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linux/fs/ocfs2/quota_global.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

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// SPDX-License-Identifier: GPL-2.0
/*
* Implementation of operations over global quota file
*/
#include <linux/spinlock.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/quota.h>
#include <linux/quotaops.h>
#include <linux/dqblk_qtree.h>
#include <linux/jiffies.h>
#include <linux/writeback.h>
#include <linux/workqueue.h>
#include <linux/llist.h>
#include <cluster/masklog.h>
#include "ocfs2_fs.h"
#include "ocfs2.h"
#include "alloc.h"
#include "blockcheck.h"
#include "inode.h"
#include "journal.h"
#include "file.h"
#include "sysfile.h"
#include "dlmglue.h"
#include "uptodate.h"
#include "super.h"
#include "buffer_head_io.h"
#include "quota.h"
#include "ocfs2_trace.h"
/*
* Locking of quotas with OCFS2 is rather complex. Here are rules that
* should be obeyed by all the functions:
* - any write of quota structure (either to local or global file) is protected
* by dqio_sem or dquot->dq_lock.
* - any modification of global quota file holds inode cluster lock, i_mutex,
* and ip_alloc_sem of the global quota file (achieved by
* ocfs2_lock_global_qf). It also has to hold qinfo_lock.
* - an allocation of new blocks for local quota file is protected by
* its ip_alloc_sem
*
* A rough sketch of locking dependencies (lf = local file, gf = global file):
* Normal filesystem operation:
* start_trans -> dqio_sem -> write to lf
* Syncing of local and global file:
* ocfs2_lock_global_qf -> start_trans -> dqio_sem -> qinfo_lock ->
* write to gf
* -> write to lf
* Acquire dquot for the first time:
* dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf
* -> alloc space for gf
* -> start_trans -> qinfo_lock -> write to gf
* -> ip_alloc_sem of lf -> alloc space for lf
* -> write to lf
* Release last reference to dquot:
* dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf
* -> write to lf
* Note that all the above operations also hold the inode cluster lock of lf.
* Recovery:
* inode cluster lock of recovered lf
* -> read bitmaps -> ip_alloc_sem of lf
* -> ocfs2_lock_global_qf -> start_trans -> dqio_sem -> qinfo_lock ->
* write to gf
*/
static void qsync_work_fn(struct work_struct *work);
static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
{
struct ocfs2_global_disk_dqblk *d = dp;
struct mem_dqblk *m = &dquot->dq_dqb;
/* Update from disk only entries not set by the admin */
if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
}
if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
}
if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
m->dqb_btime = le64_to_cpu(d->dqb_btime);
if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
m->dqb_itime = le64_to_cpu(d->dqb_itime);
OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
}
static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
{
struct ocfs2_global_disk_dqblk *d = dp;
struct mem_dqblk *m = &dquot->dq_dqb;
d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
d->dqb_btime = cpu_to_le64(m->dqb_btime);
d->dqb_itime = cpu_to_le64(m->dqb_itime);
d->dqb_pad1 = d->dqb_pad2 = 0;
}
static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
{
struct ocfs2_global_disk_dqblk *d = dp;
struct ocfs2_mem_dqinfo *oinfo =
sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
if (qtree_entry_unused(&oinfo->dqi_gi, dp))
return 0;
return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
le32_to_cpu(d->dqb_id)),
dquot->dq_id);
}
const struct qtree_fmt_operations ocfs2_global_ops = {
.mem2disk_dqblk = ocfs2_global_mem2diskdqb,
.disk2mem_dqblk = ocfs2_global_disk2memdqb,
.is_id = ocfs2_global_is_id,
};
int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh)
{
struct ocfs2_disk_dqtrailer *dqt =
ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr);
BUG_ON(!buffer_uptodate(bh));
/*
* If the ecc fails, we return the error but otherwise
* leave the filesystem running. We know any error is
* local to this block.
*/
return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
}
int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
struct buffer_head **bhp)
{
int rc;
*bhp = NULL;
rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0,
ocfs2_validate_quota_block);
if (rc)
mlog_errno(rc);
return rc;
}
/* Read data from global quotafile - avoid pagecache and such because we cannot
* afford acquiring the locks... We use quota cluster lock to serialize
* operations. Caller is responsible for acquiring it. */
ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
size_t len, loff_t off)
{
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
struct inode *gqinode = oinfo->dqi_gqinode;
loff_t i_size = i_size_read(gqinode);
int offset = off & (sb->s_blocksize - 1);
sector_t blk = off >> sb->s_blocksize_bits;
int err = 0;
struct buffer_head *bh;
size_t toread, tocopy;
u64 pblock = 0, pcount = 0;
if (off > i_size)
return 0;
if (off + len > i_size)
len = i_size - off;
toread = len;
while (toread > 0) {
tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
if (!pcount) {
err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock,
&pcount, NULL);
if (err) {
mlog_errno(err);
return err;
}
} else {
pcount--;
pblock++;
}
bh = NULL;
err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
if (err) {
mlog_errno(err);
return err;
}
memcpy(data, bh->b_data + offset, tocopy);
brelse(bh);
offset = 0;
toread -= tocopy;
data += tocopy;
blk++;
}
return len;
}
/* Write to quotafile (we know the transaction is already started and has
* enough credits) */
ssize_t ocfs2_quota_write(struct super_block *sb, int type,
const char *data, size_t len, loff_t off)
{
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
struct inode *gqinode = oinfo->dqi_gqinode;
int offset = off & (sb->s_blocksize - 1);
sector_t blk = off >> sb->s_blocksize_bits;
int err = 0, new = 0, ja_type;
struct buffer_head *bh = NULL;
handle_t *handle = journal_current_handle();
u64 pblock, pcount;
if (!handle) {
mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
"because transaction was not started.\n",
(unsigned long long)off, (unsigned long long)len);
return -EIO;
}
if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
WARN_ON(1);
len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
}
if (i_size_read(gqinode) < off + len) {
loff_t rounded_end =
ocfs2_align_bytes_to_blocks(sb, off + len);
/* Space is already allocated in ocfs2_acquire_dquot() */
err = ocfs2_simple_size_update(gqinode,
oinfo->dqi_gqi_bh,
rounded_end);
if (err < 0)
goto out;
new = 1;
}
err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL);
if (err) {
mlog_errno(err);
goto out;
}
/* Not rewriting whole block? */
if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
!new) {
err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
} else {
bh = sb_getblk(sb, pblock);
if (!bh)
err = -ENOMEM;
ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
}
if (err) {
mlog_errno(err);
goto out;
}
lock_buffer(bh);
if (new)
memset(bh->b_data, 0, sb->s_blocksize);
memcpy(bh->b_data + offset, data, len);
flush_dcache_page(bh->b_page);
set_buffer_uptodate(bh);
unlock_buffer(bh);
ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
ja_type);
if (err < 0) {
brelse(bh);
goto out;
}
ocfs2_journal_dirty(handle, bh);
brelse(bh);
out:
if (err) {
mlog_errno(err);
return err;
}
gqinode->i_version++;
ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
return len;
}
int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
{
int status;
struct buffer_head *bh = NULL;
status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
if (status < 0)
return status;
spin_lock(&dq_data_lock);
if (!oinfo->dqi_gqi_count++)
oinfo->dqi_gqi_bh = bh;
else
WARN_ON(bh != oinfo->dqi_gqi_bh);
spin_unlock(&dq_data_lock);
if (ex) {
inode_lock(oinfo->dqi_gqinode);
down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
} else {
down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
}
return 0;
}
void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
{
if (ex) {
up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
inode_unlock(oinfo->dqi_gqinode);
} else {
up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
}
ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
brelse(oinfo->dqi_gqi_bh);
spin_lock(&dq_data_lock);
if (!--oinfo->dqi_gqi_count)
oinfo->dqi_gqi_bh = NULL;
spin_unlock(&dq_data_lock);
}
/* Read information header from global quota file */
int ocfs2_global_read_info(struct super_block *sb, int type)
{
struct inode *gqinode = NULL;
unsigned int ino[OCFS2_MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
GROUP_QUOTA_SYSTEM_INODE };
struct ocfs2_global_disk_dqinfo dinfo;
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
u64 pcount;
int status;
/* Read global header */
gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
OCFS2_INVALID_SLOT);
if (!gqinode) {
mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
type);
status = -EINVAL;
goto out_err;
}
oinfo->dqi_gi.dqi_sb = sb;
oinfo->dqi_gi.dqi_type = type;
ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
oinfo->dqi_gqi_bh = NULL;
oinfo->dqi_gqi_count = 0;
oinfo->dqi_gqinode = gqinode;
status = ocfs2_lock_global_qf(oinfo, 0);
if (status < 0) {
mlog_errno(status);
goto out_err;
}
status = ocfs2_extent_map_get_blocks(gqinode, 0, &oinfo->dqi_giblk,
&pcount, NULL);
if (status < 0)
goto out_unlock;
status = ocfs2_qinfo_lock(oinfo, 0);
if (status < 0)
goto out_unlock;
status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
sizeof(struct ocfs2_global_disk_dqinfo),
OCFS2_GLOBAL_INFO_OFF);
ocfs2_qinfo_unlock(oinfo, 0);
ocfs2_unlock_global_qf(oinfo, 0);
if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
status);
if (status >= 0)
status = -EIO;
mlog_errno(status);
goto out_err;
}
info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
OCFS2_QBLK_RESERVED_SPACE;
oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
schedule_delayed_work(&oinfo->dqi_sync_work,
msecs_to_jiffies(oinfo->dqi_syncms));
out_err:
return status;
out_unlock:
ocfs2_unlock_global_qf(oinfo, 0);
mlog_errno(status);
goto out_err;
}
/* Write information to global quota file. Expects exlusive lock on quota
* file inode and quota info */
static int __ocfs2_global_write_info(struct super_block *sb, int type)
{
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
struct ocfs2_global_disk_dqinfo dinfo;
ssize_t size;
spin_lock(&dq_data_lock);
info->dqi_flags &= ~DQF_INFO_DIRTY;
dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
spin_unlock(&dq_data_lock);
dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
sizeof(struct ocfs2_global_disk_dqinfo),
OCFS2_GLOBAL_INFO_OFF);
if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
mlog(ML_ERROR, "Cannot write global quota info structure\n");
if (size >= 0)
size = -EIO;
return size;
}
return 0;
}
int ocfs2_global_write_info(struct super_block *sb, int type)
{
int err;
struct quota_info *dqopt = sb_dqopt(sb);
struct ocfs2_mem_dqinfo *info = dqopt->info[type].dqi_priv;
down_write(&dqopt->dqio_sem);
err = ocfs2_qinfo_lock(info, 1);
if (err < 0)
goto out_sem;
err = __ocfs2_global_write_info(sb, type);
ocfs2_qinfo_unlock(info, 1);
out_sem:
up_write(&dqopt->dqio_sem);
return err;
}
static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
{
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
/*
* We may need to allocate tree blocks and a leaf block but not the
* root block
*/
return oinfo->dqi_gi.dqi_qtree_depth;
}
static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
{
/* We modify all the allocated blocks, tree root, info block and
* the inode */
return (ocfs2_global_qinit_alloc(sb, type) + 2) *
OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
}
/* Sync local information about quota modifications with global quota file.
* Caller must have started the transaction and obtained exclusive lock for
* global quota file inode */
int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
{
int err, err2;
struct super_block *sb = dquot->dq_sb;
int type = dquot->dq_id.type;
struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
struct ocfs2_global_disk_dqblk dqblk;
s64 spacechange, inodechange;
time64_t olditime, oldbtime;
err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
sizeof(struct ocfs2_global_disk_dqblk),
dquot->dq_off);
if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
if (err >= 0) {
mlog(ML_ERROR, "Short read from global quota file "
"(%u read)\n", err);
err = -EIO;
}
goto out;
}
/* Update space and inode usage. Get also other information from
* global quota file so that we don't overwrite any changes there.
* We are */
spin_lock(&dquot->dq_dqb_lock);
spacechange = dquot->dq_dqb.dqb_curspace -
OCFS2_DQUOT(dquot)->dq_origspace;
inodechange = dquot->dq_dqb.dqb_curinodes -
OCFS2_DQUOT(dquot)->dq_originodes;
olditime = dquot->dq_dqb.dqb_itime;
oldbtime = dquot->dq_dqb.dqb_btime;
ocfs2_global_disk2memdqb(dquot, &dqblk);
trace_ocfs2_sync_dquot(from_kqid(&init_user_ns, dquot->dq_id),
dquot->dq_dqb.dqb_curspace,
(long long)spacechange,
dquot->dq_dqb.dqb_curinodes,
(long long)inodechange);
if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
dquot->dq_dqb.dqb_curspace += spacechange;
if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
dquot->dq_dqb.dqb_curinodes += inodechange;
/* Set properly space grace time... */
if (dquot->dq_dqb.dqb_bsoftlimit &&
dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
oldbtime > 0) {
if (dquot->dq_dqb.dqb_btime > 0)
dquot->dq_dqb.dqb_btime =
min(dquot->dq_dqb.dqb_btime, oldbtime);
else
dquot->dq_dqb.dqb_btime = oldbtime;
}
} else {
dquot->dq_dqb.dqb_btime = 0;
clear_bit(DQ_BLKS_B, &dquot->dq_flags);
}
/* Set properly inode grace time... */
if (dquot->dq_dqb.dqb_isoftlimit &&
dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
olditime > 0) {
if (dquot->dq_dqb.dqb_itime > 0)
dquot->dq_dqb.dqb_itime =
min(dquot->dq_dqb.dqb_itime, olditime);
else
dquot->dq_dqb.dqb_itime = olditime;
}
} else {
dquot->dq_dqb.dqb_itime = 0;
clear_bit(DQ_INODES_B, &dquot->dq_flags);
}
/* All information is properly updated, clear the flags */
__clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
__clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
spin_unlock(&dquot->dq_dqb_lock);
err = ocfs2_qinfo_lock(info, freeing);
if (err < 0) {
mlog(ML_ERROR, "Failed to lock quota info, losing quota write"
" (type=%d, id=%u)\n", dquot->dq_id.type,
(unsigned)from_kqid(&init_user_ns, dquot->dq_id));
goto out;
}
if (freeing)
OCFS2_DQUOT(dquot)->dq_use_count--;
err = qtree_write_dquot(&info->dqi_gi, dquot);
if (err < 0)
goto out_qlock;
if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
err = qtree_release_dquot(&info->dqi_gi, dquot);
if (info_dirty(sb_dqinfo(sb, type))) {
err2 = __ocfs2_global_write_info(sb, type);
if (!err)
err = err2;
}
}
out_qlock:
ocfs2_qinfo_unlock(info, freeing);
out:
if (err < 0)
mlog_errno(err);
return err;
}
/*
* Functions for periodic syncing of dquots with global file
*/
static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
{
handle_t *handle;
struct super_block *sb = dquot->dq_sb;
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
struct ocfs2_super *osb = OCFS2_SB(sb);
int status = 0;
trace_ocfs2_sync_dquot_helper(from_kqid(&init_user_ns, dquot->dq_id),
dquot->dq_id.type,
type, sb->s_id);
if (type != dquot->dq_id.type)
goto out;
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
down_write(&sb_dqopt(sb)->dqio_sem);
status = ocfs2_sync_dquot(dquot);
if (status < 0)
mlog_errno(status);
/* We have to write local structure as well... */
status = ocfs2_local_write_dquot(dquot);
if (status < 0)
mlog_errno(status);
up_write(&sb_dqopt(sb)->dqio_sem);
ocfs2_commit_trans(osb, handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
return status;
}
static void qsync_work_fn(struct work_struct *work)
{
struct ocfs2_mem_dqinfo *oinfo = container_of(work,
struct ocfs2_mem_dqinfo,
dqi_sync_work.work);
struct super_block *sb = oinfo->dqi_gqinode->i_sb;
/*
* We have to be careful here not to deadlock on s_umount as umount
* disabling quotas may be in progress and it waits for this work to
* complete. If trylock fails, we'll do the sync next time...
*/
if (down_read_trylock(&sb->s_umount)) {
dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
up_read(&sb->s_umount);
}
schedule_delayed_work(&oinfo->dqi_sync_work,
msecs_to_jiffies(oinfo->dqi_syncms));
}
/*
* Wrappers for generic quota functions
*/
static int ocfs2_write_dquot(struct dquot *dquot)
{
handle_t *handle;
struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
int status = 0;
trace_ocfs2_write_dquot(from_kqid(&init_user_ns, dquot->dq_id),
dquot->dq_id.type);
handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out;
}
down_write(&sb_dqopt(dquot->dq_sb)->dqio_sem);
status = ocfs2_local_write_dquot(dquot);
up_write(&sb_dqopt(dquot->dq_sb)->dqio_sem);
ocfs2_commit_trans(osb, handle);
out:
return status;
}
static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
{
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
/*
* We modify tree, leaf block, global info, local chunk header,
* global and local inode; OCFS2_QINFO_WRITE_CREDITS already
* accounts for inode update
*/
return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
OCFS2_QINFO_WRITE_CREDITS +
OCFS2_INODE_UPDATE_CREDITS;
}
void ocfs2_drop_dquot_refs(struct work_struct *work)
{
struct ocfs2_super *osb = container_of(work, struct ocfs2_super,
dquot_drop_work);
struct llist_node *list;
struct ocfs2_dquot *odquot, *next_odquot;
list = llist_del_all(&osb->dquot_drop_list);
llist_for_each_entry_safe(odquot, next_odquot, list, list) {
/* Drop the reference we acquired in ocfs2_dquot_release() */
dqput(&odquot->dq_dquot);
}
}
/*
* Called when the last reference to dquot is dropped. If we are called from
* downconvert thread, we cannot do all the handling here because grabbing
* quota lock could deadlock (the node holding the quota lock could need some
* other cluster lock to proceed but with blocked downconvert thread we cannot
* release any lock).
*/
static int ocfs2_release_dquot(struct dquot *dquot)
{
handle_t *handle;
struct ocfs2_mem_dqinfo *oinfo =
sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
int status = 0;
trace_ocfs2_release_dquot(from_kqid(&init_user_ns, dquot->dq_id),
dquot->dq_id.type);
mutex_lock(&dquot->dq_lock);
/* Check whether we are not racing with some other dqget() */
if (atomic_read(&dquot->dq_count) > 1)
goto out;
/* Running from downconvert thread? Postpone quota processing to wq */
if (current == osb->dc_task) {
/*
* Grab our own reference to dquot and queue it for delayed
* dropping. Quota code rechecks after calling
* ->release_dquot() and won't free dquot structure.
*/
dqgrab(dquot);
/* First entry on list -> queue work */
if (llist_add(&OCFS2_DQUOT(dquot)->list, &osb->dquot_drop_list))
queue_work(osb->ocfs2_wq, &osb->dquot_drop_work);
goto out;
}
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(osb,
ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_id.type));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
status = ocfs2_global_release_dquot(dquot);
if (status < 0) {
mlog_errno(status);
goto out_trans;
}
status = ocfs2_local_release_dquot(handle, dquot);
/*
* If we fail here, we cannot do much as global structure is
* already released. So just complain...
*/
if (status < 0)
mlog_errno(status);
/*
* Clear dq_off so that we search for the structure in quota file next
* time we acquire it. The structure might be deleted and reallocated
* elsewhere by another node while our dquot structure is on freelist.
*/
dquot->dq_off = 0;
clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
out_trans:
ocfs2_commit_trans(osb, handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
mutex_unlock(&dquot->dq_lock);
if (status)
mlog_errno(status);
return status;
}
/*
* Read global dquot structure from disk or create it if it does
* not exist. Also update use count of the global structure and
* create structure in node-local quota file.
*/
static int ocfs2_acquire_dquot(struct dquot *dquot)
{
int status = 0, err;
int ex = 0;
struct super_block *sb = dquot->dq_sb;
struct ocfs2_super *osb = OCFS2_SB(sb);
int type = dquot->dq_id.type;
struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
struct inode *gqinode = info->dqi_gqinode;
int need_alloc = ocfs2_global_qinit_alloc(sb, type);
handle_t *handle;
trace_ocfs2_acquire_dquot(from_kqid(&init_user_ns, dquot->dq_id),
type);
mutex_lock(&dquot->dq_lock);
/*
* We need an exclusive lock, because we're going to update use count
* and instantiate possibly new dquot structure
*/
status = ocfs2_lock_global_qf(info, 1);
if (status < 0)
goto out;
status = ocfs2_qinfo_lock(info, 0);
if (status < 0)
goto out_dq;
/*
* We always want to read dquot structure from disk because we don't
* know what happened with it while it was on freelist.
*/
status = qtree_read_dquot(&info->dqi_gi, dquot);
ocfs2_qinfo_unlock(info, 0);
if (status < 0)
goto out_dq;
OCFS2_DQUOT(dquot)->dq_use_count++;
OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
if (!dquot->dq_off) { /* No real quota entry? */
ex = 1;
/*
* Add blocks to quota file before we start a transaction since
* locking allocators ranks above a transaction start
*/
WARN_ON(journal_current_handle());
status = ocfs2_extend_no_holes(gqinode, NULL,
i_size_read(gqinode) + (need_alloc << sb->s_blocksize_bits),
i_size_read(gqinode));
if (status < 0)
goto out_dq;
}
handle = ocfs2_start_trans(osb,
ocfs2_calc_global_qinit_credits(sb, type));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
goto out_dq;
}
status = ocfs2_qinfo_lock(info, ex);
if (status < 0)
goto out_trans;
status = qtree_write_dquot(&info->dqi_gi, dquot);
if (ex && info_dirty(sb_dqinfo(sb, type))) {
err = __ocfs2_global_write_info(sb, type);
if (!status)
status = err;
}
ocfs2_qinfo_unlock(info, ex);
out_trans:
ocfs2_commit_trans(osb, handle);
out_dq:
ocfs2_unlock_global_qf(info, 1);
if (status < 0)
goto out;
status = ocfs2_create_local_dquot(dquot);
if (status < 0)
goto out;
set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
out:
mutex_unlock(&dquot->dq_lock);
if (status)
mlog_errno(status);
return status;
}
static int ocfs2_get_next_id(struct super_block *sb, struct kqid *qid)
{
int type = qid->type;
struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
int status = 0;
trace_ocfs2_get_next_id(from_kqid(&init_user_ns, *qid), type);
if (!sb_has_quota_loaded(sb, type)) {
status = -ESRCH;
goto out;
}
status = ocfs2_lock_global_qf(info, 0);
if (status < 0)
goto out;
status = ocfs2_qinfo_lock(info, 0);
if (status < 0)
goto out_global;
status = qtree_get_next_id(&info->dqi_gi, qid);
ocfs2_qinfo_unlock(info, 0);
out_global:
ocfs2_unlock_global_qf(info, 0);
out:
/*
* Avoid logging ENOENT since it just means there isn't next ID and
* ESRCH which means quota isn't enabled for the filesystem.
*/
if (status && status != -ENOENT && status != -ESRCH)
mlog_errno(status);
return status;
}
static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
{
unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
(1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
(1 << (DQ_LASTSET_B + QIF_INODES_B)) |
(1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
(1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
(1 << (DQ_LASTSET_B + QIF_ITIME_B));
int sync = 0;
int status;
struct super_block *sb = dquot->dq_sb;
int type = dquot->dq_id.type;
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
handle_t *handle;
struct ocfs2_super *osb = OCFS2_SB(sb);
trace_ocfs2_mark_dquot_dirty(from_kqid(&init_user_ns, dquot->dq_id),
type);
/* In case user set some limits, sync dquot immediately to global
* quota file so that information propagates quicker */
spin_lock(&dquot->dq_dqb_lock);
if (dquot->dq_flags & mask)
sync = 1;
spin_unlock(&dquot->dq_dqb_lock);
/* This is a slight hack but we can't afford getting global quota
* lock if we already have a transaction started. */
if (!sync || journal_current_handle()) {
status = ocfs2_write_dquot(dquot);
goto out;
}
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
down_write(&sb_dqopt(sb)->dqio_sem);
status = ocfs2_sync_dquot(dquot);
if (status < 0) {
mlog_errno(status);
goto out_dlock;
}
/* Now write updated local dquot structure */
status = ocfs2_local_write_dquot(dquot);
out_dlock:
up_write(&sb_dqopt(sb)->dqio_sem);
ocfs2_commit_trans(osb, handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
if (status)
mlog_errno(status);
return status;
}
/* This should happen only after set_dqinfo(). */
static int ocfs2_write_info(struct super_block *sb, int type)
{
handle_t *handle;
int status = 0;
struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
status = ocfs2_lock_global_qf(oinfo, 1);
if (status < 0)
goto out;
handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto out_ilock;
}
status = dquot_commit_info(sb, type);
ocfs2_commit_trans(OCFS2_SB(sb), handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
out:
if (status)
mlog_errno(status);
return status;
}
static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
{
struct ocfs2_dquot *dquot =
kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
if (!dquot)
return NULL;
return &dquot->dq_dquot;
}
static void ocfs2_destroy_dquot(struct dquot *dquot)
{
kmem_cache_free(ocfs2_dquot_cachep, dquot);
}
const struct dquot_operations ocfs2_quota_operations = {
/* We never make dquot dirty so .write_dquot is never called */
.acquire_dquot = ocfs2_acquire_dquot,
.release_dquot = ocfs2_release_dquot,
.mark_dirty = ocfs2_mark_dquot_dirty,
.write_info = ocfs2_write_info,
.alloc_dquot = ocfs2_alloc_dquot,
.destroy_dquot = ocfs2_destroy_dquot,
.get_next_id = ocfs2_get_next_id,
};
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