| Message ID | 20170317020634.29287-1-quwenruo@cn.fujitsu.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Introduce a new image, which contains external SHARED_DATA_REF items to
trigger a lowmem mode false alert.
The image only contains external SHARED_DATA_REF and no inlined data
backref.
Before the image, we only have inlined shared data ref, which is not
enough to trigger lowmem mode false alert.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
---
.../020-extent-ref-cases/shared_data_ref_only.img | Bin 0 -> 7168 bytes
1 file changed, 0 insertions(+), 0 deletions(-)
create mode 100644 tests/fsck-tests/020-extent-ref-cases/shared_data_ref_only.img
diff --git a/tests/fsck-tests/020-extent-ref-cases/shared_data_ref_only.img b/tests/fsck-tests/020-extent-ref-cases/shared_data_ref_only.img
new file mode 100644
index 0000000000000000000000000000000000000000..6d2b95e475188dba11fb4cd0996701e0a09bbf82
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On Fri, Mar 17, 2017 at 10:06:33AM +0800, Qu Wenruo wrote: > In check_extent_data_item(), after checking extent item of one data > extent, we search inlined data backref, then EXTENT_DATA_REF_KEY. > > But we didn't search SHARED_DATA_REF, so if the backref is > SHARED_DATA_REF, then we will raise a false alert about backref lost. > > Fix by also checking SHARED_DATA_REF_KEY in check_extent_data_item(). > > Reported-by: Chris Murphy <chris@colorremedies.com> > Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Both applied, thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/cmds-check.c b/cmds-check.c index 5cc84690..17b7efbf 100644 --- a/cmds-check.c +++ b/cmds-check.c @@ -10229,10 +10229,8 @@ static int check_extent_data_item(struct btrfs_root *root, dbref_key.offset = btrfs_file_extent_disk_num_bytes(eb, fi); ret = btrfs_search_slot(NULL, extent_root, &dbref_key, &path, 0, 0); - if (ret) { - err |= BACKREF_MISSING; - goto error; - } + if (ret) + goto out; leaf = path.nodes[0]; slot = path.slots[0]; @@ -10273,11 +10271,10 @@ static int check_extent_data_item(struct btrfs_root *root, ptr += btrfs_extent_inline_ref_size(type); } - /* Didn't found inlined data backref, try EXTENT_DATA_REF_KEY */ if (!found_dbackref) { btrfs_release_path(&path); - btrfs_init_path(&path); + /* Didn't find inlined data backref, try EXTENT_DATA_REF_KEY */ dbref_key.objectid = btrfs_file_extent_disk_bytenr(eb, fi); dbref_key.type = BTRFS_EXTENT_DATA_REF_KEY; dbref_key.offset = hash_extent_data_ref(root->objectid, @@ -10285,13 +10282,32 @@ static int check_extent_data_item(struct btrfs_root *root, ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &dbref_key, &path, 0, 0); - if (!ret) + if (!ret) { found_dbackref = 1; + goto out; + } + + btrfs_release_path(&path); + + /* + * Neither inlined nor EXTENT_DATA_REF found, try + * SHARED_DATA_REF as last chance. + */ + dbref_key.objectid = disk_bytenr; + dbref_key.type = BTRFS_SHARED_DATA_REF_KEY; + dbref_key.offset = eb->start; + + ret = btrfs_search_slot(NULL, root->fs_info->extent_root, + &dbref_key, &path, 0, 0); + if (!ret) { + found_dbackref = 1; + goto out; + } } +out: if (!found_dbackref) err |= BACKREF_MISSING; -error: btrfs_release_path(&path); if (err & BACKREF_MISSING) { error("data extent[%llu %llu] backref lost",
In check_extent_data_item(), after checking extent item of one data extent, we search inlined data backref, then EXTENT_DATA_REF_KEY. But we didn't search SHARED_DATA_REF, so if the backref is SHARED_DATA_REF, then we will raise a false alert about backref lost. Fix by also checking SHARED_DATA_REF_KEY in check_extent_data_item(). Reported-by: Chris Murphy <chris@colorremedies.com> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> --- cmds-check.c | 32 ++++++++++++++++++++++++-------- 1 file changed, 24 insertions(+), 8 deletions(-)