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| author | Theodore Ts'o <tytso@mit.edu> | 2020-01-23 20:23:17 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2020-01-25 05:23:12 +0300 |
| commit | 244adf6426ee31a83f397b700d964cff12a247d3 (patch) | |
| tree | aaf52d4d55384fc1bee1d1debcf889216d0a239d /fs/ext4 | |
| parent | 4068664e3cd2312610ceac05b74c4cf1853b8325 (diff) | |
| download | linux-244adf6426ee31a83f397b700d964cff12a247d3.tar.xz | |
ext4: make dioread_nolock the default
This fixes the direct I/O versus writeback race which can reveal stale
data, and it improves the tail latency of commits on slow devices.
Link: https://lore.kernel.org/r/20200125022254.1101588-1-tytso@mit.edu
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/super.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index ecf36a23e0c4..c6fe742db798 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1592,6 +1592,7 @@ static const match_table_t tokens = { {Opt_auto_da_alloc, "auto_da_alloc"}, {Opt_noauto_da_alloc, "noauto_da_alloc"}, {Opt_dioread_nolock, "dioread_nolock"}, + {Opt_dioread_lock, "nodioread_nolock"}, {Opt_dioread_lock, "dioread_lock"}, {Opt_discard, "discard"}, {Opt_nodiscard, "nodiscard"}, @@ -3764,6 +3765,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) set_opt(sb, NO_UID32); /* xattr user namespace & acls are now defaulted on */ set_opt(sb, XATTR_USER); + set_opt(sb, DIOREAD_NOLOCK); #ifdef CONFIG_EXT4_FS_POSIX_ACL set_opt(sb, POSIX_ACL); #endif @@ -3931,9 +3933,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) #endif if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { - printk_once(KERN_WARNING "EXT4-fs: Warning: mounting " - "with data=journal disables delayed " - "allocation and O_DIRECT support!\n"); + printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, and O_DIRECT support!\n"); + clear_opt(sb, DIOREAD_NOLOCK); if (test_opt2(sb, EXPLICIT_DELALLOC)) { ext4_msg(sb, KERN_ERR, "can't mount with " "both data=journal and delalloc"); |