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author | David Woodhouse <dwmw2@infradead.org> | 2006-10-21 16:46:04 +0100 |
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committer | David Woodhouse <dwmw2@infradead.org> | 2006-10-21 16:46:04 +0100 |
commit | 513b046c96cc2fbce730a3474f6f7ff0c4fdd05c (patch) | |
tree | e8006368b6f643067486f92405a404757807d6da /fs/ext4/bitmap.c | |
parent | 82810b7b6cc7a74c68881a13b0eb66c7a6370fcc (diff) | |
parent | c7a3bd177f248d01ee18a01d22048c80e071c331 (diff) | |
download | linux-513b046c96cc2fbce730a3474f6f7ff0c4fdd05c.tar.gz linux-513b046c96cc2fbce730a3474f6f7ff0c4fdd05c.tar.bz2 linux-513b046c96cc2fbce730a3474f6f7ff0c4fdd05c.zip |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'fs/ext4/bitmap.c')
-rw-r--r-- | fs/ext4/bitmap.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/fs/ext4/bitmap.c b/fs/ext4/bitmap.c new file mode 100644 index 000000000000..11e93c169bcf --- /dev/null +++ b/fs/ext4/bitmap.c @@ -0,0 +1,32 @@ +/* + * linux/fs/ext4/bitmap.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + */ + +#include <linux/buffer_head.h> +#include <linux/jbd2.h> +#include <linux/ext4_fs.h> + +#ifdef EXT4FS_DEBUG + +static int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0}; + +unsigned long ext4_count_free (struct buffer_head * map, unsigned int numchars) +{ + unsigned int i; + unsigned long sum = 0; + + if (!map) + return (0); + for (i = 0; i < numchars; i++) + sum += nibblemap[map->b_data[i] & 0xf] + + nibblemap[(map->b_data[i] >> 4) & 0xf]; + return (sum); +} + +#endif /* EXT4FS_DEBUG */ + |