| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.11 017/120] zonefs: prevent use of seq files as swap file | Date | Mon, 22 Mar 2021 13:26:40 +0100 |
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From: Damien Le Moal <damien.lemoal@wdc.com>
commit 1601ea068b886da1f8f8d4e18b9403e9e24adef6 upstream.
The sequential write constraint of sequential zone file prevent their use as swap files. Only allow conventional zone files to be used as swap files.
Fixes: 8dcc1a9d90c1 ("fs: New zonefs file system") Cc: <stable@vger.kernel.org> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- fs/zonefs/super.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
--- a/fs/zonefs/super.c +++ b/fs/zonefs/super.c @@ -159,6 +159,21 @@ static int zonefs_writepages(struct addr return iomap_writepages(mapping, wbc, &wpc, &zonefs_writeback_ops); } +static int zonefs_swap_activate(struct swap_info_struct *sis, + struct file *swap_file, sector_t *span) +{ + struct inode *inode = file_inode(swap_file); + struct zonefs_inode_info *zi = ZONEFS_I(inode); + + if (zi->i_ztype != ZONEFS_ZTYPE_CNV) { + zonefs_err(inode->i_sb, + "swap file: not a conventional zone file\n"); + return -EINVAL; + } + + return iomap_swapfile_activate(sis, swap_file, span, &zonefs_iomap_ops); +} + static const struct address_space_operations zonefs_file_aops = { .readpage = zonefs_readpage, .readahead = zonefs_readahead, @@ -171,6 +186,7 @@ static const struct address_space_operat .is_partially_uptodate = iomap_is_partially_uptodate, .error_remove_page = generic_error_remove_page, .direct_IO = noop_direct_IO, + .swap_activate = zonefs_swap_activate, }; static void zonefs_update_stats(struct inode *inode, loff_t new_isize)
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