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path: root/fs/ocfs2/quota_local.c
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Diffstat (limited to 'fs/ocfs2/quota_local.c')
-rw-r--r--fs/ocfs2/quota_local.c833
1 files changed, 833 insertions, 0 deletions
diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c
new file mode 100644
index 000000000000..55c3f2f98dcd
--- /dev/null
+++ b/fs/ocfs2/quota_local.c
@@ -0,0 +1,833 @@
+/*
+ * Implementation of operations over local quota file
+ */
+
+#include <linux/fs.h>
+#include <linux/quota.h>
+#include <linux/quotaops.h>
+#include <linux/module.h>
+
+#define MLOG_MASK_PREFIX ML_QUOTA
+#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"
+
+/* 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));
+}
+
+/* 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);
+}
+
+/* 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);
+}
+
+/* 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;
+}
+
+/* Offset of the dquot structure in the quota file */
+static loff_t ol_dqblk_off(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)
+ << sb->s_blocksize_bits) +
+ (off % epb) * sizeof(struct ocfs2_local_disk_dqblk);
+}
+
+/* Compute block number from given offset */
+static inline unsigned int ol_dqblk_file_block(struct super_block *sb, loff_t off)
+{
+ return off >> sb->s_blocksize_bits;
+}
+
+static inline unsigned int ol_dqblk_block_offset(struct super_block *sb, loff_t off)
+{
+ return off & ((1 << sb->s_blocksize_bits) - 1);
+}
+
+/* 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);
+}
+
+/* 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), 1);
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ mlog_errno(status);
+ return status;
+ }
+ status = ocfs2_journal_access(handle, 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);
+ status = ocfs2_journal_dirty(handle, bh);
+ if (status < 0) {
+ mlog_errno(status);
+ ocfs2_commit_trans(OCFS2_SB(sb), handle);
+ return status;
+ }
+ status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
+ if (status < 0) {
+ mlog_errno(status);
+ return status;
+ }
+ return 0;
+}
+
+/* Check whether we understand format of quota files */
+static int ocfs2_local_check_quota_file(struct super_block *sb, int type)
+{
+ unsigned int lmagics[MAXQUOTAS] = OCFS2_LOCAL_QMAGICS;
+ unsigned int lversions[MAXQUOTAS] = OCFS2_LOCAL_QVERSIONS;
+ unsigned int gmagics[MAXQUOTAS] = OCFS2_GLOBAL_QMAGICS;
+ unsigned int gversions[MAXQUOTAS] = OCFS2_GLOBAL_QVERSIONS;
+ unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
+ GROUP_QUOTA_SYSTEM_INODE };
+ struct buffer_head *bh;
+ 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 */
+ bh = ocfs2_read_quota_block(linode, 0, &status);
+ if (!bh) {
+ 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 */
+ bh = ocfs2_read_quota_block(ginode, 0, &status);
+ if (!bh) {
+ 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;
+}
+
+/* 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);
+ }
+}
+
+/* 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 = ocfs2_read_quota_block(inode,
+ ol_quota_chunk_block(inode->i_sb, i),
+ &status);
+ if (!newchunk->qc_headerbh) {
+ 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;
+}
+
+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(info->dqi_flags & DQF_MASK);
+ ldinfo->dqi_chunks = cpu_to_le32(oinfo->dqi_chunks);
+ ldinfo->dqi_blocks = cpu_to_le32(oinfo->dqi_blocks);
+ spin_unlock(&dq_data_lock);
+}
+
+/* Read information header from quota file */
+static int ocfs2_local_read_info(struct super_block *sb, int type)
+{
+ struct ocfs2_local_disk_dqinfo *ldinfo;
+ struct mem_dqinfo *info = sb_dqinfo(sb, type);
+ struct ocfs2_mem_dqinfo *oinfo;
+ struct inode *lqinode = sb_dqopt(sb)->files[type];
+ int status;
+ struct buffer_head *bh = NULL;
+ int locked = 0;
+
+ info->dqi_maxblimit = 0x7fffffffffffffffLL;
+ info->dqi_maxilimit = 0x7fffffffffffffffLL;
+ oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
+ if (!oinfo) {
+ mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
+ " info.");
+ goto out_err;
+ }
+ info->dqi_priv = oinfo;
+ oinfo->dqi_type = type;
+ INIT_LIST_HEAD(&oinfo->dqi_chunk);
+ oinfo->dqi_lqi_bh = NULL;
+ oinfo->dqi_ibh = NULL;
+
+ status = ocfs2_global_read_info(sb, type);
+ if (status < 0)
+ goto out_err;
+
+ status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_err;
+ }
+ locked = 1;
+
+ /* Now read local header */
+ bh = ocfs2_read_quota_block(lqinode, 0, &status);
+ if (!bh) {
+ mlog_errno(status);
+ mlog(ML_ERROR, "failed to read quota file info header "
+ "(type=%d)\n", type);
+ goto out_err;
+ }
+ ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
+ OCFS2_LOCAL_INFO_OFF);
+ info->dqi_flags = le32_to_cpu(ldinfo->dqi_flags);
+ oinfo->dqi_chunks = le32_to_cpu(ldinfo->dqi_chunks);
+ oinfo->dqi_blocks = le32_to_cpu(ldinfo->dqi_blocks);
+ oinfo->dqi_ibh = bh;
+
+ /* We crashed when using local quota file? */
+ if (!(info->dqi_flags & OLQF_CLEAN))
+ goto out_err; /* So far we just bail out. Later we should resync here */
+
+ status = ocfs2_load_local_quota_bitmaps(sb_dqopt(sb)->files[type],
+ ldinfo,
+ &oinfo->dqi_chunk);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_err;
+ }
+
+ /* Now mark quota file as used */
+ info->dqi_flags &= ~OLQF_CLEAN;
+ status = ocfs2_modify_bh(lqinode, bh, olq_update_info, info);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_err;
+ }
+
+ return 0;
+out_err:
+ if (oinfo) {
+ iput(oinfo->dqi_gqinode);
+ ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
+ ocfs2_lock_res_free(&oinfo->dqi_gqlock);
+ brelse(oinfo->dqi_lqi_bh);
+ if (locked)
+ ocfs2_inode_unlock(lqinode, 1);
+ ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
+ kfree(oinfo);
+ }
+ brelse(bh);
+ return -1;
+}
+
+/* Write local info to quota file */
+static int ocfs2_local_write_info(struct super_block *sb, int type)
+{
+ struct mem_dqinfo *info = sb_dqinfo(sb, type);
+ struct buffer_head *bh = ((struct ocfs2_mem_dqinfo *)info->dqi_priv)
+ ->dqi_ibh;
+ int status;
+
+ status = ocfs2_modify_bh(sb_dqopt(sb)->files[type], bh, olq_update_info,
+ info);
+ if (status < 0) {
+ mlog_errno(status);
+ return -1;
+ }
+
+ return 0;
+}
+
+/* Release info from memory */
+static int ocfs2_local_free_info(struct super_block *sb, int type)
+{
+ struct mem_dqinfo *info = sb_dqinfo(sb, type);
+ struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
+ struct ocfs2_quota_chunk *chunk;
+ struct ocfs2_local_disk_chunk *dchunk;
+ int mark_clean = 1, len;
+ int status;
+
+ iput(oinfo->dqi_gqinode);
+ ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
+ ocfs2_lock_res_free(&oinfo->dqi_gqlock);
+ list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
+ dchunk = (struct ocfs2_local_disk_chunk *)
+ (chunk->qc_headerbh->b_data);
+ if (chunk->qc_num < oinfo->dqi_chunks - 1) {
+ len = ol_chunk_entries(sb);
+ } else {
+ len = (oinfo->dqi_blocks -
+ ol_quota_chunk_block(sb, chunk->qc_num) - 1)
+ * ol_quota_entries_per_block(sb);
+ }
+ /* Not all entries free? Bug! */
+ if (le32_to_cpu(dchunk->dqc_free) != len) {
+ mlog(ML_ERROR, "releasing quota file with used "
+ "entries (type=%d)\n", type);
+ mark_clean = 0;
+ }
+ }
+ ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
+
+ if (!mark_clean)
+ goto out;
+
+ /* Mark local file as clean */
+ info->dqi_flags |= OLQF_CLEAN;
+ status = ocfs2_modify_bh(sb_dqopt(sb)->files[type],
+ oinfo->dqi_ibh,
+ olq_update_info,
+ info);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+
+out:
+ ocfs2_inode_unlock(sb_dqopt(sb)->files[type], 1);
+ brelse(oinfo->dqi_ibh);
+ brelse(oinfo->dqi_lqi_bh);
+ kfree(oinfo);
+ return 0;
+}
+
+static void olq_set_dquot(struct buffer_head *bh, void *private)
+{
+ struct ocfs2_dquot *od = private;
+ struct ocfs2_local_disk_dqblk *dqblk;
+ struct super_block *sb = od->dq_dquot.dq_sb;
+
+ dqblk = (struct ocfs2_local_disk_dqblk *)(bh->b_data
+ + ol_dqblk_block_offset(sb, od->dq_local_off));
+
+ dqblk->dqb_id = cpu_to_le64(od->dq_dquot.dq_id);
+ spin_lock(&dq_data_lock);
+ dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace -
+ od->dq_origspace);
+ dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes -
+ od->dq_originodes);
+ spin_unlock(&dq_data_lock);
+ mlog(0, "Writing local dquot %u space %lld inodes %lld\n",
+ od->dq_dquot.dq_id, dqblk->dqb_spacemod, dqblk->dqb_inodemod);
+}
+
+/* Write dquot to local quota file */
+static int ocfs2_local_write_dquot(struct dquot *dquot)
+{
+ struct super_block *sb = dquot->dq_sb;
+ struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
+ struct buffer_head *bh;
+ int status;
+
+ bh = ocfs2_read_quota_block(sb_dqopt(sb)->files[dquot->dq_type],
+ ol_dqblk_file_block(sb, od->dq_local_off),
+ &status);
+ if (!bh) {
+ mlog_errno(status);
+ goto out;
+ }
+ status = ocfs2_modify_bh(sb_dqopt(sb)->files[dquot->dq_type], bh,
+ olq_set_dquot, od);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+out:
+ brelse(bh);
+ return status;
+}
+
+/* Find free entry in local quota file */
+static struct ocfs2_quota_chunk *ocfs2_find_free_entry(struct super_block *sb,
+ int type,
+ int *offset)
+{
+ struct mem_dqinfo *info = sb_dqinfo(sb, type);
+ struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
+ struct ocfs2_quota_chunk *chunk;
+ struct ocfs2_local_disk_chunk *dchunk;
+ int found = 0, len;
+
+ list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
+ dchunk = (struct ocfs2_local_disk_chunk *)
+ chunk->qc_headerbh->b_data;
+ if (le32_to_cpu(dchunk->dqc_free) > 0) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ return NULL;
+
+ if (chunk->qc_num < oinfo->dqi_chunks - 1) {
+ len = ol_chunk_entries(sb);
+ } else {
+ len = (oinfo->dqi_blocks -
+ ol_quota_chunk_block(sb, chunk->qc_num) - 1)
+ * ol_quota_entries_per_block(sb);
+ }
+
+ found = ocfs2_find_next_zero_bit(dchunk->dqc_bitmap, len, 0);
+ /* We failed? */
+ if (found == len) {
+ mlog(ML_ERROR, "Did not find empty entry in chunk %d with %u"
+ " entries free (type=%d)\n", chunk->qc_num,
+ le32_to_cpu(dchunk->dqc_free), type);
+ return ERR_PTR(-EIO);
+ }
+ *offset = found;
+ return chunk;
+}
+
+/* Add new chunk to the local quota file */
+static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
+ struct super_block *sb,
+ int type,
+ int *offset)
+{
+ struct mem_dqinfo *info = sb_dqinfo(sb, type);
+ struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
+ struct inode *lqinode = sb_dqopt(sb)->files[type];
+ struct ocfs2_quota_chunk *chunk = NULL;
+ struct ocfs2_local_disk_chunk *dchunk;
+ int status;
+ handle_t *handle;
+ struct buffer_head *bh = NULL;
+ u64 p_blkno;
+
+ /* We are protected by dqio_sem so no locking needed */
+ status = ocfs2_extend_no_holes(lqinode,
+ lqinode->i_size + 2 * sb->s_blocksize,
+ lqinode->i_size);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+ status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
+ lqinode->i_size + 2 * sb->s_blocksize);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+
+ chunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
+ if (!chunk) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto out;
+ }
+
+ down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
+ status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
+ &p_blkno, NULL, NULL);
+ up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+ bh = sb_getblk(sb, p_blkno);
+ if (!bh) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto out;
+ }
+ dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
+
+ handle = ocfs2_start_trans(OCFS2_SB(sb), 2);
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ mlog_errno(status);
+ goto out;
+ }
+
+ status = ocfs2_journal_access(handle, lqinode, bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_trans;
+ }
+ lock_buffer(bh);
+ dchunk->dqc_free = ol_quota_entries_per_block(sb);
+ memset(dchunk->dqc_bitmap, 0,
+ sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
+ OCFS2_QBLK_RESERVED_SPACE);
+ set_buffer_uptodate(bh);
+ unlock_buffer(bh);
+ status = ocfs2_journal_dirty(handle, bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_trans;
+ }
+
+ oinfo->dqi_blocks += 2;
+ oinfo->dqi_chunks++;
+ status = ocfs2_local_write_info(sb, type);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_trans;
+ }
+ status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+
+ list_add_tail(&chunk->qc_chunk, &oinfo->dqi_chunk);
+ chunk->qc_num = list_entry(chunk->qc_chunk.prev,
+ struct ocfs2_quota_chunk,
+ qc_chunk)->qc_num + 1;
+ chunk->qc_headerbh = bh;
+ *offset = 0;
+ return chunk;
+out_trans:
+ ocfs2_commit_trans(OCFS2_SB(sb), handle);
+out:
+ brelse(bh);
+ kmem_cache_free(ocfs2_qf_chunk_cachep, chunk);
+ return ERR_PTR(status);
+}
+
+/* Find free entry in local quota file */
+static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
+ struct super_block *sb,
+ int type,
+ int *offset)
+{
+ struct mem_dqinfo *info = sb_dqinfo(sb, type);
+ struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
+ struct ocfs2_quota_chunk *chunk;
+ struct inode *lqinode = sb_dqopt(sb)->files[type];
+ struct ocfs2_local_disk_chunk *dchunk;
+ int epb = ol_quota_entries_per_block(sb);
+ unsigned int chunk_blocks;
+ int status;
+ handle_t *handle;
+
+ if (list_empty(&oinfo->dqi_chunk))
+ return ocfs2_local_quota_add_chunk(sb, type, offset);
+ /* Is the last chunk full? */
+ chunk = list_entry(oinfo->dqi_chunk.prev,
+ struct ocfs2_quota_chunk, qc_chunk);
+ chunk_blocks = oinfo->dqi_blocks -
+ ol_quota_chunk_block(sb, chunk->qc_num) - 1;
+ if (ol_chunk_blocks(sb) == chunk_blocks)
+ return ocfs2_local_quota_add_chunk(sb, type, offset);
+
+ /* We are protected by dqio_sem so no locking needed */
+ status = ocfs2_extend_no_holes(lqinode,
+ lqinode->i_size + sb->s_blocksize,
+ lqinode->i_size);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+ status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
+ lqinode->i_size + sb->s_blocksize);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+ handle = ocfs2_start_trans(OCFS2_SB(sb), 2);
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ mlog_errno(status);
+ goto out;
+ }
+ status = ocfs2_journal_access(handle, lqinode, chunk->qc_headerbh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_trans;
+ }
+
+ dchunk = (struct ocfs2_local_disk_chunk *)chunk->qc_headerbh->b_data;
+ lock_buffer(chunk->qc_headerbh);
+ le32_add_cpu(&dchunk->dqc_free, ol_quota_entries_per_block(sb));
+ unlock_buffer(chunk->qc_headerbh);
+ status = ocfs2_journal_dirty(handle, chunk->qc_headerbh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_trans;
+ }
+ oinfo->dqi_blocks++;
+ status = ocfs2_local_write_info(sb, type);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_trans;
+ }
+
+ status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+ *offset = chunk_blocks * epb;
+ return chunk;
+out_trans:
+ ocfs2_commit_trans(OCFS2_SB(sb), handle);
+out:
+ return ERR_PTR(status);
+}
+
+void olq_alloc_dquot(struct buffer_head *bh, void *private)
+{
+ int *offset = private;
+ struct ocfs2_local_disk_chunk *dchunk;
+
+ dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
+ ocfs2_set_bit(*offset, dchunk->dqc_bitmap);
+ le32_add_cpu(&dchunk->dqc_free, -1);
+}
+
+/* Create dquot in the local file for given id */
+static int ocfs2_create_local_dquot(struct dquot *dquot)
+{
+ struct super_block *sb = dquot->dq_sb;
+ int type = dquot->dq_type;
+ struct inode *lqinode = sb_dqopt(sb)->files[type];
+ struct ocfs2_quota_chunk *chunk;
+ struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
+ int offset;
+ int status;
+
+ chunk = ocfs2_find_free_entry(sb, type, &offset);
+ if (!chunk) {
+ chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
+ if (IS_ERR(chunk))
+ return PTR_ERR(chunk);
+ } else if (IS_ERR(chunk)) {
+ return PTR_ERR(chunk);
+ }
+ od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
+ od->dq_chunk = chunk;
+
+ /* Initialize dquot structure on disk */
+ status = ocfs2_local_write_dquot(dquot);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+
+ /* Mark structure as allocated */
+ status = ocfs2_modify_bh(lqinode, chunk->qc_headerbh, olq_alloc_dquot,
+ &offset);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+out:
+ return status;
+}
+
+/* Create entry in local file for dquot, load data from the global file */
+static int ocfs2_local_read_dquot(struct dquot *dquot)
+{
+ int status;
+
+ mlog_entry("id=%u, type=%d\n", dquot->dq_id, dquot->dq_type);
+
+ status = ocfs2_global_read_dquot(dquot);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_err;
+ }
+
+ /* Now create entry in the local quota file */
+ status = ocfs2_create_local_dquot(dquot);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_err;
+ }
+ mlog_exit(0);
+ return 0;
+out_err:
+ mlog_exit(status);
+ return status;
+}
+
+/* Release dquot structure from local quota file. ocfs2_release_dquot() has
+ * already started a transaction and obtained exclusive lock for global
+ * quota file. */
+static int ocfs2_local_release_dquot(struct dquot *dquot)
+{
+ int status;
+ int type = dquot->dq_type;
+ struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
+ struct super_block *sb = dquot->dq_sb;
+ struct ocfs2_local_disk_chunk *dchunk;
+ int offset;
+ handle_t *handle = journal_current_handle();
+
+ BUG_ON(!handle);
+ /* First write all local changes to global file */
+ status = ocfs2_global_release_dquot(dquot);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+
+ status = ocfs2_journal_access(handle, sb_dqopt(sb)->files[type],
+ od->dq_chunk->qc_headerbh, OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+ offset = ol_dqblk_chunk_off(sb, od->dq_chunk->qc_num,
+ od->dq_local_off);
+ dchunk = (struct ocfs2_local_disk_chunk *)
+ (od->dq_chunk->qc_headerbh->b_data);
+ /* Mark structure as freed */
+ lock_buffer(od->dq_chunk->qc_headerbh);
+ ocfs2_clear_bit(offset, dchunk->dqc_bitmap);
+ le32_add_cpu(&dchunk->dqc_free, 1);
+ unlock_buffer(od->dq_chunk->qc_headerbh);
+ status = ocfs2_journal_dirty(handle, od->dq_chunk->qc_headerbh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
+ status = 0;
+out:
+ /* Clear the read bit so that next time someone uses this
+ * dquot he reads fresh info from disk and allocates local
+ * dquot structure */
+ clear_bit(DQ_READ_B, &dquot->dq_flags);
+ return status;
+}
+
+static struct quota_format_ops ocfs2_format_ops = {
+ .check_quota_file = ocfs2_local_check_quota_file,
+ .read_file_info = ocfs2_local_read_info,
+ .write_file_info = ocfs2_global_write_info,
+ .free_file_info = ocfs2_local_free_info,
+ .read_dqblk = ocfs2_local_read_dquot,
+ .commit_dqblk = ocfs2_local_write_dquot,
+ .release_dqblk = ocfs2_local_release_dquot,
+};
+
+struct quota_format_type ocfs2_quota_format = {
+ .qf_fmt_id = QFMT_OCFS2,
+ .qf_ops = &ocfs2_format_ops,
+ .qf_owner = THIS_MODULE
+};