Jan Kara 239a1dfaaf ext4: avoid excessive credit estimate in ext4_tmpfile()
[ Upstream commit 35a1f12f0ca857fee1d7a04ef52cbd5f1f84de13 ]

A user with minimum journal size (1024 blocks these days) complained
about the following error triggered by generic/697 test in
ext4_tmpfile():

run fstests generic/697 at 2024-02-28 05:34:46
JBD2: vfstest wants too many credits credits:260 rsv_credits:0 max:256
EXT4-fs error (device loop0) in __ext4_new_inode:1083: error 28

Indeed the credit estimate in ext4_tmpfile() is huge.
EXT4_MAXQUOTAS_INIT_BLOCKS() is 219, then 10 credits from ext4_tmpfile()
itself and then ext4_xattr_credits_for_new_inode() adds more credits
needed for security attributes and ACLs. Now the
EXT4_MAXQUOTAS_INIT_BLOCKS() is in fact unnecessary because we've
already initialized quotas with dquot_init() shortly before and so
EXT4_MAXQUOTAS_TRANS_BLOCKS() is enough (which boils down to 3 credits).

Fixes: af51a2ac36d1 ("ext4: ->tmpfile() support")
Signed-off-by: Jan Kara <jack@suse.cz>
Tested-by: Luis Henriques <lhenriques@suse.de>
Tested-by: Disha Goel <disgoel@linux.ibm.com>
Link: https://lore.kernel.org/r/20240307115320.28949-1-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-06-16 13:39:31 +02:00
..
2024-04-10 16:18:38 +02:00
2024-02-23 08:54:51 +01:00
2021-12-29 12:28:59 +01:00
2024-06-16 13:39:16 +02:00
2023-09-19 12:22:53 +02:00
2024-03-01 13:21:43 +01:00
2023-09-23 11:10:01 +02:00
2023-12-08 08:48:04 +01:00
2023-08-30 16:18:19 +02:00
2024-04-10 16:19:01 +02:00
2022-12-14 11:37:31 +01:00
2023-01-12 11:58:47 +01:00
2022-07-02 16:41:17 +02:00
2022-07-12 16:35:08 +02:00
2021-12-14 10:57:15 +01:00