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[PATCH] bitops: ntfs: remove generic_ffs() 

Now the only user who are using generic_ffs() is ntfs filesystem.  This patch
isolates generic_ffs() as ntfs_ffs() for ntfs.

Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
Cc: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Akinobu Mita 2006-03-26 01:39:53 -08:00 committed by Linus Torvalds
parent 55b0f8a68a
commit b9a2838cc2
3 changed files with 32 additions and 3 deletions
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4
fs/ntfs/logfile.c
View File

@ -515,10 +515,10 @@ BOOL ntfs_check_logfile(struct inode *log_vi, RESTART_PAGE_HEADER **rp)
log_page_size = PAGE_CACHE_SIZE;
log_page_mask = log_page_size - 1;
/*
* Use generic_ffs() instead of ffs() to enable the compiler to
* Use ntfs_ffs() instead of ffs() to enable the compiler to
* optimize log_page_size and log_page_bits into constants.
*/
log_page_bits = generic_ffs(log_page_size) - 1;
log_page_bits = ntfs_ffs(log_page_size) - 1;
size &= ~(s64)(log_page_size - 1);
/*
* Ensure the log file is big enough to store at least the two restart

2
fs/ntfs/mft.c
View File

@ -2670,7 +2670,7 @@ mft_rec_already_initialized:
ni->name_len = 4;
ni->itype.index.block_size = 4096;
ni->itype.index.block_size_bits = generic_ffs(4096) - 1;
ni->itype.index.block_size_bits = ntfs_ffs(4096) - 1;
ni->itype.index.collation_rule = COLLATION_FILE_NAME;
if (vol->cluster_size <= ni->itype.index.block_size) {
ni->itype.index.vcn_size = vol->cluster_size;

29
fs/ntfs/ntfs.h
View File

@ -132,4 +132,33 @@ extern int ntfs_ucstonls(const ntfs_volume *vol, const ntfschar *ins,
/* From fs/ntfs/upcase.c */
extern ntfschar *generate_default_upcase(void);
static inline int ntfs_ffs(int x)
{
int r = 1;
if (!x)
return 0;
if (!(x & 0xffff)) {
x >>= 16;
r += 16;
}
if (!(x & 0xff)) {
x >>= 8;
r += 8;
}
if (!(x & 0xf)) {
x >>= 4;
r += 4;
}
if (!(x & 3)) {
x >>= 2;
r += 2;
}
if (!(x & 1)) {
x >>= 1;
r += 1;
}
return r;
}
#endif /* _LINUX_NTFS_H */