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Enable ext4 support for per-file/directory dax operations

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This adds the same per-file/per-directory DAX support for ext4 as was
done for xfs, now that we finally have consensus over what the
interface should be.
This commit is contained in:
Theodore Ts'o
2020-06-11 10:51:44 -04:00
parent 6b8ed62008 15ee65676f
commit 68cd44920d
18 changed files with 350 additions and 60 deletions
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85
fs/ext4/super.c
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@@ -1323,6 +1323,9 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
return -EINVAL;
if (ext4_test_inode_flag(inode, EXT4_INODE_DAX))
return -EOPNOTSUPP;
res = ext4_convert_inline_data(inode);
if (res)
return res;
@@ -1348,7 +1351,7 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
* Update inode->i_flags - S_ENCRYPTED will be enabled,
* S_DAX may be disabled
*/
ext4_set_inode_flags(inode);
ext4_set_inode_flags(inode, false);
}
return res;
}
@@ -1375,7 +1378,7 @@ retry:
* Update inode->i_flags - S_ENCRYPTED will be enabled,
* S_DAX may be disabled
*/
ext4_set_inode_flags(inode);
ext4_set_inode_flags(inode, false);
res = ext4_mark_inode_dirty(handle, inode);
if (res)
EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
@@ -1512,7 +1515,8 @@ enum {
Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version,
Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never,
Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
Opt_nowarn_on_error, Opt_mblk_io_submit,
Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
@@ -1579,6 +1583,9 @@ static const match_table_t tokens = {
{Opt_nobarrier, "nobarrier"},
{Opt_i_version, "i_version"},
{Opt_dax, "dax"},
{Opt_dax_always, "dax=always"},
{Opt_dax_inode, "dax=inode"},
{Opt_dax_never, "dax=never"},
{Opt_stripe, "stripe=%u"},
{Opt_delalloc, "delalloc"},
{Opt_warn_on_error, "warn_on_error"},
@@ -1726,6 +1733,7 @@ static int clear_qf_name(struct super_block *sb, int qtype)
#define MOPT_NO_EXT3 0x0200
#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
#define MOPT_STRING 0x0400
#define MOPT_SKIP 0x0800
static const struct mount_opts {
int token;
@@ -1775,7 +1783,13 @@ static const struct mount_opts {
{Opt_min_batch_time, 0, MOPT_GTE0},
{Opt_inode_readahead_blks, 0, MOPT_GTE0},
{Opt_init_itable, 0, MOPT_GTE0},
{Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
{Opt_dax, EXT4_MOUNT_DAX_ALWAYS, MOPT_SET | MOPT_SKIP},
{Opt_dax_always, EXT4_MOUNT_DAX_ALWAYS,
MOPT_EXT4_ONLY | MOPT_SET | MOPT_SKIP},
{Opt_dax_inode, EXT4_MOUNT2_DAX_INODE,
MOPT_EXT4_ONLY | MOPT_SET | MOPT_SKIP},
{Opt_dax_never, EXT4_MOUNT2_DAX_NEVER,
MOPT_EXT4_ONLY | MOPT_SET | MOPT_SKIP},
{Opt_stripe, 0, MOPT_GTE0},
{Opt_resuid, 0, MOPT_GTE0},
{Opt_resgid, 0, MOPT_GTE0},
@@ -2084,13 +2098,32 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
}
sbi->s_jquota_fmt = m->mount_opt;
#endif
} else if (token == Opt_dax) {
} else if (token == Opt_dax || token == Opt_dax_always ||
token == Opt_dax_inode || token == Opt_dax_never) {
#ifdef CONFIG_FS_DAX
ext4_msg(sb, KERN_WARNING,
"DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
sbi->s_mount_opt |= m->mount_opt;
switch (token) {
case Opt_dax:
case Opt_dax_always:
ext4_msg(sb, KERN_WARNING,
"DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
sbi->s_mount_opt |= EXT4_MOUNT_DAX_ALWAYS;
sbi->s_mount_opt2 &= ~EXT4_MOUNT2_DAX_NEVER;
break;
case Opt_dax_never:
sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_NEVER;
sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS;
break;
case Opt_dax_inode:
sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS;
sbi->s_mount_opt2 &= ~EXT4_MOUNT2_DAX_NEVER;
/* Strictly for printing options */
sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_INODE;
break;
}
#else
ext4_msg(sb, KERN_INFO, "dax option not supported");
sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_NEVER;
sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS;
return -1;
#endif
} else if (token == Opt_data_err_abort) {
@@ -2254,7 +2287,7 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
for (m = ext4_mount_opts; m->token != Opt_err; m++) {
int want_set = m->flags & MOPT_SET;
if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
(m->flags & MOPT_CLEAR_ERR))
(m->flags & MOPT_CLEAR_ERR) || m->flags & MOPT_SKIP)
continue;
if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
continue; /* skip if same as the default */
@@ -2314,6 +2347,17 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
if (DUMMY_ENCRYPTION_ENABLED(sbi))
SEQ_OPTS_PUTS("test_dummy_encryption");
if (test_opt(sb, DAX_ALWAYS)) {
if (IS_EXT2_SB(sb))
SEQ_OPTS_PUTS("dax");
else
SEQ_OPTS_PUTS("dax=always");
} else if (test_opt2(sb, DAX_NEVER)) {
SEQ_OPTS_PUTS("dax=never");
} else if (test_opt2(sb, DAX_INODE)) {
SEQ_OPTS_PUTS("dax=inode");
}
ext4_show_quota_options(seq, sb);
return 0;
}
@@ -3978,7 +4022,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
"both data=journal and delalloc");
goto failed_mount;
}
if (test_opt(sb, DAX)) {
if (test_opt(sb, DAX_ALWAYS)) {
ext4_msg(sb, KERN_ERR, "can't mount with "
"both data=journal and dax");
goto failed_mount;
@@ -4088,13 +4132,16 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
goto failed_mount;
}
if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
if (bdev_dax_supported(sb->s_bdev, blocksize))
set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags);
if (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) {
if (ext4_has_feature_inline_data(sb)) {
ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
" that may contain inline data");
goto failed_mount;
}
if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags)) {
ext4_msg(sb, KERN_ERR,
"DAX unsupported by block device.");
goto failed_mount;
@@ -5407,7 +5454,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
err = -EINVAL;
goto restore_opts;
}
if (test_opt(sb, DAX)) {
if (test_opt(sb, DAX_ALWAYS)) {
ext4_msg(sb, KERN_ERR, "can't mount with "
"both data=journal and dax");
err = -EINVAL;
@@ -5428,10 +5475,16 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
goto restore_opts;
}
if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX_ALWAYS ||
(sbi->s_mount_opt2 ^ old_opts.s_mount_opt2) & EXT4_MOUNT2_DAX_NEVER ||
(sbi->s_mount_opt2 ^ old_opts.s_mount_opt2) & EXT4_MOUNT2_DAX_INODE) {
ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
"dax flag with busy inodes while remounting");
sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
"dax mount option with busy inodes while remounting");
sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS;
sbi->s_mount_opt |= old_opts.s_mount_opt & EXT4_MOUNT_DAX_ALWAYS;
sbi->s_mount_opt2 &= ~(EXT4_MOUNT2_DAX_NEVER | EXT4_MOUNT2_DAX_INODE);
sbi->s_mount_opt2 |= old_opts.s_mount_opt2 &
(EXT4_MOUNT2_DAX_NEVER | EXT4_MOUNT2_DAX_INODE);
}
if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)