btrfs: introduce btrfs_write_check()

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btrfs_write_check() checks write parameters in one place before
beginning a write. This does away with inode_unlock() after every check.
In the later patches, it will help push inode_lock/unlock() in buffered
and direct write functions respectively.

generic_write_checks needs to be called before as it could truncate
iov_iter and its return used as count.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Goldwyn Rodrigues 2020-09-24 11:39:15 -05:00 • committed by David Sterba

parent c86537a42f

commit b8d8e1fd57

1 changed files with 77 additions and 74 deletions

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fs/btrfs/file.c

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