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Commit 63c04ee7 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'upstream-4.7-rc5' of git://git.infradead.org/linux-ubifs 

Pull UBI/UBIFS fixes from Richard Weinberger:
 "This contains fixes for two critical bugs in UBI and UBIFS:

   - fix the possibility of losing data upon a power cut when UBI tries
     to recover from a write error

   - fix page migration on UBIFS.  It turned out that the default page
     migration function is not suitable for UBIFS"

* tag 'upstream-4.7-rc5' of git://git.infradead.org/linux-ubifs:
  UBIFS: Implement ->migratepage()
  mm: Export migrate_page_move_mapping and migrate_page_copy
  ubi: Make recover_peb power cut aware
  gpio: make library immune to error pointers
  gpio: make sure gpiod_to_irq() returns negative on NULL desc
  gpio: 104-idi-48: Fix missing spin_lock_init for ack_lock
parents 0bf0ea43 4ac1c17b

drivers/mtd/ubi/eba.c

+15 −7
Original line number Diff line number Diff line
@@ -575,6 +575,7 @@ static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum, 
	int err, idx = vol_id2idx(ubi, vol_id), new_pnum, data_size, tries = 0;

	struct ubi_volume *vol = ubi->volumes[idx];

	struct ubi_vid_hdr *vid_hdr;

	uint32_t crc;



	vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);

	if (!vid_hdr)
@@ -599,14 +600,8 @@ static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum, 
		goto out_put;

	}



	vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));

	err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr);

	if (err) {

		up_read(&ubi->fm_eba_sem);

		goto write_error;

	}

	ubi_assert(vid_hdr->vol_type == UBI_VID_DYNAMIC);



	data_size = offset + len;

	mutex_lock(&ubi->buf_mutex);

	memset(ubi->peb_buf + offset, 0xFF, len);
@@ -621,6 +616,19 @@ static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum, 


	memcpy(ubi->peb_buf + offset, buf, len);



	data_size = offset + len;

	crc = crc32(UBI_CRC32_INIT, ubi->peb_buf, data_size);

	vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));

	vid_hdr->copy_flag = 1;

	vid_hdr->data_size = cpu_to_be32(data_size);

	vid_hdr->data_crc = cpu_to_be32(crc);

	err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr);

	if (err) {

		mutex_unlock(&ubi->buf_mutex);

		up_read(&ubi->fm_eba_sem);

		goto write_error;

	}



	err = ubi_io_write_data(ubi, ubi->peb_buf, new_pnum, 0, data_size);

	if (err) {

		mutex_unlock(&ubi->buf_mutex);

fs/ubifs/file.c

+24 −0
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ 
#include "ubifs.h"

#include <linux/mount.h>

#include <linux/slab.h>

#include <linux/migrate.h>



static int read_block(struct inode *inode, void *addr, unsigned int block,

		      struct ubifs_data_node *dn)
@@ -1452,6 +1453,26 @@ static int ubifs_set_page_dirty(struct page *page) 
	return ret;

}



#ifdef CONFIG_MIGRATION

static int ubifs_migrate_page(struct address_space *mapping,

		struct page *newpage, struct page *page, enum migrate_mode mode)

{

	int rc;



	rc = migrate_page_move_mapping(mapping, newpage, page, NULL, mode, 0);

	if (rc != MIGRATEPAGE_SUCCESS)

		return rc;



	if (PagePrivate(page)) {

		ClearPagePrivate(page);

		SetPagePrivate(newpage);

	}



	migrate_page_copy(newpage, page);

	return MIGRATEPAGE_SUCCESS;

}

#endif



static int ubifs_releasepage(struct page *page, gfp_t unused_gfp_flags)

{

	/*
@@ -1591,6 +1612,9 @@ const struct address_space_operations ubifs_file_address_operations = { 
	.write_end      = ubifs_write_end,

	.invalidatepage = ubifs_invalidatepage,

	.set_page_dirty = ubifs_set_page_dirty,

#ifdef CONFIG_MIGRATION

	.migratepage	= ubifs_migrate_page,

#endif

	.releasepage    = ubifs_releasepage,

};

mm/migrate.c

+2 −0
Original line number Diff line number Diff line
@@ -431,6 +431,7 @@ int migrate_page_move_mapping(struct address_space *mapping, 


	return MIGRATEPAGE_SUCCESS;

}

EXPORT_SYMBOL(migrate_page_move_mapping);



/*

 * The expected number of remaining references is the same as that
@@ -586,6 +587,7 @@ void migrate_page_copy(struct page *newpage, struct page *page) 


	mem_cgroup_migrate(page, newpage);

}

EXPORT_SYMBOL(migrate_page_copy);



/************************************************************

 *                    Migration functions