| Message ID | 20211226143439.3985960-5-ruansy.fnst@fujitsu.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | fsdax: introduce fs query to support reflink | expand |
On Sun, Dec 26, 2021 at 10:34:33PM +0800, Shiyang Ruan wrote: > When memory-failure occurs, we call this function which is implemented > by each kind of devices. For the fsdax case, pmem device driver > implements it. Pmem device driver will find out the filesystem in which > the corrupted page located in. > > With dax_holder notify support, we are able to notify the memory failure > from pmem driver to upper layers. If there is something not support in > the notify routine, memory_failure will fall back to the generic hanlder. > > Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com> > Reviewed-by: Christoph Hellwig <hch@lst.de> > --- > drivers/nvdimm/pmem.c | 16 ++++++++++++++++ > include/linux/memremap.h | 9 +++++++++ > mm/memory-failure.c | 14 ++++++++++++++ > 3 files changed, 39 insertions(+) > > diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c > index 4190c8c46ca8..2114554358eb 100644 > --- a/drivers/nvdimm/pmem.c > +++ b/drivers/nvdimm/pmem.c > @@ -386,6 +386,20 @@ static void pmem_release_disk(void *__pmem) > blk_cleanup_disk(pmem->disk); > } > > +static int pmem_pagemap_memory_failure(struct dev_pagemap *pgmap, > + unsigned long pfn, u64 len, int mf_flags) > +{ > + struct pmem_device *pmem = > + container_of(pgmap, struct pmem_device, pgmap); > + loff_t offset = PFN_PHYS(pfn) - pmem->phys_addr - pmem->data_offset; Use u64 here ^^^ because this isn't a file offset, this is a physical offset. Also, loff_t is signed, which you probably don't want. > + > + return dax_holder_notify_failure(pmem->dax_dev, offset, len, mf_flags); > +} > + > +static const struct dev_pagemap_ops fsdax_pagemap_ops = { > + .memory_failure = pmem_pagemap_memory_failure, > +}; > + > static int pmem_attach_disk(struct device *dev, > struct nd_namespace_common *ndns) > { > @@ -448,6 +462,7 @@ static int pmem_attach_disk(struct device *dev, > pmem->pfn_flags = PFN_DEV; > if (is_nd_pfn(dev)) { > pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; > + pmem->pgmap.ops = &fsdax_pagemap_ops; > addr = devm_memremap_pages(dev, &pmem->pgmap); > pfn_sb = nd_pfn->pfn_sb; > pmem->data_offset = le64_to_cpu(pfn_sb->dataoff); > @@ -461,6 +476,7 @@ static int pmem_attach_disk(struct device *dev, > pmem->pgmap.range.end = res->end; > pmem->pgmap.nr_range = 1; > pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; > + pmem->pgmap.ops = &fsdax_pagemap_ops; > addr = devm_memremap_pages(dev, &pmem->pgmap); > pmem->pfn_flags |= PFN_MAP; > bb_range = pmem->pgmap.range; > diff --git a/include/linux/memremap.h b/include/linux/memremap.h > index c0e9d35889e8..820c2f33b163 100644 > --- a/include/linux/memremap.h > +++ b/include/linux/memremap.h > @@ -87,6 +87,15 @@ struct dev_pagemap_ops { > * the page back to a CPU accessible page. > */ > vm_fault_t (*migrate_to_ram)(struct vm_fault *vmf); > + > + /* > + * Handle the memory failure happens on a range of pfns. Notify the > + * processes who are using these pfns, and try to recover the data on > + * them if necessary. The mf_flags is finally passed to the recover > + * function through the whole notify routine. Might want to state here that the generic implementation will be used if ->memory_failure is NULL or calling the function returns -EOPNOTSUPP. --D > + */ > + int (*memory_failure)(struct dev_pagemap *pgmap, unsigned long pfn, > + u64 len, int mf_flags); > }; > > #define PGMAP_ALTMAP_VALID (1 << 0) > diff --git a/mm/memory-failure.c b/mm/memory-failure.c > index 1ee7d626fed7..3cc612b29f89 100644 > --- a/mm/memory-failure.c > +++ b/mm/memory-failure.c > @@ -1625,6 +1625,20 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, > if (!pgmap_pfn_valid(pgmap, pfn)) > goto out; > > + /* > + * Call driver's implementation to handle the memory failure, otherwise > + * fall back to generic handler. > + */ > + if (pgmap->ops->memory_failure) { > + rc = pgmap->ops->memory_failure(pgmap, pfn, PAGE_SIZE, flags); > + /* > + * Fall back to generic handler too if operation is not > + * supported inside the driver/device/filesystem. > + */ > + if (rc != -EOPNOTSUPP) > + goto out; > + } > + > rc = mf_generic_kill_procs(pfn, flags, pgmap); > out: > /* drop pgmap ref acquired in caller */ > -- > 2.34.1 > > >
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 4190c8c46ca8..2114554358eb 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -386,6 +386,20 @@ static void pmem_release_disk(void *__pmem) blk_cleanup_disk(pmem->disk); } +static int pmem_pagemap_memory_failure(struct dev_pagemap *pgmap, + unsigned long pfn, u64 len, int mf_flags) +{ + struct pmem_device *pmem = + container_of(pgmap, struct pmem_device, pgmap); + loff_t offset = PFN_PHYS(pfn) - pmem->phys_addr - pmem->data_offset; + + return dax_holder_notify_failure(pmem->dax_dev, offset, len, mf_flags); +} + +static const struct dev_pagemap_ops fsdax_pagemap_ops = { + .memory_failure = pmem_pagemap_memory_failure, +}; + static int pmem_attach_disk(struct device *dev, struct nd_namespace_common *ndns) { @@ -448,6 +462,7 @@ static int pmem_attach_disk(struct device *dev, pmem->pfn_flags = PFN_DEV; if (is_nd_pfn(dev)) { pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; + pmem->pgmap.ops = &fsdax_pagemap_ops; addr = devm_memremap_pages(dev, &pmem->pgmap); pfn_sb = nd_pfn->pfn_sb; pmem->data_offset = le64_to_cpu(pfn_sb->dataoff); @@ -461,6 +476,7 @@ static int pmem_attach_disk(struct device *dev, pmem->pgmap.range.end = res->end; pmem->pgmap.nr_range = 1; pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; + pmem->pgmap.ops = &fsdax_pagemap_ops; addr = devm_memremap_pages(dev, &pmem->pgmap); pmem->pfn_flags |= PFN_MAP; bb_range = pmem->pgmap.range; diff --git a/include/linux/memremap.h b/include/linux/memremap.h index c0e9d35889e8..820c2f33b163 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -87,6 +87,15 @@ struct dev_pagemap_ops { * the page back to a CPU accessible page. */ vm_fault_t (*migrate_to_ram)(struct vm_fault *vmf); + + /* + * Handle the memory failure happens on a range of pfns. Notify the + * processes who are using these pfns, and try to recover the data on + * them if necessary. The mf_flags is finally passed to the recover + * function through the whole notify routine. + */ + int (*memory_failure)(struct dev_pagemap *pgmap, unsigned long pfn, + u64 len, int mf_flags); }; #define PGMAP_ALTMAP_VALID (1 << 0) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 1ee7d626fed7..3cc612b29f89 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1625,6 +1625,20 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, if (!pgmap_pfn_valid(pgmap, pfn)) goto out; + /* + * Call driver's implementation to handle the memory failure, otherwise + * fall back to generic handler. + */ + if (pgmap->ops->memory_failure) { + rc = pgmap->ops->memory_failure(pgmap, pfn, PAGE_SIZE, flags); + /* + * Fall back to generic handler too if operation is not + * supported inside the driver/device/filesystem. + */ + if (rc != -EOPNOTSUPP) + goto out; + } + rc = mf_generic_kill_procs(pfn, flags, pgmap); out: /* drop pgmap ref acquired in caller */