2.6.5-quotafix.patch

非常经典的一个分布式系统

 	dqopt->files[type] = NULL;
+	iput(inode);
 out_lock:
 	up(&dqopt->dqonoff_sem);
-out_f:
-	filp_close(f, NULL);
+	if (oldflags != -1) {
+		down_write(&dqopt->dqptr_sem);
+		/* Set the flags back (in the case of accidental quotaon()
+		 * on a wrong file we don't want to mess up the flags) */
+		inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
+		inode->i_flags |= oldflags;
+		up_write(&dqopt->dqptr_sem);
+	}
+	up(&inode->i_sem);
 out_fmt:
 	put_quota_format(fmt);
 
 	return error; 
 }
 
+/* Actual function called from quotactl() */
+int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path)
+{
+	struct nameidata nd;
+	int error;
+
+	error = path_lookup(path, LOOKUP_FOLLOW, &nd);
+	if (error < 0)
+		return error;
+	error = security_quota_on(nd.dentry);
+	if (error)
+		goto out_path;
+	/* Quota file not on the same filesystem? */
+	if (nd.mnt->mnt_sb != sb)
+		error = -EXDEV;
+	else {
+		error = vfs_quota_on_inode(nd.dentry->d_inode, type, format_id);
+		if (!error)
+			sb_dqopt(sb)->mnt[type] = mntget(nd.mnt);
+	}
+
+out_path:
+	path_release(&nd);
+	return error;
+}
+
 /* Generic routine for getting common part of quota structure */
 static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
 {
@@ -1430,8 +1600,10 @@ int vfs_set_dqinfo(struct super_block *s
 		mi->dqi_igrace = ii->dqi_igrace;
 	if (ii->dqi_valid & IIF_FLAGS)
 		mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | (ii->dqi_flags & DQF_MASK);
-	mark_info_dirty(mi);
 	spin_unlock(&dq_data_lock);
+	mark_info_dirty(sb, type);
+	/* Force write to disk */
+	sb->dq_op->write_info(sb, type);
 	up(&sb_dqopt(sb)->dqonoff_sem);
 	return 0;
 }
@@ -1564,3 +1736,15 @@ EXPORT_SYMBOL(dqstats);
 EXPORT_SYMBOL(dq_list_lock);
 EXPORT_SYMBOL(dq_data_lock);
 EXPORT_SYMBOL(init_dquot_operations);
+EXPORT_SYMBOL(dquot_commit);
+EXPORT_SYMBOL(dquot_commit_info);
+EXPORT_SYMBOL(dquot_acquire);
+EXPORT_SYMBOL(dquot_release);
+EXPORT_SYMBOL(dquot_initialize);
+EXPORT_SYMBOL(dquot_drop);
+EXPORT_SYMBOL(dquot_alloc_space);
+EXPORT_SYMBOL(dquot_alloc_inode);
+EXPORT_SYMBOL(dquot_free_space);
+EXPORT_SYMBOL(dquot_free_inode);
+EXPORT_SYMBOL(dquot_transfer);
+
Index: linux-2.6.5-7.283/fs/quota_v2.c
===================================================================
--- linux-2.6.5-7.283.orig/fs/quota_v2.c
+++ linux-2.6.5-7.283/fs/quota_v2.c
@@ -13,7 +13,6 @@
 #include <linux/slab.h>
 
 #include <asm/byteorder.h>
-#include <asm/uaccess.h>
 
 MODULE_AUTHOR("Jan Kara");
 MODULE_DESCRIPTION("Quota format v2 support");
@@ -30,19 +29,15 @@ typedef char *dqbuf_t;
 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))
+	size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);
+	if (size != sizeof(struct v2_disk_dqheader)) {
+		printk("failed read\n");
 		return 0;
+	}
 	if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] ||
 	    le32_to_cpu(dqhead.dqh_version) != quota_versions[type])
 		return 0;
@@ -52,20 +47,15 @@ static int v2_check_quota_file(struct su
 /* 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);
+	size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
+			sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
 	if (size != sizeof(struct v2_disk_dqinfo)) {
 		printk(KERN_WARNING "Can't read info structure on device %s.\n",
-			f->f_vfsmnt->mnt_sb->s_id);
+			sb->s_id);
 		return -1;
 	}
 	info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
@@ -80,12 +70,9 @@ static int v2_read_file_info(struct supe
 /* 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);
@@ -94,13 +81,13 @@ static int v2_write_file_info(struct sup
 	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);
+	
+	size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
+			sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
+
 	if (size != sizeof(struct v2_disk_dqinfo)) {
 		printk(KERN_WARNING "Can't write info structure on device %s.\n",
-			f->f_vfsmnt->mnt_sb->s_id);
+			sb->s_id);
 		return -1;
 	}
 	return 0;
@@ -144,38 +131,24 @@ static inline void freedqbuf(dqbuf_t buf
 	kfree(buf);
 }
 
-static ssize_t read_blk(struct file *filp, uint blk, dqbuf_t buf)
+static inline ssize_t read_blk(struct super_block *sb, int type, 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;
+	return sb->s_op->quota_read(sb, type, (char *)buf,
+			V2_DQBLKSIZE, blk << V2_DQBLKSIZE_BITS);
 }
 
-static ssize_t write_blk(struct file *filp, uint blk, dqbuf_t buf)
+static inline ssize_t write_blk(struct super_block *sb, int type, 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;
-
+	return sb->s_op->quota_write(sb, type, (char *)buf,
+			V2_DQBLKSIZE, blk << V2_DQBLKSIZE_BITS);
 }
 
 /* Remove empty block from list and return it */
-static int get_free_dqblk(struct file *filp, struct mem_dqinfo *info)
+static int get_free_dqblk(struct super_block *sb, int type)
 {
 	dqbuf_t buf = getdqbuf();
+	struct mem_dqinfo *info = sb_dqinfo(sb, type);
 	struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf;
 	int ret, blk;
 
@@ -183,17 +156,18 @@ static int get_free_dqblk(struct file *f
 		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)
+		if ((ret = read_blk(sb, type, 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... */
+		/* Assure block allocation... */
+		if ((ret = write_blk(sb, type, info->u.v2_i.dqi_blocks, buf)) < 0)
 			goto out_buf;
 		blk = info->u.v2_i.dqi_blocks++;
 	}
-	mark_info_dirty(info);
+	mark_info_dirty(sb, type);
 	ret = blk;
 out_buf:
 	freedqbuf(buf);
@@ -201,8 +175,9 @@ out_buf:
 }
 
 /* Insert empty block to the list */
-static int put_free_dqblk(struct file *filp, struct mem_dqinfo *info, dqbuf_t buf, uint blk)
+static int put_free_dqblk(struct super_block *sb, int type, dqbuf_t buf, uint blk)
 {
+	struct mem_dqinfo *info = sb_dqinfo(sb, type);
 	struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf;
 	int err;
 
@@ -210,16 +185,18 @@ static int put_free_dqblk(struct file *f
 	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... */
+	mark_info_dirty(sb, type);
+	/* Some strange block. We had better leave it... */
+	if ((err = write_blk(sb, type, blk, buf)) < 0)
 		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)
+static int remove_free_dqentry(struct super_block *sb, int type, dqbuf_t buf, uint blk)
 {
 	dqbuf_t tmpbuf = getdqbuf();
+	struct mem_dqinfo *info = sb_dqinfo(sb, type);
 	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;
@@ -227,26 +204,27 @@ static int remove_free_dqentry(struct fi
 	if (!tmpbuf)
 		return -ENOMEM;
 	if (nextblk) {
-		if ((err = read_blk(filp, nextblk, tmpbuf)) < 0)
+		if ((err = read_blk(sb, type, 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)
+		if ((err = write_blk(sb, type, nextblk, tmpbuf)) < 0)
 			goto out_buf;
 	}
 	if (prevblk) {
-		if ((err = read_blk(filp, prevblk, tmpbuf)) < 0)
+		if ((err = read_blk(sb, type, 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)
+		if ((err = write_blk(sb, type, prevblk, tmpbuf)) < 0)
 			goto out_buf;
 	}
 	else {
 		info->u.v2_i.dqi_free_entry = nextblk;
-		mark_info_dirty(info);
+		mark_info_dirty(sb, type);
 	}
 	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 */
+	/* No matter whether write succeeds block is out of list */
+	if (write_blk(sb, type, blk, buf) < 0)
 		printk(KERN_ERR "VFS: Can't write block (%u) with free entries.\n", blk);
 	return 0;
 out_buf:
@@ -255,9 +233,10 @@ out_buf:
 }
 
 /* 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)
+static int insert_free_dqentry(struct super_block *sb, int type, dqbuf_t buf, uint blk)
 {
 	dqbuf_t tmpbuf = getdqbuf();
+	struct mem_dqinfo *info = sb_dqinfo(sb, type);
 	struct v2_disk_dqdbheader *dh = (struct v2_disk_dqdbheader *)buf;
 	int err;
 
@@ -265,18 +244,18 @@ static int insert_free_dqentry(struct fi
 		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)
+	if ((err = write_blk(sb, type, 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)
+		if ((err = read_blk(sb, type, 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)
+		if ((err = write_blk(sb, type, 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);
+	mark_info_dirty(sb, type);
 	return 0;
 out_buf:
 	freedqbuf(tmpbuf);
@@ -286,8 +265,8 @@ out_buf:
 /* 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;
+	struct super_block *sb = dquot->dq_sb;
+	struct mem_dqinfo *info = sb_dqopt(sb)->info+dquot->dq_type;
 	uint blk, i;
 	struct v2_disk_dqdbheader *dh;
 	struct v2_disk_dqblk *ddquot;
@@ -303,22 +282,23 @@ static uint find_free_dqentry(struct dqu
 	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)
+		if ((*err = read_blk(sb, dquot->dq_type, blk, buf)) < 0)
 			goto out_buf;
 	}
 	else {
-		blk = get_free_dqblk(filp, info);
+		blk = get_free_dqblk(sb, dquot->dq_type);
 		if ((int)blk < 0) {
 			*err = blk;
 			freedqbuf(buf);
 			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);
+		/* This is enough as block is already zeroed and entry list is empty... */
+		info->u.v2_i.dqi_free_entry = blk;
+		mark_info_dirty(sb, dquot->dq_type);
 	}
 	if (le16_to_cpu(dh->dqdh_entries)+1 >= V2_DQSTRINBLK)	/* Block will be full? */
-		if ((*err = remove_free_dqentry(filp, info, buf, blk)) < 0) {
+		if ((*err = remove_free_dqentry(sb, dquot->dq_type, buf, blk)) < 0) {
 			printk(KERN_ERR "VFS: find_free_dqentry(): Can't remove block (%u) from entry free list.\n", blk);
 			goto out_buf;
 		}
@@ -333,7 +313,7 @@ static uint find_free_dqentry(struct dqu
 		goto out_buf;
 	}
 #endif
-	if ((*err = write_blk(filp, blk, buf)) < 0) {
+	if ((*err = write_blk(sb, dquot->dq_type, blk, buf)) < 0) {
 		printk(KERN_ERR "VFS: find_free_dqentry(): Can't write quota data block %u.\n", blk);
 		goto out_buf;
 	}
@@ -348,8 +328,7 @@ out_buf:
 /* 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;
+	struct super_block *sb = dquot->dq_sb;
 	dqbuf_t buf;