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author | Jens Axboe <axboe@kernel.dk> | 2022-05-24 21:43:10 -0600 |
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committer | Jens Axboe <axboe@kernel.dk> | 2022-07-24 18:39:11 -0600 |
commit | 453b329be5eacfc48dd43035af82bc7f28ecfedf (patch) | |
tree | 072ae9d9fd40554f65537c92cc1e9116b5dfe79f /io_uring/filetable.h | |
parent | f4c163dd7d4b1031772317cd3cd58dd6711ee51e (diff) | |
download | linux-stable-453b329be5eacfc48dd43035af82bc7f28ecfedf.tar.gz linux-stable-453b329be5eacfc48dd43035af82bc7f28ecfedf.tar.bz2 linux-stable-453b329be5eacfc48dd43035af82bc7f28ecfedf.zip |
io_uring: separate out file table handling code
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/filetable.h')
-rw-r--r-- | io_uring/filetable.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/io_uring/filetable.h b/io_uring/filetable.h new file mode 100644 index 000000000000..fe1ec581958d --- /dev/null +++ b/io_uring/filetable.h @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0 +#ifndef IOU_FILE_TABLE_H +#define IOU_FILE_TABLE_H + +struct io_ring_ctx; + +/* + * FFS_SCM is only available on 64-bit archs, for 32-bit we just define it as 0 + * and define IO_URING_SCM_ALL. For this case, we use SCM for all files as we + * can't safely always dereference the file when the task has exited and ring + * cleanup is done. If a file is tracked and part of SCM, then unix gc on + * process exit may reap it before __io_sqe_files_unregister() is run. + */ +#define FFS_NOWAIT 0x1UL +#define FFS_ISREG 0x2UL +#if defined(CONFIG_64BIT) +#define FFS_SCM 0x4UL +#else +#define IO_URING_SCM_ALL +#define FFS_SCM 0x0UL +#endif +#define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG|FFS_SCM) + +struct io_fixed_file { + /* file * with additional FFS_* flags */ + unsigned long file_ptr; +}; + +struct io_file_table { + struct io_fixed_file *files; + unsigned long *bitmap; + unsigned int alloc_hint; +}; + +bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files); +void io_free_file_tables(struct io_file_table *table); +int io_file_bitmap_get(struct io_ring_ctx *ctx); + +static inline void io_file_bitmap_clear(struct io_file_table *table, int bit) +{ + __clear_bit(bit, table->bitmap); + table->alloc_hint = bit; +} + +static inline void io_file_bitmap_set(struct io_file_table *table, int bit) +{ + WARN_ON_ONCE(test_bit(bit, table->bitmap)); + __set_bit(bit, table->bitmap); + table->alloc_hint = bit + 1; +} + +static inline struct io_fixed_file * +io_fixed_file_slot(struct io_file_table *table, unsigned i) +{ + return &table->files[i]; +} + +#endif |