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btrfs: use end_pos variable where needed in btrfs_dirty_folio()

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We have a couple places doing the computation "pos + write_bytes" when we
already have it in the local variable "end_pos". Change then to use the
variable instead and make source code smaller. Also make the variable
const since it's not supposed to change.

This also has a very slight reduction in the module size.

Before:

   $ size fs/btrfs/btrfs.ko
      text	   data	    bss	    dec	    hex	filename
   1915990	 161647	  15592	2093229	 1ff0ad	fs/btrfs/btrfs.ko

After:

   $ size fs/btrfs/btrfs.ko
      text	   data	    bss	    dec	    hex	filename
   1915974	 161647	  15592	2093213	 1ff09d	fs/btrfs/btrfs.ko

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2025-10-07 11:14:37 +01:00 committed by David Sterba
parent 38e818718c
commit 892794c025
1 changed files with 3 additions and 4 deletions
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7
fs/btrfs/file.c
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@ -75,7 +75,7 @@ int btrfs_dirty_folio(struct btrfs_inode *inode, struct folio *folio, loff_t pos
u64 num_bytes;
u64 start_pos;
u64 end_of_last_block;
u64 end_pos = pos + write_bytes;
const u64 end_pos = pos + write_bytes;
loff_t isize = i_size_read(&inode->vfs_inode);
unsigned int extra_bits = 0;
@ -86,10 +86,9 @@ int btrfs_dirty_folio(struct btrfs_inode *inode, struct folio *folio, loff_t pos
extra_bits |= EXTENT_NORESERVE;
start_pos = round_down(pos, fs_info->sectorsize);
num_bytes = round_up(write_bytes + pos - start_pos,
fs_info->sectorsize);
num_bytes = round_up(end_pos - start_pos, fs_info->sectorsize);
ASSERT(num_bytes <= U32_MAX);
ASSERT(folio_pos(folio) <= pos && folio_end(folio) >= pos + write_bytes);
ASSERT(folio_pos(folio) <= pos && folio_end(folio) >= end_pos);
end_of_last_block = start_pos + num_bytes - 1;