diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/fuse.h | 14 | ||||
| -rw-r--r-- | include/fuse_common.h | 8 | ||||
| -rw-r--r-- | include/fuse_kernel.h | 3 |
3 files changed, 22 insertions, 3 deletions
diff --git a/include/fuse.h b/include/fuse.h index 6f162dd..3cf0423 100644 --- a/include/fuse.h +++ b/include/fuse.h @@ -274,6 +274,20 @@ struct fuse_config { * fuse_file_info argument is NULL. */ int nullpath_ok; + /** + * Allow parallel direct-io writes to operate on the same file. + * + * FUSE implementations which do not handle parallel writes on + * same file/region should NOT enable this option at all as it + * might lead to data inconsistencies. + * + * For the FUSE implementations which have their own mechanism + * of cache/data integrity are beneficiaries of this setting as + * it now open doors to parallel writes on the same file (without + * enabling this setting, all direct writes on the same file are + * serialized, resulting in huge data bandwidth loss). + */ + int parallel_direct_writes; /** * The remaining options are used by libfuse internally and diff --git a/include/fuse_common.h b/include/fuse_common.h index 06ee365..d2e7fbe 100644 --- a/include/fuse_common.h +++ b/include/fuse_common.h @@ -59,7 +59,7 @@ struct fuse_file_info { requests if write caching had been disabled. */ unsigned int writepage : 1; - /** Can be filled in by open, to use direct I/O on this file. */ + /** Can be filled in by open/create, to use direct I/O on this file. */ unsigned int direct_io : 1; /** Can be filled in by open and opendir. It signals the kernel that any @@ -68,6 +68,10 @@ struct fuse_file_info { the file/directory is closed. */ unsigned int keep_cache : 1; + /** Can be filled by open/create, to allow parallel direct writes on this + * file */ + unsigned int parallel_direct_writes : 1; + /** Indicates a flush operation. Set in flush operation, also maybe set in highlevel lock operation and lowlevel release operation. */ @@ -93,7 +97,7 @@ struct fuse_file_info { unsigned int noflush : 1; /** Padding. Reserved for future use*/ - unsigned int padding : 24; + unsigned int padding : 23; unsigned int padding2 : 32; /** File handle id. May be filled in by filesystem in create, diff --git a/include/fuse_kernel.h b/include/fuse_kernel.h index 39cfb34..814a86f 100644 --- a/include/fuse_kernel.h +++ b/include/fuse_kernel.h @@ -307,6 +307,7 @@ struct fuse_file_lock { * FOPEN_CACHE_DIR: allow caching this directory * FOPEN_STREAM: the file is stream-like (no file position at all) * FOPEN_NOFLUSH: don't flush data cache on close (unless FUSE_WRITEBACK_CACHE) + * FOPEN_PARALLEL_DIRECT_WRITES: allow parallel direct writes on the same file */ #define FOPEN_DIRECT_IO (1 << 0) #define FOPEN_KEEP_CACHE (1 << 1) @@ -314,7 +315,7 @@ struct fuse_file_lock { #define FOPEN_CACHE_DIR (1 << 3) #define FOPEN_STREAM (1 << 4) #define FOPEN_NOFLUSH (1 << 5) - +#define FOPEN_PARALLEL_DIRECT_WRITES (1 << 6) /** * INIT request/reply flags * |