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authorTahsin Erdogan <tahsin@google.com>2017-07-06 00:01:59 -0400
committerTheodore Ts'o <tytso@mit.edu>2017-07-06 00:01:59 -0400
commitaf65207c76ce8e6263a3b097ea35365dde9913d0 (patch)
tree222298b2f179736a158d83341511cd9c7a81eca0 /fs/crypto
parentad47f9533994d7e3d2dbfa4fffe85934a1627edc (diff)
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ext4: fix __ext4_new_inode() journal credits calculation
ea_inode feature allows creating extended attributes that are up to 64k in size. Update __ext4_new_inode() to pick increased credit limits. To avoid overallocating too many journal credits, update __ext4_xattr_set_credits() to make a distinction between xattr create vs update. This helps __ext4_new_inode() because all attributes are known to be new, so we can save credits that are normally needed to delete old values. Also, have fscrypt specify its maximum context size so that we don't end up allocating credits for 64k size. Signed-off-by: Tahsin Erdogan <tahsin@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/crypto')
-rw-r--r--fs/crypto/policy.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/crypto/policy.c b/fs/crypto/policy.c
index 210976e7a269..94becf5a1519 100644
--- a/fs/crypto/policy.c
+++ b/fs/crypto/policy.c
@@ -260,6 +260,7 @@ int fscrypt_inherit_context(struct inode *parent, struct inode *child,
memcpy(ctx.master_key_descriptor, ci->ci_master_key,
FS_KEY_DESCRIPTOR_SIZE);
get_random_bytes(ctx.nonce, FS_KEY_DERIVATION_NONCE_SIZE);
+ BUILD_BUG_ON(sizeof(ctx) != FSCRYPT_SET_CONTEXT_MAX_SIZE);
res = parent->i_sb->s_cop->set_context(child, &ctx,
sizeof(ctx), fs_data);
if (res)