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| author |  Christian Brauner <brauner@kernel.org>
| 2024-03-28 13:27:24 +0100 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org>
| 2024-04-07 13:49:02 +0200 |
| commit | 210a03c9d51aa0e6e6f06980116e3256da8d4c48 (patch) | |
| tree | 04084320e97c4e3991b2ea3d36959f5651893e67 /mm | |
| parent | fs: Annotate struct file_handle with __counted_by() and use struct_size() (diff) | |
| download | linux-210a03c9d51aa0e6e6f06980116e3256da8d4c48.tar.gz linux-210a03c9d51aa0e6e6f06980116e3256da8d4c48.tar.bz2 linux-210a03c9d51aa0e6e6f06980116e3256da8d4c48.zip | |
fs: claw back a few FMODE_* bits
There's a bunch of flags that are purely based on what the file
operations support while also never being conditionally set or unset.
IOW, they're not subject to change for individual files. Imho, such
flags don't need to live in f_mode they might as well live in the fops
structs itself. And the fops struct already has that lonely
mmap_supported_flags member. We might as well turn that into a generic
fop_flags member and move a few flags from FMODE_* space into FOP_*
space. That gets us four FMODE_* bits back and the ability for new
static flags that are about file ops to not have to live in FMODE_*
space but in their own FOP_* space. It's not the most beautiful thing
ever but it gets the job done. Yes, there'll be an additional pointer
chase but hopefully that won't matter for these flags.
I suspect there's a few more we can move into there and that we can also
redirect a bunch of new flag suggestions that follow this pattern into
the fop_flags field instead of f_mode.
Link: https://lore.kernel.org/r/20240328-gewendet-spargel-aa60a030ef74@brauner
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mmap.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 6dbda99a47da..3490af70f259 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1294,7 +1294,9 @@ unsigned long do_mmap(struct file *file, unsigned long addr, if (!file_mmap_ok(file, inode, pgoff, len)) return -EOVERFLOW; - flags_mask = LEGACY_MAP_MASK | file->f_op->mmap_supported_flags; + flags_mask = LEGACY_MAP_MASK; + if (file->f_op->fop_flags & FOP_MMAP_SYNC) + flags_mask |= MAP_SYNC; switch (flags & MAP_TYPE) { case MAP_SHARED: |