?? symlink.c
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/* * linux/fs/xiafs/symlink.c * * Copyright (C) Q. Frank Xia, 1993. * * Based on Linus' minix/symlink.c * Copyright (C) Linus Torvalds, 1991, 1992. * * This software may be redistributed per Linux Copyright. */#include <linux/errno.h>#include <linux/sched.h>#include <linux/fs.h>#include <linux/xia_fs.h>#include <linux/stat.h>#include <asm/segment.h>static int xiafs_readlink(struct inode *, char *, int);static int xiafs_follow_link(struct inode *, struct inode *, int, int, struct inode **);/* * symlinks can't do much... */struct inode_operations xiafs_symlink_inode_operations = { NULL, /* no file-operations */ NULL, /* create */ NULL, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ xiafs_readlink, /* readlink */ xiafs_follow_link, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */};static int xiafs_readlink(struct inode * inode, char * buffer, int buflen){ struct buffer_head * bh; int i; char c; if (!S_ISLNK(inode->i_mode)) { iput(inode); return -EINVAL; } if (buflen > BLOCK_SIZE) buflen = BLOCK_SIZE; bh = xiafs_bread(inode, 0, 0); if (!IS_RDONLY (inode)) { inode->i_atime=CURRENT_TIME; inode->i_dirt=1; } iput(inode); if (!bh) return 0; for (i=0; i < buflen && (c=bh->b_data[i]); i++) put_user(c, buffer++); if (i < buflen-1) put_user('\0', buffer); brelse(bh); return i;}static int xiafs_follow_link(struct inode * dir, struct inode * inode, int flag, int mode, struct inode ** res_inode){ int error; struct buffer_head * bh; *res_inode = NULL; if (!dir) { dir = current->fs->root; dir->i_count++; } if (!inode) { iput(dir); return -ENOENT; } if (!S_ISLNK(inode->i_mode)) { iput(dir); *res_inode = inode; return 0; } if (!IS_RDONLY (inode)) { inode->i_atime=CURRENT_TIME; inode->i_dirt=1; } if (current->link_count > 5) { iput(inode); iput(dir); return -ELOOP; } if (!(bh = xiafs_bread(inode, 0, 0))) { iput(inode); iput(dir); return -EIO; } iput(inode); current->link_count++; error = open_namei(bh->b_data,flag,mode,res_inode,dir); current->link_count--; brelse(bh); return error;}
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