From: Bernd Schubert Date: Mon, 19 Mar 2012 02:44:50 +0000 (-0400) Subject: nfsd: vfs_llseek() with 32 or 64 bit offsets (hashes) X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=06effdbb49af5f6c7d20affaec74603914acc768;p=linux-beck.git nfsd: vfs_llseek() with 32 or 64 bit offsets (hashes) Use 32-bit or 64-bit llseek() hashes for directory offsets depending on the NFS version. NFSv2 gets 32-bit hashes only. NOTE: This patch got rather complex as Christoph asked to set the filp->f_mode flag in the open call or immediatly after dentry_open() in nfsd_open() to avoid races. Personally I still do not see a reason for that and in my opinion FMODE_32BITHASH/FMODE_64BITHASH flags could be set nfsd_readdir(), as it follows directly after nfsd_open() without a chance of races. Signed-off-by: Bernd Schubert Signed-off-by: "Theodore Ts'o" Acked-by: J. Bruce Fields --- diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index a6db4cb874d5..7423d712eb8c 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -796,9 +796,15 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, flags, current_cred()); if (IS_ERR(*filp)) host_err = PTR_ERR(*filp); - else + else { host_err = ima_file_check(*filp, may_flags); + if (may_flags & NFSD_MAY_64BIT_COOKIE) + (*filp)->f_mode |= FMODE_64BITHASH; + else + (*filp)->f_mode |= FMODE_32BITHASH; + } + out_nfserr: err = nfserrno(host_err); out: @@ -2022,8 +2028,13 @@ nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, __be32 err; struct file *file; loff_t offset = *offsetp; + int may_flags = NFSD_MAY_READ; + + /* NFSv2 only supports 32 bit cookies */ + if (rqstp->rq_vers > 2) + may_flags |= NFSD_MAY_64BIT_COOKIE; - err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file); + err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); if (err) goto out; diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h index 1dcd238e11a0..ec0611b2b738 100644 --- a/fs/nfsd/vfs.h +++ b/fs/nfsd/vfs.h @@ -27,6 +27,8 @@ #define NFSD_MAY_BYPASS_GSS 0x400 #define NFSD_MAY_READ_IF_EXEC 0x800 +#define NFSD_MAY_64BIT_COOKIE 0x1000 /* 64 bit readdir cookies for >= NFSv3 */ + #define NFSD_MAY_CREATE (NFSD_MAY_EXEC|NFSD_MAY_WRITE) #define NFSD_MAY_REMOVE (NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC)