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linux-stable/fs/hpfs/alloc.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

582 lines
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// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/hpfs/alloc.c
*
* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
*
* HPFS bitmap operations
*/
#include "hpfs_fn.h"
static void hpfs_claim_alloc(struct super_block *s, secno sec)
{
struct hpfs_sb_info *sbi = hpfs_sb(s);
if (sbi->sb_n_free != (unsigned)-1) {
if (unlikely(!sbi->sb_n_free)) {
hpfs_error(s, "free count underflow, allocating sector %08x", sec);
sbi->sb_n_free = -1;
return;
}
sbi->sb_n_free--;
}
}
static void hpfs_claim_free(struct super_block *s, secno sec)
{
struct hpfs_sb_info *sbi = hpfs_sb(s);
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);
sbi->sb_n_free = -1;
return;
}
sbi->sb_n_free++;
}
}
static void hpfs_claim_dirband_alloc(struct super_block *s, secno sec)
{
struct hpfs_sb_info *sbi = hpfs_sb(s);
if (sbi->sb_n_free_dnodes != (unsigned)-1) {
if (unlikely(!sbi->sb_n_free_dnodes)) {
hpfs_error(s, "dirband free count underflow, allocating sector %08x", sec);
sbi->sb_n_free_dnodes = -1;
return;
}
sbi->sb_n_free_dnodes--;
}
}
static void hpfs_claim_dirband_free(struct super_block *s, secno sec)
{
struct hpfs_sb_info *sbi = hpfs_sb(s);
if (sbi->sb_n_free_dnodes != (unsigned)-1) {
if (unlikely(sbi->sb_n_free_dnodes >= sbi->sb_dirband_size / 4)) {
hpfs_error(s, "dirband free count overflow, freeing sector %08x", sec);
sbi->sb_n_free_dnodes = -1;
return;
}
sbi->sb_n_free_dnodes++;
}
}
/*
* Check if a sector is allocated in bitmap
* This is really slow. Turned on only if chk==2
*/
static int chk_if_allocated(struct super_block *s, secno sec, char *msg)
{
struct quad_buffer_head qbh;
__le32 *bmp;
if (!(bmp = hpfs_map_bitmap(s, sec >> 14, &qbh, "chk"))) goto fail;
if ((le32_to_cpu(bmp[(sec & 0x3fff) >> 5]) >> (sec & 0x1f)) & 1) {
hpfs_error(s, "sector '%s' - %08x not allocated in bitmap", msg, sec);
goto fail1;
}
hpfs_brelse4(&qbh);
if (sec >= hpfs_sb(s)->sb_dirband_start && sec < hpfs_sb(s)->sb_dirband_start + hpfs_sb(s)->sb_dirband_size) {
unsigned ssec = (sec - hpfs_sb(s)->sb_dirband_start) / 4;
if (!(bmp = hpfs_map_dnode_bitmap(s, &qbh))) goto fail;
if ((le32_to_cpu(bmp[ssec >> 5]) >> (ssec & 0x1f)) & 1) {
hpfs_error(s, "sector '%s' - %08x not allocated in directory bitmap", msg, sec);
goto fail1;
}
hpfs_brelse4(&qbh);
}
return 0;
fail1:
hpfs_brelse4(&qbh);
fail:
return 1;
}
/*
* Check if sector(s) have proper number and additionally check if they're
* allocated in bitmap.
*/
int hpfs_chk_sectors(struct super_block *s, secno start, int len, char *msg)
{
if (start + len < start || start < 0x12 ||
start + len > hpfs_sb(s)->sb_fs_size) {
hpfs_error(s, "sector(s) '%s' badly placed at %08x", msg, start);
return 1;
}
if (hpfs_sb(s)->sb_chk>=2) {
int i;
for (i = 0; i < len; i++)
if (chk_if_allocated(s, start + i, msg)) return 1;
}
return 0;
}
static secno alloc_in_bmp(struct super_block *s, secno near, unsigned n, unsigned forward)
{
struct quad_buffer_head qbh;
__le32 *bmp;
unsigned bs = near & ~0x3fff;
unsigned nr = (near & 0x3fff) & ~(n - 1);
/*unsigned mnr;*/
unsigned i, q;
int a, b;
secno ret = 0;
if (n != 1 && n != 4) {
hpfs_error(s, "Bad allocation size: %d", n);
return 0;
}
if (bs != ~0x3fff) {
if (!(bmp = hpfs_map_bitmap(s, near >> 14, &qbh, "aib"))) goto uls;
} else {
if (!(bmp = hpfs_map_dnode_bitmap(s, &qbh))) goto uls;
}
if (!tstbits(bmp, nr, n + forward)) {
ret = bs + nr;
goto rt;
}
q = nr + n; b = 0;
while ((a = tstbits(bmp, q, n + forward)) != 0) {
q += a;
if (n != 1) q = ((q-1)&~(n-1))+n;
if (!b) {
if (q>>5 != nr>>5) {
b = 1;
q = nr & 0x1f;
}
} else if (q > nr) break;
}
if (!a) {
ret = bs + q;
goto rt;
}
nr >>= 5;
/*for (i = nr + 1; i != nr; i++, i &= 0x1ff) */
i = nr;
do {
if (!le32_to_cpu(bmp[i])) goto cont;
if (n + forward >= 0x3f && le32_to_cpu(bmp[i]) != 0xffffffff) goto cont;
q = i<<5;
if (i > 0) {
unsigned k = le32_to_cpu(bmp[i-1]);
while (k & 0x80000000) {
q--; k <<= 1;
}
}
if (n != 1) q = ((q-1)&~(n-1))+n;
while ((a = tstbits(bmp, q, n + forward)) != 0) {
q += a;
if (n != 1) q = ((q-1)&~(n-1))+n;
if (q>>5 > i) break;
}
if (!a) {
ret = bs + q;
goto rt;
}
cont:
i++, i &= 0x1ff;
} while (i != nr);
rt:
if (ret) {
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);
ret = 0;
goto b;
}
bmp[(ret & 0x3fff) >> 5] &= cpu_to_le32(~(((1 << n) - 1) << (ret & 0x1f)));
hpfs_mark_4buffers_dirty(&qbh);
}
b:
hpfs_brelse4(&qbh);
uls:
return ret;
}
/*
* Allocation strategy: 1) search place near the sector specified
* 2) search bitmap where free sectors last found
* 3) search all bitmaps
* 4) search all bitmaps ignoring number of pre-allocated
* sectors
*/
secno hpfs_alloc_sector(struct super_block *s, secno near, unsigned n, int forward)
{
secno sec;
int i;
unsigned n_bmps;
struct hpfs_sb_info *sbi = hpfs_sb(s);
int f_p = 0;
int near_bmp;
if (forward < 0) {
forward = -forward;
f_p = 1;
}
n_bmps = (sbi->sb_fs_size + 0x4000 - 1) >> 14;
if (near && near < sbi->sb_fs_size) {
if ((sec = alloc_in_bmp(s, near, n, f_p ? forward : forward/4))) goto ret;
near_bmp = near >> 14;
} else near_bmp = n_bmps / 2;
/*
if (b != -1) {
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;
*/
if (!f_p) if (forward > sbi->sb_max_fwd_alloc) forward = sbi->sb_max_fwd_alloc;
less_fwd:
for (i = 0; i < n_bmps; i++) {
if (near_bmp+i < n_bmps && ((sec = alloc_in_bmp(s, (near_bmp+i) << 14, n, forward)))) {
sbi->sb_c_bitmap = near_bmp+i;
goto ret;
}
if (!forward) {
if (near_bmp-i-1 >= 0 && ((sec = alloc_in_bmp(s, (near_bmp-i-1) << 14, n, forward)))) {
sbi->sb_c_bitmap = near_bmp-i-1;
goto ret;
}
} else {
if (near_bmp+i >= n_bmps && ((sec = alloc_in_bmp(s, (near_bmp+i-n_bmps) << 14, n, forward)))) {
sbi->sb_c_bitmap = near_bmp+i-n_bmps;
goto ret;
}
}
if (i == 1 && sbi->sb_c_bitmap != -1 && ((sec = alloc_in_bmp(s, (sbi->sb_c_bitmap) << 14, n, forward)))) {
goto ret;
}
}
if (!f_p) {
if (forward) {
sbi->sb_max_fwd_alloc = forward * 3 / 4;
forward /= 2;
goto less_fwd;
}
}
sec = 0;
ret:
if (sec) {
i = 0;
do
hpfs_claim_alloc(s, sec + i);
while (unlikely(++i < n));
}
if (sec && f_p) {
for (i = 0; i < forward; i++) {
if (!hpfs_alloc_if_possible(s, sec + n + i)) {
hpfs_error(s, "Prealloc doesn't work! Wanted %d, allocated at %08x, can't allocate %d", forward, sec, i);
sec = 0;
break;
}
}
}
return sec;
}
static secno alloc_in_dirband(struct super_block *s, secno near)
{
unsigned nr = near;
secno sec;
struct hpfs_sb_info *sbi = hpfs_sb(s);
if (nr < sbi->sb_dirband_start)
nr = sbi->sb_dirband_start;
if (nr >= sbi->sb_dirband_start + sbi->sb_dirband_size)
nr = sbi->sb_dirband_start + sbi->sb_dirband_size - 4;
nr -= sbi->sb_dirband_start;
nr >>= 2;
sec = alloc_in_bmp(s, (~0x3fff) | nr, 1, 0);
if (!sec) return 0;
hpfs_claim_dirband_alloc(s, sec);
return ((sec & 0x3fff) << 2) + sbi->sb_dirband_start;
}
/* Alloc sector if it's free */
int hpfs_alloc_if_possible(struct super_block *s, secno sec)
{
struct quad_buffer_head qbh;
__le32 *bmp;
if (!(bmp = hpfs_map_bitmap(s, sec >> 14, &qbh, "aip"))) goto end;
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);
return 1;
}
hpfs_brelse4(&qbh);
end:
return 0;
}
/* 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;
}
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