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-rw-r--r--Documentation/filesystems/erofs.rst3
-rw-r--r--fs/erofs/data.c42
-rw-r--r--fs/erofs/inode.c4
-rw-r--r--fs/erofs/internal.h3
-rw-r--r--fs/erofs/super.c59
5 files changed, 107 insertions, 4 deletions
diff --git a/Documentation/filesystems/erofs.rst b/Documentation/filesystems/erofs.rst
index 832839fcf4c3..868e3972227f 100644
--- a/Documentation/filesystems/erofs.rst
+++ b/Documentation/filesystems/erofs.rst
@@ -84,6 +84,9 @@ cache_strategy=%s Select a strategy for cached decompression from now on:
It still does in-place I/O decompression
for the rest compressed physical clusters.
========== =============================================
+dax={always,never} Use direct access (no page cache). See
+ Documentation/filesystems/dax.rst.
+dax A legacy option which is an alias for ``dax=always``.
=================== =========================================================
On-disk details
diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index 4158572c9e1e..fb2e554c861b 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -6,7 +6,7 @@
#include "internal.h"
#include <linux/prefetch.h>
#include <linux/iomap.h>
-
+#include <linux/dax.h>
#include <trace/events/erofs.h>
static void erofs_readendio(struct bio *bio)
@@ -323,6 +323,7 @@ static int erofs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
return ret;
iomap->bdev = inode->i_sb->s_bdev;
+ iomap->dax_dev = EROFS_I_SB(inode)->dax_dev;
iomap->offset = map.m_la;
iomap->length = map.m_llen;
iomap->flags = 0;
@@ -382,6 +383,10 @@ static ssize_t erofs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
if (!iov_iter_count(to))
return 0;
+#ifdef CONFIG_FS_DAX
+ if (IS_DAX(iocb->ki_filp->f_mapping->host))
+ return dax_iomap_rw(iocb, to, &erofs_iomap_ops);
+#endif
if (iocb->ki_flags & IOCB_DIRECT) {
int err = erofs_prepare_dio(iocb, to);
@@ -402,9 +407,42 @@ const struct address_space_operations erofs_raw_access_aops = {
.direct_IO = noop_direct_IO,
};
+#ifdef CONFIG_FS_DAX
+static vm_fault_t erofs_dax_huge_fault(struct vm_fault *vmf,
+ enum page_entry_size pe_size)
+{
+ return dax_iomap_fault(vmf, pe_size, NULL, NULL, &erofs_iomap_ops);
+}
+
+static vm_fault_t erofs_dax_fault(struct vm_fault *vmf)
+{
+ return erofs_dax_huge_fault(vmf, PE_SIZE_PTE);
+}
+
+static const struct vm_operations_struct erofs_dax_vm_ops = {
+ .fault = erofs_dax_fault,
+ .huge_fault = erofs_dax_huge_fault,
+};
+
+static int erofs_file_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ if (!IS_DAX(file_inode(file)))
+ return generic_file_readonly_mmap(file, vma);
+
+ if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE))
+ return -EINVAL;
+
+ vma->vm_ops = &erofs_dax_vm_ops;
+ vma->vm_flags |= VM_HUGEPAGE;
+ return 0;
+}
+#else
+#define erofs_file_mmap generic_file_readonly_mmap
+#endif
+
const struct file_operations erofs_file_fops = {
.llseek = generic_file_llseek,
.read_iter = erofs_file_read_iter,
- .mmap = generic_file_readonly_mmap,
+ .mmap = erofs_file_mmap,
.splice_read = generic_file_splice_read,
};
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index f296e1a2661e..92728da1d206 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -174,6 +174,10 @@ static struct page *erofs_read_inode(struct inode *inode,
inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec;
inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec;
+ inode->i_flags &= ~S_DAX;
+ if (test_opt(&sbi->ctx, DAX_ALWAYS) && S_ISREG(inode->i_mode) &&
+ vi->datalayout == EROFS_INODE_FLAT_PLAIN)
+ inode->i_flags |= S_DAX;
if (!nblks)
/* measure inode.i_blocks as generic filesystems */
inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9;
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 2669c785d548..7c9abfc93109 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -83,6 +83,7 @@ struct erofs_sb_info {
struct erofs_sb_lz4_info lz4;
#endif /* CONFIG_EROFS_FS_ZIP */
+ struct dax_device *dax_dev;
u32 blocks;
u32 meta_blkaddr;
#ifdef CONFIG_EROFS_FS_XATTR
@@ -115,6 +116,8 @@ struct erofs_sb_info {
/* Mount flags set via mount options or defaults */
#define EROFS_MOUNT_XATTR_USER 0x00000010
#define EROFS_MOUNT_POSIX_ACL 0x00000020
+#define EROFS_MOUNT_DAX_ALWAYS 0x00000040
+#define EROFS_MOUNT_DAX_NEVER 0x00000080
#define clear_opt(ctx, option) ((ctx)->mount_opt &= ~EROFS_MOUNT_##option)
#define set_opt(ctx, option) ((ctx)->mount_opt |= EROFS_MOUNT_##option)
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 8fc6c04b54f4..e8de689c94f4 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -11,6 +11,7 @@
#include <linux/crc32c.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
+#include <linux/dax.h>
#include "xattr.h"
#define CREATE_TRACE_POINTS
@@ -355,6 +356,8 @@ enum {
Opt_user_xattr,
Opt_acl,
Opt_cache_strategy,
+ Opt_dax,
+ Opt_dax_enum,
Opt_err
};
@@ -365,14 +368,47 @@ static const struct constant_table erofs_param_cache_strategy[] = {
{}
};
+static const struct constant_table erofs_dax_param_enums[] = {
+ {"always", EROFS_MOUNT_DAX_ALWAYS},
+ {"never", EROFS_MOUNT_DAX_NEVER},
+ {}
+};
+
static const struct fs_parameter_spec erofs_fs_parameters[] = {
fsparam_flag_no("user_xattr", Opt_user_xattr),
fsparam_flag_no("acl", Opt_acl),
fsparam_enum("cache_strategy", Opt_cache_strategy,
erofs_param_cache_strategy),
+ fsparam_flag("dax", Opt_dax),
+ fsparam_enum("dax", Opt_dax_enum, erofs_dax_param_enums),
{}
};
+static bool erofs_fc_set_dax_mode(struct fs_context *fc, unsigned int mode)
+{
+#ifdef CONFIG_FS_DAX
+ struct erofs_fs_context *ctx = fc->fs_private;
+
+ switch (mode) {
+ case EROFS_MOUNT_DAX_ALWAYS:
+ warnfc(fc, "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
+ set_opt(ctx, DAX_ALWAYS);
+ clear_opt(ctx, DAX_NEVER);
+ return true;
+ case EROFS_MOUNT_DAX_NEVER:
+ set_opt(ctx, DAX_NEVER);
+ clear_opt(ctx, DAX_ALWAYS);
+ return true;
+ default:
+ DBG_BUGON(1);
+ return false;
+ }
+#else
+ errorfc(fc, "dax options not supported");
+ return false;
+#endif
+}
+
static int erofs_fc_parse_param(struct fs_context *fc,
struct fs_parameter *param)
{
@@ -412,6 +448,14 @@ static int erofs_fc_parse_param(struct fs_context *fc,
errorfc(fc, "compression not supported, cache_strategy ignored");
#endif
break;
+ case Opt_dax:
+ if (!erofs_fc_set_dax_mode(fc, EROFS_MOUNT_DAX_ALWAYS))
+ return -EINVAL;
+ break;
+ case Opt_dax_enum:
+ if (!erofs_fc_set_dax_mode(fc, result.uint_32))
+ return -EINVAL;
+ break;
default:
return -ENOPARAM;
}
@@ -496,10 +540,16 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
return -ENOMEM;
sb->s_fs_info = sbi;
+ sbi->dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
err = erofs_read_superblock(sb);
if (err)
return err;
+ if (test_opt(ctx, DAX_ALWAYS) &&
+ !bdev_dax_supported(sb->s_bdev, EROFS_BLKSIZ)) {
+ errorfc(fc, "DAX unsupported by block device. Turning off DAX.");
+ clear_opt(ctx, DAX_ALWAYS);
+ }
sb->s_flags |= SB_RDONLY | SB_NOATIME;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_time_gran = 1;
@@ -609,6 +659,7 @@ static void erofs_kill_sb(struct super_block *sb)
sbi = EROFS_SB(sb);
if (!sbi)
return;
+ fs_put_dax(sbi->dax_dev);
kfree(sbi);
sb->s_fs_info = NULL;
}
@@ -711,8 +762,8 @@ static int erofs_statfs(struct dentry *dentry, struct kstatfs *buf)
static int erofs_show_options(struct seq_file *seq, struct dentry *root)
{
- struct erofs_sb_info *sbi __maybe_unused = EROFS_SB(root->d_sb);
- struct erofs_fs_context *ctx __maybe_unused = &sbi->ctx;
+ struct erofs_sb_info *sbi = EROFS_SB(root->d_sb);
+ struct erofs_fs_context *ctx = &sbi->ctx;
#ifdef CONFIG_EROFS_FS_XATTR
if (test_opt(ctx, XATTR_USER))
@@ -734,6 +785,10 @@ static int erofs_show_options(struct seq_file *seq, struct dentry *root)
else if (ctx->cache_strategy == EROFS_ZIP_CACHE_READAROUND)
seq_puts(seq, ",cache_strategy=readaround");
#endif
+ if (test_opt(ctx, DAX_ALWAYS))
+ seq_puts(seq, ",dax=always");
+ if (test_opt(ctx, DAX_NEVER))
+ seq_puts(seq, ",dax=never");
return 0;
}
generated by cgit (git 2.34.1) at 2024-06-26 23:53:41 +0000