http://people.redhat.com/esandeen/livecd-creator-imagefile.bz2 contains an image (for now) which, when resized to 578639, corrupts the filesystem. This is a bit crazy, I guess, because the fs currently has only 1 free block, but still, we should be graceful about the failure. Perhaps it would make sense to check the requested valuea against the minimum value resize2fs would compute for "-P" and fail (at least without a force). But in any case, this exposed 2 bugs when moving that one block required an extent split, which is what hit the ENOSPC. For starters, ext2fs_extent_set_bmap() in the "(re/un)mapping last block in extent" case was replacing the old extent before the new one was created; when the new extent creation failed, it left us in an inconsistent state. Simply changing the order of the two should fix this problem. Next, ext2fs_extent_insert was calling ext2fs_extent_delete() on *any* error, including one caused by failure to allocate a new block to split the node to hold that extent ... the handle was left unchanged, and we deleted the -original- extent. As a quick fix for this, just don't do the delete if we fail the split, though this may need to be smarter. I don't think we have terribly consistent behavior about where a handle is left on various errors. v2: lose the goto change complexity Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx> --- diff --git a/lib/ext2fs/extent.c b/lib/ext2fs/extent.c index 143929e..ddb2d2a 100644 --- a/lib/ext2fs/extent.c +++ b/lib/ext2fs/extent.c @@ -1040,7 +1040,7 @@ errcode_t ext2fs_extent_insert(ext2_extent_handle_t handle, int flags, #endif retval = extent_node_split(handle); if (retval) - goto errout; + return retval; path = handle->path + handle->level; } } @@ -1239,16 +1239,17 @@ again: #ifdef DEBUG printf("(re/un)mapping last block in extent\n"); #endif - extent.e_len--; - retval = ext2fs_extent_replace(handle, 0, &extent); - if (retval) - goto done; + /* Make sure insert works before replacing old extent */ if (physical) { retval = ext2fs_extent_insert(handle, EXT2_EXTENT_INSERT_AFTER, &newextent); if (retval) goto done; } + extent.e_len--; + retval = ext2fs_extent_replace(handle, 0, &extent); + if (retval) + goto done; } else if (logical == extent.e_lblk) { #ifdef DEBUG printf("(re/un)mapping first block in extent\n"); -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
