Release 4.10 fs/ocfs2/quota_local.c

/*
 *  Implementation of operations over local quota file
 */

#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/quota.h>
#include <linux/quotaops.h>
#include <linux/module.h>

#include <cluster/masklog.h>

#include "ocfs2_fs.h"
#include "ocfs2.h"
#include "inode.h"
#include "alloc.h"
#include "file.h"
#include "buffer_head_io.h"
#include "journal.h"
#include "sysfile.h"
#include "dlmglue.h"
#include "quota.h"
#include "uptodate.h"
#include "super.h"
#include "ocfs2_trace.h"

/* Number of local quota structures per block */


static inline unsigned int ol_quota_entries_per_block(struct super_block *sb)
{
	return ((sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) /
		sizeof(struct ocfs2_local_disk_dqblk));
}

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/* Number of blocks with entries in one chunk */


static inline unsigned int ol_chunk_blocks(struct super_block *sb)
{
	return ((sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
		 OCFS2_QBLK_RESERVED_SPACE) << 3) /
	       ol_quota_entries_per_block(sb);
}

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/* Number of entries in a chunk bitmap */


static unsigned int ol_chunk_entries(struct super_block *sb)
{
	return ol_chunk_blocks(sb) * ol_quota_entries_per_block(sb);
}

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/* Offset of the chunk in quota file */


static unsigned int ol_quota_chunk_block(struct super_block *sb, int c)
{
	/* 1 block for local quota file info, 1 block per chunk for chunk info */
	return 1 + (ol_chunk_blocks(sb) + 1) * c;
}

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static unsigned int ol_dqblk_block(struct super_block *sb, int c, int off)
{
	int epb = ol_quota_entries_per_block(sb);

	return ol_quota_chunk_block(sb, c) + 1 + off / epb;
}

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static unsigned int ol_dqblk_block_off(struct super_block *sb, int c, int off)
{
	int epb = ol_quota_entries_per_block(sb);

	return (off % epb) * sizeof(struct ocfs2_local_disk_dqblk);
}

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/* Offset of the dquot structure in the quota file */


static loff_t ol_dqblk_off(struct super_block *sb, int c, int off)
{
	return (ol_dqblk_block(sb, c, off) << sb->s_blocksize_bits) +
	       ol_dqblk_block_off(sb, c, off);
}

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static inline unsigned int ol_dqblk_block_offset(struct super_block *sb, loff_t off)
{
	return off & ((1 << sb->s_blocksize_bits) - 1);
}

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/* Compute offset in the chunk of a structure with the given offset */


static int ol_dqblk_chunk_off(struct super_block *sb, int c, loff_t off)
{
	int epb = ol_quota_entries_per_block(sb);

	return ((off >> sb->s_blocksize_bits) -
			ol_quota_chunk_block(sb, c) - 1) * epb
	       + ((unsigned int)(off & ((1 << sb->s_blocksize_bits) - 1))) /
		 sizeof(struct ocfs2_local_disk_dqblk);
}

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/* Write bufferhead into the fs */


static int ocfs2_modify_bh(struct inode *inode, struct buffer_head *bh,
		void (*modify)(struct buffer_head *, void *), void *private)
{
	struct super_block *sb = inode->i_sb;
	handle_t *handle;
	int status;

	handle = ocfs2_start_trans(OCFS2_SB(sb),
				   OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		mlog_errno(status);
		return status;
	}
	status = ocfs2_journal_access_dq(handle, INODE_CACHE(inode), bh,
					 OCFS2_JOURNAL_ACCESS_WRITE);
	if (status < 0) {
		mlog_errno(status);
		ocfs2_commit_trans(OCFS2_SB(sb), handle);
		return status;
	}
	lock_buffer(bh);
	modify(bh, private);
	unlock_buffer(bh);
	ocfs2_journal_dirty(handle, bh);

	status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
	if (status < 0) {
		mlog_errno(status);
		return status;
	}
	return 0;
}

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/*
 * Read quota block from a given logical offset.
 *
 * This function acquires ip_alloc_sem and thus it must not be called with a
 * transaction started.
 */


static int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
				  struct buffer_head **bh)
{
	int rc = 0;
	struct buffer_head *tmp = *bh;

	if (i_size_read(inode) >> inode->i_sb->s_blocksize_bits <= v_block) {
		ocfs2_error(inode->i_sb,
			    "Quota file %llu is probably corrupted! Requested to read block %Lu but file has size only %Lu\n",
			    (unsigned long long)OCFS2_I(inode)->ip_blkno,
			    (unsigned long long)v_block,
			    (unsigned long long)i_size_read(inode));
		return -EIO;
	}
	rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0,
				    ocfs2_validate_quota_block);
	if (rc)
		mlog_errno(rc);

	/* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
	if (!rc && !*bh)
		*bh = tmp;

	return rc;
}

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/* Check whether we understand format of quota files */


static int ocfs2_local_check_quota_file(struct super_block *sb, int type)
{
	unsigned int lmagics[OCFS2_MAXQUOTAS] = OCFS2_LOCAL_QMAGICS;
	unsigned int lversions[OCFS2_MAXQUOTAS] = OCFS2_LOCAL_QVERSIONS;
	unsigned int gmagics[OCFS2_MAXQUOTAS] = OCFS2_GLOBAL_QMAGICS;
	unsigned int gversions[OCFS2_MAXQUOTAS] = OCFS2_GLOBAL_QVERSIONS;
	unsigned int ino[OCFS2_MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
					      GROUP_QUOTA_SYSTEM_INODE };
	struct buffer_head *bh = NULL;
	struct inode *linode = sb_dqopt(sb)->files[type];
	struct inode *ginode = NULL;
	struct ocfs2_disk_dqheader *dqhead;
	int status, ret = 0;

	/* First check whether we understand local quota file */
	status = ocfs2_read_quota_block(linode, 0, &bh);
	if (status) {
		mlog_errno(status);
		mlog(ML_ERROR, "failed to read quota file header (type=%d)\n",
			type);
		goto out_err;
	}
	dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
	if (le32_to_cpu(dqhead->dqh_magic) != lmagics[type]) {
		mlog(ML_ERROR, "quota file magic does not match (%u != %u),"
			" type=%d\n", le32_to_cpu(dqhead->dqh_magic),
			lmagics[type], type);
		goto out_err;
	}
	if (le32_to_cpu(dqhead->dqh_version) != lversions[type]) {
		mlog(ML_ERROR, "quota file version does not match (%u != %u),"
			" type=%d\n", le32_to_cpu(dqhead->dqh_version),
			lversions[type], type);
		goto out_err;
	}
	brelse(bh);
	bh = NULL;

	/* Next check whether we understand global quota file */
	ginode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
						OCFS2_INVALID_SLOT);
	if (!ginode) {
		mlog(ML_ERROR, "cannot get global quota file inode "
				"(type=%d)\n", type);
		goto out_err;
	}
	/* Since the header is read only, we don't care about locking */
	status = ocfs2_read_quota_block(ginode, 0, &bh);
	if (status) {
		mlog_errno(status);
		mlog(ML_ERROR, "failed to read global quota file header "
				"(type=%d)\n", type);
		goto out_err;
	}
	dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
	if (le32_to_cpu(dqhead->dqh_magic) != gmagics[type]) {
		mlog(ML_ERROR, "global quota file magic does not match "
			"(%u != %u), type=%d\n",
			le32_to_cpu(dqhead->dqh_magic), gmagics[type], type);
		goto out_err;
	}
	if (le32_to_cpu(dqhead->dqh_version) != gversions[type]) {
		mlog(ML_ERROR, "global quota file version does not match "
			"(%u != %u), type=%d\n",
			le32_to_cpu(dqhead->dqh_version), gversions[type],
			type);
		goto out_err;
	}

	ret = 1;
out_err:
	brelse(bh);
	iput(ginode);
	return ret;
}

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/* Release given list of quota file chunks */


static void ocfs2_release_local_quota_bitmaps(struct list_head *head)
{
	struct ocfs2_quota_chunk *pos, *next;

	list_for_each_entry_safe(pos, next, head, qc_chunk) {
		list_del(&pos->qc_chunk);
		brelse(pos->qc_headerbh);
		kmem_cache_free(ocfs2_qf_chunk_cachep, pos);
	}
}

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/* Load quota bitmaps into memory */


static int ocfs2_load_local_quota_bitmaps(struct inode *inode,
			struct ocfs2_local_disk_dqinfo *ldinfo,
			struct list_head *head)
{
	struct ocfs2_quota_chunk *newchunk;
	int i, status;

	INIT_LIST_HEAD(head);
	for (i = 0; i < le32_to_cpu(ldinfo->dqi_chunks); i++) {
		newchunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
		if (!newchunk) {
			ocfs2_release_local_quota_bitmaps(head);
			return -ENOMEM;
		}
		newchunk->qc_num = i;
		newchunk->qc_headerbh = NULL;
		status = ocfs2_read_quota_block(inode,
				ol_quota_chunk_block(inode->i_sb, i),
				&newchunk->qc_headerbh);
		if (status) {
			mlog_errno(status);
			kmem_cache_free(ocfs2_qf_chunk_cachep, newchunk);
			ocfs2_release_local_quota_bitmaps(head);
			return status;
		}
		list_add_tail(&newchunk->qc_chunk, head);
	}
	return 0;
}

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static void olq_update_info(struct buffer_head *bh, void *private)
{
	struct mem_dqinfo *info = private;
	struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
	struct ocfs2_local_disk_dqinfo *ldinfo;

	ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
						OCFS2_LOCAL_INFO_OFF);
	spin_lock(&dq_data_lock);
	ldinfo->dqi_flags = cpu_to_le32(oinfo->dqi_flags);
	ldinfo->dqi_chunks = cpu_to_le32(oinfo->dqi_chunks);
	ldinfo->dqi_blocks = cpu_to_le32(oinfo->dqi_blocks);
	spin_unlock(&dq_data_lock);
}

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static int ocfs2_add_recovery_chunk(struct super_block *sb,
				    struct ocfs2_local_disk_chunk *dchunk,
				    int chunk,
				    struct list_head *head)
{
	struct ocfs2_recovery_chunk *rc;

	rc = kmalloc(sizeof(struct ocfs2_recovery_chunk), GFP_NOFS);
	if (!rc)
		return -ENOMEM;
	rc->rc_chunk = chunk;
	rc->rc_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
	if (!rc->rc_bitmap) {
		kfree(rc);
		return -ENOMEM;
	}
	memcpy(rc->rc_bitmap, dchunk->dqc_bitmap,
	       (ol_chunk_entries(sb) + 7) >> 3);
	list_add_tail(&rc->rc_list, head);
	return 0;
}

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static void free_recovery_list(struct list_head *head)
{
	struct ocfs2_recovery_chunk *next;
	struct ocfs2_recovery_chunk *rchunk;

	list_for_each_entry_safe(rchunk, next, head, rc_list) {
		list_del(&rchunk->rc_list);
		kfree(rchunk->rc_bitmap);
		kfree(rchunk);
	}
}

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void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec)
{
	int type;

	for (type = 0; type < OCFS2_MAXQUOTAS; type++)
		free_recovery_list(&(rec->r_list[type]));
	kfree(rec);
}

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/* Load entries in our quota file we have to recover*/


static int ocfs2_recovery_load_quota(struct inode *lqinode,
				     struct ocfs2_local_disk_dqinfo *ldinfo,
				     int type,
				     struct list_head *head)
{
	struct super_block *sb = lqinode->i_sb;
	struct buffer_head *hbh;
	struct ocfs2_local_disk_chunk *dchunk;
	int i, chunks = le32_to_cpu(ldinfo->dqi_chunks);
	int status = 0;

	for (i = 0; i < chunks; i++) {
		hbh = NULL;
		status = ocfs2_read_quota_block(lqinode,
						ol_quota_chunk_block(sb, i),
						&hbh);
		if (status) {
			mlog_errno(status);
			break;
		}
		dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
		if (le32_to_cpu(dchunk->dqc_free) < ol_chunk_entries(sb))
			status = ocfs2_add_recovery_chunk(sb, dchunk, i, head);
		brelse(hbh);
		if (status < 0)
			break;
	}
	if (status < 0)
		free_recovery_list(head);
	return status;
}

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static struct ocfs2_quota_recovery *ocfs2_alloc_quota_recovery(void)
{
	int type;
	struct ocfs2_quota_recovery *rec;

	rec = kmalloc(sizeof(struct ocfs2_quota_recovery), GFP_NOFS);
	if (!rec)
		return NULL;
	for (type = 0; type < OCFS2_MAXQUOTAS; type++)
		INIT_LIST_HEAD(&(rec->r_list[type]));
	return rec;
}

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/* Load information we need for quota recovery into memory */


struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
						struct ocfs2_super *osb,
						int slot_num)
{
	unsigned int feature[OCFS2_MAXQUOTAS] = {
					OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
					OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
	unsigned int ino[OCFS2_MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
					      LOCAL_GROUP_QUOTA_SYSTEM_INODE };
	struct super_block *sb = osb->sb;
	struct ocfs2_local_disk_dqinfo *ldinfo;
	struct inode *lqinode;
	struct buffer_head *bh;
	int type;
	int status = 0;
	struct ocfs2_quota_recovery *rec;

	printk(KERN_NOTICE "ocfs2: Beginning quota recovery on device (%s) for "
	       "slot %u\n", osb->dev_str, slot_num);

	rec = ocfs2_alloc_quota_recovery();
	if (!rec)
		return ERR_PTR(-ENOMEM);
	/* First init... */

	for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
		if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
			continue;
		/* At this point, journal of the slot is already replayed so
                 * we can trust metadata and data of the quota file */
		lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
		if (!lqinode) {
			status = -ENOENT;
			goto out;
		}
		status = ocfs2_inode_lock_full(lqinode, NULL, 1,
					       OCFS2_META_LOCK_RECOVERY);
		if (status < 0) {
			mlog_errno(status);
			goto out_put;
		}
		/* Now read local header */
		bh = NULL;
		status = ocfs2_read_quota_block(lqinode, 0, &bh);
		if (status) {
			mlog_errno(status);
			mlog(ML_ERROR, "failed to read quota file info header "
				"(slot=%d type=%d)\n", slot_num, type);
			goto out_lock;
		}
		ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
							OCFS2_LOCAL_INFO_OFF);
		status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
						   &rec->r_list[type]);
		brelse(bh);
out_lock:
		ocfs2_inode_unlock(lqinode, 1);
out_put:
		iput(lqinode);
		if (status < 0)
			break;
	}
out:
	if (status < 0) {
		ocfs2_free_quota_recovery(rec);
		rec = ERR_PTR(status);
	}
	return rec;
}

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/* Sync changes in local quota file into global quota file and
 * reinitialize local quota file.
 * The function expects local quota file to be already locked and
 * s_umount locked in shared mode. */


static int ocfs2_recover_local_quota_file(struct inode *lqinode,
					  int type,
					  struct ocfs2_quota_recovery *rec)
{
	struct super_block *sb = lqinode->i_sb;
	struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
	struct ocfs2_local_disk_chunk *dchunk;
	struct ocfs2_local_disk_dqblk *dqblk;
	struct dquot *dquot;
	handle_t *handle;
	struct buffer_head *hbh = NULL, *qbh = NULL;
	int status = 0;
	int bit, chunk;
	struct ocfs2_recovery_chunk *rchunk, *next;
	qsize_t spacechange, inodechange;

	trace_ocfs2_recover_local_quota_file((unsigned long)lqinode->i_ino, type);

	list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
		chunk = rchunk->rc_chunk;
		hbh = NULL;
		status = ocfs2_read_quota_block(lqinode,
						ol_quota_chunk_block(sb, chunk),
						&hbh);
		if (status) {
			mlog_errno(status);
			break;
		}
		dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
		for_each_set_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
			qbh = NULL;
			status = ocfs2_read_quota_block(lqinode,
						ol_dqblk_block(sb, chunk, bit),
						&qbh);
			if (status) {
				mlog_errno(status);
				break;
			}
			dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
				ol_dqblk_block_off(sb, chunk, bit));
			dquot = dqget(sb,
				      make_kqid(&init_user_ns, type,
						le64_to_cpu(dqblk->dqb_id)));
			if (IS_ERR(dquot)) {
				status = PTR_ERR(dquot);
				mlog(ML_ERROR, "Failed to get quota structure "
				     "for id %u, type %d. Cannot finish quota "
				     "file recovery.\n",
				     (unsigned)le64_to_cpu(dqblk->dqb_id),
				     type);
				goto out_put_bh;
			}
			status = ocfs2_lock_global_qf(oinfo, 1);
			if (status < 0) {
				mlog_errno(status);
				goto out_put_dquot;
			}

			handle = ocfs2_start_trans(OCFS2_SB(sb),
						   OCFS2_QSYNC_CREDITS);
			if (IS_ERR(handle)) {
				status = PTR_ERR(handle);
				mlog_errno(status);
				goto out_drop_lock;
			}
			mutex_lock(&sb_dqopt(sb)->dqio_mutex);
			spin_lock(&dq_data_lock);
			/* Add usage from quota entry into quota changes
                         * of our node. Auxiliary variables are important
                         * due to signedness */
			spacechange = le64_to_cpu(dqblk->dqb_spacemod);
			inodechange = le64_to_cpu(dqblk->dqb_inodemod);
			dquot->dq_dqb.dqb_curspace += spacechange;
			dquot->dq_dqb.dqb_curinodes += inodechange;
			spin_unlock(&dq_data_lock);
			/* We want to drop reference held by the crashed
                         * node. Since we have our own reference we know
                         * global structure actually won't be freed. */
			status = ocfs2_global_release_dquot(dquot);
			if (status < 0) {
				mlog_errno(status);
				goto out_commit;
			}
			/* Release local quota file entry */
			status = ocfs2_journal_access_dq(handle,
					INODE_CACHE(lqinode),
					qbh, OCFS2_JOURNAL_ACCESS_WRITE);
			if (status < 0) {
				mlog_errno(status);
				goto out_commit;
			}
			lock_buffer(qbh);
			WARN_ON(!ocfs2_test_bit_unaligned(bit, dchunk->dqc_bitmap));
			ocfs2_clear_bit_unaligned(bit, dchunk->dqc_bitmap);
			le32_add_cpu(&dchunk->dqc_free, 1);
			unlock_buffer(qbh);
			ocfs2_journal_dirty(handle, qbh);
out_commit:
			mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
			ocfs2_commit_trans(OCFS2_SB(sb), handle);
out_drop_lock:
			ocfs2_unlock_global_qf(oinfo, 1);
out_put_dquot:
			dqput(dquot);
out_put_bh:
			brelse(qbh);
			if (status < 0)
				break;
		}
		brelse(hbh);
		list_del(&rchunk->rc_list);
		kfree(rchunk->rc_bitmap);
		kfree(rchunk);
		if (status < 0)
			break;
	}
	if (status < 0)
		free_recovery_list(&(rec->r_list[type]));
	if (status)
		mlog_errno(status);
	return status;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jan kara
jan kara
608
94.85%
3
27.27%
joel becker
joel becker
16
2.50%
3
27.27%
eric w. biederman
eric w. biederman
8
1.25%
1
9.09%
tao ma
tao ma
6
0.94%
2
18.18%
akinobu mita
akinobu mita
3
0.47%
2
18.18%
Total
641
100.00%
11
100.00%

/* Recover local quota files for given node different from us */


int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
				struct ocfs2_quota_recovery *rec,
				int slot_num)
{
	unsigned int ino[OCFS2_MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
					      LOCAL_GROUP_QUOTA_SYSTEM_INODE };
	struct super_block *sb = osb->sb;
	struct ocfs2_local_disk_dqinfo *ldinfo;
	struct buffer_head *bh;
	handle_t *handle;
	int type;
	int status = 0;
	struct inode *lqinode;
	unsigned int flags;

	printk(KERN_NOTICE "ocfs2: Finishing quota recovery on device (%s) for "
	       "slot %u\n", osb->dev_str, slot_num);

	down_read(&sb->s_umount)