summaryrefslogtreecommitdiff
path: root/Documentation/filesystems
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2022-03-22 16:11:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-22 16:11:53 -0700
commit3bf03b9a0839c9fb06927ae53ebd0f960b19d408 (patch)
tree06114247eb7760edca7b57cc0108a351ffe1971b /Documentation/filesystems
parent3fe2f7446f1e029b220f7f650df6d138f91651f2 (diff)
parent15423a52cc84e23bc11e4a903cd775adc7c6ab00 (diff)
downloadlwn-3bf03b9a0839c9fb06927ae53ebd0f960b19d408.tar.gz
lwn-3bf03b9a0839c9fb06927ae53ebd0f960b19d408.zip
Merge branch 'akpm' (patches from Andrew)
Merge updates from Andrew Morton: - A few misc subsystems: kthread, scripts, ntfs, ocfs2, block, and vfs - Most the MM patches which precede the patches in Willy's tree: kasan, pagecache, gup, swap, shmem, memcg, selftests, pagemap, mremap, sparsemem, vmalloc, pagealloc, memory-failure, mlock, hugetlb, userfaultfd, vmscan, compaction, mempolicy, oom-kill, migration, thp, cma, autonuma, psi, ksm, page-poison, madvise, memory-hotplug, rmap, zswap, uaccess, ioremap, highmem, cleanups, kfence, hmm, and damon. * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (227 commits) mm/damon/sysfs: remove repeat container_of() in damon_sysfs_kdamond_release() Docs/ABI/testing: add DAMON sysfs interface ABI document Docs/admin-guide/mm/damon/usage: document DAMON sysfs interface selftests/damon: add a test for DAMON sysfs interface mm/damon/sysfs: support DAMOS stats mm/damon/sysfs: support DAMOS watermarks mm/damon/sysfs: support schemes prioritization mm/damon/sysfs: support DAMOS quotas mm/damon/sysfs: support DAMON-based Operation Schemes mm/damon/sysfs: support the physical address space monitoring mm/damon/sysfs: link DAMON for virtual address spaces monitoring mm/damon: implement a minimal stub for sysfs-based DAMON interface mm/damon/core: add number of each enum type values mm/damon/core: allow non-exclusive DAMON start/stop Docs/damon: update outdated term 'regions update interval' Docs/vm/damon/design: update DAMON-Idle Page Tracking interference handling Docs/vm/damon: call low level monitoring primitives the operations mm/damon: remove unnecessary CONFIG_DAMON option mm/damon/paddr,vaddr: remove damon_{p,v}a_{target_valid,set_operations}() mm/damon/dbgfs-test: fix is_target_id() change ...
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/porting.rst6
-rw-r--r--Documentation/filesystems/vfs.rst16
2 files changed, 16 insertions, 6 deletions
diff --git a/Documentation/filesystems/porting.rst b/Documentation/filesystems/porting.rst
index bf19fd6b86e7..7c1583dbeb59 100644
--- a/Documentation/filesystems/porting.rst
+++ b/Documentation/filesystems/porting.rst
@@ -45,6 +45,12 @@ typically between calling iget_locked() and unlocking the inode.
At some point that will become mandatory.
+**mandatory**
+
+The foo_inode_info should always be allocated through alloc_inode_sb() rather
+than kmem_cache_alloc() or kmalloc() related to set up the inode reclaim context
+correctly.
+
---
**mandatory**
diff --git a/Documentation/filesystems/vfs.rst b/Documentation/filesystems/vfs.rst
index bf5c48066fac..b4a0baa46dcc 100644
--- a/Documentation/filesystems/vfs.rst
+++ b/Documentation/filesystems/vfs.rst
@@ -806,12 +806,16 @@ cache in your filesystem. The following members are defined:
object. The pages are consecutive in the page cache and are
locked. The implementation should decrement the page refcount
after starting I/O on each page. Usually the page will be
- unlocked by the I/O completion handler. If the filesystem decides
- to stop attempting I/O before reaching the end of the readahead
- window, it can simply return. The caller will decrement the page
- refcount and unlock the remaining pages for you. Set PageUptodate
- if the I/O completes successfully. Setting PageError on any page
- will be ignored; simply unlock the page if an I/O error occurs.
+ unlocked by the I/O completion handler. The set of pages are
+ divided into some sync pages followed by some async pages,
+ rac->ra->async_size gives the number of async pages. The
+ filesystem should attempt to read all sync pages but may decide
+ to stop once it reaches the async pages. If it does decide to
+ stop attempting I/O, it can simply return. The caller will
+ remove the remaining pages from the address space, unlock them
+ and decrement the page refcount. Set PageUptodate if the I/O
+ completes successfully. Setting PageError on any page will be
+ ignored; simply unlock the page if an I/O error occurs.
``readpages``
called by the VM to read pages associated with the address_space