* [PATCH v2] f2fs: allow out-place-update for direct IO in LFS mode
@ 2018-09-20 8:57 Chao Yu
2018-09-20 11:25 ` [f2fs-dev] " Sahitya Tummala
0 siblings, 1 reply; 3+ messages in thread
From: Chao Yu @ 2018-09-20 8:57 UTC (permalink / raw)
To: jaegeuk; +Cc: linux-f2fs-devel, linux-kernel, chao, Chao Yu
Normally, DIO uses in-pllace-update, but in LFS mode, f2fs doesn't
allow triggering any in-place-update writes, so we fallback direct
write to buffered write, result in bad performance of large size
write.
This patch adds to support triggering out-place-update for direct IO
to enhance its performance.
Note that it needs to exclude direct read IO during direct write,
since new data writing to new block address will no be valid until
write finished.
storage: zram
time xfs_io -f -d /mnt/f2fs/file -c "pwrite 0 1073741824" -c "fsync"
Before:
real 0m13.061s
user 0m0.327s
sys 0m12.486s
After:
real 0m6.448s
user 0m0.228s
sys 0m6.212s
Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
v2:
- don't use direct IO for block zoned device.
fs/f2fs/data.c | 41 +++++++++++++++++++++++++++++++++--------
fs/f2fs/f2fs.h | 45 +++++++++++++++++++++++++++++++++++++++++----
fs/f2fs/file.c | 3 ++-
3 files changed, 76 insertions(+), 13 deletions(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index b96f8588d565..e709f0fbb7a8 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -894,7 +894,7 @@ static int __allocate_data_block(struct dnode_of_data *dn, int seg_type)
dn->data_blkaddr = datablock_addr(dn->inode,
dn->node_page, dn->ofs_in_node);
- if (dn->data_blkaddr == NEW_ADDR)
+ if (dn->data_blkaddr != NULL_ADDR)
goto alloc;
if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
@@ -950,7 +950,7 @@ int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
if (direct_io) {
map.m_seg_type = f2fs_rw_hint_to_seg_type(iocb->ki_hint);
- flag = f2fs_force_buffered_io(inode, WRITE) ?
+ flag = f2fs_force_buffered_io(inode, iocb, from) ?
F2FS_GET_BLOCK_PRE_AIO :
F2FS_GET_BLOCK_PRE_DIO;
goto map_blocks;
@@ -1069,7 +1069,15 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
goto sync_out;
}
- if (!is_valid_data_blkaddr(sbi, blkaddr)) {
+ if (is_valid_data_blkaddr(sbi, blkaddr)) {
+ /* use out-place-update for driect IO under LFS mode */
+ if (test_opt(sbi, LFS) && create &&
+ flag == F2FS_GET_BLOCK_DEFAULT) {
+ err = __allocate_data_block(&dn, map->m_seg_type);
+ if (!err)
+ set_inode_flag(inode, FI_APPEND_WRITE);
+ }
+ } else {
if (create) {
if (unlikely(f2fs_cp_error(sbi))) {
err = -EIO;
@@ -2493,36 +2501,53 @@ static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
struct address_space *mapping = iocb->ki_filp->f_mapping;
struct inode *inode = mapping->host;
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ struct f2fs_inode_info *fi = F2FS_I(inode);
size_t count = iov_iter_count(iter);
loff_t offset = iocb->ki_pos;
int rw = iov_iter_rw(iter);
int err;
enum rw_hint hint = iocb->ki_hint;
int whint_mode = F2FS_OPTION(sbi).whint_mode;
+ bool lock_read;
err = check_direct_IO(inode, iter, offset);
if (err)
return err < 0 ? err : 0;
- if (f2fs_force_buffered_io(inode, rw))
+ if (f2fs_force_buffered_io(inode, iocb, iter))
return 0;
+ lock_read = allow_outplace_dio(inode, iocb, iter);
+
trace_f2fs_direct_IO_enter(inode, offset, count, rw);
if (rw == WRITE && whint_mode == WHINT_MODE_OFF)
iocb->ki_hint = WRITE_LIFE_NOT_SET;
- if (!down_read_trylock(&F2FS_I(inode)->i_gc_rwsem[rw])) {
- if (iocb->ki_flags & IOCB_NOWAIT) {
+ if (iocb->ki_flags & IOCB_NOWAIT) {
+ if (!down_read_trylock(&fi->i_gc_rwsem[rw])) {
+ iocb->ki_hint = hint;
+ err = -EAGAIN;
+ goto out;
+ }
+ if (lock_read && !down_read_trylock(&fi->i_gc_rwsem[READ])) {
+ up_read(&fi->i_gc_rwsem[rw]);
iocb->ki_hint = hint;
err = -EAGAIN;
goto out;
}
- down_read(&F2FS_I(inode)->i_gc_rwsem[rw]);
+ } else {
+ down_read(&fi->i_gc_rwsem[rw]);
+ if (lock_read)
+ down_read(&fi->i_gc_rwsem[READ]);
}
err = blockdev_direct_IO(iocb, inode, iter, get_data_block_dio);
- up_read(&F2FS_I(inode)->i_gc_rwsem[rw]);
+
+ if (lock_read)
+ up_read(&fi->i_gc_rwsem[READ]);
+
+ up_read(&fi->i_gc_rwsem[rw]);
if (rw == WRITE) {
if (whint_mode == WHINT_MODE_OFF)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 63fffd5b105d..39d0b15f2816 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -8,6 +8,7 @@
#ifndef _LINUX_F2FS_H
#define _LINUX_F2FS_H
+#include <linux/uio.h>
#include <linux/types.h>
#include <linux/page-flags.h>
#include <linux/buffer_head.h>
@@ -3461,11 +3462,47 @@ static inline bool f2fs_may_encrypt(struct inode *inode)
#endif
}
-static inline bool f2fs_force_buffered_io(struct inode *inode, int rw)
+static inline int block_unaligned_IO(struct inode *inode,
+ struct kiocb *iocb, struct iov_iter *iter)
{
- return (f2fs_post_read_required(inode) ||
- (rw == WRITE && test_opt(F2FS_I_SB(inode), LFS)) ||
- F2FS_I_SB(inode)->s_ndevs);
+ unsigned int i_blkbits = READ_ONCE(inode->i_blkbits);
+ unsigned int blocksize_mask = (1 << i_blkbits) - 1;
+ loff_t offset = iocb->ki_pos;
+ unsigned long align = offset | iov_iter_alignment(iter);
+
+ return align & blocksize_mask;
+}
+
+static inline int allow_outplace_dio(struct inode *inode,
+ struct kiocb *iocb, struct iov_iter *iter)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ int rw = iov_iter_rw(iter);
+
+ return (test_opt(sbi, LFS) && (rw == WRITE) &&
+ !block_unaligned_IO(inode, iocb, iter));
+}
+
+static inline bool f2fs_force_buffered_io(struct inode *inode,
+ struct kiocb *iocb, struct iov_iter *iter)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ int rw = iov_iter_rw(iter);
+
+ if (f2fs_post_read_required(inode))
+ return true;
+ if (sbi->s_ndevs)
+ return true;
+ /*
+ * for blkzoned device, fallback direct IO to buffered IO, so
+ * all IOs can be serialized by log-structured write.
+ */
+ if (f2fs_sb_has_blkzoned(sbi))
+ return true;
+ if (test_opt(sbi, LFS) && (rw == WRITE) &&
+ block_unaligned_IO(inode, iocb, iter))
+ return true;
+ return false;
}
#ifdef CONFIG_F2FS_FAULT_INJECTION
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 428e7398bd89..70491631e040 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3018,7 +3018,8 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (!f2fs_overwrite_io(inode, iocb->ki_pos,
iov_iter_count(from)) ||
f2fs_has_inline_data(inode) ||
- f2fs_force_buffered_io(inode, WRITE)) {
+ f2fs_force_buffered_io(inode,
+ iocb, from)) {
clear_inode_flag(inode,
FI_NO_PREALLOC);
inode_unlock(inode);
--
2.18.0.rc1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [f2fs-dev] [PATCH v2] f2fs: allow out-place-update for direct IO in LFS mode
2018-09-20 8:57 [PATCH v2] f2fs: allow out-place-update for direct IO in LFS mode Chao Yu
@ 2018-09-20 11:25 ` Sahitya Tummala
2018-09-20 12:16 ` Chao Yu
0 siblings, 1 reply; 3+ messages in thread
From: Sahitya Tummala @ 2018-09-20 11:25 UTC (permalink / raw)
To: Chao Yu; +Cc: jaegeuk, linux-kernel, linux-f2fs-devel
On Thu, Sep 20, 2018 at 04:57:18PM +0800, Chao Yu wrote:
> Normally, DIO uses in-pllace-update, but in LFS mode, f2fs doesn't
> allow triggering any in-place-update writes, so we fallback direct
> write to buffered write, result in bad performance of large size
> write.
>
> This patch adds to support triggering out-place-update for direct IO
> to enhance its performance.
>
> Note that it needs to exclude direct read IO during direct write,
> since new data writing to new block address will no be valid until
> write finished.
>
> storage: zram
>
> time xfs_io -f -d /mnt/f2fs/file -c "pwrite 0 1073741824" -c "fsync"
>
> Before:
> real 0m13.061s
> user 0m0.327s
> sys 0m12.486s
>
> After:
> real 0m6.448s
> user 0m0.228s
> sys 0m6.212s
>
> Signed-off-by: Chao Yu <yuchao0@huawei.com>
> ---
> v2:
> - don't use direct IO for block zoned device.
> fs/f2fs/data.c | 41 +++++++++++++++++++++++++++++++++--------
> fs/f2fs/f2fs.h | 45 +++++++++++++++++++++++++++++++++++++++++----
> fs/f2fs/file.c | 3 ++-
> 3 files changed, 76 insertions(+), 13 deletions(-)
>
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index b96f8588d565..e709f0fbb7a8 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -894,7 +894,7 @@ static int __allocate_data_block(struct dnode_of_data *dn, int seg_type)
>
> dn->data_blkaddr = datablock_addr(dn->inode,
> dn->node_page, dn->ofs_in_node);
> - if (dn->data_blkaddr == NEW_ADDR)
> + if (dn->data_blkaddr != NULL_ADDR)
> goto alloc;
>
> if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
> @@ -950,7 +950,7 @@ int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
>
> if (direct_io) {
> map.m_seg_type = f2fs_rw_hint_to_seg_type(iocb->ki_hint);
> - flag = f2fs_force_buffered_io(inode, WRITE) ?
> + flag = f2fs_force_buffered_io(inode, iocb, from) ?
> F2FS_GET_BLOCK_PRE_AIO :
> F2FS_GET_BLOCK_PRE_DIO;
> goto map_blocks;
> @@ -1069,7 +1069,15 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
> goto sync_out;
> }
>
> - if (!is_valid_data_blkaddr(sbi, blkaddr)) {
> + if (is_valid_data_blkaddr(sbi, blkaddr)) {
> + /* use out-place-update for driect IO under LFS mode */
> + if (test_opt(sbi, LFS) && create &&
> + flag == F2FS_GET_BLOCK_DEFAULT) {
> + err = __allocate_data_block(&dn, map->m_seg_type);
> + if (!err)
> + set_inode_flag(inode, FI_APPEND_WRITE);
> + }
> + } else {
> if (create) {
> if (unlikely(f2fs_cp_error(sbi))) {
> err = -EIO;
> @@ -2493,36 +2501,53 @@ static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
> struct address_space *mapping = iocb->ki_filp->f_mapping;
> struct inode *inode = mapping->host;
> struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> + struct f2fs_inode_info *fi = F2FS_I(inode);
> size_t count = iov_iter_count(iter);
> loff_t offset = iocb->ki_pos;
> int rw = iov_iter_rw(iter);
> int err;
> enum rw_hint hint = iocb->ki_hint;
> int whint_mode = F2FS_OPTION(sbi).whint_mode;
> + bool lock_read;
>
> err = check_direct_IO(inode, iter, offset);
> if (err)
> return err < 0 ? err : 0;
>
> - if (f2fs_force_buffered_io(inode, rw))
> + if (f2fs_force_buffered_io(inode, iocb, iter))
> return 0;
>
> + lock_read = allow_outplace_dio(inode, iocb, iter);
> +
> trace_f2fs_direct_IO_enter(inode, offset, count, rw);
>
> if (rw == WRITE && whint_mode == WHINT_MODE_OFF)
> iocb->ki_hint = WRITE_LIFE_NOT_SET;
>
> - if (!down_read_trylock(&F2FS_I(inode)->i_gc_rwsem[rw])) {
> - if (iocb->ki_flags & IOCB_NOWAIT) {
> + if (iocb->ki_flags & IOCB_NOWAIT) {
> + if (!down_read_trylock(&fi->i_gc_rwsem[rw])) {
> + iocb->ki_hint = hint;
> + err = -EAGAIN;
> + goto out;
> + }
> + if (lock_read && !down_read_trylock(&fi->i_gc_rwsem[READ])) {
> + up_read(&fi->i_gc_rwsem[rw]);
> iocb->ki_hint = hint;
> err = -EAGAIN;
> goto out;
> }
> - down_read(&F2FS_I(inode)->i_gc_rwsem[rw]);
> + } else {
> + down_read(&fi->i_gc_rwsem[rw]);
> + if (lock_read)
> + down_read(&fi->i_gc_rwsem[READ]);
> }
>
> err = blockdev_direct_IO(iocb, inode, iter, get_data_block_dio);
> - up_read(&F2FS_I(inode)->i_gc_rwsem[rw]);
> +
> + if (lock_read)
> + up_read(&fi->i_gc_rwsem[READ]);
> +
> + up_read(&fi->i_gc_rwsem[rw]);
>
> if (rw == WRITE) {
The current code is setting the FI_UPDATE_WRITE inode flag in the success case
in this if block. I think it needs to be removed as it is over-writing the
the flag FI_APPEND_WRITE that this patch now sets in f2fs_map_blocks() and it
now supports out-of-place updates.
> if (whint_mode == WHINT_MODE_OFF)
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 63fffd5b105d..39d0b15f2816 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -8,6 +8,7 @@
> #ifndef _LINUX_F2FS_H
> #define _LINUX_F2FS_H
>
> +#include <linux/uio.h>
> #include <linux/types.h>
> #include <linux/page-flags.h>
> #include <linux/buffer_head.h>
> @@ -3461,11 +3462,47 @@ static inline bool f2fs_may_encrypt(struct inode *inode)
> #endif
> }
>
> -static inline bool f2fs_force_buffered_io(struct inode *inode, int rw)
> +static inline int block_unaligned_IO(struct inode *inode,
> + struct kiocb *iocb, struct iov_iter *iter)
> {
> - return (f2fs_post_read_required(inode) ||
> - (rw == WRITE && test_opt(F2FS_I_SB(inode), LFS)) ||
> - F2FS_I_SB(inode)->s_ndevs);
> + unsigned int i_blkbits = READ_ONCE(inode->i_blkbits);
> + unsigned int blocksize_mask = (1 << i_blkbits) - 1;
> + loff_t offset = iocb->ki_pos;
> + unsigned long align = offset | iov_iter_alignment(iter);
> +
> + return align & blocksize_mask;
> +}
> +
> +static inline int allow_outplace_dio(struct inode *inode,
> + struct kiocb *iocb, struct iov_iter *iter)
> +{
> + struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> + int rw = iov_iter_rw(iter);
> +
> + return (test_opt(sbi, LFS) && (rw == WRITE) &&
> + !block_unaligned_IO(inode, iocb, iter));
> +}
> +
> +static inline bool f2fs_force_buffered_io(struct inode *inode,
> + struct kiocb *iocb, struct iov_iter *iter)
> +{
> + struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> + int rw = iov_iter_rw(iter);
> +
> + if (f2fs_post_read_required(inode))
> + return true;
> + if (sbi->s_ndevs)
> + return true;
> + /*
> + * for blkzoned device, fallback direct IO to buffered IO, so
> + * all IOs can be serialized by log-structured write.
> + */
> + if (f2fs_sb_has_blkzoned(sbi))
> + return true;
> + if (test_opt(sbi, LFS) && (rw == WRITE) &&
> + block_unaligned_IO(inode, iocb, iter))
> + return true;
> + return false;
> }
>
> #ifdef CONFIG_F2FS_FAULT_INJECTION
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 428e7398bd89..70491631e040 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -3018,7 +3018,8 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
> if (!f2fs_overwrite_io(inode, iocb->ki_pos,
> iov_iter_count(from)) ||
> f2fs_has_inline_data(inode) ||
> - f2fs_force_buffered_io(inode, WRITE)) {
> + f2fs_force_buffered_io(inode,
> + iocb, from)) {
> clear_inode_flag(inode,
> FI_NO_PREALLOC);
> inode_unlock(inode);
> --
> 2.18.0.rc1
>
>
>
> _______________________________________________
> Linux-f2fs-devel mailing list
> Linux-f2fs-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
--
--
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [f2fs-dev] [PATCH v2] f2fs: allow out-place-update for direct IO in LFS mode
2018-09-20 11:25 ` [f2fs-dev] " Sahitya Tummala
@ 2018-09-20 12:16 ` Chao Yu
0 siblings, 0 replies; 3+ messages in thread
From: Chao Yu @ 2018-09-20 12:16 UTC (permalink / raw)
To: Sahitya Tummala, Chao Yu; +Cc: jaegeuk, linux-kernel, linux-f2fs-devel
On 2018/9/20 19:25, Sahitya Tummala wrote:
> On Thu, Sep 20, 2018 at 04:57:18PM +0800, Chao Yu wrote:
>> Normally, DIO uses in-pllace-update, but in LFS mode, f2fs doesn't
>> allow triggering any in-place-update writes, so we fallback direct
>> write to buffered write, result in bad performance of large size
>> write.
>>
>> This patch adds to support triggering out-place-update for direct IO
>> to enhance its performance.
>>
>> Note that it needs to exclude direct read IO during direct write,
>> since new data writing to new block address will no be valid until
>> write finished.
>>
>> storage: zram
>>
>> time xfs_io -f -d /mnt/f2fs/file -c "pwrite 0 1073741824" -c "fsync"
>>
>> Before:
>> real 0m13.061s
>> user 0m0.327s
>> sys 0m12.486s
>>
>> After:
>> real 0m6.448s
>> user 0m0.228s
>> sys 0m6.212s
>>
>> Signed-off-by: Chao Yu <yuchao0@huawei.com>
>> ---
>> v2:
>> - don't use direct IO for block zoned device.
>> fs/f2fs/data.c | 41 +++++++++++++++++++++++++++++++++--------
>> fs/f2fs/f2fs.h | 45 +++++++++++++++++++++++++++++++++++++++++----
>> fs/f2fs/file.c | 3 ++-
>> 3 files changed, 76 insertions(+), 13 deletions(-)
>>
>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>> index b96f8588d565..e709f0fbb7a8 100644
>> --- a/fs/f2fs/data.c
>> +++ b/fs/f2fs/data.c
>> @@ -894,7 +894,7 @@ static int __allocate_data_block(struct dnode_of_data *dn, int seg_type)
>>
>> dn->data_blkaddr = datablock_addr(dn->inode,
>> dn->node_page, dn->ofs_in_node);
>> - if (dn->data_blkaddr == NEW_ADDR)
>> + if (dn->data_blkaddr != NULL_ADDR)
>> goto alloc;
>>
>> if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
>> @@ -950,7 +950,7 @@ int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
>>
>> if (direct_io) {
>> map.m_seg_type = f2fs_rw_hint_to_seg_type(iocb->ki_hint);
>> - flag = f2fs_force_buffered_io(inode, WRITE) ?
>> + flag = f2fs_force_buffered_io(inode, iocb, from) ?
>> F2FS_GET_BLOCK_PRE_AIO :
>> F2FS_GET_BLOCK_PRE_DIO;
>> goto map_blocks;
>> @@ -1069,7 +1069,15 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
>> goto sync_out;
>> }
>>
>> - if (!is_valid_data_blkaddr(sbi, blkaddr)) {
>> + if (is_valid_data_blkaddr(sbi, blkaddr)) {
>> + /* use out-place-update for driect IO under LFS mode */
>> + if (test_opt(sbi, LFS) && create &&
>> + flag == F2FS_GET_BLOCK_DEFAULT) {
>> + err = __allocate_data_block(&dn, map->m_seg_type);
>> + if (!err)
>> + set_inode_flag(inode, FI_APPEND_WRITE);
>> + }
>> + } else {
>> if (create) {
>> if (unlikely(f2fs_cp_error(sbi))) {
>> err = -EIO;
>> @@ -2493,36 +2501,53 @@ static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
>> struct address_space *mapping = iocb->ki_filp->f_mapping;
>> struct inode *inode = mapping->host;
>> struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>> + struct f2fs_inode_info *fi = F2FS_I(inode);
>> size_t count = iov_iter_count(iter);
>> loff_t offset = iocb->ki_pos;
>> int rw = iov_iter_rw(iter);
>> int err;
>> enum rw_hint hint = iocb->ki_hint;
>> int whint_mode = F2FS_OPTION(sbi).whint_mode;
>> + bool lock_read;
>>
>> err = check_direct_IO(inode, iter, offset);
>> if (err)
>> return err < 0 ? err : 0;
>>
>> - if (f2fs_force_buffered_io(inode, rw))
>> + if (f2fs_force_buffered_io(inode, iocb, iter))
>> return 0;
>>
>> + lock_read = allow_outplace_dio(inode, iocb, iter);
>> +
>> trace_f2fs_direct_IO_enter(inode, offset, count, rw);
>>
>> if (rw == WRITE && whint_mode == WHINT_MODE_OFF)
>> iocb->ki_hint = WRITE_LIFE_NOT_SET;
>>
>> - if (!down_read_trylock(&F2FS_I(inode)->i_gc_rwsem[rw])) {
>> - if (iocb->ki_flags & IOCB_NOWAIT) {
>> + if (iocb->ki_flags & IOCB_NOWAIT) {
>> + if (!down_read_trylock(&fi->i_gc_rwsem[rw])) {
>> + iocb->ki_hint = hint;
>> + err = -EAGAIN;
>> + goto out;
>> + }
>> + if (lock_read && !down_read_trylock(&fi->i_gc_rwsem[READ])) {
>> + up_read(&fi->i_gc_rwsem[rw]);
>> iocb->ki_hint = hint;
>> err = -EAGAIN;
>> goto out;
>> }
>> - down_read(&F2FS_I(inode)->i_gc_rwsem[rw]);
>> + } else {
>> + down_read(&fi->i_gc_rwsem[rw]);
>> + if (lock_read)
>> + down_read(&fi->i_gc_rwsem[READ]);
>> }
>>
>> err = blockdev_direct_IO(iocb, inode, iter, get_data_block_dio);
>> - up_read(&F2FS_I(inode)->i_gc_rwsem[rw]);
>> +
>> + if (lock_read)
>> + up_read(&fi->i_gc_rwsem[READ]);
>> +
>> + up_read(&fi->i_gc_rwsem[rw]);
>>
>> if (rw == WRITE) {
>
> The current code is setting the FI_UPDATE_WRITE inode flag in the success case
> in this if block. I think it needs to be removed as it is over-writing the
> the flag FI_APPEND_WRITE that this patch now sets in f2fs_map_blocks() and it
> now supports out-of-place updates.
Agreed, let me fix this in v3, thanks for catching this.
Thanks,
>
>> if (whint_mode == WHINT_MODE_OFF)
>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>> index 63fffd5b105d..39d0b15f2816 100644
>> --- a/fs/f2fs/f2fs.h
>> +++ b/fs/f2fs/f2fs.h
>> @@ -8,6 +8,7 @@
>> #ifndef _LINUX_F2FS_H
>> #define _LINUX_F2FS_H
>>
>> +#include <linux/uio.h>
>> #include <linux/types.h>
>> #include <linux/page-flags.h>
>> #include <linux/buffer_head.h>
>> @@ -3461,11 +3462,47 @@ static inline bool f2fs_may_encrypt(struct inode *inode)
>> #endif
>> }
>>
>> -static inline bool f2fs_force_buffered_io(struct inode *inode, int rw)
>> +static inline int block_unaligned_IO(struct inode *inode,
>> + struct kiocb *iocb, struct iov_iter *iter)
>> {
>> - return (f2fs_post_read_required(inode) ||
>> - (rw == WRITE && test_opt(F2FS_I_SB(inode), LFS)) ||
>> - F2FS_I_SB(inode)->s_ndevs);
>> + unsigned int i_blkbits = READ_ONCE(inode->i_blkbits);
>> + unsigned int blocksize_mask = (1 << i_blkbits) - 1;
>> + loff_t offset = iocb->ki_pos;
>> + unsigned long align = offset | iov_iter_alignment(iter);
>> +
>> + return align & blocksize_mask;
>> +}
>> +
>> +static inline int allow_outplace_dio(struct inode *inode,
>> + struct kiocb *iocb, struct iov_iter *iter)
>> +{
>> + struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>> + int rw = iov_iter_rw(iter);
>> +
>> + return (test_opt(sbi, LFS) && (rw == WRITE) &&
>> + !block_unaligned_IO(inode, iocb, iter));
>> +}
>> +
>> +static inline bool f2fs_force_buffered_io(struct inode *inode,
>> + struct kiocb *iocb, struct iov_iter *iter)
>> +{
>> + struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>> + int rw = iov_iter_rw(iter);
>> +
>> + if (f2fs_post_read_required(inode))
>> + return true;
>> + if (sbi->s_ndevs)
>> + return true;
>> + /*
>> + * for blkzoned device, fallback direct IO to buffered IO, so
>> + * all IOs can be serialized by log-structured write.
>> + */
>> + if (f2fs_sb_has_blkzoned(sbi))
>> + return true;
>> + if (test_opt(sbi, LFS) && (rw == WRITE) &&
>> + block_unaligned_IO(inode, iocb, iter))
>> + return true;
>> + return false;
>> }
>>
>> #ifdef CONFIG_F2FS_FAULT_INJECTION
>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
>> index 428e7398bd89..70491631e040 100644
>> --- a/fs/f2fs/file.c
>> +++ b/fs/f2fs/file.c
>> @@ -3018,7 +3018,8 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
>> if (!f2fs_overwrite_io(inode, iocb->ki_pos,
>> iov_iter_count(from)) ||
>> f2fs_has_inline_data(inode) ||
>> - f2fs_force_buffered_io(inode, WRITE)) {
>> + f2fs_force_buffered_io(inode,
>> + iocb, from)) {
>> clear_inode_flag(inode,
>> FI_NO_PREALLOC);
>> inode_unlock(inode);
>> --
>> 2.18.0.rc1
>>
>>
>>
>> _______________________________________________
>> Linux-f2fs-devel mailing list
>> Linux-f2fs-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-09-20 12:17 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-09-20 8:57 [PATCH v2] f2fs: allow out-place-update for direct IO in LFS mode Chao Yu
2018-09-20 11:25 ` [f2fs-dev] " Sahitya Tummala
2018-09-20 12:16 ` Chao Yu
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