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Subject[37/39] ext4: Convert to generic reserved quotas space management.
2.6.31-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Dmitry Monakhov <dmonakhov@openvz.org>

commit a9e7f4472075fb6937c545af3f6329e9946bbe66 upstream.

This patch also fixes write vs chown race condition.

Acked-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
fs/ext4/ext4.h | 6 +++++-
fs/ext4/inode.c | 16 +++++++---------
fs/ext4/super.c | 5 +++++
3 files changed, 17 insertions(+), 10 deletions(-)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -695,6 +695,10 @@ struct ext4_inode_info {
__u16 i_extra_isize;

spinlock_t i_block_reservation_lock;
+#ifdef CONFIG_QUOTA
+ /* quota space reservation, managed internally by quota code */
+ qsize_t i_reserved_quota;
+#endif

/* completed async DIOs that might need unwritten extents handling */
struct list_head i_aio_dio_complete_list;
@@ -1439,7 +1443,7 @@ extern int ext4_chunk_trans_blocks(struc
extern int ext4_block_truncate_page(handle_t *handle,
struct address_space *mapping, loff_t from);
extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
-extern qsize_t ext4_get_reserved_space(struct inode *inode);
+extern qsize_t *ext4_get_reserved_space(struct inode *inode);
extern int flush_aio_dio_completed_IO(struct inode *inode);
/* ioctl.c */
extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1046,17 +1046,12 @@ out:
return err;
}

-qsize_t ext4_get_reserved_space(struct inode *inode)
+#ifdef CONFIG_QUOTA
+qsize_t *ext4_get_reserved_space(struct inode *inode)
{
- unsigned long long total;
-
- spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
- total = EXT4_I(inode)->i_reserved_data_blocks +
- EXT4_I(inode)->i_reserved_meta_blocks;
- spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
-
- return (total << inode->i_blkbits);
+ return &EXT4_I(inode)->i_reserved_quota;
}
+#endif
/*
* Calculate the number of metadata blocks need to reserve
* to allocate @blocks for non extent file based file
@@ -4840,6 +4835,9 @@ struct inode *ext4_iget(struct super_blo
((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32;
inode->i_size = ext4_isize(raw_inode);
ei->i_disksize = inode->i_size;
+#ifdef CONFIG_QUOTA
+ ei->i_reserved_quota = 0;
+#endif
inode->i_generation = le32_to_cpu(raw_inode->i_generation);
ei->i_block_group = iloc.block_group;
ei->i_last_alloc_group = ~0;
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -711,6 +711,9 @@ static struct inode *ext4_alloc_inode(st
ei->i_allocated_meta_blocks = 0;
ei->i_delalloc_reserved_flag = 0;
spin_lock_init(&(ei->i_block_reservation_lock));
+#ifdef CONFIG_QUOTA
+ ei->i_reserved_quota = 0;
+#endif
INIT_LIST_HEAD(&ei->i_aio_dio_complete_list);
ei->cur_aio_dio = NULL;
ei->i_sync_tid = 0;
@@ -1008,7 +1011,9 @@ static struct dquot_operations ext4_quot
.reserve_space = dquot_reserve_space,
.claim_space = dquot_claim_space,
.release_rsv = dquot_release_reserved_space,
+#ifdef CONFIG_QUOTA
.get_reserved_space = ext4_get_reserved_space,
+#endif
.alloc_inode = dquot_alloc_inode,
.free_space = dquot_free_space,
.free_inode = dquot_free_inode,



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