f2fs: fix to add swap extent correctly
commit5.4-rM2-2.2.x-imx-squashed3e5e479a39
upstream. As Youling reported in mailing list: https://www.linuxquestions.org/questions/linux-newbie-8/the-file-system-f2fs-is-broken-4175666043/ https://www.linux.org/threads/the-file-system-f2fs-is-broken.26490/ There is a test case can corrupt f2fs image: - dd if=/dev/zero of=/swapfile bs=1M count=4096 - chmod 600 /swapfile - mkswap /swapfile - swapon --discard /swapfile The root cause is f2fs_swap_activate() intends to return zero value to setup_swap_extents() to enable SWP_FS mode (swap file goes through fs), in this flow, setup_swap_extents() setups swap extent with wrong block address range, result in discard_swap() erasing incorrect address. Because f2fs_swap_activate() has pinned swapfile, its data block address will not change, it's safe to let swap to handle IO through raw device, so we can get rid of SWAP_FS mode and initial swap extents inside f2fs_swap_activate(), by this way, later discard_swap() can trim in right address range. Fixes:4969c06a0d
("f2fs: support swap file w/ DIO") Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
parent
a25ae55390
commit
7fd3329a4d
|
@ -3030,7 +3030,8 @@ int f2fs_migrate_page(struct address_space *mapping,
|
|||
|
||||
#ifdef CONFIG_SWAP
|
||||
/* Copied from generic_swapfile_activate() to check any holes */
|
||||
static int check_swap_activate(struct file *swap_file, unsigned int max)
|
||||
static int check_swap_activate(struct swap_info_struct *sis,
|
||||
struct file *swap_file, sector_t *span)
|
||||
{
|
||||
struct address_space *mapping = swap_file->f_mapping;
|
||||
struct inode *inode = mapping->host;
|
||||
|
@ -3041,6 +3042,8 @@ static int check_swap_activate(struct file *swap_file, unsigned int max)
|
|||
sector_t last_block;
|
||||
sector_t lowest_block = -1;
|
||||
sector_t highest_block = 0;
|
||||
int nr_extents = 0;
|
||||
int ret;
|
||||
|
||||
blkbits = inode->i_blkbits;
|
||||
blocks_per_page = PAGE_SIZE >> blkbits;
|
||||
|
@ -3052,7 +3055,8 @@ static int check_swap_activate(struct file *swap_file, unsigned int max)
|
|||
probe_block = 0;
|
||||
page_no = 0;
|
||||
last_block = i_size_read(inode) >> blkbits;
|
||||
while ((probe_block + blocks_per_page) <= last_block && page_no < max) {
|
||||
while ((probe_block + blocks_per_page) <= last_block &&
|
||||
page_no < sis->max) {
|
||||
unsigned block_in_page;
|
||||
sector_t first_block;
|
||||
|
||||
|
@ -3092,13 +3096,27 @@ static int check_swap_activate(struct file *swap_file, unsigned int max)
|
|||
highest_block = first_block;
|
||||
}
|
||||
|
||||
/*
|
||||
* We found a PAGE_SIZE-length, PAGE_SIZE-aligned run of blocks
|
||||
*/
|
||||
ret = add_swap_extent(sis, page_no, 1, first_block);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
nr_extents += ret;
|
||||
page_no++;
|
||||
probe_block += blocks_per_page;
|
||||
reprobe:
|
||||
continue;
|
||||
}
|
||||
return 0;
|
||||
|
||||
ret = nr_extents;
|
||||
*span = 1 + highest_block - lowest_block;
|
||||
if (page_no == 0)
|
||||
page_no = 1; /* force Empty message */
|
||||
sis->max = page_no;
|
||||
sis->pages = page_no - 1;
|
||||
sis->highest_bit = page_no - 1;
|
||||
out:
|
||||
return ret;
|
||||
bad_bmap:
|
||||
pr_err("swapon: swapfile has holes\n");
|
||||
return -EINVAL;
|
||||
|
@ -3120,14 +3138,14 @@ static int f2fs_swap_activate(struct swap_info_struct *sis, struct file *file,
|
|||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = check_swap_activate(file, sis->max);
|
||||
if (ret)
|
||||
ret = check_swap_activate(sis, file, span);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
set_inode_flag(inode, FI_PIN_FILE);
|
||||
f2fs_precache_extents(inode);
|
||||
f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
|
||||
return 0;
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void f2fs_swap_deactivate(struct file *file)
|
||||
|
|
Loading…
Reference in New Issue