linux.git/fs/btrfs/export.c, branch v6.3

btrfs: move super_block specific helpers into super.h

2022-12-05T17:00:47+00:00

This will make syncing fs.h to user space a little easier if we can pull
the super block specific helpers out of fs.h and put them in super.h.

Reviewed-by: Johannes Thumshirn 
Signed-off-by: Josef Bacik 
Reviewed-by: David Sterba 
Signed-off-by: David Sterba

btrfs: move accessor helpers into accessors.h

2022-12-05T17:00:42+00:00

This is a large patch, but because they're all macros it's impossible to
split up.  Simply copy all of the item accessors in ctree.h and paste
them in accessors.h, and then update any files to include the header so
everything compiles.

Reviewed-by: Anand Jain 
Signed-off-by: Josef Bacik 
Reviewed-by: David Sterba 
[ reformat comments, style fixups ]
Signed-off-by: David Sterba

btrfs: simplify generation check in btrfs_get_dentry

2022-12-05T17:00:41+00:00

Callers that pass non-zero generation always want to perform the
generation check, we can simply encode that in one parameter and drop
check_generation. Add function documentation.

Reviewed-by: Josef Bacik 
Signed-off-by: David Sterba

btrfs: fix type of parameter generation in btrfs_get_dentry

2022-10-24T13:28:58+00:00

The type of parameter generation has been u32 since the beginning,
however all callers pass a u64 generation, so unify the types to prevent
potential loss.

CC: stable@vger.kernel.org # 4.9+
Reviewed-by: Josef Bacik 
Signed-off-by: David Sterba

btrfs: locking: rip out path->leave_spinning

2020-12-08T14:54:02+00:00

We no longer distinguish between blocking and spinning, so rip out all
this code.

Signed-off-by: Josef Bacik 
Reviewed-by: David Sterba 
Signed-off-by: David Sterba

btrfs: simplify iget helpers

2020-05-25T09:25:37+00:00

The inode lookup starting at btrfs_iget takes the full location key,
while only the objectid is used to match the inode, because the lookup
happens inside the given root thus the inode number is unique.
The entire location key is properly set up in btrfs_init_locked_inode.

Simplify the helpers and pass only inode number, renaming it to 'ino'
instead of 'objectid'. This allows to remove temporary variables key,
saving some stack space.

Signed-off-by: David Sterba

btrfs: simplify root lookup by id

2020-05-25T09:25:36+00:00

The main function to lookup a root by its id btrfs_get_fs_root takes the
whole key, while only using the objectid. The value of offset is preset
to (u64)-1 but not actually used until btrfs_find_root that does the
actual search.

Switch btrfs_get_fs_root to use only objectid and remove all local
variables that existed just for the lookup. The actual key for search is
set up in btrfs_get_fs_root, reusing another key variable.

Signed-off-by: David Sterba

btrfs: kill the subvol_srcu

2020-03-23T16:02:00+00:00

Now that we have proper root ref counting everywhere we can kill the
subvol_srcu.

* removal of fs_info::subvol_srcu reduces size of fs_info by 1176 bytes

* the refcount_t used for the references checks for accidental 0->1
  in cases where the root lifetime would not be properly protected

* there's a leak detector for roots to catch unfreed roots at umount
  time

* SRCU served us well over the years but is was not a proper
  synchronization mechanism for some cases

Signed-off-by: Josef Bacik 
Reviewed-by: David Sterba 
[ update changelog ]
Signed-off-by: David Sterba

btrfs: export helpers for subvolume name/id resolution

2020-03-23T16:01:42+00:00

The functions will be used outside of export.c and super.c to allow
resolving subvolume name from a given id, eg. for subvolume deletion by
id ioctl.

Signed-off-by: Marcos Paulo de Souza 
Reviewed-by: David Sterba 
[ split from the next patch ]
Signed-off-by: David Sterba

btrfs: rename btrfs_put_fs_root and btrfs_grab_fs_root

2020-03-23T16:01:33+00:00

We are now using these for all roots, rename them to btrfs_put_root()
and btrfs_grab_root();

Reviewed-by: Nikolay Borisov 
Signed-off-by: Josef Bacik 
Reviewed-by: David Sterba 
Signed-off-by: David Sterba