a209c3ae12
This patch fixes most of current reasons to generate compiler warnings.
The changes consist of:
- adding missing casts
- hiding or unhiding function declarations
- including headers where missing
- add __UNCONST when assigning a const char * to a char *
- adding missing return statements
- changing some types from unsigned to signed, as the code seems to want
signed ints
- converting old-style function definitions to current style (i.e.,
void func(param1, param2) short param1, param2; {...} to
void func (short param1, short param2) {...})
- making the compiler silent about signed vs unsigned comparisons. We
have too many of those in the new libc to fix.
A number of bugs in the test set were fixed. These bugs were never
triggered with our old libc. Consequently, these tests are now forced to
link with the new libc or they will generate errors (in particular tests 43
and 55).
Most changes in NetBSD libc are limited to moving aroudn "#ifndef __minix"
or stuff related to Minix-specific things (code in sys-minix or gen/minix).
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
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#define _SYSTEM
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#include <minix/libminixfs.h>
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#include <minix/dmap.h>
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#include <minix/u64.h>
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#include <minix/sysutil.h>
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#include <sys/param.h>
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#include <errno.h>
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u32_t fs_bufs_heuristic(int minbufs, u32_t btotal, u32_t bfree,
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int blocksize, dev_t majordev)
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{
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struct vm_stats_info vsi;
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int bufs;
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u32_t kbytes_used_fs, kbytes_total_fs, kbcache, kb_fsmax;
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u32_t kbytes_remain_mem, bused;
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bused = btotal-bfree;
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/* but we simply need minbufs no matter what, and we don't
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* want more than that if we're a memory device
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*/
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if(majordev == MEMORY_MAJOR) {
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return minbufs;
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}
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/* set a reasonable cache size; cache at most a certain
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* portion of the used FS, and at most a certain %age of remaining
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* memory
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*/
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if((vm_info_stats(&vsi) != OK)) {
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bufs = 1024;
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printf("fslib: heuristic info fail: default to %d bufs\n", bufs);
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return bufs;
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}
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kbytes_remain_mem = div64u(mul64u(vsi.vsi_free, vsi.vsi_pagesize), 1024);
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/* check fs usage. */
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kbytes_used_fs = div64u(mul64u(bused, blocksize), 1024);
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kbytes_total_fs = div64u(mul64u(btotal, blocksize), 1024);
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/* heuristic for a desired cache size based on FS usage;
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* but never bigger than half of the total filesystem
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*/
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kb_fsmax = sqrt_approx(kbytes_used_fs)*40;
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kb_fsmax = MIN(kb_fsmax, kbytes_total_fs/2);
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/* heuristic for a maximum usage - 10% of remaining memory */
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kbcache = MIN(kbytes_remain_mem/10, kb_fsmax);
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bufs = kbcache * 1024 / blocksize;
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/* but we simply need MINBUFS no matter what */
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if(bufs < minbufs)
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bufs = minbufs;
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return bufs;
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}
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