diff options
Diffstat (limited to 'fs/jfs/jfs_discard.c')
| -rw-r--r-- | fs/jfs/jfs_discard.c | 29 |
1 files changed, 12 insertions, 17 deletions
diff --git a/fs/jfs/jfs_discard.c b/fs/jfs/jfs_discard.c index f76ff0a46444..4b660296caf3 100644 --- a/fs/jfs/jfs_discard.c +++ b/fs/jfs/jfs_discard.c @@ -1,19 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) Tino Reichardt, 2012 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See - * the GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/fs.h> @@ -78,7 +65,7 @@ void jfs_issue_discard(struct inode *ip, u64 blkno, u64 nblocks) int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range) { struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap; - struct bmap *bmp = JFS_SBI(ip->i_sb)->bmap; + struct bmap *bmp; struct super_block *sb = ipbmap->i_sb; int agno, agno_end; u64 start, end, minlen; @@ -96,10 +83,16 @@ int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range) if (minlen == 0) minlen = 1; - if (minlen > bmp->db_agsize || + down_read(&sb->s_umount); + bmp = JFS_SBI(ip->i_sb)->bmap; + + if (bmp == NULL || + minlen > bmp->db_agsize || start >= bmp->db_mapsize || - range->len < sb->s_blocksize) + range->len < sb->s_blocksize) { + up_read(&sb->s_umount); return -EINVAL; + } if (end >= bmp->db_mapsize) end = bmp->db_mapsize - 1; @@ -113,6 +106,8 @@ int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range) trimmed += dbDiscardAG(ip, agno, minlen); agno++; } + + up_read(&sb->s_umount); range->len = trimmed << sb->s_blocksize_bits; return 0; |