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add get_name implementation for exports. (#16833)

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This fixes a serious performance problem with NFS handling of large
directories, as the new get_name code is much more efficient than the
default zfs_readdir. This is actually part of
20232ecfaa in 2.3. But I've taken only
the minimum code to implement get_name, and not the rest of the long
name changes.

Signed-off-by: Charles Hedrick <hedrick@rutgers.edu>
Co-authored-by: Charles L. Hedrick <hedrick@ncommunis.cs.rutgers.edu>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
This commit is contained in:
Charles Hedrick
2024-12-04 17:01:57 -05:00
committed by Tony Hutter
parent 299da6ace3
commit 0bd8481aa7
3 changed files with 75 additions and 0 deletions
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include/os/linux/zfs/sys/zfs_vnops_os.h
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@@ -44,6 +44,7 @@ extern int zfs_write_simple(znode_t *zp, const void *data, size_t len,
loff_t pos, size_t *resid);
extern int zfs_lookup(znode_t *dzp, char *nm, znode_t **zpp, int flags,
cred_t *cr, int *direntflags, pathname_t *realpnp);
extern int zfs_get_name(znode_t *dzp, char *name, znode_t *zp);
extern int zfs_create(znode_t *dzp, char *name, vattr_t *vap, int excl,
int mode, znode_t **zpp, cred_t *cr, int flag, vsecattr_t *vsecp,
zidmap_t *mnt_ns);