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Merge branch 'quota_scaling' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Browse Source 
Pull quota scaling updates from Jan Kara:
 "This contains changes to make the quota subsystem more scalable.

  Reportedly it improves number of files created per second on ext4
  filesystem on fast storage by about a factor of 2x"

* 'quota_scaling' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: (28 commits)
  quota: Add lock annotations to struct members
  quota: Reduce contention on dq_data_lock
  fs: Provide __inode_get_bytes()
  quota: Inline dquot_[re]claim_reserved_space() into callsite
  quota: Inline inode_{incr,decr}_space() into callsites
  quota: Inline functions into their callsites
  ext4: Disable dirty list tracking of dquots when journalling quotas
  quota: Allow disabling tracking of dirty dquots in a list
  quota: Remove dq_wait_unused from dquot
  quota: Move locking into clear_dquot_dirty()
  quota: Do not dirty bad dquots
  quota: Fix possible corruption of dqi_flags
  quota: Propagate ->quota_read errors from v2_read_file_info()
  quota: Fix error codes in v2_read_file_info()
  quota: Push dqio_sem down to ->read_file_info()
  quota: Push dqio_sem down to ->write_file_info()
  quota: Push dqio_sem down to ->get_next_id()
  quota: Push dqio_sem down to ->release_dqblk()
  quota: Remove locking for writing to the old quota format
  quota: Do not acquire dqio_sem for dquot overwrites in v2 format
  ...
This commit is contained in:
Linus Torvalds
2017-09-07 15:19:35 -07:00
parent 460352c2f1 6c83fd5142
commit ae8ac6b7db
12 changed files with 413 additions and 330 deletions
Download Patch File Download Diff File Expand all files Collapse all files

95
fs/quota/quota_v2.c
View File

@@ -65,9 +65,11 @@ static int v2_read_header(struct super_block *sb, int type,
if (size != sizeof(struct v2_disk_dqheader)) {
quota_error(sb, "Failed header read: expected=%zd got=%zd",
sizeof(struct v2_disk_dqheader), size);
return 0;
if (size < 0)
return size;
return -EIO;
}
return 1;
return 0;
}
/* Check whether given file is really vfsv0 quotafile */
@@ -77,7 +79,7 @@ static int v2_check_quota_file(struct super_block *sb, int type)
static const uint quota_magics[] = V2_INITQMAGICS;
static const uint quota_versions[] = V2_INITQVERSIONS;
if (!v2_read_header(sb, type, &dqhead))
if (v2_read_header(sb, type, &dqhead))
return 0;
if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] ||
le32_to_cpu(dqhead.dqh_version) > quota_versions[type])
@@ -90,28 +92,39 @@ static int v2_read_file_info(struct super_block *sb, int type)
{
struct v2_disk_dqinfo dinfo;
struct v2_disk_dqheader dqhead;
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct quota_info *dqopt = sb_dqopt(sb);
struct mem_dqinfo *info = &dqopt->info[type];
struct qtree_mem_dqinfo *qinfo;
ssize_t size;
unsigned int version;
int ret;
if (!v2_read_header(sb, type, &dqhead))
return -1;
down_read(&dqopt->dqio_sem);
ret = v2_read_header(sb, type, &dqhead);
if (ret < 0)
goto out;
version = le32_to_cpu(dqhead.dqh_version);
if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) ||
(info->dqi_fmt_id == QFMT_VFS_V1 && version != 1))
return -1;
(info->dqi_fmt_id == QFMT_VFS_V1 && version != 1)) {
ret = -EINVAL;
goto out;
}
size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
if (size != sizeof(struct v2_disk_dqinfo)) {
quota_error(sb, "Can't read info structure");
return -1;
if (size < 0)
ret = size;
else
ret = -EIO;
goto out;
}
info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
if (!info->dqi_priv)
return -ENOMEM;
if (!info->dqi_priv) {
ret = -ENOMEM;
goto out;
}
qinfo = info->dqi_priv;
if (version == 0) {
/* limits are stored as unsigned 32-bit data */
@@ -145,17 +158,22 @@ static int v2_read_file_info(struct super_block *sb, int type)
qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk);
qinfo->dqi_ops = &v2r1_qtree_ops;
}
return 0;
ret = 0;
out:
up_read(&dqopt->dqio_sem);
return ret;
}
/* Write information header to quota file */
static int v2_write_file_info(struct super_block *sb, int type)
{
struct v2_disk_dqinfo dinfo;
struct mem_dqinfo *info = sb_dqinfo(sb, type);
struct quota_info *dqopt = sb_dqopt(sb);
struct mem_dqinfo *info = &dqopt->info[type];
struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
ssize_t size;
down_write(&dqopt->dqio_sem);
spin_lock(&dq_data_lock);
info->dqi_flags &= ~DQF_INFO_DIRTY;
dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
@@ -168,6 +186,7 @@ static int v2_write_file_info(struct super_block *sb, int type)
dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry);
size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
up_write(&dqopt->dqio_sem);
if (size != sizeof(struct v2_disk_dqinfo)) {
quota_error(sb, "Can't write info structure");
return -1;
@@ -283,17 +302,51 @@ static int v2r1_is_id(void *dp, struct dquot *dquot)
static int v2_read_dquot(struct dquot *dquot)
{
return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
int ret;
down_read(&dqopt->dqio_sem);
ret = qtree_read_dquot(
sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
dquot);
up_read(&dqopt->dqio_sem);
return ret;
}
static int v2_write_dquot(struct dquot *dquot)
{
return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
int ret;
bool alloc = false;
/*
* If space for dquot is already allocated, we don't need any
* protection as we'll only overwrite the place of dquot. We are
* still protected by concurrent writes of the same dquot by
* dquot->dq_lock.
*/
if (!dquot->dq_off) {
alloc = true;
down_write(&dqopt->dqio_sem);
}
ret = qtree_write_dquot(
sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
dquot);
if (alloc)
up_write(&dqopt->dqio_sem);
return ret;
}
static int v2_release_dquot(struct dquot *dquot)
{
return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
int ret;
down_write(&dqopt->dqio_sem);
ret = qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
up_write(&dqopt->dqio_sem);
return ret;
}
static int v2_free_file_info(struct super_block *sb, int type)
@@ -304,7 +357,13 @@ static int v2_free_file_info(struct super_block *sb, int type)
static int v2_get_next_id(struct super_block *sb, struct kqid *qid)
{
return qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid);
struct quota_info *dqopt = sb_dqopt(sb);
int ret;
down_read(&dqopt->dqio_sem);
ret = qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid);
up_read(&dqopt->dqio_sem);
return ret;
}
static const struct quota_format_ops v2_format_ops = {