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netfs: Keep track of the actual remote file size

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Provide a place in which to keep track of the actual remote file size in
the netfs context.  This is needed because inode->i_size will be updated as
we buffer writes in the pagecache, but the server file size won't get
updated until we flush them back.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com

Link: https://lore.kernel.org/r/164623013727.3564931.17659955636985232717.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/164678219305.1200972.6459431995188365134.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/164692921865.2099075.5310757978508056134.stgit@warthog.procyon.org.uk/ # v3
This commit is contained in:
David Howells 2021-11-05 13:55:38 +00:00
parent b900f4b89b
commit 4058f74210
1 changed files with 16 additions and 0 deletions
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16
include/linux/netfs.h
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@ -126,6 +126,7 @@ struct netfs_i_context {
#if IS_ENABLED(CONFIG_FSCACHE)
struct fscache_cookie *cache;
#endif
loff_t remote_i_size; /* Size of the remote file */
};
/*
@ -324,6 +325,21 @@ static inline void netfs_i_context_init(struct inode *inode,
memset(ctx, 0, sizeof(*ctx));
ctx->ops = ops;
ctx->remote_i_size = i_size_read(inode);
}
/**
* netfs_resize_file - Note that a file got resized
* @inode: The inode being resized
* @new_i_size: The new file size
*
* Inform the netfs lib that a file got resized so that it can adjust its state.
*/
static inline void netfs_resize_file(struct inode *inode, loff_t new_i_size)
{
struct netfs_i_context *ctx = netfs_i_context(inode);
ctx->remote_i_size = new_i_size;
}
/**