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author | J. Bruce Fields <bfields@citi.umich.edu> | 2009-04-16 17:33:25 -0400 |
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committer | J. Bruce Fields <bfields@citi.umich.edu> | 2009-04-29 11:35:49 -0400 |
commit | c654b8a9cba6002aad1c01919e4928a79a4a6dcf (patch) | |
tree | fee411bb42ec86e72a9e843529551e559c1f2749 /include/linux/nfsd/nfsfh.h | |
parent | 3352d2c2d0540955a7bbb3421a28330af7f9d79c (diff) | |
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nfsd: support ext4 i_version
ext4 supports a real NFSv4 change attribute, which is bumped whenever
the ctime would be updated, including times when two updates arrive
within a jiffy of each other. (Note that although ext4 has space for
nanosecond-precision ctime, the real resolution is lower: it actually
uses jiffies as the time-source.) This ensures clients will invalidate
their caches when they need to.
There is some fear that keeping the i_version up-to-date could have
performance drawbacks, so for now it's turned on only by a mount option.
We hope to do something better eventually.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Cc: Theodore Tso <tytso@mit.edu>
Diffstat (limited to 'include/linux/nfsd/nfsfh.h')
-rw-r--r-- | include/linux/nfsd/nfsfh.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/nfsd/nfsfh.h b/include/linux/nfsd/nfsfh.h index afa1901..8f641c9 100644 --- a/include/linux/nfsd/nfsfh.h +++ b/include/linux/nfsd/nfsfh.h @@ -151,9 +151,15 @@ typedef struct svc_fh { __u64 fh_pre_size; /* size before operation */ struct timespec fh_pre_mtime; /* mtime before oper */ struct timespec fh_pre_ctime; /* ctime before oper */ + /* + * pre-op nfsv4 change attr: note must check IS_I_VERSION(inode) + * to find out if it is valid. + */ + u64 fh_pre_change; /* Post-op attributes saved in fh_unlock */ struct kstat fh_post_attr; /* full attrs after operation */ + u64 fh_post_change; /* nfsv4 change; see above */ #endif /* CONFIG_NFSD_V3 */ } svc_fh; @@ -298,6 +304,7 @@ fill_pre_wcc(struct svc_fh *fhp) fhp->fh_pre_mtime = inode->i_mtime; fhp->fh_pre_ctime = inode->i_ctime; fhp->fh_pre_size = inode->i_size; + fhp->fh_pre_change = inode->i_version; fhp->fh_pre_saved = 1; } } |