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btrfs: Perform locking/unlocking in btrfs_remap_file_range()

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Move code to make it more readable, so as locking and unlocking is
done in the same function. The generic checks that are now performed in
the locked section are unaffected.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Goldwyn Rodrigues 2019-02-25 13:07:44 -06:00 committed by David Sterba
parent 290342f661
commit 7984ae52bb
1 changed files with 11 additions and 23 deletions
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34
fs/btrfs/ioctl.c
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@ -3950,16 +3950,10 @@ static int btrfs_remap_file_range_prep(struct file *file_in, loff_t pos_in,
return -EXDEV;
}
if (same_inode)
inode_lock(inode_in);
else
lock_two_nondirectories(inode_in, inode_out);
/* don't make the dst file partly checksummed */
if ((BTRFS_I(inode_in)->flags & BTRFS_INODE_NODATASUM) !=
(BTRFS_I(inode_out)->flags & BTRFS_INODE_NODATASUM)) {
ret = -EINVAL;
goto out_unlock;
return -EINVAL;
}
/*
@ -3993,26 +3987,14 @@ static int btrfs_remap_file_range_prep(struct file *file_in, loff_t pos_in,
ret = btrfs_wait_ordered_range(inode_in, ALIGN_DOWN(pos_in, bs),
wb_len);
if (ret < 0)
goto out_unlock;
return ret;
ret = btrfs_wait_ordered_range(inode_out, ALIGN_DOWN(pos_out, bs),
wb_len);
if (ret < 0)
goto out_unlock;
return ret;
ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out,
return generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out,
len, remap_flags);
if (ret < 0 || *len == 0)
goto out_unlock;
return 0;
out_unlock:
if (same_inode)
inode_unlock(inode_in);
else
unlock_two_nondirectories(inode_in, inode_out);
return ret;
}
loff_t btrfs_remap_file_range(struct file *src_file, loff_t off,
@ -4027,16 +4009,22 @@ loff_t btrfs_remap_file_range(struct file *src_file, loff_t off,
if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
return -EINVAL;
if (same_inode)
inode_lock(src_inode);
else
lock_two_nondirectories(src_inode, dst_inode);
ret = btrfs_remap_file_range_prep(src_file, off, dst_file, destoff,
&len, remap_flags);
if (ret < 0 || len == 0)
return ret;
goto out_unlock;
if (remap_flags & REMAP_FILE_DEDUP)
ret = btrfs_extent_same(src_inode, off, len, dst_inode, destoff);
else
ret = btrfs_clone_files(dst_file, src_file, off, len, destoff);
out_unlock:
if (same_inode)
inode_unlock(src_inode);
else