// SPDX-License-Identifier: GPL-2.0
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/*
|
* linux/fs/hpfs/alloc.c
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*
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* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
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*
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* HPFS bitmap operations
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*/
|
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#include "hpfs_fn.h"
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static void hpfs_claim_alloc(struct super_block *s, secno sec)
|
{
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struct hpfs_sb_info *sbi = hpfs_sb(s);
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if (sbi->sb_n_free != (unsigned)-1) {
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if (unlikely(!sbi->sb_n_free)) {
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hpfs_error(s, "free count underflow, allocating sector %08x", sec);
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sbi->sb_n_free = -1;
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return;
|
}
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sbi->sb_n_free--;
|
}
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}
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static void hpfs_claim_free(struct super_block *s, secno sec)
|
{
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struct hpfs_sb_info *sbi = hpfs_sb(s);
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if (sbi->sb_n_free != (unsigned)-1) {
|
if (unlikely(sbi->sb_n_free >= sbi->sb_fs_size)) {
|
hpfs_error(s, "free count overflow, freeing sector %08x", sec);
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sbi->sb_n_free = -1;
|
return;
|
}
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sbi->sb_n_free++;
|
}
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}
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static void hpfs_claim_dirband_alloc(struct super_block *s, secno sec)
|
{
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struct hpfs_sb_info *sbi = hpfs_sb(s);
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if (sbi->sb_n_free_dnodes != (unsigned)-1) {
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if (unlikely(!sbi->sb_n_free_dnodes)) {
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hpfs_error(s, "dirband free count underflow, allocating sector %08x", sec);
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sbi->sb_n_free_dnodes = -1;
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return;
|
}
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sbi->sb_n_free_dnodes--;
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}
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}
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static void hpfs_claim_dirband_free(struct super_block *s, secno sec)
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{
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struct hpfs_sb_info *sbi = hpfs_sb(s);
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if (sbi->sb_n_free_dnodes != (unsigned)-1) {
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if (unlikely(sbi->sb_n_free_dnodes >= sbi->sb_dirband_size / 4)) {
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hpfs_error(s, "dirband free count overflow, freeing sector %08x", sec);
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sbi->sb_n_free_dnodes = -1;
|
return;
|
}
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sbi->sb_n_free_dnodes++;
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}
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}
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/*
|
* Check if a sector is allocated in bitmap
|
* This is really slow. Turned on only if chk==2
|
*/
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static int chk_if_allocated(struct super_block *s, secno sec, char *msg)
|
{
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struct quad_buffer_head qbh;
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__le32 *bmp;
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if (!(bmp = hpfs_map_bitmap(s, sec >> 14, &qbh, "chk"))) goto fail;
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if ((le32_to_cpu(bmp[(sec & 0x3fff) >> 5]) >> (sec & 0x1f)) & 1) {
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hpfs_error(s, "sector '%s' - %08x not allocated in bitmap", msg, sec);
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goto fail1;
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}
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hpfs_brelse4(&qbh);
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if (sec >= hpfs_sb(s)->sb_dirband_start && sec < hpfs_sb(s)->sb_dirband_start + hpfs_sb(s)->sb_dirband_size) {
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unsigned ssec = (sec - hpfs_sb(s)->sb_dirband_start) / 4;
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if (!(bmp = hpfs_map_dnode_bitmap(s, &qbh))) goto fail;
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if ((le32_to_cpu(bmp[ssec >> 5]) >> (ssec & 0x1f)) & 1) {
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hpfs_error(s, "sector '%s' - %08x not allocated in directory bitmap", msg, sec);
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goto fail1;
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}
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hpfs_brelse4(&qbh);
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}
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return 0;
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fail1:
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hpfs_brelse4(&qbh);
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fail:
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return 1;
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}
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/*
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* Check if sector(s) have proper number and additionally check if they're
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* allocated in bitmap.
|
*/
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int hpfs_chk_sectors(struct super_block *s, secno start, int len, char *msg)
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{
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if (start + len < start || start < 0x12 ||
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start + len > hpfs_sb(s)->sb_fs_size) {
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hpfs_error(s, "sector(s) '%s' badly placed at %08x", msg, start);
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return 1;
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}
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if (hpfs_sb(s)->sb_chk>=2) {
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int i;
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for (i = 0; i < len; i++)
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if (chk_if_allocated(s, start + i, msg)) return 1;
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}
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return 0;
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}
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static secno alloc_in_bmp(struct super_block *s, secno near, unsigned n, unsigned forward)
|
{
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struct quad_buffer_head qbh;
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__le32 *bmp;
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unsigned bs = near & ~0x3fff;
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unsigned nr = (near & 0x3fff) & ~(n - 1);
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/*unsigned mnr;*/
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unsigned i, q;
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int a, b;
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secno ret = 0;
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if (n != 1 && n != 4) {
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hpfs_error(s, "Bad allocation size: %d", n);
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return 0;
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}
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if (bs != ~0x3fff) {
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if (!(bmp = hpfs_map_bitmap(s, near >> 14, &qbh, "aib"))) goto uls;
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} else {
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if (!(bmp = hpfs_map_dnode_bitmap(s, &qbh))) goto uls;
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}
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if (!tstbits(bmp, nr, n + forward)) {
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ret = bs + nr;
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goto rt;
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}
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q = nr + n; b = 0;
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while ((a = tstbits(bmp, q, n + forward)) != 0) {
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q += a;
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if (n != 1) q = ((q-1)&~(n-1))+n;
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if (!b) {
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if (q>>5 != nr>>5) {
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b = 1;
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q = nr & 0x1f;
|
}
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} else if (q > nr) break;
|
}
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if (!a) {
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ret = bs + q;
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goto rt;
|
}
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nr >>= 5;
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/*for (i = nr + 1; i != nr; i++, i &= 0x1ff) */
|
i = nr;
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do {
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if (!le32_to_cpu(bmp[i])) goto cont;
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if (n + forward >= 0x3f && le32_to_cpu(bmp[i]) != 0xffffffff) goto cont;
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q = i<<5;
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if (i > 0) {
|
unsigned k = le32_to_cpu(bmp[i-1]);
|
while (k & 0x80000000) {
|
q--; k <<= 1;
|
}
|
}
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if (n != 1) q = ((q-1)&~(n-1))+n;
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while ((a = tstbits(bmp, q, n + forward)) != 0) {
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q += a;
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if (n != 1) q = ((q-1)&~(n-1))+n;
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if (q>>5 > i) break;
|
}
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if (!a) {
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ret = bs + q;
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goto rt;
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}
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cont:
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i++, i &= 0x1ff;
|
} while (i != nr);
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rt:
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if (ret) {
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if (hpfs_sb(s)->sb_chk && ((ret >> 14) != (bs >> 14) || (le32_to_cpu(bmp[(ret & 0x3fff) >> 5]) | ~(((1 << n) - 1) << (ret & 0x1f))) != 0xffffffff)) {
|
hpfs_error(s, "Allocation doesn't work! Wanted %d, allocated at %08x", n, ret);
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ret = 0;
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goto b;
|
}
|
bmp[(ret & 0x3fff) >> 5] &= cpu_to_le32(~(((1 << n) - 1) << (ret & 0x1f)));
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hpfs_mark_4buffers_dirty(&qbh);
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}
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b:
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hpfs_brelse4(&qbh);
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uls:
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return ret;
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}
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/*
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* Allocation strategy: 1) search place near the sector specified
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* 2) search bitmap where free sectors last found
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* 3) search all bitmaps
|
* 4) search all bitmaps ignoring number of pre-allocated
|
* sectors
|
*/
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secno hpfs_alloc_sector(struct super_block *s, secno near, unsigned n, int forward)
|
{
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secno sec;
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int i;
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unsigned n_bmps;
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struct hpfs_sb_info *sbi = hpfs_sb(s);
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int f_p = 0;
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int near_bmp;
|
if (forward < 0) {
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forward = -forward;
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f_p = 1;
|
}
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n_bmps = (sbi->sb_fs_size + 0x4000 - 1) >> 14;
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if (near && near < sbi->sb_fs_size) {
|
if ((sec = alloc_in_bmp(s, near, n, f_p ? forward : forward/4))) goto ret;
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near_bmp = near >> 14;
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} else near_bmp = n_bmps / 2;
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/*
|
if (b != -1) {
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if ((sec = alloc_in_bmp(s, b<<14, n, f_p ? forward : forward/2))) {
|
b &= 0x0fffffff;
|
goto ret;
|
}
|
if (b > 0x10000000) if ((sec = alloc_in_bmp(s, (b&0xfffffff)<<14, n, f_p ? forward : 0))) goto ret;
|
*/
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if (!f_p) if (forward > sbi->sb_max_fwd_alloc) forward = sbi->sb_max_fwd_alloc;
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less_fwd:
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for (i = 0; i < n_bmps; i++) {
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if (near_bmp+i < n_bmps && ((sec = alloc_in_bmp(s, (near_bmp+i) << 14, n, forward)))) {
|
sbi->sb_c_bitmap = near_bmp+i;
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goto ret;
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}
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if (!forward) {
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if (near_bmp-i-1 >= 0 && ((sec = alloc_in_bmp(s, (near_bmp-i-1) << 14, n, forward)))) {
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sbi->sb_c_bitmap = near_bmp-i-1;
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goto ret;
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}
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} else {
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if (near_bmp+i >= n_bmps && ((sec = alloc_in_bmp(s, (near_bmp+i-n_bmps) << 14, n, forward)))) {
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sbi->sb_c_bitmap = near_bmp+i-n_bmps;
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goto ret;
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}
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}
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if (i == 1 && sbi->sb_c_bitmap != -1 && ((sec = alloc_in_bmp(s, (sbi->sb_c_bitmap) << 14, n, forward)))) {
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goto ret;
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}
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}
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if (!f_p) {
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if (forward) {
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sbi->sb_max_fwd_alloc = forward * 3 / 4;
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forward /= 2;
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goto less_fwd;
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}
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}
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sec = 0;
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ret:
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if (sec) {
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i = 0;
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do
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hpfs_claim_alloc(s, sec + i);
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while (unlikely(++i < n));
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}
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if (sec && f_p) {
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for (i = 0; i < forward; i++) {
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if (!hpfs_alloc_if_possible(s, sec + n + i)) {
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hpfs_error(s, "Prealloc doesn't work! Wanted %d, allocated at %08x, can't allocate %d", forward, sec, i);
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sec = 0;
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break;
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}
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}
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}
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return sec;
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}
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static secno alloc_in_dirband(struct super_block *s, secno near)
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{
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unsigned nr = near;
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secno sec;
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struct hpfs_sb_info *sbi = hpfs_sb(s);
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if (nr < sbi->sb_dirband_start)
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nr = sbi->sb_dirband_start;
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if (nr >= sbi->sb_dirband_start + sbi->sb_dirband_size)
|
nr = sbi->sb_dirband_start + sbi->sb_dirband_size - 4;
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nr -= sbi->sb_dirband_start;
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nr >>= 2;
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sec = alloc_in_bmp(s, (~0x3fff) | nr, 1, 0);
|
if (!sec) return 0;
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hpfs_claim_dirband_alloc(s, sec);
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return ((sec & 0x3fff) << 2) + sbi->sb_dirband_start;
|
}
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/* Alloc sector if it's free */
|
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int hpfs_alloc_if_possible(struct super_block *s, secno sec)
|
{
|
struct quad_buffer_head qbh;
|
__le32 *bmp;
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if (!(bmp = hpfs_map_bitmap(s, sec >> 14, &qbh, "aip"))) goto end;
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if (le32_to_cpu(bmp[(sec & 0x3fff) >> 5]) & (1 << (sec & 0x1f))) {
|
bmp[(sec & 0x3fff) >> 5] &= cpu_to_le32(~(1 << (sec & 0x1f)));
|
hpfs_mark_4buffers_dirty(&qbh);
|
hpfs_brelse4(&qbh);
|
hpfs_claim_alloc(s, sec);
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return 1;
|
}
|
hpfs_brelse4(&qbh);
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end:
|
return 0;
|
}
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/* Free sectors in bitmaps */
|
|
void hpfs_free_sectors(struct super_block *s, secno sec, unsigned n)
|
{
|
struct quad_buffer_head qbh;
|
__le32 *bmp;
|
struct hpfs_sb_info *sbi = hpfs_sb(s);
|
/*pr_info("2 - ");*/
|
if (!n) return;
|
if (sec < 0x12) {
|
hpfs_error(s, "Trying to free reserved sector %08x", sec);
|
return;
|
}
|
sbi->sb_max_fwd_alloc += n > 0xffff ? 0xffff : n;
|
if (sbi->sb_max_fwd_alloc > 0xffffff) sbi->sb_max_fwd_alloc = 0xffffff;
|
new_map:
|
if (!(bmp = hpfs_map_bitmap(s, sec >> 14, &qbh, "free"))) {
|
return;
|
}
|
new_tst:
|
if ((le32_to_cpu(bmp[(sec & 0x3fff) >> 5]) >> (sec & 0x1f) & 1)) {
|
hpfs_error(s, "sector %08x not allocated", sec);
|
hpfs_brelse4(&qbh);
|
return;
|
}
|
bmp[(sec & 0x3fff) >> 5] |= cpu_to_le32(1 << (sec & 0x1f));
|
hpfs_claim_free(s, sec);
|
if (!--n) {
|
hpfs_mark_4buffers_dirty(&qbh);
|
hpfs_brelse4(&qbh);
|
return;
|
}
|
if (!(++sec & 0x3fff)) {
|
hpfs_mark_4buffers_dirty(&qbh);
|
hpfs_brelse4(&qbh);
|
goto new_map;
|
}
|
goto new_tst;
|
}
|
|
/*
|
* Check if there are at least n free dnodes on the filesystem.
|
* Called before adding to dnode. If we run out of space while
|
* splitting dnodes, it would corrupt dnode tree.
|
*/
|
|
int hpfs_check_free_dnodes(struct super_block *s, int n)
|
{
|
int n_bmps = (hpfs_sb(s)->sb_fs_size + 0x4000 - 1) >> 14;
|
int b = hpfs_sb(s)->sb_c_bitmap & 0x0fffffff;
|
int i, j;
|
__le32 *bmp;
|
struct quad_buffer_head qbh;
|
if ((bmp = hpfs_map_dnode_bitmap(s, &qbh))) {
|
for (j = 0; j < 512; j++) {
|
unsigned k;
|
if (!le32_to_cpu(bmp[j])) continue;
|
for (k = le32_to_cpu(bmp[j]); k; k >>= 1) if (k & 1) if (!--n) {
|
hpfs_brelse4(&qbh);
|
return 0;
|
}
|
}
|
}
|
hpfs_brelse4(&qbh);
|
i = 0;
|
if (hpfs_sb(s)->sb_c_bitmap != -1) {
|
bmp = hpfs_map_bitmap(s, b, &qbh, "chkdn1");
|
goto chk_bmp;
|
}
|
chk_next:
|
if (i == b) i++;
|
if (i >= n_bmps) return 1;
|
bmp = hpfs_map_bitmap(s, i, &qbh, "chkdn2");
|
chk_bmp:
|
if (bmp) {
|
for (j = 0; j < 512; j++) {
|
u32 k;
|
if (!le32_to_cpu(bmp[j])) continue;
|
for (k = 0xf; k; k <<= 4)
|
if ((le32_to_cpu(bmp[j]) & k) == k) {
|
if (!--n) {
|
hpfs_brelse4(&qbh);
|
return 0;
|
}
|
}
|
}
|
hpfs_brelse4(&qbh);
|
}
|
i++;
|
goto chk_next;
|
}
|
|
void hpfs_free_dnode(struct super_block *s, dnode_secno dno)
|
{
|
if (hpfs_sb(s)->sb_chk) if (dno & 3) {
|
hpfs_error(s, "hpfs_free_dnode: dnode %08x not aligned", dno);
|
return;
|
}
|
if (dno < hpfs_sb(s)->sb_dirband_start ||
|
dno >= hpfs_sb(s)->sb_dirband_start + hpfs_sb(s)->sb_dirband_size) {
|
hpfs_free_sectors(s, dno, 4);
|
} else {
|
struct quad_buffer_head qbh;
|
__le32 *bmp;
|
unsigned ssec = (dno - hpfs_sb(s)->sb_dirband_start) / 4;
|
if (!(bmp = hpfs_map_dnode_bitmap(s, &qbh))) {
|
return;
|
}
|
bmp[ssec >> 5] |= cpu_to_le32(1 << (ssec & 0x1f));
|
hpfs_mark_4buffers_dirty(&qbh);
|
hpfs_brelse4(&qbh);
|
hpfs_claim_dirband_free(s, dno);
|
}
|
}
|
|
struct dnode *hpfs_alloc_dnode(struct super_block *s, secno near,
|
dnode_secno *dno, struct quad_buffer_head *qbh)
|
{
|
struct dnode *d;
|
if (hpfs_get_free_dnodes(s) > FREE_DNODES_ADD) {
|
if (!(*dno = alloc_in_dirband(s, near)))
|
if (!(*dno = hpfs_alloc_sector(s, near, 4, 0))) return NULL;
|
} else {
|
if (!(*dno = hpfs_alloc_sector(s, near, 4, 0)))
|
if (!(*dno = alloc_in_dirband(s, near))) return NULL;
|
}
|
if (!(d = hpfs_get_4sectors(s, *dno, qbh))) {
|
hpfs_free_dnode(s, *dno);
|
return NULL;
|
}
|
memset(d, 0, 2048);
|
d->magic = cpu_to_le32(DNODE_MAGIC);
|
d->first_free = cpu_to_le32(52);
|
d->dirent[0] = 32;
|
d->dirent[2] = 8;
|
d->dirent[30] = 1;
|
d->dirent[31] = 255;
|
d->self = cpu_to_le32(*dno);
|
return d;
|
}
|
|
struct fnode *hpfs_alloc_fnode(struct super_block *s, secno near, fnode_secno *fno,
|
struct buffer_head **bh)
|
{
|
struct fnode *f;
|
if (!(*fno = hpfs_alloc_sector(s, near, 1, FNODE_ALLOC_FWD))) return NULL;
|
if (!(f = hpfs_get_sector(s, *fno, bh))) {
|
hpfs_free_sectors(s, *fno, 1);
|
return NULL;
|
}
|
memset(f, 0, 512);
|
f->magic = cpu_to_le32(FNODE_MAGIC);
|
f->ea_offs = cpu_to_le16(0xc4);
|
f->btree.n_free_nodes = 8;
|
f->btree.first_free = cpu_to_le16(8);
|
return f;
|
}
|
|
struct anode *hpfs_alloc_anode(struct super_block *s, secno near, anode_secno *ano,
|
struct buffer_head **bh)
|
{
|
struct anode *a;
|
if (!(*ano = hpfs_alloc_sector(s, near, 1, ANODE_ALLOC_FWD))) return NULL;
|
if (!(a = hpfs_get_sector(s, *ano, bh))) {
|
hpfs_free_sectors(s, *ano, 1);
|
return NULL;
|
}
|
memset(a, 0, 512);
|
a->magic = cpu_to_le32(ANODE_MAGIC);
|
a->self = cpu_to_le32(*ano);
|
a->btree.n_free_nodes = 40;
|
a->btree.n_used_nodes = 0;
|
a->btree.first_free = cpu_to_le16(8);
|
return a;
|
}
|
|
static unsigned find_run(__le32 *bmp, unsigned *idx)
|
{
|
unsigned len;
|
while (tstbits(bmp, *idx, 1)) {
|
(*idx)++;
|
if (unlikely(*idx >= 0x4000))
|
return 0;
|
}
|
len = 1;
|
while (!tstbits(bmp, *idx + len, 1))
|
len++;
|
return len;
|
}
|
|
static int do_trim(struct super_block *s, secno start, unsigned len, secno limit_start, secno limit_end, unsigned minlen, unsigned *result)
|
{
|
int err;
|
secno end;
|
if (fatal_signal_pending(current))
|
return -EINTR;
|
end = start + len;
|
if (start < limit_start)
|
start = limit_start;
|
if (end > limit_end)
|
end = limit_end;
|
if (start >= end)
|
return 0;
|
if (end - start < minlen)
|
return 0;
|
err = sb_issue_discard(s, start, end - start, GFP_NOFS, 0);
|
if (err)
|
return err;
|
*result += end - start;
|
return 0;
|
}
|
|
int hpfs_trim_fs(struct super_block *s, u64 start, u64 end, u64 minlen, unsigned *result)
|
{
|
int err = 0;
|
struct hpfs_sb_info *sbi = hpfs_sb(s);
|
unsigned idx, len, start_bmp, end_bmp;
|
__le32 *bmp;
|
struct quad_buffer_head qbh;
|
|
*result = 0;
|
if (!end || end > sbi->sb_fs_size)
|
end = sbi->sb_fs_size;
|
if (start >= sbi->sb_fs_size)
|
return 0;
|
if (minlen > 0x4000)
|
return 0;
|
if (start < sbi->sb_dirband_start + sbi->sb_dirband_size && end > sbi->sb_dirband_start) {
|
hpfs_lock(s);
|
if (sb_rdonly(s)) {
|
err = -EROFS;
|
goto unlock_1;
|
}
|
if (!(bmp = hpfs_map_dnode_bitmap(s, &qbh))) {
|
err = -EIO;
|
goto unlock_1;
|
}
|
idx = 0;
|
while ((len = find_run(bmp, &idx)) && !err) {
|
err = do_trim(s, sbi->sb_dirband_start + idx * 4, len * 4, start, end, minlen, result);
|
idx += len;
|
}
|
hpfs_brelse4(&qbh);
|
unlock_1:
|
hpfs_unlock(s);
|
}
|
start_bmp = start >> 14;
|
end_bmp = (end + 0x3fff) >> 14;
|
while (start_bmp < end_bmp && !err) {
|
hpfs_lock(s);
|
if (sb_rdonly(s)) {
|
err = -EROFS;
|
goto unlock_2;
|
}
|
if (!(bmp = hpfs_map_bitmap(s, start_bmp, &qbh, "trim"))) {
|
err = -EIO;
|
goto unlock_2;
|
}
|
idx = 0;
|
while ((len = find_run(bmp, &idx)) && !err) {
|
err = do_trim(s, (start_bmp << 14) + idx, len, start, end, minlen, result);
|
idx += len;
|
}
|
hpfs_brelse4(&qbh);
|
unlock_2:
|
hpfs_unlock(s);
|
start_bmp++;
|
}
|
return err;
|
}
|
