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zonefs: prevent use of seq files as swap file

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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: 8dcc1a9d90 ("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>
This commit is contained in:
Damien Le Moal 2021-03-15 12:43:55 +09:00
parent 1e28eed176
commit 1601ea068b
1 changed files with 16 additions and 0 deletions
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16
fs/zonefs/super.c
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@ -165,6 +165,21 @@ static int zonefs_writepages(struct address_space *mapping,
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,
@ -177,6 +192,7 @@ static const struct address_space_operations zonefs_file_aops = {
.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)