1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4  * Copyright (c) 2012-2013 Red Hat, Inc.
33 	int buflen = XFS_SYMLINK_BUF_SPACE(mp, mp->m_sb.sb_blocksize);  in xfs_symlink_blocks()
35 	return (pathlen + buflen - 1) / buflen;  in xfs_symlink_blocks()
46 	struct xfs_dsymlink_hdr	*dsl = bp->b_addr;  in xfs_symlink_hdr_set()
52 	dsl->sl_magic = cpu_to_be32(XFS_SYMLINK_MAGIC);  in xfs_symlink_hdr_set()
53 	dsl->sl_offset = cpu_to_be32(offset);  in xfs_symlink_hdr_set()
54 	dsl->sl_bytes = cpu_to_be32(size);  in xfs_symlink_hdr_set()
55 	uuid_copy(&dsl->sl_uuid, &mp->m_sb.sb_meta_uuid);  in xfs_symlink_hdr_set()
56 	dsl->sl_owner = cpu_to_be64(ino);  in xfs_symlink_hdr_set()
57 	dsl->sl_blkno = cpu_to_be64(xfs_buf_daddr(bp));  in xfs_symlink_hdr_set()
58 	bp->b_ops = &xfs_symlink_buf_ops;  in xfs_symlink_hdr_set()
75 	struct xfs_dsymlink_hdr *dsl = bp->b_addr;  in xfs_symlink_hdr_ok()
77 	if (offset != be32_to_cpu(dsl->sl_offset))  in xfs_symlink_hdr_ok()
79 	if (size != be32_to_cpu(dsl->sl_bytes))  in xfs_symlink_hdr_ok()
81 	if (ino != be64_to_cpu(dsl->sl_owner))  in xfs_symlink_hdr_ok()
92 	struct xfs_mount	*mp = bp->b_mount;  in xfs_symlink_verify()
93 	struct xfs_dsymlink_hdr	*dsl = bp->b_addr;  in xfs_symlink_verify()
97 	if (!xfs_verify_magic(bp, dsl->sl_magic))  in xfs_symlink_verify()
99 	if (!uuid_equal(&dsl->sl_uuid, &mp->m_sb.sb_meta_uuid))  in xfs_symlink_verify()
101 	if (xfs_buf_daddr(bp) != be64_to_cpu(dsl->sl_blkno))  in xfs_symlink_verify()
103 	if (be32_to_cpu(dsl->sl_offset) +  in xfs_symlink_verify()
104 				be32_to_cpu(dsl->sl_bytes) >= XFS_SYMLINK_MAXLEN)  in xfs_symlink_verify()
106 	if (dsl->sl_owner == 0)  in xfs_symlink_verify()
108 	if (!xfs_log_check_lsn(mp, be64_to_cpu(dsl->sl_lsn)))  in xfs_symlink_verify()
118 	struct xfs_mount *mp = bp->b_mount;  in xfs_symlink_read_verify()
121 	/* no verification of non-crc buffers */  in xfs_symlink_read_verify()
126 		xfs_verifier_error(bp, -EFSBADCRC, __this_address);  in xfs_symlink_read_verify()
130 			xfs_verifier_error(bp, -EFSCORRUPTED, fa);  in xfs_symlink_read_verify()
138 	struct xfs_mount *mp = bp->b_mount;  in xfs_symlink_write_verify()
139 	struct xfs_buf_log_item	*bip = bp->b_log_item;  in xfs_symlink_write_verify()
142 	/* no verification of non-crc buffers */  in xfs_symlink_write_verify()
148 		xfs_verifier_error(bp, -EFSCORRUPTED, fa);  in xfs_symlink_write_verify()
153 		struct xfs_dsymlink_hdr *dsl = bp->b_addr;  in xfs_symlink_write_verify()
154 		dsl->sl_lsn = cpu_to_be64(bip->bli_item.li_lsn);  in xfs_symlink_write_verify()
169 	struct xfs_trans	*tp,  in xfs_symlink_local_to_remote()  argument
175 	struct xfs_mount	*mp = ip->i_mount;  in xfs_symlink_local_to_remote()
178 	xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);  in xfs_symlink_local_to_remote()
181 		bp->b_ops = NULL;  in xfs_symlink_local_to_remote()
182 		memcpy(bp->b_addr, ifp->if_data, ifp->if_bytes);  in xfs_symlink_local_to_remote()
183 		xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);  in xfs_symlink_local_to_remote()
191 	ASSERT(BBTOB(bp->b_length) >=  in xfs_symlink_local_to_remote()
192 			ifp->if_bytes + sizeof(struct xfs_dsymlink_hdr));  in xfs_symlink_local_to_remote()
194 	bp->b_ops = &xfs_symlink_buf_ops;  in xfs_symlink_local_to_remote()
196 	buf = bp->b_addr;  in xfs_symlink_local_to_remote()
197 	buf += xfs_symlink_hdr_set(mp, ip->i_ino, 0, ifp->if_bytes, bp);  in xfs_symlink_local_to_remote()
198 	memcpy(buf, ifp->if_data, ifp->if_bytes);  in xfs_symlink_local_to_remote()
199 	xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsymlink_hdr) +  in xfs_symlink_local_to_remote()
200 					ifp->if_bytes - 1);  in xfs_symlink_local_to_remote()
204  * Verify the in-memory consistency of an inline symlink data fork. This
205  * does not do on-disk format checks.
226 	if (memchr(sfp, 0, size - 1))  in xfs_symlink_shortform_verify()
229 	/* We /did/ null-terminate the buffer, right? */  in xfs_symlink_shortform_verify()
239 	char			*link)  in xfs_symlink_remote_read()  argument
241 	struct xfs_mount	*mp = ip->i_mount;  in xfs_symlink_remote_read()
246 	int			pathlen = ip->i_disk_size;  in xfs_symlink_remote_read()
266 		error = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0,  in xfs_symlink_remote_read()
276 		cur_chunk = bp->b_addr;  in xfs_symlink_remote_read()
278 			if (!xfs_symlink_hdr_ok(ip->i_ino, offset,  in xfs_symlink_remote_read()
281 				error = -EFSCORRUPTED;  in xfs_symlink_remote_read()
284 					offset, byte_cnt, ip->i_ino);  in xfs_symlink_remote_read()
293 		memcpy(link + offset, cur_chunk, byte_cnt);  in xfs_symlink_remote_read()
295 		pathlen -= byte_cnt;  in xfs_symlink_remote_read()
302 	link[ip->i_disk_size] = '\0';  in xfs_symlink_remote_read()
312 	struct xfs_trans	*tp,  in xfs_symlink_write_target()  argument
321 	struct xfs_mount	*mp = tp->t_mountp;  in xfs_symlink_write_target()
337 		ip->i_disk_size = pathlen;  in xfs_symlink_write_target()
338 		ip->i_df.if_format = XFS_DINODE_FMT_LOCAL;  in xfs_symlink_write_target()
339 		xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);  in xfs_symlink_write_target()
344 	error = xfs_bmapi_write(tp, ip, 0, fs_blocks, XFS_BMAPI_METADATA,  in xfs_symlink_write_target()
349 	ip->i_disk_size = pathlen;  in xfs_symlink_write_target()
350 	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);  in xfs_symlink_write_target()
359 		error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,  in xfs_symlink_write_target()
363 		bp->b_ops = &xfs_symlink_buf_ops;  in xfs_symlink_write_target()
368 		buf = bp->b_addr;  in xfs_symlink_write_target()
374 		pathlen -= byte_cnt;  in xfs_symlink_write_target()
377 		xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);  in xfs_symlink_write_target()
378 		xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) -  in xfs_symlink_write_target()
379 						(char *)bp->b_addr);  in xfs_symlink_write_target()
388 	struct xfs_trans	*tp,  in xfs_symlink_remote_truncate()  argument
392 	struct xfs_mount	*mp = tp->t_mountp;  in xfs_symlink_remote_truncate()
408 		error = xfs_trans_get_buf(tp, mp->m_ddev_targp,  in xfs_symlink_remote_truncate()
415 		xfs_trans_binval(tp, bp);  in xfs_symlink_remote_truncate()
419 	error = xfs_bunmapi(tp, ip, 0, XFS_MAX_FILEOFF, 0, nmaps, &done);  in xfs_symlink_remote_truncate()
425 		return -EFSCORRUPTED;  in xfs_symlink_remote_truncate()
428 	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);  in xfs_symlink_remote_truncate()