diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-01-29 22:43:38 +1100 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-01-29 22:43:38 +1100 |
commit | 8cd226ca3f64f28c8123ebfaa6afe8dc8c18b174 (patch) | |
tree | 6a668a8e899dca090ded0d3b8d6badda8f97d1b0 /lib | |
parent | 6b11d8179d1c6e560edc02c40a53b65fde83bf3f (diff) | |
parent | 4019191be7316ed4a39e1c1c2b623baa7dc6c843 (diff) |
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (50 commits)
jbd2: sparse pointer use of zero as null
jbd2: Use round-jiffies() function for the "5 second" ext4/jbd2 wakeup
jbd2: Mark jbd2 slabs as SLAB_TEMPORARY
jbd2: add lockdep support
ext4: Use the ext4_ext_actual_len() helper function
ext4: fix uniniatilized extent splitting error
ext4: Check for return value from sb_set_blocksize
ext4: Add stripe= option to /proc/mounts
ext4: Enable the multiblock allocator by default
ext4: Add multi block allocator for ext4
ext4: Add new functions for searching extent tree
ext4: Add ext4_find_next_bit()
ext4: fix up EXT4FS_DEBUG builds
ext4: Fix ext4_show_options to show the correct mount options.
ext4: Add EXT4_IOC_MIGRATE ioctl
ext4: Add inode version support in ext4
vfs: Add 64 bit i_version support
ext4: Add the journal checksum feature
jbd2: jbd2 stats through procfs
ext4: Take read lock during overwrite case.
...
Diffstat (limited to 'lib')
-rw-r--r-- | lib/find_next_bit.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/lib/find_next_bit.c b/lib/find_next_bit.c index bda0d71a251..78ccd73a884 100644 --- a/lib/find_next_bit.c +++ b/lib/find_next_bit.c @@ -178,4 +178,47 @@ found_middle_swap: EXPORT_SYMBOL(generic_find_next_zero_le_bit); +unsigned long generic_find_next_le_bit(const unsigned long *addr, unsigned + long size, unsigned long offset) +{ + const unsigned long *p = addr + BITOP_WORD(offset); + unsigned long result = offset & ~(BITS_PER_LONG - 1); + unsigned long tmp; + + if (offset >= size) + return size; + size -= result; + offset &= (BITS_PER_LONG - 1UL); + if (offset) { + tmp = ext2_swabp(p++); + tmp &= (~0UL << offset); + if (size < BITS_PER_LONG) + goto found_first; + if (tmp) + goto found_middle; + size -= BITS_PER_LONG; + result += BITS_PER_LONG; + } + + while (size & ~(BITS_PER_LONG - 1)) { + tmp = *(p++); + if (tmp) + goto found_middle_swap; + result += BITS_PER_LONG; + size -= BITS_PER_LONG; + } + if (!size) + return result; + tmp = ext2_swabp(p); +found_first: + tmp &= (~0UL >> (BITS_PER_LONG - size)); + if (tmp == 0UL) /* Are any bits set? */ + return result + size; /* Nope. */ +found_middle: + return result + __ffs(tmp); + +found_middle_swap: + return result + __ffs(ext2_swab(tmp)); +} +EXPORT_SYMBOL(generic_find_next_le_bit); #endif /* __BIG_ENDIAN */ |