414 lines
12 KiB
C
414 lines
12 KiB
C
/*
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* vfsv0 quota IO operations on file
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*/
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/dqblk_v2.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/quotaops.h>
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#include <asm/byteorder.h>
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#include "quota_tree.h"
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#include "quotaio_v2.h"
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MODULE_AUTHOR("Jan Kara");
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MODULE_DESCRIPTION("Quota format v2 support");
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MODULE_LICENSE("GPL");
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#define __QUOTA_V2_PARANOIA
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static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot);
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static void v2r0_disk2memdqb(struct dquot *dquot, void *dp);
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static int v2r0_is_id(void *dp, struct dquot *dquot);
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static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot);
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static void v2r1_disk2memdqb(struct dquot *dquot, void *dp);
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static int v2r1_is_id(void *dp, struct dquot *dquot);
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static const struct qtree_fmt_operations v2r0_qtree_ops = {
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.mem2disk_dqblk = v2r0_mem2diskdqb,
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.disk2mem_dqblk = v2r0_disk2memdqb,
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.is_id = v2r0_is_id,
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};
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static const struct qtree_fmt_operations v2r1_qtree_ops = {
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.mem2disk_dqblk = v2r1_mem2diskdqb,
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.disk2mem_dqblk = v2r1_disk2memdqb,
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.is_id = v2r1_is_id,
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};
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#define QUOTABLOCK_BITS 10
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#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
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static inline qsize_t v2_stoqb(qsize_t space)
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{
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return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
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}
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static inline qsize_t v2_qbtos(qsize_t blocks)
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{
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return blocks << QUOTABLOCK_BITS;
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}
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static int v2_read_header(struct super_block *sb, int type,
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struct v2_disk_dqheader *dqhead)
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{
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ssize_t size;
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size = sb->s_op->quota_read(sb, type, (char *)dqhead,
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sizeof(struct v2_disk_dqheader), 0);
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if (size != sizeof(struct v2_disk_dqheader)) {
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quota_error(sb, "Failed header read: expected=%zd got=%zd",
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sizeof(struct v2_disk_dqheader), size);
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if (size < 0)
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return size;
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return -EIO;
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}
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return 0;
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}
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/* Check whether given file is really vfsv0 quotafile */
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static int v2_check_quota_file(struct super_block *sb, int type)
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{
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struct v2_disk_dqheader dqhead;
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static const uint quota_magics[] = V2_INITQMAGICS;
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static const uint quota_versions[] = V2_INITQVERSIONS;
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if (v2_read_header(sb, type, &dqhead))
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return 0;
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if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] ||
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le32_to_cpu(dqhead.dqh_version) > quota_versions[type])
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return 0;
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return 1;
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}
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/* Read information header from quota file */
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static int v2_read_file_info(struct super_block *sb, int type)
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{
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struct v2_disk_dqinfo dinfo;
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struct v2_disk_dqheader dqhead;
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struct quota_info *dqopt = sb_dqopt(sb);
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struct mem_dqinfo *info = &dqopt->info[type];
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struct qtree_mem_dqinfo *qinfo;
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ssize_t size;
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unsigned int version;
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int ret;
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down_read(&dqopt->dqio_sem);
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ret = v2_read_header(sb, type, &dqhead);
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if (ret < 0)
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goto out;
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version = le32_to_cpu(dqhead.dqh_version);
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if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) ||
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(info->dqi_fmt_id == QFMT_VFS_V1 && version != 1)) {
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ret = -EINVAL;
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goto out;
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}
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size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
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sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
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if (size != sizeof(struct v2_disk_dqinfo)) {
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quota_error(sb, "Can't read info structure");
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if (size < 0)
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ret = size;
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else
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ret = -EIO;
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goto out;
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}
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info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
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if (!info->dqi_priv) {
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ret = -ENOMEM;
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goto out;
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}
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qinfo = info->dqi_priv;
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if (version == 0) {
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/* limits are stored as unsigned 32-bit data */
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info->dqi_max_spc_limit = 0xffffffffLL << QUOTABLOCK_BITS;
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info->dqi_max_ino_limit = 0xffffffff;
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} else {
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/*
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* Used space is stored as unsigned 64-bit value in bytes but
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* quota core supports only signed 64-bit values so use that
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* as a limit
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*/
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info->dqi_max_spc_limit = 0x7fffffffffffffffLL; /* 2^63-1 */
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info->dqi_max_ino_limit = 0x7fffffffffffffffLL;
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}
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info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
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info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
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/* No flags currently supported */
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info->dqi_flags = 0;
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qinfo->dqi_sb = sb;
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qinfo->dqi_type = type;
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qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
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qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
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qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
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qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
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qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
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qinfo->dqi_qtree_depth = qtree_depth(qinfo);
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if (version == 0) {
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qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk);
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qinfo->dqi_ops = &v2r0_qtree_ops;
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} else {
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qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk);
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qinfo->dqi_ops = &v2r1_qtree_ops;
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}
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ret = 0;
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out:
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up_read(&dqopt->dqio_sem);
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return ret;
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}
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/* Write information header to quota file */
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static int v2_write_file_info(struct super_block *sb, int type)
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{
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struct v2_disk_dqinfo dinfo;
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struct quota_info *dqopt = sb_dqopt(sb);
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struct mem_dqinfo *info = &dqopt->info[type];
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struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
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ssize_t size;
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down_write(&dqopt->dqio_sem);
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spin_lock(&dq_data_lock);
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info->dqi_flags &= ~DQF_INFO_DIRTY;
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dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
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dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
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/* No flags currently supported */
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dinfo.dqi_flags = cpu_to_le32(0);
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spin_unlock(&dq_data_lock);
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dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks);
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dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);
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dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry);
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size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
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sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
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up_write(&dqopt->dqio_sem);
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if (size != sizeof(struct v2_disk_dqinfo)) {
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quota_error(sb, "Can't write info structure");
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return -1;
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}
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return 0;
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}
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static void v2r0_disk2memdqb(struct dquot *dquot, void *dp)
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{
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struct v2r0_disk_dqblk *d = dp, empty;
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struct mem_dqblk *m = &dquot->dq_dqb;
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m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
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m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
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m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
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m->dqb_itime = le64_to_cpu(d->dqb_itime);
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m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
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m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
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m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
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m->dqb_btime = le64_to_cpu(d->dqb_btime);
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/* We need to escape back all-zero structure */
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memset(&empty, 0, sizeof(struct v2r0_disk_dqblk));
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empty.dqb_itime = cpu_to_le64(1);
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if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk)))
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m->dqb_itime = 0;
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}
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static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot)
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{
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struct v2r0_disk_dqblk *d = dp;
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struct mem_dqblk *m = &dquot->dq_dqb;
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struct qtree_mem_dqinfo *info =
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sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
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d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
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d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
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d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
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d->dqb_itime = cpu_to_le64(m->dqb_itime);
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d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit));
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d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit));
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d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
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d->dqb_btime = cpu_to_le64(m->dqb_btime);
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d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
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if (qtree_entry_unused(info, dp))
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d->dqb_itime = cpu_to_le64(1);
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}
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static int v2r0_is_id(void *dp, struct dquot *dquot)
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{
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struct v2r0_disk_dqblk *d = dp;
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struct qtree_mem_dqinfo *info =
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sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
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if (qtree_entry_unused(info, dp))
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return 0;
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return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
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le32_to_cpu(d->dqb_id)),
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dquot->dq_id);
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}
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static void v2r1_disk2memdqb(struct dquot *dquot, void *dp)
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{
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struct v2r1_disk_dqblk *d = dp, empty;
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struct mem_dqblk *m = &dquot->dq_dqb;
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m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
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m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
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m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
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m->dqb_itime = le64_to_cpu(d->dqb_itime);
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m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit));
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m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit));
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m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
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m->dqb_btime = le64_to_cpu(d->dqb_btime);
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/* We need to escape back all-zero structure */
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memset(&empty, 0, sizeof(struct v2r1_disk_dqblk));
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empty.dqb_itime = cpu_to_le64(1);
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if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk)))
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m->dqb_itime = 0;
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}
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static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot)
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{
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struct v2r1_disk_dqblk *d = dp;
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struct mem_dqblk *m = &dquot->dq_dqb;
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struct qtree_mem_dqinfo *info =
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sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
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d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
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d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
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d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
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d->dqb_itime = cpu_to_le64(m->dqb_itime);
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d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit));
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d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit));
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d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
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d->dqb_btime = cpu_to_le64(m->dqb_btime);
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d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
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if (qtree_entry_unused(info, dp))
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d->dqb_itime = cpu_to_le64(1);
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}
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static int v2r1_is_id(void *dp, struct dquot *dquot)
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{
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struct v2r1_disk_dqblk *d = dp;
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struct qtree_mem_dqinfo *info =
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sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
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if (qtree_entry_unused(info, dp))
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return 0;
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return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
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le32_to_cpu(d->dqb_id)),
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dquot->dq_id);
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}
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static int v2_read_dquot(struct dquot *dquot)
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{
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struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
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int ret;
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down_read(&dqopt->dqio_sem);
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ret = qtree_read_dquot(
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sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
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dquot);
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up_read(&dqopt->dqio_sem);
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return ret;
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}
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static int v2_write_dquot(struct dquot *dquot)
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{
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struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
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int ret;
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bool alloc = false;
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/*
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* If space for dquot is already allocated, we don't need any
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* protection as we'll only overwrite the place of dquot. We are
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* still protected by concurrent writes of the same dquot by
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* dquot->dq_lock.
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*/
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if (!dquot->dq_off) {
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alloc = true;
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down_write(&dqopt->dqio_sem);
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} else {
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down_read(&dqopt->dqio_sem);
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}
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ret = qtree_write_dquot(
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sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
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dquot);
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if (alloc)
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up_write(&dqopt->dqio_sem);
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else
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up_read(&dqopt->dqio_sem);
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return ret;
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}
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static int v2_release_dquot(struct dquot *dquot)
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{
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struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
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int ret;
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down_write(&dqopt->dqio_sem);
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ret = qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
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up_write(&dqopt->dqio_sem);
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return ret;
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}
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static int v2_free_file_info(struct super_block *sb, int type)
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{
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kfree(sb_dqinfo(sb, type)->dqi_priv);
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return 0;
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}
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static int v2_get_next_id(struct super_block *sb, struct kqid *qid)
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{
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struct quota_info *dqopt = sb_dqopt(sb);
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int ret;
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down_read(&dqopt->dqio_sem);
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ret = qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid);
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up_read(&dqopt->dqio_sem);
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return ret;
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}
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static const struct quota_format_ops v2_format_ops = {
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.check_quota_file = v2_check_quota_file,
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.read_file_info = v2_read_file_info,
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.write_file_info = v2_write_file_info,
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.free_file_info = v2_free_file_info,
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.read_dqblk = v2_read_dquot,
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.commit_dqblk = v2_write_dquot,
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.release_dqblk = v2_release_dquot,
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.get_next_id = v2_get_next_id,
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};
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static struct quota_format_type v2r0_quota_format = {
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.qf_fmt_id = QFMT_VFS_V0,
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.qf_ops = &v2_format_ops,
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.qf_owner = THIS_MODULE
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};
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static struct quota_format_type v2r1_quota_format = {
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.qf_fmt_id = QFMT_VFS_V1,
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.qf_ops = &v2_format_ops,
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.qf_owner = THIS_MODULE
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};
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static int __init init_v2_quota_format(void)
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{
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int ret;
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ret = register_quota_format(&v2r0_quota_format);
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if (ret)
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return ret;
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return register_quota_format(&v2r1_quota_format);
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}
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static void __exit exit_v2_quota_format(void)
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{
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unregister_quota_format(&v2r0_quota_format);
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unregister_quota_format(&v2r1_quota_format);
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}
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module_init(init_v2_quota_format);
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module_exit(exit_v2_quota_format);
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