diff options
Diffstat (limited to 'fs/ufs/symlink.c')
-rw-r--r-- | fs/ufs/symlink.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/fs/ufs/symlink.c b/fs/ufs/symlink.c new file mode 100644 index 000000000..9d18c5f53 --- /dev/null +++ b/fs/ufs/symlink.c @@ -0,0 +1,138 @@ +/* + * linux/ufs/ufs/symlink.c + * + * Copyright (C) 1998 + * Daniel Pirkl <daniel.pirkl@emai.cz> + * Charles University, Faculty of Mathematics and Physics + * + * from + * + * linux/fs/ext2/symlink.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * from + * + * linux/fs/minix/symlink.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * ext2 symlink handling code + */ + +#include <asm/uaccess.h> + +#include <linux/errno.h> +#include <linux/fs.h> +#include <linux/ext2_fs.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/stat.h> + + +#undef UFS_SYMLINK_DEBUG + +#ifdef UFS_SYMLINK_DEBUG +#define UFSD(x) printk("(%s, %d), %s:", __FILE__, __LINE__, __FUNCTION__); printk x; +#else +#define UFSD(x) +#endif + + +static struct dentry * ufs_follow_link(struct dentry * dentry, + struct dentry * base) +{ + struct inode * inode; + struct buffer_head * bh; + int error; + char * link; + + UFSD(("ENTER\n")) + + inode = dentry->d_inode; + bh = NULL; + /* slow symlink */ + if (inode->i_blocks) { + if (!(bh = ufs_bread (inode, 0, 0, &error))) { + dput(base); + return ERR_PTR(-EIO); + } + link = bh->b_data; + } + /* fast symlink */ + else { + link = (char *) inode->u.ufs_i.i_u1.i_symlink; + } + UPDATE_ATIME(inode); + base = lookup_dentry(link, base, 1); + if (bh) + brelse(bh); + UFSD(("EXIT\n")) + return base; +} + +static int ufs_readlink (struct dentry * dentry, char * buffer, int buflen) +{ + struct super_block * sb; + struct inode * inode; + struct buffer_head * bh; + char * link; + int i; + + UFSD(("ENTER\n")) + + inode = dentry->d_inode; + sb = inode->i_sb; + bh = NULL; + if (buflen > sb->s_blocksize - 1) + buflen = sb->s_blocksize - 1; + /* slow symlink */ + if (inode->i_blocks) { + int err; + bh = ufs_bread (inode, 0, 0, &err); + if (!bh) { + if(err < 0) /* indicate type of error */ + return err; + return 0; + } + link = bh->b_data; + } + /* fast symlink */ + else { + link = (char *) inode->u.ufs_i.i_u1.i_symlink; + } + i = 0; + while (i < buflen && link[i]) + i++; + if (copy_to_user(buffer, link, i)) + i = -EFAULT; + UPDATE_ATIME(inode); + if (bh) + brelse (bh); + UFSD(("ENTER\n")) + return i; +} + +struct inode_operations ufs_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 */ + ufs_readlink, /* readlink */ + ufs_follow_link, /* follow_link */ + NULL, /* readpage */ + NULL, /* writepage */ + NULL, /* bmap */ + NULL, /* truncate */ + NULL, /* permission */ + NULL /* smap */ +}; |