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f2fs: Fix use of number of devices

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For a single device mount using a zoned block device, the zone
information for the device is stored in the sbi->devs single entry
array and sbi->s_ndevs is set to 1. This differs from a single device
mount using a regular block device which does not allocate sbi->devs
and sets sbi->s_ndevs to 0.

However, sbi->s_devs == 0 condition is used throughout the code to
differentiate a single device mount from a multi-device mount where
sbi->s_ndevs is always larger than 1. This results in problems with
single zoned block device volumes as these are treated as multi-device
mounts but do not have the start_blk and end_blk information set. One
of the problem observed is skipping of zone discard issuing resulting in
write commands being issued to full zones or unaligned to a zone write
pointer.

Fix this problem by simply treating the cases sbi->s_ndevs == 0 (single
regular block device mount) and sbi->s_ndevs == 1 (single zoned block
device mount) in the same manner. This is done by introducing the
helper function f2fs_is_multi_device() and using this helper in place
of direct tests of sbi->s_ndevs value, improving code readability.

Fixes: 7bb3a371d1 ("f2fs: Fix zoned block device support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Damien Le Moal 2019-03-16 09:13:06 +09:00 committed by Jaegeuk Kim
parent 8ed86627f7
commit 0916878da3
5 changed files with 32 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
fs/f2fs/data.c
View File

@ -220,12 +220,14 @@ struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
struct block_device *bdev = sbi->sb->s_bdev;
int i;
for (i = 0; i < sbi->s_ndevs; i++) {
if (FDEV(i).start_blk <= blk_addr &&
FDEV(i).end_blk >= blk_addr) {
blk_addr -= FDEV(i).start_blk;
bdev = FDEV(i).bdev;
break;
if (f2fs_is_multi_device(sbi)) {
for (i = 0; i < sbi->s_ndevs; i++) {
if (FDEV(i).start_blk <= blk_addr &&
FDEV(i).end_blk >= blk_addr) {
blk_addr -= FDEV(i).start_blk;
bdev = FDEV(i).bdev;
break;
}
}
}
if (bio) {
@ -239,6 +241,9 @@ int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr)
{
int i;
if (!f2fs_is_multi_device(sbi))
return 0;
for (i = 0; i < sbi->s_ndevs; i++)
if (FDEV(i).start_blk <= blkaddr && FDEV(i).end_blk >= blkaddr)
return i;

13
fs/f2fs/f2fs.h
View File

@ -1366,6 +1366,17 @@ static inline bool time_to_inject(struct f2fs_sb_info *sbi, int type)
}
#endif
/*
* Test if the mounted volume is a multi-device volume.
* - For a single regular disk volume, sbi->s_ndevs is 0.
* - For a single zoned disk volume, sbi->s_ndevs is 1.
* - For a multi-device volume, sbi->s_ndevs is always 2 or more.
*/
static inline bool f2fs_is_multi_device(struct f2fs_sb_info *sbi)
{
return sbi->s_ndevs > 1;
}
/* For write statistics. Suppose sector size is 512 bytes,
* and the return value is in kbytes. s is of struct f2fs_sb_info.
*/
@ -3615,7 +3626,7 @@ static inline bool f2fs_force_buffered_io(struct inode *inode,
if (f2fs_post_read_required(inode))
return true;
if (sbi->s_ndevs)
if (f2fs_is_multi_device(sbi))
return true;
/*
* for blkzoned device, fallback direct IO to buffered IO, so

2
fs/f2fs/file.c
View File

@ -2573,7 +2573,7 @@ static int f2fs_ioc_flush_device(struct file *filp, unsigned long arg)
sizeof(range)))
return -EFAULT;
if (sbi->s_ndevs <= 1 || sbi->s_ndevs - 1 <= range.dev_num ||
if (!f2fs_is_multi_device(sbi) || sbi->s_ndevs - 1 <= range.dev_num ||
__is_large_section(sbi)) {
f2fs_msg(sbi->sb, KERN_WARNING,
"Can't flush %u in %d for segs_per_sec %u != 1\n",

2
fs/f2fs/gc.c
View File

@ -1346,7 +1346,7 @@ void f2fs_build_gc_manager(struct f2fs_sb_info *sbi)
sbi->gc_pin_file_threshold = DEF_GC_FAILED_PINNED_FILES;
/* give warm/cold data area from slower device */
if (sbi->s_ndevs && !__is_large_section(sbi))
if (f2fs_is_multi_device(sbi) && !__is_large_section(sbi))
SIT_I(sbi)->last_victim[ALLOC_NEXT] =
GET_SEGNO(sbi, FDEV(0).end_blk) + 1;
}

13
fs/f2fs/segment.c
View File

@ -580,7 +580,7 @@ static int submit_flush_wait(struct f2fs_sb_info *sbi, nid_t ino)
int ret = 0;
int i;
if (!sbi->s_ndevs)
if (!f2fs_is_multi_device(sbi))
return __submit_flush_wait(sbi, sbi->sb->s_bdev);
for (i = 0; i < sbi->s_ndevs; i++) {
@ -648,7 +648,8 @@ int f2fs_issue_flush(struct f2fs_sb_info *sbi, nid_t ino)
return ret;
}
if (atomic_inc_return(&fcc->queued_flush) == 1 || sbi->s_ndevs > 1) {
if (atomic_inc_return(&fcc->queued_flush) == 1 ||
f2fs_is_multi_device(sbi)) {
ret = submit_flush_wait(sbi, ino);
atomic_dec(&fcc->queued_flush);
@ -754,7 +755,7 @@ int f2fs_flush_device_cache(struct f2fs_sb_info *sbi)
{
int ret = 0, i;
if (!sbi->s_ndevs)
if (!f2fs_is_multi_device(sbi))
return 0;
for (i = 1; i < sbi->s_ndevs; i++) {
@ -1369,7 +1370,7 @@ static int __queue_discard_cmd(struct f2fs_sb_info *sbi,
trace_f2fs_queue_discard(bdev, blkstart, blklen);
if (sbi->s_ndevs) {
if (f2fs_is_multi_device(sbi)) {
int devi = f2fs_target_device_index(sbi, blkstart);
blkstart -= FDEV(devi).start_blk;
@ -1732,7 +1733,7 @@ static int __f2fs_issue_discard_zone(struct f2fs_sb_info *sbi,
block_t lblkstart = blkstart;
int devi = 0;
if (sbi->s_ndevs) {
if (f2fs_is_multi_device(sbi)) {
devi = f2fs_target_device_index(sbi, blkstart);
blkstart -= FDEV(devi).start_blk;
}
@ -3089,7 +3090,7 @@ static void update_device_state(struct f2fs_io_info *fio)
struct f2fs_sb_info *sbi = fio->sbi;
unsigned int devidx;
if (!sbi->s_ndevs)
if (!f2fs_is_multi_device(sbi))
return;
devidx = f2fs_target_device_index(sbi, fio->new_blkaddr);