nfsd: use vfs_fsync_range(), not O_SYNC, for stable writes
NFSv4 shares the same struct file across multiple writes. (And we'd like NFSv2 and NFSv3 to do that as well some day.) So setting O_SYNC on the struct file as a way to request a synchronous write doesn't work. Instead, do a vfs_fsync_range() in that case. Reported-by: Peter Staubach <pstaubach@exagrid.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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@ -1024,11 +1024,6 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
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if (!EX_ISSYNC(exp))
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stable = 0;
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if (stable && !use_wgather) {
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spin_lock(&file->f_lock);
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file->f_flags |= O_SYNC;
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spin_unlock(&file->f_lock);
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}
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/* Write the data. */
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oldfs = get_fs(); set_fs(KERNEL_DS);
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@ -1044,8 +1039,12 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
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if (inode->i_mode & (S_ISUID | S_ISGID))
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kill_suid(dentry);
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if (stable && use_wgather)
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if (stable) {
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if (use_wgather)
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host_err = wait_for_concurrent_writes(file);
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else
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host_err = vfs_fsync_range(file, offset, offset+*cnt, 0);
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}
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out_nfserr:
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dprintk("nfsd: write complete host_err=%d\n", host_err);
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