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authorFilipe Manana <fdmanana@suse.com>2023-05-09 12:50:02 +0100
committerDavid Sterba <dsterba@suse.com>2023-05-09 22:09:11 +0200
commit0cad8f14d70cfeb5173dce93cafeba665a95430e (patch)
tree6c55275cb42517d7ffeda3a63896281a2c21f87e /fs/btrfs/backref.c
parent0004ff15ea26015a0a3a6182dca3b9d1df32e2b7 (diff)
btrfs: fix backref walking not returning all inode refs
When using the logical to ino ioctl v2, if the flag to ignore offsets of file extent items (BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET) is given, the backref walking code ends up not returning references for all file offsets of an inode that point to the given logical bytenr. This happens since kernel 6.2, commit 6ce6ba534418 ("btrfs: use a single argument for extent offset in backref walking functions") because: 1) It mistakenly skipped the search for file extent items in a leaf that point to the target extent if that flag is given. Instead it should only skip the filtering done by check_extent_in_eb() - that is, it should not avoid the calls to that function (or find_extent_in_eb(), which uses it). 2) It was also not building a list of inode extent elements (struct extent_inode_elem) if we have multiple inode references for an extent when the ignore offset flag is given to the logical to ino ioctl - it would leave a single element, only the last one that was found. These stem from the confusing old interface for backref walking functions where we had an extent item offset argument that was a pointer to a u64 and another boolean argument that indicated if the offset should be ignored, but the pointer could be NULL. That NULL case is used by relocation, qgroup extent accounting and fiemap, simply to avoid building the inode extent list for each reference, as it's not necessary for those use cases and therefore avoids memory allocations and some computations. Fix this by adding a boolean argument to the backref walk context structure to indicate that the inode extent list should not be built, make relocation set that argument to true and fix the backref walking logic to skip the calls to check_extent_in_eb() and find_extent_in_eb() only if this new argument is true, instead of 'ignore_extent_item_pos' being true. A test case for fstests will be added soon, to provide cover not only for these cases but to the logical to ino ioctl in general as well, as currently we do not have a test case for it. Reported-by: Vladimir Panteleev <git@vladimir.panteleev.md> Link: https://lore.kernel.org/linux-btrfs/CAHhfkvwo=nmzrJSqZ2qMfF-rZB-ab6ahHnCD_sq9h4o8v+M7QQ@mail.gmail.com/ Fixes: 6ce6ba534418 ("btrfs: use a single argument for extent offset in backref walking functions") CC: stable@vger.kernel.org # 6.2+ Tested-by: Vladimir Panteleev <git@vladimir.panteleev.md> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/backref.c')
-rw-r--r--fs/btrfs/backref.c19
1 files changed, 10 insertions, 9 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index e54f0884802a..79336fa853db 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -45,7 +45,8 @@ static int check_extent_in_eb(struct btrfs_backref_walk_ctx *ctx,
int root_count;
bool cached;
- if (!btrfs_file_extent_compression(eb, fi) &&
+ if (!ctx->ignore_extent_item_pos &&
+ !btrfs_file_extent_compression(eb, fi) &&
!btrfs_file_extent_encryption(eb, fi) &&
!btrfs_file_extent_other_encoding(eb, fi)) {
u64 data_offset;
@@ -552,7 +553,7 @@ static int add_all_parents(struct btrfs_backref_walk_ctx *ctx,
count++;
else
goto next;
- if (!ctx->ignore_extent_item_pos) {
+ if (!ctx->skip_inode_ref_list) {
ret = check_extent_in_eb(ctx, &key, eb, fi, &eie);
if (ret == BTRFS_ITERATE_EXTENT_INODES_STOP ||
ret < 0)
@@ -564,7 +565,7 @@ static int add_all_parents(struct btrfs_backref_walk_ctx *ctx,
eie, (void **)&old, GFP_NOFS);
if (ret < 0)
break;
- if (!ret && !ctx->ignore_extent_item_pos) {
+ if (!ret && !ctx->skip_inode_ref_list) {
while (old->next)
old = old->next;
old->next = eie;
@@ -1606,7 +1607,7 @@ again:
goto out;
}
if (ref->count && ref->parent) {
- if (!ctx->ignore_extent_item_pos && !ref->inode_list &&
+ if (!ctx->skip_inode_ref_list && !ref->inode_list &&
ref->level == 0) {
struct btrfs_tree_parent_check check = { 0 };
struct extent_buffer *eb;
@@ -1647,7 +1648,7 @@ again:
(void **)&eie, GFP_NOFS);
if (ret < 0)
goto out;
- if (!ret && !ctx->ignore_extent_item_pos) {
+ if (!ret && !ctx->skip_inode_ref_list) {
/*
* We've recorded that parent, so we must extend
* its inode list here.
@@ -1743,7 +1744,7 @@ int btrfs_find_all_leafs(struct btrfs_backref_walk_ctx *ctx)
static int btrfs_find_all_roots_safe(struct btrfs_backref_walk_ctx *ctx)
{
const u64 orig_bytenr = ctx->bytenr;
- const bool orig_ignore_extent_item_pos = ctx->ignore_extent_item_pos;
+ const bool orig_skip_inode_ref_list = ctx->skip_inode_ref_list;
bool roots_ulist_allocated = false;
struct ulist_iterator uiter;
int ret = 0;
@@ -1764,7 +1765,7 @@ static int btrfs_find_all_roots_safe(struct btrfs_backref_walk_ctx *ctx)
roots_ulist_allocated = true;
}
- ctx->ignore_extent_item_pos = true;
+ ctx->skip_inode_ref_list = true;
ULIST_ITER_INIT(&uiter);
while (1) {
@@ -1789,7 +1790,7 @@ static int btrfs_find_all_roots_safe(struct btrfs_backref_walk_ctx *ctx)
ulist_free(ctx->refs);
ctx->refs = NULL;
ctx->bytenr = orig_bytenr;
- ctx->ignore_extent_item_pos = orig_ignore_extent_item_pos;
+ ctx->skip_inode_ref_list = orig_skip_inode_ref_list;
return ret;
}
@@ -1912,7 +1913,7 @@ int btrfs_is_data_extent_shared(struct btrfs_inode *inode, u64 bytenr,
goto out_trans;
}
- walk_ctx.ignore_extent_item_pos = true;
+ walk_ctx.skip_inode_ref_list = true;
walk_ctx.trans = trans;
walk_ctx.fs_info = fs_info;
walk_ctx.refs = &ctx->refs;