summaryrefslogtreecommitdiffstats
path: root/fs/ocfs2/quota_global.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/ocfs2/quota_global.c')
-rw-r--r--fs/ocfs2/quota_global.c919
1 files changed, 919 insertions, 0 deletions
diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c
new file mode 100644
index 0000000..af8340c
--- /dev/null
+++ b/fs/ocfs2/quota_global.c
@@ -0,0 +1,919 @@
+/*
+ * Implementation of operations over global quota file
+ */
+#include <linux/fs.h>
+#include <linux/quota.h>
+#include <linux/quotaops.h>
+#include <linux/dqblk_qtree.h>
+
+#define MLOG_MASK_PREFIX ML_QUOTA
+#include <cluster/masklog.h>
+
+#include "ocfs2_fs.h"
+#include "ocfs2.h"
+#include "alloc.h"
+#include "inode.h"
+#include "journal.h"
+#include "file.h"
+#include "sysfile.h"
+#include "dlmglue.h"
+#include "uptodate.h"
+#include "quota.h"
+
+static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
+{
+ struct ocfs2_global_disk_dqblk *d = dp;
+ struct mem_dqblk *m = &dquot->dq_dqb;
+
+ /* Update from disk only entries not set by the admin */
+ if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
+ m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
+ m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
+ }
+ if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
+ m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
+ if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
+ m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
+ m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
+ }
+ if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
+ m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
+ if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
+ m->dqb_btime = le64_to_cpu(d->dqb_btime);
+ if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
+ m->dqb_itime = le64_to_cpu(d->dqb_itime);
+ OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
+}
+
+static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
+{
+ struct ocfs2_global_disk_dqblk *d = dp;
+ struct mem_dqblk *m = &dquot->dq_dqb;
+
+ d->dqb_id = cpu_to_le32(dquot->dq_id);
+ d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
+ d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
+ d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
+ d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
+ d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
+ d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
+ d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
+ d->dqb_btime = cpu_to_le64(m->dqb_btime);
+ d->dqb_itime = cpu_to_le64(m->dqb_itime);
+}
+
+static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
+{
+ struct ocfs2_global_disk_dqblk *d = dp;
+ struct ocfs2_mem_dqinfo *oinfo =
+ sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
+
+ if (qtree_entry_unused(&oinfo->dqi_gi, dp))
+ return 0;
+ return le32_to_cpu(d->dqb_id) == dquot->dq_id;
+}
+
+struct qtree_fmt_operations ocfs2_global_ops = {
+ .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
+ .disk2mem_dqblk = ocfs2_global_disk2memdqb,
+ .is_id = ocfs2_global_is_id,
+};
+
+
+struct buffer_head *ocfs2_read_quota_block(struct inode *inode,
+ int block, int *err)
+{
+ struct buffer_head *tmp = NULL;
+
+ *err = ocfs2_read_virt_blocks(inode, block, 1, &tmp, 0, NULL);
+ if (*err)
+ mlog_errno(*err);
+
+ return tmp;
+}
+
+static struct buffer_head *ocfs2_get_quota_block(struct inode *inode,
+ int block, int *err)
+{
+ u64 pblock, pcount;
+ struct buffer_head *bh;
+
+ down_read(&OCFS2_I(inode)->ip_alloc_sem);
+ *err = ocfs2_extent_map_get_blocks(inode, block, &pblock, &pcount,
+ NULL);
+ up_read(&OCFS2_I(inode)->ip_alloc_sem);
+ if (*err) {
+ mlog_errno(*err);
+ return NULL;
+ }
+ bh = sb_getblk(inode->i_sb, pblock);
+ if (!bh) {
+ *err = -EIO;
+ mlog_errno(*err);
+ }
+ return bh;
+}
+
+/* Read data from global quotafile - avoid pagecache and such because we cannot
+ * afford acquiring the locks... We use quota cluster lock to serialize
+ * operations. Caller is responsible for acquiring it. */
+ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
+ size_t len, loff_t off)
+{
+ struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
+ struct inode *gqinode = oinfo->dqi_gqinode;
+ loff_t i_size = i_size_read(gqinode);
+ int offset = off & (sb->s_blocksize - 1);
+ sector_t blk = off >> sb->s_blocksize_bits;
+ int err = 0;
+ struct buffer_head *bh;
+ size_t toread, tocopy;
+
+ if (off > i_size)
+ return 0;
+ if (off + len > i_size)
+ len = i_size - off;
+ toread = len;
+ while (toread > 0) {
+ tocopy = min((size_t)(sb->s_blocksize - offset), toread);
+ bh = ocfs2_read_quota_block(gqinode, blk, &err);
+ if (!bh) {
+ mlog_errno(err);
+ return err;
+ }
+ memcpy(data, bh->b_data + offset, tocopy);
+ brelse(bh);
+ offset = 0;
+ toread -= tocopy;
+ data += tocopy;
+ blk++;
+ }
+ return len;
+}
+
+/* Write to quotafile (we know the transaction is already started and has
+ * enough credits) */
+ssize_t ocfs2_quota_write(struct super_block *sb, int type,
+ const char *data, size_t len, loff_t off)
+{
+ struct mem_dqinfo *info = sb_dqinfo(sb, type);
+ struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
+ struct inode *gqinode = oinfo->dqi_gqinode;
+ int offset = off & (sb->s_blocksize - 1);
+ sector_t blk = off >> sb->s_blocksize_bits;
+ int err = 0, new = 0;
+ struct buffer_head *bh;
+ handle_t *handle = journal_current_handle();
+
+ if (!handle) {
+ mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
+ "because transaction was not started.\n",
+ (unsigned long long)off, (unsigned long long)len);
+ return -EIO;
+ }
+ if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
+ WARN_ON(1);
+ len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
+ }
+
+ mutex_lock_nested(&gqinode->i_mutex, I_MUTEX_QUOTA);
+ if (gqinode->i_size < off + len) {
+ down_write(&OCFS2_I(gqinode)->ip_alloc_sem);
+ err = ocfs2_extend_no_holes(gqinode, off + len, off);
+ up_write(&OCFS2_I(gqinode)->ip_alloc_sem);
+ if (err < 0)
+ goto out;
+ err = ocfs2_simple_size_update(gqinode,
+ oinfo->dqi_gqi_bh,
+ off + len);
+ if (err < 0)
+ goto out;
+ new = 1;
+ }
+ /* Not rewriting whole block? */
+ if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
+ !new) {
+ bh = ocfs2_read_quota_block(gqinode, blk, &err);
+ if (!bh) {
+ mlog_errno(err);
+ return err;
+ }
+ err = ocfs2_journal_access(handle, gqinode, bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ } else {
+ bh = ocfs2_get_quota_block(gqinode, blk, &err);
+ if (!bh) {
+ mlog_errno(err);
+ return err;
+ }
+ err = ocfs2_journal_access(handle, gqinode, bh,
+ OCFS2_JOURNAL_ACCESS_CREATE);
+ }
+ if (err < 0) {
+ brelse(bh);
+ goto out;
+ }
+ lock_buffer(bh);
+ if (new)
+ memset(bh->b_data, 0, sb->s_blocksize);
+ memcpy(bh->b_data + offset, data, len);
+ flush_dcache_page(bh->b_page);
+ unlock_buffer(bh);
+ ocfs2_set_buffer_uptodate(gqinode, bh);
+ err = ocfs2_journal_dirty(handle, bh);
+ brelse(bh);
+ if (err < 0)
+ goto out;
+out:
+ if (err) {
+ mutex_unlock(&gqinode->i_mutex);
+ mlog_errno(err);
+ return err;
+ }
+ gqinode->i_version++;
+ ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
+ mutex_unlock(&gqinode->i_mutex);
+ return len;
+}
+
+int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
+{
+ int status;
+ struct buffer_head *bh = NULL;
+
+ status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
+ if (status < 0)
+ return status;
+ spin_lock(&dq_data_lock);
+ if (!oinfo->dqi_gqi_count++)
+ oinfo->dqi_gqi_bh = bh;
+ else
+ WARN_ON(bh != oinfo->dqi_gqi_bh);
+ spin_unlock(&dq_data_lock);
+ return 0;
+}
+
+void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
+{
+ ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
+ brelse(oinfo->dqi_gqi_bh);
+ spin_lock(&dq_data_lock);
+ if (!--oinfo->dqi_gqi_count)
+ oinfo->dqi_gqi_bh = NULL;
+ spin_unlock(&dq_data_lock);
+}
+
+/* Read information header from global quota file */
+int ocfs2_global_read_info(struct super_block *sb, int type)
+{
+ struct inode *gqinode = NULL;
+ unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
+ GROUP_QUOTA_SYSTEM_INODE };
+ struct ocfs2_global_disk_dqinfo dinfo;
+ struct mem_dqinfo *info = sb_dqinfo(sb, type);
+ struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
+ int status;
+
+ mlog_entry_void();
+
+ /* Read global header */
+ gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
+ OCFS2_INVALID_SLOT);
+ if (!gqinode) {
+ mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
+ type);
+ status = -EINVAL;
+ goto out_err;
+ }
+ oinfo->dqi_gi.dqi_sb = sb;
+ oinfo->dqi_gi.dqi_type = type;
+ ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
+ oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
+ oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
+ oinfo->dqi_gqi_bh = NULL;
+ oinfo->dqi_gqi_count = 0;
+ oinfo->dqi_gqinode = gqinode;
+ status = ocfs2_lock_global_qf(oinfo, 0);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_err;
+ }
+ status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
+ sizeof(struct ocfs2_global_disk_dqinfo),
+ OCFS2_GLOBAL_INFO_OFF);
+ ocfs2_unlock_global_qf(oinfo, 0);
+ if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
+ mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
+ status);
+ if (status >= 0)
+ status = -EIO;
+ mlog_errno(status);
+ goto out_err;
+ }
+ info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
+ info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
+ oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
+ oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
+ oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
+ oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
+ oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
+ oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
+ OCFS2_QBLK_RESERVED_SPACE;
+ oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
+out_err:
+ mlog_exit(status);
+ return status;
+}
+
+/* Write information to global quota file. Expects exlusive lock on quota
+ * file inode and quota info */
+static int __ocfs2_global_write_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_global_disk_dqinfo dinfo;
+ ssize_t size;
+
+ spin_lock(&dq_data_lock);
+ info->dqi_flags &= ~DQF_INFO_DIRTY;
+ dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
+ dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
+ spin_unlock(&dq_data_lock);
+ dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
+ dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
+ dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
+ dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
+ size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
+ sizeof(struct ocfs2_global_disk_dqinfo),
+ OCFS2_GLOBAL_INFO_OFF);
+ if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
+ mlog(ML_ERROR, "Cannot write global quota info structure\n");
+ if (size >= 0)
+ size = -EIO;
+ return size;
+ }
+ return 0;
+}
+
+int ocfs2_global_write_info(struct super_block *sb, int type)
+{
+ int err;
+ struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
+
+ err = ocfs2_qinfo_lock(info, 1);
+ if (err < 0)
+ return err;
+ err = __ocfs2_global_write_info(sb, type);
+ ocfs2_qinfo_unlock(info, 1);
+ return err;
+}
+
+/* Read in information from global quota file and acquire a reference to it.
+ * dquot_acquire() has already started the transaction and locked quota file */
+int ocfs2_global_read_dquot(struct dquot *dquot)
+{
+ int err, err2, ex = 0;
+ struct ocfs2_mem_dqinfo *info =
+ sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
+
+ err = ocfs2_qinfo_lock(info, 0);
+ if (err < 0)
+ goto out;
+ err = qtree_read_dquot(&info->dqi_gi, dquot);
+ if (err < 0)
+ goto out_qlock;
+ OCFS2_DQUOT(dquot)->dq_use_count++;
+ OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
+ OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
+ if (!dquot->dq_off) { /* No real quota entry? */
+ /* Upgrade to exclusive lock for allocation */
+ err = ocfs2_qinfo_lock(info, 1);
+ if (err < 0)
+ goto out_qlock;
+ ex = 1;
+ }
+ err = qtree_write_dquot(&info->dqi_gi, dquot);
+ if (ex && info_dirty(sb_dqinfo(dquot->dq_sb, dquot->dq_type))) {
+ err2 = __ocfs2_global_write_info(dquot->dq_sb, dquot->dq_type);
+ if (!err)
+ err = err2;
+ }
+out_qlock:
+ if (ex)
+ ocfs2_qinfo_unlock(info, 1);
+ ocfs2_qinfo_unlock(info, 0);
+out:
+ if (err < 0)
+ mlog_errno(err);
+ return err;
+}
+
+/* Sync local information about quota modifications with global quota file.
+ * Caller must have started the transaction and obtained exclusive lock for
+ * global quota file inode */
+int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
+{
+ int err, err2;
+ struct super_block *sb = dquot->dq_sb;
+ int type = dquot->dq_type;
+ struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
+ struct ocfs2_global_disk_dqblk dqblk;
+ s64 spacechange, inodechange;
+ time_t olditime, oldbtime;
+
+ err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
+ sizeof(struct ocfs2_global_disk_dqblk),
+ dquot->dq_off);
+ if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
+ if (err >= 0) {
+ mlog(ML_ERROR, "Short read from global quota file "
+ "(%u read)\n", err);
+ err = -EIO;
+ }
+ goto out;
+ }
+
+ /* Update space and inode usage. Get also other information from
+ * global quota file so that we don't overwrite any changes there.
+ * We are */
+ spin_lock(&dq_data_lock);
+ spacechange = dquot->dq_dqb.dqb_curspace -
+ OCFS2_DQUOT(dquot)->dq_origspace;
+ inodechange = dquot->dq_dqb.dqb_curinodes -
+ OCFS2_DQUOT(dquot)->dq_originodes;
+ olditime = dquot->dq_dqb.dqb_itime;
+ oldbtime = dquot->dq_dqb.dqb_btime;
+ ocfs2_global_disk2memdqb(dquot, &dqblk);
+ mlog(0, "Syncing global dquot %d space %lld+%lld, inodes %lld+%lld\n",
+ dquot->dq_id, dquot->dq_dqb.dqb_curspace, spacechange,
+ dquot->dq_dqb.dqb_curinodes, inodechange);
+ if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
+ dquot->dq_dqb.dqb_curspace += spacechange;
+ if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
+ dquot->dq_dqb.dqb_curinodes += inodechange;
+ /* Set properly space grace time... */
+ if (dquot->dq_dqb.dqb_bsoftlimit &&
+ dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
+ if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
+ oldbtime > 0) {
+ if (dquot->dq_dqb.dqb_btime > 0)
+ dquot->dq_dqb.dqb_btime =
+ min(dquot->dq_dqb.dqb_btime, oldbtime);
+ else
+ dquot->dq_dqb.dqb_btime = oldbtime;
+ }
+ } else {
+ dquot->dq_dqb.dqb_btime = 0;
+ clear_bit(DQ_BLKS_B, &dquot->dq_flags);
+ }
+ /* Set properly inode grace time... */
+ if (dquot->dq_dqb.dqb_isoftlimit &&
+ dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
+ if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
+ olditime > 0) {
+ if (dquot->dq_dqb.dqb_itime > 0)
+ dquot->dq_dqb.dqb_itime =
+ min(dquot->dq_dqb.dqb_itime, olditime);
+ else
+ dquot->dq_dqb.dqb_itime = olditime;
+ }
+ } else {
+ dquot->dq_dqb.dqb_itime = 0;
+ clear_bit(DQ_INODES_B, &dquot->dq_flags);
+ }
+ /* All information is properly updated, clear the flags */
+ __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
+ __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
+ __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
+ __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
+ __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
+ __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
+ OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
+ OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
+ spin_unlock(&dq_data_lock);
+ err = ocfs2_qinfo_lock(info, freeing);
+ if (err < 0) {
+ mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
+ " (type=%d, id=%u)\n", dquot->dq_type,
+ (unsigned)dquot->dq_id);
+ goto out;
+ }
+ if (freeing)
+ OCFS2_DQUOT(dquot)->dq_use_count--;
+ err = qtree_write_dquot(&info->dqi_gi, dquot);
+ if (err < 0)
+ goto out_qlock;
+ if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
+ err = qtree_release_dquot(&info->dqi_gi, dquot);
+ if (info_dirty(sb_dqinfo(sb, type))) {
+ err2 = __ocfs2_global_write_info(sb, type);
+ if (!err)
+ err = err2;
+ }
+ }
+out_qlock:
+ ocfs2_qinfo_unlock(info, freeing);
+out:
+ if (err < 0)
+ mlog_errno(err);
+ return err;
+}
+
+/*
+ * Wrappers for generic quota functions
+ */
+
+static int ocfs2_write_dquot(struct dquot *dquot)
+{
+ handle_t *handle;
+ struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
+ int status = 0;
+
+ mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
+
+ handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ mlog_errno(status);
+ goto out;
+ }
+ status = dquot_commit(dquot);
+ ocfs2_commit_trans(osb, handle);
+out:
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
+{
+ struct ocfs2_mem_dqinfo *oinfo;
+ int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
+ OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
+
+ if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
+ return 0;
+
+ oinfo = sb_dqinfo(sb, type)->dqi_priv;
+ /* We modify tree, leaf block, global info, local chunk header,
+ * global and local inode */
+ return oinfo->dqi_gi.dqi_qtree_depth + 2 + 1 +
+ 2 * OCFS2_INODE_UPDATE_CREDITS;
+}
+
+static int ocfs2_release_dquot(struct dquot *dquot)
+{
+ handle_t *handle;
+ struct ocfs2_mem_dqinfo *oinfo =
+ sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
+ struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
+ int status = 0;
+
+ mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
+
+ status = ocfs2_lock_global_qf(oinfo, 1);
+ if (status < 0)
+ goto out;
+ handle = ocfs2_start_trans(osb,
+ ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ mlog_errno(status);
+ goto out_ilock;
+ }
+ status = dquot_release(dquot);
+ ocfs2_commit_trans(osb, handle);
+out_ilock:
+ ocfs2_unlock_global_qf(oinfo, 1);
+out:
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_calc_qinit_credits(struct super_block *sb, int type)
+{
+ struct ocfs2_mem_dqinfo *oinfo;
+ int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
+ OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
+ struct ocfs2_dinode *lfe, *gfe;
+
+ if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
+ return 0;
+
+ oinfo = sb_dqinfo(sb, type)->dqi_priv;
+ gfe = (struct ocfs2_dinode *)oinfo->dqi_gqi_bh->b_data;
+ lfe = (struct ocfs2_dinode *)oinfo->dqi_lqi_bh->b_data;
+ /* We can extend local file + global file. In local file we
+ * can modify info, chunk header block and dquot block. In
+ * global file we can modify info, tree and leaf block */
+ return ocfs2_calc_extend_credits(sb, &lfe->id2.i_list, 0) +
+ ocfs2_calc_extend_credits(sb, &gfe->id2.i_list, 0) +
+ 3 + oinfo->dqi_gi.dqi_qtree_depth + 2;
+}
+
+static int ocfs2_acquire_dquot(struct dquot *dquot)
+{
+ handle_t *handle;
+ struct ocfs2_mem_dqinfo *oinfo =
+ sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
+ struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
+ int status = 0;
+
+ mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
+ /* We need an exclusive lock, because we're going to update use count
+ * and instantiate possibly new dquot structure */
+ status = ocfs2_lock_global_qf(oinfo, 1);
+ if (status < 0)
+ goto out;
+ handle = ocfs2_start_trans(osb,
+ ocfs2_calc_qinit_credits(dquot->dq_sb, dquot->dq_type));
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ mlog_errno(status);
+ goto out_ilock;
+ }
+ status = dquot_acquire(dquot);
+ ocfs2_commit_trans(osb, handle);
+out_ilock:
+ ocfs2_unlock_global_qf(oinfo, 1);
+out:
+ mlog_exit(status);
+ return status;
+}
+
+static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
+{
+ unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
+ (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
+ (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
+ (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
+ (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
+ (1 << (DQ_LASTSET_B + QIF_ITIME_B));
+ int sync = 0;
+ int status;
+ struct super_block *sb = dquot->dq_sb;
+ int type = dquot->dq_type;
+ struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
+ handle_t *handle;
+ struct ocfs2_super *osb = OCFS2_SB(sb);
+
+ mlog_entry("id=%u, type=%d", dquot->dq_id, type);
+ dquot_mark_dquot_dirty(dquot);
+
+ /* In case user set some limits, sync dquot immediately to global
+ * quota file so that information propagates quicker */
+ spin_lock(&dq_data_lock);
+ if (dquot->dq_flags & mask)
+ sync = 1;
+ spin_unlock(&dq_data_lock);
+ if (!sync) {
+ status = ocfs2_write_dquot(dquot);
+ goto out;
+ }
+ status = ocfs2_lock_global_qf(oinfo, 1);
+ if (status < 0)
+ goto out;
+ handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ mlog_errno(status);
+ goto out_ilock;
+ }
+ status = ocfs2_sync_dquot(dquot);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_trans;
+ }
+ /* Now write updated local dquot structure */
+ status = dquot_commit(dquot);
+out_trans:
+ ocfs2_commit_trans(osb, handle);
+out_ilock:
+ ocfs2_unlock_global_qf(oinfo, 1);
+out:
+ mlog_exit(status);
+ return status;
+}
+
+/* This should happen only after set_dqinfo(). */
+static int ocfs2_write_info(struct super_block *sb, int type)
+{
+ handle_t *handle;
+ int status = 0;
+ struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
+
+ mlog_entry_void();
+
+ status = ocfs2_lock_global_qf(oinfo, 1);
+ if (status < 0)
+ goto out;
+ handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ mlog_errno(status);
+ goto out_ilock;
+ }
+ status = dquot_commit_info(sb, type);
+ ocfs2_commit_trans(OCFS2_SB(sb), handle);
+out_ilock:
+ ocfs2_unlock_global_qf(oinfo, 1);
+out:
+ mlog_exit(status);
+ return status;
+}
+
+/* This is difficult. We have to lock quota inode and start transaction
+ * in this function but we don't want to take the penalty of exlusive
+ * quota file lock when we are just going to use cached structures. So
+ * we just take read lock check whether we have dquot cached and if so,
+ * we don't have to take the write lock... */
+static int ocfs2_dquot_initialize(struct inode *inode, int type)
+{
+ handle_t *handle = NULL;
+ int status = 0;
+ struct super_block *sb = inode->i_sb;
+ struct ocfs2_mem_dqinfo *oinfo;
+ int exclusive = 0;
+ int cnt;
+ qid_t id;
+
+ mlog_entry_void();
+
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (type != -1 && cnt != type)
+ continue;
+ if (!sb_has_quota_active(sb, cnt))
+ continue;
+ oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
+ status = ocfs2_lock_global_qf(oinfo, 0);
+ if (status < 0)
+ goto out;
+ /* This is just a performance optimization not a reliable test.
+ * Since we hold an inode lock, noone can actually release
+ * the structure until we are finished with initialization. */
+ if (inode->i_dquot[cnt] != NODQUOT) {
+ ocfs2_unlock_global_qf(oinfo, 0);
+ continue;
+ }
+ /* When we have inode lock, we know that no dquot_release() can
+ * run and thus we can safely check whether we need to
+ * read+modify global file to get quota information or whether
+ * our node already has it. */
+ if (cnt == USRQUOTA)
+ id = inode->i_uid;
+ else if (cnt == GRPQUOTA)
+ id = inode->i_gid;
+ else
+ BUG();
+ /* Obtain exclusion from quota off... */
+ down_write(&sb_dqopt(sb)->dqptr_sem);
+ exclusive = !dquot_is_cached(sb, id, cnt);
+ up_write(&sb_dqopt(sb)->dqptr_sem);
+ if (exclusive) {
+ status = ocfs2_lock_global_qf(oinfo, 1);
+ if (status < 0) {
+ exclusive = 0;
+ mlog_errno(status);
+ goto out_ilock;
+ }
+ handle = ocfs2_start_trans(OCFS2_SB(sb),
+ ocfs2_calc_qinit_credits(sb, cnt));
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ mlog_errno(status);
+ goto out_ilock;
+ }
+ }
+ dquot_initialize(inode, cnt);
+ if (exclusive) {
+ ocfs2_commit_trans(OCFS2_SB(sb), handle);
+ ocfs2_unlock_global_qf(oinfo, 1);
+ }
+ ocfs2_unlock_global_qf(oinfo, 0);
+ }
+ mlog_exit(0);
+ return 0;
+out_ilock:
+ if (exclusive)
+ ocfs2_unlock_global_qf(oinfo, 1);
+ ocfs2_unlock_global_qf(oinfo, 0);
+out:
+ mlog_exit(status);
+ return status;
+}
+
+static int ocfs2_dquot_drop_slow(struct inode *inode)
+{
+ int status;
+ int cnt;
+ int got_lock[MAXQUOTAS] = {0, 0};
+ handle_t *handle;
+ struct super_block *sb = inode->i_sb;
+ struct ocfs2_mem_dqinfo *oinfo;
+
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (!sb_has_quota_active(sb, cnt))
+ continue;
+ oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
+ status = ocfs2_lock_global_qf(oinfo, 1);
+ if (status < 0)
+ goto out;
+ got_lock[cnt] = 1;
+ }
+ handle = ocfs2_start_trans(OCFS2_SB(sb),
+ ocfs2_calc_qinit_credits(sb, USRQUOTA) +
+ ocfs2_calc_qinit_credits(sb, GRPQUOTA));
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ mlog_errno(status);
+ goto out;
+ }
+ dquot_drop(inode);
+ ocfs2_commit_trans(OCFS2_SB(sb), handle);
+out:
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ if (got_lock[cnt]) {
+ oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
+ ocfs2_unlock_global_qf(oinfo, 1);
+ }
+ return status;
+}
+
+/* See the comment before ocfs2_dquot_initialize. */
+static int ocfs2_dquot_drop(struct inode *inode)
+{
+ int status = 0;
+ struct super_block *sb = inode->i_sb;
+ struct ocfs2_mem_dqinfo *oinfo;
+ int exclusive = 0;
+ int cnt;
+ int got_lock[MAXQUOTAS] = {0, 0};
+
+ mlog_entry_void();
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (!sb_has_quota_active(sb, cnt))
+ continue;
+ oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
+ status = ocfs2_lock_global_qf(oinfo, 0);
+ if (status < 0)
+ goto out;
+ got_lock[cnt] = 1;
+ }
+ /* Lock against anyone releasing references so that when when we check
+ * we know we are not going to be last ones to release dquot */
+ down_write(&sb_dqopt(sb)->dqptr_sem);
+ /* Urgh, this is a terrible hack :( */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (inode->i_dquot[cnt] != NODQUOT &&
+ atomic_read(&inode->i_dquot[cnt]->dq_count) > 1) {
+ exclusive = 1;
+ break;
+ }
+ }
+ if (!exclusive)
+ dquot_drop_locked(inode);
+ up_write(&sb_dqopt(sb)->dqptr_sem);
+out:
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ if (got_lock[cnt]) {
+ oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
+ ocfs2_unlock_global_qf(oinfo, 0);
+ }
+ /* In case we bailed out because we had to do expensive locking
+ * do it now... */
+ if (exclusive)
+ status = ocfs2_dquot_drop_slow(inode);
+ mlog_exit(status);
+ return status;
+}
+
+static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
+{
+ struct ocfs2_dquot *dquot =
+ kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
+
+ if (!dquot)
+ return NULL;
+ return &dquot->dq_dquot;
+}
+
+static void ocfs2_destroy_dquot(struct dquot *dquot)
+{
+ kmem_cache_free(ocfs2_dquot_cachep, dquot);
+}
+
+struct dquot_operations ocfs2_quota_operations = {
+ .initialize = ocfs2_dquot_initialize,
+ .drop = ocfs2_dquot_drop,
+ .alloc_space = dquot_alloc_space,
+ .alloc_inode = dquot_alloc_inode,
+ .free_space = dquot_free_space,
+ .free_inode = dquot_free_inode,
+ .transfer = dquot_transfer,
+ .write_dquot = ocfs2_write_dquot,
+ .acquire_dquot = ocfs2_acquire_dquot,
+ .release_dquot = ocfs2_release_dquot,
+ .mark_dirty = ocfs2_mark_dquot_dirty,
+ .write_info = ocfs2_write_info,
+ .alloc_dquot = ocfs2_alloc_dquot,
+ .destroy_dquot = ocfs2_destroy_dquot,
+};
OpenPOWER on IntegriCloud