| Message ID | 20210730085245.3069812-1-ruansy.fnst@fujitsu.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | fsdax: introduce fs query to support reflink | expand |
There is no ocurrence of "corrupted_range" in this patch. Does the patch subject need updating? On 30.07.21 10:52, Shiyang Ruan wrote: > This function is used to handle errors which may cause data lost in > filesystem. Such as memory failure in fsdax mode. > > If the rmap feature of XFS enabled, we can query it to find files and > metadata which are associated with the corrupt data. For now all we do > is kill processes with that file mapped into their address spaces, but > future patches could actually do something about corrupt metadata. > > After that, the memory failure needs to notify the processes who are > using those files. > > Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com> > --- > drivers/dax/super.c | 12 ++++ > fs/xfs/xfs_fsops.c | 5 ++ > fs/xfs/xfs_mount.h | 1 + > fs/xfs/xfs_super.c | 135 ++++++++++++++++++++++++++++++++++++++++++++ > include/linux/dax.h | 13 +++++ > 5 files changed, 166 insertions(+) > > diff --git a/drivers/dax/super.c b/drivers/dax/super.c > index 00c32dfa5665..63f7b63d078d 100644 > --- a/drivers/dax/super.c > +++ b/drivers/dax/super.c > @@ -65,6 +65,18 @@ struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev) > return dax_get_by_host(bdev->bd_disk->disk_name); > } > EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev); > + > +void fs_dax_set_holder(struct dax_device *dax_dev, void *holder, > + const struct dax_holder_operations *ops) > +{ > + dax_set_holder(dax_dev, holder, ops); > +} > +EXPORT_SYMBOL_GPL(fs_dax_set_holder); > +void *fs_dax_get_holder(struct dax_device *dax_dev) > +{ > + return dax_get_holder(dax_dev); > +} > +EXPORT_SYMBOL_GPL(fs_dax_get_holder); > #endif > > bool __generic_fsdax_supported(struct dax_device *dax_dev, > diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c > index 6ed29b158312..e96ddb5c28bc 100644 > --- a/fs/xfs/xfs_fsops.c > +++ b/fs/xfs/xfs_fsops.c > @@ -549,6 +549,11 @@ xfs_do_force_shutdown( > flags, __return_address, fname, lnnum); > if (XFS_ERRLEVEL_HIGH <= xfs_error_level) > xfs_stack_trace(); > + } else if (flags & SHUTDOWN_CORRUPT_META) { > + xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT, > +"Corruption of on-disk metadata detected. Shutting down filesystem"); > + if (XFS_ERRLEVEL_HIGH <= xfs_error_level) > + xfs_stack_trace(); > } else if (logerror) { > xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR, > "Log I/O error (0x%x) detected at %pS (%s:%d). Shutting down filesystem", > diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h > index c78b63fe779a..203eb62d16d0 100644 > --- a/fs/xfs/xfs_mount.h > +++ b/fs/xfs/xfs_mount.h > @@ -277,6 +277,7 @@ void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname, > #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */ > #define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */ > #define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */ > +#define SHUTDOWN_CORRUPT_META 0x0010 /* corrupt metadata on device */ > > /* > * Flags for xfs_mountfs > diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c > index 2c9e26a44546..4a362e14318d 100644 > --- a/fs/xfs/xfs_super.c > +++ b/fs/xfs/xfs_super.c > @@ -37,11 +37,19 @@ > #include "xfs_reflink.h" > #include "xfs_pwork.h" > #include "xfs_ag.h" > +#include "xfs_alloc.h" > +#include "xfs_rmap.h" > +#include "xfs_rmap_btree.h" > +#include "xfs_rtalloc.h" > +#include "xfs_bit.h" > > #include <linux/magic.h> > #include <linux/fs_context.h> > #include <linux/fs_parser.h> > +#include <linux/mm.h> > +#include <linux/dax.h> > > +static const struct dax_holder_operations xfs_dax_holder_operations; > static const struct super_operations xfs_super_operations; > > static struct kset *xfs_kset; /* top-level xfs sysfs dir */ > @@ -352,6 +360,7 @@ xfs_close_devices( > > xfs_free_buftarg(mp->m_logdev_targp); > xfs_blkdev_put(logdev); > + fs_dax_set_holder(dax_logdev, NULL, NULL); > fs_put_dax(dax_logdev); > } > if (mp->m_rtdev_targp) { > @@ -360,9 +369,11 @@ xfs_close_devices( > > xfs_free_buftarg(mp->m_rtdev_targp); > xfs_blkdev_put(rtdev); > + fs_dax_set_holder(dax_rtdev, NULL, NULL); > fs_put_dax(dax_rtdev); > } > xfs_free_buftarg(mp->m_ddev_targp); > + fs_dax_set_holder(dax_ddev, NULL, NULL); > fs_put_dax(dax_ddev); > } > > @@ -386,6 +397,7 @@ xfs_open_devices( > struct block_device *logdev = NULL, *rtdev = NULL; > int error; > > + fs_dax_set_holder(dax_ddev, mp, &xfs_dax_holder_operations); > /* > * Open real time and log devices - order is important. > */ > @@ -394,6 +406,9 @@ xfs_open_devices( > if (error) > goto out; > dax_logdev = fs_dax_get_by_bdev(logdev); > + if (dax_logdev != dax_ddev) > + fs_dax_set_holder(dax_logdev, mp, > + &xfs_dax_holder_operations); > } > > if (mp->m_rtname) { > @@ -408,6 +423,7 @@ xfs_open_devices( > goto out_close_rtdev; > } > dax_rtdev = fs_dax_get_by_bdev(rtdev); > + fs_dax_set_holder(dax_rtdev, mp, &xfs_dax_holder_operations); > } > > /* > @@ -1070,6 +1086,125 @@ xfs_fs_free_cached_objects( > return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan); > } > > +static int > +xfs_corrupt_helper( > + struct xfs_btree_cur *cur, > + struct xfs_rmap_irec *rec, > + void *data) > +{ > + struct xfs_inode *ip; > + struct address_space *mapping; > + int error = 0, *flags = data, i; > + > + if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) || > + (rec->rm_flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK))) { > + // TODO check and try to fix metadata > + xfs_force_shutdown(cur->bc_mp, SHUTDOWN_CORRUPT_META); > + return -EFSCORRUPTED; > + } > + > + /* Get files that incore, filter out others that are not in use. */ > + error = xfs_iget(cur->bc_mp, cur->bc_tp, rec->rm_owner, XFS_IGET_INCORE, > + 0, &ip); > + if (error) > + return error; > + > + mapping = VFS_I(ip)->i_mapping; > + if (IS_ENABLED(CONFIG_MEMORY_FAILURE)) { > + for (i = 0; i < rec->rm_blockcount; i++) { > + error = mf_dax_kill_procs(mapping, rec->rm_offset + i, > + *flags); > + if (error) > + break; > + } > + } > + // TODO try to fix data > + xfs_irele(ip); > + > + return error; > +} > + > +static loff_t > +xfs_dax_bdev_offset( > + struct xfs_mount *mp, > + struct dax_device *dax_dev, > + loff_t disk_offset) > +{ > + struct block_device *bdev; > + > + if (mp->m_ddev_targp->bt_daxdev == dax_dev) > + bdev = mp->m_ddev_targp->bt_bdev; > + else if (mp->m_logdev_targp->bt_daxdev == dax_dev) > + bdev = mp->m_logdev_targp->bt_bdev; > + else > + bdev = mp->m_rtdev_targp->bt_bdev; > + > + return disk_offset - (get_start_sect(bdev) << SECTOR_SHIFT); > +} > + > +static int > +xfs_dax_notify_failure( > + struct dax_device *dax_dev, > + loff_t offset, > + size_t len, > + void *data) > +{ > + struct xfs_mount *mp = fs_dax_get_holder(dax_dev); > + struct xfs_trans *tp = NULL; > + struct xfs_btree_cur *cur = NULL; > + struct xfs_buf *agf_bp = NULL; > + struct xfs_rmap_irec rmap_low, rmap_high; > + loff_t bdev_offset = xfs_dax_bdev_offset(mp, dax_dev, > + offset); > + xfs_fsblock_t fsbno = XFS_B_TO_FSB(mp, bdev_offset); > + xfs_filblks_t bcnt = XFS_B_TO_FSB(mp, len); > + xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, fsbno); > + xfs_agblock_t agbno = XFS_FSB_TO_AGBNO(mp, fsbno); > + int error = 0; > + > + if (mp->m_logdev_targp && mp->m_logdev_targp->bt_daxdev == dax_dev && > + mp->m_logdev_targp != mp->m_ddev_targp) { > + xfs_err(mp, "ondisk log corrupt, shutting down fs!"); > + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_META); > + return -EFSCORRUPTED; > + } > + > + if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) { > + xfs_warn(mp, "notify_failure() needs rmapbt enabled!"); > + return -EOPNOTSUPP; > + } > + > + error = xfs_trans_alloc_empty(mp, &tp); > + if (error) > + return error; > + > + error = xfs_alloc_read_agf(mp, tp, agno, 0, &agf_bp); > + if (error) > + goto out_cancel_tp; > + > + cur = xfs_rmapbt_init_cursor(mp, tp, agf_bp, agf_bp->b_pag); > + > + /* Construct a range for rmap query */ > + memset(&rmap_low, 0, sizeof(rmap_low)); > + memset(&rmap_high, 0xFF, sizeof(rmap_high)); > + rmap_low.rm_startblock = rmap_high.rm_startblock = agbno; > + rmap_low.rm_blockcount = rmap_high.rm_blockcount = bcnt; > + > + error = xfs_rmap_query_range(cur, &rmap_low, &rmap_high, > + xfs_corrupt_helper, data); > + > + xfs_btree_del_cursor(cur, error); > + xfs_trans_brelse(tp, agf_bp); > + > +out_cancel_tp: > + xfs_trans_cancel(tp); > + return error; > +} > + > +static const struct dax_holder_operations xfs_dax_holder_operations = { > + .notify_failure = xfs_dax_notify_failure, > +}; > + > static const struct super_operations xfs_super_operations = { > .alloc_inode = xfs_fs_alloc_inode, > .destroy_inode = xfs_fs_destroy_inode, > diff --git a/include/linux/dax.h b/include/linux/dax.h > index 359e809516b8..c8a188b76031 100644 > --- a/include/linux/dax.h > +++ b/include/linux/dax.h > @@ -160,6 +160,9 @@ static inline void fs_put_dax(struct dax_device *dax_dev) > } > > struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev); > +void fs_dax_set_holder(struct dax_device *dax_dev, void *holder, > + const struct dax_holder_operations *ops); > +void *fs_dax_get_holder(struct dax_device *dax_dev); > int dax_writeback_mapping_range(struct address_space *mapping, > struct dax_device *dax_dev, struct writeback_control *wbc); > > @@ -191,6 +194,16 @@ static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev) > return NULL; > } > > +static inline void fs_dax_set_holder(struct dax_device *dax_dev, void *holder, > + const struct dax_holder_operations *ops) > +{ > +} > + > +static inline void *fs_dax_get_holder(struct dax_device *dax_dev) > +{ > + return NULL; > +} > + > static inline struct page *dax_layout_busy_page(struct address_space *mapping) > { > return NULL; >
> -----Original Message----- > Subject: Re: [PATCH v6 6/9] xfs: Implement ->corrupted_range() for XFS > > There is no ocurrence of "corrupted_range" in this patch. Does the patch > subject need updating? > Yes, I forgot this... Thanks for pointing out. -- Thanks, Ruan. > > On 30.07.21 10:52, Shiyang Ruan wrote: > > This function is used to handle errors which may cause data lost in > > filesystem. Such as memory failure in fsdax mode. > > > > If the rmap feature of XFS enabled, we can query it to find files and > > metadata which are associated with the corrupt data. For now all we do > > is kill processes with that file mapped into their address spaces, but > > future patches could actually do something about corrupt metadata. > > > > After that, the memory failure needs to notify the processes who are > > using those files. > > > > Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com> > > --- > > drivers/dax/super.c | 12 ++++ > > fs/xfs/xfs_fsops.c | 5 ++ > > fs/xfs/xfs_mount.h | 1 + > > fs/xfs/xfs_super.c | 135 > ++++++++++++++++++++++++++++++++++++++++++++ > > include/linux/dax.h | 13 +++++ > > 5 files changed, 166 insertions(+) > > > > diff --git a/drivers/dax/super.c b/drivers/dax/super.c > > index 00c32dfa5665..63f7b63d078d 100644 > > --- a/drivers/dax/super.c > > +++ b/drivers/dax/super.c > > @@ -65,6 +65,18 @@ struct dax_device *fs_dax_get_by_bdev(struct > block_device *bdev) > > return dax_get_by_host(bdev->bd_disk->disk_name); > > } > > EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev); > > + > > +void fs_dax_set_holder(struct dax_device *dax_dev, void *holder, > > + const struct dax_holder_operations *ops) > > +{ > > + dax_set_holder(dax_dev, holder, ops); > > +} > > +EXPORT_SYMBOL_GPL(fs_dax_set_holder); > > +void *fs_dax_get_holder(struct dax_device *dax_dev) > > +{ > > + return dax_get_holder(dax_dev); > > +} > > +EXPORT_SYMBOL_GPL(fs_dax_get_holder); > > #endif > > > > bool __generic_fsdax_supported(struct dax_device *dax_dev, > > diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c > > index 6ed29b158312..e96ddb5c28bc 100644 > > --- a/fs/xfs/xfs_fsops.c > > +++ b/fs/xfs/xfs_fsops.c > > @@ -549,6 +549,11 @@ xfs_do_force_shutdown( > > flags, __return_address, fname, lnnum); > > if (XFS_ERRLEVEL_HIGH <= xfs_error_level) > > xfs_stack_trace(); > > + } else if (flags & SHUTDOWN_CORRUPT_META) { > > + xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT, > > +"Corruption of on-disk metadata detected. Shutting down filesystem"); > > + if (XFS_ERRLEVEL_HIGH <= xfs_error_level) > > + xfs_stack_trace(); > > } else if (logerror) { > > xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR, > > "Log I/O error (0x%x) detected at %pS (%s:%d). Shutting down filesystem", > > diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h > > index c78b63fe779a..203eb62d16d0 100644 > > --- a/fs/xfs/xfs_mount.h > > +++ b/fs/xfs/xfs_mount.h > > @@ -277,6 +277,7 @@ void xfs_do_force_shutdown(struct xfs_mount *mp, > int flags, char *fname, > > #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the > log failed */ > > #define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from > a forced unmount */ > > #define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt > in-memory data structures */ > > +#define SHUTDOWN_CORRUPT_META 0x0010 /* corrupt metadata on > device */ > > > > /* > > * Flags for xfs_mountfs > > diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c > > index 2c9e26a44546..4a362e14318d 100644 > > --- a/fs/xfs/xfs_super.c > > +++ b/fs/xfs/xfs_super.c > > @@ -37,11 +37,19 @@ > > #include "xfs_reflink.h" > > #include "xfs_pwork.h" > > #include "xfs_ag.h" > > +#include "xfs_alloc.h" > > +#include "xfs_rmap.h" > > +#include "xfs_rmap_btree.h" > > +#include "xfs_rtalloc.h" > > +#include "xfs_bit.h" > > > > #include <linux/magic.h> > > #include <linux/fs_context.h> > > #include <linux/fs_parser.h> > > +#include <linux/mm.h> > > +#include <linux/dax.h> > > > > +static const struct dax_holder_operations xfs_dax_holder_operations; > > static const struct super_operations xfs_super_operations; > > > > static struct kset *xfs_kset; /* top-level xfs sysfs dir */ > > @@ -352,6 +360,7 @@ xfs_close_devices( > > > > xfs_free_buftarg(mp->m_logdev_targp); > > xfs_blkdev_put(logdev); > > + fs_dax_set_holder(dax_logdev, NULL, NULL); > > fs_put_dax(dax_logdev); > > } > > if (mp->m_rtdev_targp) { > > @@ -360,9 +369,11 @@ xfs_close_devices( > > > > xfs_free_buftarg(mp->m_rtdev_targp); > > xfs_blkdev_put(rtdev); > > + fs_dax_set_holder(dax_rtdev, NULL, NULL); > > fs_put_dax(dax_rtdev); > > } > > xfs_free_buftarg(mp->m_ddev_targp); > > + fs_dax_set_holder(dax_ddev, NULL, NULL); > > fs_put_dax(dax_ddev); > > } > > > > @@ -386,6 +397,7 @@ xfs_open_devices( > > struct block_device *logdev = NULL, *rtdev = NULL; > > int error; > > > > + fs_dax_set_holder(dax_ddev, mp, &xfs_dax_holder_operations); > > /* > > * Open real time and log devices - order is important. > > */ > > @@ -394,6 +406,9 @@ xfs_open_devices( > > if (error) > > goto out; > > dax_logdev = fs_dax_get_by_bdev(logdev); > > + if (dax_logdev != dax_ddev) > > + fs_dax_set_holder(dax_logdev, mp, > > + &xfs_dax_holder_operations); > > } > > > > if (mp->m_rtname) { > > @@ -408,6 +423,7 @@ xfs_open_devices( > > goto out_close_rtdev; > > } > > dax_rtdev = fs_dax_get_by_bdev(rtdev); > > + fs_dax_set_holder(dax_rtdev, mp, &xfs_dax_holder_operations); > > } > > > > /* > > @@ -1070,6 +1086,125 @@ xfs_fs_free_cached_objects( > > return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan); > > } > > > > +static int > > +xfs_corrupt_helper( > > + struct xfs_btree_cur *cur, > > + struct xfs_rmap_irec *rec, > > + void *data) > > +{ > > + struct xfs_inode *ip; > > + struct address_space *mapping; > > + int error = 0, *flags = data, i; > > + > > + if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) || > > + (rec->rm_flags & (XFS_RMAP_ATTR_FORK | > XFS_RMAP_BMBT_BLOCK))) { > > + // TODO check and try to fix metadata > > + xfs_force_shutdown(cur->bc_mp, SHUTDOWN_CORRUPT_META); > > + return -EFSCORRUPTED; > > + } > > + > > + /* Get files that incore, filter out others that are not in use. */ > > + error = xfs_iget(cur->bc_mp, cur->bc_tp, rec->rm_owner, > XFS_IGET_INCORE, > > + 0, &ip); > > + if (error) > > + return error; > > + > > + mapping = VFS_I(ip)->i_mapping; > > + if (IS_ENABLED(CONFIG_MEMORY_FAILURE)) { > > + for (i = 0; i < rec->rm_blockcount; i++) { > > + error = mf_dax_kill_procs(mapping, rec->rm_offset + i, > > + *flags); > > + if (error) > > + break; > > + } > > + } > > + // TODO try to fix data > > + xfs_irele(ip); > > + > > + return error; > > +} > > + > > +static loff_t > > +xfs_dax_bdev_offset( > > + struct xfs_mount *mp, > > + struct dax_device *dax_dev, > > + loff_t disk_offset) > > +{ > > + struct block_device *bdev; > > + > > + if (mp->m_ddev_targp->bt_daxdev == dax_dev) > > + bdev = mp->m_ddev_targp->bt_bdev; > > + else if (mp->m_logdev_targp->bt_daxdev == dax_dev) > > + bdev = mp->m_logdev_targp->bt_bdev; > > + else > > + bdev = mp->m_rtdev_targp->bt_bdev; > > + > > + return disk_offset - (get_start_sect(bdev) << SECTOR_SHIFT); > > +} > > + > > +static int > > +xfs_dax_notify_failure( > > + struct dax_device *dax_dev, > > + loff_t offset, > > + size_t len, > > + void *data) > > +{ > > + struct xfs_mount *mp = fs_dax_get_holder(dax_dev); > > + struct xfs_trans *tp = NULL; > > + struct xfs_btree_cur *cur = NULL; > > + struct xfs_buf *agf_bp = NULL; > > + struct xfs_rmap_irec rmap_low, rmap_high; > > + loff_t bdev_offset = xfs_dax_bdev_offset(mp, dax_dev, > > + offset); > > + xfs_fsblock_t fsbno = XFS_B_TO_FSB(mp, bdev_offset); > > + xfs_filblks_t bcnt = XFS_B_TO_FSB(mp, len); > > + xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, fsbno); > > + xfs_agblock_t agbno = XFS_FSB_TO_AGBNO(mp, fsbno); > > + int error = 0; > > + > > + if (mp->m_logdev_targp && mp->m_logdev_targp->bt_daxdev == > dax_dev && > > + mp->m_logdev_targp != mp->m_ddev_targp) { > > + xfs_err(mp, "ondisk log corrupt, shutting down fs!"); > > + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_META); > > + return -EFSCORRUPTED; > > + } > > + > > + if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) { > > + xfs_warn(mp, "notify_failure() needs rmapbt enabled!"); > > + return -EOPNOTSUPP; > > + } > > + > > + error = xfs_trans_alloc_empty(mp, &tp); > > + if (error) > > + return error; > > + > > + error = xfs_alloc_read_agf(mp, tp, agno, 0, &agf_bp); > > + if (error) > > + goto out_cancel_tp; > > + > > + cur = xfs_rmapbt_init_cursor(mp, tp, agf_bp, agf_bp->b_pag); > > + > > + /* Construct a range for rmap query */ > > + memset(&rmap_low, 0, sizeof(rmap_low)); > > + memset(&rmap_high, 0xFF, sizeof(rmap_high)); > > + rmap_low.rm_startblock = rmap_high.rm_startblock = agbno; > > + rmap_low.rm_blockcount = rmap_high.rm_blockcount = bcnt; > > + > > + error = xfs_rmap_query_range(cur, &rmap_low, &rmap_high, > > + xfs_corrupt_helper, data); > > + > > + xfs_btree_del_cursor(cur, error); > > + xfs_trans_brelse(tp, agf_bp); > > + > > +out_cancel_tp: > > + xfs_trans_cancel(tp); > > + return error; > > +} > > + > > +static const struct dax_holder_operations xfs_dax_holder_operations = { > > + .notify_failure = xfs_dax_notify_failure, > > +}; > > + > > static const struct super_operations xfs_super_operations = { > > .alloc_inode = xfs_fs_alloc_inode, > > .destroy_inode = xfs_fs_destroy_inode, > > diff --git a/include/linux/dax.h b/include/linux/dax.h > > index 359e809516b8..c8a188b76031 100644 > > --- a/include/linux/dax.h > > +++ b/include/linux/dax.h > > @@ -160,6 +160,9 @@ static inline void fs_put_dax(struct dax_device > *dax_dev) > > } > > > > struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev); > > +void fs_dax_set_holder(struct dax_device *dax_dev, void *holder, > > + const struct dax_holder_operations *ops); > > +void *fs_dax_get_holder(struct dax_device *dax_dev); > > int dax_writeback_mapping_range(struct address_space *mapping, > > struct dax_device *dax_dev, struct writeback_control *wbc); > > > > @@ -191,6 +194,16 @@ static inline struct dax_device > *fs_dax_get_by_bdev(struct block_device *bdev) > > return NULL; > > } > > > > +static inline void fs_dax_set_holder(struct dax_device *dax_dev, void > *holder, > > + const struct dax_holder_operations *ops) > > +{ > > +} > > + > > +static inline void *fs_dax_get_holder(struct dax_device *dax_dev) > > +{ > > + return NULL; > > +} > > + > > static inline struct page *dax_layout_busy_page(struct address_space > *mapping) > > { > > return NULL; > > > > > -- > Thanks, > > David / dhildenb -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel
This patchset is aimed to support shared pages tracking for fsdax. Change from V5: - fix dax_load_pfn(), take locked,empty,zero dax entry into consideration - fix the usage of rwsem lock for dax_device's holder - fix build error reported by kernelbot - keep functionality of dax_{,dis}assocaite_entry() for filesystems doesn't have rmapbt feature - Rebased to v5.14-rc3 This patchset moves owner tracking from dax_assocaite_entry() to pmem device driver, by introducing an interface ->memory_failure() for struct pagemap. This interface is called by memory_failure() in mm, and implemented by pmem device. Then call holder operations to find the filesystem which the corrupted data located in, and call filesystem handler to track files or metadata associated with this page. Finally we are able to try to fix the corrupted data in filesystem and do other necessary processing, such as killing processes who are using the files affected. The call trace is like this: memory_failure() |* fsdax case |------------ |pgmap->ops->memory_failure() => pmem_pgmap_memory_failure() | dax_holder_notify_failure() => | dax_device->holder_ops->notify_failure() => | - xfs_dax_notify_failure() | - md_dax_notify_failure() | |* xfs_dax_notify_failure() | |-------------------------- | | xfs_rmap_query_range() | | xfs_currupt_helper() | | * corrupted on metadata | | try to recover data, call xfs_force_shutdown() | | * corrupted on file data | | try to recover data, call mf_dax_kill_procs() | |* md_dax_notify_failure() | |------------------------- | md_targets->iterate_devices() | md_targets->rmap() => linear_rmap() | dax_holder_notify_failure() |* normal case |------------- mf_generic_kill_procs() The fsdax & reflink support for XFS is not contained in this patchset. (Rebased on v5.14-rc3) == Shiyang Ruan (9): pagemap: Introduce ->memory_failure() dax: Introduce holder for dax_device mm: factor helpers for memory_failure_dev_pagemap pmem,mm: Implement ->memory_failure in pmem driver mm: Introduce mf_dax_kill_procs() for fsdax case xfs: Implement ->corrupted_range() for XFS dm: Introduce ->rmap() to find bdev offset md: Implement dax_holder_operations fsdax: add exception for reflinked files block/genhd.c | 56 +++++++++++ drivers/dax/super.c | 58 ++++++++++++ drivers/md/dm-linear.c | 20 ++++ drivers/md/dm.c | 126 ++++++++++++++++++++++++- drivers/nvdimm/pmem.c | 13 +++ fs/dax.c | 59 ++++++++---- fs/xfs/xfs_fsops.c | 5 + fs/xfs/xfs_mount.h | 1 + fs/xfs/xfs_super.c | 135 +++++++++++++++++++++++++++ include/linux/dax.h | 46 +++++++++ include/linux/device-mapper.h | 5 + include/linux/genhd.h | 1 + include/linux/memremap.h | 9 ++ include/linux/mm.h | 10 ++ mm/memory-failure.c | 169 +++++++++++++++++++++++----------- 15 files changed, 641 insertions(+), 72 deletions(-)