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author | Christian Brauner <brauner@kernel.org> | 2024-02-08 18:47:35 +0100 |
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committer | Christian Brauner <brauner@kernel.org> | 2024-02-25 12:05:21 +0100 |
commit | f3a608827d1f8de0dd12813e8d9c6803fe64e119 (patch) | |
tree | 7072a00135288537c56348d8abf4ada7cd5fac7d /fs/jfs | |
parent | file: add alloc_file_pseudo_noaccount() (diff) | |
download | linux-f3a608827d1f8de0dd12813e8d9c6803fe64e119.tar.xz linux-f3a608827d1f8de0dd12813e8d9c6803fe64e119.zip |
bdev: open block device as files
Add two new helpers to allow opening block devices as files.
This is not the final infrastructure. This still opens the block device
before opening a struct a file. Until we have removed all references to
struct bdev_handle we can't switch the order:
* Introduce blk_to_file_flags() to translate from block specific to
flags usable to pen a new file.
* Introduce bdev_file_open_by_{dev,path}().
* Introduce temporary sb_bdev_handle() helper to retrieve a struct
bdev_handle from a block device file and update places that directly
reference struct bdev_handle to rely on it.
* Don't count block device openes against the number of open files. A
bdev_file_open_by_{dev,path}() file is never installed into any
file descriptor table.
One idea that came to mind was to use kernel_tmpfile_open() which
would require us to pass a path and it would then call do_dentry_open()
going through the regular fops->open::blkdev_open() path. But then we're
back to the problem of routing block specific flags such as
BLK_OPEN_RESTRICT_WRITES through the open path and would have to waste
FMODE_* flags every time we add a new one. With this we can avoid using
a flag bit and we have more leeway in how we open block devices from
bdev_open_by_{dev,path}().
Link: https://lore.kernel.org/r/20240123-vfs-bdev-file-v2-1-adbd023e19cc@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/jfs')
-rw-r--r-- | fs/jfs/jfs_logmgr.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/jfs/jfs_logmgr.c b/fs/jfs/jfs_logmgr.c index cb6d1fda66a7..8691463956d1 100644 --- a/fs/jfs/jfs_logmgr.c +++ b/fs/jfs/jfs_logmgr.c @@ -1162,7 +1162,7 @@ static int open_inline_log(struct super_block *sb) init_waitqueue_head(&log->syncwait); set_bit(log_INLINELOG, &log->flag); - log->bdev_handle = sb->s_bdev_handle; + log->bdev_handle = sb_bdev_handle(sb); log->base = addressPXD(&JFS_SBI(sb)->logpxd); log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >> (L2LOGPSIZE - sb->s_blocksize_bits); |