kernel/linux.git/fs/btrfs/export.c, branch linux-6.0.y

btrfs: fix type of parameter generation in btrfs_get_dentry

2022-11-10T17:17:31+00:00

commit 2398091f9c2c8e0040f4f9928666787a3e8108a7 upstream. 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 Signed-off-by: Greg Kroah-Hartman

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

btrfs: push btrfs_grab_fs_root into btrfs_get_fs_root

2020-03-23T16:01:32+00:00

Now that all callers of btrfs_get_fs_root are subsequently calling btrfs_grab_fs_root and handling dropping the ref when they are done appropriately, go ahead and push btrfs_grab_fs_root up into btrfs_get_fs_root. Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: hold a root ref in btrfs_get_dentry

2020-03-23T16:01:27+00:00

Looking up the inode we need to search the root, make sure we hold a reference on that root while we're doing the lookup. Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: open code btrfs_read_fs_root_no_name

2020-03-23T16:01:26+00:00

All this does is call btrfs_get_fs_root() with check_ref == true. Just use btrfs_get_fs_root() so we don't have a bunch of different helpers that do the same thing. Reviewed-by: Nikolay Borisov Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba