diff options
Diffstat (limited to 'fs/nfsd/nfsfh.h')
| -rw-r--r-- | fs/nfsd/nfsfh.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h index 1cf979722521..5ef7191f8ad8 100644 --- a/fs/nfsd/nfsfh.h +++ b/fs/nfsd/nfsfh.h @@ -14,6 +14,8 @@ #include <linux/exportfs.h> #include <linux/nfs4.h> +#include "export.h" + /* * The file handle starts with a sequence of four-byte words. * The first word contains a version number (1) and three descriptor bytes @@ -220,6 +222,7 @@ extern char * SVCFH_fmt(struct svc_fh *fhp); __be32 fh_verify(struct svc_rqst *, struct svc_fh *, umode_t, int); __be32 fh_verify_local(struct net *, struct svc_cred *, struct auth_domain *, struct svc_fh *, umode_t, int); +__be32 fh_getattr(const struct svc_fh *fhp, struct kstat *stat); __be32 fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *); __be32 fh_update(struct svc_fh *); void fh_put(struct svc_fh *); @@ -272,6 +275,41 @@ static inline bool fh_fsid_match(const struct knfsd_fh *fh1, } /** + * fh_want_write - Get write access to an export + * @fhp: File handle of file to be written + * + * Caller must invoke fh_drop_write() when its write operation + * is complete. + * + * Returns 0 if the file handle's export can be written to. Otherwise + * the export is not prepared for updates, and the returned negative + * errno value reflects the reason for the failure. + */ +static inline int fh_want_write(struct svc_fh *fhp) +{ + int ret; + + if (fhp->fh_want_write) + return 0; + ret = mnt_want_write(fhp->fh_export->ex_path.mnt); + if (!ret) + fhp->fh_want_write = true; + return ret; +} + +/** + * fh_drop_write - Release write access on an export + * @fhp: File handle of file on which fh_want_write() was previously called + */ +static inline void fh_drop_write(struct svc_fh *fhp) +{ + if (fhp->fh_want_write) { + fhp->fh_want_write = false; + mnt_drop_write(fhp->fh_export->ex_path.mnt); + } +} + +/** * knfsd_fh_hash - calculate the crc32 hash for the filehandle * @fh - pointer to filehandle * |