diff options
| author | Tom Haynes <loghyr@hammerspace.com> | 2026-07-27 17:09:38 -0400 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2026-08-17 09:02:07 -0700 |
| commit | 86ff1842795b3e51f526460b1d701d48fdee49b8 (patch) | |
| tree | bd3c805b4c914353b72bdb0e942ed5dd90f27d5c /include/linux | |
| parent | 4a013b0e881e0466cc2c6a5518d2f6cda3a4f19f (diff) | |
nfs4.2: add UNCACHEABLE_FILE_DATA attribute support
Recognize the NFSv4.2 per-file UNCACHEABLE_FILE_DATA attribute (attr 87,
draft-ietf-nfsv4-uncacheable-files): decode it via GETATTR, track per-
exported-filesystem support, and record on the inode whether a regular
file's data must not be cached. Acting on the attribute (opening such
files O_DIRECT) is done by a subsequent change.
If the NFSv4 server reports a regular file's UNCACHEABLE_FILE_DATA as
true, it indicates the file's data must not be cached; the client records
this in NFS_I(inode)->uncacheable_file_data for use by the I/O paths.
The UNCACHEABLE_FILE_DATA attribute applies only to regular files
(NF4REG); per the draft a server MUST reject a query of it on any other
object type with NFS4ERR_INVAL. A subsequent commit gates the client
accordingly.
Link: https://datatracker.ietf.org/doc/draft-ietf-nfsv4-uncacheable-files/
Signed-off-by: Tom Haynes <loghyr@hammerspace.com>
[snitzer: adapt Tom's original code focused on metadata for ABE]
Co-developed-by: Mike Snitzer <snitzer@hammerspace.com>
Signed-off-by: Mike Snitzer <snitzer@hammerspace.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/nfs4.h | 9 | ||||
| -rw-r--r-- | include/linux/nfs_fs.h | 3 | ||||
| -rw-r--r-- | include/linux/nfs_xdr.h | 8 |
3 files changed, 19 insertions, 1 deletions
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h index d87be1f25273..9015bb6dc2f2 100644 --- a/include/linux/nfs4.h +++ b/include/linux/nfs4.h @@ -517,6 +517,14 @@ enum { }; /* + * Symbol name and value are from draft-ietf-nfsv4-uncacheable-files + * Section 7. "XDR for Uncacheable Attribute" + */ +enum { + FATTR4_UNCACHEABLE_FILE_DATA = 87, +}; + +/* * The following internal definitions enable processing the above * attribute bits within 32-bit word boundaries. */ @@ -602,6 +610,7 @@ enum { #define FATTR4_WORD2_ACL_TRUEFORM_SCOPE BIT(FATTR4_ACL_TRUEFORM_SCOPE - 64) #define FATTR4_WORD2_POSIX_DEFAULT_ACL BIT(FATTR4_POSIX_DEFAULT_ACL - 64) #define FATTR4_WORD2_POSIX_ACCESS_ACL BIT(FATTR4_POSIX_ACCESS_ACL - 64) +#define FATTR4_WORD2_UNCACHEABLE_FILE_DATA BIT(FATTR4_UNCACHEABLE_FILE_DATA - 64) /* MDS threshold bitmap bits */ #define THRESHOLD_RD (1UL << 0) diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h index ec17e602c979..8552a0d778d9 100644 --- a/include/linux/nfs_fs.h +++ b/include/linux/nfs_fs.h @@ -162,6 +162,8 @@ struct nfs_inode { struct timespec64 btime; + bool uncacheable_file_data : 1; + /* * read_cache_jiffies is when we started read-caching this inode. * attrtimeo is for how long the cached information is assumed @@ -319,6 +321,7 @@ struct nfs4_copy_state { #define NFS_INO_INVALID_NLINK BIT(16) /* cached nlinks is invalid */ #define NFS_INO_INVALID_MODE BIT(17) /* cached mode is invalid */ #define NFS_INO_INVALID_BTIME BIT(18) /* cached btime is invalid */ +#define NFS_INO_INVALID_UNCACHEABLE_FILE_DATA BIT(19) /* cached uncacheable_file_data is invalid */ #define NFS_INO_INVALID_ATTR (NFS_INO_INVALID_CHANGE \ | NFS_INO_INVALID_CTIME \ diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index 11c5b31cfc7d..2e1987ac403d 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -17,6 +17,9 @@ #define NFS_BITMASK_SZ 3 +/* aux_flags in nfs_fattr */ +#define NFS_AUX_UNCACHEABLE_FILE_DATA BIT(0) + struct nfs4_string { unsigned int len; char *data; @@ -68,6 +71,7 @@ struct nfs_fattr { struct timespec64 mtime; struct timespec64 ctime; struct timespec64 btime; + __u32 aux_flags; /* NFSv4 auxiliary flags bitfield */ __u64 change_attr; /* NFSv4 change attribute */ __u64 pre_change_attr;/* pre-op NFSv4 change attribute */ __u64 pre_size; /* pre_op_attr.size */ @@ -108,6 +112,7 @@ struct nfs_fattr { #define NFS_ATTR_FATTR_GROUP_NAME BIT_ULL(24) #define NFS_ATTR_FATTR_V4_SECURITY_LABEL BIT_ULL(25) #define NFS_ATTR_FATTR_BTIME BIT_ULL(26) +#define NFS_ATTR_FATTR_UNCACHEABLE_FILE_DATA BIT_ULL(27) #define NFS_ATTR_FATTR (NFS_ATTR_FATTR_TYPE \ | NFS_ATTR_FATTR_MODE \ @@ -129,7 +134,8 @@ struct nfs_fattr { #define NFS_ATTR_FATTR_V4 (NFS_ATTR_FATTR \ | NFS_ATTR_FATTR_SPACE_USED \ | NFS_ATTR_FATTR_BTIME \ - | NFS_ATTR_FATTR_V4_SECURITY_LABEL) + | NFS_ATTR_FATTR_V4_SECURITY_LABEL \ + | NFS_ATTR_FATTR_UNCACHEABLE_FILE_DATA) /* * Maximal number of supported layout drivers. |