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Commit 1db91382 authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Theodore Ts'o
Browse files

ext4: Handle -EDQUOT error on write 



We need to release the journal before we do a write_inode.  Otherwise
we could deadlock.

Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
parent 74d2e4f8

fs/ext4/inode.c

+18 −14
Original line number Diff line number Diff line
@@ -1835,24 +1835,12 @@ static int ext4_da_reserve_space(struct inode *inode, sector_t lblock) 
	 * later. Real quota accounting is done at pages writeout

	 * time.

	 */

	if (vfs_dq_reserve_block(inode, md_needed + 1)) {

		/* 

		 * We tend to badly over-estimate the amount of

		 * metadata blocks which are needed, so if we have

		 * reserved any metadata blocks, try to force out the

		 * inode and see if we have any better luck.

		 */

		if (md_reserved && retries++ <= 3)

			goto retry;

	if (vfs_dq_reserve_block(inode, md_needed + 1))

		return -EDQUOT;

	}



	if (ext4_claim_free_blocks(sbi, md_needed + 1)) {

		vfs_dq_release_reservation_block(inode, md_needed + 1);

		if (ext4_should_retry_alloc(inode->i_sb, &retries)) {

		retry:

			if (md_reserved)

				write_inode_now(inode, (retries == 3));

			yield();

			goto repeat;

		}
@@ -3032,7 +3020,7 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping, 
			       loff_t pos, unsigned len, unsigned flags,

			       struct page **pagep, void **fsdata)

{

	int ret, retries = 0;

	int ret, retries = 0, quota_retries = 0;

	struct page *page;

	pgoff_t index;

	unsigned from, to;
@@ -3091,6 +3079,22 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping, 


	if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))

		goto retry;



	if ((ret == -EDQUOT) &&

	    EXT4_I(inode)->i_reserved_meta_blocks &&

	    (quota_retries++ < 3)) {

		/*

		 * Since we often over-estimate the number of meta

		 * data blocks required, we may sometimes get a

		 * spurios out of quota error even though there would

		 * be enough space once we write the data blocks and

		 * find out how many meta data blocks were _really_

		 * required.  So try forcing the inode write to see if

		 * that helps.

		 */

		write_inode_now(inode, (quota_retries == 3));

		goto retry;

	}

out:

	return ret;

}