir.c] - Blame information for rev 1782

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Line No. Rev Author Line
1 1628 jcastillo
/*
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 *  linux/fs/sysv/dir.c
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 *
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 *  minix/dir.c
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 *  Copyright (C) 1991, 1992  Linus Torvalds
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 *
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 *  coh/dir.c
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 *  Copyright (C) 1993  Pascal Haible, Bruno Haible
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 *
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 *  sysv/dir.c
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 *  Copyright (C) 1993  Bruno Haible
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 *
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 *  SystemV/Coherent directory handling functions
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 */
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/sysv_fs.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <asm/segment.h>
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static int sysv_dir_read(struct inode * inode, struct file * filp, char * buf, int count)
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{
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        return -EISDIR;
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}
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static int sysv_readdir(struct inode *, struct file *, void *, filldir_t);
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static struct file_operations sysv_dir_operations = {
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        NULL,                   /* lseek - default */
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        sysv_dir_read,          /* read */
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        NULL,                   /* write - bad */
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        sysv_readdir,           /* readdir */
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        NULL,                   /* select - default */
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        NULL,                   /* ioctl - default */
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        NULL,                   /* mmap */
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        NULL,                   /* no special open code */
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        NULL,                   /* no special release code */
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        file_fsync              /* default fsync */
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};
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/*
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 * directories can handle most operations...
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 */
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struct inode_operations sysv_dir_inode_operations = {
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        &sysv_dir_operations,   /* default directory file-ops */
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        sysv_create,            /* create */
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        sysv_lookup,            /* lookup */
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        sysv_link,              /* link */
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        sysv_unlink,            /* unlink */
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        sysv_symlink,           /* symlink */
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        sysv_mkdir,             /* mkdir */
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        sysv_rmdir,             /* rmdir */
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        sysv_mknod,             /* mknod */
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        sysv_rename,            /* rename */
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        NULL,                   /* readlink */
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        NULL,                   /* follow_link */
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        NULL,                   /* readpage */
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        NULL,                   /* writepage */
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        NULL,                   /* bmap */
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        sysv_truncate,          /* truncate */
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        NULL                    /* permission */
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};
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static int sysv_readdir(struct inode * inode, struct file * filp,
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        void * dirent, filldir_t filldir)
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{
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        struct super_block * sb;
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        unsigned int offset,i;
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        struct buffer_head * bh;
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        char* bh_data;
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        struct sysv_dir_entry * de, sde;
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        if (!inode || !(sb = inode->i_sb) || !S_ISDIR(inode->i_mode))
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                return -EBADF;
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        if ((unsigned long)(filp->f_pos) % SYSV_DIRSIZE)
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                return -EBADF;
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        while (filp->f_pos < inode->i_size) {
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                offset = filp->f_pos & sb->sv_block_size_1;
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                bh = sysv_file_bread(inode, filp->f_pos >> sb->sv_block_size_bits, 0);
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                if (!bh) {
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                        filp->f_pos += sb->sv_block_size - offset;
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                        continue;
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                }
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                bh_data = bh->b_data;
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                while (offset < sb->sv_block_size && filp->f_pos < inode->i_size) {
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                        de = (struct sysv_dir_entry *) (offset + bh_data);
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                        if (de->inode) {
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                                /* Copy the directory entry first, because the directory
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                                 * might be modified while we sleep in filldir()...
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                                 */
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                                memcpy(&sde, de, sizeof(struct sysv_dir_entry));
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                                if (sde.inode > inode->i_sb->sv_ninodes)
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                                        printk("sysv_readdir: Bad inode number on dev "
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                                               "%s, ino %ld, offset 0x%04lx: %d is out of range\n",
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                                               kdevname(inode->i_dev),
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                                               inode->i_ino, (off_t) filp->f_pos, sde.inode);
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                                i = strnlen(sde.name, SYSV_NAMELEN);
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                                if (filldir(dirent, sde.name, i, filp->f_pos, sde.inode) < 0) {
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                                        brelse(bh);
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                                        return 0;
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                                }
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                        }
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                        offset += SYSV_DIRSIZE;
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                        filp->f_pos += SYSV_DIRSIZE;
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                }
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                brelse(bh);
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        }
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        return 0;
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}

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