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factor out ntfs_attr_get_free_bits()

master
szaka 2007-10-27 20:10:34 +00:00
parent c06caa5353
commit 6be9b754b6
3 changed files with 33 additions and 53 deletions
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1
include/ntfs-3g/attrib.h
View File

@ -340,6 +340,7 @@ extern int ntfs_attr_exist(ntfs_inode *ni, const ATTR_TYPES type,
ntfschar *name, u32 name_len);
extern int ntfs_attr_remove(ntfs_inode *ni, const ATTR_TYPES type,
ntfschar *name, u32 name_len);
extern long ntfs_attr_get_free_bits(ntfs_attr *na);
#endif /* defined _NTFS_ATTRIB_H */

27
libntfs-3g/attrib.c
View File

@ -5042,3 +5042,30 @@ int ntfs_attr_remove(ntfs_inode *ni, const ATTR_TYPES type, ntfschar *name,
return ret;
}
long ntfs_attr_get_free_bits(ntfs_attr *na)
{
u8 *buf;
long nr_free = 0;
s64 br, total = 0;
buf = ntfs_malloc(na->ni->vol->cluster_size);
if (!buf)
return -errno;
while (1) {
int i, j;
br = ntfs_attr_pread(na, total, na->ni->vol->cluster_size, buf);
if (br <= 0)
break;
total += br;
for (i = 0; i < br; i++)
for (j = 0; j < 8; j++)
if (!((buf[i] >> j) & 1))
nr_free++;
}
free(buf);
if (!total || br < 0)
return -errno;
return nr_free;
}

58
src/ntfs-3g.c
View File

@ -169,59 +169,11 @@ static int ntfs_fuse_is_named_data_stream(const char *path)
static long ntfs_get_nr_free_mft_records(ntfs_volume *vol)
{
u8 *buf;
long nr_free = 0;
s64 br, total = 0;
ntfs_attr *na = vol->mftbmp_na;
long nr_free = ntfs_attr_get_free_bits(na);
buf = ntfs_malloc(vol->cluster_size);
if (!buf)
return -errno;
while (1) {
int i, j;
br = ntfs_attr_pread(vol->mftbmp_na, total,
vol->cluster_size, buf);
if (br <= 0)
break;
total += br;
for (i = 0; i < br; i++)
for (j = 0; j < 8; j++)
if (!((buf[i] >> j) & 1))
nr_free++;
}
free(buf);
if (!total || br < 0)
return -errno;
nr_free += (vol->mftbmp_na->allocated_size - vol->mftbmp_na->data_size) << 3;
return nr_free;
}
static long ntfs_get_nr_free_clusters(ntfs_volume *vol)
{
u8 *buf;
long nr_free = 0;
s64 br, total = 0;
buf = ntfs_malloc(vol->cluster_size);
if (!buf)
return -errno;
while (1) {
int i, j;
br = ntfs_attr_pread(vol->lcnbmp_na, total,
vol->cluster_size, buf);
if (br <= 0)
break;
total += br;
for (i = 0; i < br; i++)
for (j = 0; j < 8; j++)
if (!((buf[i] >> j) & 1))
nr_free++;
}
free(buf);
if (!total || br < 0)
return -errno;
if (nr_free >= 0)
nr_free += (na->allocated_size - na->data_size) << 3;
return nr_free;
}
@ -2283,7 +2235,7 @@ int main(int argc, char *argv[])
if (!ntfs_open(opts.device, opts.mnt_point, use_blkdev))
goto err_out;
ctx->vol->free_clusters = ntfs_get_nr_free_clusters(ctx->vol);
ctx->vol->free_clusters = ntfs_attr_get_free_bits(ctx->vol->lcnbmp_na);
if (ctx->vol->free_clusters < 0) {
ntfs_log_perror("Failed to read NTFS $Bitmap");
goto err_out;