[PATCH v2] f2fs: support plain user/group quota

From: Chao Yu
Date: Sat Jul 08 2017 - 12:16:06 EST

From: Chao Yu <yuchao0@xxxxxxxxxx>

This patch adds to support plain user/group quota.

Change Note by Jaegeuk Kim.

- Use f2fs page cache for quota files in order to consider garbage collection.
so, quota files are not tolerable for sudden power-cuts, so user needs to do
quotacheck.

- setattr() calls dquot_transfer which will transfer inode->i_blocks.
We can't reclaim that during f2fs_evict_inode(). So, we need to count
node blocks as well in order to match i_blocks with dquot's space.

Note that, Chao wrote a patch to count inode->i_blocks without inode block.
(f2fs: don't count inode block in in-memory inode.i_blocks)

- in f2fs_remount, we need to make RW in prior to dquot_resume.

- handle fault_injection case during f2fs_quota_off_umount

- TODO: Project quota

Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
v2:
- update doc for quota support.
Documentation/filesystems/f2fs.txt | 2 +
fs/f2fs/data.c | 10 +-
fs/f2fs/f2fs.h | 88 +++++++++---
fs/f2fs/file.c | 34 ++++-
fs/f2fs/inode.c | 5 +
fs/f2fs/namei.c | 66 ++++++++-
fs/f2fs/node.c | 9 +-
fs/f2fs/super.c | 280 +++++++++++++++++++++++++++++++++++++
8 files changed, 454 insertions(+), 40 deletions(-)

diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index 8b04a6359530..273ccb26885e 100644
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -162,6 +162,8 @@ mode=%s Control block allocation mode which supports "adaptive"
writes towards main area.
io_bits=%u Set the bit size of write IO requests. It should be set
with "mode=lfs".
+usrquota Enable plain user disk quota accounting.
+grpquota Enable plain group disk quota accounting.

================================================================================
DEBUGFS ENTRIES
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 7dd5fb647d43..251356859476 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -491,14 +491,15 @@ void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr)
int reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
+ int err;

if (!count)
return 0;

if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
return -EPERM;
- if (unlikely(!inc_valid_block_count(sbi, dn->inode, &count)))
- return -ENOSPC;
+ if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
+ return err;

trace_f2fs_reserve_new_blocks(dn->inode, dn->nid,
dn->ofs_in_node, count);
@@ -749,6 +750,7 @@ static int __allocate_data_block(struct dnode_of_data *dn)
struct node_info ni;
pgoff_t fofs;
blkcnt_t count = 1;
+ int err;

if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
return -EPERM;
@@ -757,8 +759,8 @@ static int __allocate_data_block(struct dnode_of_data *dn)
if (dn->data_blkaddr == NEW_ADDR)
goto alloc;

- if (unlikely(!inc_valid_block_count(sbi, dn->inode, &count)))
- return -ENOSPC;
+ if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
+ return err;

alloc:
get_node_info(sbi, dn->nid, &ni);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index ced78035a416..42c39f0bfd88 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -22,6 +22,7 @@
#include <linux/vmalloc.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
+#include <linux/quotaops.h>
#ifdef CONFIG_F2FS_FS_ENCRYPTION
#include <linux/fscrypt_supp.h>
#else
@@ -88,6 +89,8 @@ extern char *fault_name[FAULT_MAX];
#define F2FS_MOUNT_FAULT_INJECTION 0x00010000
#define F2FS_MOUNT_ADAPTIVE 0x00020000
#define F2FS_MOUNT_LFS 0x00040000
+#define F2FS_MOUNT_USRQUOTA 0x00080000
+#define F2FS_MOUNT_GRPQUOTA 0x00100000

#define clear_opt(sbi, option) ((sbi)->mount_opt.opt &= ~F2FS_MOUNT_##option)
#define set_opt(sbi, option) ((sbi)->mount_opt.opt |= F2FS_MOUNT_##option)
@@ -521,6 +524,12 @@ struct f2fs_inode_info {
nid_t i_xattr_nid; /* node id that contains xattrs */
loff_t last_disk_size; /* lastly written file size */

+#ifdef CONFIG_QUOTA
+ struct dquot *i_dquot[MAXQUOTAS];
+
+ /* quota space reservation, managed internally by quota code */
+ qsize_t i_reserved_quota;
+#endif
struct list_head dirty_list; /* dirty list for dirs and files */
struct list_head gdirty_list; /* linked in global dirty list */
struct list_head inmem_pages; /* inmemory pages managed by f2fs */
@@ -1376,17 +1385,23 @@ static inline bool f2fs_has_xattr_block(unsigned int ofs)
return ofs == XATTR_NODE_OFFSET;
}

-static inline void f2fs_i_blocks_write(struct inode *, block_t, bool);
-static inline bool inc_valid_block_count(struct f2fs_sb_info *sbi,
+static inline void f2fs_i_blocks_write(struct inode *, block_t, bool, bool);
+static inline int inc_valid_block_count(struct f2fs_sb_info *sbi,
struct inode *inode, blkcnt_t *count)
{
- blkcnt_t diff;
+ blkcnt_t diff = 0, release = 0;
block_t avail_user_block_count;
+ int ret;
+
+ ret = dquot_reserve_block(inode, *count);
+ if (ret)
+ return ret;

#ifdef CONFIG_F2FS_FAULT_INJECTION
if (time_to_inject(sbi, FAULT_BLOCK)) {
f2fs_show_injection_info(FAULT_BLOCK);
- return false;
+ release = *count;
+ goto enospc;
}
#endif
/*
@@ -1401,17 +1416,24 @@ static inline bool inc_valid_block_count(struct f2fs_sb_info *sbi,
if (unlikely(sbi->total_valid_block_count > avail_user_block_count)) {
diff = sbi->total_valid_block_count - avail_user_block_count;
*count -= diff;
+ release = diff;
sbi->total_valid_block_count = avail_user_block_count;
if (!*count) {
spin_unlock(&sbi->stat_lock);
percpu_counter_sub(&sbi->alloc_valid_block_count, diff);
- return false;
+ goto enospc;
}
}
spin_unlock(&sbi->stat_lock);

- f2fs_i_blocks_write(inode, *count, true);
- return true;
+ if (release)
+ dquot_release_reservation_block(inode, release);
+ f2fs_i_blocks_write(inode, *count, true, true);
+ return 0;
+
+enospc:
+ dquot_release_reservation_block(inode, release);
+ return -ENOSPC;
}

static inline void dec_valid_block_count(struct f2fs_sb_info *sbi,
@@ -1425,7 +1447,7 @@ static inline void dec_valid_block_count(struct f2fs_sb_info *sbi,
f2fs_bug_on(sbi, inode->i_blocks < sectors);
sbi->total_valid_block_count -= (block_t)count;
spin_unlock(&sbi->stat_lock);
- f2fs_i_blocks_write(inode, count, false);
+ f2fs_i_blocks_write(inode, count, false, true);
}

static inline void inc_page_count(struct f2fs_sb_info *sbi, int count_type)
@@ -1554,11 +1576,18 @@ static inline block_t __start_sum_addr(struct f2fs_sb_info *sbi)
return le32_to_cpu(F2FS_CKPT(sbi)->cp_pack_start_sum);
}

-static inline bool inc_valid_node_count(struct f2fs_sb_info *sbi,
+static inline int inc_valid_node_count(struct f2fs_sb_info *sbi,
struct inode *inode, bool is_inode)
{
block_t valid_block_count;
unsigned int valid_node_count;
+ bool quota = inode && !is_inode;
+
+ if (quota) {
+ int ret = dquot_reserve_block(inode, 1);
+ if (ret)
+ return ret;
+ }

spin_lock(&sbi->stat_lock);

@@ -1566,28 +1595,33 @@ static inline bool inc_valid_node_count(struct f2fs_sb_info *sbi,
if (unlikely(valid_block_count + sbi->reserved_blocks >
sbi->user_block_count)) {
spin_unlock(&sbi->stat_lock);
- return false;
+ goto enospc;
}

valid_node_count = sbi->total_valid_node_count + 1;
if (unlikely(valid_node_count > sbi->total_node_count)) {
spin_unlock(&sbi->stat_lock);
- return false;
+ goto enospc;
}

+ sbi->total_valid_node_count++;
+ sbi->total_valid_block_count++;
+ spin_unlock(&sbi->stat_lock);
+
if (inode) {
if (is_inode)
f2fs_mark_inode_dirty_sync(inode, true);
else
- f2fs_i_blocks_write(inode, 1, true);
+ f2fs_i_blocks_write(inode, 1, true, true);
}

- sbi->total_valid_node_count++;
- sbi->total_valid_block_count++;
- spin_unlock(&sbi->stat_lock);
-
percpu_counter_inc(&sbi->alloc_valid_block_count);
- return true;
+ return 0;
+
+enospc:
+ if (quota)
+ dquot_release_reservation_block(inode, 1);
+ return -ENOSPC;
}

static inline void dec_valid_node_count(struct f2fs_sb_info *sbi,
@@ -1599,12 +1633,13 @@ static inline void dec_valid_node_count(struct f2fs_sb_info *sbi,
f2fs_bug_on(sbi, !sbi->total_valid_node_count);
f2fs_bug_on(sbi, !is_inode && !inode->i_blocks);

- if (!is_inode)
- f2fs_i_blocks_write(inode, 1, false);
sbi->total_valid_node_count--;
sbi->total_valid_block_count--;

spin_unlock(&sbi->stat_lock);
+
+ if (!is_inode)
+ f2fs_i_blocks_write(inode, 1, false, true);
}

static inline unsigned int valid_node_count(struct f2fs_sb_info *sbi)
@@ -1879,14 +1914,21 @@ static inline void f2fs_i_links_write(struct inode *inode, bool inc)
}

static inline void f2fs_i_blocks_write(struct inode *inode,
- block_t diff, bool add)
+ block_t diff, bool add, bool claim)
{
bool clean = !is_inode_flag_set(inode, FI_DIRTY_INODE);
bool recover = is_inode_flag_set(inode, FI_AUTO_RECOVER);
- blkcnt_t sectors = diff << F2FS_LOG_SECTORS_PER_BLOCK;

- inode->i_blocks = add ? inode->i_blocks + sectors :
- inode->i_blocks - sectors;
+ /* add = 1, claim = 1 should be dquot_reserve_block in pair */
+ if (add) {
+ if (claim)
+ dquot_claim_block(inode, diff);
+ else
+ dquot_alloc_block_nofail(inode, diff);
+ } else {
+ dquot_free_block(inode, diff);
+ }
+
f2fs_mark_inode_dirty_sync(inode, true);
if (clean || recover)
set_inode_flag(inode, FI_AUTO_RECOVER);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 3f56b27e761b..527c9f36d971 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -442,11 +442,10 @@ static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)

static int f2fs_file_open(struct inode *inode, struct file *filp)
{
- int ret = generic_file_open(inode, filp);
struct dentry *dir;

- if (!ret && f2fs_encrypted_inode(inode)) {
- ret = fscrypt_get_encryption_info(inode);
+ if (f2fs_encrypted_inode(inode)) {
+ int ret = fscrypt_get_encryption_info(inode);
if (ret)
return -EACCES;
if (!fscrypt_has_encryption_key(inode))
@@ -459,7 +458,7 @@ static int f2fs_file_open(struct inode *inode, struct file *filp)
return -EPERM;
}
dput(dir);
- return ret;
+ return dquot_file_open(inode, filp);
}

int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
@@ -710,6 +709,20 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
if (err)
return err;

+ if (is_quota_modification(inode, attr)) {
+ err = dquot_initialize(inode);
+ if (err)
+ return err;
+ }
+ if ((attr->ia_valid & ATTR_UID &&
+ !uid_eq(attr->ia_uid, inode->i_uid)) ||
+ (attr->ia_valid & ATTR_GID &&
+ !gid_eq(attr->ia_gid, inode->i_gid))) {
+ err = dquot_transfer(inode, attr);
+ if (err)
+ return err;
+ }
+
if (attr->ia_valid & ATTR_SIZE) {
if (f2fs_encrypted_inode(inode)) {
err = fscrypt_get_encryption_info(inode);
@@ -996,9 +1009,9 @@ static int __clone_blkaddrs(struct inode *src_inode, struct inode *dst_inode,

if (do_replace[i]) {
f2fs_i_blocks_write(src_inode,
- 1, false);
+ 1, false, false);
f2fs_i_blocks_write(dst_inode,
- 1, true);
+ 1, true, false);
f2fs_replace_block(sbi, &dn, dn.data_blkaddr,
blkaddr[i], ni.version, true, false);

@@ -1523,6 +1536,13 @@ static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)

inode_lock(inode);

+ /* Is it quota file? Do not allow user to mess with it */
+ if (IS_NOQUOTA(inode)) {
+ inode_unlock(inode);
+ ret = -EPERM;
+ goto unlock_out;
+ }
+
flags = f2fs_mask_flags(inode->i_mode, flags);

oldflags = fi->i_flags;
@@ -1542,7 +1562,7 @@ static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
inode->i_ctime = current_time(inode);
f2fs_set_inode_flags(inode);
f2fs_mark_inode_dirty_sync(inode, false);
-
+unlock_out:
inode_unlock(inode);
out:
mnt_drop_write_file(filp);
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index e42a7a8805dc..6cd312a17c69 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -373,6 +373,8 @@ void f2fs_evict_inode(struct inode *inode)
if (inode->i_nlink || is_bad_inode(inode))
goto no_delete;

+ dquot_initialize(inode);
+
remove_ino_entry(sbi, inode->i_ino, APPEND_INO);
remove_ino_entry(sbi, inode->i_ino, UPDATE_INO);

@@ -405,8 +407,11 @@ void f2fs_evict_inode(struct inode *inode)

if (err)
update_inode_page(inode);
+ dquot_free_inode(inode);
sb_end_intwrite(inode->i_sb);
no_delete:
+ dquot_drop(inode);
+
stat_dec_inline_xattr(inode);
stat_dec_inline_dir(inode);
stat_dec_inline_inode(inode);
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index b75dc2f4ad57..760d85223c81 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -15,6 +15,7 @@
#include <linux/ctype.h>
#include <linux/dcache.h>
#include <linux/namei.h>
+#include <linux/quotaops.h>

#include "f2fs.h"
#include "node.h"
@@ -42,6 +43,8 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
}
f2fs_unlock_op(sbi);

+ nid_free = true;
+
inode_init_owner(inode, dir, mode);

inode->i_ino = ino;
@@ -52,10 +55,17 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
err = insert_inode_locked(inode);
if (err) {
err = -EINVAL;
- nid_free = true;
goto fail;
}

+ err = dquot_initialize(inode);
+ if (err)
+ goto fail_drop;
+
+ err = dquot_alloc_inode(inode);
+ if (err)
+ goto fail_drop;
+
/* If the directory encrypted, then we should encrypt the inode. */
if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
f2fs_set_encrypted_inode(inode);
@@ -85,6 +95,16 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
set_inode_flag(inode, FI_FREE_NID);
iput(inode);
return ERR_PTR(err);
+fail_drop:
+ trace_f2fs_new_inode(inode, err);
+ dquot_drop(inode);
+ inode->i_flags |= S_NOQUOTA;
+ if (nid_free)
+ set_inode_flag(inode, FI_FREE_NID);
+ clear_nlink(inode);
+ unlock_new_inode(inode);
+ iput(inode);
+ return ERR_PTR(err);
}

static int is_multimedia_file(const unsigned char *s, const char *sub)
@@ -136,6 +156,10 @@ static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
nid_t ino = 0;
int err;

+ err = dquot_initialize(dir);
+ if (err)
+ return err;
+
inode = f2fs_new_inode(dir, mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
@@ -180,6 +204,10 @@ static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
!fscrypt_has_permitted_context(dir, inode))
return -EPERM;

+ err = dquot_initialize(dir);
+ if (err)
+ return err;
+
f2fs_balance_fs(sbi, true);

inode->i_ctime = current_time(inode);
@@ -347,6 +375,10 @@ static int f2fs_unlink(struct inode *dir, struct dentry *dentry)

trace_f2fs_unlink_enter(dir, dentry);

+ err = dquot_initialize(dir);
+ if (err)
+ return err;
+
de = f2fs_find_entry(dir, &dentry->d_name, &page);
if (!de) {
if (IS_ERR(page))
@@ -413,6 +445,10 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
if (disk_link.len > dir->i_sb->s_blocksize)
return -ENAMETOOLONG;

+ err = dquot_initialize(dir);
+ if (err)
+ return err;
+
inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
if (IS_ERR(inode))
return PTR_ERR(inode);
@@ -500,6 +536,10 @@ static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
struct inode *inode;
int err;

+ err = dquot_initialize(dir);
+ if (err)
+ return err;
+
inode = f2fs_new_inode(dir, S_IFDIR | mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
@@ -548,6 +588,10 @@ static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
struct inode *inode;
int err = 0;

+ err = dquot_initialize(dir);
+ if (err)
+ return err;
+
inode = f2fs_new_inode(dir, mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
@@ -583,6 +627,10 @@ static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
struct inode *inode;
int err;

+ err = dquot_initialize(dir);
+ if (err)
+ return err;
+
inode = f2fs_new_inode(dir, mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
@@ -676,6 +724,14 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
goto out;
}

+ err = dquot_initialize(old_dir);
+ if (err)
+ goto out;
+
+ err = dquot_initialize(new_dir);
+ if (err)
+ goto out;
+
old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
if (!old_entry) {
if (IS_ERR(old_page))
@@ -856,6 +912,14 @@ static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
!fscrypt_has_permitted_context(old_dir, new_inode)))
return -EPERM;

+ err = dquot_initialize(old_dir);
+ if (err)
+ goto out;
+
+ err = dquot_initialize(new_dir);
+ if (err)
+ goto out;
+
old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
if (!old_entry) {
if (IS_ERR(old_page))
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index b9f14ba6441f..3ed2f947f5da 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1040,10 +1040,9 @@ struct page *new_node_page(struct dnode_of_data *dn,
if (!page)
return ERR_PTR(-ENOMEM);

- if (unlikely(!inc_valid_node_count(sbi, dn->inode, !ofs))) {
- err = -ENOSPC;
+ if (unlikely((err = inc_valid_node_count(sbi, dn->inode, !ofs))))
goto fail;
- }
+
#ifdef CONFIG_F2FS_CHECK_FS
get_node_info(sbi, dn->nid, &new_ni);
f2fs_bug_on(sbi, new_ni.blk_addr != NULL_ADDR);
@@ -2210,7 +2209,7 @@ int recover_xattr_data(struct inode *inode, struct page *page, block_t blkaddr)
/* 2: update xattr nid in inode */
remove_free_nid(sbi, new_xnid);
f2fs_i_xnid_write(inode, new_xnid);
- if (unlikely(!inc_valid_node_count(sbi, inode, false)))
+ if (unlikely(inc_valid_node_count(sbi, inode, false)))
f2fs_bug_on(sbi, 1);
update_inode_page(inode);

@@ -2268,7 +2267,7 @@ int recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)
new_ni = old_ni;
new_ni.ino = ino;

- if (unlikely(!inc_valid_node_count(sbi, NULL, true)))
+ if (unlikely(inc_valid_node_count(sbi, NULL, true)))
WARN_ON(1);
set_node_addr(sbi, &new_ni, NEW_ADDR, false);
inc_valid_inode_count(sbi);
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index af472f7968d0..dd92170e0d6d 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -22,6 +22,7 @@
#include <linux/random.h>
#include <linux/exportfs.h>
#include <linux/blkdev.h>
+#include <linux/quotaops.h>
#include <linux/f2fs_fs.h>
#include <linux/sysfs.h>

@@ -106,6 +107,8 @@ enum {
Opt_fault_injection,
Opt_lazytime,
Opt_nolazytime,
+ Opt_usrquota,
+ Opt_grpquota,
Opt_err,
};

@@ -141,6 +144,8 @@ static match_table_t f2fs_tokens = {
{Opt_fault_injection, "fault_injection=%u"},
{Opt_lazytime, "lazytime"},
{Opt_nolazytime, "nolazytime"},
+ {Opt_usrquota, "usrquota"},
+ {Opt_grpquota, "grpquota"},
{Opt_err, NULL},
};

@@ -380,6 +385,20 @@ static int parse_options(struct super_block *sb, char *options)
case Opt_nolazytime:
sb->s_flags &= ~MS_LAZYTIME;
break;
+#ifdef CONFIG_QUOTA
+ case Opt_usrquota:
+ set_opt(sbi, USRQUOTA);
+ break;
+ case Opt_grpquota:
+ set_opt(sbi, GRPQUOTA);
+ break;
+#else
+ case Opt_usrquota:
+ case Opt_grpquota:
+ f2fs_msg(sb, KERN_INFO,
+ "quota operations not supported");
+ break;
+#endif
default:
f2fs_msg(sb, KERN_ERR,
"Unrecognized mount option \"%s\" or missing value",
@@ -421,6 +440,10 @@ static struct inode *f2fs_alloc_inode(struct super_block *sb)
init_rwsem(&fi->dio_rwsem[WRITE]);
init_rwsem(&fi->i_mmap_sem);

+#ifdef CONFIG_QUOTA
+ memset(&fi->i_dquot, 0, sizeof(fi->i_dquot));
+ fi->i_reserved_quota = 0;
+#endif
/* Will be used by directory only */
fi->i_dir_level = F2FS_SB(sb)->dir_level;
return &fi->vfs_inode;
@@ -561,11 +584,14 @@ static void destroy_device_list(struct f2fs_sb_info *sbi)
kfree(sbi->devs);
}

+static void f2fs_quota_off_umount(struct super_block *sb);
static void f2fs_put_super(struct super_block *sb)
{
struct f2fs_sb_info *sbi = F2FS_SB(sb);
int i;

+ f2fs_quota_off_umount(sb);
+
/* prevent remaining shrinker jobs */
mutex_lock(&sbi->umount_mutex);

@@ -782,6 +808,12 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
seq_printf(seq, ",fault_injection=%u",
sbi->fault_info.inject_rate);
#endif
+#ifdef CONFIG_QUOTA
+ if (test_opt(sbi, USRQUOTA))
+ seq_puts(seq, ",usrquota");
+ if (test_opt(sbi, GRPQUOTA))
+ seq_puts(seq, ",grpquota");
+#endif

return 0;
}
@@ -822,6 +854,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
{
struct f2fs_sb_info *sbi = F2FS_SB(sb);
struct f2fs_mount_info org_mount_opt;
+ unsigned long old_sb_flags;
int err, active_logs;
bool need_restart_gc = false;
bool need_stop_gc = false;
@@ -835,6 +868,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
* need to restore them.
*/
org_mount_opt = sbi->mount_opt;
+ old_sb_flags = sb->s_flags;
active_logs = sbi->active_logs;

/* recover superblocks we couldn't write due to previous RO mount */
@@ -860,6 +894,16 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
goto skip;

+ if (!f2fs_readonly(sb) && (*flags & MS_RDONLY)) {
+ err = dquot_suspend(sb, -1);
+ if (err < 0)
+ goto restore_opts;
+ } else {
+ /* dquot_resume needs RW */
+ sb->s_flags &= ~MS_RDONLY;
+ dquot_resume(sb, -1);
+ }
+
/* disallow enable/disable extent_cache dynamically */
if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) {
err = -EINVAL;
@@ -924,12 +968,237 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
restore_opts:
sbi->mount_opt = org_mount_opt;
sbi->active_logs = active_logs;
+ sb->s_flags = old_sb_flags;
#ifdef CONFIG_F2FS_FAULT_INJECTION
sbi->fault_info = ffi;
#endif
return err;
}

+#ifdef CONFIG_QUOTA
+/* Read data from quotafile */
+static ssize_t f2fs_quota_read(struct super_block *sb, int type, char *data,
+ size_t len, loff_t off)
+{
+ struct inode *inode = sb_dqopt(sb)->files[type];
+ struct address_space *mapping = inode->i_mapping;
+ block_t blkidx = F2FS_BYTES_TO_BLK(off);
+ int offset = off & (sb->s_blocksize - 1);
+ int tocopy;
+ size_t toread;
+ loff_t i_size = i_size_read(inode);
+ struct page *page;
+ char *kaddr;
+
+ if (off > i_size)
+ return 0;
+
+ if (off + len > i_size)
+ len = i_size - off;
+ toread = len;
+ while (toread > 0) {
+ tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread);
+repeat:
+ page = read_mapping_page(mapping, blkidx, NULL);
+ if (IS_ERR(page))
+ return PTR_ERR(page);
+
+ lock_page(page);
+
+ if (unlikely(page->mapping != mapping)) {
+ f2fs_put_page(page, 1);
+ goto repeat;
+ }
+ if (unlikely(!PageUptodate(page))) {
+ f2fs_put_page(page, 1);
+ return -EIO;
+ }
+
+ kaddr = kmap_atomic(page);
+ memcpy(data, kaddr + offset, tocopy);
+ kunmap_atomic(kaddr);
+ f2fs_put_page(page, 1);
+
+ offset = 0;
+ toread -= tocopy;
+ data += tocopy;
+ blkidx++;
+ }
+ return len;
+}
+
+/* Write to quotafile */
+static ssize_t f2fs_quota_write(struct super_block *sb, int type,
+ const char *data, size_t len, loff_t off)
+{
+ struct inode *inode = sb_dqopt(sb)->files[type];
+ struct address_space *mapping = inode->i_mapping;
+ const struct address_space_operations *a_ops = mapping->a_ops;
+ int offset = off & (sb->s_blocksize - 1);
+ size_t towrite = len;
+ struct page *page;
+ char *kaddr;
+ int err = 0;
+ int tocopy;
+
+ while (towrite > 0) {
+ tocopy = min_t(unsigned long, sb->s_blocksize - offset,
+ towrite);
+
+ err = a_ops->write_begin(NULL, mapping, off, tocopy, 0,
+ &page, NULL);
+ if (unlikely(err))
+ break;
+
+ kaddr = kmap_atomic(page);
+ memcpy(kaddr + offset, data, tocopy);
+ kunmap_atomic(kaddr);
+ flush_dcache_page(page);
+
+ a_ops->write_end(NULL, mapping, off, tocopy, tocopy,
+ page, NULL);
+ offset = 0;
+ towrite -= tocopy;
+ off += tocopy;
+ data += tocopy;
+ cond_resched();
+ }
+
+ if (len == towrite)
+ return err;
+ inode->i_version++;
+ inode->i_mtime = inode->i_ctime = current_time(inode);
+ f2fs_mark_inode_dirty_sync(inode, false);
+ return len - towrite;
+}
+
+static struct dquot **f2fs_get_dquots(struct inode *inode)
+{
+ return F2FS_I(inode)->i_dquot;
+}
+
+static qsize_t *f2fs_get_reserved_space(struct inode *inode)
+{
+ return &F2FS_I(inode)->i_reserved_quota;
+}
+
+static int f2fs_quota_sync(struct super_block *sb, int type)
+{
+ struct quota_info *dqopt = sb_dqopt(sb);
+ int cnt;
+ int ret;
+
+ ret = dquot_writeback_dquots(sb, type);
+ if (ret)
+ return ret;
+
+ /*
+ * Now when everything is written we can discard the pagecache so
+ * that userspace sees the changes.
+ */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+ if (type != -1 && cnt != type)
+ continue;
+ if (!sb_has_quota_active(sb, cnt))
+ continue;
+
+ ret = filemap_write_and_wait(dqopt->files[cnt]->i_mapping);
+ if (ret)
+ return ret;
+
+ inode_lock(dqopt->files[cnt]);
+ truncate_inode_pages(&dqopt->files[cnt]->i_data, 0);
+ inode_unlock(dqopt->files[cnt]);
+ }
+ return 0;
+}
+
+static int f2fs_quota_on(struct super_block *sb, int type, int format_id,
+ const struct path *path)
+{
+ struct inode *inode;
+ int err;
+
+ err = f2fs_quota_sync(sb, -1);
+ if (err)
+ return err;
+
+ err = dquot_quota_on(sb, type, format_id, path);
+ if (err)
+ return err;
+
+ inode = d_inode(path->dentry);
+
+ inode_lock(inode);
+ F2FS_I(inode)->i_flags |= FS_NOATIME_FL | FS_IMMUTABLE_FL;
+ inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
+ S_NOATIME | S_IMMUTABLE);
+ inode_unlock(inode);
+ f2fs_mark_inode_dirty_sync(inode, false);
+
+ return 0;
+}
+
+static int f2fs_quota_off(struct super_block *sb, int type)
+{
+ struct inode *inode = sb_dqopt(sb)->files[type];
+ int err;
+
+ if (!inode || !igrab(inode))
+ return dquot_quota_off(sb, type);
+
+ f2fs_quota_sync(sb, -1);
+
+ err = dquot_quota_off(sb, type);
+ if (err)
+ goto out_put;
+
+ inode_lock(inode);
+ F2FS_I(inode)->i_flags &= ~(FS_NOATIME_FL | FS_IMMUTABLE_FL);
+ inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
+ inode_unlock(inode);
+ f2fs_mark_inode_dirty_sync(inode, false);
+out_put:
+ iput(inode);
+ return err;
+}
+
+static void f2fs_quota_off_umount(struct super_block *sb)
+{
+ int type;
+
+ for (type = 0; type < MAXQUOTAS; type++)
+ f2fs_quota_off(sb, type);
+}
+
+static const struct dquot_operations f2fs_quota_operations = {
+ .get_reserved_space = f2fs_get_reserved_space,
+ .write_dquot = dquot_commit,
+ .acquire_dquot = dquot_acquire,
+ .release_dquot = dquot_release,
+ .mark_dirty = dquot_mark_dquot_dirty,
+ .write_info = dquot_commit_info,
+ .alloc_dquot = dquot_alloc,
+ .destroy_dquot = dquot_destroy,
+ .get_next_id = dquot_get_next_id,
+};
+
+static const struct quotactl_ops f2fs_quotactl_ops = {
+ .quota_on = f2fs_quota_on,
+ .quota_off = f2fs_quota_off,
+ .quota_sync = f2fs_quota_sync,
+ .get_state = dquot_get_state,
+ .set_info = dquot_set_dqinfo,
+ .get_dqblk = dquot_get_dqblk,
+ .set_dqblk = dquot_set_dqblk,
+ .get_nextdqblk = dquot_get_next_dqblk,
+};
+#else
+static inline void f2fs_quota_off_umount(struct super_block *sb)
+{
+}
+#endif
+
static struct super_operations f2fs_sops = {
.alloc_inode = f2fs_alloc_inode,
.drop_inode = f2fs_drop_inode,
@@ -937,6 +1206,11 @@ static struct super_operations f2fs_sops = {
.write_inode = f2fs_write_inode,
.dirty_inode = f2fs_dirty_inode,
.show_options = f2fs_show_options,
+#ifdef CONFIG_QUOTA
+ .quota_read = f2fs_quota_read,
+ .quota_write = f2fs_quota_write,
+ .get_dquots = f2fs_get_dquots,
+#endif
.evict_inode = f2fs_evict_inode,
.put_super = f2fs_put_super,
.sync_fs = f2fs_sync_fs,
@@ -1679,6 +1953,12 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
sb->s_max_links = F2FS_LINK_MAX;
get_random_bytes(&sbi->s_next_generation, sizeof(u32));

+#ifdef CONFIG_QUOTA
+ sb->dq_op = &f2fs_quota_operations;
+ sb->s_qcop = &f2fs_quotactl_ops;
+ sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
+#endif
+
sb->s_op = &f2fs_sops;
sb->s_cop = &f2fs_cryptops;
sb->s_xattr = f2fs_xattr_handlers;
--
2.13.0.90.g1eb437020