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fuse: fuse: add time_gran to INIT_OUT
Allow userspace fs to specify time granularity. This is needed because with writeback_cache mode the kernel is responsible for generating mtime and ctime, but if the underlying filesystem doesn't support nanosecond granularity then the cache will contain a different value from the one stored on the filesystem resulting in a change of times after a cache flush. Make the default granularity 1s. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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2 changed files with 12 additions and 0 deletions
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@ -891,6 +891,11 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
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fc->async_dio = 1;
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if (arg->flags & FUSE_WRITEBACK_CACHE)
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fc->writeback_cache = 1;
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if (arg->time_gran && arg->time_gran <= 1000000000)
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fc->sb->s_time_gran = arg->time_gran;
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else
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fc->sb->s_time_gran = 1000000000;
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} else {
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ra_pages = fc->max_read / PAGE_CACHE_SIZE;
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fc->no_lock = 1;
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@ -96,6 +96,8 @@
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*
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* 7.23
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* - add FUSE_WRITEBACK_CACHE
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* - add time_gran to fuse_init_out
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* - add reserved space to fuse_init_out
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*/
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#ifndef _LINUX_FUSE_H
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@ -559,6 +561,9 @@ struct fuse_init_in {
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uint32_t flags;
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};
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#define FUSE_COMPAT_INIT_OUT_SIZE 8
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#define FUSE_COMPAT_22_INIT_OUT_SIZE 24
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struct fuse_init_out {
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uint32_t major;
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uint32_t minor;
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@ -567,6 +572,8 @@ struct fuse_init_out {
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uint16_t max_background;
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uint16_t congestion_threshold;
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uint32_t max_write;
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uint32_t time_gran;
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uint32_t unused[9];
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};
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#define CUSE_INIT_INFO_MAX 4096
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