--- /dev/null
+/*
+ * vfsv0 quota IO operations on file
+ */
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/dqblk_v2.h>
+#include <linux/quotaio_v2.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include <asm/byteorder.h>
+#include <asm/uaccess.h>
+
+#define __QUOTA_V2_PARANOIA
+
+typedef char *dqbuf_t;
+
+#define GETIDINDEX(id, depth) (((id) >> ((V2_DQTREEDEPTH-(depth)-1)*8)) & 0xff)
+#define GETENTRIES(buf) ((struct v2_disk_dqblk *)(((char *)buf)+sizeof(struct v2_disk_dqdbheader)))
+
+/* Check whether given file is really vfsv0 quotafile */
+static int v2_check_quota_file(struct super_block *sb, int type)
+{
+ struct v2_disk_dqheader dqhead;
+ struct file *f = sb_dqopt(sb)->files[type];
+ mm_segment_t fs;
+ ssize_t size;
+ loff_t offset = 0;
+ static const uint quota_magics[] = V2_INITQMAGICS;
+ static const uint quota_versions[] = V2_INITQVERSIONS;
+
+ fs = get_fs();
+ set_fs(KERNEL_DS);
+ size = f->f_op->read(f, (char *)&dqhead, sizeof(struct v2_disk_dqheader), &offset);
+ set_fs(fs);
+ if (size != sizeof(struct v2_disk_dqheader))
+ return 0;
+ if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] ||
+ le32_to_cpu(dqhead.dqh_version) != quota_versions[type])
+ return 0;
+ return 1;
+}
+
+/* Read information header from quota file */
+static int v2_read_file_info(struct super_block *sb, int type)
+{
+ mm_segment_t fs;
+ struct v2_disk_dqinfo dinfo;
+ struct mem_dqinfo *info = sb_dqopt(sb)->info+type;
+ struct file *f = sb_dqopt(sb)->files[type];
+ ssize_t size;
+ loff_t offset = V2_DQINFOOFF;
+
+ fs = get_fs();
+ set_fs(KERNEL_DS);
+ size = f->f_op->read(f, (char *)&dinfo, sizeof(struct v2_disk_dqinfo), &offset);
+ set_fs(fs);
+ if (size != sizeof(struct v2_disk_dqinfo)) {
+ printk(KERN_WARNING "Can't read info structure on device %s.\n",
+ kdevname(f->f_dentry->d_sb->s_dev));
+ return -1;
+ }
+ info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
+ info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
+ info->dqi_flags = le32_to_cpu(dinfo.dqi_flags);
+ info->u.v2_i.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
+ info->u.v2_i.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
+ info->u.v2_i.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
+ return 0;
+}
+
+/* Write information header to quota file */
+static int v2_write_file_info(struct super_block *sb, int type)
+{
+ mm_segment_t fs;
+ struct v2_disk_dqinfo dinfo;
+ struct mem_dqinfo *info = sb_dqopt(sb)->info+type;
+ struct file *f = sb_dqopt(sb)->files[type];
+ ssize_t size;
+ loff_t offset = V2_DQINFOOFF;
+
+ info->dqi_flags &= ~DQF_INFO_DIRTY;
+ dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
+ dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
+ dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
+ dinfo.dqi_blocks = cpu_to_le32(info->u.v2_i.dqi_blocks);
+ dinfo.dqi_free_blk = cpu_to_le32(info->u.v2_i.dqi_free_blk);
+ dinfo.dqi_free_entry = cpu_to_le32(info->u.v2_i.dqi_free_entry);
+ fs = get_fs();
+ set_fs(KERNEL_DS);
+ size = f->f_op->write(f, (char *)&dinfo, sizeof(struct v2_disk_dqinfo), &offset);
+ set_fs(fs);
+ if (size != sizeof(struct v2_disk_dqinfo)) {
+ printk(KERN_WARNING "Can't write info structure on device %s.\n",
+ kdevname(f->f_dentry->d_sb->s_dev));
+ return -1;
+ }
+ return 0;
+}
+
+static void disk2memdqb(struct mem_dqblk *m, struct v2_disk_dqblk *d)
+{
+ m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
+ m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
+ m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
+ m->dqb_itime = le64_to_cpu(d->dqb_itime);
+ m->dqb_bhardlimit = le32_to_cpu(d->dqb_bhardlimit);
+ m->dqb_bsoftlimit = le32_to_cpu(d->dqb_bsoftlimit);
+ m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
+ m->dqb_btime = le64_to_cpu(d->dqb_btime);
+}
+
+static void mem2diskdqb(struct v2_disk_dqblk *d, struct mem_dqblk *m, qid_t id)
+{
+ d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
+ d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
+ d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
+ d->dqb_itime = cpu_to_le64(m->dqb_itime);
+ d->dqb_bhardlimit = cpu_to_le32(m->dqb_bhardlimit);
+ d->dqb_bsoftlimit = cpu_to_le32(m->dqb_bsoftlimit);
+ d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
+ d->dqb_btime = cpu_to_le64(m->dqb_btime);
+ d->dqb_id = cpu_to_le32(id);
+}
+
+static dqbuf_t getdqbuf(void)
+{
+ dqbuf_t buf = kmalloc(V2_DQBLKSIZE, GFP_KERNEL);
+ if (!buf)
+ printk(KERN_WARNING "VFS: Not enough memory for quota buffers.\n");
+ return buf;
+}
+
+static inline void freedqbuf(dqbuf_t buf)
+{
+ kfree(buf);
+}
+
+static ssize_t read_blk(struct file *filp, uint blk, dqbuf_t buf)
+{
+ mm_segment_t fs;
+ ssize_t ret;
+ loff_t offset = blk<<V2_DQBLKSIZE_BITS;
+
+ memset(buf, 0, V2_DQBLKSIZE);
+ fs = get_fs();
+ set_fs(KERNEL_DS);
+ ret = filp->f_op->read(filp, (char *)buf, V2_DQBLKSIZE, &offset);
+ set_fs(fs);
+ return ret;
+}
+
+static ssize_t write_blk(struct file *filp, uint blk, dqbuf_t buf)
+{
+ mm_segment_t fs;
+ ssize_t ret;
+ loff_t offset = blk<<V2_DQBLKSIZE_BITS;
+
+ fs = get_fs();
+ set_fs(KERNEL_DS);
+ ret = filp->f_op->write(filp, (char *)buf, V2_DQBLKSIZE, &offset);
+ set_fs(fs);
+ return ret;
+
+}
+
+/* Remove empty block from list and return it */
+static int get_free_dqblk(struct file *filp, struct mem_dqinfo *info)
+{
+ dqbuf_t buf = getdqbuf();
+ struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf;
+ int ret, blk;
+
+ if (!buf)
+ return -ENOMEM;
+ if (info->u.v2_i.dqi_free_blk) {
+ blk = info->u.v2_i.dqi_free_blk;
+ if ((ret = read_blk(filp, blk, buf)) < 0)
+ goto out_buf;
+ info->u.v2_i.dqi_free_blk = le32_to_cpu(dh->dqdh_next_free);
+ }
+ else {
+ memset(buf, 0, V2_DQBLKSIZE);
+ if ((ret = write_blk(filp, info->u.v2_i.dqi_blocks, buf)) < 0) /* Assure block allocation... */
+ goto out_buf;
+ blk = info->u.v2_i.dqi_blocks++;
+ }
+ mark_info_dirty(info);
+ ret = blk;
+out_buf:
+ freedqbuf(buf);
+ return ret;
+}
+
+/* Insert empty block to the list */
+static int put_free_dqblk(struct file *filp, struct mem_dqinfo *info, dqbuf_t buf, uint blk)
+{
+ struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf;
+ int err;
+
+ dh->dqdh_next_free = cpu_to_le32(info->u.v2_i.dqi_free_blk);
+ dh->dqdh_prev_free = cpu_to_le32(0);
+ dh->dqdh_entries = cpu_to_le16(0);
+ info->u.v2_i.dqi_free_blk = blk;
+ mark_info_dirty(info);
+ if ((err = write_blk(filp, blk, buf)) < 0) /* Some strange block. We had better leave it... */
+ return err;
+ return 0;
+}
+
+/* Remove given block from the list of blocks with free entries */
+static int remove_free_dqentry(struct file *filp, struct mem_dqinfo *info, dqbuf_t buf, uint blk)
+{
+ dqbuf_t tmpbuf = getdqbuf();
+ struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf;
+ uint nextblk = le32_to_cpu(dh->dqdh_next_free), prevblk = le32_to_cpu(dh->dqdh_prev_free);
+ int err;
+
+ if (!tmpbuf)
+ return -ENOMEM;
+ if (nextblk) {
+ if ((err = read_blk(filp, nextblk, tmpbuf)) < 0)
+ goto out_buf;
+ ((struct v2_disk_dqdbheader *)tmpbuf)->dqdh_prev_free = dh->dqdh_prev_free;
+ if ((err = write_blk(filp, nextblk, tmpbuf)) < 0)
+ goto out_buf;
+ }
+ if (prevblk) {
+ if ((err = read_blk(filp, prevblk, tmpbuf)) < 0)
+ goto out_buf;
+ ((struct v2_disk_dqdbheader *)tmpbuf)->dqdh_next_free = dh->dqdh_next_free;
+ if ((err = write_blk(filp, prevblk, tmpbuf)) < 0)
+ goto out_buf;
+ }
+ else {
+ info->u.v2_i.dqi_free_entry = nextblk;
+ mark_info_dirty(info);
+ }
+ freedqbuf(tmpbuf);
+ dh->dqdh_next_free = dh->dqdh_prev_free = cpu_to_le32(0);
+ if (write_blk(filp, blk, buf) < 0) /* No matter whether write succeeds block is out of list */
+ printk(KERN_ERR "VFS: Can't write block (%u) with free entries.\n", blk);
+ return 0;
+out_buf:
+ freedqbuf(tmpbuf);
+ return err;
+}
+
+/* Insert given block to the beginning of list with free entries */
+static int insert_free_dqentry(struct file *filp, struct mem_dqinfo *info, dqbuf_t buf, uint blk)
+{
+ dqbuf_t tmpbuf = getdqbuf();
+ struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf;
+ int err;
+
+ if (!tmpbuf)
+ return -ENOMEM;
+ dh->dqdh_next_free = cpu_to_le32(info->u.v2_i.dqi_free_entry);
+ dh->dqdh_prev_free = cpu_to_le32(0);
+ if ((err = write_blk(filp, blk, buf)) < 0)
+ goto out_buf;
+ if (info->u.v2_i.dqi_free_entry) {
+ if ((err = read_blk(filp, info->u.v2_i.dqi_free_entry, tmpbuf)) < 0)
+ goto out_buf;
+ ((struct v2_disk_dqdbheader *)tmpbuf)->dqdh_prev_free = cpu_to_le32(blk);
+ if ((err = write_blk(filp, info->u.v2_i.dqi_free_entry, tmpbuf)) < 0)
+ goto out_buf;
+ }
+ freedqbuf(tmpbuf);
+ info->u.v2_i.dqi_free_entry = blk;
+ mark_info_dirty(info);
+ return 0;
+out_buf:
+ freedqbuf(tmpbuf);
+ return err;
+}
+
+/* Find space for dquot */
+static uint find_free_dqentry(struct dquot *dquot, int *err)
+{
+ struct file *filp = sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
+ struct mem_dqinfo *info = sb_dqopt(dquot->dq_sb)->info+dquot->dq_type;
+ uint blk, i;
+ struct v2_disk_dqdbheader *dh;
+ struct v2_disk_dqblk *ddquot;
+ struct v2_disk_dqblk fakedquot;
+ dqbuf_t buf;
+
+ *err = 0;
+ if (!(buf = getdqbuf())) {
+ *err = -ENOMEM;
+ return 0;
+ }
+ dh = (struct v2_disk_dqdbheader *)buf;
+ ddquot = GETENTRIES(buf);
+ if (info->u.v2_i.dqi_free_entry) {
+ blk = info->u.v2_i.dqi_free_entry;
+ if ((*err = read_blk(filp, blk, buf)) < 0)
+ goto out_buf;
+ }
+ else {
+ blk = get_free_dqblk(filp, info);
+ if ((int)blk < 0) {
+ *err = blk;
+ return 0;
+ }
+ memset(buf, 0, V2_DQBLKSIZE);
+ info->u.v2_i.dqi_free_entry = blk; /* This is enough as block is already zeroed and entry list is empty... */
+ mark_info_dirty(info);
+ }
+ if (le16_to_cpu(dh->dqdh_entries)+1 >= V2_DQSTRINBLK) /* Block will be full? */
+ if ((*err = remove_free_dqentry(filp, info, buf, blk)) < 0) {
+ printk(KERN_ERR "VFS: find_free_dqentry(): Can't remove block (%u) from entry free list.\n", blk);
+ goto out_buf;
+ }
+ dh->dqdh_entries = cpu_to_le16(le16_to_cpu(dh->dqdh_entries)+1);
+ memset(&fakedquot, 0, sizeof(struct v2_disk_dqblk));
+ /* Find free structure in block */
+ for (i = 0; i < V2_DQSTRINBLK && memcmp(&fakedquot, ddquot+i, sizeof(struct v2_disk_dqblk)); i++);
+#ifdef __QUOTA_V2_PARANOIA
+ if (i == V2_DQSTRINBLK) {
+ printk(KERN_ERR "VFS: find_free_dqentry(): Data block full but it shouldn't.\n");
+ *err = -EIO;
+ goto out_buf;
+ }
+#endif
+ if ((*err = write_blk(filp, blk, buf)) < 0) {
+ printk(KERN_ERR "VFS: find_free_dqentry(): Can't write quota data block %u.\n", blk);
+ goto out_buf;
+ }
+ dquot->dq_off = (blk<<V2_DQBLKSIZE_BITS)+sizeof(struct v2_disk_dqdbheader)+i*sizeof(struct v2_disk_dqblk);
+ freedqbuf(buf);
+ return blk;
+out_buf:
+ freedqbuf(buf);
+ return 0;
+}
+
+/* Insert reference to structure into the trie */
+static int do_insert_tree(struct dquot *dquot, uint *treeblk, int depth)
+{
+ struct file *filp = sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
+ struct mem_dqinfo *info = sb_dqopt(dquot->dq_sb)->info + dquot->dq_type;
+ dqbuf_t buf;
+ int ret = 0, newson = 0, newact = 0;
+ u32 *ref;
+ uint newblk;
+
+ if (!(buf = getdqbuf()))
+ return -ENOMEM;
+ if (!*treeblk) {
+ ret = get_free_dqblk(filp, info);
+ if (ret < 0)
+ goto out_buf;
+ *treeblk = ret;
+ memset(buf, 0, V2_DQBLKSIZE);
+ newact = 1;
+ }
+ else {
+ if ((ret = read_blk(filp, *treeblk, buf)) < 0) {
+ printk(KERN_ERR "VFS: Can't read tree quota block %u.\n", *treeblk);
+ goto out_buf;
+ }
+ }
+ ref = (u32 *)buf;
+ newblk = le32_to_cpu(ref[GETIDINDEX(dquot->dq_id, depth)]);
+ if (!newblk)
+ newson = 1;
+ if (depth == V2_DQTREEDEPTH-1) {
+#ifdef __QUOTA_V2_PARANOIA
+ if (newblk) {
+ printk(KERN_ERR "VFS: Inserting already present quota entry (block %u).\n", ref[GETIDINDEX(dquot->dq_id, depth)]);
+ ret = -EIO;
+ goto out_buf;
+ }
+#endif
+ newblk = find_free_dqentry(dquot, &ret);
+ }
+ else
+ ret = do_insert_tree(dquot, &newblk, depth+1);
+ if (newson && ret >= 0) {
+ ref[GETIDINDEX(dquot->dq_id, depth)] = cpu_to_le32(newblk);
+ ret = write_blk(filp, *treeblk, buf);
+ }
+ else if (newact && ret < 0)
+ put_free_dqblk(filp, info, buf, *treeblk);
+out_buf:
+ freedqbuf(buf);
+ return ret;
+}
+
+/* Wrapper for inserting quota structure into tree */
+static inline int dq_insert_tree(struct dquot *dquot)
+{
+ int tmp = V2_DQTREEOFF;
+ return do_insert_tree(dquot, &tmp, 0);
+}
+
+/*
+ * We don't have to be afraid of deadlocks as we never have quotas on quota files...
+ */
+static int v2_write_dquot(struct dquot *dquot)
+{
+ int type = dquot->dq_type;
+ struct file *filp;
+ mm_segment_t fs;
+ loff_t offset;
+ ssize_t ret;
+ struct v2_disk_dqblk ddquot;
+
+ if (!dquot->dq_off)
+ if ((ret = dq_insert_tree(dquot)) < 0) {
+ printk(KERN_ERR "VFS: Error %d occured while creating quota.\n", ret);
+ return ret;
+ }
+ filp = sb_dqopt(dquot->dq_sb)->files[type];
+ offset = dquot->dq_off;
+ mem2diskdqb(&ddquot, &dquot->dq_dqb, dquot->dq_id);
+ fs = get_fs();
+ set_fs(KERNEL_DS);
+ ret = filp->f_op->write(filp, (char *)&ddquot, sizeof(struct v2_disk_dqblk), &offset);
+ set_fs(fs);
+ if (ret != sizeof(struct v2_disk_dqblk)) {
+ printk(KERN_WARNING "VFS: dquota write failed on dev %s\n", kdevname(dquot->dq_sb->s_dev));
+ 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 file *filp = sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
+ struct mem_dqinfo *info = sb_dqopt(dquot->dq_sb)->info + 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(filp, 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(filp, info, buf, blk)) < 0 ||
+ (ret = put_free_dqblk(filp, info, 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(filp, info, 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(filp, 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 file *filp = sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
+ struct mem_dqinfo *info = sb_dqopt(dquot->dq_sb)->info + dquot->dq_type;
+ dqbuf_t buf = getdqbuf();
+ int ret = 0;
+ uint newblk;
+ u32 *ref = (u32 *)buf;
+
+ if (!buf)
+ return -ENOMEM;
+ if ((ret = read_blk(filp, *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? */
+ if (i == V2_DQBLKSIZE) {
+ put_free_dqblk(filp, info, buf, *blk);
+ *blk = 0;
+ }
+ else
+ if ((ret = write_blk(filp, *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)
+{
+ struct file *filp = sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
+ 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(filp, 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)
+{
+ struct file *filp = sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
+ dqbuf_t buf = getdqbuf();
+ loff_t ret = 0;
+ u32 *ref = (u32 *)buf;
+
+ if (!buf)
+ return -ENOMEM;
+ if ((ret = read_blk(filp, 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;
+ struct file *filp;
+ mm_segment_t fs;
+ loff_t offset;
+ struct v2_disk_dqblk ddquot;
+ int ret = 0;
+
+ filp = sb_dqopt(dquot->dq_sb)->files[type];
+
+#ifdef __QUOTA_V2_PARANOIA
+ if (!filp || !dquot->dq_sb) { /* Invalidated quota? */
+ 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;
+ dquot->dq_flags |= DQ_FAKE;
+ memset(&dquot->dq_dqb, 0, sizeof(struct mem_dqblk));
+ ret = offset;
+ }
+ else {
+ dquot->dq_off = offset;
+ fs = get_fs();
+ set_fs(KERNEL_DS);
+ if ((ret = filp->f_op->read(filp, (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;
+ set_fs(fs);
+ disk2memdqb(&dquot->dq_dqb, &ddquot);
+ }
+ dqstats.reads++;
+ return ret;
+}
+
+/* Commit changes of dquot to disk - it might also mean deleting it when quota became fake one and user has no blocks... */
+static int v2_commit_dquot(struct dquot *dquot)
+{
+ /* We clear the flag everytime so we don't loop when there was an IO error... */
+ dquot->dq_flags &= ~DQ_MOD;
+ if (dquot->dq_flags & DQ_FAKE && !(dquot->dq_dqb.dqb_curinodes | dquot->dq_dqb.dqb_curspace))
+ return v2_delete_dquot(dquot);
+ else
+ return v2_write_dquot(dquot);
+}
+
+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_commit_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);
+}
+
+EXPORT_NO_SYMBOLS;
+
+module_init(init_v2_quota_format);
+module_exit(exit_v2_quota_format);
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