696 lines
20 KiB
C
696 lines
20 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/quotaio_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 <asm/byteorder.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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typedef char *dqbuf_t;
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#define GETIDINDEX(id, depth) (((id) >> ((V2_DQTREEDEPTH-(depth)-1)*8)) & 0xff)
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#define GETENTRIES(buf) ((struct v2_disk_dqblk *)(((char *)buf)+sizeof(struct v2_disk_dqdbheader)))
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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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ssize_t size;
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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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size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);
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if (size != sizeof(struct v2_disk_dqheader)) {
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printk("quota_v2: failed read expected=%zd got=%zd\n",
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sizeof(struct v2_disk_dqheader), size);
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return 0;
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}
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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 mem_dqinfo *info = sb_dqopt(sb)->info+type;
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ssize_t size;
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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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printk(KERN_WARNING "Can't read info structure on device %s.\n",
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sb->s_id);
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return -1;
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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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info->dqi_flags = le32_to_cpu(dinfo.dqi_flags);
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info->u.v2_i.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
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info->u.v2_i.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
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info->u.v2_i.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
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return 0;
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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 mem_dqinfo *info = sb_dqopt(sb)->info+type;
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ssize_t size;
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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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dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
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spin_unlock(&dq_data_lock);
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dinfo.dqi_blocks = cpu_to_le32(info->u.v2_i.dqi_blocks);
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dinfo.dqi_free_blk = cpu_to_le32(info->u.v2_i.dqi_free_blk);
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dinfo.dqi_free_entry = cpu_to_le32(info->u.v2_i.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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if (size != sizeof(struct v2_disk_dqinfo)) {
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printk(KERN_WARNING "Can't write info structure on device %s.\n",
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sb->s_id);
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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 disk2memdqb(struct mem_dqblk *m, struct v2_disk_dqblk *d)
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{
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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 = le32_to_cpu(d->dqb_bhardlimit);
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m->dqb_bsoftlimit = 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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}
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static void mem2diskdqb(struct v2_disk_dqblk *d, struct mem_dqblk *m, qid_t id)
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{
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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(m->dqb_bhardlimit);
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d->dqb_bsoftlimit = cpu_to_le32(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(id);
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}
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static dqbuf_t getdqbuf(void)
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{
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dqbuf_t buf = kmalloc(V2_DQBLKSIZE, GFP_NOFS);
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if (!buf)
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printk(KERN_WARNING "VFS: Not enough memory for quota buffers.\n");
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return buf;
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}
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static inline void freedqbuf(dqbuf_t buf)
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{
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kfree(buf);
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}
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static inline ssize_t read_blk(struct super_block *sb, int type, uint blk, dqbuf_t buf)
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{
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memset(buf, 0, V2_DQBLKSIZE);
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return sb->s_op->quota_read(sb, type, (char *)buf,
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V2_DQBLKSIZE, blk << V2_DQBLKSIZE_BITS);
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}
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static inline ssize_t write_blk(struct super_block *sb, int type, uint blk, dqbuf_t buf)
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{
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return sb->s_op->quota_write(sb, type, (char *)buf,
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V2_DQBLKSIZE, blk << V2_DQBLKSIZE_BITS);
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}
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/* Remove empty block from list and return it */
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static int get_free_dqblk(struct super_block *sb, int type)
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{
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dqbuf_t buf = getdqbuf();
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struct mem_dqinfo *info = sb_dqinfo(sb, type);
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struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf;
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int ret, blk;
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if (!buf)
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return -ENOMEM;
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if (info->u.v2_i.dqi_free_blk) {
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blk = info->u.v2_i.dqi_free_blk;
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if ((ret = read_blk(sb, type, blk, buf)) < 0)
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goto out_buf;
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info->u.v2_i.dqi_free_blk = le32_to_cpu(dh->dqdh_next_free);
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}
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else {
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memset(buf, 0, V2_DQBLKSIZE);
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/* Assure block allocation... */
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if ((ret = write_blk(sb, type, info->u.v2_i.dqi_blocks, buf)) < 0)
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goto out_buf;
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blk = info->u.v2_i.dqi_blocks++;
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}
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mark_info_dirty(sb, type);
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ret = blk;
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out_buf:
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freedqbuf(buf);
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return ret;
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}
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/* Insert empty block to the list */
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static int put_free_dqblk(struct super_block *sb, int type, dqbuf_t buf, uint blk)
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{
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struct mem_dqinfo *info = sb_dqinfo(sb, type);
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struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf;
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int err;
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dh->dqdh_next_free = cpu_to_le32(info->u.v2_i.dqi_free_blk);
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dh->dqdh_prev_free = cpu_to_le32(0);
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dh->dqdh_entries = cpu_to_le16(0);
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info->u.v2_i.dqi_free_blk = blk;
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mark_info_dirty(sb, type);
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/* Some strange block. We had better leave it... */
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if ((err = write_blk(sb, type, blk, buf)) < 0)
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return err;
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return 0;
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}
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/* Remove given block from the list of blocks with free entries */
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static int remove_free_dqentry(struct super_block *sb, int type, dqbuf_t buf, uint blk)
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{
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dqbuf_t tmpbuf = getdqbuf();
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struct mem_dqinfo *info = sb_dqinfo(sb, type);
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struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf;
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uint nextblk = le32_to_cpu(dh->dqdh_next_free), prevblk = le32_to_cpu(dh->dqdh_prev_free);
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int err;
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if (!tmpbuf)
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return -ENOMEM;
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if (nextblk) {
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if ((err = read_blk(sb, type, nextblk, tmpbuf)) < 0)
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goto out_buf;
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((struct v2_disk_dqdbheader *)tmpbuf)->dqdh_prev_free = dh->dqdh_prev_free;
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if ((err = write_blk(sb, type, nextblk, tmpbuf)) < 0)
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goto out_buf;
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}
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if (prevblk) {
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if ((err = read_blk(sb, type, prevblk, tmpbuf)) < 0)
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goto out_buf;
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((struct v2_disk_dqdbheader *)tmpbuf)->dqdh_next_free = dh->dqdh_next_free;
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if ((err = write_blk(sb, type, prevblk, tmpbuf)) < 0)
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goto out_buf;
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}
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else {
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info->u.v2_i.dqi_free_entry = nextblk;
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mark_info_dirty(sb, type);
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}
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freedqbuf(tmpbuf);
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dh->dqdh_next_free = dh->dqdh_prev_free = cpu_to_le32(0);
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/* No matter whether write succeeds block is out of list */
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if (write_blk(sb, type, blk, buf) < 0)
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printk(KERN_ERR "VFS: Can't write block (%u) with free entries.\n", blk);
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return 0;
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out_buf:
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freedqbuf(tmpbuf);
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return err;
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}
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/* Insert given block to the beginning of list with free entries */
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static int insert_free_dqentry(struct super_block *sb, int type, dqbuf_t buf, uint blk)
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{
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dqbuf_t tmpbuf = getdqbuf();
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struct mem_dqinfo *info = sb_dqinfo(sb, type);
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struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf;
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int err;
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if (!tmpbuf)
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return -ENOMEM;
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dh->dqdh_next_free = cpu_to_le32(info->u.v2_i.dqi_free_entry);
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dh->dqdh_prev_free = cpu_to_le32(0);
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if ((err = write_blk(sb, type, blk, buf)) < 0)
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goto out_buf;
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if (info->u.v2_i.dqi_free_entry) {
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if ((err = read_blk(sb, type, info->u.v2_i.dqi_free_entry, tmpbuf)) < 0)
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goto out_buf;
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((struct v2_disk_dqdbheader *)tmpbuf)->dqdh_prev_free = cpu_to_le32(blk);
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if ((err = write_blk(sb, type, info->u.v2_i.dqi_free_entry, tmpbuf)) < 0)
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goto out_buf;
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}
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freedqbuf(tmpbuf);
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info->u.v2_i.dqi_free_entry = blk;
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mark_info_dirty(sb, type);
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return 0;
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out_buf:
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freedqbuf(tmpbuf);
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return err;
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}
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/* Find space for dquot */
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static uint find_free_dqentry(struct dquot *dquot, int *err)
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{
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struct super_block *sb = dquot->dq_sb;
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struct mem_dqinfo *info = sb_dqopt(sb)->info+dquot->dq_type;
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uint blk, i;
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struct v2_disk_dqdbheader *dh;
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struct v2_disk_dqblk *ddquot;
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struct v2_disk_dqblk fakedquot;
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dqbuf_t buf;
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*err = 0;
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if (!(buf = getdqbuf())) {
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*err = -ENOMEM;
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return 0;
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}
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dh = (struct v2_disk_dqdbheader *)buf;
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ddquot = GETENTRIES(buf);
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if (info->u.v2_i.dqi_free_entry) {
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blk = info->u.v2_i.dqi_free_entry;
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if ((*err = read_blk(sb, dquot->dq_type, blk, buf)) < 0)
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goto out_buf;
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}
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else {
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blk = get_free_dqblk(sb, dquot->dq_type);
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if ((int)blk < 0) {
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*err = blk;
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freedqbuf(buf);
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return 0;
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}
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memset(buf, 0, V2_DQBLKSIZE);
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/* This is enough as block is already zeroed and entry list is empty... */
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info->u.v2_i.dqi_free_entry = blk;
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mark_info_dirty(sb, dquot->dq_type);
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}
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if (le16_to_cpu(dh->dqdh_entries)+1 >= V2_DQSTRINBLK) /* Block will be full? */
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if ((*err = remove_free_dqentry(sb, dquot->dq_type, buf, blk)) < 0) {
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printk(KERN_ERR "VFS: find_free_dqentry(): Can't remove block (%u) from entry free list.\n", blk);
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goto out_buf;
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}
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dh->dqdh_entries = cpu_to_le16(le16_to_cpu(dh->dqdh_entries)+1);
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memset(&fakedquot, 0, sizeof(struct v2_disk_dqblk));
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/* Find free structure in block */
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for (i = 0; i < V2_DQSTRINBLK && memcmp(&fakedquot, ddquot+i, sizeof(struct v2_disk_dqblk)); i++);
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#ifdef __QUOTA_V2_PARANOIA
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if (i == V2_DQSTRINBLK) {
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printk(KERN_ERR "VFS: find_free_dqentry(): Data block full but it shouldn't.\n");
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*err = -EIO;
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goto out_buf;
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}
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#endif
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if ((*err = write_blk(sb, dquot->dq_type, blk, buf)) < 0) {
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printk(KERN_ERR "VFS: find_free_dqentry(): Can't write quota data block %u.\n", blk);
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goto out_buf;
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}
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dquot->dq_off = (blk<<V2_DQBLKSIZE_BITS)+sizeof(struct v2_disk_dqdbheader)+i*sizeof(struct v2_disk_dqblk);
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freedqbuf(buf);
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return blk;
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out_buf:
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freedqbuf(buf);
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return 0;
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}
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/* Insert reference to structure into the trie */
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static int do_insert_tree(struct dquot *dquot, uint *treeblk, int depth)
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{
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struct super_block *sb = dquot->dq_sb;
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dqbuf_t buf;
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int ret = 0, newson = 0, newact = 0;
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__le32 *ref;
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uint newblk;
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if (!(buf = getdqbuf()))
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return -ENOMEM;
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if (!*treeblk) {
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ret = get_free_dqblk(sb, dquot->dq_type);
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if (ret < 0)
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goto out_buf;
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*treeblk = ret;
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memset(buf, 0, V2_DQBLKSIZE);
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newact = 1;
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}
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else {
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if ((ret = read_blk(sb, dquot->dq_type, *treeblk, buf)) < 0) {
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printk(KERN_ERR "VFS: Can't read tree quota block %u.\n", *treeblk);
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goto out_buf;
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}
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}
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ref = (__le32 *)buf;
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newblk = le32_to_cpu(ref[GETIDINDEX(dquot->dq_id, depth)]);
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if (!newblk)
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newson = 1;
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if (depth == V2_DQTREEDEPTH-1) {
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#ifdef __QUOTA_V2_PARANOIA
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if (newblk) {
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printk(KERN_ERR "VFS: Inserting already present quota entry (block %u).\n", le32_to_cpu(ref[GETIDINDEX(dquot->dq_id, depth)]));
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ret = -EIO;
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goto out_buf;
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}
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#endif
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newblk = find_free_dqentry(dquot, &ret);
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}
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else
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ret = do_insert_tree(dquot, &newblk, depth+1);
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if (newson && ret >= 0) {
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ref[GETIDINDEX(dquot->dq_id, depth)] = cpu_to_le32(newblk);
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ret = write_blk(sb, dquot->dq_type, *treeblk, buf);
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}
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else if (newact && ret < 0)
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put_free_dqblk(sb, dquot->dq_type, buf, *treeblk);
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out_buf:
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freedqbuf(buf);
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return ret;
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}
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/* Wrapper for inserting quota structure into tree */
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static inline int dq_insert_tree(struct dquot *dquot)
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{
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int tmp = V2_DQTREEOFF;
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return do_insert_tree(dquot, &tmp, 0);
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}
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/*
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* We don't have to be afraid of deadlocks as we never have quotas on quota files...
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*/
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static int v2_write_dquot(struct dquot *dquot)
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{
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int type = dquot->dq_type;
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ssize_t ret;
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struct v2_disk_dqblk ddquot, empty;
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/* dq_off is guarded by dqio_mutex */
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if (!dquot->dq_off)
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if ((ret = dq_insert_tree(dquot)) < 0) {
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printk(KERN_ERR "VFS: Error %zd occurred while creating quota.\n", ret);
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return ret;
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}
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spin_lock(&dq_data_lock);
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mem2diskdqb(&ddquot, &dquot->dq_dqb, dquot->dq_id);
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/* Argh... We may need to write structure full of zeroes but that would be
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* treated as an empty place by the rest of the code. Format change would
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* be definitely cleaner but the problems probably are not worth it */
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memset(&empty, 0, sizeof(struct v2_disk_dqblk));
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if (!memcmp(&empty, &ddquot, sizeof(struct v2_disk_dqblk)))
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ddquot.dqb_itime = cpu_to_le64(1);
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spin_unlock(&dq_data_lock);
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ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type,
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(char *)&ddquot, sizeof(struct v2_disk_dqblk), dquot->dq_off);
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if (ret != sizeof(struct v2_disk_dqblk)) {
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printk(KERN_WARNING "VFS: dquota write failed on dev %s\n", dquot->dq_sb->s_id);
|
|
if (ret >= 0)
|
|
ret = -ENOSPC;
|
|
}
|
|
else
|
|
ret = 0;
|
|
dqstats.writes++;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Free dquot entry in data block */
|
|
static int free_dqentry(struct dquot *dquot, uint blk)
|
|
{
|
|
struct super_block *sb = dquot->dq_sb;
|
|
int type = dquot->dq_type;
|
|
struct v2_disk_dqdbheader *dh;
|
|
dqbuf_t buf = getdqbuf();
|
|
int ret = 0;
|
|
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
if (dquot->dq_off >> V2_DQBLKSIZE_BITS != blk) {
|
|
printk(KERN_ERR "VFS: Quota structure has offset to other "
|
|
"block (%u) than it should (%u).\n", blk,
|
|
(uint)(dquot->dq_off >> V2_DQBLKSIZE_BITS));
|
|
goto out_buf;
|
|
}
|
|
if ((ret = read_blk(sb, type, blk, buf)) < 0) {
|
|
printk(KERN_ERR "VFS: Can't read quota data block %u\n", blk);
|
|
goto out_buf;
|
|
}
|
|
dh = (struct v2_disk_dqdbheader *)buf;
|
|
dh->dqdh_entries = cpu_to_le16(le16_to_cpu(dh->dqdh_entries)-1);
|
|
if (!le16_to_cpu(dh->dqdh_entries)) { /* Block got free? */
|
|
if ((ret = remove_free_dqentry(sb, type, buf, blk)) < 0 ||
|
|
(ret = put_free_dqblk(sb, type, buf, blk)) < 0) {
|
|
printk(KERN_ERR "VFS: Can't move quota data block (%u) "
|
|
"to free list.\n", blk);
|
|
goto out_buf;
|
|
}
|
|
}
|
|
else {
|
|
memset(buf+(dquot->dq_off & ((1 << V2_DQBLKSIZE_BITS)-1)), 0,
|
|
sizeof(struct v2_disk_dqblk));
|
|
if (le16_to_cpu(dh->dqdh_entries) == V2_DQSTRINBLK-1) {
|
|
/* Insert will write block itself */
|
|
if ((ret = insert_free_dqentry(sb, type, buf, blk)) < 0) {
|
|
printk(KERN_ERR "VFS: Can't insert quota data block (%u) to free entry list.\n", blk);
|
|
goto out_buf;
|
|
}
|
|
}
|
|
else
|
|
if ((ret = write_blk(sb, type, blk, buf)) < 0) {
|
|
printk(KERN_ERR "VFS: Can't write quota data "
|
|
"block %u\n", blk);
|
|
goto out_buf;
|
|
}
|
|
}
|
|
dquot->dq_off = 0; /* Quota is now unattached */
|
|
out_buf:
|
|
freedqbuf(buf);
|
|
return ret;
|
|
}
|
|
|
|
/* Remove reference to dquot from tree */
|
|
static int remove_tree(struct dquot *dquot, uint *blk, int depth)
|
|
{
|
|
struct super_block *sb = dquot->dq_sb;
|
|
int type = dquot->dq_type;
|
|
dqbuf_t buf = getdqbuf();
|
|
int ret = 0;
|
|
uint newblk;
|
|
__le32 *ref = (__le32 *)buf;
|
|
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
if ((ret = read_blk(sb, type, *blk, buf)) < 0) {
|
|
printk(KERN_ERR "VFS: Can't read quota data block %u\n", *blk);
|
|
goto out_buf;
|
|
}
|
|
newblk = le32_to_cpu(ref[GETIDINDEX(dquot->dq_id, depth)]);
|
|
if (depth == V2_DQTREEDEPTH-1) {
|
|
ret = free_dqentry(dquot, newblk);
|
|
newblk = 0;
|
|
}
|
|
else
|
|
ret = remove_tree(dquot, &newblk, depth+1);
|
|
if (ret >= 0 && !newblk) {
|
|
int i;
|
|
ref[GETIDINDEX(dquot->dq_id, depth)] = cpu_to_le32(0);
|
|
for (i = 0; i < V2_DQBLKSIZE && !buf[i]; i++); /* Block got empty? */
|
|
/* Don't put the root block into the free block list */
|
|
if (i == V2_DQBLKSIZE && *blk != V2_DQTREEOFF) {
|
|
put_free_dqblk(sb, type, buf, *blk);
|
|
*blk = 0;
|
|
}
|
|
else
|
|
if ((ret = write_blk(sb, type, *blk, buf)) < 0)
|
|
printk(KERN_ERR "VFS: Can't write quota tree "
|
|
"block %u.\n", *blk);
|
|
}
|
|
out_buf:
|
|
freedqbuf(buf);
|
|
return ret;
|
|
}
|
|
|
|
/* Delete dquot from tree */
|
|
static int v2_delete_dquot(struct dquot *dquot)
|
|
{
|
|
uint tmp = V2_DQTREEOFF;
|
|
|
|
if (!dquot->dq_off) /* Even not allocated? */
|
|
return 0;
|
|
return remove_tree(dquot, &tmp, 0);
|
|
}
|
|
|
|
/* Find entry in block */
|
|
static loff_t find_block_dqentry(struct dquot *dquot, uint blk)
|
|
{
|
|
dqbuf_t buf = getdqbuf();
|
|
loff_t ret = 0;
|
|
int i;
|
|
struct v2_disk_dqblk *ddquot = GETENTRIES(buf);
|
|
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
if ((ret = read_blk(dquot->dq_sb, dquot->dq_type, blk, buf)) < 0) {
|
|
printk(KERN_ERR "VFS: Can't read quota tree block %u.\n", blk);
|
|
goto out_buf;
|
|
}
|
|
if (dquot->dq_id)
|
|
for (i = 0; i < V2_DQSTRINBLK &&
|
|
le32_to_cpu(ddquot[i].dqb_id) != dquot->dq_id; i++);
|
|
else { /* ID 0 as a bit more complicated searching... */
|
|
struct v2_disk_dqblk fakedquot;
|
|
|
|
memset(&fakedquot, 0, sizeof(struct v2_disk_dqblk));
|
|
for (i = 0; i < V2_DQSTRINBLK; i++)
|
|
if (!le32_to_cpu(ddquot[i].dqb_id) &&
|
|
memcmp(&fakedquot, ddquot+i, sizeof(struct v2_disk_dqblk)))
|
|
break;
|
|
}
|
|
if (i == V2_DQSTRINBLK) {
|
|
printk(KERN_ERR "VFS: Quota for id %u referenced "
|
|
"but not present.\n", dquot->dq_id);
|
|
ret = -EIO;
|
|
goto out_buf;
|
|
}
|
|
else
|
|
ret = (blk << V2_DQBLKSIZE_BITS) + sizeof(struct
|
|
v2_disk_dqdbheader) + i * sizeof(struct v2_disk_dqblk);
|
|
out_buf:
|
|
freedqbuf(buf);
|
|
return ret;
|
|
}
|
|
|
|
/* Find entry for given id in the tree */
|
|
static loff_t find_tree_dqentry(struct dquot *dquot, uint blk, int depth)
|
|
{
|
|
dqbuf_t buf = getdqbuf();
|
|
loff_t ret = 0;
|
|
__le32 *ref = (__le32 *)buf;
|
|
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
if ((ret = read_blk(dquot->dq_sb, dquot->dq_type, blk, buf)) < 0) {
|
|
printk(KERN_ERR "VFS: Can't read quota tree block %u.\n", blk);
|
|
goto out_buf;
|
|
}
|
|
ret = 0;
|
|
blk = le32_to_cpu(ref[GETIDINDEX(dquot->dq_id, depth)]);
|
|
if (!blk) /* No reference? */
|
|
goto out_buf;
|
|
if (depth < V2_DQTREEDEPTH-1)
|
|
ret = find_tree_dqentry(dquot, blk, depth+1);
|
|
else
|
|
ret = find_block_dqentry(dquot, blk);
|
|
out_buf:
|
|
freedqbuf(buf);
|
|
return ret;
|
|
}
|
|
|
|
/* Find entry for given id in the tree - wrapper function */
|
|
static inline loff_t find_dqentry(struct dquot *dquot)
|
|
{
|
|
return find_tree_dqentry(dquot, V2_DQTREEOFF, 0);
|
|
}
|
|
|
|
static int v2_read_dquot(struct dquot *dquot)
|
|
{
|
|
int type = dquot->dq_type;
|
|
loff_t offset;
|
|
struct v2_disk_dqblk ddquot, empty;
|
|
int ret = 0;
|
|
|
|
#ifdef __QUOTA_V2_PARANOIA
|
|
/* Invalidated quota? */
|
|
if (!dquot->dq_sb || !sb_dqopt(dquot->dq_sb)->files[type]) {
|
|
printk(KERN_ERR "VFS: Quota invalidated while reading!\n");
|
|
return -EIO;
|
|
}
|
|
#endif
|
|
offset = find_dqentry(dquot);
|
|
if (offset <= 0) { /* Entry not present? */
|
|
if (offset < 0)
|
|
printk(KERN_ERR "VFS: Can't read quota "
|
|
"structure for id %u.\n", dquot->dq_id);
|
|
dquot->dq_off = 0;
|
|
set_bit(DQ_FAKE_B, &dquot->dq_flags);
|
|
memset(&dquot->dq_dqb, 0, sizeof(struct mem_dqblk));
|
|
ret = offset;
|
|
}
|
|
else {
|
|
dquot->dq_off = offset;
|
|
if ((ret = dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type,
|
|
(char *)&ddquot, sizeof(struct v2_disk_dqblk), offset))
|
|
!= sizeof(struct v2_disk_dqblk)) {
|
|
if (ret >= 0)
|
|
ret = -EIO;
|
|
printk(KERN_ERR "VFS: Error while reading quota "
|
|
"structure for id %u.\n", dquot->dq_id);
|
|
memset(&ddquot, 0, sizeof(struct v2_disk_dqblk));
|
|
}
|
|
else {
|
|
ret = 0;
|
|
/* We need to escape back all-zero structure */
|
|
memset(&empty, 0, sizeof(struct v2_disk_dqblk));
|
|
empty.dqb_itime = cpu_to_le64(1);
|
|
if (!memcmp(&empty, &ddquot, sizeof(struct v2_disk_dqblk)))
|
|
ddquot.dqb_itime = 0;
|
|
}
|
|
disk2memdqb(&dquot->dq_dqb, &ddquot);
|
|
if (!dquot->dq_dqb.dqb_bhardlimit &&
|
|
!dquot->dq_dqb.dqb_bsoftlimit &&
|
|
!dquot->dq_dqb.dqb_ihardlimit &&
|
|
!dquot->dq_dqb.dqb_isoftlimit)
|
|
set_bit(DQ_FAKE_B, &dquot->dq_flags);
|
|
}
|
|
dqstats.reads++;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Check whether dquot should not be deleted. We know we are
|
|
* the only one operating on dquot (thanks to dq_lock) */
|
|
static int v2_release_dquot(struct dquot *dquot)
|
|
{
|
|
if (test_bit(DQ_FAKE_B, &dquot->dq_flags) && !(dquot->dq_dqb.dqb_curinodes | dquot->dq_dqb.dqb_curspace))
|
|
return v2_delete_dquot(dquot);
|
|
return 0;
|
|
}
|
|
|
|
static struct quota_format_ops v2_format_ops = {
|
|
.check_quota_file = v2_check_quota_file,
|
|
.read_file_info = v2_read_file_info,
|
|
.write_file_info = v2_write_file_info,
|
|
.free_file_info = NULL,
|
|
.read_dqblk = v2_read_dquot,
|
|
.commit_dqblk = v2_write_dquot,
|
|
.release_dqblk = v2_release_dquot,
|
|
};
|
|
|
|
static struct quota_format_type v2_quota_format = {
|
|
.qf_fmt_id = QFMT_VFS_V0,
|
|
.qf_ops = &v2_format_ops,
|
|
.qf_owner = THIS_MODULE
|
|
};
|
|
|
|
static int __init init_v2_quota_format(void)
|
|
{
|
|
return register_quota_format(&v2_quota_format);
|
|
}
|
|
|
|
static void __exit exit_v2_quota_format(void)
|
|
{
|
|
unregister_quota_format(&v2_quota_format);
|
|
}
|
|
|
|
module_init(init_v2_quota_format);
|
|
module_exit(exit_v2_quota_format);
|