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| author | Ira Weiny <ira.weiny@intel.com> | 2021-02-17 03:48:26 +0100 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2021-04-19 17:25:16 +0200 |
| commit | 9a002d531b30bfe81d900f61a5ca955a85fab0e6 (patch) | |
| tree | 986a63d584cc02dc61dbf6c17692a7d8d9f59cef | |
| parent | btrfs: integrity-checker: use kmap_local_page in __btrfsic_submit_bio (diff) | |
| download | linux-9a002d531b30bfe81d900f61a5ca955a85fab0e6.tar.xz linux-9a002d531b30bfe81d900f61a5ca955a85fab0e6.zip | |
btrfs: integrity-checker: convert block context kmap's to kmap_local_page
btrfsic_read_block() (which calls kmap()) and
btrfsic_release_block_ctx() (which calls kunmap()) are always called
within a single thread of execution.
Therefore the mappings created within these calls can be a thread local
mapping.
Convert the kmap() of bloc_ctx->pagev to kmap_local_page(). Luckily the
unmap loops backwards through the array pointer so no adjustment needs
to be made to the unmapping order.
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | fs/btrfs/check-integrity.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c index 6cc8296be030..169508609324 100644 --- a/fs/btrfs/check-integrity.c +++ b/fs/btrfs/check-integrity.c @@ -1555,10 +1555,11 @@ static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx) BUG_ON(!block_ctx->pagev); num_pages = (block_ctx->len + (u64)PAGE_SIZE - 1) >> PAGE_SHIFT; + /* Pages must be unmapped in reverse order */ while (num_pages > 0) { num_pages--; if (block_ctx->datav[num_pages]) { - kunmap(block_ctx->pagev[num_pages]); + kunmap_local(block_ctx->datav[num_pages]); block_ctx->datav[num_pages] = NULL; } if (block_ctx->pagev[num_pages]) { @@ -1637,7 +1638,7 @@ static int btrfsic_read_block(struct btrfsic_state *state, i = j; } for (i = 0; i < num_pages; i++) - block_ctx->datav[i] = kmap(block_ctx->pagev[i]); + block_ctx->datav[i] = kmap_local_page(block_ctx->pagev[i]); return block_ctx->len; } |