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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 ====================
 Changes since 2.5.0:
 ====================
 
 ---
 
 **recommended**
 
 New helpers: sb_bread(), sb_getblk(), sb_find_get_block(), set_bh(),
 sb_set_blocksize() and sb_min_blocksize().
 
 Use them.
 
 (sb_find_get_block() replaces 2.4's get_hash_table())
 
 ---
 
 **recommended**
 
 New methods: ->alloc_inode() and ->destroy_inode().
 
 Remove inode->u.foo_inode_i
 
 Declare::
 
         struct foo_inode_info {
                 /* fs-private stuff */
                 struct inode vfs_inode;
         };
         static inline struct foo_inode_info *FOO_I(struct inode *inode)
         {
                 return list_entry(inode, struct foo_inode_info, vfs_inode);
         }
 
 Use FOO_I(inode) instead of &inode->u.foo_inode_i;
 
 Add foo_alloc_inode() and foo_destroy_inode() - the former should allocate
 foo_inode_info and return the address of ->vfs_inode, the latter should free
 FOO_I(inode) (see in-tree filesystems for examples).
 
 Make them ->alloc_inode and ->destroy_inode in your super_operations.
 
 Keep in mind that now you need explicit initialization of private data
 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**
 
 Change of file_system_type method (->read_super to ->get_sb)
 
 ->read_super() is no more.  Ditto for DECLARE_FSTYPE and DECLARE_FSTYPE_DEV.
 
 Turn your foo_read_super() into a function that would return 0 in case of
 success and negative number in case of error (-EINVAL unless you have more
 informative error value to report).  Call it foo_fill_super().  Now declare::
 
   int foo_get_sb(struct file_system_type *fs_type,
         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
   {
         return get_sb_bdev(fs_type, flags, dev_name, data, foo_fill_super,
                            mnt);
   }
 
 (or similar with s/bdev/nodev/ or s/bdev/single/, depending on the kind of
 filesystem).
 
 Replace DECLARE_FSTYPE... with explicit initializer and have ->get_sb set as
 foo_get_sb.
 
 ---
 
 **mandatory**
 
 Locking change: ->s_vfs_rename_sem is taken only by cross-directory renames.
 Most likely there is no need to change anything, but if you relied on
 global exclusion between renames for some internal purpose - you need to
 change your internal locking.  Otherwise exclusion warranties remain the
 same (i.e. parents and victim are locked, etc.).
 
 ---
 
 **informational**
 
 Now we have the exclusion between ->lookup() and directory removal (by
 ->rmdir() and ->rename()).  If you used to need that exclusion and do
 it by internal locking (most of filesystems couldn't care less) - you
 can relax your locking.
 
 ---
 
 **mandatory**
 
 ->lookup(), ->truncate(), ->create(), ->unlink(), ->mknod(), ->mkdir(),
 ->rmdir(), ->link(), ->lseek(), ->symlink(), ->rename()
 and ->readdir() are called without BKL now.  Grab it on entry, drop upon return
 - that will guarantee the same locking you used to have.  If your method or its
 parts do not need BKL - better yet, now you can shift lock_kernel() and
 unlock_kernel() so that they would protect exactly what needs to be
 protected.
 
 ---
 
 **mandatory**
 
 BKL is also moved from around sb operations. BKL should have been shifted into
 individual fs sb_op functions.  If you don't need it, remove it.
 
 ---
 
 **informational**
 
 check for ->link() target not being a directory is done by callers.  Feel
 free to drop it...
 
 ---
 
 **informational**
 
 ->link() callers hold ->i_mutex on the object we are linking to.  Some of your
 problems might be over...
 
 ---
 
 **mandatory**
 
 new file_system_type method - kill_sb(superblock).  If you are converting
 an existing filesystem, set it according to ->fs_flags::
 
         FS_REQUIRES_DEV         -       kill_block_super
         FS_LITTER               -       kill_litter_super
         neither                 -       kill_anon_super
 
 FS_LITTER is gone - just remove it from fs_flags.
 
 ---
 
 **mandatory**
 
 FS_SINGLE is gone (actually, that had happened back when ->get_sb()
 went in - and hadn't been documented ;-/).  Just remove it from fs_flags
 (and see ->get_sb() entry for other actions).
 
 ---
 
 **mandatory**
 
 ->setattr() is called without BKL now.  Caller _always_ holds ->i_mutex, so
 watch for ->i_mutex-grabbing code that might be used by your ->setattr().
 Callers of notify_change() need ->i_mutex now.
 
 ---
 
 **recommended**
 
 New super_block field ``struct export_operations *s_export_op`` for
 explicit support for exporting, e.g. via NFS.  The structure is fully
 documented at its declaration in include/linux/fs.h, and in
 Documentation/filesystems/nfs/exporting.rst.
 
 Briefly it allows for the definition of decode_fh and encode_fh operations
 to encode and decode filehandles, and allows the filesystem to use
 a standard helper function for decode_fh, and provide file-system specific
 support for this helper, particularly get_parent.
 
 It is planned that this will be required for exporting once the code
 settles down a bit.
 
 **mandatory**
 
 s_export_op is now required for exporting a filesystem.
 isofs, ext2, ext3, resierfs, fat
 can be used as examples of very different filesystems.
 
 ---
 
 **mandatory**
 
 iget4() and the read_inode2 callback have been superseded by iget5_locked()
 which has the following prototype::
 
     struct inode *iget5_locked(struct super_block *sb, unsigned long ino,
                                 int (*test)(struct inode *, void *),
                                 int (*set)(struct inode *, void *),
                                 void *data);
 
 'test' is an additional function that can be used when the inode
 number is not sufficient to identify the actual file object. 'set'
 should be a non-blocking function that initializes those parts of a
 newly created inode to allow the test function to succeed. 'data' is
 passed as an opaque value to both test and set functions.
 
 When the inode has been created by iget5_locked(), it will be returned with the
 I_NEW flag set and will still be locked.  The filesystem then needs to finalize
 the initialization. Once the inode is initialized it must be unlocked by
 calling unlock_new_inode().
 
 The filesystem is responsible for setting (and possibly testing) i_ino
 when appropriate. There is also a simpler iget_locked function that
 just takes the superblock and inode number as arguments and does the
 test and set for you.
 
 e.g.::
 
         inode = iget_locked(sb, ino);
         if (inode->i_state & I_NEW) {
                 err = read_inode_from_disk(inode);
                 if (err < 0) {
                         iget_failed(inode);
                         return err;
                 }
                 unlock_new_inode(inode);
         }
 
 Note that if the process of setting up a new inode fails, then iget_failed()
 should be called on the inode to render it dead, and an appropriate error
 should be passed back to the caller.
 
 ---
 
 **recommended**
 
 ->getattr() finally getting used.  See instances in nfs, minix, etc.
 
 ---
 
 **mandatory**
 
 ->revalidate() is gone.  If your filesystem had it - provide ->getattr()
 and let it call whatever you had as ->revlidate() + (for symlinks that
 had ->revalidate()) add calls in ->follow_link()/->readlink().
 
 ---
 
 **mandatory**
 
 ->d_parent changes are not protected by BKL anymore.  Read access is safe
 if at least one of the following is true:
 
         * filesystem has no cross-directory rename()
         * we know that parent had been locked (e.g. we are looking at
           ->d_parent of ->lookup() argument).
         * we are called from ->rename().
         * the child's ->d_lock is held
 
 Audit your code and add locking if needed.  Notice that any place that is
 not protected by the conditions above is risky even in the old tree - you
 had been relying on BKL and that's prone to screwups.  Old tree had quite
 a few holes of that kind - unprotected access to ->d_parent leading to
 anything from oops to silent memory corruption.
 
 ---
 
 **mandatory**
 
 FS_NOMOUNT is gone.  If you use it - just set SB_NOUSER in flags
 (see rootfs for one kind of solution and bdev/socket/pipe for another).
 
 ---
 
 **recommended**
 
 Use bdev_read_only(bdev) instead of is_read_only(kdev).  The latter
 is still alive, but only because of the mess in drivers/s390/block/dasd.c.
 As soon as it gets fixed is_read_only() will die.
 
 ---
 
 **mandatory**
 
 ->permission() is called without BKL now. Grab it on entry, drop upon
 return - that will guarantee the same locking you used to have.  If
 your method or its parts do not need BKL - better yet, now you can
 shift lock_kernel() and unlock_kernel() so that they would protect
 exactly what needs to be protected.
 
 ---
 
 **mandatory**
 
 ->statfs() is now called without BKL held.  BKL should have been
 shifted into individual fs sb_op functions where it's not clear that
 it's safe to remove it.  If you don't need it, remove it.
 
 ---
 
 **mandatory**
 
 is_read_only() is gone; use bdev_read_only() instead.
 
 ---
 
 **mandatory**
 
 destroy_buffers() is gone; use invalidate_bdev().
 
 ---
 
 **mandatory**
 
 fsync_dev() is gone; use fsync_bdev().  NOTE: lvm breakage is
 deliberate; as soon as struct block_device * is propagated in a reasonable
 way by that code fixing will become trivial; until then nothing can be
 done.
 
 **mandatory**
 
 block truncatation on error exit from ->write_begin, and ->direct_IO
 moved from generic methods (block_write_begin, cont_write_begin,
 nobh_write_begin, blockdev_direct_IO*) to callers.  Take a look at
 ext2_write_failed and callers for an example.
 
 **mandatory**
 
 ->truncate is gone.  The whole truncate sequence needs to be
 implemented in ->setattr, which is now mandatory for filesystems
 implementing on-disk size changes.  Start with a copy of the old inode_setattr
 and vmtruncate, and the reorder the vmtruncate + foofs_vmtruncate sequence to
 be in order of zeroing blocks using block_truncate_page or similar helpers,
 size update and on finally on-disk truncation which should not fail.
 setattr_prepare (which used to be inode_change_ok) now includes the size checks
 for ATTR_SIZE and must be called in the beginning of ->setattr unconditionally.
 
 **mandatory**
 
 ->clear_inode() and ->delete_inode() are gone; ->evict_inode() should
 be used instead.  It gets called whenever the inode is evicted, whether it has
 remaining links or not.  Caller does *not* evict the pagecache or inode-associated
 metadata buffers; the method has to use truncate_inode_pages_final() to get rid
 of those. Caller makes sure async writeback cannot be running for the inode while
 (or after) ->evict_inode() is called.
 
 ->drop_inode() returns int now; it's called on final iput() with
 inode->i_lock held and it returns true if filesystems wants the inode to be
 dropped.  As before, generic_drop_inode() is still the default and it's been
 updated appropriately.  generic_delete_inode() is also alive and it consists
 simply of return 1.  Note that all actual eviction work is done by caller after
 ->drop_inode() returns.
 
 As before, clear_inode() must be called exactly once on each call of
 ->evict_inode() (as it used to be for each call of ->delete_inode()).  Unlike
 before, if you are using inode-associated metadata buffers (i.e.
 mark_buffer_dirty_inode()), it's your responsibility to call
 invalidate_inode_buffers() before clear_inode().
 
 NOTE: checking i_nlink in the beginning of ->write_inode() and bailing out
 if it's zero is not *and* *never* *had* *been* enough.  Final unlink() and iput()
 may happen while the inode is in the middle of ->write_inode(); e.g. if you blindly
 free the on-disk inode, you may end up doing that while ->write_inode() is writing
 to it.
 
 ---
 
 **mandatory**
 
 .d_delete() now only advises the dcache as to whether or not to cache
 unreferenced dentries, and is now only called when the dentry refcount goes to
 0. Even on 0 refcount transition, it must be able to tolerate being called 0,
 1, or more times (eg. constant, idempotent).
 
 ---
 
 **mandatory**
 
 .d_compare() calling convention and locking rules are significantly
 changed. Read updated documentation in Documentation/filesystems/vfs.rst (and
 look at examples of other filesystems) for guidance.
 
 ---
 
 **mandatory**
 
 .d_hash() calling convention and locking rules are significantly
 changed. Read updated documentation in Documentation/filesystems/vfs.rst (and
 look at examples of other filesystems) for guidance.
 
 ---
 
 **mandatory**
 
 dcache_lock is gone, replaced by fine grained locks. See fs/dcache.c
 for details of what locks to replace dcache_lock with in order to protect
 particular things. Most of the time, a filesystem only needs ->d_lock, which
 protects *all* the dcache state of a given dentry.
 
 ---
 
 **mandatory**
 
 Filesystems must RCU-free their inodes, if they can have been accessed
 via rcu-walk path walk (basically, if the file can have had a path name in the
 vfs namespace).
 
 Even though i_dentry and i_rcu share storage in a union, we will
 initialize the former in inode_init_always(), so just leave it alone in
 the callback.  It used to be necessary to clean it there, but not anymore
 (starting at 3.2).
 
 ---
 
 **recommended**
 
 vfs now tries to do path walking in "rcu-walk mode", which avoids
 atomic operations and scalability hazards on dentries and inodes (see
 Documentation/filesystems/path-lookup.txt). d_hash and d_compare changes
 (above) are examples of the changes required to support this. For more complex
 filesystem callbacks, the vfs drops out of rcu-walk mode before the fs call, so
 no changes are required to the filesystem. However, this is costly and loses
 the benefits of rcu-walk mode. We will begin to add filesystem callbacks that
 are rcu-walk aware, shown below. Filesystems should take advantage of this
 where possible.
 
 ---
 
 **mandatory**
 
 d_revalidate is a callback that is made on every path element (if
 the filesystem provides it), which requires dropping out of rcu-walk mode. This
 may now be called in rcu-walk mode (nd->flags & LOOKUP_RCU). -ECHILD should be
 returned if the filesystem cannot handle rcu-walk. See
 Documentation/filesystems/vfs.rst for more details.
 
 permission is an inode permission check that is called on many or all
 directory inodes on the way down a path walk (to check for exec permission). It
 must now be rcu-walk aware (mask & MAY_NOT_BLOCK).  See
 Documentation/filesystems/vfs.rst for more details.
 
 ---
 
 **mandatory**
 
 In ->fallocate() you must check the mode option passed in.  If your
 filesystem does not support hole punching (deallocating space in the middle of a
 file) you must return -EOPNOTSUPP if FALLOC_FL_PUNCH_HOLE is set in mode.
 Currently you can only have FALLOC_FL_PUNCH_HOLE with FALLOC_FL_KEEP_SIZE set,
 so the i_size should not change when hole punching, even when puching the end of
 a file off.
 
 ---
 
 **mandatory**
 
 ->get_sb() is gone.  Switch to use of ->mount().  Typically it's just
 a matter of switching from calling ``get_sb_``... to ``mount_``... and changing
 the function type.  If you were doing it manually, just switch from setting
 ->mnt_root to some pointer to returning that pointer.  On errors return
 ERR_PTR(...).
 
 ---
 
 **mandatory**
 
 ->permission() and generic_permission()have lost flags
 argument; instead of passing IPERM_FLAG_RCU we add MAY_NOT_BLOCK into mask.
 
 generic_permission() has also lost the check_acl argument; ACL checking
 has been taken to VFS and filesystems need to provide a non-NULL ->i_op->get_acl
 to read an ACL from disk.
 
 ---
 
 **mandatory**
 
 If you implement your own ->llseek() you must handle SEEK_HOLE and
 SEEK_DATA.  You can hanle this by returning -EINVAL, but it would be nicer to
 support it in some way.  The generic handler assumes that the entire file is
 data and there is a virtual hole at the end of the file.  So if the provided
 offset is less than i_size and SEEK_DATA is specified, return the same offset.
 If the above is true for the offset and you are given SEEK_HOLE, return the end
 of the file.  If the offset is i_size or greater return -ENXIO in either case.
 
 **mandatory**
 
 If you have your own ->fsync() you must make sure to call
 filemap_write_and_wait_range() so that all dirty pages are synced out properly.
 You must also keep in mind that ->fsync() is not called with i_mutex held
 anymore, so if you require i_mutex locking you must make sure to take it and
 release it yourself.
 
 ---
 
 **mandatory**
 
 d_alloc_root() is gone, along with a lot of bugs caused by code
 misusing it.  Replacement: d_make_root(inode).  On success d_make_root(inode)
 allocates and returns a new dentry instantiated with the passed in inode.
 On failure NULL is returned and the passed in inode is dropped so the reference
 to inode is consumed in all cases and failure handling need not do any cleanup
 for the inode.  If d_make_root(inode) is passed a NULL inode it returns NULL
 and also requires no further error handling. Typical usage is::
 
         inode = foofs_new_inode(....);
         s->s_root = d_make_root(inode);
         if (!s->s_root)
                 /* Nothing needed for the inode cleanup */
                 return -ENOMEM;
         ...
 
 ---
 
 **mandatory**
 
 The witch is dead!  Well, 2/3 of it, anyway.  ->d_revalidate() and
 ->lookup() do *not* take struct nameidata anymore; just the flags.
 
 ---
 
 **mandatory**
 
 ->create() doesn't take ``struct nameidata *``; unlike the previous
 two, it gets "is it an O_EXCL or equivalent?" boolean argument.  Note that
 local filesystems can ignore tha argument - they are guaranteed that the
 object doesn't exist.  It's remote/distributed ones that might care...
 
 ---
 
 **mandatory**
 
 FS_REVAL_DOT is gone; if you used to have it, add ->d_weak_revalidate()
 in your dentry operations instead.
 
 ---
 
 **mandatory**
 
 vfs_readdir() is gone; switch to iterate_dir() instead
 
 ---
 
 **mandatory**
 
 ->readdir() is gone now; switch to ->iterate()
 
 **mandatory**
 
 vfs_follow_link has been removed.  Filesystems must use nd_set_link
 from ->follow_link for normal symlinks, or nd_jump_link for magic
 /proc/<pid> style links.
 
 ---
 
 **mandatory**
 
 iget5_locked()/ilookup5()/ilookup5_nowait() test() callback used to be
 called with both ->i_lock and inode_hash_lock held; the former is *not*
 taken anymore, so verify that your callbacks do not rely on it (none
 of the in-tree instances did).  inode_hash_lock is still held,
 of course, so they are still serialized wrt removal from inode hash,
 as well as wrt set() callback of iget5_locked().
 
 ---
 
 **mandatory**
 
 d_materialise_unique() is gone; d_splice_alias() does everything you
 need now.  Remember that they have opposite orders of arguments ;-/
 
 ---
 
 **mandatory**
 
 f_dentry is gone; use f_path.dentry, or, better yet, see if you can avoid
 it entirely.
 
 ---
 
 **mandatory**
 
 never call ->read() and ->write() directly; use __vfs_{read,write} or
 wrappers; instead of checking for ->write or ->read being NULL, look for
 FMODE_CAN_{WRITE,READ} in file->f_mode.
 
 ---
 
 **mandatory**
 
 do _not_ use new_sync_{read,write} for ->read/->write; leave it NULL
 instead.
 
 ---
 
 **mandatory**
         ->aio_read/->aio_write are gone.  Use ->read_iter/->write_iter.
 
 ---
 
 **recommended**
 
 for embedded ("fast") symlinks just set inode->i_link to wherever the
 symlink body is and use simple_follow_link() as ->follow_link().
 
 ---
 
 **mandatory**
 
 calling conventions for ->follow_link() have changed.  Instead of returning
 cookie and using nd_set_link() to store the body to traverse, we return
 the body to traverse and store the cookie using explicit void ** argument.
 nameidata isn't passed at all - nd_jump_link() doesn't need it and
 nd_[gs]et_link() is gone.
 
 ---
 
 **mandatory**
 
 calling conventions for ->put_link() have changed.  It gets inode instead of
 dentry,  it does not get nameidata at all and it gets called only when cookie
 is non-NULL.  Note that link body isn't available anymore, so if you need it,
 store it as cookie.
 
 ---
 
 **mandatory**
 
 any symlink that might use page_follow_link_light/page_put_link() must
 have inode_nohighmem(inode) called before anything might start playing with
 its pagecache.  No highmem pages should end up in the pagecache of such
 symlinks.  That includes any preseeding that might be done during symlink
 creation.  page_symlink() will honour the mapping gfp flags, so once
 you've done inode_nohighmem() it's safe to use, but if you allocate and
 insert the page manually, make sure to use the right gfp flags.
 
 ---
 
 **mandatory**
 
 ->follow_link() is replaced with ->get_link(); same API, except that
 
         * ->get_link() gets inode as a separate argument
         * ->get_link() may be called in RCU mode - in that case NULL
           dentry is passed
 
 ---
 
 **mandatory**
 
 ->get_link() gets struct delayed_call ``*done`` now, and should do
 set_delayed_call() where it used to set ``*cookie``.
 
 ->put_link() is gone - just give the destructor to set_delayed_call()
 in ->get_link().
 
 ---
 
 **mandatory**
 
 ->getxattr() and xattr_handler.get() get dentry and inode passed separately.
 dentry might be yet to be attached to inode, so do _not_ use its ->d_inode
 in the instances.  Rationale: !@#!@# security_d_instantiate() needs to be
 called before we attach dentry to inode.
 
 ---
 
 **mandatory**
 
 symlinks are no longer the only inodes that do *not* have i_bdev/i_cdev/
 i_pipe/i_link union zeroed out at inode eviction.  As the result, you can't
 assume that non-NULL value in ->i_nlink at ->destroy_inode() implies that
 it's a symlink.  Checking ->i_mode is really needed now.  In-tree we had
 to fix shmem_destroy_callback() that used to take that kind of shortcut;
 watch out, since that shortcut is no longer valid.
 
 ---
 
 **mandatory**
 
 ->i_mutex is replaced with ->i_rwsem now.  inode_lock() et.al. work as
 they used to - they just take it exclusive.  However, ->lookup() may be
 called with parent locked shared.  Its instances must not
 
         * use d_instantiate) and d_rehash() separately - use d_add() or
           d_splice_alias() instead.
         * use d_rehash() alone - call d_add(new_dentry, NULL) instead.
         * in the unlikely case when (read-only) access to filesystem
           data structures needs exclusion for some reason, arrange it
           yourself.  None of the in-tree filesystems needed that.
         * rely on ->d_parent and ->d_name not changing after dentry has
           been fed to d_add() or d_splice_alias().  Again, none of the
           in-tree instances relied upon that.
 
 We are guaranteed that lookups of the same name in the same directory
 will not happen in parallel ("same" in the sense of your ->d_compare()).
 Lookups on different names in the same directory can and do happen in
 parallel now.
 
 ---
 
 **recommended**
 
 ->iterate_shared() is added; it's a parallel variant of ->iterate().
 Exclusion on struct file level is still provided (as well as that
 between it and lseek on the same struct file), but if your directory
 has been opened several times, you can get these called in parallel.
 Exclusion between that method and all directory-modifying ones is
 still provided, of course.
 
 Often enough ->iterate() can serve as ->iterate_shared() without any
 changes - it is a read-only operation, after all.  If you have any
 per-inode or per-dentry in-core data structures modified by ->iterate(),
 you might need something to serialize the access to them.  If you
 do dcache pre-seeding, you'll need to switch to d_alloc_parallel() for
 that; look for in-tree examples.
 
 Old method is only used if the new one is absent; eventually it will
 be removed.  Switch while you still can; the old one won't stay.
 
 ---
 
 **mandatory**
 
 ->atomic_open() calls without O_CREAT may happen in parallel.
 
 ---
 
 **mandatory**
 
 ->setxattr() and xattr_handler.set() get dentry and inode passed separately.
 The xattr_handler.set() gets passed the user namespace of the mount the inode
 is seen from so filesystems can idmap the i_uid and i_gid accordingly.
 dentry might be yet to be attached to inode, so do _not_ use its ->d_inode
 in the instances.  Rationale: !@#!@# security_d_instantiate() needs to be
 called before we attach dentry to inode and !@#!@##!@$!$#!@#$!@$!@$ smack
 ->d_instantiate() uses not just ->getxattr() but ->setxattr() as well.
 
 ---
 
 **mandatory**
 
 ->d_compare() doesn't get parent as a separate argument anymore.  If you
 used it for finding the struct super_block involved, dentry->d_sb will
 work just as well; if it's something more complicated, use dentry->d_parent.
 Just be careful not to assume that fetching it more than once will yield
 the same value - in RCU mode it could change under you.
 
 ---
 
 **mandatory**
 
 ->rename() has an added flags argument.  Any flags not handled by the
 filesystem should result in EINVAL being returned.
 
 ---
 
 
 **recommended**
 
 ->readlink is optional for symlinks.  Don't set, unless filesystem needs
 to fake something for readlink(2).
 
 ---
 
 **mandatory**
 
 ->getattr() is now passed a struct path rather than a vfsmount and
 dentry separately, and it now has request_mask and query_flags arguments
 to specify the fields and sync type requested by statx.  Filesystems not
 supporting any statx-specific features may ignore the new arguments.
 
 ---
 
 **mandatory**
 
 ->atomic_open() calling conventions have changed.  Gone is ``int *opened``,
 along with FILE_OPENED/FILE_CREATED.  In place of those we have
 FMODE_OPENED/FMODE_CREATED, set in file->f_mode.  Additionally, return
 value for 'called finish_no_open(), open it yourself' case has become
 0, not 1.  Since finish_no_open() itself is returning 0 now, that part
 does not need any changes in ->atomic_open() instances.
 
 ---
 
 **mandatory**
 
 alloc_file() has become static now; two wrappers are to be used instead.
 alloc_file_pseudo(inode, vfsmount, name, flags, ops) is for the cases
 when dentry needs to be created; that's the majority of old alloc_file()
 users.  Calling conventions: on success a reference to new struct file
 is returned and callers reference to inode is subsumed by that.  On
 failure, ERR_PTR() is returned and no caller's references are affected,
 so the caller needs to drop the inode reference it held.
 alloc_file_clone(file, flags, ops) does not affect any caller's references.
 On success you get a new struct file sharing the mount/dentry with the
 original, on failure - ERR_PTR().
 
 ---
 
 **mandatory**
 
 ->clone_file_range() and ->dedupe_file_range have been replaced with
 ->remap_file_range().  See Documentation/filesystems/vfs.rst for more
 information.
 
 ---
 
 **recommended**
 
 ->lookup() instances doing an equivalent of::
 
         if (IS_ERR(inode))
                 return ERR_CAST(inode);
         return d_splice_alias(inode, dentry);
 
 don't need to bother with the check - d_splice_alias() will do the
 right thing when given ERR_PTR(...) as inode.  Moreover, passing NULL
 inode to d_splice_alias() will also do the right thing (equivalent of
 d_add(dentry, NULL); return NULL;), so that kind of special cases
 also doesn't need a separate treatment.
 
 ---
 
 **strongly recommended**
 
 take the RCU-delayed parts of ->destroy_inode() into a new method -
 ->free_inode().  If ->destroy_inode() becomes empty - all the better,
 just get rid of it.  Synchronous work (e.g. the stuff that can't
 be done from an RCU callback, or any WARN_ON() where we want the
 stack trace) *might* be movable to ->evict_inode(); however,
 that goes only for the things that are not needed to balance something
 done by ->alloc_inode().  IOW, if it's cleaning up the stuff that
 might have accumulated over the life of in-core inode, ->evict_inode()
 might be a fit.
 
 Rules for inode destruction:
 
         * if ->destroy_inode() is non-NULL, it gets called
         * if ->free_inode() is non-NULL, it gets scheduled by call_rcu()
         * combination of NULL ->destroy_inode and NULL ->free_inode is
           treated as NULL/free_inode_nonrcu, to preserve the compatibility.
 
 Note that the callback (be it via ->free_inode() or explicit call_rcu()
 in ->destroy_inode()) is *NOT* ordered wrt superblock destruction;
 as the matter of fact, the superblock and all associated structures
 might be already gone.  The filesystem driver is guaranteed to be still
 there, but that's it.  Freeing memory in the callback is fine; doing
 more than that is possible, but requires a lot of care and is best
 avoided.
 
 ---
 
 **mandatory**
 
 DCACHE_RCUACCESS is gone; having an RCU delay on dentry freeing is the
 default.  DCACHE_NORCU opts out, and only d_alloc_pseudo() has any
 business doing so.
 
 ---
 
 **mandatory**
 
 d_alloc_pseudo() is internal-only; uses outside of alloc_file_pseudo() are
 very suspect (and won't work in modules).  Such uses are very likely to
 be misspelled d_alloc_anon().
 
 ---
 
 **mandatory**
 
 [should've been added in 2016] stale comment in finish_open() nonwithstanding,
 failure exits in ->atomic_open() instances should *NOT* fput() the file,
 no matter what.  Everything is handled by the caller.
 
 ---
 
 **mandatory**
 
 clone_private_mount() returns a longterm mount now, so the proper destructor of
 its result is kern_unmount() or kern_unmount_array().
 
 ---
 
 **mandatory**
 
 zero-length bvec segments are disallowed, they must be filtered out before
 passed on to an iterator.
 
 ---
 
 **mandatory**
 
 For bvec based itererators bio_iov_iter_get_pages() now doesn't copy bvecs but
 uses the one provided. Anyone issuing kiocb-I/O should ensure that the bvec and
 page references stay until I/O has completed, i.e. until ->ki_complete() has
 been called or returned with non -EIOCBQUEUED code.
 
 ---
 
 **mandatory**
 
 mnt_want_write_file() can now only be paired with mnt_drop_write_file(),
 whereas previously it could be paired with mnt_drop_write() as well.
 
 ---
 
 **mandatory**
 
 iov_iter_copy_from_user_atomic() is gone; use copy_page_from_iter_atomic().
 The difference is copy_page_from_iter_atomic() advances the iterator and
 you don't need iov_iter_advance() after it.  However, if you decide to use
 only a part of obtained data, you should do iov_iter_revert().
 
 ---
 
 **mandatory**
 
 Calling conventions for file_open_root() changed; now it takes struct path *
 instead of passing mount and dentry separately.  For callers that used to
 pass <mnt, mnt->mnt_root> pair (i.e. the root of given mount), a new helper
 is provided - file_open_root_mnt().  In-tree users adjusted.
 
 ---
 
 **mandatory**
 
 no_llseek is gone; don't set .llseek to that - just leave it NULL instead.
 Checks for "does that file have llseek(2), or should it fail with ESPIPE"
 should be done by looking at FMODE_LSEEK in file->f_mode.

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