diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c index 84350e1be66d..4e64352d49de 100644 --- a/fs/gfs2/ops_inode.c +++ b/fs/gfs2/ops_inode.c @@ -975,103 +975,12 @@ out: return error; } -/** - * gfs2_readlinki - return the contents of a symlink - * @ip: the symlink's inode - * @buf: a pointer to the buffer to be filled - * @len: a pointer to the length of @buf - * - * If @buf is too small, a piece of memory is kmalloc()ed and needs - * to be freed by the caller. - * - * Returns: errno - */ - -static int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) -{ - struct gfs2_holder i_gh; - struct buffer_head *dibh; - unsigned int x; - int error; - - gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); - error = gfs2_glock_nq(&i_gh); - if (error) { - gfs2_holder_uninit(&i_gh); - return error; - } - - if (!ip->i_disksize) { - gfs2_consist_inode(ip); - error = -EIO; - goto out; - } - - error = gfs2_meta_inode_buffer(ip, &dibh); - if (error) - goto out; - - x = ip->i_disksize + 1; - if (x > *len) { - *buf = kmalloc(x, GFP_NOFS); - if (!*buf) { - error = -ENOMEM; - goto out_brelse; - } - } - - memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); - *len = x; - -out_brelse: - brelse(dibh); -out: - gfs2_glock_dq_uninit(&i_gh); - return error; -} - -/** - * gfs2_readlink - Read the value of a symlink - * @dentry: the symlink - * @buf: the buffer to read the symlink data into - * @size: the size of the buffer - * - * Returns: errno - */ - -static int gfs2_readlink(struct dentry *dentry, char __user *user_buf, - int user_size) -{ - struct gfs2_inode *ip = GFS2_I(dentry->d_inode); - char array[GFS2_FAST_NAME_SIZE], *buf = array; - unsigned int len = GFS2_FAST_NAME_SIZE; - int error; - - error = gfs2_readlinki(ip, &buf, &len); - if (error) - return error; - - if (user_size > len - 1) - user_size = len - 1; - - if (copy_to_user(user_buf, buf, user_size)) - error = -EFAULT; - else - error = user_size; - - if (buf != array) - kfree(buf); - - return error; -} - /** * gfs2_follow_link - Follow a symbolic link * @dentry: The dentry of the link * @nd: Data that we pass to vfs_follow_link() * - * This can handle symlinks of any size. It is optimised for symlinks - * under GFS2_FAST_NAME_SIZE. + * This can handle symlinks of any size. * * Returns: 0 on success or error code */ @@ -1079,19 +988,50 @@ static int gfs2_readlink(struct dentry *dentry, char __user *user_buf, static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) { struct gfs2_inode *ip = GFS2_I(dentry->d_inode); - char array[GFS2_FAST_NAME_SIZE], *buf = array; - unsigned int len = GFS2_FAST_NAME_SIZE; + struct gfs2_holder i_gh; + struct buffer_head *dibh; + unsigned int x; + char *buf; int error; - error = gfs2_readlinki(ip, &buf, &len); - if (!error) { - error = vfs_follow_link(nd, buf); - if (buf != array) - kfree(buf); - } else - path_put(&nd->path); + gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); + error = gfs2_glock_nq(&i_gh); + if (error) { + gfs2_holder_uninit(&i_gh); + nd_set_link(nd, ERR_PTR(error)); + return NULL; + } - return ERR_PTR(error); + if (!ip->i_disksize) { + gfs2_consist_inode(ip); + buf = ERR_PTR(-EIO); + goto out; + } + + error = gfs2_meta_inode_buffer(ip, &dibh); + if (error) { + buf = ERR_PTR(error); + goto out; + } + + x = ip->i_disksize + 1; + buf = kmalloc(x, GFP_NOFS); + if (!buf) + buf = ERR_PTR(-ENOMEM); + else + memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), x); + brelse(dibh); +out: + gfs2_glock_dq_uninit(&i_gh); + nd_set_link(nd, buf); + return NULL; +} + +static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) +{ + char *s = nd_get_link(nd); + if (!IS_ERR(s)) + kfree(s); } /** @@ -1426,8 +1366,9 @@ const struct inode_operations gfs2_dir_iops = { }; const struct inode_operations gfs2_symlink_iops = { - .readlink = gfs2_readlink, + .readlink = generic_readlink, .follow_link = gfs2_follow_link, + .put_link = gfs2_put_link, .permission = gfs2_permission, .setattr = gfs2_setattr, .getattr = gfs2_getattr,