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author | David Howells <dhowells@redhat.com> | 2021-06-29 22:37:05 +0100 |
---|---|---|
committer | David Howells <dhowells@redhat.com> | 2022-03-18 09:29:05 +0000 |
commit | bc899ee1c898e520574ff4d99356eb2e724a9265 (patch) | |
tree | a3a91c584d50d2e567341b4f9ba6fc0a9f40ec12 /fs/netfs/internal.h | |
parent | a5c9dc4451394b2854493944dcc0ff71af9705a3 (diff) | |
download | linux-stable-bc899ee1c898e520574ff4d99356eb2e724a9265.tar.gz linux-stable-bc899ee1c898e520574ff4d99356eb2e724a9265.tar.bz2 linux-stable-bc899ee1c898e520574ff4d99356eb2e724a9265.zip |
netfs: Add a netfs inode context
Add a netfs_i_context struct that should be included in the network
filesystem's own inode struct wrapper, directly after the VFS's inode
struct, e.g.:
struct my_inode {
struct {
/* These must be contiguous */
struct inode vfs_inode;
struct netfs_i_context netfs_ctx;
};
};
The netfs_i_context struct so far contains a single field for the network
filesystem to use - the cache cookie:
struct netfs_i_context {
...
struct fscache_cookie *cache;
};
Three functions are provided to help with this:
(1) void netfs_i_context_init(struct inode *inode,
const struct netfs_request_ops *ops);
Initialise the netfs context and set the operations.
(2) struct netfs_i_context *netfs_i_context(struct inode *inode);
Find the netfs context from the VFS inode.
(3) struct inode *netfs_inode(struct netfs_i_context *ctx);
Find the VFS inode from the netfs context.
Changes
=======
ver #4)
- Fix netfs_is_cache_enabled() to check cookie->cache_priv to see if a
cache is present[3].
- Fix netfs_skip_folio_read() to zero out all of the page, not just some
of it[3].
ver #3)
- Split out the bit to move ceph cap-getting on readahead into
ceph_init_request()[1].
- Stick in a comment to the netfs inode structs indicating the contiguity
requirements[2].
ver #2)
- Adjust documentation to match.
- Use "#if IS_ENABLED()" in netfs_i_cookie(), not "#ifdef".
- Move the cap check from ceph_readahead() to ceph_init_request() to be
called from netfslib.
- Remove ceph_readahead() and use netfs_readahead() directly instead.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/8af0d47f17d89c06bbf602496dd845f2b0bf25b3.camel@kernel.org/ [1]
Link: https://lore.kernel.org/r/beaf4f6a6c2575ed489adb14b257253c868f9a5c.camel@kernel.org/ [2]
Link: https://lore.kernel.org/r/3536452.1647421585@warthog.procyon.org.uk/ [3]
Link: https://lore.kernel.org/r/164622984545.3564931.15691742939278418580.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/164678213320.1200972.16807551936267647470.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/164692909854.2099075.9535537286264248057.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/306388.1647595110@warthog.procyon.org.uk/ # v4
Diffstat (limited to 'fs/netfs/internal.h')
-rw-r--r-- | fs/netfs/internal.h | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h index 89837e904fa7..54c761bcc8e6 100644 --- a/fs/netfs/internal.h +++ b/fs/netfs/internal.h @@ -6,6 +6,7 @@ */ #include <linux/netfs.h> +#include <linux/fscache.h> #include <trace/events/netfs.h> #ifdef pr_fmt @@ -19,8 +20,6 @@ */ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, struct file *file, - const struct netfs_request_ops *ops, - void *netfs_priv, loff_t start, size_t len, enum netfs_io_origin origin); void netfs_get_request(struct netfs_io_request *rreq, enum netfs_rreq_ref_trace what); @@ -81,6 +80,21 @@ static inline void netfs_stat_d(atomic_t *stat) #define netfs_stat_d(x) do {} while(0) #endif +/* + * Miscellaneous functions. + */ +static inline bool netfs_is_cache_enabled(struct netfs_i_context *ctx) +{ +#if IS_ENABLED(CONFIG_FSCACHE) + struct fscache_cookie *cookie = ctx->cache; + + return fscache_cookie_valid(cookie) && cookie->cache_priv && + fscache_cookie_enabled(cookie); +#else + return false; +#endif +} + /*****************************************************************************/ /* * debug tracing |