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[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [fs/] [ext/] [symlink.c] - Rev 1782
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/* * linux/fs/ext/symlink.c * * Copyright (C) 1992 Remy Card (card@masi.ibp.fr) * * from * * linux/fs/minix/symlink.c * * Copyright (C) 1991, 1992 Linus Torvalds * * ext symlink handling code */ #include <asm/segment.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/fs.h> #include <linux/ext_fs.h> #include <linux/stat.h> static int ext_readlink(struct inode *, char *, int); static int ext_follow_link(struct inode *, struct inode *, int, int, struct inode **); /* * symlinks can't do much... */ struct inode_operations ext_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 */ ext_readlink, /* readlink */ ext_follow_link, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; static int ext_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 (current->link_count > 5) { iput(dir); iput(inode); return -ELOOP; } if (!(bh = ext_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; } static int ext_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 > 1023) buflen = 1023; bh = ext_bread(inode, 0, 0); iput(inode); if (!bh) return 0; i = 0; while (i<buflen && (c = bh->b_data[i])) { i++; put_user(c,buffer++); } brelse(bh); return i; }
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