logfs: handle powerfail on NAND flash

[sfrench/cifs-2.6.git] / fs / logfs / dev_bdev.c

diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c
index 9718c22f186d04ff309614dbeee6337a8d5ec185..9bd2ce2a30407897557b32a2fa9f97708695593e 100644 (file)
--- a/fs/logfs/dev_bdev.c
+++ b/fs/logfs/dev_bdev.c
@@ -9,6 +9,7 @@
 #include <linux/bio.h>
 #include <linux/blkdev.h>
 #include <linux/buffer_head.h>
+#include <linux/gfp.h>
 
 #define PAGE_OFS(ofs) ((ofs) & (PAGE_SIZE-1))
 
@@ -80,6 +81,7 @@ static void writeseg_end_io(struct bio *bio, int err)
                        prefetchw(&bvec->bv_page->flags);
 
                end_page_writeback(page);
+               page_cache_release(page);
        } while (bvec >= bio->bi_io_vec);
        bio_put(bio);
        if (atomic_dec_and_test(&super->s_pending_writes))
@@ -97,8 +99,10 @@ static int __bdev_writeseg(struct super_block *sb, u64 ofs, pgoff_t index,
        unsigned int max_pages = queue_max_hw_sectors(q) >> (PAGE_SHIFT - 9);
        int i;
 
+       if (max_pages > BIO_MAX_PAGES)
+               max_pages = BIO_MAX_PAGES;
        bio = bio_alloc(GFP_NOFS, max_pages);
-       BUG_ON(!bio); /* FIXME: handle this */
+       BUG_ON(!bio);
 
        for (i = 0; i < nr_pages; i++) {
                if (i >= max_pages) {
@@ -191,8 +195,10 @@ static int do_erase(struct super_block *sb, u64 ofs, pgoff_t index,
        unsigned int max_pages = queue_max_hw_sectors(q) >> (PAGE_SHIFT - 9);
        int i;
 
+       if (max_pages > BIO_MAX_PAGES)
+               max_pages = BIO_MAX_PAGES;
        bio = bio_alloc(GFP_NOFS, max_pages);
-       BUG_ON(!bio); /* FIXME: handle this */
+       BUG_ON(!bio);
 
        for (i = 0; i < nr_pages; i++) {
                if (i >= max_pages) {
@@ -297,6 +303,11 @@ static void bdev_put_device(struct super_block *sb)
        close_bdev_exclusive(logfs_super(sb)->s_bdev, FMODE_READ|FMODE_WRITE);
 }
 
+static int bdev_can_write_buf(struct super_block *sb, u64 ofs)
+{
+       return 0;
+}
+
 static const struct logfs_device_ops bd_devops = {
        .find_first_sb  = bdev_find_first_sb,
        .find_last_sb   = bdev_find_last_sb,
@@ -304,6 +315,7 @@ static const struct logfs_device_ops bd_devops = {
        .readpage       = bdev_readpage,
        .writeseg       = bdev_writeseg,
        .erase          = bdev_erase,
+       .can_write_buf  = bdev_can_write_buf,
        .sync           = bdev_sync,
        .put_device     = bdev_put_device,
 };