1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4  * Copyright (c) 2012-2013 Red Hat, Inc.
27 /* ----- Kernel only functions below ----- */
31 	char			*link)  in xfs_readlink_bmap_ilocked()  argument
33 	struct xfs_mount	*mp = ip->i_mount;  in xfs_readlink_bmap_ilocked()
38 	int			pathlen = ip->i_disk_size;  in xfs_readlink_bmap_ilocked()
58 		error = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0,  in xfs_readlink_bmap_ilocked()
66 		cur_chunk = bp->b_addr;  in xfs_readlink_bmap_ilocked()
68 			if (!xfs_symlink_hdr_ok(ip->i_ino, offset,  in xfs_readlink_bmap_ilocked()
70 				error = -EFSCORRUPTED;  in xfs_readlink_bmap_ilocked()
73 					offset, byte_cnt, ip->i_ino);  in xfs_readlink_bmap_ilocked()
82 		memcpy(link + offset, cur_chunk, byte_cnt);  in xfs_readlink_bmap_ilocked()
84 		pathlen -= byte_cnt;  in xfs_readlink_bmap_ilocked()
91 	link[ip->i_disk_size] = '\0';  in xfs_readlink_bmap_ilocked()
101 	char			*link)  in xfs_readlink()  argument
103 	struct xfs_mount	*mp = ip->i_mount;  in xfs_readlink()
105 	int			error = -EFSCORRUPTED;  in xfs_readlink()
110 		return -EIO;  in xfs_readlink()
114 	pathlen = ip->i_disk_size;  in xfs_readlink()
120 			 __func__, (unsigned long long) ip->i_ino,  in xfs_readlink()
126 	if (ip->i_df.if_format == XFS_DINODE_FMT_LOCAL) {  in xfs_readlink()
128 		 * The VFS crashes on a NULL pointer, so return -EFSCORRUPTED  in xfs_readlink()
131 		if (XFS_IS_CORRUPT(ip->i_mount, !ip->i_df.if_u1.if_data))  in xfs_readlink()
134 		memcpy(link, ip->i_df.if_u1.if_data, pathlen + 1);  in xfs_readlink()
137 		error = xfs_readlink_bmap_ilocked(ip, link);  in xfs_readlink()
154 	struct xfs_mount	*mp = dp->i_mount;  in xfs_symlink()
155 	struct xfs_trans	*tp = NULL;  in xfs_symlink()  local
181 		return -EIO;  in xfs_symlink()
188 		return -ENAMETOOLONG;  in xfs_symlink()
213 	resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);  in xfs_symlink()
215 	error = xfs_trans_alloc_icreate(mp, &M_RES(mp)->tr_symlink, udqp, gdqp,  in xfs_symlink()
216 			pdqp, resblks, &tp);  in xfs_symlink()
226 	if (dp->i_diflags & XFS_DIFLAG_NOSYMLINKS) {  in xfs_symlink()
227 		error = -EPERM;  in xfs_symlink()
234 	error = xfs_dialloc(&tp, dp->i_ino, S_IFLNK, &ino);  in xfs_symlink()
236 		error = xfs_init_new_inode(idmap, tp, dp, ino,  in xfs_symlink()
249 	xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);  in xfs_symlink()
255 	xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);  in xfs_symlink()
257 	resblks -= XFS_IALLOC_SPACE_RES(mp);  in xfs_symlink()
264 		ip->i_disk_size = pathlen;  in xfs_symlink()
265 		ip->i_df.if_format = XFS_DINODE_FMT_LOCAL;  in xfs_symlink()
266 		xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);  in xfs_symlink()
273 		error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,  in xfs_symlink()
278 		resblks -= fs_blocks;  in xfs_symlink()
279 		ip->i_disk_size = pathlen;  in xfs_symlink()
280 		xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);  in xfs_symlink()
289 			error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,  in xfs_symlink()
293 			bp->b_ops = &xfs_symlink_buf_ops;  in xfs_symlink()
298 			buf = bp->b_addr;  in xfs_symlink()
299 			buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset,  in xfs_symlink()
305 			pathlen -= byte_cnt;  in xfs_symlink()
308 			xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);  in xfs_symlink()
309 			xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) -  in xfs_symlink()
310 							(char *)bp->b_addr);  in xfs_symlink()
314 	i_size_write(VFS_I(ip), ip->i_disk_size);  in xfs_symlink()
319 	error = xfs_dir_createname(tp, dp, link_name, ip->i_ino, resblks);  in xfs_symlink()
322 	xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);  in xfs_symlink()
323 	xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);  in xfs_symlink()
331 		xfs_trans_set_sync(tp);  in xfs_symlink()
333 	error = xfs_trans_commit(tp);  in xfs_symlink()
345 	xfs_trans_cancel(tp);  in xfs_symlink()
373  * but allows us to catch corrupt zero-length symlinks in the verifiers.
387 	xfs_trans_t	*tp;  in xfs_inactive_symlink_rmt()  local
389 	mp = ip->i_mount;  in xfs_inactive_symlink_rmt()
390 	ASSERT(!xfs_need_iread_extents(&ip->i_df));  in xfs_inactive_symlink_rmt()
398 	ASSERT(ip->i_df.if_nextents > 0 && ip->i_df.if_nextents <= 2);  in xfs_inactive_symlink_rmt()
400 	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);  in xfs_inactive_symlink_rmt()
405 	xfs_trans_ijoin(tp, ip, 0);  in xfs_inactive_symlink_rmt()
413 	size = (int)ip->i_disk_size;  in xfs_inactive_symlink_rmt()
414 	ip->i_disk_size = 0;  in xfs_inactive_symlink_rmt()
415 	VFS_I(ip)->i_mode = (VFS_I(ip)->i_mode & ~S_IFMT) | S_IFREG;  in xfs_inactive_symlink_rmt()
416 	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);  in xfs_inactive_symlink_rmt()
430 		error = xfs_trans_get_buf(tp, mp->m_ddev_targp,  in xfs_inactive_symlink_rmt()
436 		xfs_trans_binval(tp, bp);  in xfs_inactive_symlink_rmt()
441 	error = xfs_bunmapi(tp, ip, 0, size, 0, nmaps, &done);  in xfs_inactive_symlink_rmt()
450 	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);  in xfs_inactive_symlink_rmt()
451 	error = xfs_trans_commit(tp);  in xfs_inactive_symlink_rmt()
460 	if (ip->i_df.if_bytes)  in xfs_inactive_symlink_rmt()
461 		xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);  in xfs_inactive_symlink_rmt()
462 	ASSERT(ip->i_df.if_bytes == 0);  in xfs_inactive_symlink_rmt()
468 	xfs_trans_cancel(tp);  in xfs_inactive_symlink_rmt()
475  * xfs_inactive_symlink - free a symlink
481 	struct xfs_mount	*mp = ip->i_mount;  in xfs_inactive_symlink()
487 		return -EIO;  in xfs_inactive_symlink()
490 	pathlen = (int)ip->i_disk_size;  in xfs_inactive_symlink()
495 			 __func__, (unsigned long long)ip->i_ino, pathlen);  in xfs_inactive_symlink()
498 		return -EFSCORRUPTED;  in xfs_inactive_symlink()
505 	if (ip->i_df.if_format == XFS_DINODE_FMT_LOCAL) {  in xfs_inactive_symlink()