| Message ID | 9e9521a4-6e07-e226-2814-b78a2451656b@fujitsu.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [v7] mm, pmem, xfs: Introduce MF_MEM_REMOVE for unbind | expand |
Shiyang Ruan wrote: > This patch is inspired by Dan's "mm, dax, pmem: Introduce > dev_pagemap_failure()"[1]. With the help of dax_holder and > ->notify_failure() mechanism, the pmem driver is able to ask filesystem > (or mapped device) on it to unmap all files in use and notify processes > who are using those files. > > Call trace: > trigger unbind > -> unbind_store() > -> ... (skip) > -> devres_release_all() > -> kill_dax() > -> dax_holder_notify_failure(dax_dev, 0, U64_MAX, MF_MEM_PRE_REMOVE) > -> xfs_dax_notify_failure() > > Introduce MF_MEM_PRE_REMOVE to let filesystem know this is a remove > event. So do not shutdown filesystem directly if something not > supported, or if failure range includes metadata area. Make sure all > files and processes are handled correctly. > > == > Changes since v6: > 1. Rebase on 6.0-rc2 and Darrick's patch[2]. > > Changes since v5: > 1. Renamed MF_MEM_REMOVE to MF_MEM_PRE_REMOVE > 2. hold s_umount before sync_filesystem() > 3. do sync_filesystem() after SB_BORN check > 4. Rebased on next-20220714 > > [1]: > https://lore.kernel.org/linux-mm/161604050314.1463742.14151665140035795571.stgit@dwillia2-desk3.amr.corp.intel.com/ > [2]: https://lore.kernel.org/linux-xfs/Yv5wIa2crHioYeRr@magnolia/ > > Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com> > Reviewed-by: Darrick J. Wong <djwong@kernel.org> > --- > drivers/dax/super.c | 3 ++- > fs/xfs/xfs_notify_failure.c | 15 +++++++++++++++ > include/linux/mm.h | 1 + > 3 files changed, 18 insertions(+), 1 deletion(-) > > diff --git a/drivers/dax/super.c b/drivers/dax/super.c > index 9b5e2a5eb0ae..cf9a64563fbe 100644 > --- a/drivers/dax/super.c > +++ b/drivers/dax/super.c > @@ -323,7 +323,8 @@ void kill_dax(struct dax_device *dax_dev) > return; > if (dax_dev->holder_data != NULL) > - dax_holder_notify_failure(dax_dev, 0, U64_MAX, 0); > + dax_holder_notify_failure(dax_dev, 0, U64_MAX, > + MF_MEM_PRE_REMOVE); > clear_bit(DAXDEV_ALIVE, &dax_dev->flags); > synchronize_srcu(&dax_srcu); > diff --git a/fs/xfs/xfs_notify_failure.c b/fs/xfs/xfs_notify_failure.c > index 65d5eb20878e..a9769f17e998 100644 > --- a/fs/xfs/xfs_notify_failure.c > +++ b/fs/xfs/xfs_notify_failure.c > @@ -77,6 +77,9 @@ xfs_dax_failure_fn( > if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) || > (rec->rm_flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK))) { > + /* Do not shutdown so early when device is to be removed */ > + if (notify->mf_flags & MF_MEM_PRE_REMOVE) > + return 0; > notify->want_shutdown = true; > return 0; > } > @@ -182,12 +185,22 @@ xfs_dax_notify_failure( > struct xfs_mount *mp = dax_holder(dax_dev); > u64 ddev_start; > u64 ddev_end; > + int error; > if (!(mp->m_sb.sb_flags & SB_BORN)) { How are you testing the SB_BORN interactions? I have a fix for this pending here: https://lore.kernel.org/nvdimm/166153428094.2758201.7936572520826540019.stgit@dwillia2-xfh.jf.intel.com/ > xfs_warn(mp, "filesystem is not ready for notify_failure()!"); > return -EIO; > } > + if (mf_flags & MF_MEM_PRE_REMOVE) { It appears this patch is corrupted here. I confirmed that b4 sees the same when trying to apply it. > + xfs_info(mp, "device is about to be removed!"); > + down_write(&mp->m_super->s_umount); > + error = sync_filesystem(mp->m_super); This syncs to make data persistent, but for DAX this also needs to get invalidate all current DAX mappings. I do not see that in these changes. > + up_write(&mp->m_super->s_umount); > + if (error) > + return error; > + } > + > if (mp->m_rtdev_targp && mp->m_rtdev_targp->bt_daxdev == dax_dev) { > xfs_warn(mp, > "notify_failure() not supported on realtime device!"); > @@ -196,6 +209,8 @@ xfs_dax_notify_failure( > if (mp->m_logdev_targp && mp->m_logdev_targp->bt_daxdev == dax_dev && > mp->m_logdev_targp != mp->m_ddev_targp) { > + if (mf_flags & MF_MEM_PRE_REMOVE) > + return 0; > xfs_err(mp, "ondisk log corrupt, shutting down fs!"); > xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_ONDISK); > return -EFSCORRUPTED; > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 982f2607180b..2c7c132e6512 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -3176,6 +3176,7 @@ enum mf_flags { > MF_UNPOISON = 1 << 4, > MF_SW_SIMULATED = 1 << 5, > MF_NO_RETRY = 1 << 6, > + MF_MEM_PRE_REMOVE = 1 << 7, > }; > int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, > unsigned long count, int mf_flags); > -- > 2.37.2 > >
在 2022/8/27 5:35, Dan Williams 写道: > Shiyang Ruan wrote: >> This patch is inspired by Dan's "mm, dax, pmem: Introduce >> dev_pagemap_failure()"[1]. With the help of dax_holder and >> ->notify_failure() mechanism, the pmem driver is able to ask filesystem >> (or mapped device) on it to unmap all files in use and notify processes >> who are using those files. >> >> Call trace: >> trigger unbind >> -> unbind_store() >> -> ... (skip) >> -> devres_release_all() >> -> kill_dax() >> -> dax_holder_notify_failure(dax_dev, 0, U64_MAX, MF_MEM_PRE_REMOVE) >> -> xfs_dax_notify_failure() >> >> Introduce MF_MEM_PRE_REMOVE to let filesystem know this is a remove >> event. So do not shutdown filesystem directly if something not >> supported, or if failure range includes metadata area. Make sure all >> files and processes are handled correctly. >> >> == >> Changes since v6: >> 1. Rebase on 6.0-rc2 and Darrick's patch[2]. >> >> Changes since v5: >> 1. Renamed MF_MEM_REMOVE to MF_MEM_PRE_REMOVE >> 2. hold s_umount before sync_filesystem() >> 3. do sync_filesystem() after SB_BORN check >> 4. Rebased on next-20220714 >> >> [1]: >> https://lore.kernel.org/linux-mm/161604050314.1463742.14151665140035795571.stgit@dwillia2-desk3.amr.corp.intel.com/ >> [2]: https://lore.kernel.org/linux-xfs/Yv5wIa2crHioYeRr@magnolia/ >> >> Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com> >> Reviewed-by: Darrick J. Wong <djwong@kernel.org> >> --- >> drivers/dax/super.c | 3 ++- >> fs/xfs/xfs_notify_failure.c | 15 +++++++++++++++ >> include/linux/mm.h | 1 + >> 3 files changed, 18 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/dax/super.c b/drivers/dax/super.c >> index 9b5e2a5eb0ae..cf9a64563fbe 100644 >> --- a/drivers/dax/super.c >> +++ b/drivers/dax/super.c >> @@ -323,7 +323,8 @@ void kill_dax(struct dax_device *dax_dev) >> return; >> if (dax_dev->holder_data != NULL) >> - dax_holder_notify_failure(dax_dev, 0, U64_MAX, 0); >> + dax_holder_notify_failure(dax_dev, 0, U64_MAX, >> + MF_MEM_PRE_REMOVE); >> clear_bit(DAXDEV_ALIVE, &dax_dev->flags); >> synchronize_srcu(&dax_srcu); >> diff --git a/fs/xfs/xfs_notify_failure.c b/fs/xfs/xfs_notify_failure.c >> index 65d5eb20878e..a9769f17e998 100644 >> --- a/fs/xfs/xfs_notify_failure.c >> +++ b/fs/xfs/xfs_notify_failure.c >> @@ -77,6 +77,9 @@ xfs_dax_failure_fn( >> if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) || >> (rec->rm_flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK))) { >> + /* Do not shutdown so early when device is to be removed */ >> + if (notify->mf_flags & MF_MEM_PRE_REMOVE) >> + return 0; >> notify->want_shutdown = true; >> return 0; >> } >> @@ -182,12 +185,22 @@ xfs_dax_notify_failure( >> struct xfs_mount *mp = dax_holder(dax_dev); >> u64 ddev_start; >> u64 ddev_end; >> + int error; >> if (!(mp->m_sb.sb_flags & SB_BORN)) { > > How are you testing the SB_BORN interactions? I have a fix for this > pending here: > > https://lore.kernel.org/nvdimm/166153428094.2758201.7936572520826540019.stgit@dwillia2-xfh.jf.intel.com/ That was my mistake. Yes, it should be mp->m_super->s_flags. (I remember my testcase did pass in my dev version, but now that seems impossible. I think something was wrong when I did the test.) > >> xfs_warn(mp, "filesystem is not ready for notify_failure()!"); >> return -EIO; >> } >> + if (mf_flags & MF_MEM_PRE_REMOVE) { > > It appears this patch is corrupted here. I confirmed that b4 sees the > same when trying to apply it. Can't this patch be applied? It is based on 6.0-rc2 + Darrick's patch. It's also ok to rebase on 6.0-rc3 + Darrick's patch. > >> + xfs_info(mp, "device is about to be removed!"); >> + down_write(&mp->m_super->s_umount); >> + error = sync_filesystem(mp->m_super); > > This syncs to make data persistent, but for DAX this also needs to get > invalidate all current DAX mappings. I do not see that in these changes. I'll add it. -- Thanks, Ruan. > >> + up_write(&mp->m_super->s_umount); >> + if (error) >> + return error; >> + } >> + >> if (mp->m_rtdev_targp && mp->m_rtdev_targp->bt_daxdev == dax_dev) { >> xfs_warn(mp, >> "notify_failure() not supported on realtime device!"); >> @@ -196,6 +209,8 @@ xfs_dax_notify_failure( >> if (mp->m_logdev_targp && mp->m_logdev_targp->bt_daxdev == dax_dev && >> mp->m_logdev_targp != mp->m_ddev_targp) { >> + if (mf_flags & MF_MEM_PRE_REMOVE) >> + return 0; >> xfs_err(mp, "ondisk log corrupt, shutting down fs!"); >> xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_ONDISK); >> return -EFSCORRUPTED; >> diff --git a/include/linux/mm.h b/include/linux/mm.h >> index 982f2607180b..2c7c132e6512 100644 >> --- a/include/linux/mm.h >> +++ b/include/linux/mm.h >> @@ -3176,6 +3176,7 @@ enum mf_flags { >> MF_UNPOISON = 1 << 4, >> MF_SW_SIMULATED = 1 << 5, >> MF_NO_RETRY = 1 << 6, >> + MF_MEM_PRE_REMOVE = 1 << 7, >> }; >> int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, >> unsigned long count, int mf_flags); >> -- >> 2.37.2 >> >> > >
On Mon, Aug 29, 2022 at 06:02:11PM +0800, Shiyang Ruan wrote: > > > 在 2022/8/27 5:35, Dan Williams 写道: > > Shiyang Ruan wrote: > > > This patch is inspired by Dan's "mm, dax, pmem: Introduce > > > dev_pagemap_failure()"[1]. With the help of dax_holder and > > > ->notify_failure() mechanism, the pmem driver is able to ask filesystem > > > (or mapped device) on it to unmap all files in use and notify processes > > > who are using those files. > > > > > > Call trace: > > > trigger unbind > > > -> unbind_store() > > > -> ... (skip) > > > -> devres_release_all() > > > -> kill_dax() > > > -> dax_holder_notify_failure(dax_dev, 0, U64_MAX, MF_MEM_PRE_REMOVE) > > > -> xfs_dax_notify_failure() > > > > > > Introduce MF_MEM_PRE_REMOVE to let filesystem know this is a remove > > > event. So do not shutdown filesystem directly if something not > > > supported, or if failure range includes metadata area. Make sure all > > > files and processes are handled correctly. > > > > > > == > > > Changes since v6: > > > 1. Rebase on 6.0-rc2 and Darrick's patch[2]. > > > > > > Changes since v5: > > > 1. Renamed MF_MEM_REMOVE to MF_MEM_PRE_REMOVE > > > 2. hold s_umount before sync_filesystem() > > > 3. do sync_filesystem() after SB_BORN check > > > 4. Rebased on next-20220714 > > > > > > [1]: > > > https://lore.kernel.org/linux-mm/161604050314.1463742.14151665140035795571.stgit@dwillia2-desk3.amr.corp.intel.com/ > > > [2]: https://lore.kernel.org/linux-xfs/Yv5wIa2crHioYeRr@magnolia/ > > > > > > Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com> > > > Reviewed-by: Darrick J. Wong <djwong@kernel.org> > > > --- > > > drivers/dax/super.c | 3 ++- > > > fs/xfs/xfs_notify_failure.c | 15 +++++++++++++++ > > > include/linux/mm.h | 1 + > > > 3 files changed, 18 insertions(+), 1 deletion(-) > > > > > > diff --git a/drivers/dax/super.c b/drivers/dax/super.c > > > index 9b5e2a5eb0ae..cf9a64563fbe 100644 > > > --- a/drivers/dax/super.c > > > +++ b/drivers/dax/super.c > > > @@ -323,7 +323,8 @@ void kill_dax(struct dax_device *dax_dev) > > > return; > > > if (dax_dev->holder_data != NULL) > > > - dax_holder_notify_failure(dax_dev, 0, U64_MAX, 0); > > > + dax_holder_notify_failure(dax_dev, 0, U64_MAX, > > > + MF_MEM_PRE_REMOVE); > > > clear_bit(DAXDEV_ALIVE, &dax_dev->flags); > > > synchronize_srcu(&dax_srcu); > > > diff --git a/fs/xfs/xfs_notify_failure.c b/fs/xfs/xfs_notify_failure.c > > > index 65d5eb20878e..a9769f17e998 100644 > > > --- a/fs/xfs/xfs_notify_failure.c > > > +++ b/fs/xfs/xfs_notify_failure.c > > > @@ -77,6 +77,9 @@ xfs_dax_failure_fn( > > > if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) || > > > (rec->rm_flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK))) { > > > + /* Do not shutdown so early when device is to be removed */ > > > + if (notify->mf_flags & MF_MEM_PRE_REMOVE) > > > + return 0; > > > notify->want_shutdown = true; > > > return 0; > > > } > > > @@ -182,12 +185,22 @@ xfs_dax_notify_failure( > > > struct xfs_mount *mp = dax_holder(dax_dev); > > > u64 ddev_start; > > > u64 ddev_end; > > > + int error; > > > if (!(mp->m_sb.sb_flags & SB_BORN)) { > > > > How are you testing the SB_BORN interactions? I have a fix for this > > pending here: > > > > https://lore.kernel.org/nvdimm/166153428094.2758201.7936572520826540019.stgit@dwillia2-xfh.jf.intel.com/ > > That was my mistake. Yes, it should be mp->m_super->s_flags. > > (I remember my testcase did pass in my dev version, but now that seems > impossible. I think something was wrong when I did the test.) > > > > > > xfs_warn(mp, "filesystem is not ready for notify_failure()!"); > > > return -EIO; > > > } > > > + if (mf_flags & MF_MEM_PRE_REMOVE) { > > > > It appears this patch is corrupted here. I confirmed that b4 sees the > > same when trying to apply it. > > Can't this patch be applied? It is based on 6.0-rc2 + Darrick's patch. It's > also ok to rebase on 6.0-rc3 + Darrick's patch. > > > > > > + xfs_info(mp, "device is about to be removed!"); > > > + down_write(&mp->m_super->s_umount); > > > + error = sync_filesystem(mp->m_super); > > > > This syncs to make data persistent, but for DAX this also needs to get > > invalidate all current DAX mappings. I do not see that in these changes. > > I'll add it. Are you guys going to pick up [1]? --D [1] https://lore.kernel.org/linux-xfs/Yv5wIa2crHioYeRr@magnolia/ > > -- > Thanks, > Ruan. > > > > > > + up_write(&mp->m_super->s_umount); > > > + if (error) > > > + return error; > > > + } > > > + > > > if (mp->m_rtdev_targp && mp->m_rtdev_targp->bt_daxdev == dax_dev) { > > > xfs_warn(mp, > > > "notify_failure() not supported on realtime device!"); > > > @@ -196,6 +209,8 @@ xfs_dax_notify_failure( > > > if (mp->m_logdev_targp && mp->m_logdev_targp->bt_daxdev == dax_dev && > > > mp->m_logdev_targp != mp->m_ddev_targp) { > > > + if (mf_flags & MF_MEM_PRE_REMOVE) > > > + return 0; > > > xfs_err(mp, "ondisk log corrupt, shutting down fs!"); > > > xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_ONDISK); > > > return -EFSCORRUPTED; > > > diff --git a/include/linux/mm.h b/include/linux/mm.h > > > index 982f2607180b..2c7c132e6512 100644 > > > --- a/include/linux/mm.h > > > +++ b/include/linux/mm.h > > > @@ -3176,6 +3176,7 @@ enum mf_flags { > > > MF_UNPOISON = 1 << 4, > > > MF_SW_SIMULATED = 1 << 5, > > > MF_NO_RETRY = 1 << 6, > > > + MF_MEM_PRE_REMOVE = 1 << 7, > > > }; > > > int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, > > > unsigned long count, int mf_flags); > > > -- > > > 2.37.2 > > > > > > > > > >
Changes since v7: 1. Add P1 to fix calculation mistake 2. Add P2 to move drop_pagecache_sb() to super.c for xfs to use 3. P3: Add invalidate all mappings after sync. 4. P3: Set offset&len to be start&length of device when it is to be removed. 5. Rebase on 6.0-rc3 + Darrick's patch[1] + Dan's patch[2]. Changes since v6: 1. Rebase on 6.0-rc2 and Darrick's patch[1]. [1]: https://lore.kernel.org/linux-xfs/Yv5wIa2crHioYeRr@magnolia/ [2]: https://lore.kernel.org/linux-xfs/166153426798.2758201.15108211981034512993.stgit@dwillia2-xfh.jf.intel.com/ Shiyang Ruan (3): xfs: fix the calculation of length and end fs: move drop_pagecache_sb() for others to use mm, pmem, xfs: Introduce MF_MEM_REMOVE for unbind drivers/dax/super.c | 3 ++- fs/drop_caches.c | 33 --------------------------------- fs/super.c | 34 ++++++++++++++++++++++++++++++++++ fs/xfs/xfs_notify_failure.c | 31 +++++++++++++++++++++++++++---- include/linux/fs.h | 1 + include/linux/mm.h | 1 + 6 files changed, 65 insertions(+), 38 deletions(-)
ping 在 2022/9/2 18:35, Shiyang Ruan 写道: > Changes since v7: > 1. Add P1 to fix calculation mistake > 2. Add P2 to move drop_pagecache_sb() to super.c for xfs to use > 3. P3: Add invalidate all mappings after sync. > 4. P3: Set offset&len to be start&length of device when it is to be removed. > 5. Rebase on 6.0-rc3 + Darrick's patch[1] + Dan's patch[2]. > > Changes since v6: > 1. Rebase on 6.0-rc2 and Darrick's patch[1]. > > [1]: https://lore.kernel.org/linux-xfs/Yv5wIa2crHioYeRr@magnolia/ > [2]: https://lore.kernel.org/linux-xfs/166153426798.2758201.15108211981034512993.stgit@dwillia2-xfh.jf.intel.com/ > > Shiyang Ruan (3): > xfs: fix the calculation of length and end > fs: move drop_pagecache_sb() for others to use > mm, pmem, xfs: Introduce MF_MEM_REMOVE for unbind > > drivers/dax/super.c | 3 ++- > fs/drop_caches.c | 33 --------------------------------- > fs/super.c | 34 ++++++++++++++++++++++++++++++++++ > fs/xfs/xfs_notify_failure.c | 31 +++++++++++++++++++++++++++---- > include/linux/fs.h | 1 + > include/linux/mm.h | 1 + > 6 files changed, 65 insertions(+), 38 deletions(-) >
On Wed, Sep 07, 2022 at 05:46:00PM +0800, Shiyang Ruan wrote: > ping > > 在 2022/9/2 18:35, Shiyang Ruan 写道: > > Changes since v7: > > 1. Add P1 to fix calculation mistake > > 2. Add P2 to move drop_pagecache_sb() to super.c for xfs to use > > 3. P3: Add invalidate all mappings after sync. > > 4. P3: Set offset&len to be start&length of device when it is to be removed. > > 5. Rebase on 6.0-rc3 + Darrick's patch[1] + Dan's patch[2]. > > > > Changes since v6: > > 1. Rebase on 6.0-rc2 and Darrick's patch[1]. > > > > [1]: https://lore.kernel.org/linux-xfs/Yv5wIa2crHioYeRr@magnolia/ > > [2]: https://lore.kernel.org/linux-xfs/166153426798.2758201.15108211981034512993.stgit@dwillia2-xfh.jf.intel.com/ Just out of curiosity, is it your (or djbw's) intent to send all these as bugfixes for 6.0 via akpm like all the other dax fixen? --D > > > > Shiyang Ruan (3): > > xfs: fix the calculation of length and end > > fs: move drop_pagecache_sb() for others to use > > mm, pmem, xfs: Introduce MF_MEM_REMOVE for unbind > > > > drivers/dax/super.c | 3 ++- > > fs/drop_caches.c | 33 --------------------------------- > > fs/super.c | 34 ++++++++++++++++++++++++++++++++++ > > fs/xfs/xfs_notify_failure.c | 31 +++++++++++++++++++++++++++---- > > include/linux/fs.h | 1 + > > include/linux/mm.h | 1 + > > 6 files changed, 65 insertions(+), 38 deletions(-) > >
On Wed, Sep 14, 2022 at 11:09:23AM -0700, Darrick J. Wong wrote: > On Wed, Sep 07, 2022 at 05:46:00PM +0800, Shiyang Ruan wrote: > > ping > > > > 在 2022/9/2 18:35, Shiyang Ruan 写道: > > > Changes since v7: > > > 1. Add P1 to fix calculation mistake > > > 2. Add P2 to move drop_pagecache_sb() to super.c for xfs to use > > > 3. P3: Add invalidate all mappings after sync. > > > 4. P3: Set offset&len to be start&length of device when it is to be removed. > > > 5. Rebase on 6.0-rc3 + Darrick's patch[1] + Dan's patch[2]. > > > > > > Changes since v6: > > > 1. Rebase on 6.0-rc2 and Darrick's patch[1]. > > > > > > [1]: https://lore.kernel.org/linux-xfs/Yv5wIa2crHioYeRr@magnolia/ > > > [2]: https://lore.kernel.org/linux-xfs/166153426798.2758201.15108211981034512993.stgit@dwillia2-xfh.jf.intel.com/ > > Just out of curiosity, is it your (or djbw's) intent to send all these > as bugfixes for 6.0 via akpm like all the other dax fixen? Aha, this is 6.1 stuff, please ignore this question. --D > --D > > > > > > > Shiyang Ruan (3): > > > xfs: fix the calculation of length and end > > > fs: move drop_pagecache_sb() for others to use > > > mm, pmem, xfs: Introduce MF_MEM_REMOVE for unbind > > > > > > drivers/dax/super.c | 3 ++- > > > fs/drop_caches.c | 33 --------------------------------- > > > fs/super.c | 34 ++++++++++++++++++++++++++++++++++ > > > fs/xfs/xfs_notify_failure.c | 31 +++++++++++++++++++++++++++---- > > > include/linux/fs.h | 1 + > > > include/linux/mm.h | 1 + > > > 6 files changed, 65 insertions(+), 38 deletions(-) > > >
在 2022/9/15 2:15, Darrick J. Wong 写道: > On Wed, Sep 14, 2022 at 11:09:23AM -0700, Darrick J. Wong wrote: >> On Wed, Sep 07, 2022 at 05:46:00PM +0800, Shiyang Ruan wrote: >>> ping >>> >>> 在 2022/9/2 18:35, Shiyang Ruan 写道: >>>> Changes since v7: >>>> 1. Add P1 to fix calculation mistake >>>> 2. Add P2 to move drop_pagecache_sb() to super.c for xfs to use >>>> 3. P3: Add invalidate all mappings after sync. >>>> 4. P3: Set offset&len to be start&length of device when it is to be removed. >>>> 5. Rebase on 6.0-rc3 + Darrick's patch[1] + Dan's patch[2]. >>>> >>>> Changes since v6: >>>> 1. Rebase on 6.0-rc2 and Darrick's patch[1]. >>>> >>>> [1]: https://lore.kernel.org/linux-xfs/Yv5wIa2crHioYeRr@magnolia/ >>>> [2]: https://lore.kernel.org/linux-xfs/166153426798.2758201.15108211981034512993.stgit@dwillia2-xfh.jf.intel.com/ >> >> Just out of curiosity, is it your (or djbw's) intent to send all these >> as bugfixes for 6.0 via akpm like all the other dax fixen? > > Aha, this is 6.1 stuff, please ignore this question. Actually I hope these patches can be merged ASAP. (But it seems a bit late for 6.0 now.) And do you know which/whose branch has picked up your patch[1]? I cannot find it. -- Thanks, Ruan. > > --D > >> --D >> >>>> >>>> Shiyang Ruan (3): >>>> xfs: fix the calculation of length and end >>>> fs: move drop_pagecache_sb() for others to use >>>> mm, pmem, xfs: Introduce MF_MEM_REMOVE for unbind >>>> >>>> drivers/dax/super.c | 3 ++- >>>> fs/drop_caches.c | 33 --------------------------------- >>>> fs/super.c | 34 ++++++++++++++++++++++++++++++++++ >>>> fs/xfs/xfs_notify_failure.c | 31 +++++++++++++++++++++++++++---- >>>> include/linux/fs.h | 1 + >>>> include/linux/mm.h | 1 + >>>> 6 files changed, 65 insertions(+), 38 deletions(-) >>>>
On Thu, Sep 15, 2022 at 10:56:09AM +0800, Shiyang Ruan wrote: > > > 在 2022/9/15 2:15, Darrick J. Wong 写道: > > On Wed, Sep 14, 2022 at 11:09:23AM -0700, Darrick J. Wong wrote: > > > On Wed, Sep 07, 2022 at 05:46:00PM +0800, Shiyang Ruan wrote: > > > > ping > > > > > > > > 在 2022/9/2 18:35, Shiyang Ruan 写道: > > > > > Changes since v7: > > > > > 1. Add P1 to fix calculation mistake > > > > > 2. Add P2 to move drop_pagecache_sb() to super.c for xfs to use > > > > > 3. P3: Add invalidate all mappings after sync. > > > > > 4. P3: Set offset&len to be start&length of device when it is to be removed. > > > > > 5. Rebase on 6.0-rc3 + Darrick's patch[1] + Dan's patch[2]. > > > > > > > > > > Changes since v6: > > > > > 1. Rebase on 6.0-rc2 and Darrick's patch[1]. > > > > > > > > > > [1]: https://lore.kernel.org/linux-xfs/Yv5wIa2crHioYeRr@magnolia/ > > > > > [2]: https://lore.kernel.org/linux-xfs/166153426798.2758201.15108211981034512993.stgit@dwillia2-xfh.jf.intel.com/ > > > > > > Just out of curiosity, is it your (or djbw's) intent to send all these > > > as bugfixes for 6.0 via akpm like all the other dax fixen? > > > > Aha, this is 6.1 stuff, please ignore this question. > > Actually I hope these patches can be merged ASAP. (But it seems a bit late > for 6.0 now.) > > And do you know which/whose branch has picked up your patch[1]? I cannot > find it. It's not upstream, though the maintainer (Dave currently) reviewed it. I don't know if he hasn't had time to put together a fixes branch or if he's simply punting all the queued up stuff to 6.1. (Dave?) --D > > -- > Thanks, > Ruan. > > > > > --D > > > > > --D > > > > > > > > > > > > > Shiyang Ruan (3): > > > > > xfs: fix the calculation of length and end > > > > > fs: move drop_pagecache_sb() for others to use > > > > > mm, pmem, xfs: Introduce MF_MEM_REMOVE for unbind > > > > > > > > > > drivers/dax/super.c | 3 ++- > > > > > fs/drop_caches.c | 33 --------------------------------- > > > > > fs/super.c | 34 ++++++++++++++++++++++++++++++++++ > > > > > fs/xfs/xfs_notify_failure.c | 31 +++++++++++++++++++++++++++---- > > > > > include/linux/fs.h | 1 + > > > > > include/linux/mm.h | 1 + > > > > > 6 files changed, 65 insertions(+), 38 deletions(-) > > > > >
diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 9b5e2a5eb0ae..cf9a64563fbe 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -323,7 +323,8 @@ void kill_dax(struct dax_device *dax_dev) return; if (dax_dev->holder_data != NULL) - dax_holder_notify_failure(dax_dev, 0, U64_MAX, 0); + dax_holder_notify_failure(dax_dev, 0, U64_MAX, + MF_MEM_PRE_REMOVE); clear_bit(DAXDEV_ALIVE, &dax_dev->flags); synchronize_srcu(&dax_srcu); diff --git a/fs/xfs/xfs_notify_failure.c b/fs/xfs/xfs_notify_failure.c index 65d5eb20878e..a9769f17e998 100644 --- a/fs/xfs/xfs_notify_failure.c +++ b/fs/xfs/xfs_notify_failure.c @@ -77,6 +77,9 @@ xfs_dax_failure_fn( if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) || (rec->rm_flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK))) { + /* Do not shutdown so early when device is to be removed */ + if (notify->mf_flags & MF_MEM_PRE_REMOVE) + return 0; notify->want_shutdown = true; return 0; } @@ -182,12 +185,22 @@ xfs_dax_notify_failure( struct xfs_mount *mp = dax_holder(dax_dev); u64 ddev_start; u64 ddev_end; + int error; if (!(mp->m_sb.sb_flags & SB_BORN)) { xfs_warn(mp, "filesystem is not ready for notify_failure()!"); return -EIO; } + if (mf_flags & MF_MEM_PRE_REMOVE) { + xfs_info(mp, "device is about to be removed!"); + down_write(&mp->m_super->s_umount); + error = sync_filesystem(mp->m_super); + up_write(&mp->m_super->s_umount); + if (error) + return error; + } + if (mp->m_rtdev_targp && mp->m_rtdev_targp->bt_daxdev == dax_dev) { xfs_warn(mp, "notify_failure() not supported on realtime device!"); @@ -196,6 +209,8 @@ xfs_dax_notify_failure( if (mp->m_logdev_targp && mp->m_logdev_targp->bt_daxdev == dax_dev && mp->m_logdev_targp != mp->m_ddev_targp) { + if (mf_flags & MF_MEM_PRE_REMOVE) + return 0; xfs_err(mp, "ondisk log corrupt, shutting down fs!"); xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_ONDISK); return -EFSCORRUPTED; diff --git a/include/linux/mm.h b/include/linux/mm.h index 982f2607180b..2c7c132e6512 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3176,6 +3176,7 @@ enum mf_flags { MF_UNPOISON = 1 << 4, MF_SW_SIMULATED = 1 << 5, MF_NO_RETRY = 1 << 6, + MF_MEM_PRE_REMOVE = 1 << 7, }; int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, unsigned long count, int mf_flags);
This patch is inspired by Dan's "mm, dax, pmem: Introduce dev_pagemap_failure()"[1]. With the help of dax_holder and ->notify_failure() mechanism, the pmem driver is able to ask filesystem (or mapped device) on it to unmap all files in use and notify processes who are using those files. Call trace: trigger unbind -> unbind_store() -> ... (skip) -> devres_release_all() -> kill_dax() -> dax_holder_notify_failure(dax_dev, 0, U64_MAX, MF_MEM_PRE_REMOVE) -> xfs_dax_notify_failure() Introduce MF_MEM_PRE_REMOVE to let filesystem know this is a remove event. So do not shutdown filesystem directly if something not supported, or if failure range includes metadata area. Make sure all files and processes are handled correctly. == Changes since v6: 1. Rebase on 6.0-rc2 and Darrick's patch[2]. Changes since v5: 1. Renamed MF_MEM_REMOVE to MF_MEM_PRE_REMOVE 2. hold s_umount before sync_filesystem() 3. do sync_filesystem() after SB_BORN check 4. Rebased on next-20220714 [1]: https://lore.kernel.org/linux-mm/161604050314.1463742.14151665140035795571.stgit@dwillia2-desk3.amr.corp.intel.com/ [2]: https://lore.kernel.org/linux-xfs/Yv5wIa2crHioYeRr@magnolia/ Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> --- drivers/dax/super.c | 3 ++- fs/xfs/xfs_notify_failure.c | 15 +++++++++++++++ include/linux/mm.h | 1 + 3 files changed, 18 insertions(+), 1 deletion(-)