The patch titled
Subject: filemap: find_lock_entries() now updates start offset
has been added to the -mm mm-unstable branch. Its filename is
filemap-find_lock_entries-now-updates-start-offset.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/filemap-find_lock_entries-now-updates-start-offset.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Vishal Moola (Oracle)" <vishal.moola@xxxxxxxxx>
Subject: filemap: find_lock_entries() now updates start offset
Date: Mon, 17 Oct 2022 09:17:59 -0700
Patch series "Rework find_get_entries() and find_lock_entries()", v3.
Originally the callers of find_get_entries() and find_lock_entries() were
keeping track of the start index themselves as they traverse the search
range.
This resulted in hacky code such as in shmem_undo_range():
index = folio->index + folio_nr_pages(folio) - 1;
where the - 1 is only present to stay in the right spot after incrementing
index later. This sort of calculation was also being done on every folio
despite not even using index later within that function.
These patches change find_get_entries() and find_lock_entries() to
calculate the new index instead of leaving it to the callers so we can
avoid all these complications.
This patch (of 2):
Initially, find_lock_entries() was being passed in the start offset as a
value. That left the calculation of the offset to the callers. This led
to complexity in the callers trying to keep track of the index.
Now find_lock_entries() takes in a pointer to the start offset and updates
the value to be directly after the last entry found. If no entry is
found, the offset is not changed. This gets rid of multiple hacky
calculations that kept track of the start offset.
Link: https://lkml.kernel.org/r/20221017161800.2003-1-vishal.moola@xxxxxxxxx
Link: https://lkml.kernel.org/r/20221017161800.2003-2-vishal.moola@xxxxxxxxx
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/filemap.c | 15 ++++++++++++---
mm/internal.h | 2 +-
mm/shmem.c | 8 ++------
mm/truncate.c | 11 +++--------
4 files changed, 18 insertions(+), 18 deletions(-)
--- a/mm/filemap.c~filemap-find_lock_entries-now-updates-start-offset
+++ a/mm/filemap.c
@@ -2085,16 +2085,16 @@ unsigned find_get_entries(struct address
*
* Return: The number of entries which were found.
*/
-unsigned find_lock_entries(struct address_space *mapping, pgoff_t start,
+unsigned find_lock_entries(struct address_space *mapping, pgoff_t *start,
pgoff_t end, struct folio_batch *fbatch, pgoff_t *indices)
{
- XA_STATE(xas, &mapping->i_pages, start);
+ XA_STATE(xas, &mapping->i_pages, *start);
struct folio *folio;
rcu_read_lock();
while ((folio = find_get_entry(&xas, end, XA_PRESENT))) {
if (!xa_is_value(folio)) {
- if (folio->index < start)
+ if (folio->index < *start)
goto put;
if (folio->index + folio_nr_pages(folio) - 1 > end)
goto put;
@@ -2117,6 +2117,15 @@ put:
}
rcu_read_unlock();
+ if (folio_batch_count(fbatch)) {
+ unsigned long nr = 1;
+ int idx = folio_batch_count(fbatch) - 1;
+
+ folio = fbatch->folios[idx];
+ if (!xa_is_value(folio) && !folio_test_hugetlb(folio))
+ nr = folio_nr_pages(folio);
+ *start = indices[idx] + nr;
+ }
return folio_batch_count(fbatch);
}
--- a/mm/internal.h~filemap-find_lock_entries-now-updates-start-offset
+++ a/mm/internal.h
@@ -106,7 +106,7 @@ static inline void force_page_cache_read
force_page_cache_ra(&ractl, nr_to_read);
}
-unsigned find_lock_entries(struct address_space *mapping, pgoff_t start,
+unsigned find_lock_entries(struct address_space *mapping, pgoff_t *start,
pgoff_t end, struct folio_batch *fbatch, pgoff_t *indices);
unsigned find_get_entries(struct address_space *mapping, pgoff_t start,
pgoff_t end, struct folio_batch *fbatch, pgoff_t *indices);
--- a/mm/shmem.c~filemap-find_lock_entries-now-updates-start-offset
+++ a/mm/shmem.c
@@ -922,21 +922,18 @@ static void shmem_undo_range(struct inod
folio_batch_init(&fbatch);
index = start;
- while (index < end && find_lock_entries(mapping, index, end - 1,
+ while (index < end && find_lock_entries(mapping, &index, end - 1,
&fbatch, indices)) {
for (i = 0; i < folio_batch_count(&fbatch); i++) {
folio = fbatch.folios[i];
- index = indices[i];
-
if (xa_is_value(folio)) {
if (unfalloc)
continue;
nr_swaps_freed += !shmem_free_swap(mapping,
- index, folio);
+ indices[i], folio);
continue;
}
- index += folio_nr_pages(folio) - 1;
if (!unfalloc || !folio_test_uptodate(folio))
truncate_inode_folio(mapping, folio);
@@ -945,7 +942,6 @@ static void shmem_undo_range(struct inod
folio_batch_remove_exceptionals(&fbatch);
folio_batch_release(&fbatch);
cond_resched();
- index++;
}
same_folio = (lstart >> PAGE_SHIFT) == (lend >> PAGE_SHIFT);
--- a/mm/truncate.c~filemap-find_lock_entries-now-updates-start-offset
+++ a/mm/truncate.c
@@ -361,9 +361,8 @@ void truncate_inode_pages_range(struct a
folio_batch_init(&fbatch);
index = start;
- while (index < end && find_lock_entries(mapping, index, end - 1,
+ while (index < end && find_lock_entries(mapping, &index, end - 1,
&fbatch, indices)) {
- index = indices[folio_batch_count(&fbatch) - 1] + 1;
truncate_folio_batch_exceptionals(mapping, &fbatch, indices);
for (i = 0; i < folio_batch_count(&fbatch); i++)
truncate_cleanup_folio(fbatch.folios[i]);
@@ -510,20 +509,17 @@ unsigned long invalidate_mapping_pagevec
int i;
folio_batch_init(&fbatch);
- while (find_lock_entries(mapping, index, end, &fbatch, indices)) {
+ while (find_lock_entries(mapping, &index, end, &fbatch, indices)) {
for (i = 0; i < folio_batch_count(&fbatch); i++) {
struct folio *folio = fbatch.folios[i];
/* We rely upon deletion not changing folio->index */
- index = indices[i];
if (xa_is_value(folio)) {
count += invalidate_exceptional_entry(mapping,
- index,
- folio);
+ indices[i], folio);
continue;
}
- index += folio_nr_pages(folio) - 1;
ret = mapping_evict_folio(mapping, folio);
folio_unlock(folio);
@@ -542,7 +538,6 @@ unsigned long invalidate_mapping_pagevec
folio_batch_remove_exceptionals(&fbatch);
folio_batch_release(&fbatch);
cond_resched();
- index++;
}
return count;
}
_
Patches currently in -mm which might be from vishal.moola@xxxxxxxxx are
filemap-find_lock_entries-now-updates-start-offset.patch
filemap-find_get_entries-now-updates-start-offset.patch
