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| author |  Kent Overstreet <kent.overstreet@linux.dev>
| 2023-07-10 20:30:04 -0400 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev>
| 2023-10-22 17:10:07 -0400 |
| commit | f39d1aca4de011949b1b1c636de3146f3b7c1384 (patch) | |
| tree | 46691098043c7c43b70c8341d1c36c3e5f9f74b7 /fs/bcachefs/super-io.c | |
| parent | bcachefs: Fallocate now checks page cache (diff) | |
| download | linux-f39d1aca4de011949b1b1c636de3146f3b7c1384.tar.gz linux-f39d1aca4de011949b1b1c636de3146f3b7c1384.tar.bz2 linux-f39d1aca4de011949b1b1c636de3146f3b7c1384.zip | |
bcachefs: Add buffered IO fallback for userspace
In userspace, we want to be able to switch to buffered IO when we're
dealing with an image on a filesystem/device that doesn't support the
blocksize the filesystem was formatted with.
This plumbs through !opts.direct_io -> FMODE_BUFFERED, which will be
supported by the shim version of blkdev_get_by_path() in -tools, and it
adds a fallback to disable direct IO and retry for userspace.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/super-io.c')
| -rw-r--r-- | fs/bcachefs/super-io.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/fs/bcachefs/super-io.c b/fs/bcachefs/super-io.c index 6ee1e7bb5eba..deef31a617c4 100644 --- a/fs/bcachefs/super-io.c +++ b/fs/bcachefs/super-io.c @@ -662,7 +662,9 @@ int bch2_read_super(const char *path, struct bch_opts *opts, struct printbuf err = PRINTBUF; __le64 *i; int ret; - +#ifndef __KERNEL__ +retry: +#endif memset(sb, 0, sizeof(*sb)); sb->mode = BLK_OPEN_READ; sb->have_bio = true; @@ -670,6 +672,11 @@ int bch2_read_super(const char *path, struct bch_opts *opts, if (!sb->holder) return -ENOMEM; +#ifndef __KERNEL__ + if (opt_get(*opts, direct_io) == false) + sb->mode |= FMODE_BUFFERED; +#endif + if (!opt_get(*opts, noexcl)) sb->mode |= BLK_OPEN_EXCL; @@ -754,7 +761,13 @@ int bch2_read_super(const char *path, struct bch_opts *opts, got_super: if (le16_to_cpu(sb->sb->block_size) << 9 < - bdev_logical_block_size(sb->bdev)) { + bdev_logical_block_size(sb->bdev) && + opt_get(*opts, direct_io)) { +#ifndef __KERNEL__ + opt_set(*opts, direct_io, false); + bch2_free_super(sb); + goto retry; +#endif prt_printf(&err, "block size (%u) smaller than device block size (%u)", le16_to_cpu(sb->sb->block_size) << 9, bdev_logical_block_size(sb->bdev)); |