Messages in this thread | | | Subject | Re: [PATCH v2] f2fs: separate NOCoW and pinfile semantics | From | Chao Yu <> | Date | Mon, 29 Jul 2019 15:20:37 +0800 |
| |
On 2019/7/29 13:57, Jaegeuk Kim wrote: > On 07/23, Chao Yu wrote: >> On 2019/7/23 10:36, Jaegeuk Kim wrote: >>> On 07/19, Chao Yu wrote: >>>> Pinning a file is heavy, because skipping pinned files make GC >>>> running with heavy load or no effect. >>> >>> Pinned file is a part of NOCOW files, so I don't think we can simply drop it >>> for backward compatibility. >> >> Yes, >> >> But what I concerned is that pin file is too heavy, so in order to satisfy below >> demand, how about introducing pin_file_2 flag to triggering IPU only during >> flush/writeback. > > That can be done by cold files?
Then it may inherit property of cold type file, e.g. a) goes into cold area; b) update with very low frequency.
Actually pin_file_2 could be used by db-wal/log file, which are updated frequently, and should go to hot/warm area, it does not match above two property.
Thank,
> >> >>> >>>> >>>> So that this patch propose to separate nocow and pinfile semantics: >>>> - NOCoW flag can only be set on regular file. >>>> - NOCoW file will only trigger IPU at common writeback/flush. >>>> - NOCow file will do OPU during GC. >>>> >>>> For the demand of 1) avoid fragment of file's physical block and >>>> 2) userspace don't care about file's specific physical address, >>>> tagging file as NOCoW will be cheaper than pinned one. >> >> ^^^ >> >> Thanks, >> >>>> >>>> Signed-off-by: Chao Yu <yuchao0@huawei.com> >>>> --- >>>> v2: >>>> - rebase code to fix compile error. >>>> fs/f2fs/data.c | 3 ++- >>>> fs/f2fs/f2fs.h | 1 + >>>> fs/f2fs/file.c | 22 +++++++++++++++++++--- >>>> 3 files changed, 22 insertions(+), 4 deletions(-) >>>> >>>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c >>>> index a2a28bb269bf..15fb8954c363 100644 >>>> --- a/fs/f2fs/data.c >>>> +++ b/fs/f2fs/data.c >>>> @@ -1884,7 +1884,8 @@ static inline bool check_inplace_update_policy(struct inode *inode, >>>> >>>> bool f2fs_should_update_inplace(struct inode *inode, struct f2fs_io_info *fio) >>>> { >>>> - if (f2fs_is_pinned_file(inode)) >>>> + if (f2fs_is_pinned_file(inode) || >>>> + F2FS_I(inode)->i_flags & F2FS_NOCOW_FL) >>>> return true; >>>> >>>> /* if this is cold file, we should overwrite to avoid fragmentation */ >>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h >>>> index 596ab3e1dd7b..f6c5a3d2e659 100644 >>>> --- a/fs/f2fs/f2fs.h >>>> +++ b/fs/f2fs/f2fs.h >>>> @@ -2374,6 +2374,7 @@ static inline void f2fs_change_bit(unsigned int nr, char *addr) >>>> #define F2FS_NOATIME_FL 0x00000080 /* do not update atime */ >>>> #define F2FS_INDEX_FL 0x00001000 /* hash-indexed directory */ >>>> #define F2FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ >>>> +#define F2FS_NOCOW_FL 0x00800000 /* Do not cow file */ >>>> #define F2FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ >>>> >>>> /* Flags that should be inherited by new inodes from their parent. */ >>>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c >>>> index 7ca545874060..ae0fec54cac6 100644 >>>> --- a/fs/f2fs/file.c >>>> +++ b/fs/f2fs/file.c >>>> @@ -1692,6 +1692,7 @@ static const struct { >>>> { F2FS_NOATIME_FL, FS_NOATIME_FL }, >>>> { F2FS_INDEX_FL, FS_INDEX_FL }, >>>> { F2FS_DIRSYNC_FL, FS_DIRSYNC_FL }, >>>> + { F2FS_NOCOW_FL, FS_NOCOW_FL }, >>>> { F2FS_PROJINHERIT_FL, FS_PROJINHERIT_FL }, >>>> }; >>>> >>>> @@ -1715,7 +1716,8 @@ static const struct { >>>> FS_NODUMP_FL | \ >>>> FS_NOATIME_FL | \ >>>> FS_DIRSYNC_FL | \ >>>> - FS_PROJINHERIT_FL) >>>> + FS_PROJINHERIT_FL | \ >>>> + FS_NOCOW_FL) >>>> >>>> /* Convert f2fs on-disk i_flags to FS_IOC_{GET,SET}FLAGS flags */ >>>> static inline u32 f2fs_iflags_to_fsflags(u32 iflags) >>>> @@ -1753,8 +1755,6 @@ static int f2fs_ioc_getflags(struct file *filp, unsigned long arg) >>>> fsflags |= FS_ENCRYPT_FL; >>>> if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode)) >>>> fsflags |= FS_INLINE_DATA_FL; >>>> - if (is_inode_flag_set(inode, FI_PIN_FILE)) >>>> - fsflags |= FS_NOCOW_FL; >>>> >>>> fsflags &= F2FS_GETTABLE_FS_FL; >>>> >>>> @@ -1794,6 +1794,22 @@ static int f2fs_ioc_setflags(struct file *filp, unsigned long arg) >>>> if (ret) >>>> goto out; >>>> >>>> + if ((fsflags ^ old_fsflags) & FS_NOCOW_FL) { >>>> + if (!S_ISREG(inode->i_mode)) { >>>> + ret = -EINVAL; >>>> + goto out; >>>> + } >>>> + >>>> + if (f2fs_should_update_outplace(inode, NULL)) { >>>> + ret = -EINVAL; >>>> + goto out; >>>> + } >>>> + >>>> + ret = f2fs_convert_inline_inode(inode); >>>> + if (ret) >>>> + goto out; >>>> + } >>>> + >>>> ret = f2fs_setflags_common(inode, iflags, >>>> f2fs_fsflags_to_iflags(F2FS_SETTABLE_FS_FL)); >>>> out: >>>> -- >>>> 2.18.0.rc1 >>> . >>> > . >
| |