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Retry zfs_znode_alloc() in zfs_mknode()

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For historical reasons zfs_mknode() was written such that it could
never fail.  This poses a problem for Linux since zfs_znode_alloc()
could potentually failure due to low memory.  Handle this gracefully
by retrying zfs_znode_alloc() until it succeeds, direct reclaim
will eventually be able to allocate memory.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: loli10K <ezomori.nozomu@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #5535 
Closes #5908
This commit is contained in:
Brian Behlendorf 2017-03-23 18:26:50 -07:00 committed by GitHub
parent b25c5b0639
commit 8d70398740
1 changed files with 12 additions and 1 deletions
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13
module/zfs/zfs_znode.c
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@ -915,7 +915,18 @@ zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0);
if (!(flag & IS_ROOT_NODE)) {
*zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, obj, sa_hdl);
/*
* The call to zfs_znode_alloc() may fail if memory is low
* via the call path: alloc_inode() -> inode_init_always() ->
* security_inode_alloc() -> inode_alloc_security(). Since
* the existing code is written such that zfs_mknode() can
* not fail retry until sufficient memory has been reclaimed.
*/
do {
*zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, obj,
sa_hdl);
} while (*zpp == NULL);
VERIFY(*zpp != NULL);
VERIFY(dzp != NULL);
} else {