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btrfs: replace kmap() with kmap_local_page() in inode.c 

The use of kmap() is being deprecated in favor of kmap_local_page() where
it is feasible. With kmap_local_page(), the mapping is per thread, CPU
local and not globally visible.

Therefore, use kmap_local_page() / kunmap_local() in inode.c wherever the
mappings are per thread and not globally visible.

Tested on QEMU + KVM 32 bits VM with 4GB of RAM and HIGHMEM64G enabled.

Suggested-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Fabio M. De Francesco 2022-05-31 16:53:33 +02:00 committed by David Sterba
parent 9ff7ddd3c7
commit 70826b6bd5
1 changed files with 3 additions and 3 deletions
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6
fs/btrfs/inode.c
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@ -10760,15 +10760,15 @@ ssize_t btrfs_do_encoded_write(struct kiocb *iocb, struct iov_iter *from,
ret = -ENOMEM;
goto out_pages;
}
kaddr = kmap(pages[i]);
kaddr = kmap_local_page(pages[i]);
if (copy_from_iter(kaddr, bytes, from) != bytes) {
kunmap(pages[i]);
kunmap_local(kaddr);
ret = -EFAULT;
goto out_pages;
}
if (bytes < PAGE_SIZE)
memset(kaddr + bytes, 0, PAGE_SIZE - bytes);
kunmap(pages[i]);
kunmap_local(kaddr);
}
for (;;) {