1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4  * Copyright (c) 2012-2013 Red Hat, Inc.
25 /* ----- Kernel only functions below ----- */
29 	char			*link)  in xfs_readlink_bmap_ilocked()  argument
31 	struct xfs_mount	*mp = ip->i_mount;  in xfs_readlink_bmap_ilocked()
36 	int			pathlen = ip->i_d.di_size;  in xfs_readlink_bmap_ilocked()
56 		error = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0,  in xfs_readlink_bmap_ilocked()
64 		cur_chunk = bp->b_addr;  in xfs_readlink_bmap_ilocked()
65 		if (xfs_sb_version_hascrc(&mp->m_sb)) {  in xfs_readlink_bmap_ilocked()
66 			if (!xfs_symlink_hdr_ok(ip->i_ino, offset,  in xfs_readlink_bmap_ilocked()
68 				error = -EFSCORRUPTED;  in xfs_readlink_bmap_ilocked()
71 					offset, byte_cnt, ip->i_ino);  in xfs_readlink_bmap_ilocked()
80 		memcpy(link + offset, cur_chunk, byte_cnt);  in xfs_readlink_bmap_ilocked()
82 		pathlen -= byte_cnt;  in xfs_readlink_bmap_ilocked()
89 	link[ip->i_d.di_size] = '\0';  in xfs_readlink_bmap_ilocked()
99 	char		*link)  in xfs_readlink()  argument
101 	struct xfs_mount *mp = ip->i_mount;  in xfs_readlink()
107 	ASSERT(!(ip->i_df.if_flags & XFS_IFINLINE));  in xfs_readlink()
110 		return -EIO;  in xfs_readlink()
114 	pathlen = ip->i_d.di_size;  in xfs_readlink()
120 			 __func__, (unsigned long long) ip->i_ino,  in xfs_readlink()
123 		error = -EFSCORRUPTED;  in xfs_readlink()
128 	error = xfs_readlink_bmap_ilocked(ip, link);  in xfs_readlink()
143 	struct xfs_mount	*mp = dp->i_mount;  in xfs_symlink()
144 	struct xfs_trans	*tp = NULL;  in xfs_symlink()  local
169 		return -EIO;  in xfs_symlink()
176 		return -ENAMETOOLONG;  in xfs_symlink()
198 	resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);  in xfs_symlink()
200 	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_symlink, resblks, 0, 0, &tp);  in xfs_symlink()
210 	if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {  in xfs_symlink()
211 		error = -EPERM;  in xfs_symlink()
218 	error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,  in xfs_symlink()
226 	error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,  in xfs_symlink()
238 	xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);  in xfs_symlink()
244 	xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);  in xfs_symlink()
246 	resblks -= XFS_IALLOC_SPACE_RES(mp);  in xfs_symlink()
253 		ip->i_d.di_size = pathlen;  in xfs_symlink()
254 		ip->i_df.if_format = XFS_DINODE_FMT_LOCAL;  in xfs_symlink()
255 		xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);  in xfs_symlink()
262 		error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,  in xfs_symlink()
267 		resblks -= fs_blocks;  in xfs_symlink()
268 		ip->i_d.di_size = pathlen;  in xfs_symlink()
269 		xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);  in xfs_symlink()
278 			error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,  in xfs_symlink()
282 			bp->b_ops = &xfs_symlink_buf_ops;  in xfs_symlink()
287 			buf = bp->b_addr;  in xfs_symlink()
288 			buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset,  in xfs_symlink()
294 			pathlen -= byte_cnt;  in xfs_symlink()
297 			xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);  in xfs_symlink()
298 			xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) -  in xfs_symlink()
299 							(char *)bp->b_addr);  in xfs_symlink()
303 	i_size_write(VFS_I(ip), ip->i_d.di_size);  in xfs_symlink()
308 	error = xfs_dir_createname(tp, dp, link_name, ip->i_ino, resblks);  in xfs_symlink()
311 	xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);  in xfs_symlink()
312 	xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);  in xfs_symlink()
319 	if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {  in xfs_symlink()
320 		xfs_trans_set_sync(tp);  in xfs_symlink()
323 	error = xfs_trans_commit(tp);  in xfs_symlink()
335 	xfs_trans_cancel(tp);  in xfs_symlink()
363  * but allows us to catch corrupt zero-length symlinks in the verifiers.
377 	xfs_trans_t	*tp;  in xfs_inactive_symlink_rmt()  local
379 	mp = ip->i_mount;  in xfs_inactive_symlink_rmt()
380 	ASSERT(ip->i_df.if_flags & XFS_IFEXTENTS);  in xfs_inactive_symlink_rmt()
388 	ASSERT(ip->i_df.if_nextents > 0 && ip->i_df.if_nextents <= 2);  in xfs_inactive_symlink_rmt()
390 	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);  in xfs_inactive_symlink_rmt()
395 	xfs_trans_ijoin(tp, ip, 0);  in xfs_inactive_symlink_rmt()
403 	size = (int)ip->i_d.di_size;  in xfs_inactive_symlink_rmt()
404 	ip->i_d.di_size = 0;  in xfs_inactive_symlink_rmt()
405 	VFS_I(ip)->i_mode = (VFS_I(ip)->i_mode & ~S_IFMT) | S_IFREG;  in xfs_inactive_symlink_rmt()
406 	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);  in xfs_inactive_symlink_rmt()
420 		error = xfs_trans_get_buf(tp, mp->m_ddev_targp,  in xfs_inactive_symlink_rmt()
426 		xfs_trans_binval(tp, bp);  in xfs_inactive_symlink_rmt()
431 	error = xfs_bunmapi(tp, ip, 0, size, 0, nmaps, &done);  in xfs_inactive_symlink_rmt()
440 	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);  in xfs_inactive_symlink_rmt()
441 	error = xfs_trans_commit(tp);  in xfs_inactive_symlink_rmt()
450 	if (ip->i_df.if_bytes)  in xfs_inactive_symlink_rmt()
451 		xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);  in xfs_inactive_symlink_rmt()
452 	ASSERT(ip->i_df.if_bytes == 0);  in xfs_inactive_symlink_rmt()
458 	xfs_trans_cancel(tp);  in xfs_inactive_symlink_rmt()
465  * xfs_inactive_symlink - free a symlink
471 	struct xfs_mount	*mp = ip->i_mount;  in xfs_inactive_symlink()
477 		return -EIO;  in xfs_inactive_symlink()
480 	pathlen = (int)ip->i_d.di_size;  in xfs_inactive_symlink()
485 			 __func__, (unsigned long long)ip->i_ino, pathlen);  in xfs_inactive_symlink()
488 		return -EFSCORRUPTED;  in xfs_inactive_symlink()
495 	if (ip->i_df.if_flags & XFS_IFINLINE) {  in xfs_inactive_symlink()