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check for devices that would need more blocks than 32

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bits allow..
This commit is contained in:
Ben Gras 2009-02-05 16:30:20 +00:00
parent 6e86e6706d
commit eafd4730ea
1 changed files with 16 additions and 14 deletions
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30
commands/simple/mkfs.c
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@ -266,20 +266,12 @@ char *argv[];
if (blocks == 0) pexit("Can't open prototype file");
}
if (i == 0) {
int kb;
kb = blocks * (max(block_size,1024) / 1024);
/* The default for inodes is 2 blocks per kb, rounded up
* to fill an inode block. Above 20M, the average files are
* sure to be larger because it is hard to fill up 20M with
* tiny files, so reduce the default number of inodes. This
* default can always be overridden by using the '-i option.
*/
i = kb / 2;
if (kb >= 20000) i = kb / 3;
if (kb >= 40000) i = kb / 4;
if (kb >= 60000) i = kb / 5;
if (kb >= 80000) i = kb / 6;
if (kb >= 100000) i = kb / 7;
i = blocks / 2;
if (blocks >= 20000) i = blocks / 3;
if (blocks >= 40000) i = blocks / 4;
if (blocks >= 60000) i = blocks / 5;
if (blocks >= 80000) i = blocks / 6;
if (blocks >= 100000) i = blocks / 7;
/* round up to fill inode block */
i += inodes_per_block - 1;
@ -392,6 +384,8 @@ char *device;
struct partition entry;
block_t d;
struct stat st;
unsigned int rem;
u64_t resize;
if ((fd = open(device, O_RDONLY)) == -1) {
if (errno != ENOENT)
@ -410,6 +404,14 @@ char *device;
}
close(fd);
d = div64u(entry.size, block_size);
rem = rem64u(entry.size, block_size);
resize = add64u(mul64u(d, block_size), rem);
if(cmp64(resize, entry.size) != 0) {
d = ULONG_MAX;
fprintf(stderr, "mkfs: truncating FS at %lu blocks\n", d);
}
return d;
}